Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02798631 2014-06-13
1
Autonomous Rechargeable Heated Child's Mat
The invention provides an autonomous rechargeable heated
child's mat as defined by claim 1.
Currently, to keep a child warm in a pushchair, buggy or pram (or
similar conveyance) the child must be dressed in a number of
clothing layers and wrapped in blankets or placed in a sleeping
bag. These methods of keeping a child warm are somewhat
primitive and are not always practical or efficient. The child has to
be partially undressed if they are taken from an extremely cold
environment (outside on a winter's day) to a suddenly warm
environment like the inside of a large shop or store. The child may
be sleeping and the process of removing some clothes often
disturbs them and / or wakes them. In summation the present
system is not only ineffective, but often troublesome for both the
child and the adult looking after the infant.
In an attempt to overcome some of the above limitations, the
present invention offers a complete mobile autonomous
rechargeable heating solution. The Autonomous Rechargeable
Heated Child's Mat is totally portable and forms an integrated yet
detachable part of the child's pushchair, buggy or pram (or similar
conveyance). Rechargeable power cells power the system with a
life expectancy in excess of eight years. The system is fully
controllable from the parent / operator's mobile telephone or tablet
device via wireless communication. Simply seat or lay the child in
the pushchair or buggy (or similar conveyance) as normal. Using a
dedicated application on the mobile device the child will quickly
and safely be warmed to a safe and controlled temperature as set
by the parent / operator. The system will continue to control and
monitor heat levels without any further intervention. The system
automatically detects if the child is taken into a warmer
environment, such as inside a warm shop and instantly the system
will reduce it's heating output to maintain a safe and comfortable
temperature as set. The longest of excursions and shopping trips
can now be made with the child in complete comfort and warmth.
The system automatically reports any problems or anomalies in
CA 02798631 2014-06-13
2
real time should they occur. A powerful and intelligent heating
system that is simple to operate and control with simplicity.
The present invention is controlled wirelessly either from the
parent's / operator's mobile telephone or laptop/pc/tablet/iPad via
WiFi or Bluetooth connection using either a web browser or the
specifically written control application (Mobile App.) The parent /
operator does not have the extra weight and inconvenience of
using a separate device to control the heating output of the
invention; the mobile telephone or laptop/pc/tablet/iPad can be
utilised, which is often being carried anyway and thus avoids extra
weight and complications.
The following description details a number of embodiments of the
invention.
The invention offers a fully monitored redundancy system that
makes it distinctly suitable for medical and normal use. The
automatic redundancy system ensures that if the autonomous
rechargeable heated child's mat system experiences a partial
heating system failure, it will attempt to increase its remaining
functioning system's outputs in order ensure that child continues to
remain warm in all conditions. The system will continue to monitor
the current problem and monitor for further anomalies and make
adjustments as necessary in real time without the intervention of
the parent / operator. The parent / operator will be advised of any
problems using the bi-directional wireless communication system
that is embedded within the invention (Power Pack Controller
Module). The parent / operator will be notified either on his or her
mobile telephone or on laptop/pc/tablet/iPad , whichever device is
currently being used to control the system.
The invention offers the ability to control heating output in an
almost continuously variable manner from less than 1% heating
level all the way through to 100% heating. The parent / operator
can also control heating levels in a regional manner, thus if he or
she wishes more heat output on the leg's region of the heated mat,
then output can be increased in this region specifically whilst
maintaining lower heating levels to child's head and main body
region. The system also ensures, if required, that a virtually
balanced output throughout all the regions can be produced. The
CA 02798631 2014-06-13
3
embedded electronic controller monitors and drives the different
heating regions individually to ensure a complete uniformity of heat
throughout the autonomous rechargeable heated mat. The
invention monitors heating levels and outputs throughout the
autonomous rechargeable heated mat with a plurality of embedded
digital temperature sensors that are interfaced to the
Microcontroller.
An example of the invention will now be described by referring to
the accompanying drawings:
Figure 1 shows the basic structure of the autonomous,
rechargeable heated child's mat 1. The components shown in the
figure will be fully detailed in the description that follows. The
figure shows the integrated digital temperature sensors 15, 16, 13,
4, 11 and 9. The base material of the autonomous, rechargeable
heated child's mat 1 can be produced from a semi-pliable felt type
fabric or similar material with the same basic properties. The
Primary and Secondary heating channels within the distinct
regions can be seen. The head region is heated by Primary
heating channel 2 and the Seconday heating channel 3. The main
body region is heated by the Primary heating channel 5 and the
Seconday heating channel 6. The leg region is heated by the
Primary heating channel 7 and Secondary heating channel 8. The
rectangular opening slots 14, 17 and 12 for the seat belt fastenings
can clearly be identified on the base material. The slots edges are
machine overlocked to avoid fraying. The cut-out shape 10 is to
allow the base material to fit around the lower seatbelt fastening, if
one is present in the particular embodiment that it is fitted within.
Figure 2 shows an enlarged view of the head and top section of
the main body region of the heated mat structure. The two digital
temperature sensors located in the head region 15 and 16 can
clearly be seen. The rectangular cut-outs for the upper seatbelt
fastenings 14 and 17 can also be seen located to the sides of the
digital temperature sensors 15 and 16. The Primary 2 and
Secondary 3 head region heating channels are also clearly
identifiable in this enlarged figure. The top half of the Primary 5
and Secondary 6 main body heating channels can also be clearly
CA 02798631 2014-06-13
4
seen. One of the digital temperature sensors 4 for the main body
section can also be seen.
Figure 3 shows the enlarged view of the leg heating region and
lower middle section of the main body section. The lower portion
of the Primary 5 and Secondary 6 heating channels of the main
body section can also be clearly identified. The lower main body
section digital temperature sensor 13 can also be seen. The
Primary 7 and Secondary 8 heating channels of the leg section can
also be clearly identified. The lower rectangular cut out for the
seat belt fastening 12 can also be seen. The digital temperature
sensors 9 and 11 located in the leg region can be seen. The lower
seatbelt fastening cut out shape 10 can also be seen.
Figure 4 clearly depicts visually the main heating regions. The
figure clearly shows the head, main body and legs region which
can each be individually controlled by the parent / operator. The
figure also shows the seat belt cutouts 14, 17 and 12. The six
digital temperature sensors 15, 16, 13, 4, 11 and 9 are also clearly
visible within each of the separate regions. The head region is
controlled by temperature sensors 15 and 16. The main body
section being controlled by sensors 13 and 4. The leg region
being controlled by sensors 11 and 9. The cut-out shape 10 is to
allow the base material to fit around the lower seatbelt fastening, if
one is present in the particular embodiment that it is fitted within.
Figure 5 shows the main components of the system. The Power
Pack Controller Module 20 contains the power source (Prismatic or
Cylindrical Cells pack), the Microcontroller with Wireless interface
board and MOSFET Heating Circuit Controller which drives the
heating channels. The Power Pack Controller Module 20, is
connected to the Regionalised Heating Mat with Regionalised
Digital Temperature Sensors 1, via a Power Transfer Lead with
Embedded Digital Temperature Sensor 21. The figure identifies
the communication and power links between the three separate
components of the system.
Figure 6 shows the Power Pack Controller Module 20. This sealed
unit is rated to IP68. The size of the unit in one particular
CA 02798631 2014-06-13
embodiment is approximately eleven (11) inches (28cm) long (L)
by nine (9) inches (23cm) wide (W) by three (3) inches (8cm) in
height (H). Alternative sizes of the unit will be dependant upon the
power capacity of the Prismatic or Cylindrical cell packs encased
within the unit. The front of the Power Pack Controller Module 20
has a 'Master Power Button' this is used as a main switch to
completely isolate the unit and turn off all outputs. A 'Power
Transfer Lead Socket' is also positioned on the front of the unit,
this is used to connect the 'Power Transfer Lead with Embedded
Digital Temperature Sensor' 21. An alternative embodiment of this
Power Pack Controller Module 20 may have a plurality of power
transfer lead sockets so as to power two or more Regionalised
Heating Mats 1 from one Power Pack Controller Module 20, such
as in the case of a twin buggy or two car seats positioned adjacent
to each other. The last connector socket on the front of the unit is
a 'Charging Socket' for connecting it to either a mains voltage
charger (110/120V - 220/240V) or a vehicle charger (12V ¨ 24V)
for charging whilst mobile.
Figure 7 shows the Power Transfer Lead with Embedded Digital
Temperature Sensor 21. This lead connects at one end to the
Power Pack Controller Module 20 and at the other end to the
Regionalised Heating Mat with Regionalised Digital Temperature
Sensors 1.
Figure 8 depicts one possible embodiment of the Regionalised
Heating Mat with Regionalised Digital Temperature Sensors 1
within a child's pushchair 22 (stroller / buggy / carriage). The
Regionalised Heating Mat with Regionalised Digital Temperature
Sensors 1, is positioned on the seat. The mat would be covered
with a suitable shaped fabric covering. The Power Pack Controller
Module 20 is located under the seat on the lower shelf area. The
Power Pack Controller Module 20 is connected to the Regionalised
Heating Mat with Regionalised Digital Temperature Sensors 1, via
the Power Transfer Lead with Embedded Digital Temperature
Sensor 21, this would be held in position with Velcro straps or
similar fastening device positioned around the frame of the
pushchair.
Figure 9 depicts an alternative embodiment of the Regionalised
Heating Mat with Regionalised Digital Temperature Sensors 1
CA 02798631 2014-06-13
6
within a child's car seat 23. The Regionalised Heating Mat 1, is
positioned on the seat. The mat would be covered with a suitable
shaped fabric covering. The Power Pack Controller Module 20 is
located under the frame of the seat and held in position with
Velcro straps or similar fastening device. The Power Pack
Controller Module 20 is connected to the Regionalised Heating Mat
1, via the Power Transfer Lead with Embedded Digital
Temperature Sensor 21, this would be held in position with Velcro
straps or similar fastening device positioned around the car seat's
frame.
Figure 10 depicts a further alternative embodiment of the
Regionalised Heating Mat with Regionalised Digital Temperature
Sensors 1 within a pram 24. The Regionalised Heating Mat 1, is
positioned on the pram. The Heating Mat would be covered with a
suitable shaped fabric covering. The Power Pack Controller
Module 20 is located under the frame of the pram and held in
position with Velcro straps on a shelf. The Power Pack / Controller
Module 20 is connected to the Regionalised Heating Mat 1, via the
Power Transfer Lead with Embedded Digital Temperature Sensor
21, this would be held in position with Velcro straps or similar
fastening device positioned around the pram's frame.
Figure 11 depicts the components of the system that drive the
Primary and Secondary heating channels in Head Region of the
autonomous Regionalised Heating Mat. The components detailed
in figure 11 are Regional Temperature Sensors for the three
regions, Head, Main Body and Legs as follows (Head Region - 15 /
16), (Main Body Region ¨ 13 / 4) and (Legs Region ¨ 11 / 9)
respectively. The temperature sensors information is relayed into
the Microcontroller via a "1-Wire" digital interface. The
Microcontroller outputs in this embodiment two PWM (Pulse Width
Modulation) control signals. The PWM signals feed the individual
gates of the Embedded MOSFETs, depicted in the figure as
"MOSFET HEATING CIRCUIT CONTROLLER" (EMHCC). The
EMHCC drives the Primary and Secondary heating channels of
each of the three regions individually. Figure 11 shows three
separate regions being monitored by two digital temperature
sensors in each region (total 6 heating sensors in this particular
embodiment depicted). The Embedded Microcontroller then
outputs two individually generated PWM signals 31 and 32 for
CA 02798631 2014-06-13
7
each of the regions. The figure shows that the Primary Heating
Channel in Head Region is being driven with an 50% (fifty) duty-
cycle 32 and that the Secondary Heating Channel in the same
region (Head) is being driven with a 50% (fifty) duty-cycle 31;
these two signals are then fed directly into the EMHCC. The
Primary Heating Channel 2 and Secondary Heating Channel 3 are
driven by the Primary and Secondary Channel Outputs 32 and 31
respectively of the EMHCC. The EMHCC in this embodiment has
a further two inputs and outputs pairs (heating channel pairs) for
the legs region and the main body region which in this figure are
not depicted as being connected. The output of the head region
with a 50% duty-cycle on both the Primary 32 and Secondary 31
channel outputs would be approximately 12 (twelve) Watts total
heating output.
Figure 12 depicts the same components as figure 11 detailed
above. However, in this representation it can be seen that the
PWM signals of the Primary 34 and Secondary 33 heating
channels are different. The Primary PWM signal is outputting a 0%
duty-cycle (zero output) and the Secondary PWM signal is
outputting a 100% duty-cycle signal (on full-time). The
approximate combined (Primary and Secondary heating channels)
heating output is 12 (twelve) Watts of heating output for the head
region. The output at 12 Watts is virtually identical to that of figure
11 with a PWM signal of 50% duty-cycle each on the Primary 32
and Secondary 31 heating channels respectively for the head
region. This virtually identical heating output demonstrate the
possible scenario of a complete failure of Primary Heating Channel
and thus the Secondary Heating Channel being driven at an
increased duty-cycle in an attempt to re-establish the desired
heating output as it was prior to the failure of the Primary Heating
Channel. A detailed discussion of this redundancy control system
will be given further in the main description that follows.
Figure 13 shows a complete system chart from the digital regional
temperature sensors for the three separate regions; each separate
region having two digital temperature sensors within it. The
temperature sensor information is fed into the embedded wireless
microcontroller. The operating code (firmware) in the
microcontroller generates the PWM (Pulse Width Modulation)
output subject to the operating settings input by the parent /
CA 02798631 2014-06-13
8
operator, via the wireless link to the mobile telephone 41 or
laptop/pc/tablet/iPad 43 and the temperature information received
from the regional digital sensors, including ambient temperature
from the Power Transfer Lead with Embedded Digital Temperature
Sensor 21. The PWM signals are then fed into the Embedded
MOSFET Heating Circuit Controller, which directly drives the
Primary and Secondary Heating channels of each of the three
separate regions. The figure depicts the legs region being driven.
The digital temperature sensors 8 and 9 information is fed into the
embedded microcontroller, this produces two PWM driving signals
36 and 35, Primary and Secondary respectively. The PWM
signals are then fed into the Embedded MOSFET Heating Circuit
Controller (EMHCC) for the legs region 38 and 37. The Embedded
MOSFET Heating Circuit Controller then drives the Primary 40 and
Secondary 39 heating channels for the legs region. Figure 13 for
clarity only depicts the legs region being driven, however the main
body and the head region are driven in exactly the same manner,
with the respective sensors and PWM signals for each of the
remaining two regions.
Figure 14 shows a graph accurately plotted with the temperature
rise of the main body region of the Autonomous Rechargeable
Heated Child's Mat fitted to a child's pushchair. The graph
indicates the temperature rise and fall over a period of time in
minutes from zero (0) to seventy-five (75). The two traces on the
graph depict both the operating temperature and the ambient
temperature in degrees C. The ambient temperature remained at
around 2.5 degrees C during the operational period of seventy-five
minutes. The system was set at full power for the initial thirty-five
(35) minutes. The heating level was then adjusted to
approximately 20 degrees for the remaining period shown on the
graph.
Figure 15 is a graphical representation of the bidirectional
communication via WiFi / Bluetooth that occurs between the
Power Pack Controller Module 20 of the Autonomous
Rechargeable Heated Child's Mat and the controlling device. The
microcontroller with wireless module communicates in a
bidirectional manner with a mobile telephone 41, wireless router 42
or a laptop 43 (computer/tablet/iPad ) to monitor and control the
heat distribution and output level (wattage) of the Autonomous
CA 02798631 2014-06-13
9
Rechargeable Heated Child's Mat. The bidirectional wireless
communication between the Mat and the various wireless
controlling devices, mobile 41, router 42 and laptop 43
(computer/tablet/iPad ) allows the system to report any errors or
anomalies to the parent / operator. The system can also
communicate additional information such as battery level status
and varying ambient temperature, particularly important if the
ambient temperature is falling to around 0 degrees C (freezing).
Figure 16 is a drawing showing the Prismatic Lithium Ion Pouch
Cell 44, which in one embodiment of the Autonomous
Rechargeable Heated Child's Mat is located within the Power Pack
Controller Module 20. The output terminal tabs (Anode and
Cathode) 45 and 46 are clearly identifiable on one of the shorter
sides of the pouch. The width (W) of the pouch, length (L) and
height (H) will vary in direct proportion to the cell's output capacity
(Ah). One particular useable embodiment would be 120mm (L) by
60mm (W) by lOmm (H) (4.7 inches by 2.4 inches by 0.4 inches
respectively), having a rated output capacity of 6.3 Ah (6300mAh).
A plurality of varying cell (Prismatic Lithium Ion Pouch) sizes could
be implement subject to a number of specific requirements and
constraints including rated cell power (Ah), running time required,
heating output required relative to normal ambient temperature
(total combined channel wattage) and space availability amongst a
number of other variable factors which may need to be considered.
Figure 17 shows an alternative possible method of embedding
Lithium Ion Cells (or similar chemistry cells) within the Autonomous
Rechargeable Heated Child's Mat. The figure shows one possible
design for an ABS (or similar type material) battery cell casing 47
with separate top 49 produced in ABS (or similar type material)
and sealed onto the main cell casing 47 with suitable sealant being
used around the lower lip 50 of the casing top 49. An alternative
material could be used to produce the battery cell case, with
similar properties to ABS. The casing top has a suitably sized
(diameter) exit hole 51 for the power leads to exit the sealed
battery casing. The battery cell casing 47 has rounded edges to
minimise wasted space associated with the use of cylindrical cells.
A representation of wasted space associated with cylindrical cells
is depicted graphically 56. A number of different cylindrical cells
with varying diameters 53 and lengths 52 could be implemented
CA 02798631 2014-06-13
subject once again, to a number of different factors, similar to
those already discussed in the description of figure 16 above. One
possible Lithium Ion cell chemistry embodiment (LiFePO4) 52, can
be seen with a height (H) and a diameter (D). The diameter of the
cell would be nominally smaller than the width of the ABS casing's
(or similar material) internal wall dimension 48 so that the cells fit
tightly into the casing and allow for some expansion during
charging and any exothermic reaction, which may occur during
high current drain situations such as full heat output of the
Autonomous Rechargeable Heated Child's Mat. An alternative
smaller length (H2) and diameter (D2) cylindrical cell 54 is shown.
This smaller cell size would be suitable in an embodiment which
required reduced running time or lower heating output (Wattage).
The output voltage of the cell would be the same as the larger cell
52, but the Ah (amp/hour) capacity of the cell would be reduced in
proportion to its reduction in size and volume (H2 andD2). The
cells shown in figures 16 and 17 are of Lithium Ion type chemistry,
a plurality of other cell chemistry compositions exists such as
Nanophosphate Lithium Ion, Ext Nanophosphate Lithium Ion,
Nickel Cadmium, Nickel-metal Hydride, Lithium Ion, Lithium Ion
Polymer and Lithium Iron Phosphate, amongst a variety of other
known chemistry types. These alternative cell type compositions
exist in a variety of formats such as prismatic pouches and
cylindrical cell formats. The ABS casing (or similar material) 47
allows for any one of these types of chemistry to be used in any
one specific embodiment of the Autonomous Rechargeable
Heated Child's Mat.
The invention relates to a mobile Autonomous Rechargeable
Heated Child's Mat, which can be incorporated into virtually any
form of child's pushchair, pram, buggy, stroller, carriage or similar
child's conveyance. The following paragraphs give a detailed
description of a number of possible embodiments for this invention,
its design, construction and its manner of operation. The
extremely flexible nature of this invention allows for a considerable
number of possible embodiments; the embodiments shown in the
figures and discussed herein are only a small representation of the
immense number of possible wide ranging embodiments, and thus
should not be considered to be exhaustive in any manner.
CA 02798631 2014-06-13
11
The Autonomous Rechargeable Heated Child's Mat will for the
remainder of this description be referred to as the ARHCM.
Detailed Description
The ARHCM has its own dedicated embedded power source; in
the particular embodiments depicted in the figures, the embedded
power source may consists of a plurality of Lithium Ion Prismatic
Pouch Cells 44 or alternatively a plurality of cylindrical power cells
(52, 54) with a similar chemistry base. The cylindrical cells would
be encased in a sealed slim-line case 47 made from ABS material
or similar material; this cell type is depicted in figure 17. A plurality
of Prismatic Pouch Cells 44 or cylindrical encased power cells (52,
54) can be incorporated dependant upon the required output
(heating) wattage of the ARHCM and the associated desired
running time for said output (heating) wattage. The prismatic
power cells and alternative cylindrical cells are not parent /
operator serviceable, and are actually completely embedded
(sealed) within the construction of the Power Pack Controller
Module 20. The user does not see or come into contact with the
Lithium Ion Prismatic Pouch Cells 44 or alternative cylindrical cells
(52,54) at any time as they are embedded within the sealed Power
Pack Controller Module 20. The user is never required to
manipulate or service these power cells in any way. The prismatic
and cylindrical cells have a charging life cycle (number of separate
charges) in excess of 3200 charges, whilst still maintaining an 88%
initial capacity charge state. The charging life cycle allows for a
minimum life expectancy in excess of eight (8) years with normal
to high usage levels on a regular daily basis. An experienced
electronic engineer, if so required could replace the power cells,
although given the long charging life cycle this is an unlikely
scenario. The cells are re-charged using the 'Charging Socket' as
shown in figure 6. A mains voltage charger (110/120V - 220/240V)
or a vehicle charger (12V ¨ 24V) can be used to re-charge the
cells. The cells can be fully charged in approximately 3 to 6 hours
depending upon the remaining capacity in the cells prior to
charging. The standard capacity, Amp hour (Ah) of the cells in the
particular embodiment will also have an effect on charging time.
An embodiment with higher capacity cells will take longer to re-
CA 02798631 2014-06-13
12
charge from the same depletion level than cells of a lower Ah
capacity.
One embodiment sees the use of Nanophosphate Lithium Ion
Prismatic Pouch Cells as depicted in figure 16. An alternative
embodiment would be with the use of standard Lithium Ion
Prismatic Pouch cells or cylindrical Lithium Ion cells (52 and 54)
encased in a sealed slim-line case 47 made from ABS material (or
similar type material) as depicted in figure 17. The operating
temperature range of the Nanophosphate Lithium Ion Prismatic
Pouch Cells is within the region of -30 degrees Celsius to +55
degrees Celsius. A possible alternative chemistry Prismatic
Lithium Ion Pouch Cell that may be used is a "EXT Nanophosphate
Lithium Ion" which handles extreme temperatures on both ends of
the scale better, and thus has a better overall operating
temperature range and performance. This "EXT" type cell could be
implemented for use in extreme cold weather environments. The
use of "EXT" type cell chemistry would improve both the voltage
and current output, thus producing more heating output (wattage)
and operate for a longer period of time between recharging cycles
in colder operating conditions. The enhanced characteristics of
"EXT" type cell chemistry offers around a 20% increase in power
output over standard chemistry Nanophosphate Lithium Ion cells at
the extremes of operating temperatures.
The particular battery type and Ah rating chosen would be based
on the average ambient temperature that the ARHCM would be
required to operated within. The use of Ext Nanophosphate
Lithium Ion chemistry would be particularly beneficial in countries
with extremely severe weather, with temperatures dropping below
0 degrees C on a regular basis such as Canada.
The ARHCM contains a plurality of low power digital temperature
sensors such as Dallas DS18620 with the unique "1-Wire"
interface which are embedded, and thus fixed to the base material
of the Regionalised Heating Mat 1. The plurality of sensors are
capable of individually reporting (communicating) with the
microcontroller (within the Power Pack Controller Module 20) with
an accuracy of + or ¨ 0.5 degree Celsius for each of the measured
regions. The sensors have a temperature measuring range of -55
degree Celsius to +125 degree Celsius. The particular
CA 02798631 2014-06-13
13
embodiment shown in the figures depicts six Dallas DS18620
digital temperature sensors being used to report directly back to
the Microcontroller via a "1-Wire" digital interface. The sensors are
configured to obtain power via the data input/output pin in
"Parasite" mode so as to avoid running additional power feeds to
the individual sensors. Alternative digital temperature sensors
such Texas Instruments TMP102 with "SMBusTm/Two-Wire" Serial
Interface, could be implemented in place of the aforementioned
Dallas DS18B20 digital sensors. A variety of other digital
temperature sensors could be implemented if required. The
fundamental purpose of whichever type of digital temperature
sensor is implemented is to accurately report (communicate) with
the microcontroller the temperature in the specific region being
measured. The embodiment depicted in the figures demonstrates
the use of six digital temperature sensors within three distinct
regions, the head, main body and legs region as depicted in figure
4. A smaller or larger plurality of sensors and regions may be
used dependant upon the particular embodiment and the desired
level of accuracy and functionality required.
The Microcontroller in the Power Pack Controller Module 20
monitors the temperature from each regional sensors (15, 16, 13,
4, 11 and 9) approximately once every second. The sensors each
have a unique serial number that is used to identify the particular
regional sensor when the temperature data is read via the "1-Wire"
serial interface into the Microcontroller. This enables the
Microcontroller to adjust the individual output levels to the
MOSFETs in order to automatically regulate the heating channels
in such a manner to accurately establish the temperature as set by
the parent / operator on the mobile telephone 41,
laptop/pc/tablet/iPad 43 or remotely via an operator obtaining
access to the ARHCM via the wireless router 42 connected to the
internet (wide area network) or local network as depicted in figure
15. The temperature readings obtained from the plurality of
sensors can be reported back to the parent / operator via the
bidirectional WiFi / Bluetooth Module that is embedded and
interfaced to the Embedded Wireless Microcontroller located within
the Power Pack Controller Module 20. The temperature could then
be displayed either numerically or graphically on the mobile
telephone 41, laptop/pc/tablet/iPad 43 or transmitted via the
wireless router 41 connected to the Internet or local network.
CA 02798631 2014-06-13
14
Accurate measuring and reporting of regional (head, main body
and legs) temperatures throughout the autonomous heated child's
mat, is of paramount importance to control and balance the
temperatures of the system by utilising the received temperature
data to control the Primary and Secondary regional heating
channels within each of the regions individually. The system will
also allow balanced temperatures throughout the plurality of
individual regions. The Microcontroller may also be programmed to
balance the temperatures between the individual regions. The
advanced temperature monitoring and controls enables the
individual regions to be maintained within a tolerance of +/- 1
degree C of each other at all times if required.
The parent / operator can either set a uniform temperature
throughout the regions (head, main body and legs) or set different
temperatures in the regions. The parent / operator may decide to
set the head region at twenty (20) degrees C, whilst setting the
main body and legs region at twenty-four (24) degrees C. The
Microcontroller with the temperature information it receives from
the regional digital temperature sensors (15, 16, 13, 4, 11 and 9) is
able to accurately maintain these temperature differentials. The
particular embodiment with two digital temperature sensors in each
region as shown (15 ¨ 16, 13 ¨ 4, 11 ¨ 9), is able to detect if the
child has removed his / her top blanket covering on one side by a
measured temperature differential. A noted temperature differential
can be reported to the parent / operator via the bidirectional WiFi /
Bluetooth communication link between the Power Pack Controller
Module 20 and the device (mobile 41, router 42, laptop / pc / tablet
/ iPad 43) being used to control the ARHCM. The system offers a
high degree of flexibility in terms of remote heating controllability
and monitoring via the bidirectional WiFi / Bluetooth
communication link. The digital temperature sensors within the
regionalised heated mat 1 and the ambient temperature sensors
ensure a high degree of accuracy, controllability, uniformity and
repeatability. The ambient digital temperature sensor also enables
the system to be able to quickly detect if the system has been
taken into a warmer environment and thus it will need to quickly
adjust the heating channel outputs in order to maintain its set
temperatures; without exceeding its set temperatures due to the
quick rise in ambient temperature. The system continues to
monitor all set temperatures and ambient temperatures so that if
CA 02798631 2014-06-13
the ambient temperature suddenly drops again quickly, the heating
channel outputs can be quickly increased to compensate as
necessary. The rise and then subsequent fall in detected ambient
temperature would occur if the ARHCM was taken from outside in
cold weather into a warm shop and then taken back out again of
the warm shop. The digital temperature monitoring system is able
to detect and respond quickly to changes like the shop example
given above. The ambient digital temperature sensor can detect
changes in ambient temperature within a time period of only two or
three seconds, and report this to the Microcontroller located within
the Power Pack Controller Module.
The Power Pack Controller Module 20 has an embedded 8-Bit Low
Power Microcontroller within its structure. Alternative
Microcontrollers such as 4-Bit and 16-Bit could be implemented if
required. The Microcontroller incorporates on-board system
memory that contains custom written code for the precise control
and monitoring of the heating system. The Microcontroller is
interfaced to a WiFi / Bluetooth controller module via an UART
interface or alternative interface such as 12C (Wire) or a plurality
of other types of available interfaces available on the embedded
Microcontroller. The WiFi module is a complete ultra low power
embedded TCP/IP solution. The module offers stand alone
embedded wireless 802.11 b/g/n networking. The module
incorporates its own 2.4 GHz radio, processor,TCP/IP stack, real-
time clock and UART (Universal Asynchronous Receiver
Transmitter) interface. The WiFi / Bluetooth module allows the
ARHCM to be controlled from any device having a wireless
connection and web browser or appropriate operating system with
suitable Application (App with Serial data connection or similar
communication protocol). A mobile phone 41 with WiFi or a
Laptop (computer/tablet/iPad ) 43 with WiFi can easily be used to
operate the ARHCM with ease. The wireless router 42, which may
be connected to the Internet will allow for a remote operator to
monitor, configure and operate the ARHCM from a remote location
(WAN) or a local location via a local area network (LAN).
The router 42 connections, either locally (LAN - Local Area
Network) or via the internet remotely (WAN ¨ Wide Area Network)
will allow the system a large degree of control flexibility. The
system could if situated within the proximity of a router 42
CA 02798631 2014-06-13
,
16
,
connected to the internet (WAN) allow the parent / operator to
review and control the system from a remote location via an
internet connected mobile telephone 40 using either a dedicated
Application (App) or a Web browser. The parent / operator from a
remote location, such as a restaurant or friend's house could
monitor and control the child's temperature all with the simple click
of a button on his/her mobile telephone 41 or laptop/pc/tablet/iPad
43. This has a number of potential medical benefits, as the system
could be used within a hospital to monitor and control the
temperature for children with illnesses that require them to be kept
stable at a particular temperature and monitored.
The ARHCM produces a highly consistent and uniform level of
heat output (wattage) throughout the Regionalised Heating Mat 1.
The particular embodiment depicted has a plurality of heating
regions (head, main body and legs) to ensure equal distribution of
heating throughout the regions. The system incorporates both
Primary and Secondary heating channels for each region. The
Microcontroller monitors and controls (cycles) the Primary and
Secondary channels in an automatic manner relative to the
requirements the parent / operator has selected via the wireless
WiFi / Bluetooth controller (possibly mobile telephone 41, remote
operator via wireless internet connected router 42 and/or
laptop/pc/tablet/iPad 43). The desired heat output and hence
level can be chosen and set either by utilising the web browser on
the mobile telephone 41 or laptop / personal computer 43
(including tablet/iPad ) or by the use of a dedicated application on
the mobile 41 or laptop/pc/tablet/iPad 43 as required. The system
is designed to operate currently with both IOS , Android devices
and should be able to be functional with future similar devices that
operate on Wireless and/or Bluetooth protocols using similar
operating systems and platforms.
The embodiment has both Primary and Secondary heating
channels for all the regions. The fundamental purpose of the
Primary and Secondary heating channels is to ensure a complete
redundancy facility should either of the channels fail on a
temporary or permanent basis whilst operating. The Primary and
Secondary channels are individually controlled by separate
MOSFET's that are driven and monitored directly from the
Wireless Microcontroller. The software (firmware) stored in the
CA 02798631 2014-06-13
17
Microcontroller monitors on a regular time basis, approximately
once every second the current level being drawn by each of the
individual heating channels in each of the regions, Primary and
Secondary on an individual basis using a highly accurate "Hall"
effect type sensor, with the output being logged by the
Microcontroller. The Microcontroller immediately reports to the
parent / operator if any one or more heating channels have failed
or it has detected an operating anomaly in the previous operating
period. The reporting of the failure is accomplished through the
WiFr's / Bluetooth 's bidirectional data transfer to the mobile
telephone 41, wireless router 42 or laptop/pc/tablet/i Pad 43 that
the parent / operator is using to control the system. The system is
also programmed to automatically increase the heating output
(duty-cycle) of the remaining channel in the region for which the
other channel has failed in an attempt to maintain the previous
heating output. The following situation demonstrates the above; if
in one of the regions the Secondary channel has failed and prior to
the failure occurring the heating level in that region for both
channels was being controlled at a 50% duty-cycle on each
channel, then the system would automatically increase the duty-
cycle on the remaining channel (Primary) to 100% duty-cycle in
order to obtain a similar level of heating output (wattage). The
system would continue to monitor the failed channel and the
remaining channels so that should the situation change in any way
the Microcontroller can take the appropriate action to attempt to
maintain the set and desired heating level. The Microcontroller
can be considered to be intelligent in the manner in which it
continually monitors and updates the heating duty-cycles of the
regions for both the Primary and Secondary channels. The
Primary and Secondary heating channels are at all times driven
independently of each other to maximise control efficiency. Figures
11 and 12 demonstrate the failure of the Primary Channel and then
the subsequent alteration (increase) of duty-cycle on the remaining
Secondary Channel.
