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(12) Patent Application: | (11) CA 2269346 |
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(54) English Title: | DC ENERGY FLOW DIRECTION CONTROL USING REVERSE BLOCKING DEVICES IN DC-AC INVERTERS |
(54) French Title: | COMMANDE DE LA DIRECTION DU COURANT CONTINU FAISANT APPEL A DES DISPOSITIFS DE BLOCAGE DU COURANT INVERSE DANS DES ONDULEURS |
Status: | Deemed Abandoned and Beyond the Period of Reinstatement - Pending Response to Notice of Disregarded Communication |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | |
(74) Associate agent: | |
(45) Issued: | |
(22) Filed Date: | 1999-04-14 |
(41) Open to Public Inspection: | 2000-10-14 |
Availability of licence: | N/A |
Dedicated to the Public: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | None |
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A DC-AC inverter is defined as an electrical instrument to convert a DC
(direct current) source to
an AC (alternating current) output. In such an instrument, the electric energy
can flow from the
DC source to the AC output, or from the AC output to the DC source. But the
latter energy-flow
direction is not the intentional design direction for the inverter. This
phenomenon exists when the
voltage level at the DC source is lower than the voltage level at the AC
output, for example, when
the inverter is used in the wind energy conversion systems at low wind
conditions, or when the
inverter is used in the photovoltaic solar energy conversion systems at cloudy
time. In such
systems, the AC output is connected to the electric power lines, or the
electric grid as the
technical term used by electric utilities. The energy-flow from the AC to the
DC can cause
substantial reactive power, usually in lagging form, interference with the
electric power delivery,
increasing energy losses and reducing the energy conversion efficiency of the
wind energy
conversion systems or photovoltaic solar energy conversion systems.
In this invention, the electric energy-flow unique direction from the DC to
the AC is secured by
adding a reverse blocking device, for example, a diode in series connection in
between the DC
source and the inverter. By adding such a reverse blocking device, for example
a diode, defined as
the blocking diode, the electric energy-flow is confined only from the DC
source to the AC output
no matter what the DC voltage level is. As a result, the reactive power output
of the inverter and
energy losses are reduced, and the system energy conversion efficiency is
increased. A small
fraction of the previous DC capacitance will be moved to the position after
the reverse blocking
device, or an additional capacitor will be added at the position after the
reverse blocking device to
smooth the inverter current commutation and reduce the voltage tension on the
inverter switching
devices. Other options to reduce the voltage tension may also include a
parallel connected switch
with the reverse blocking device and a voltage varistor.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
2024-08-01:As part of the Next Generation Patents (NGP) transition, the Canadian Patents Database (CPD) now contains a more detailed Event History, which replicates the Event Log of our new back-office solution.
Please note that "Inactive:" events refers to events no longer in use in our new back-office solution.
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Description | Date |
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Inactive: IPC assigned | 2020-04-03 |
Inactive: IPC expired | 2007-01-01 |
Inactive: IPC removed | 2006-12-31 |
Inactive: IPC from MCD | 2006-03-12 |
Inactive: Dead - RFE never made | 2005-04-14 |
Application Not Reinstated by Deadline | 2005-04-14 |
Inactive: Payment - Insufficient fee | 2005-03-10 |
Inactive: Delete abandonment | 2005-03-10 |
Inactive: Payment - Insufficient fee | 2005-03-10 |
Inactive: Adhoc Request Documented | 2005-01-17 |
Inactive: Payment - Insufficient fee | 2004-09-14 |
Inactive: Delete abandonment | 2004-09-14 |
Inactive: Payment - Insufficient fee | 2004-09-01 |
Inactive: Delete abandonment | 2004-09-01 |
Deemed Abandoned - Failure to Respond to Maintenance Fee Notice | 2004-04-14 |
Inactive: Payment - Insufficient fee | 2004-04-14 |
Inactive: Payment - Insufficient fee | 2004-04-14 |
Deemed Abandoned - Failure to Respond to Maintenance Fee Notice | 2004-04-14 |
Inactive: Abandon-RFE+Late fee unpaid-Correspondence sent | 2004-04-14 |
Deemed Abandoned - Failure to Respond to Maintenance Fee Notice | 2004-04-14 |
Inactive: Payment - Insufficient fee | 2004-04-13 |
Request for Examination Received | 2004-03-22 |
Inactive: Adhoc Request Documented | 2003-01-31 |
Application Published (Open to Public Inspection) | 2000-10-14 |
Inactive: Cover page published | 2000-10-13 |
Inactive: First IPC assigned | 1999-06-03 |
Inactive: Office letter | 1999-05-25 |
Inactive: Filing certificate - No RFE (English) | 1999-05-20 |
Application Received - Regular National | 1999-05-19 |
Abandonment Date | Reason | Reinstatement Date |
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2004-04-14 | ||
2004-04-14 | ||
2004-04-14 |
The last payment was received on 2005-04-07
Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following
Patent fees are adjusted on the 1st of January every year. The amounts above are the current amounts if received by December 31 of the current year.
Please refer to the CIPO
Patent Fees
web page to see all current fee amounts.
Fee Type | Anniversary Year | Due Date | Paid Date |
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Application fee - small | 1999-04-14 | ||
MF (application, 3rd anniv.) - small | 03 | 2002-04-15 | 2001-03-12 |
MF (application, 2nd anniv.) - small | 02 | 2001-04-16 | 2001-03-12 |
MF (application, 4th anniv.) - small | 04 | 2003-04-14 | 2003-04-04 |
MF (application, 5th anniv.) - small | 05 | 2004-04-14 | 2004-03-22 |
2004-06-14 | 2004-05-03 | ||
MF (application, 6th anniv.) - small | 06 | 2005-04-14 | 2005-04-07 |
2005-04-07 |
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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HONG HUANG |
Past Owners on Record |
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None |