US5428523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current sharing signal coupling/decoupling circuit for power converter systems
Assignee: Acbel Polytech Inc
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Filing: 1993-03-30
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Granted: 1995-06-27
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Expires: 2013-03-30
Abstract
Abstract An improved current sharing signal coupling/decoupling circuit for power converter systems, including the provision of an individual current sharing signal coupling/decoupling circuit for each module of a number of parallel connected modules, each circuit providing an interface between a module's "current sharing signal" port and a common connection bus. The signal coupling/decoupling circuits also share a common ground noted in the disclosure as "current sharing signal ground". The signal coupling/decoupling circuit includes a comparator, a bi-directional switch and a variable voltage reference. The comparator senses the difference between the voltage on the common connection bus, the "common current sharing signal," less an amount set by the variable voltage reference circuit, and the voltage on the module current sharing signal port, the "module current sharing signal". If the module current sharing signal drops below the common current sharing signal, the comparator activates the bi-directional switch, disconnecting the module current sharing signal port from the common connection bus, allowing the remaining parallel connected modules to continue normal operation, thus providing a system that is tolerant of individual module faults. If n modules are the minimum number required to meet a system's current output specification, then the use of n+1, n+2, . . . n+N modules with corresponding current coupling/decoupling circuits will allow for continued operation of the system in the event of failure of 1, 2, . . . N modules, the system reliability increasing with the number of modules in excess of n.
Inventors
- 👤 John E. McDonnal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:25
CPC Classifications
H; H02; H02J; H02J1/00; H02J1/10; H02J1/001; H02J1/102
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
216 words
A circuit for coupling/decoupling the current sharing signal terminal of a power converter module to an interconnecting bus in a power supply system including a plurality of current mode controlled power converter modules normally having their current sharing signal terminals connected to the interconnecting bus, the output terminals of said modules being connected in parallel to energize a common load, the circuit comprising: reference means for developing a reference voltage; comparator means for comparing the voltage developed at the current sharing signal terminal of a corresponding power converter module to said reference voltage and operative to generate a control signal having a first signal state when a first predetermined difference indicative of normal operation of the module is detected between the compared voltages, and having a second signal state when a second predetermined difference indicative of a malfunctioning module is detected between the compared voltages; and switching means responsive to said control signal and operative to connect said current sharing signal terminal to said interconnecting bus when said control signal is of said first signal state, and to disconnect said current sharing signal terminal from said interconnecting bus when said control signal is of said second signal state, whereby in the event said corresponding power converter module malfunctions, it will be effectively disconnected from the system.
Claim 2
Dependent Claim
216 words
A circuit for coupling/decoupling the current sharing signal terminal of a power converter module to an interconnecting bus in a power supply system including a plurality of current mode controlled power converter modules normally having their current sharing signal terminals connected to the interconnecting bus, the output terminals of said modules being connected in parallel to energize a common load, the circuit comprising: reference means for developing a reference voltage; comparator means for comparing the voltage developed at the current sharing signal terminal of a corresponding power converter module to said reference voltage and operative to generate a control signal having a first signal state when a first predetermined difference indicative of normal operation of the module is detected between the compared voltages, and having a second signal state when a second predetermined difference indicative of a malfunctioning module is detected between the compared voltages; and switching means responsive to said control signal and operative to connect said current sharing signal terminal to said interconnecting bus when said control signal is of said first signal state, and to disconnect said current sharing signal terminal from said interconnecting bus when said control signal is of said second signal state, whereby in the event said corresponding power converter module malfunctions, it will be effectively disconnected from the system.
Claim 3
Dependent Claim
38 words
A circuit as recited in claim 1 wherein said reference means is coupled to said interconnecting bus and is operative to cause said reference voltage to have a predetermined relationship to the voltage appearing on said interconnecting bus.
Claim 4
Dependent Claim
129 words
A circuit as recited in claim 1 wherein said reference means develops a first reference voltage and a second reference voltage, said second reference voltage being different than said first reference voltage, and wherein said comparator means compares the voltage developed at the current sharing signal terminal of the corresponding power converter module to both said first reference voltage and said second reference voltage, and generates said control signal of said first signal state when the voltage developed at the current sharing signal terminal lies between said first reference voltage and said second reference voltage, and generates said control signal of said second signal state when said voltage developed at the current sharing signal terminal lies outside the range between the first reference voltage and the second reference voltage.
Claim 5
Dependent Claim
24 words
A circuit as recited in claim 1 wherein said switching means is a bi-directional electronic device allowing current to flow in either direction therethrough.
Claim 6
Dependent Claim
220 words
A power supply system comprising: a plurality of current mode controlled power converter modules each having a current sharing signal terminal and a power output terminal, the power output terminals being connected together and adapted to power a common load; an interconnecting bus; and a plurality of current sharing signal coupling/decoupling circuits each of which is associated with one of said modules, each said circuit including reference means for developing a reference voltage; comparator means for comparing the voltage developed at the current sharing signal terminal of the associated power converter module to said reference voltage and operative to generate a control signal having a first signal state when a first predetermined difference indicative of normal operation of the associated module is detected between the compared voltages, and having a second signal state when a second predetermined difference indicative of a malfunctioning module is detected between the compared voltages; and switching means responsive to said control signal and operative to connect said current sharing signal terminal to said interconnecting bus when said control signal is of said first signal state, and to disconnect said current sharing signal terminal from said interconnecting bus when said control signal is of said second signal state, whereby in the event the associated power converter module malfunctions, it will be effectively disconnected from the system.
Claim 7
Dependent Claim
220 words
A power supply system comprising: a plurality of current mode controlled power converter modules each having a current sharing signal terminal and a power output terminal, the power output terminals being connected together and adapted to power a common load; an interconnecting bus; and a plurality of current sharing signal coupling/decoupling circuits each of which is associated with one of said modules, each said circuit including reference means for developing a reference voltage; comparator means for comparing the voltage developed at the current sharing signal terminal of the associated power converter module to said reference voltage and operative to generate a control signal having a first signal state when a first predetermined difference indicative of normal operation of the associated module is detected between the compared voltages, and having a second signal state when a second predetermined difference indicative of a malfunctioning module is detected between the compared voltages; and switching means responsive to said control signal and operative to connect said current sharing signal terminal to said interconnecting bus when said control signal is of said first signal state, and to disconnect said current sharing signal terminal from said interconnecting bus when said control signal is of said second signal state, whereby in the event the associated power converter module malfunctions, it will be effectively disconnected from the system.
Claim 8
Dependent Claim
61 words
A power supply system as recited in claim 5 and further comprising power monitoring, system control means for monitoring the power supplied by said power supply system and operative to cause selected ones of said control circuits to disconnect its associated power converter module from said system as required to maintain operation of said power supply system at a predetermined efficiency.
Claim 9
Dependent Claim
73 words
A power supply system as recited in claim 6 wherein said power monitoring, system control includes logic circuitry connected to the current sharing signal terminal of each said module, and is operative to cause a selected module to be effectively disconnected from the system by changing the voltage level at the selected terminal to a value sufficient to cause the associated comparator means to generate a control signal of said second signal state.
Claim 10
Dependent Claim
40 words
A power supply system as recited in claim 5 wherein said reference means is coupled to said interconnecting bus and is operative to cause said reference voltage to have a predetermined relationship to the voltage appearing on said interconnecting bus.
Claim 11
Dependent Claim
131 words
A power supply system as recited in claim 5 wherein said reference means develops a first reference voltage and a second reference voltage, said second reference voltage being different than said first reference voltage, and wherein said comparator means compares the voltage developed at the current sharing signal terminal of the associated power converter module to both said first reference voltage and said second reference voltage, and generates said control signal of said first signal state when the voltage developed at the current sharing signal terminal lies between said first reference voltage and said second reference voltage, and generates said control signal of said second signal state when said voltage developed at the current sharing signal terminal lies outside the range between the first reference voltage and the second reference voltage.
Claim 12
Dependent Claim
70 words
A power supply system as recited in claim 5 wherein each said module further includes an output sense port, and wherein said system further comprises: a plurality of start-up assist circuits each of which is connected between the sense port and output terminal of an associated module and the load, said start-up circuits being operative to assure start-up of the associated module each time it is connected into the system.
Claim 13
Dependent Claim
44 words
A power supply system as recited in claim 10 wherein each said start-up circuit includes a first resistance means connected between an associated sense port and the load, and a second resistance means connected between said associated sense port and an associated output port.
Claim 14
Dependent Claim
41 words
A power supply system as recited in claim 10 wherein said system further comprises: a plurality of load decoupling means each of which is associated with one of said modules and is connected between the associated output terminal and the load.
Claim 15
Dependent Claim
18 words
A power supply system as recited in claim 12 wherein said load decoupling means includes an ORing diode.
Claim 16
Dependent Claim
61 words
A power supply system as recited in claim 12 and further comprising power monitoring, system control means for monitoring the power supplied by said power supply system and operative to cause selected ones of said control circuits to disconnect its associated power converter module from said system as required to maintain operation of said power supply system at a predetermined efficiency.
Claim 17
Dependent Claim
40 words
A power supply system as recited in claim 14 wherein said reference means is coupled to said interconnecting bus and is operative to cause said reference voltage to have a predetermined relationship to the voltage appearing on said interconnecting bus.
Claim 18
Dependent Claim
131 words
A power supply system as recited in claim 14 wherein said reference means develops a first reference voltage and a second reference voltage, said second reference voltage being different than said first reference voltage, and wherein said comparator means compares the voltage developed at the current sharing signal terminal of the associated power converter module to both said first reference voltage and said second reference voltage, and generates said control signal of said first signal state when the voltage developed at the current sharing signal terminal lies between said first reference voltage and said second reference voltage, and generates said control signal of said second signal state when said voltage developed at the current sharing signal terminal lies outside the range between the first reference voltage and the second reference voltage.
Claim 19
Dependent Claim
24 words
A circuit as recited in claim 2 wherein said switching means is a bi-directional electronic device allowing current to flow in either direction therethrough.
Claim 20
Dependent Claim
24 words
A circuit as recited in claim 3 wherein said switching means is a bi-directional electronic device allowing current to flow in either direction therethrough.
References Cited (Backward Citations)
US4030015A
Cited
US4150425A
Cited
US4680689A
Cited
US4695933A
Cited
US4719559A
Cited
US4929882A
Cited
US4975820A
Cited
US5036452A
Cited
US5164890A
Cited
US5122726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-26 | 1998-12-26 | 1999-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-26 | 2002-12-26 | 2003-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-26 | 2006-12-26 | 2007-06-27 | $7700.00 | Window Closed / Lapsed |