US5569966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric vehicle propulsion system power bridge with built-in test
Assignee: Northrop Grumman Corp
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Filing: 1994-06-10
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Granted: 1996-10-29
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Expires: 2014-06-10
Abstract
Abstract A power bridge for an electric vehicle propulsion system, comprising a switching circuit including first and second switching elements operable between "on" and "off" states and a midpoint detector coupled to the switching circuit for detecting a failure of at least one of the first and second switching elements, where the midpoint detector is capable of detecting and isolating a failure when the switching elements are in the "on" or the "off" states.
Inventors
- 👤 David L. Schantz, Jr.
- 👤 Brian A. DeAbreu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:10
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/0833; H02H7/0844; B; B60; B60L; B60L3/00; B60L3/0023; B60L3/12; G; G01; G01R; G01R31/00; G01R31/40; G01R31/42
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
84 words
A power bridge for an electric vehicle propulsion system, comprising: a switching circuit including first and second switching elements operable between "on" and "off" states; and a midpoint detector coupled to the switching circuit for independently and simultaneously monitoring said first and second switching elements to thereby detect and isolate a failure of at least one of the first and second switching elements, said midpoint detector capable of detecting and isolating a failure when said switching elements are in the "on" or "off" states.
Claim 2
Dependent Claim
84 words
A power bridge for an electric vehicle propulsion system, comprising: a switching circuit including first and second switching elements operable between "on" and "off" states; and a midpoint detector coupled to the switching circuit for independently and simultaneously monitoring said first and second switching elements to thereby detect and isolate a failure of at least one of the first and second switching elements, said midpoint detector capable of detecting and isolating a failure when said switching elements are in the "on" or "off" states.
Claim 3
Dependent Claim
40 words
The power bridge according to claim 1, wherein the midpoint detector detects a failure of at least one of the first and second switching elements by detecting a voltage across at least one of the first and second switching elements.
Claim 4
Dependent Claim
20 words
The power bridge according to claim 1, wherein the first and second switching elements include first and second IGBTs, respectively.
Claim 5
Dependent Claim
49 words
The power bridge according to claim 3, wherein the first and second switching elements further include first and second diodes connected in parallel with the first and second IGBTs, respectively, and wherein the IGBT switching element further includes a capacitor connected in parallel with the first and second IGBTs.
Claim 6
Dependent Claim
90 words
The power bridge according to claim 1, wherein the midpoint detector includes a first voltage detector for detecting a voltage across the first switching element and a second voltage detector for detecting a voltage across the second switching element, and wherein the first voltage detector produces a first output signal having a first value upon detecting the voltage across the first switching element, and wherein the second voltage detector produces a second output signal having the second value upon detecting the presence of the voltage across the second switching element.
Claim 7
Dependent Claim
37 words
The power bridge according to claim 1, wherein the midpoint detector includes a first opto-coupler circuit connected in parallel with the first switching element and a second opto-coupler circuit connected in parallel with the second switching element.
Claim 8
Dependent Claim
96 words
The power bridge according to claim 6, wherein the first opto-coupler circuit produces a first output signal having a first value when the first switching element is in the "on" state and produces a second output signal having a second value when the first switching element is in the "off" state, and wherein the second opto-coupler circuit produces the first output signal having the first value when the second switching element is in the "on" state and produces the second output signal having the second value when the second switching element is in the "off" state.
Claim 9
Dependent Claim
35 words
The power bridge according to claim 3, wherein the midpoint detector includes a first opto-coupler circuit connected in parallel with the first IGBT and a second opto-coupler circuit connected in parallel with the second IGBT.
Claim 10
Dependent Claim
92 words
The power bridge according to claim 8, wherein the first opto-coupler circuit produces a first output signal having a first value when the first IGBT is in the "on" state and produces a second output signal having a second value when the first IGBT is in the "off" state, and wherein the second opto-coupler circuit produces the first output signal having the first value when the second IGBT is in the "on" state and produces the second output signal having the second value when the second IGBT is in the "off" state.
Claim 11
Dependent Claim
32 words
The power bridge according to claim 1, further comprising a gate drive circuit for providing gate drive signals to operate the first and second switching elements between the "on" and "off" states.
Claim 12
Dependent Claim
91 words
A power bridge for an electric vehicle propulsion system, comprising: a plurality of switching circuits each including first and second switching elements operable between "on" and "off" states; and a midpoint detector coupled to one of the plurality of switching circuits for independently and simultaneously monitoring said first and second switching elements to thereby detect and isolate a failure of at least one of the first and second switching elements, said midpoint detector capable of detecting and isolating a failure when said switching elements are in the "on" or "off" states.
Claim 13
Dependent Claim
91 words
A power bridge for an electric vehicle propulsion system, comprising: a plurality of switching circuits each including first and second switching elements operable between "on" and "off" states; and a midpoint detector coupled to one of the plurality of switching circuits for independently and simultaneously monitoring said first and second switching elements to thereby detect and isolate a failure of at least one of the first and second switching elements, said midpoint detector capable of detecting and isolating a failure when said switching elements are in the "on" or "off" states.
Claim 14
Dependent Claim
37 words
The power bridge according to claim 11, further comprising a plurality of gate drive circuits for providing gate drive signals to operate respective ones of the first and second switching elements between the "on" and "off" states.
References Cited (Backward Citations)
DE458300C
Cited
DE413938C
Cited
FR609158A
Cited
US3852656A
Cited
US4142151A
Cited
US4371824A
Cited
EP0073943A1
Cited
US4631474A
Cited
US4626952A
Cited
GB2242580A
Cited
US5111123A
Cited
FR2680007A1
Cited
US5402045A
Cited
FR2689823A1
Cited
WO1994011747A1
Cited
US5355295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-29 | 2000-04-29 | 2000-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-29 | 2004-04-29 | 2004-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-29 | 2008-04-29 | 2008-10-29 | $7700.00 | Window Closed / Lapsed |