US5633793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soft switched three-phase boost rectifiers and voltage source inverters
Assignee: Virginia Tech Intellectual Properties Inc
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Filing: 1995-01-23
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Granted: 1997-05-27
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Expires: 2015-01-23
Abstract
Abstract A boost rectifier is provided with an ultra high speed diode in its direct current rail to reduce diode reverse recovery loss with or without implementing a soft switching technique. Full zero-voltage-transition (ZVT) as well as zero-current-transition (ZCT) may also be achieved by adding a simple auxiliary network across the DC rail which operates only during the short turn-on transients of the bridge switches. Similarly, a simple, inexpensive auxiliary circuit can be added to the DC rail of a conventional voltage source inverter shown to implement both ZVT and ZCT.
Inventors
- 👤 Fred C. Lee
- 👤 Yimin Jiang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:19
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/4826; H02M7/02; H02M7/04; H02M7/06; H02M7/062; H02M7/12; H02M7/21; H02M7/217; H02M7/219; H02M7/53; H02M7/537; H02M7/5387; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A three-phase boost rectifier for converting a three-phase alternating current power supply to a direct current power supply, comprising: a three-phase alternating current power input; a switching bridge connected between said alternating power input and a direct current rail output, said switching bridge comprising a plurality of switches each having an anti-parallel diode associated therewith; a direct current rail diode connecting said switching bridge and said direct current rail output, said direct current rail diode being faster than said anti-parallel diodes; and an auxiliary circuit connected across said switching bridge for achieving zero-voltage-transition, said auxiliary circuit comprising: a resonant inductor and an auxiliary diode connected in series across said direct current rail diode; and an auxiliary switch having a first pole connected between said resonant inductor and said auxiliary diode and a second pole connected to ground.
Claim 2
Dependent Claim
137 words
A three-phase boost rectifier for converting a three-phase alternating current power supply to a direct current power supply, comprising: a three-phase alternating current power input; a switching bridge connected between said alternating power input and a direct current rail output, said switching bridge comprising a plurality of switches each having an anti-parallel diode associated therewith; a direct current rail diode connecting said switching bridge and said direct current rail output, said direct current rail diode being faster than said anti-parallel diodes; and an auxiliary circuit connected across said switching bridge for achieving zero-voltage-transition, said auxiliary circuit comprising: a resonant inductor and an auxiliary diode connected in series across said direct current rail diode; and an auxiliary switch having a first pole connected between said resonant inductor and said auxiliary diode and a second pole connected to ground.
Claim 3
Dependent Claim
140 words
A three-phase boost rectifier for convening a three-phase alternating current power supply to a direct current power supply, comprising: a three-phase alternating current power input; a switching bridge connected between said alternating power input and a direct current rail output, said switching bridge comprising a plurality of switches each having an anti-parallel diode associated therewith; a direct current rail diode connecting said switching bridge and said direct current rail output, said direct current rail diode being faster than said anti-parallel diodes; and an auxiliary circuit connected across said switching bridge for achieving zero-current-transition, said auxiliary circuit comprising: a resonant capacitor, a resonant inductor and an auxiliary diode connected in series across said direct current rail diode; and an auxiliary switch having a first pole connected between said resonant inductor and said auxiliary diode and a second pole connected to ground.
Claim 4
Dependent Claim
140 words
A three-phase boost rectifier for convening a three-phase alternating current power supply to a direct current power supply, comprising: a three-phase alternating current power input; a switching bridge connected between said alternating power input and a direct current rail output, said switching bridge comprising a plurality of switches each having an anti-parallel diode associated therewith; a direct current rail diode connecting said switching bridge and said direct current rail output, said direct current rail diode being faster than said anti-parallel diodes; and an auxiliary circuit connected across said switching bridge for achieving zero-current-transition, said auxiliary circuit comprising: a resonant capacitor, a resonant inductor and an auxiliary diode connected in series across said direct current rail diode; and an auxiliary switch having a first pole connected between said resonant inductor and said auxiliary diode and a second pole connected to ground.
Claim 5
Dependent Claim
113 words
A zero-voltage-transition voltage source inverter for converting a direct current power supply to a three-phase alternating current output, comprising: a direct current power input; a switching bridge connected between said direct current power input and said three-phase alternating current output; and an auxiliary circuit connected between said direct current power input and said switching bridge, said auxiliary circuit comprising: a rail switch connected to a direct current rail of said direct current power input; an auxiliary switch connected in series with a resonant inductor across said rail switch; and an auxiliary diode connected at a first end between said auxiliary switch connected and said resonant inductor and at a second end to ground.
Claim 6
Dependent Claim
113 words
A zero-voltage-transition voltage source inverter for converting a direct current power supply to a three-phase alternating current output, comprising: a direct current power input; a switching bridge connected between said direct current power input and said three-phase alternating current output; and an auxiliary circuit connected between said direct current power input and said switching bridge, said auxiliary circuit comprising: a rail switch connected to a direct current rail of said direct current power input; an auxiliary switch connected in series with a resonant inductor across said rail switch; and an auxiliary diode connected at a first end between said auxiliary switch connected and said resonant inductor and at a second end to ground.
Claim 7
Dependent Claim
117 words
A zero-current-transition voltage source inverter for converting a direct current power supply to a three-phase alternating current output, comprising: a direct current power input; a switching bridge connected between said direct current power input and said three-phase alternating current output; and an auxiliary circuit connected between said direct current power input and said switching bridge, said auxiliary circuit comprising: a rail switch connected to the direct current rail of said direct current power input; an auxiliary switch connected in series with a resonant inductor and a resonant capacitor across said rail switch; and an auxiliary diode connected at a first end between said auxiliary switch connected and said resonant inductor and at a second end to ground.
Claim 8
Dependent Claim
117 words
A zero-current-transition voltage source inverter for converting a direct current power supply to a three-phase alternating current output, comprising: a direct current power input; a switching bridge connected between said direct current power input and said three-phase alternating current output; and an auxiliary circuit connected between said direct current power input and said switching bridge, said auxiliary circuit comprising: a rail switch connected to the direct current rail of said direct current power input; an auxiliary switch connected in series with a resonant inductor and a resonant capacitor across said rail switch; and an auxiliary diode connected at a first end between said auxiliary switch connected and said resonant inductor and at a second end to ground.
Claim 9
Dependent Claim
152 words
A bi-directional zero-voltage-transition (ZVT) converter, comprising: a direct current power terminal; a switching bridge connected between said direct current power terminal and a three-phase alternating current terminal; a rail switch connected to the direct current rail of said direct current power terminal; an ultra fast diode connected in parallel with said rail switch; and an auxiliary circuit connected between said direct current power terminal and said switching bridge, said auxiliary circuit comprising: a first auxiliary switch and anti-parallel diode connected in series with a resonant inductor across said rail switch; and an second auxiliary switch and anti-parallel diode connected at a first end between said first auxiliary switch and said resonant inductor and at a second end to ground, whereby when said rail switch and said first auxiliary switch are open, said converter is a boost rectifier, and if said second auxiliary switch is open, said converter is a voltage source inverter.
Claim 10
Dependent Claim
152 words
A bi-directional zero-voltage-transition (ZVT) converter, comprising: a direct current power terminal; a switching bridge connected between said direct current power terminal and a three-phase alternating current terminal; a rail switch connected to the direct current rail of said direct current power terminal; an ultra fast diode connected in parallel with said rail switch; and an auxiliary circuit connected between said direct current power terminal and said switching bridge, said auxiliary circuit comprising: a first auxiliary switch and anti-parallel diode connected in series with a resonant inductor across said rail switch; and an second auxiliary switch and anti-parallel diode connected at a first end between said first auxiliary switch and said resonant inductor and at a second end to ground, whereby when said rail switch and said first auxiliary switch are open, said converter is a boost rectifier, and if said second auxiliary switch is open, said converter is a voltage source inverter.
Claim 11
Dependent Claim
156 words
A bi-directional zero-current-transition (ZCT) converter, comprising: a direct current power terminal; a switching bridge connected between said direct current power terminal and a three-phase alternating current terminal; a rail switch connected to the direct current rail of said direct current power terminal; an ultra fast diode connected in parallel with said rail switch; and an auxiliary circuit connected between said direct current power terminal and said switching bridge, said auxiliary circuit comprising: a first auxiliary switch and anti-parallel diode connected in series with a resonant inductor and a resonant capacitor across said rail switch; and an second auxiliary switch and anti-parallel diode connected at a first end between said first auxiliary switch and said resonant inductor and at a second end to ground, whereby when said rail switch and said first auxiliary switch are open, said converter is a boost rectifier and if said second auxiliary switch is open, said converter is a voltage source inverter.
Claim 12
Dependent Claim
156 words
A bi-directional zero-current-transition (ZCT) converter, comprising: a direct current power terminal; a switching bridge connected between said direct current power terminal and a three-phase alternating current terminal; a rail switch connected to the direct current rail of said direct current power terminal; an ultra fast diode connected in parallel with said rail switch; and an auxiliary circuit connected between said direct current power terminal and said switching bridge, said auxiliary circuit comprising: a first auxiliary switch and anti-parallel diode connected in series with a resonant inductor and a resonant capacitor across said rail switch; and an second auxiliary switch and anti-parallel diode connected at a first end between said first auxiliary switch and said resonant inductor and at a second end to ground, whereby when said rail switch and said first auxiliary switch are open, said converter is a boost rectifier and if said second auxiliary switch is open, said converter is a voltage source inverter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-05-26 | 2000-11-25 | 2001-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-26 | 2004-11-25 | 2005-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-26 | 2008-11-25 | 2009-05-27 | $7700.00 | Window Closed / Lapsed |