Patent US2875124A successfully refreshed from Google Patents.
Patent US4876635A successfully refreshed from Google Patents.
US4876635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Series resonant inverter with lossless snubber-resetting components
Assignee: General Electric Co
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Filing: 1988-12-23
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Granted: 1989-10-24
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Expires: 2008-12-23
Abstract
Abstract A circuit for "resetting" snubbers in a series resonant bridge inverter maintains lossless snubber action during light-load and no-load inverter operation and during operation near resonance. Series resonant circuit operation is controlled to be above the resonant frequency to ensure operation at a lagging power factor. The snubber-resetting operation is facilitated by a relatively small inductor connected across the output terminals of the series resonant inverter.
Inventors
- 👤 John N. Park
- 👤 Robert L. Steigerwald
- 👤 Michael J. Schutten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:01
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/08; H03K17/081; H03K17/0814; H03K17/08148; H02; H02M; H02M3/00; H02M3/01; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33569; H02M3/33573; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/4815; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
An improved series resonant bridge inverter, comprising: two pairs of controllable switch means, the switch means of each pair being connected in series and each pair of series-connected switch means being adapted to be connected in parallel across a DC supply; a series resonant circuit connected between the junctions of the controllable switch means in each pair of controllable switch means and comprising a capacitor and an inductor, said series resonant circuit further having means for coupling the output of the resonant inverter to a load, said controllable switch means providing a rectangular wave signal to said resonant circuit; a snubber capacitor coupled across each of said controllable switch means; and circuit means coupled to said series resonant circuit for drawing sufficient current to ensure that each said snubber capacitor is discharged before turning on the respective switch means coupled thereacross.
Claim 2
Dependent Claim
141 words
An improved series resonant bridge inverter, comprising: two pairs of controllable switch means, the switch means of each pair being connected in series and each pair of series-connected switch means being adapted to be connected in parallel across a DC supply; a series resonant circuit connected between the junctions of the controllable switch means in each pair of controllable switch means and comprising a capacitor and an inductor, said series resonant circuit further having means for coupling the output of the resonant inverter to a load, said controllable switch means providing a rectangular wave signal to said resonant circuit; a snubber capacitor coupled across each of said controllable switch means; and circuit means coupled to said series resonant circuit for drawing sufficient current to ensure that each said snubber capacitor is discharged before turning on the respective switch means coupled thereacross.
Claim 3
Dependent Claim
21 words
The inverter of claim 1 wherein said circuit means comprises a snubber-resetting inductor connected in parallel across said series resonant circuit.
Claim 4
Dependent Claim
22 words
The inverter of claim 1 wherein said controllable switch means comprises an insulated-gate bipolar junction transistor connected in anti-parallel with a diode.
Claim 5
Dependent Claim
15 words
The inverter of claim 1 wherein said controllable switch means comprises a field effect transistor.
Claim 6
Dependent Claim
152 words
An improved DC-to-DC converter, comprising: a series resonant inverter having two pairs of controllable switch means, the switch means of each pair being connected in series and each pair of series-connected switch means being adapted to be connected in parallel across a DC supply; a series resonant circuit connected between the junctions of the controllable switch means in each pair of controllable switch means and comprising a capacitor and an inductor, said controllable switch means providing a rectangular wave signal to said resonant circuit; a snubber capacitor coupled across each of said controllable switch means; circuit means coupled to said series resonant circuit for drawing sufficient current to ensure that each said snubber capacitor is discharged before turning on the respective switch means coupled thereacross; and a full wave rectifier coupled to said series resonant circuit, the output of said rectifier being adapted to apply substantially constant output voltage to a load.
Claim 7
Dependent Claim
152 words
An improved DC-to-DC converter, comprising: a series resonant inverter having two pairs of controllable switch means, the switch means of each pair being connected in series and each pair of series-connected switch means being adapted to be connected in parallel across a DC supply; a series resonant circuit connected between the junctions of the controllable switch means in each pair of controllable switch means and comprising a capacitor and an inductor, said controllable switch means providing a rectangular wave signal to said resonant circuit; a snubber capacitor coupled across each of said controllable switch means; circuit means coupled to said series resonant circuit for drawing sufficient current to ensure that each said snubber capacitor is discharged before turning on the respective switch means coupled thereacross; and a full wave rectifier coupled to said series resonant circuit, the output of said rectifier being adapted to apply substantially constant output voltage to a load.
Claim 8
Dependent Claim
21 words
The converter of claim 5 wherein said circuit means comprises a snubber-resetting inductor connected in parallel across said series resonant circuit.
Claim 9
Dependent Claim
22 words
The converter of claim 5 wherein said controllable switch means comprises an insulated-gate bipolar junction transistor connected in anti-parallel with a diode.
Claim 10
Dependent Claim
15 words
The converter of claim 5 wherein said controllable switch means comprises a field effect transistor.
Claim 11
Dependent Claim
38 words
The converter of claim 5 wherein said series resonant circuit includes transformer means coupling said full wave rectifier to said series resonant circuit, said transformer means including a primary winding connected in series with said series resonant circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |