US5349514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduced-resonant-current zero-voltage-switched forward converter using saturable inductor
Assignee: Origin Electric Co Ltd
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Filing: 1992-10-19
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Granted: 1994-09-20
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Expires: 2012-10-19
Abstract
Abstract A resonant forward converter comprises a saturable inductor connected in series to a primary winding of a transformer and a switching device. The saturable inductor has a predetermined value of inductance in a light current region and a small value of inductance at a predetermined integral voltage due to magnetic saturation.
Inventors
- 👤 Shuichi Ushiki
- 👤 Ryoji Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:08
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33538; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
209 words
A zero-voltage-switched forward converter, comprising: a DC power supply; a transformer having a primary winding connected in series to said DC power supply and a secondary winding magnetically coupled with said primary winding; a switching device connected in series to said primary winding of said transformer; a first resonant capacitance connected in parallel to said switching device; a saturable inductor inserted in series in said primary winding of said transformer and said switching device, said saturable inductor having a predetermined value of inductance in a light current region and a small value of inductance at a predetermined integral voltage due to magnetic saturation, said saturable inductor having a non-saturated inductance which accumulates magnetic energy to discharge said first resonant capacitance up to zero voltage for zero voltage turning-on of said switching device; a rectifier diode connected in series to said secondary winding of said transformer; a free wheeling diode interposed between one end of said secondary winding of said transformer and one end of said rectifier diode; choke input smoothing circuit means, connected in parallel to said free wheeling diode, for smoothing current passing through said secondary winding of said transformer; and control circuit means for providing a control signal to said switching device to control a conduction thereof.
Claim 2
Dependent Claim
209 words
A zero-voltage-switched forward converter, comprising: a DC power supply; a transformer having a primary winding connected in series to said DC power supply and a secondary winding magnetically coupled with said primary winding; a switching device connected in series to said primary winding of said transformer; a first resonant capacitance connected in parallel to said switching device; a saturable inductor inserted in series in said primary winding of said transformer and said switching device, said saturable inductor having a predetermined value of inductance in a light current region and a small value of inductance at a predetermined integral voltage due to magnetic saturation, said saturable inductor having a non-saturated inductance which accumulates magnetic energy to discharge said first resonant capacitance up to zero voltage for zero voltage turning-on of said switching device; a rectifier diode connected in series to said secondary winding of said transformer; a free wheeling diode interposed between one end of said secondary winding of said transformer and one end of said rectifier diode; choke input smoothing circuit means, connected in parallel to said free wheeling diode, for smoothing current passing through said secondary winding of said transformer; and control circuit means for providing a control signal to said switching device to control a conduction thereof.
Claim 3
Dependent Claim
22 words
A zero-voltage-switched forward converter as claimed in claim 1, wherein said first resonant capacitance includes an output capacitance of said switching device.
Claim 4
Dependent Claim
24 words
A zero-voltage-switched forward converter as claimed in claim 2, further including a capacitance of a resonant capacitor connected in parallel to said switching device.
Claim 5
Dependent Claim
36 words
A zero-voltage-switched forward converter as claimed in claim 1, wherein said saturable inductor includes a first winding wound on a core with a rectangular hysteresis, and a linear inductor connected in parallel to said first winding.
Claim 6
Dependent Claim
45 words
A zero-voltage-switched forward converter as claimed in claim 1, wherein said saturable inductor includes a first winding wound on a core with a rectangular hysteresis, a second winding magnetically coupled with said first winding, and a linear inductor connected in parallel to said second winding.
Claim 7
Dependent Claim
55 words
A zero-voltage-switched forward converter as claimed in claim 1, wherein said saturable inductor includes a first winding wound on a core with a rectangular hysteresis, a second winding magnetically coupled with said first winding, and a third winding connected in parallel to said second winding and failing to be magnetically coupled with said first winding.
Claim 8
Dependent Claim
30 words
A zero-voltage-switched forward converter as claimed in claim 1, further comprising: a second resonant capacitance connected in parallel to said rectifier diode for zero voltage turning-off of said rectifier diode.
Claim 9
Dependent Claim
22 words
A zero-voltage-switched forward converter as claimed in claim 7, wherein said second resonant capacitance includes a junction capacitance of said rectifier diode.
Claim 10
Dependent Claim
202 words
A zero-voltage-switched forward converter, comprising: a DC power supply; a transformer having a primary winding connected in series to said DC power supply and a secondary winding magnetically coupled with said primary winding; a switching device connected in series to said primary winding of said transformer; a resonant capacitance connected in parallel to said switching device; a saturable inductor connected in series to said primary winding of said transformer and said switching device, said saturable inductor having a predetermined value of inductance in a light current region and a small value of inductance at a predetermined integral voltage due to magnetic saturation, said saturable inductor including a first winding wound on a core with a rectangular hysteresis, a second winding magnetically coupled with said first winding, and a linear inductor connected in parallel to said second winding; a rectifier diode connected in series to said secondary winding of said transformer; a free wheeling diode interposed between one end of said secondary winding of said transformer and one end of said rectifier diode. an output filter connected in parallel to said free wheeling diode; and a control circuit means for providing a control signal to said switching device to control a conduction thereof.
Claim 11
Dependent Claim
202 words
A zero-voltage-switched forward converter, comprising: a DC power supply; a transformer having a primary winding connected in series to said DC power supply and a secondary winding magnetically coupled with said primary winding; a switching device connected in series to said primary winding of said transformer; a resonant capacitance connected in parallel to said switching device; a saturable inductor connected in series to said primary winding of said transformer and said switching device, said saturable inductor having a predetermined value of inductance in a light current region and a small value of inductance at a predetermined integral voltage due to magnetic saturation, said saturable inductor including a first winding wound on a core with a rectangular hysteresis, a second winding magnetically coupled with said first winding, and a linear inductor connected in parallel to said second winding; a rectifier diode connected in series to said secondary winding of said transformer; a free wheeling diode interposed between one end of said secondary winding of said transformer and one end of said rectifier diode. an output filter connected in parallel to said free wheeling diode; and a control circuit means for providing a control signal to said switching device to control a conduction thereof.
Claim 12
Dependent Claim
212 words
A zero-voltage-switched forward converter, comprising: a DC power supply; a transformer having a primary winding connected in series to said DC power supply and a secondary winding magnetically coupled with said primary winding; a switching device connected in series to said primary winding of said transformer; a resonant capacitance connected in parallel to said switching device; a saturable inductor connected in series to said primary winding of said transformer and said switching device, said saturable inductor having a predetermined value of inductance in a light current region and a small value of inductance at a predetermined integral voltage due to magnetic saturation, said saturable inductor including a first winding wound on a core with a rectangular hysteresis, a second winding magnetically coupled with said first winding, and a third winding connected in parallel to said second winding and failing to be magnetically coupled with said first winding; a rectifier diode connected in series to said secondary winding of said transformer; a free wheeling diode interposed between one end of said secondary winding of said transformer and one end of said rectifier diode; an output filter connected in parallel to said free wheeling diode; and a control circuit means for providing a control signal to said switching device to control a conduction thereof.
Claim 13
Dependent Claim
212 words
A zero-voltage-switched forward converter, comprising: a DC power supply; a transformer having a primary winding connected in series to said DC power supply and a secondary winding magnetically coupled with said primary winding; a switching device connected in series to said primary winding of said transformer; a resonant capacitance connected in parallel to said switching device; a saturable inductor connected in series to said primary winding of said transformer and said switching device, said saturable inductor having a predetermined value of inductance in a light current region and a small value of inductance at a predetermined integral voltage due to magnetic saturation, said saturable inductor including a first winding wound on a core with a rectangular hysteresis, a second winding magnetically coupled with said first winding, and a third winding connected in parallel to said second winding and failing to be magnetically coupled with said first winding; a rectifier diode connected in series to said secondary winding of said transformer; a free wheeling diode interposed between one end of said secondary winding of said transformer and one end of said rectifier diode; an output filter connected in parallel to said free wheeling diode; and a control circuit means for providing a control signal to said switching device to control a conduction thereof.
References Cited (Backward Citations)
US4399376A
Cited
US4417153A
Cited
US4435746A
Cited
US4977493A
Cited
US5086381A
Cited
US5079689A
Cited
US5126931A
Cited
JPH04165956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |