US5144547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectifying circuit with FETs
Assignee: NEC Corp
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Filing: 1991-06-06
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Granted: 1992-09-01
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Expires: 2011-06-06
Abstract
Abstract A rectifying circuit having rectifying elements in the form of FETs (Field Effect Transistors) and applicable to a switching regulator or similar device. The rectifying circuit has a gate discharging circuit which half-wave rectifies the drive voltages for the FETs and discharges charges stored in the gate capacitance of each FET. The circuit reduces the drive losses of the FETs to a considerable degree.
Inventors
- 👤 Kazuhiko Masamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:57
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/04; H03K17/041; H03K17/0412; H03K17/04123; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33569; H02M3/33576; H02M3/33592; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/21; H02M7/217; H03K17/51; H03K17/56; H03K17/687; H03K17/689; H03K17/691; H03K2217/00; H03K2217/0036; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
A rectifying circuit for rectifying an AC voltage fed from an AC power source, comprising: a first and a second FET (Field Effect Transistors) serving as rectifying elements, said first and second FETs having drains thereof commonly connected at a junction, a current from said AC power source being applied to between sources of said first and second FETs to cause a rectified output voltage to appear on said junction; and gate discharging means for half-wave rectifying drive voltages for said first and second FETs and discharging charges stored in gate capacitances of said first and second FETs.
Claim 2
Dependent Claim
98 words
A rectifying circuit for rectifying an AC voltage fed from an AC power source, comprising: a first and a second FET (Field Effect Transistors) serving as rectifying elements, said first and second FETs having drains thereof commonly connected at a junction, a current from said AC power source being applied to between sources of said first and second FETs to cause a rectified output voltage to appear on said junction; and gate discharging means for half-wave rectifying drive voltages for said first and second FETs and discharging charges stored in gate capacitances of said first and second FETs.
Claim 3
Dependent Claim
98 words
A circuit as claimed in claim 1, wherein said gate discharging means comprises: a first and a second transistor having emitters thereof respectively connected to gates of said first and second FETs and collectors thereof respectively connected to said sources of said first and second FETs; a first and a second diode having cathodes thereof respectively connected to emitters of said first and second transistors and anodes thereof respectively connected to bases of said first and second transistors; and a third and a fourth diode having cathodes thereof respectively connected to anodes of said first and second diodes.
Claim 4
Dependent Claim
66 words
A circuit as claimed in claim 2, wherein said AC power source comprises a primary winding P to which said AC voltage is applied, a first secondary winding connected at opposite ends thereof to said cathode of said third diode and said collector of said first transistor, and a second secondary winding connected at opposite ends thereof to said collectors of said first and second transistors.
Claim 5
Dependent Claim
55 words
A circuit as claimed in claim 3, further comprising an inductor comprising a first winding connected at one end thereof to said junction of said drains of said first and second FETs, and a secondary winding connected at opposite ends thereof to an anode of said fourth diode and said source of said second FET.
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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |