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US5298797A
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Gate charge recovery circuit for gate-driven semiconductor devices
Assignee: Asahi Kasei Toko Power Devices Corp
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Filing: 1993-03-12
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Granted: 1994-03-29
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Expires: 2013-03-12
Abstract
Abstract A gate charge recovery circuit prevents generation of the voltage spike that would otherwise appear across the sense resistor that is employed to detect the current flowing through the switched terminal of a gate-driven semiconductor device when the device is turned on. The gate charge recovery circuit comprises the combination of a capacitor connected between the reference terminal of the semiconductor device and the positive terminal of a driver and a filter resistor connected between the positive terminal of the driver and the positive terminal of a voltage source.
Inventors
- 👤 Richard Redl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:11
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/16; H03K17/168; H03K17/161; H03K17/162; H03K19/00; H03K19/0008; H03K19/0019; H03K2217/00; H03K2217/0036; H03K2217/0081
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
129 words
In a circuit wherein a gate-driven semiconductor device is configured with a current sense device connected between a gate voltage reference terminal of said semiconductor device and a first terminal of a voltage source supplying a gate-driving voltage to said semiconductor device, a gate-driving device having an output terminal connected to a gate terminal of said semiconductor device and having a supply terminal through which current flows to or from said output terminal in order to force said semiconductor device to an ON state, the improvement comprising: a capacitor connected between said gate voltage reference terminal of said semiconductor device and said supply terminal of said gate-driving device; and a filter element connected between said supply terminal of said gate-driving device and a second terminal of said voltage source.
Claim 2
Dependent Claim
129 words
In a circuit wherein a gate-driven semiconductor device is configured with a current sense device connected between a gate voltage reference terminal of said semiconductor device and a first terminal of a voltage source supplying a gate-driving voltage to said semiconductor device, a gate-driving device having an output terminal connected to a gate terminal of said semiconductor device and having a supply terminal through which current flows to or from said output terminal in order to force said semiconductor device to an ON state, the improvement comprising: a capacitor connected between said gate voltage reference terminal of said semiconductor device and said supply terminal of said gate-driving device; and a filter element connected between said supply terminal of said gate-driving device and a second terminal of said voltage source.
Claim 3
Dependent Claim
14 words
A circuit as in claim 1 wherein said gate-driven semiconductor device comprises a MOSFET.
Claim 4
Dependent Claim
13 words
A circuit as in claim 1 wherein said filter element comprises a resistor.
Claim 5
Dependent Claim
13 words
A circuit as in claim 1 wherein said filter element comprises an inductor.
Claim 6
Dependent Claim
15 words
A circuit as in claim 1 wherein said filter element comprises a voltage-limited current source.
Claim 7
Dependent Claim
128 words
A gate charge recovery circuit comprising: a gate-driven semiconductor device; a voltage source supplying a gate-driving voltage to said semiconductor device; a current sense device connected between a gate voltage reference terminal of said semiconductor device and a first terminal of said voltage source; a gate-driving device having an output terminal connected to a gate terminal of said semiconductor device and having a supply terminal through which current flows to or from said output terminal in order to force said semiconductor device to an ON state; a capacitor connected between said gate voltage reference terminal of said semiconductor device and said supply terminal of said gate-driving device; and a filter element connected between said supply terminal of said gate-driving device and a second terminal of said voltage source.
Claim 8
Dependent Claim
128 words
A gate charge recovery circuit comprising: a gate-driven semiconductor device; a voltage source supplying a gate-driving voltage to said semiconductor device; a current sense device connected between a gate voltage reference terminal of said semiconductor device and a first terminal of said voltage source; a gate-driving device having an output terminal connected to a gate terminal of said semiconductor device and having a supply terminal through which current flows to or from said output terminal in order to force said semiconductor device to an ON state; a capacitor connected between said gate voltage reference terminal of said semiconductor device and said supply terminal of said gate-driving device; and a filter element connected between said supply terminal of said gate-driving device and a second terminal of said voltage source.
Claim 9
Dependent Claim
43 words
A circuit as in claim 1 wherein said current sense device includes a first pair of terminals for carrying a current to be sensed and a second pair of terminals for providing a voltage that is proportional to said current to be sensed.
Claim 10
Dependent Claim
14 words
A circuit as in claim 6 wherein said gate-driven semiconductor device comprises a MOSFET.
Claim 11
Dependent Claim
13 words
A circuit as in claim 6 wherein said filter element comprises a resistor.
Claim 12
Dependent Claim
13 words
A circuit as in claim 6 wherein said filter element comprises an inductor.
Claim 13
Dependent Claim
15 words
A circuit as in claim 6 wherein said filter element comprises a voltage-limited current source.
References Cited (Backward Citations)
US4215280A
Cited
US5021747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |