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US 12,388,441 B2Granted
Gate driving circuit
AssigneeRohm Co., Ltd.
InventorsShinya Tajima, Seiya Kitagawa
Life of this patent
Estimating the term…
Abstract
A gate drive circuit (201) includes: a PNP transistor (Q1) having an emitter connected to a gate of a driven transistor (Q) and a collector connected to a ground application terminal; a capacitor (C1) having a first end connected to a base of the PNP transistor and a second end connected to the ground application terminal; a base-emitter resistor (R1) having a first end connected to the emitter of the PNP transistor and a second end connected to the base of the PNP transistor; an electric charge supplying portion (201A); an electric charge extracting portion (201B); a charging portion (201C); and a discharging portion (201D).
Claims15
A gate driving circuit comprising:
- a PNP transistor having
- an emitter connected to a gate of a driving target transistor and
- a collector connected to an application terminal for a ground potential;
- a capacitor having
- a first terminal connected to a base of the PNP transistor and
- a second terminal connected to the application terminal for the ground potential;
- a base-emitter resistor having
- a first terminal connected to the emitter of the PNP transistor and
- a second terminal connected to the base of the PNP transistor;
- a charge supplier configured to be capable of supplying electric charge to the gate of the driving target transistor;
- a charge extractor configured to be capable of extracting electric charge from the gate of the driving target transistor;
- a charger configured to be capable of charging the capacitor when the charge supplier supplies electric charge to the gate of the driving target transistor;
- a discharger configured to be capable of discharging the capacitor when the charge extractor extracts electric charge from the gate of the driving target transistor;
- a high-side NPN transistor having a collector connected to an application terminal for a supply voltage;
- an on-resistor having
- a first terminal connected to an emitter of the high-side NPN transistor and
- a second terminal connected to the gate of the driving target transistor;
- a low-side PNP transistor having a collector connected to the application terminal for the ground potential;
- an off-resistor having
- a first terminal connected to an emitter of the low-side PNP transistor and
- a second terminal connected to the gate of the driving target transistor,
- wherein the on-resistor and the off-resistor are separate from each other;
- an emitter-connected diode having
- an anode connected to the emitter of the high-side NPN transistor and
- a cathode connected to the emitter of the low-side PNP transistor;
- and
- a charge/discharge resistor having
- a first terminal connected to a third node to which the emitter of the low-side PNP transistor and the first terminal of the off-resistor are connected and
- a second terminal connected to the first terminal of the capacitor.
26 more elements
A gate driving circuit comprising:
- a PNP transistor having
- an emitter connected to a gate of a driving target transistor and
- a collector connected to an application terminal for a ground potential;
- a capacitor having
- a first terminal connected to a base of the PNP transistor and
- a second terminal connected to the application terminal for the ground potential;
- a base-emitter resistor having
- a first terminal connected to the emitter of the PNP transistor and
- a second terminal connected to the base of the PNP transistor;
- a charge supplier configured to be capable of supplying electric charge to the gate of the driving target transistor;
- a charge extractor configured to be capable of extracting electric charge from the gate of the driving target transistor;
- a charger configured to be capable of charging the capacitor when the charge supplier supplies electric charge to the gate of the driving target transistor;
- a discharger configured to be capable of discharging the capacitor when the charge extractor extracts electric charge from the gate of the driving target transistor;
- a high-side NPN transistor having a collector connected to an application terminal for a supply voltage;
- a low-side PNP transistor having a collector connected to the application terminal for the ground potential;
- and
- an on/off-resistor having
- a first terminal connected to a fourth node to which an emitter of the high-side NPN transistor and an emitter of the low-side PNP transistor are connected and
- a second terminal connected to the gate of the driving target transistor,
- wherein
- the charger includes a charge resistor having
- a first terminal connected to a fifth node to which the fourth node and the first terminal of the on/off-resistor are connected and
- a second terminal connected to the first terminal of the capacitor, and the discharger includes the base-emitter resistor and the on/off-resistor.
20 more elements
Dependencies are inferred from the claim text.