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US 12,368,435 B2Granted
Gate drive circuit
AssigneeMitsubishi Electric Corporation
InventorsYuji Nemoto, Kohei Onda, Takayoshi Miki, Shota Morisaki
Life of this patent
Estimating the term…
Abstract
A control unit of a gate drive circuit applies, between a gate and a source of a switching element, a first voltage so as to turn on the switching element. After transference of drain current of the switching element, the control unit interrupts the first voltage and applies, between the gate and the source of the switching element, a second voltage that is lower than the first voltage and that is higher than a mirror voltage of the switching element. When no short-circuit current is flowing to the switching element, the control unit interrupts the second voltage and applies, between the gate and the source of the switching element, a third voltage higher than the second voltage.
Claims20
A gate drive circuit comprising
- a controller which applies, between a gate and a source of a switching element to be driven, a gate voltage and drives the switching element, wherein
- the controller
- applies, between the gate and the source of the switching element, a first voltage from a first power supply so as to turn on the switching element,
- after transference of drain current of the switching element, interrupts the first voltage and applies, between the gate and the source of the switching element, a second voltage that is lower than the first voltage and that is higher than a mirror voltage of the switching element from a second power supply different from the first power supply so as to decrease a voltage between the gate and the source of the switching element to the second voltage from the first voltage or a voltage equal to or higher than the second voltage, and
- when no short-circuit current is flowing to the switching element to be driven, interrupts the second voltage and applies, between the gate and the source of the switching element, a third voltage higher than the second voltage.
2 more elements
A gate drive circuit comprising:
- a controller which applies, between a gate and a source of a switching element to be driven, a gate voltage and drives the switching element;
- a first gate resistor, a first switching element, and a first power supply which are connected in series to the gate of the switching element to be driven;
- a second gate resistor, a fourth switching element, and a fourth power supply which are connected in series to the gate of the switching element to be driven;
- a first diode, a first transistor, and a first resistor which are connected in series between the gate of the switching element to be driven and the fourth power supply;
- and
- a second transistor having an emitter connected to the fourth power supply, the second transistor having a collector connected to the first power supply via a second resistor and a second diode, wherein
- the second diode is connected to a base of the first transistor, and
- the controller
- turns on the first switching element so as to apply, between the gate and the source of the switching element to be driven, a first voltage from the first power supply, to turn on the switching element to be driven,
- after transference of drain current of the switching element to be driven, interrupts the first voltage and turns on the second transistor so as to apply, between the gate and the source of the switching element to be driven, a second voltage that is lower than the first voltage and that is higher than a mirror voltage of the switching element to be driven, and
- when no short-circuit current is flowing to the switching element to be driven, interrupts the second voltage and applies, between the gate and the source of the switching element to be driven, a third voltage higher than the second voltage.
8 more elements
A gate drive circuit comprising
- a controller which applies, between a gate and a source of a switching element to be driven, a gate voltage and drives the switching element, wherein
- the controller
- applies, between the gate and the source of the switching element, a first voltage from a first power supply so as to turn on the switching element,
- after transference of drain current of the switching element, interrupts the first voltage and applies, between the gate and the source of the switching element, a second voltage that is lower than the first voltage and that is higher than a mirror voltage of the switching element from a second power supply different from the first power supply, and
- when no short-circuit current is flowing to the switching element to be driven, interrupts the second voltage and applies, between the gate and the source of the switching element, a third voltage that is lower than the first voltage and that is higher than the second voltage.
2 more elements
Dependencies are inferred from the claim text.