| 摘要 |
A driver circuit for a semiconductor switching device includes a drive power source, a capacitor and four switches, which form a bridge circuit. The capacitor is provided between the four switches. In one cycle of application of a voltage to a gate of the semiconductor switching device to turn on the semiconductor switch, the first and the second switches, which are diagonal, are turned off and the third and the fourth switches, which are diagonal, are turned on to charge the capacitor. Then only the first switch is turned on to apply the voltage to the gate, and lastly only the second switch is turned on to discharge the capacitor thereby to apply a negative voltage to the gate of the semiconductor switching device. |
| 主权项 |
1. A driver circuit for driving a semiconductor switching device by applying to a control terminal of the semiconductor switching device a voltage supplied directly or indirectly from a drive power source, the driver circuit comprising:
a first semiconductor switch having a function of conducting and shutting off a current of at least one direction; a second semiconductor switch having a function of conducting and shutting off a current of at least one direction; and a storage device having a charge storage function and is chargeable by the drive power source through a first charge path and a second charge path, wherein one output terminal of the drive power source is connected to one current on/off terminal of the semiconductor switching device, the first semiconductor switch is provided in a path, which connects the other output terminal of the drive power source and the control terminal, the storage device is provided in a path, which connects the control terminal and one terminal of the second semiconductor switch, the second semiconductor switch is connected in a path, which connects the storage device and the one output terminal of the drive power source, the first charge path is a current supply path, which connects the other output terminal of the drive power source and the control terminal through the storage device, the second charge path is a current supply path, which connects the control terminal and the one output terminal of the drive power source, a voltage is applied to the control terminal of the semiconductor switching device in each cycle of voltage application, the cycle includes a first state of turning on the first semiconductor switch and turning off the second semiconductor switch and a second state of turning off the first semiconductor switch and turning on the second semiconductor switch, and the cycle further includes a third state of turning off the first semiconductor switch and the second semiconductor switch at least once in a predetermined period, which includes a period of application of the voltage to the control terminal of the semiconductor switching device. |
