Patent ID: 9019000
Filing Date: 2015-04-28
Classification: H03K

Abstract:
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 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.