Patent ID: 11923833
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 9:
10. A switch driving device, comprising:
a gate driver configured to be powered by a bootstrap circuit and to drive an N-type semiconductor switch element;
a current limiter configured to limit a current flowing between an anode of a boot diode included in the bootstrap circuit and a first power supply, and
a current controller configured to control operation of the current limiter,
wherein
the current controller includes a switch and a resistor, the switch and the resistor being connected in parallel between the anode of the boot diode and the first power supply, and
the current controller is configured to perform on/off control of the switch so that,
turns the switch off state when a voltage of the first power supply is equal to a first voltage, and
turns the switch on state when the voltage of the first power supply is equal to a second voltage lower than the first voltage.