Abstract: The disclosure provides a power control device, which comprises a bleeder circuit forming a first discharging path and an aux low-voltage (LV) power supply unit forming a second discharging path. The bleeder circuit is connected with a voltage-regulating capacitor stably maintaining the high-voltage (HV) level from a HV battery. The aux LV power supply unit is connected with the bleeder circuit and the voltage-regulating capacitor in parallel. The aux LV power supply unit provides an aux LV level to the driver, when the power system operates abnormally, the HV level is discharged through the first and second discharging path and/or a third discharging path formed by a driver and a motor.

Abstract: An operation method and an operation device of a motor driver for driving a motor are provided. The operation method includes: establishing a hysteresis control method; and adjusting a switch frequency of a power module for operating the motor by using the hysteresis control method according to a change of rotation speed of the motor and a current switch frequency.

Abstract: An operation method and an operation device of a motor driver for driving a motor are provided. The operation method includes: establishing a hysteresis control method; and adjusting a switch frequency of a power module for operating the motor by using the hysteresis control method according to a change of rotation speed of the motor and a current switch frequency.