Patent ID: 8294437

Claim:
A power management device for controlling a power supply device, comprising: a pulse generator that generates a pulse signal; a delay unit connected to the power supply device to receive an output voltage of the power supply device and correspondingly generate a delay voltage; a first XOR gate, two input ends of the first XOR gate respectively connected to the power supply device and the delay unit to receive the output voltage and the delay voltage, thereby generating a first control signal on an output end of the first XOR gate; an OR gate, two input ends of the OR gate respectively connected to the pulse generator and the output end of the first XOR gate to receive the pulse signal and the first control signal, thereby generating a second control signal on an output end of the OR gate; and a second XOR gate, two input ends of the second XOR gate respectively connected to the output end of the OR gate and the delay unit to receive the second control signal and the delay voltage, thereby generating an enabling signal on an output end of the second XOR gate; the output end of the second XOR gate connected to the power supply device, and the enabling signal controlling the power supply device to be enabled and disabled.