Patent ID: 8294299
Filing Date: 2012-10-23
Classification: H02M

Abstract:
1. A control device for a DC-DC converter, the control device comprising: a pulse width modulation (PWM) controller, for generating a PWM signal sent to a switch module of the DC-DC converter according to a feedback signal of the DC-DC converter, the switch module comprising: an amplifier, coupled to a front end, a power end, a ground end and an upper-bridge switch transistor, for amplifying the PWM signal; and an inverter, coupled to the front end, the power end, the ground end and a lower-bridge switch transistor, for amplifying the PWM signal and generating an inverted signal of the PWM signal; a logic circuit, for generating a selection signal according to a magnitude of an output current of the DC-DC converter; and a multiplexer, electrically coupled to a plurality of voltages, the logic circuit and the power end, for selecting one of the plurality of voltages to be a supply voltage of the switch module according to the selection signal.