Patent ID: 9467134
Filing Date: 2016-10-11
CPC Classification: H02M,H03K

Claim Text:
1. A pulse width modulation (PWM) control unit, comprising: a comparison unit comparing an output voltage with a reference voltage to generate a first compared result and controlling a voltage of a first node according to the first compared result; a constant current source receiving an input voltage and coupled to the first node; a storage module coupled to the first node and receiving a ground voltage; a first comparator comparing the output voltage with the voltage of the first node to generate a turn-on signal; a second comparator comparing the voltage of the first node with the input voltage to generate an output signal; a logic gate generating a turn-off signal according to the turn-on signal and the output signal, wherein when each of the turn-on signal and the output signal is at a first level, the logic gate asserts the turn-off signal at a second level, and the first level is lower than the second level; and a PWM generator combining the turn-on signal and the turn-off signal to generate a PWM signal.