公开(公告)号：US20150349767A1

公开(公告)日：2015-12-03

申请号：US14484835

申请日：2014-09-12

Applicant: Nuvoton Technology Corporation

Inventor： How-Wei WU

IPC: H03K7/08 ,  H02M3/158

CPC classification number: H03K7/08 ,  H02M3/156 ,  H02M3/158 ,  H02M2001/0045

Abstract: A PWM control unit is provided. A comparison unit compares an output voltage with a reference voltage to generate a first compared result, and controls a voltage of a first node. A constant current source is coupled to the first node. A storage module is coupled to the first node and receives a ground voltage. A first comparator compares the output voltage with the voltage of the first node to generate a turn-on signal. A second comparator compares the voltage of the first node with the input voltage to generate an output signal. A logic gate generates a turn-off signal according to the turn-on and output signals. When each of the turn-on and output signals is at a first level, a logic gate asserts the turn-off signal at a second level. The PWM generator combines the turn-on and turn-off signals to generate a PWM signal.

Abstract translation: 提供PWM控制单元。 比较单元将输出电压与参考电压进行比较以产生第一比较结果，并且控制第一节点的电压。 恒定电流源耦合到第一节点。 存储模块耦合到第一节点并且接收地电压。 第一比较器将输出电压与第一节点的电压进行比较以产生导通信号。 第二比较器将第一节点的电压与输入电压进行比较以产生输出信号。 逻辑门根据导通和输出信号产生关断信号。 当每个导通和输出信号处于第一电平时，逻辑门将第二电平关断信号置为有效。 PWM发生器组合导通和关断信号以产生PWM信号。