摘要
基于PWM理论,设计了一种脉宽调制型功率放大器。该放大器采用典型的RC起振电路产生三角波,输入指令电压和三角波相比较后,生成PWM信号作为驱动/控制电路的输入信号,驱动/控制电路的输出信号用来控制四个功率MOS管的开启或关闭。这四个MOS管组成一个H功率全桥。该放大器具有输出电流大、输出效率高、抗干扰能力强等特点。以对电机的驱动和控制为例,简单介绍了电路的实际应用。
Based on the operational theory of pulse-width modulation （PWM）, a power amplifier was designed, in which a typical RC oscillator was used to generate triangle waves. By comparing the triangle wave with an order voltage signal, a PWM signal was generated, which was used as input signal of the drive-controller circuit. And the output signal of the driver-controller was used to control 4 power MOSFET＇ s, of which the H-bridge was comprised. The amplifier features high output current and efficiency, and it is insensitive to useless signals. Application of the amplifier in motor drive and control is described.
出处
《微电子学》
CAS
CSCD
北大核心
2007年第4期584-587,共4页
Microelectronics
关键词
脉宽调制
功率放大器
H功率桥
Pulse-width modulation （PWM）
Power amplifier
H-bridge
