摘 要: 本设计是基于一款脉冲宽度调制控制器TL494的逆变电源,主要由脉宽调制控制电路,逆变升压电路两部分组成。该电路选用TL494为控制器,输出PWM波形来控制两组场效应管轮流导通或关断,然后利用升压变压器得到220V50Hz交流。同时TL494通过两个内部的误差放大器来实现输入过流保护和输出稳压保护的功能。该设计电路简单,实用性强,成本低,适用于各种小功率场合。
关键词:逆变;PWM;场效应管
DESIGN OF INVERTER POWER SUPPLY BASED ON TL494
Abstract: The design is an inverter power supply based on the pulse width modulation controller,TL494,which consist of two parts, pulse width modulation controlling circuit and inverse and step-up circuit.This circuit chooses the TL494 as controller to output PWM waveform to control two sets of field-effect tubes to breakover or turn-off by turn,then,get 220V50Hz alternating current with step-up transformer .At the same time,TL494 achieves the function of input overcurrent safty and output voltage stabilization through two internal error amplifiers.The design, with simple-circuit,strong practicability and low-cost, is applicable to various low power situation.
Key words:inverter ;PWM ;field-effect tubes