关键词: 中频变频器, 方波逆变器, 脉冲幅度调制, 脉冲宽度调制, 转换电路

Abstract:

Intermediate frequency converter can be used for driving high-speed grinding motor of internal grinding machine. The designed intermediate frequency converter is a DCV chopped wave-controlling frequency conversion device, in which voltage and frequency are under the same control of master voltage to realize U/f common modulation; thus, the two achieve favorable cooperation. Starting circuit of the converter adopted function generator. In PWM pulse train generation circuit, V/f switching circuit, f/V switching circuit and frequency PI regulator circuit and others were adopted, while in PWM signal generation circuit,hexagonal frequency cyclometerand double dual and/or select gate circuit were adopted, which at last was designed into a 150°conduction-type square wave inverter.The designed intermediate frequency converter has been widely applied in grinding machine of bearing industry.

Key words: intermediate frequency converter, square wave inverter, pulse amplitude modulation (PAM), pulse width modulation (PWM), switching circuit