A ROBUST HIGH-VOLTAGE SQUARE-WAVE SIGNAL GENERATOR WITH AOJUSTARLE FREQUENCY

摘要

In this article, we are describing our design of a robust high-voltage square-wave signal source with adjustable frequency. The design utilizes four IGBTs (Insulated Gate Bipolar Translators) to form a full-bridge circuit powered by a high-voltage DC power supply. A PLC (Programmable Logic Controller) module that produces PWM (Pulse Width Modulation) signals controls the IBGT full-bridge circuit through an IGBT driver board. Then, the high-voltage square-wave signals of variable frequency are produced as the frequency of the PWM signal changes. The whole circuit is illustrated in Figure l. The output of the high-voltage DC power supply is controlled by a low-voltage signal between o and 5V provided by the PLC module. The maximum output values are 1000V and lA, respectively. Four IGBTs in the full-bridge circuit are powered by the high-voltage DC power supply. IGBT1 with IGBT4 and IGBT2 with IGBT3 are switched on in turn under control of the PWM signal, generating the high-voltage square wave signals. The PLC module and the PC are connected through the RS-485 port. Parameters of the high-voltage square-wave signal are controlled by the PLC module.