Overview:
In this paper, a parallel resonant inverter power supply design scheme for induction heating is proposed, which is analyzed and designed for its main circuit, chopper circuit and inverter control circuit. It has been proved that the scheme has strong practicability.
1 Introduction In the industries of metal melting, bending, hot forging, welding and surface heat treatment in modern industry, induction heating technology is widely used. Induction heating is based on the principle of electromagnetic induction. It uses the heat generated by the eddy current in the workpiece to heat the workpiece. It has high heating efficiency, high speed, good controllability, easy to achieve high temperature and local heating, and easy to realize mechanization and automation.
With the development of power electronics and power semiconductor devices, the basic topology of induction heating Power Supplies has been continuously improved, generally consisting of rectifiers, filters, inverters and some control and protection circuits. The inverter plays an important role in the induction heating power supply. According to the characteristics of the inverter, the inverter power supply is divided into two types: series resonance and parallel resonance. In this paper, a parallel resonant inverter power supply design scheme for induction heating is proposed, which is analyzed and designed for its main circuit, chopper circuit and inverter control circuit.
2 Circuit structure and design of inverter power supply 
The system block diagram of the power supply is shown in Figure 1. The three-phase AC voltage is converted to a DC voltage after being controlled by the rectification and filtering circuit. The voltage is sent to the DC chopper for chopper regulation and becomes a power-adjustable approximate constant current. After the source is input to the inverter, then the induction heating load is controlled. The DC chopping control part detects the current signal of the chopping output through the sensor, and controls the output pulse width of the PWM through the PI regulator, thereby changing the magnitude of the chopping output current and realizing the closed-loop control. The inverter control part uses the phase-locked loop frequency tracking circuit to control the operating frequency of the inverter, generates a high-frequency trigger pulse, and drives the on and off of the power device in the inverter circuit.
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