The TPChT-250 thyristor current converter for induction heating is designed for stand-alone operation as a module in power supply systems for induction furnaces used for vacuum and open melting of ferrous and non-ferrous metals, through-heating, heat treatment, glass melting in optical manufacturing, and for powering special-purpose induction units.
More powerful thyristor converter models are also available: the TPChT-320 and TPChT-600.

Operating principle of the TPChT-250.
The converter is designed using a two-stage frequency conversion circuit with an intermediate DC link. It consists of a three-phase bridge rectifier, smoothing chokes, a starting circuit, a bridge current inverter, and a control system. The load is a parallel oscillatory circuit consisting of an inductor and a compensating capacitor bank. The rectifier is designed to convert three-phase AC voltage to DC, regulate the converter's output parameters, and provide fast, contactless protection during inverter overloads and stall conditions.
Smoothing chokes are designed to generate the continuous current required for inverter operation, filter the alternating current components caused by rectified voltage pulsations, and limit the rate of rise of short-circuit current during inverter stall conditions.
The starting circuit pre-starts the inverter to minimum power.
The inverter is designed to convert DC current to single-phase AC current of high frequency and regulate the converter's output parameters.

Control System.
The control system performs the following functions:
- control of start-up, shutdown, and protection;
- signaling of operating modes and faults;
- ensuring the required control laws;
- providing of algorithms for supplying and removing control pulses to the rectifier and inverter thyristors;
- generating of control pulses to thyristors with specified parameters.
- formation of a pause with an audible signal before switching off in case of violation of the water cooling mode.