一级黄色电影

Induction Heating

Power Electronics Devices Of Induction Heating

Thyristor 1
Runau thyristor

Induction heating is mainly used for metal smelting, heat preservation, sintering, welding, quenching, tempering, diathermy, liquid metal purification, heat treatment, pipe bending, and crystal growth.?The induction power supply is consisted?of rectifier circuit, inverter circuit, load circuit, control and protection circuit.

The medium frequency power supply technology for induction heating is a technology that rectifies the alternating current?power frequency (50Hz) to direct power then converts?to medium frequency (400Hz~200kHz) through power semiconductor devices such as thyristor, MOSFET?or IGBT. The technology features in?flexible control methods, large output power, and higher efficiency than the unit, and?convenient to change frequency?according to heating requirement.

The rectifier of the small and medium power supply equipment adopts three-phase thyristor rectification. For high-power power supply equipment, 12-pulse thyristor rectification will be?applied?to improve the power level of the power supply and reduce the grid-side harmonic current. The inverter power unit is composed of high-voltage high-current?fast switch thyristor parallel then series connected to?realize the high power output.

Inverter and resonant circuit can be divided into two types according to structural properties: 1) parallel resonant type, 2) series resonant type.

Parallel resonant type: high-voltage high-current?water-cooled thyristor?(SCR) is used to form a current-type inverter power unit, and high power output is realized by superposition of thyristors. The resonant circuit generally uses a complete?parallel resonance structure, also choose double-voltage or transformer mode to increase the voltage on inductor according to different requirement, mainly applied in heating treatment process.

Series resonant type: high-voltage high-current?water-cooled thyristor?(SCR) and fast diode are used to form a voltage-type inverter power unit, and high power output is realized by superposition of thyristors. The resonance circuit uses a series resonance structure, and the transformer is adopted to match?the load?requirement.?In addition to the advantages of high power factor?at Grid-side, wide power adjustment range, high heating efficiency and high start-up success rate, it’s become more and more widely used in current?years?and mainly applied in melting process.

After the improving of manufacturing process, Runau manufactured fast switch thyristor uses neutron radiation and other processes to further shorten the turn-off time?and the power capacity?is improved?consequently.

The induction heating medium frequency power supply adopts thyristor as the main power device has covered all fields with operating frequency below 8kHz. The output power?capacity is divided into 50, 160, 250, 500, 1000, 2000, 2500, 3000kW, 5000KW, 10000KW the operating frequency is 200Hz, 400Hz , 1kHz, 2.5kHz, 4kHz, 8kHz. 10 tons, 12 tons, 20 tons for?steel?melting and thermal reservation, the main?power equipment is?medium frequency power supply. Now the maximum output power capacity comes to 20000KW of 40Ton. And the thyristor is the key power conversion & inversion component to be applied.

Typical Product

Phase Controlled Thyristor

KP500A-1600V

KP800A-1600V

KP1000A-1600V

KP1200A-1600V

KP1500A-1600V

KP1800A-1600V

KP2500A-1600V

KP2500A-1600V

KP1800A-3500V

P2500A-3500V

KP1800A-4000V

KP2500A-4200V

Fast Switch Thyristor

KK500A-1600V

KK800A-1600V

KK1000A-1600V

KK1200A-1600V

KK1500A-1800V

KK1800A-1800V

KK2000A-2000V

KK2500A-2500V

KK3000A-3000V

KK1800A-3500V

Rectifier Diode

ZK1000A-2500V

ZK1500A-1800V

ZK1800A-3000V

ZK2000A-2500V

ZK2500A-2500V