Triode group protection method and device for power supply of induction heating furnace

Abstract

The invention relates to the technical field of a circuit of an induction heating furnace, and discloses a triode group protection method and device for a power supply of the induction heating furnace. In the protection device adopted by the method, each triode group of a rectification circuit 1 and each triode group of an inversion circuit 2 of the power supply of the induction heating furnace are provided with triode group protection circuits, each triode group protection circuit is provided with a plurality of triode protection circuits corresponding to each triode, each triode protection circuit comprises a resistor group voltage resistant voltage and a resistor group absorption circuit which are arranged in parallel, one end in parallel is connected with a collector of each triode, and the other end in parallel is connected with an emitter of each triode. The triode group protection device still can normally work when the working voltage peak of each triode group exceeds 5,000-6,000 V, the end voltage of each triode reaches five to six times and electric is leaked, the triode sill can be maintained to work for a certain time by the triode protection circuit when a fault occurs in the triode circuit, and the triode is prevented from being immediately damaged.

Description

technical field [0001] The invention relates to the technical field of induction heating furnace circuits, in particular to a method and device for protecting a triode group of an induction heating furnace power supply. Background technique [0002] The current induction heating equipment, including medium frequency heating furnace, high frequency heating furnace and heat treatment heating device, has high requirements on the safety and reliability of induction heating equipment, especially in the circuit of induction heating equipment, the triode group composed of rectifier circuit 1 connected in series and The triode group composed of inverter circuit 2 in series works at 5000V-6000V. When the peak value of the working voltage reaches 5 to 6 times or leakage, the triode group of the circuit may be damaged, causing the induction heating equipment to fail to work and causing the induction heating equipment to fail. The molten steel heated by the smelting furnace 3 and the wo...

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Problems solved by technology

[0002] The current induction heating equipment, including intermediate frequency heating furnace, high frequency heating furnace and heat treatment heating device, has high requirements on the safety and reliability of induction heating equipment, especially in the circuit of induction heating equipment, the triode group composed of rectifier circuit 1 connected in series and The triode group composed of inverter circuit 2 in series works at 5000V-6000V. When the peak value of the working voltage reaches 5 to 6 times or leakage, the triode group of the circuit may be damaged, causing the induction heating equipment to fail to work and causing the induction heating equipment to fail. The molten steel heated by the smelting furnace 3 and the workpiece being heat-treated are scrapped; and there is a problem of replacing the triode group. In order to prevent it from being damaged, imported resistors are generally used to form the working voltage circuit of the triode group. Because each triode group uses imported The damage of the withstand voltage resistance also causes the damage of the triode group, causing the molten steel heated by the induction heating equipment and the workpiece undergoing heat treatment to be scrapped

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