Multi-station induction heating circuit and heating and control method thereof

Abstract

The invention discloses a multi-station induction heating circuit. The circuit comprises a power source converter; the input end of the power source converter is connected with an external three-phasenetwork voltage; a sine alternating-current voltage of which the power source converter frequency is f is outputted from two output ends of the power source converter; the circuit also comprises a heater; the heater comprises at least one heating module; each heating module comprises a heating inductor and a resonant capacitor; the heating inductor and the resonant capacitor are connected in parallel; one common end of the heating inductor and the resonant capacitor is connected with one output end of the power source converter; the other common end of the heating inductor and the resonant capacitor is connected with the other output end of the power source converter in a time-sharing manner; and the heater has a total natural resonance frequency f0, and the circuit maintains a state thatf is equal to f0 in a working process. Based on the heating circuit, the invention further provides a working method and a control method of the heating circuit. The heating circuit provided by the invention is simple in architecture and small in equipment size. With the heating circuit adopted, the problem of interference between heaters arranged on different stations is solved; and a good heating effect can be achieved.

Description

technical field [0001] The invention belongs to the technical field of induction heating, and in particular relates to an induction heating control circuit and a control method thereof. Background technique [0002] In the process of mechanical manufacturing, the same workpiece is usually produced in large quantities. When using induction heating technology to heat the same batch of workpieces with the same shape and the same size, it is often necessary to set up multiple stations. [0003] For example, a multi-station tempering induction heating device is disclosed in the patent application number "200820056447.0", which includes several induction heating coils, power output busbars, connecting copper bars and insulating backing plates, and the power output One end of the busbar is connected to the external power supply, the other end of the power output busbar is connected to the induction heating coil, and the connection between the power output busbar and the induction h...

AI Technical Summary

Problems solved by technology

[0009] For the above two heating demand scenarios, in the prior art, multiple induction heating devices are often used to form a heating pipeline to deal with it: each induction heating device is equipped with a heating coil and its corresponding control circuit, and multiple induction heating devices When working together in a narrow space, each heating coil is equivalent to an alternating magnetic field generator, and the alternating magnetic field generated by it is often coupled to the adjacent heating coil through the mutual inductance between the induction coils. Therefore, multiple When the induction heating equipment works at the same time, the magnetic field coupled to each heating coil is often greatly disturbed; at the same time, the magnetic field signal fed back from the heating coil to the control circuit is also chaotic, and the control circuit cannot accurately capture and determine the heating condition of the heating coil In this way, not only the workpiece itself cannot achieve the ideal heating effect, but the induction heating equipment itself is also affected by the distortion of the magnetic field, and there is a risk of damage

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