| 摘要 |
The method and the system are applicable in metallurgy and metalworking, especially in pieces of equipment operating by the method of induction heating. These guarantee maximum release of the preset power in the load circuit and minimum disturbances from the reswitching of the rectifying thyristors. The method includes starting by a start-up device making use of the elements of the resonance inverter by divided switching capacitor, self-synchronization by feedback in the system, operation in mode of impact self-excitation and frequency power adjustment at fully adjusted rectifier with overload protection. The control frequency of the inverter by which the power of the load circuit is adjusted is function of the availability of oscillations of the load circuit but is alwayseither equal or an odd multiple number times lower than the momentum resonance frequency of the load circuit, depending on the preset power. The system includes a limiter (1), neuter detector (2), pulse shaper (3), inverter (4), second pulse shaper (5), control microcomputer (7) with specialized software, controllable thyristor retifier (8), control, monitoring and signalling unit (9), third pulse shaper (10), pulse distributor (11) and resonance inverter (12).
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