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VOLTAGE RESONANCE TYPE CONVERTER, INDUCTION HEATING TYPE POWER SUPPLY, FIXING APPARATUS AND START OF THE VOLTAGE RESONANCE TYPE CONVERTER
VOLTAGE RESONANCE TYPE CONVERTER, INDUCTION HEATING TYPE POWER SUPPLY, FIXING APPARATUS AND START OF THE VOLTAGE RESONANCE TYPE CONVERTER
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机译:电压谐振型转换器,感应加热型电源,固定装置和电压谐振型转换器的启动
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摘要
PROBLEM TO BE SOLVED: To safely activate a voltage resonance type converter and induction heating type power supply. SOLUTION: Prior to starting, a photocoupler 14 is turned on to turn on a transistor 15 connected in parallel to a filter capacitor 7 in order to reduce a voltage of the filter capacitor 7. When a voltage of the filter capacitor 7 is reduced to about zero, a photocoupler 21 turns off and the voltage drop is detected by a control circuit 18. Depending on this detection, the control circuit 18 supplies a switching pulse to the gate of a switching device 10 and thereby the switching operation can be started smoothly and safely from the point near the zero-cross of the power supply.
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