发明名称 |
Induction heating method and unit |
摘要 |
It is an object of the present invention to prevent temperature decrease in a border portion of each of heating coils and to enable to eliminate an influence given by the change in a load state. In order to attain this object, an induction heating unit according to the present invention is provided with control units respectively corresponding to a plurality of heating units. A phase detector of the control unit obtains a phase difference between an output current (heating coil current) of an inverter detected by a current transformer reference signal outputted by a reference signal generating section, and inputs it to a drive control section. The drive control section adjusts an output timing (phase) of a gate pulse to be given to the inverter so as to make a phase of the heating coil current of the inverter coincide with a phase of the reference signal outputted by the reference signal generating section. A phase control section controls a variable reactor so as to make the phases of an output voltage and the output current (heating coil current) of the inverter coincide with each other, and improves a power factor of the inverter. Each of the other control units also performs the same control operation. |
申请公布号 |
US7432481(B2) |
申请公布日期 |
2008.10.07 |
申请号 |
US20060474309 |
申请日期 |
2006.06.26 |
申请人 |
MITSUI ENGINEERING & SHIPBUILDING CO., LTD. |
发明人 |
UCHIDA NAOKI;KAWANAKA KEIJI;NANBA HIDEYUKI;OZAKI KAZUHIRO |
分类号 |
H05B6/04;H02J1/00 |
主分类号 |
H05B6/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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