发明授权
- 专利标题: Inverter power source control for high frequency heater
- 专利标题(中): 变频电源控制高频加热器
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申请号: US10558424申请日: 2004-05-25
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公开(公告)号: US07304869B2公开(公告)日: 2007-12-04
- 发明人: Shinobu Miyazaki , Masaki Nakaishi , Shinichi Masuda
- 申请人: Shinobu Miyazaki , Masaki Nakaishi , Shinichi Masuda
- 申请人地址: JP Osaka JP Osaka
- 专利权人: Tabuchi Electric Co., Ltd.,Sharp Kabushiki Kaisha
- 当前专利权人: Tabuchi Electric Co., Ltd.,Sharp Kabushiki Kaisha
- 当前专利权人地址: JP Osaka JP Osaka
- 代理机构: Birch, Stewart, Kolasch & Birch, LLP
- 优先权: JP2003-155353 20030530
- 国际申请: PCT/JP2004/007094 WO 20040525
- 国际公布: WO2004/107552 WO 20041209
- 主分类号: H02M7/122
- IPC分类号: H02M7/122 ; H02M1/36
摘要:
At least one of a start abnormality detector (31), a temperature abnormality detector (32) and a voltage abnormality detector (33) has a latch inhibiting circuit for inhibiting retention of a detecting state when one of the abnormality detectors detects an abnormality, so that a current abnormality detector (34) can be inhibited from detecting an abnormal input current caused when the oscillation is halted by the abnormality detector. Accordingly, after the abnormality is removed, automatic resetting can be easily accomplished without causing the oscillation to halt as a result of the current abnormality detector detecting the presence of the abnormality. Also, since a power source abnormality detecting circuit (30) is designed in the form of an analog circuit, a low cost can be achieved and the monitoring level can be modified. In addition, the monitoring level associated only with the temperature abnormality occurring in an IGBT element (7) can be modified.