发明授权
- 专利标题: Discharge tube lighting transformer with protective circuit against non-grounding of ground terminal
- 专利标题(中): 放电管照明变压器,带有接地端子非接地保护电路
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申请号: US10871035申请日: 2004-06-21
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公开(公告)号: US07199988B2公开(公告)日: 2007-04-03
- 发明人: Hitoshi Komori , Hideki Shimizu , Kazuhifo Kobayashi , Yoshihiro Matsui
- 申请人: Hitoshi Komori , Hideki Shimizu , Kazuhifo Kobayashi , Yoshihiro Matsui
- 申请人地址: JP Gifu
- 专利权人: Lecip Corporation
- 当前专利权人: Lecip Corporation
- 当前专利权人地址: JP Gifu
- 代理机构: Connolly Bove Lodge & Hutz LLP
- 优先权: JP2003-185291 20030627
- 主分类号: H02H3/00
- IPC分类号: H02H3/00 ; H02H7/122 ; H01F17/00
摘要:
An arrangement is made in a transformer such that voltages induced on the opposite sides of a mid-point 17 of a secondary winding 16 are unbalanced by an amount on the order of 5%. When a ground terminal 18 is not grounded while a mid-point of a load is grounded, a voltage VUE is developed between the mid-point 17 and a non-active line terminal 15 and is rectified to provide a rectified output which turns a transistor 28 on, causing a light emitting element 33L to emit light. The resulting light renders a light receiving element 33P conductive, whereby a relay 37 is operated to turn a switch 13 off. When a ground fault occurs on one side of the secondary winding 16 while the ground terminal 16 is not grounded, a ground fault detection circuit 38 fails to detect the ground fault, but the non-grounding protection circuit 30 detects the ground fault and turns the switch 13 off.