发明授权
US4962346A Transitory current recirculation through a power switching transistor
driving an inductive load
失效
通过驱动感性负载的功率开关晶体管的瞬态电流再循环
- 专利标题： Transitory current recirculation through a power switching transistor driving an inductive load
- 专利标题（中）： 通过驱动感性负载的功率开关晶体管的瞬态电流再循环
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申请号： US180501申请日： 1988-04-12
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公开(公告)号： US4962346A公开(公告)日： 1990-10-09
- 发明人: Giampietro Maggioni , Fabio Marchio , Marco Morelli , Francesco Tricoli
- 申请人： Giampietro Maggioni , Fabio Marchio , Marco Morelli , Francesco Tricoli
- 申请人地址： ITX
- 专利权人： SGS-Thomson Microelectronics, S.p.A.
- 当前专利权人： SGS-Thomson Microelectronics, S.p.A.
- 当前专利权人地址： ITX
- 优先权： ITX83618A/87 19870414; ITX83639A/87 19870630
- 主分类号： H03K17/16
- IPC分类号： H03K17/16 ; H03K17/082 ; H03K17/64
摘要：
A circuit for recirculating an inductive load's (L) discharge current through the driving power switching transistor (Tpw) utilizes a control transistor (Tc) of opposite polarity to that of the power transistor and capable of withstanding a minimum fraction (1/.beta.) of the discharge current. The circuit has the advantage of allowing recirculation of current with a fixed overvoltage independent of the value of the supply voltage, without requiring additional power devices. The circuit may also be provided with means (D1, D2 and DZ1) to turn-on the control transistor in the presence of concomitant supply overvoltages to protect the power device from dumping effects.
公开/授权文献
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