发明授权
US4309752A Cycloconverter apparatus with controllable end stop firing pulse control means 失效
具有可控停止点火脉冲控制装置的旋转变频器装置

  • 专利标题: Cycloconverter apparatus with controllable end stop firing pulse control means
  • 专利标题(中): 具有可控停止点火脉冲控制装置的旋转变频器装置
  • 申请号: US95803
    申请日: 1979-11-19
  • 公开(公告)号: US4309752A
    公开(公告)日: 1982-01-05
  • 发明人: Eric J. Stacey
  • 申请人: Eric J. Stacey
  • 申请人地址: PA Pittsburgh
  • 专利权人: Westinghouse Electric Corp.
  • 当前专利权人: Westinghouse Electric Corp.
  • 当前专利权人地址: PA Pittsburgh
  • 主分类号: H02M5/27
  • IPC分类号: H02M5/27 H02P13/30
Cycloconverter apparatus with controllable end stop firing pulse control
means
摘要:
In power conversion apparatus such as a naturally commutated cycloconverter for use in converting the output of a variable speed generator to a constant frequency, there is provided an end stop control circuit for ensuring commutation of power switching devices that includes timing wave generators for both rectification and inversion end stops. The timing wave generators are phase locked with the generator outputs but are controllable by end stop bias signal derived from a variable system parameter that may be independent of the source, such as load current to provide prompt protection against converter malfunctions due to excess load currents.Further provided is an excess current detector employing, for each phase, a pair of high slew rate, high current unipolar output op amps connected in a voltage follower configuration with a common pull-up resistor and a common load capacitor to develop a peak current signal representing the greater of the positive and negative peaks of the alternating phase current.
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