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DC-to-DC converter capable of preventing overvoltage

  • US 6,046,896 A
  • Filed: 08/09/1996
  • Issued: 04/04/2000
  • Est. Priority Date: 08/11/1995
  • Status: Expired due to Term
First Claim
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1. A synchronous rectification type DC/DC converter comprising:

  • a storage unit storing therein power derived from a power supply;

    a first switch element, provided between said power supply and said storage unit, connecting/disconnecting the storage unit to/from the power supply;

    a second switch element, provided between the ground and a connecting point of said first switch and said storage unit, connecting/disconnecting said connecting point to/from the ground;

    a control unit controlling the connecting/disconnecting operations of said first switch element and said second switch element so as to maintain a voltage outputted from said storage unit at a predetermined value;

    an overvoltage detecting unit monitoring an input voltage derived from said power supply and outputting a signal when said input voltage derived from said power supply exceeds a preselected voltage value;

    a shortcircuiting unit bringing said first switch element and said second switch element to connecting conditions when the signal from the overvoltage detecting unit is inputted therein, whereby the voltage derived from said power supply is shortcircuited; and

    an interrupting unit interrupting input power of said power supply by the power shortcircuited by said shortcircuiting unit.

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