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High speed, large-current power control apparatus

  • US 5,637,990 A
  • Filed: 04/26/1996
  • Issued: 06/10/1997
  • Est. Priority Date: 04/27/1995
  • Status: Expired due to Fees
First Claim
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1. A power control apparatus for controlling supply of electrical power to a load, comprising:

  • a switching means for switching a current path between a power supply and the load, the switching means including at least two switching devices connected in series and each switching device having an unsaturated state, in which voltage developed across the switching device increases substantially with increase in current conducted by the switching device, and a saturated state, in which voltage developed across the switching device does not increase substantially with increase in current conducted by the switching device, and the switching means being responsive to a gate signal to change from a conductive state to a non-conducting state,a generating means for generating said gate signal when current through the load exceeds a predetermined value, anda delay means for delaying the gate signal from the generating means by a predetermined period of time to change the switching means to the non-conducting state after all of the switching devices of the switching means are in the saturated state.

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