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Start winding switch protection circuit

  • US 5,103,154 A
  • Filed: 05/25/1990
  • Issued: 04/07/1992
  • Est. Priority Date: 05/25/1990
  • Status: Expired due to Fees
First Claim
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1. A single phase AC induction motor comprising a main winding and an auxiliary winding both connectable to an AC power source, a start capacitor for providing a phase shifted field, auxiliary winding switch means for connecting and disconnecting the start capacitor and auxiliary winding to and from the AC source, auxiliary winding switch protection means including a gated semiconductor switch serially connected to a discharge resistor coupled across the auxiliary winding switch and a voltage breakdown device connected to the semiconductor switch and connected to be directly responsive to the voltage across the auxiliary winding switch, the breakdown device selected to breakdown at a voltage level to prevent excessive voltage appearing across the auxiliary winding switch.

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