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Electronic control for a dishwasher

  • US 5,202,582 A
  • Filed: 07/25/1991
  • Issued: 04/13/1993
  • Est. Priority Date: 07/25/1991
  • Status: Expired due to Fees
First Claim
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1. A control circuit for an appliance, said appliance including a cabinet having an access opening therein for providing access to the interior of said cabinet, an access door movable between open and closed positions for selectively opening and closing said access opening, and electrical components for performing a plurality of operations, said appliance adapted to be connected to a source of electric power, said source of power having a grounded side and an ungrounded side, said circuit comprising:

  • a power supply including means for connection to the source of electric power, and including means for electrically isolating an output side of said power supply from the source of electric power;

    a microprocessor connected to said power supply, said microprocessor including means for controlling said appliance during a cycle of operations;

    a door switch including means for mounting said switch on said appliance, said switch connected to said electrical components for disabling operation of said components when said door is in the open position and for enabling operation of said components when said door is in the closed position, said switch including only two contacts and means for bridging said contacts, one of said contacts being connected to the grounded side of the source of electric power;

    conditioning circuit means for conditioning a voltage signal and including means for connection to the ungrounded side of the source of electric power and connected to the other of said switch contacts and to said microprocessor for providing an indication input to said microprocessor regarding the condition of said door switch.

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