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Voltage boosting system and method for electronic thermostat relay

  • US 5,957,374 A
  • Filed: 03/17/1998
  • Issued: 09/28/1999
  • Est. Priority Date: 03/17/1998
  • Status: Expired due to Term
First Claim
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1. A microprocessor-controlled thermostat including a microprocessor, a thermostat output relay having an ON state and an OFF state, the ON and OFF states set in accordance with on/off relay set signals from the microprocessor, an electrical power supply coupled to said output relay for providing electrical power to the output relay to enable the output relay to change between ON and OFF states in accordance with the microprocessor on/off relay set signals, said power supply providing a first voltage value and a second voltage value higher than the first voltage value in response to a voltage control signal from the microprocessor, an output relay monitor coupled with the microprocessor for indicating the ON/OFF state of the output relay, wherein if the ON/OFF state of the output relay differs from the on/off relay set signals from the microprocessor, the microprocessor issues a voltage control signal to said power supply to provide the second voltage value to the output relay.

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