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AC power module for automation system

  • US 5,572,073 A
  • Filed: 02/15/1994
  • Issued: 11/05/1996
  • Est. Priority Date: 02/15/1994
  • Status: Expired due to Fees
First Claim
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1. An AC power module for setting the level of power supplied to a plurality of electrical devices according to control signals from a microprocessor comprising:

  • at least one solid state relay coupling one of said plurality of devices to a high voltage AC power supply;

    means for providing a low voltage reference signal having a phase synchronized with said high voltage AC power supply;

    means for adjusting said low voltage signal in accordance with said control signals to provide a relay signal for controlling said solid state relay device, said relay signal determining the level of power supplied to said one of said plurality of devices; and

    means for monitoring power supplied to said one of said plurality of devices, said monitoring means providing a digital signal to said microprocessor which indicates whether current is flowing through said one of said plurality of devices;

    wherein said means for adjusting includes a counter which reads in said control signals from said microprocessor according to a clock pulse supplied by a multiplier circuit, said clock pulse having a frequency which is a multiple of the frequency of said high voltage AC power supply.

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