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Device for remote control of electrical power units

  • US 4,024,502 A
  • Filed: 10/23/1975
  • Issued: 05/17/1977
  • Est. Priority Date: 10/23/1974
  • Status: Expired due to Term
First Claim
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1. An apparatus for remote control of an electrical appliance, consisting of a transmitter for producing an optical signal and a receiver for controlling an electronic control circuit of said electric appliance in response to the optical signal,the transmitter comprising a number of keys and a multivibrator including an equal number of pairs of control elements selectively actuable by said keys to determine the frequency of said optical signal, andthe receiver comprising a photo-electric element for transforming the optical signal into electrical pulses, a band pass filter connected to said photo-electric element for filtering said electrical pulses, means connected to said filter for shaping said electrical pulses, a frequency divider circuit connected to said shaping means for producing one pulse for each given number of said electrical pulses, a counter circuit connected to said divider circuit for producing an output signal indicating the number of pulses produced by said divider circuit in a given time and hence the frequency of said optical signal, a 1-out-of-n decoder connected to the output of said counter circuit for producing a decoded signal indicating said frequency, a timer circuit connected to said counter circuit for producing a periodic timer signal for resetting said counter circuit at the end of said given time, and means for comparing the output of said decoder with the output of said timer circuit and producing a control signal applied to said electronic control circuit.

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