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Universal input dimmer interface

  • US 5,751,118 A
  • Filed: 07/07/1995
  • Issued: 05/12/1998
  • Est. Priority Date: 07/07/1995
  • Status: Expired due to Term
First Claim
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1. A universal input dimmer interface circuit adapted for receiving a plurality of input waveforms comprising:

  • direct current modulator means for providing as an output a first pulse train, the first pulse train having pulse widths proportional to the magnitude of a direct current signal;

    a pulse width modulated input demodulator;

    a pulse width modulated input signal conditioner connected to the output of the pulse width modulated input demodulator;

    a pulse width modulated input modulator connected to the output of the pulse width modulated input signal conditioner such that a pulse width modulated signal is inverted, the pulse width modulated input modulator having as an output a second pulse train;

    a zero input detector for providing a zero input signal in response to the input waveforms being absent;

    direct current disabler means for disabling the direct current modulator means in response to a first disabling signal from the pulse width modulated input demodulator;

    pulse width modulated disabler means for disabling the pulse width modulated input demodulator in response to a second disabling signal from the direct current modulator means; and

    demodulator means for converting either the first pulse train or the second pulse train into a control signal, the demodulator means converting the first pulse train into the control signal when the pulse width modulated input demodulator is disabled, the demodulator means converting the second pulse train into the control signal when the direct current modulator means is disabled,whereby the control signal is generated from the input waveforms.

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