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Line voltage detection circuit

  • US 9,829,513 B2
  • Filed: 11/20/2014
  • Issued: 11/28/2017
  • Est. Priority Date: 02/17/2011
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a first filter configured tooutput a first signal in response to receiving an input signal,wherein the first signal has a first state in response to the input signal reaching a first threshold voltage on a leading edge of the input signal, andwherein the first signal has a second state in response to the input signal reaching the first threshold voltage on a trailing edge of the input signal;

    a second filter configured tooutput a second signal in response to receiving the input signal,wherein the second signal has the first state in response to the input signal reaching a second threshold voltage on the leading edge of the input signal, andwherein the second signal has the second state in response to the input signal reaching the second threshold voltage on the trailing edge of the input signal; and

    a detection circuit configured to determine, based on times at which the first threshold and the second threshold are reached on the leading edge of the input signal or the trailing edge of the input signal, whether the input signal is received from a triac.

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