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METHODS AND APPARATUS TO CLAMP OVERVOLTAGES FOR ALTERNATING CURRENT SYSTEMS

  • US 20120050931A1
  • Filed: 08/31/2010
  • Published: 03/01/2012
  • Est. Priority Date: 08/31/2010
  • Status: Active Grant
First Claim
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1. An overvoltage protection circuit, comprising:

  • a first terminal configured to receive an alternating current signal for conversion to a second signal;

    a second terminal to receive the second signal based on the alternating current signal;

    a capacitor in circuit with the first terminal;

    a switch in circuit with the capacitor and the first terminal configured to selectively electrically couple the capacitor to the first terminal based on an overvoltage detection signal to reduce an overvoltage on the second signal; and

    an overvoltage detector in circuit with the second terminal and the switch and configured to determine a signal level of the second signal and, in response to determining that the signal level of the second signal is greater than a threshold, to output the overvoltage detection signal to cause the switch to electrically couple the capacitor between the first terminal and a second terminal.

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