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High-voltage protection circuit, high-voltage protection method and power supply

  • US 9,343,951 B2
  • Filed: 07/29/2013
  • Issued: 05/17/2016
  • Est. Priority Date: 10/31/2012
  • Status: Active Grant
First Claim
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1. A power supply, comprising a high-voltage protection circuit, a rectifier circuit, an electrolytic capacitor, a Direct Current (DC-DC) conversion circuit, a secondary power supply, an electrolytic capacitor voltage detecting circuit, a secondary relay controlling circuit, a primary relay controlling circuit, and an Alternating Current (AC) input voltage detecting circuit, whereinthe high-voltage protection circuit is configured for performing high-voltage protection on the power supply;

  • the high-voltage protection circuit comprises a primary relay, a secondary relay, a first resistor, a second resistor, a first capacitor, and a second capacitor, whereinone end of the primary relay is connected to an input port of a live line, the other end of the primary relay is connected to an output port of the live line;

    one end of the secondary relay is connected to the input port of the live line, the other end of the secondary relay is connected between the first resistor and the second resistor;

    one end of the first capacitor is connected to the output port of the live line, the other end of the first capacitor is connected to a neutral line connected in parallel with the live line;

    the second capacitor is connected in parallel with the primary relay; and

    the second resistor and the first resistor are connected in series between the input port of the live line and the output port of the live line,the primary relay controlling circuit is configured for opening and closing the primary relay in the high-voltage protection circuit;

    the secondary relay controlling circuit is configured for opening and closing the secondary relay in the high-voltage protection circuit;

    the output end of the high-voltage protection circuit is connected to an input end of the rectifier circuit, the electrolytic capacitor is connected between an output end of the rectifier circuit and an input end of the DC-DC conversion circuit;

    an output end of the secondary power supply is connected to a relay in the high-voltage protection circuit, the AC input voltage detecting circuit, the primary relay controlling circuit, the secondary relay controlling circuit, and the electrolytic capacitor voltage detecting circuit.

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