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Active inrush current control using a relay for AC to DC converters

  • US 20060274468A1
  • Filed: 06/03/2005
  • Published: 12/07/2006
  • Est. Priority Date: 06/03/2005
  • Status: Abandoned Application
First Claim
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1. An AC to DC power converter having active inrush current control during operational and power disturbance conditions, said converter having two input terminals to which AC power is coupled and two output terminals where the output DC power is provided, comprising:

  • an input rectifier for generating a rectified input voltage from a source of said AC power;

    a boost converter coupled to said rectifier for converting said input voltage to a DC voltage, said boost converter having a first switch, an inductor, and a first diode;

    an output capacitor connected to a first one of said DC output terminals;

    a resistor connected in series between said output capacitor and a second one of said DC output terminals;

    a second switch having a control input and being connected in parallel with said resistor;

    a first control circuit operatively connected to said control input of said second switch for comparing the AC input and DC output voltages of said converter for causing said second switch to enter a conduction state when said AC input voltage exceeds a predetermined threshold and said AC input voltage is less than the DC output voltage;

    a relay connected in parallel with said resistor and said second switch and having a control input; and

    a second control circuit operatively connected to said control input of said relay for causing said relay to enter a conduction state to shunt said second switch and said resistor when the DC output voltage exceeds the peak of said AC input voltage for a predetermined time.

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