Module of suppressing inrush current, method of controlling the same and on-board bidirectional charger using the same

  • US 11,088,538 B2
  • Filed: 05/07/2019
  • Issued: 08/10/2021
  • Est. Priority Date: 05/09/2018
  • Status: Active Grant
First Claim
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1. A method of controlling a module of suppressing inrush current used in an on-board bidirectional charger, wherein:

  • the on-board bidirectional charger comprises a PFC-inverter module configured to convert an AC power into a DC power or convert the DC power into the AC power, the PFC-inverter module is connected to an AC input, a positive DC bus and a negative DC bus of the on-board bidirectional charger, and the PFC-inverter module comprises a bus capacitor connected between the positive DC bus and the negative DC bus; and

    the module of suppressing inrush current is connected in series with the bus capacitor between the positive DC bus and the negative DC bus, and the module of suppressing inrush current comprises a controlled switch and a suppressor of suppressing inrush current connected in parallel with the controlled switch, andthe method comprises;

    controlling the on-board bidirectional charger to receive an AC input power and charge the bus capacitor by a limited current through the suppressor of suppressing inrush current, wherein the controlled switch is in an off-state during the charging;

    when a voltage of the bus approaches a peak value of a voltage of the AC input power, turning on the controlled switch;

    controlling the PFC-inverter module to charge the bus capacitor by a constant current of a first AC current protection limit; and

    when the voltage of the bus approaches a set voltage, increasing the first AC current protection limit to a normal operation limit, and charging a voltage of the bus capacitor to the set voltage.

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