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Electric automobile PWM rectification and converting voltage/current pulse charging system

  • US 9,409,487 B2
  • Filed: 04/13/2012
  • Issued: 08/09/2016
  • Est. Priority Date: 04/18/2011
  • Status: Active Grant
First Claim
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1. A kind of electric automobile PWM rectification and converting voltage/current pulse charging system, comprising:

  • a rectifier module and a charging module, the former linking with an AC network and a charge module respectively, wherein said charging system also includes a DC charging management module and the charging module is composed of a DC input module and a DC output module;

    said rectifier module, DC input module, DC output module and DC charging management module are independent and connected together by a CAN bus;

    the rectifier module rectifies the alternating current of power input and forms the steady DC output voltage after smoothing which is provided to the DC converter module in the subsequent DC output module, in the DC converter module, bi-directional DC-DC converter is employed to realize the multiple modes of charging for the storage battery of the electric automobile, the charging modes include constant voltage limited current charging, constant current limited voltage charging, three-stage charging, intermittent pulse charging and positive and negative pulse charging;

    the rectifier module includes air switch, pre-charge resistor, AC contactor, input-side inductor, three-phase full-controlled bridge converter, PWM rectifier, DC bus capacitor, dummy load, power tube drive and digital logic protection circuit, and control unit;

    the power tube drive chip and drive module and isolated power supply convert PWM pulse signal sent out by the chip in the control unit into the driving IGBT or IPM pulse, and feed back trouble signal to the digital logic protection circuit when the overcurrent occurs on the power devices;

    the AC-side of the PWM rectifier adopts the filter inductance which realizes the control of AC-side unity power factor and four-quadrant operation of the PWM rectifier and filters the AC-side harmonic current of the PWM rectifier;

    the DC input module is managed to meter the DC current, control the DC power supply and secure the DC input and output;

    the DC output communicates with the on-board energy management system, convert the output power, and match up with the voltage and current required by the output battery charging;

    the DC charging module realizes human-computer interaction for interface display, identification, fees charging, receipt printing, data management, current make-and-break current control, and remote monitoring;

    the control unit is composed of the controller and PWM rectifier control panel, the latter is a double closed loop control system formed by inner current loop and outer voltage loop, the double closed loop control system is realized by using the digital regulator, adopts the direct current control for the closed loop control of the rectifier input current and realizes the high precision control of instantaneous current waveform through the current.

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