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Motor driving apparatus

  • US 7,915,853 B2
  • Filed: 11/12/2008
  • Issued: 03/29/2011
  • Est. Priority Date: 10/10/2008
  • Status: Expired due to Fees
First Claim
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1. A system for driving a motor, the system comprising:

  • first and second rectifier circuits configured for receiving a three-phase alternating current (AC) power and for converting the three-phase AC power to direct current (DC) power;

    a DC link circuit configured for receiving the DC power from the first rectifier circuit, wherein the DC link circuit comprises a first storage capacitor, and wherein the DC link circuit is connected to a micro control unit (MCU) for supplying voltage to the MCU;

    an inverter circuit configured for receiving the DC power from the DC link circuit and for converting the DC power to three-phase AC power to control acceleration and deceleration of the motor;

    a voltage booster circuit configured for receiving the DC power from the second rectifier circuit, wherein the voltage booster circuit comprises a second storage capacitor, a boosting switch, and an inductor, first and second terminals of the second storage capacitor are connected to two terminals of the second rectifier circuit, a first terminal of the inductor is connected to the first terminal of the second storage capacitor, a second terminal of the inductor is connected to a first terminal of the boosting switch, a second terminal of the boosting switch is connected to the second terminal of the second storage capacitor and ground, a control terminal of the boosting switch is connected to the MCU; and

    a switch control circuit comprising a first relay and a second relay, wherein a first terminal of a switch of the first relay is connected to the first terminal of the inductor, a second terminal of the switch of the first relay is connected to the DC link circuit, a coil of the first relay is connected to the MCU, a first terminal of a switch of the second relay is connected to a second terminal of the inductor, a second terminal of the switch of the second relay is connected to the DC link circuit, a coil of the second relay is connected to the MCU;

    wherein the MCU outputs a first charging signal to turn on the switch of the first relay and turn off the switch of the second relay so as control deceleration of the motor such that a regenerative current from the motor is charged into the second storage capacitor, wherein the MCU controls the inverter circuit to accelerate the motor when a voltage at the DC link circuit reaches a predetermined value;

    and wherein the MCU outputs a second charging signal to turn on the switch of the second relay and turn off the switch of the first relay, and turn on the boosting switch before the MCU controls acceleration of the motor such that an increased voltage of the a second storage capacitor is charged into the first storage capacitor.

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