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ELECTRIC INJECTION MOLDING MACHINE

  • US 20100102770A1
  • Filed: 11/27/2008
  • Published: 04/29/2010
  • Est. Priority Date: 10/23/2008
  • Status: Active Grant
First Claim
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1. A motor driving circuit for driving a motor, comprising:

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

    a switch control circuit configured for controlling the motor to output a regenerative current in a deceleration period of the motor;

    a heater configured for receiving the regenerative current to heat an external device via the switch circuit;

    a micro control unit (MCU);

    a DC link circuit configured for receiving the DC power from the rectifier circuit, wherein the DC link circuit is configured to be connected to the MCU for supplying voltage to the MCU; and

    an inverter circuit configured for receiving the DC power from the DC link circuit and for converting the DC power to a second three-phase AC power to drive the motor;

    wherein the MCU outputs a heat control signal according to the voltage from the DC link circuit to turn on the switch control circuit, so as control deceleration of the motor such that a regenerative current from the motor is supplied to the heater to operate.

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