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Regenerative circuit for motor drive system having leakage current compensation

  • US 5,034,669 A
  • Filed: 06/18/1990
  • Issued: 07/23/1991
  • Est. Priority Date: 10/04/1989
  • Status: Expired due to Fees
First Claim
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1. A regenerative control circuit for an electric motor drive system which includes a rectifying circuit connected to a 3-phase a.c. power source, a main smoothing capacitor connected to the output of said rectifying circuit, and an inverter having an input thereof connected to said main smoothing capacitor and an output thereof connected to an electric motor, said regenerative control circuit comprising:

  • regenerative energy dissipating means connected in parallel to said main smoothing capacitor through a switching element;

    a comparator connected to said switching element and adapted to produce an output signal to drive said switching element;

    a regenerative reference voltage rectifying circuit connected to said 3-phase a.c. power source and adapted to produce a regenerative reference voltage;

    a regenerative reference voltage smoothing capacitor connected to the output of said regenerative reference voltage rectifying circuit; and

    a regenerative circuit including a regeneration transistor for inputting a voltage difference which is created between said main smoothing capacitor and said regenerative reference voltage smoothing capacitor by regenerative leakage current energy, to said comparator after biasing said voltage difference.

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