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MULTI-LEVEL DC BUS INVERTER FOR PROVIDING SINUSOIDAL AND PWM ELECTRICAL MACHINE VOLTAGES

  • US 20050127853A1
  • Filed: 12/12/2003
  • Published: 06/16/2005
  • Est. Priority Date: 12/12/2003
  • Status: Active Grant
First Claim
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1. A circuit for controlling an ac machine having a stator with stator windings and a rotor, the circuit comprising:

  • a full bridge network of commutation switches which are connected to supply at least one phase voltage to the stator windings;

    a plurality of diodes, each in parallel connection to a respective one of the commutation switches for allowing conduction of current in a reverse direction to bypass each respective commutation switch;

    a plurality of dc source connections for receiving a plurality of incremental dc voltages and for applying a selected sum of said incremental dc voltages to said full bridge network of commutation switches over successive time intervals to approximate a sinusoidal voltage; and

    a controller connected for control of said dc source connections and said full bridge network of commutation switches to output a substantially sinusoidal phase voltage to the stator windings.

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