DC-to-AC voltage conversion circuit and its control method

DC-to-AC voltage conversion circuit and its control method

  • CN 1,421,987 B
  • Filed: 11/22/2001
  • Issued: 06/16/2010
  • Est. Priority Date: 11/22/2001
  • Status: Active Grant
First Claim
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1. a DC-AC voltage switching circuit is electrically connected a direct current voltage, and with this direct voltage conversion output, so that a stable ac output voltage to be provided, it comprises:

  • One power grade transistor switch is electrically connected with this direct voltage, and this power grade transistor switch switches output one first alternating voltage with this direct voltage;

    One choke-condenser filter is electrically connected this power grade transistor switch, and this first alternating voltage is exported this ac output voltage after filtering;

    One current sensor is electrically connected this choke-condenser filter, feeds back an inductive current value of this choke-condenser filter, to produce one first current command signal;

    One voltage feedback controller is electrically connected this ac output voltage, produces one second current command signal;

    One load current sensor is electrically connected an output of this DC-AC voltage switching circuit, and a load current of this output of sensing is to produce one the 3rd current command signal;

    One adder is electrically connected an output of this voltage feedback controller and an output of this load current sensor, and synthetic this second current command signal and the 3rd current command signal are to produce one the 4th current command signal;

    One first subtracter is electrically connected an output of this current sensor and an output of this adder, and synthetic this first current command signal and the 4th current command signal are to produce one the 5th current command signal;

    One current order compensator is electrically connected an output of this first subtracter, and the 5th current command signal is carried out signal compensation, produces one the 6th current command signal;

    AndOne pulse-width modulation produces circuit, is electrically connected an output of this current order compensator, the conversion of the 6th current command signal is produced one trigger drive signal, drives this power grade transistor switch, this direct voltage is switched output produce this first alternating voltage.

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