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Switching converter with pseudo-resonant DC link

  • US 4,965,709 A
  • Filed: 09/25/1989
  • Issued: 10/23/1990
  • Est. Priority Date: 09/25/1989
  • Status: Expired due to Fees
First Claim
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1. A DC to AC converter including an inverter having input terminals and a plurality of controllable switches coupled to said input terminals and adapted to provide regulated output power, and a DC link for coupling a source of DC input power to said inverter, the converter comprising:

  • first controllable switching means in the DC link for selectively coupling DC input power to the inverter input terminals;

    capacitance means coupled to the inverter input terminals in a manner to be charged to the voltage of the DC input power when said first controllable switching means is in conduction;

    second controllable switching means;

    inductive means serially coupled to said second controllable switching means, the series combination of said second switching means and said inductor being connected in a current discharge path with said capacitance means for establishing a pseudo-resonant discharge of said capacitance means; and

    control means for providing gating signals to each of the plurality of controllable switches in the inverter and to said first and second controllable switching means, said control means gating said first controllable switching means out of conduction immediately prior to each time a gating signal is applied to one or more of the controllable switches in said inverter, said control means further gating said second controllable switching means into conduction after gating said first controllable switching means out of conduction and before changing any gating signals to said inverter to force a discharge of said capacitance means and remove input power to said inverter during switching of said controllable switches of said inverter.

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