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DC-AC converter for supplementing an AC power source

  • US 4,528,457 A
  • Filed: 02/28/1983
  • Issued: 07/09/1985
  • Est. Priority Date: 02/28/1983
  • Status: Expired due to Fees
First Claim
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1. A DC-AC converter for supplying power from a DC power source to supplement a load circuit that is also supplied power by an AC power source, comprising:

  • switching means operatively connected between the DC power source and the load circuit and controllable to apply the DC power source to the load circuit in either polarity; and

    means for synchronizing the operation of the switching means so that the DC power source is applied to the load circuit with alternating polarity at the frequency of the AC power source;

    said synchronizing means further comprising means to sense the frequency and phase of the AC power source and circuit means operatively connected to the sensing means and the switching means to form control signals for controlling the switching means so that the DC power source is applied to the load circuit during each half cycle of the AC power source between a predetermined on-time and a predetermined off-time that are temporally positioned within the half cycle away from the zero crossings of the half cycle.

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