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Electrical energy conversion systems

  • US 4,255,782 A
  • Filed: 11/15/1977
  • Issued: 03/10/1981
  • Est. Priority Date: 11/15/1977
  • Status: Expired due to Term
First Claim
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1. A power supply unit adapted for connection to a source of alternating current providing an alternating current input signal and adapted to provide an output signal having an increased frequency and a maximum output voltage which is substantially independent of the voltage and frequency of said input signal, said power supply comprising a primary circuit portion, a secondary circuit portion, and a transformer operatively coupling said primary circuit portion to said secondary circuit portion, said transformer including a primary winding and a secondary winding, said primary circuit portion comprising said transformer primary winding, a capacitor, and bilateral switch means in series with said capacitor, said switch means comprising first and second switch elements arranged parallel to each other and having a common input terminal and first and second, non-common output terminals, a flip-flop device having an output terminal connected to each switch element so as to supply an enabling and disabling signal to each of said switch elements, said switch elements each being adapted to pass current in both directions therethrough and each adapted to switch to a conductive state in the conjunctive presence of a first signal responsive to a change in at least one characteristic of said input signal and an enabling signal from said flip-flop, each element being also adapted to switch to a non-conductive state in response to another change in a characteristic of said input signal, said transformer primary winding having one terminal thereof connected to said output terminal of said first switch element and the other terminal thereof connected to the output terminal of said second switch element, said primary winding being tapped and having means connecting said primary winding tap to said capacitor, said first switch element being thereby associated with a first portion of said primary winding and said second switch element being associated with a second portion of said primary winding, said secondary circuit portion including, in addition to said secondary winding, means for connecting the terminals of said winding to an electrical load so as to apply the signal created in said secondary circuit to said electrical load, said primary circuit being arranged so that, in use, said first and second switch elements, under the control of said flip-flop operate so as to alternately energize said first and second primary winding portions when said input signal is positive-going and also to alternately energize said first and second primary winding portions when the said input signal is negative going.

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