Inverter with electrically controllable output

  • US 5,083,255 A
  • Filed: 07/05/1990
  • Issued: 01/21/1992
  • Est. Priority Date: 04/22/1983
  • Status: Expired due to Term
First Claim
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1. A power supply adapted to be powered from the relatively low frequency voltage on a regular electric power line and to provide a relatively high frequency output voltage, comprising:

  • rectifier means connected with said power line and operative to provide a DC supply voltage, said DC supply voltage being characterized by having an instantaneous unidirectional magnitude that is substantially equal to the instantaneous absolute magnitude of said low frequency voltage, whereby said instantaneous unidirectional magnitude increases above a certain threshold level once for each half-cycle of said relatively low frequency voltage and decreases below said certain threshold level once for each of said half-cycles;

    inverter connected with said DC supply voltage and operative to provide said relatively high frequency output voltage, said inverter characterized by;

    i) ceasing operation each time the instantaneous magnitude of said DC supply voltage decreases below said certain threshold level, ii) resuming operation each time after the magnitude of said DC supply voltage has increased above said certain threshold level, but only if provided with a trigger signal; and

    electrically controllable trigger means operable to provide said trigger signal to said inverter some pre-selected time-period after each time the magnitude of said DC supply voltage has increased above said certain threshold level, the duration of said pre-selected time-period being less than that of said half-period;

    whereby, as long as said trigger signals are being provided, said inverter starts and stops operation once during each of said half-cycles, thereby providing said high frequency output voltage for a pre-selected fraction of the duration of each of said half-cycles.

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