Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1983-04-22
1985-03-19
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 98, H02M 744
Patent
active
045063184
ABSTRACT:
An inverter is adapted to be powered from full-wave-rectified unfiltered 60 Hz power line voltage and to provide an amplitude-modulated output of relatively high-frequency voltage. The inverter has to be triggered into oscillation. However, once triggered, it will continue to oscillate--but only for as long as its DC supply voltage is present.
Since the DC supply voltage falls to zero magnitude once for each half-cycle of the 60 Hz power line voltage, the inverter stops oscillating after each such half-cycle; and therefore, for as long as output voltage is desired, the inverter has to be re-triggered after each half-cycle.
Triggering is accomplished by a Diac in combination with an RC integrating circuit; which means that the inverter is triggered into oscillation some time period after the onset of each half-cycle. The length of this time period is determined by the nature of the RC integrating circuit, in the same way as phase-control is accomplished in an ordinary Triac-type incandescent lamp dimmer.
By varying the time-constant of the RC integrating circuit, the inverter can be triggered into oscillation with varying amounts of delay; which means that the net effective RMS magnitude of the output voltage can be adjusted by adjusting the time-constant of the RC integrating circuit.
REFERENCES:
patent: 2968738 (1961-01-01), Pintell
patent: 3267349 (1966-08-01), Krause
patent: 4017785 (1977-04-01), Perper
Jones Judson H.
Wong Peter S.
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