Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1979-10-31
1982-03-09
Shoop, William M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363132, H02M 112
Patent
active
043193161
ABSTRACT:
Power supply apparatus is disclosed including an inverter, such as a half-bridge inverter, and control means for controlling the frequency of operation of the inverter. The control means includes a further control winding on the transformer of the invertor, and means for applying a short circuit of one or other or both polarities to the control winding in order to activate a switching transition of the inverter. In one embodiment, the control means is used to fix the frequency of operation of a free-running inverter; in another embodiment, short circuits of both polarities are applied to the control winding for an overlap period in order to provide a "dwell" period between switch-off of one inverter transistor and switch-on of the other, this method of operation providing pulse width modulation control of the output waveform of the inverter.
REFERENCES:
patent: 3361952 (1968-01-01), Bishop
patent: 3667027 (1972-05-01), Martin
patent: 3683208 (1972-08-01), Burens
patent: 4199807 (1980-04-01), Crowe et al.
Farrer Michael
Perryman Raymond A. G.
Gould Advance Limited
Shoop William M.
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