Electrical inverters

Details Electrical inverters Electrical inverters

1982-07-16

1983-11-01

Shoop, William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 97, 363131, 363 16, H02P 1300

Patent

active

044133138

ABSTRACT:
An inverter which includes a resonant electrical circuit and a charging transistor arranged to charge an energy storage component of the resonant circuit periodically in synchronism with oscillations in the circuit so as to maintain the oscillations. A part of the oscillatory energy of the resonant circuit is transferred to an output circuit so that the inverter supplies output power.
The charging transistor forms part of a current-limiting switch and is controlled by a control circuit which is arranged to monitor the voltage across the transistor and to switch it on when the voltage lies between first and second limits, one of which preferably is at or near zero, and changing in a predetermined sense, such as to charge the resonant circuit in synchronism with oscillation thereof. The charging transistor then adds energy to the resonant circuit until the current-limit is reached. Charging is then stopped by the switching off of the transistor.
The inverter may include an automatic current-limit adjustment to compensate for output voltage changes and may include also a start-up circuit which operates when the charging transistor has not operated for a set time.

REFERENCES:
patent: 3568038 (1971-03-01), Enders
patent: 3863126 (1975-01-01), Colyn
patent: 4163278 (1979-07-01), Onoue et al.
patent: 4196469 (1980-04-01), Gurwicz
patent: 4253136 (1981-02-01), Nanko
patent: 4276586 (1981-06-01), Boekhorst

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