Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1981-08-19
1984-04-17
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 98, 363 49, 363 56, H02M 7537
Patent
active
044438443
ABSTRACT:
Two power switching transistors have their emitter and collector connected together respectively. A high level DC voltage is connected across the transistors. The junction of the two transistors is connected by way of a load sensing resistor to a power bus and to the primary of an auxilary transformer. A secondary of the auxiliary transformer is coupled to the input of a transcondance limiting amplifier whose output is coupled to a drive amplifier. The output of the drive amplifier is coupled to the primary of a timing transformer. Two secondaries of the timing transformer are coupled to the two transistors respective for providing drive for the transistors. The auxiliary transformer, transconductance amplifier, drive amplifier, and timing transformer are coupled together in a positive feedback loop forming a high frequency oscillator with the two transistors for converting the DC voltage to a high frequency voltage. A symmetry control circuit is coupled from the secondary of the auxiliary transformer to the output of the transconductance amplifier. A boost transformer is provided having its primary connected across the load sensing resistor and its secondary connected in a series aiding configuration with the primary of the timing transformer.
REFERENCES:
patent: 3683208 (1972-08-01), Burens
patent: 3859583 (1975-01-01), Reed
patent: 4178628 (1979-12-01), Shepard, Jr.
patent: 4348719 (1982-09-01), Hicks et al.
Efflo Incorporated
Wong Peter S.
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