Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1977-03-10
1978-08-01
Shoop, William M.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 56, 363 97, 315DIG5, H02M 5458
Patent
active
041047150
ABSTRACT:
Apparatus is described for converting alternating current at line frequency (50 or 60 Hz) into alternating current of much higher frequency and at a voltage suitable for operating loads such as lamps which draw high starting currents. The apparatus has a current feedback inverter oscillator which may be implemented by switching transistors connected in push-pull relationship through output and feedback transformers which have windings connected in series with the load. The load current is fed back through the feedback transformers so as to self-excite the oscillator at a frequency much greater than the line frequency. A sensing circuit responsive to the current which is fed back provides a control voltage. A clamping circuit is responsive to this control voltage and clamps the voltage at the base of the switching transistors so as to reduce collector peak current within the ratings of the transistors during high peak current draw conditions as occurs during lamp load turn-on. Lamp current gradually increases such that a "soft start" is provided. A trigger circuit which may be in the form of a relaxation oscillator coupled to the feedback transformer assures that the inverter oscillator will begin oscillating immediately upon connection to the load. When the load is disconnected the oscillations stop and the apparatus draws substantially no current.
REFERENCES:
patent: 3243725 (1966-03-01), Raposa et al.
patent: 3327244 (1967-06-01), Fay et al.
patent: 3461374 (1969-08-01), Rhyne, Jr.
patent: 3564384 (1971-02-01), Adler
patent: 3667027 (1972-05-01), Martin
patent: 3701937 (1972-10-01), Combs
patent: 3829794 (1974-08-01), Gautherin
patent: 3959710 (1976-05-01), Hill, Jr.
patent: 4004209 (1977-01-01), Lawson, Jr.
Acme Electric Corp.
Lukacher Martin
Shoop William M.
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