Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1985-11-04
1987-07-21
Beha, Jr., William H.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315241S, 363 19, 363131, H05B 4129, H05B 4134
Patent
active
046820817
ABSTRACT:
The converter delivers current to an intermittently energized load and includes a coupled inductor having a primary winding, a secondary winding and a feedback winding. A switching translator is coupled in series with the primary winding of the inductor and switches between conductive and non-conductive states to control the flow of current through the primary winding. A positive drive circuit provides positive bias voltage to the switching transistor. A current limiting circuit senses the base voltage of the switching transistor to measure the primary winding current, removes the positive bias voltage when the primary winding current reaches a predetermined value, and thereby switches the transistor out of the conductive state into the non-conductive state. A negative drive circuit is coupled between the feedback winding and the base of the switching transistor and supplies a constant negative bias voltage to the transistor base as energy is transferred from the inductor into a load. The negative bias voltage remains constant as the voltage across the feedback varies.
REFERENCES:
patent: 3331033 (1967-07-01), Johnston
patent: 3417306 (1968-12-01), Knak
patent: 3504263 (1970-03-01), Schaefer
patent: 3523235 (1970-08-01), Schaefer
patent: 4131843 (1978-12-01), Koyama et al.
patent: 4321507 (1982-03-01), Bosnak
patent: 4330736 (1982-05-01), Perper
patent: 4573112 (1986-02-01), Numata et al.
patent: 4595974 (1986-06-01), Lethellier
patent: 4613797 (1986-09-01), Eggers et al.
Beha Jr. William H.
Tomar Electronics, Inc.
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