Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1987-07-17
1989-01-24
Moore, David K.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315241R, 315241S, 315289, 315DIG7, 363 19, 363131, H05B 4129, H05B 4134
Patent
active
048003239
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 transistor 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 voltage across the base-emitter junction 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 semiconductor switch includes a control lead coupled to a voltage divider which applies a scaled voltage to the control lead causing the semiconductor switch to conduct when the switching transistor base-emitter voltage reaches a predetermined current limit voltage representative of a preselected switching transistor collector current limit. The semiconductor switch then shunts the positive bias voltage away from the switching transistor base and switches that transistor into the non-conductive state.
REFERENCES:
patent: 3331033 (1967-07-01), Johnston
patent: 3504263 (1970-08-01), Schaefer
patent: 3523235 (1970-08-01), Schaefer
patent: 4131843 (1978-12-01), Koyama et al.
patent: 4682081 (1987-07-01), Sikora
Moore David K.
Razavi Michael
Tomar Electronics, Inc.
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