PHOTOCOUPLED ISOLATED SWITCHING AMPLIFIER CIRCUIT
 Inventor: James R. Collins, Fort Wayne, Ind.
 Assignee: General Electric Company, Carmel, Ind.
 Filed: Mar. 23, 1976  Appl. No.: 669,380
Related U.S. Application Data
[ 62 ] Division of Ser. No. 568,237, April 15, 1975, Pat. No. 3,976,932.
 U.S. CI 323/21; 307/311
 Int. CI.2 G05F1/64
 Field of Search 323/21; 307/278, 311;
 References Cited
UNITED STATES PATENTS
3,691,403 9/1972 Newmeyer 307/31IX
3,881,118 4/1975 Forrest et al 307/311 X
3,890,559 1/1975 Kuster 321/21
3,917,962 11/1975 Pascente 307/31IX
3,958,175 5/1976 Braun 323/21
Electronics Nov. 23, 1970, vol. 43, No. 24, p. 68, "Optoelectronic Switch Monitors Line Power" by J. van Zee.
Primary Examiner—Gerald Goldberg
A switching transistor inverter circuit for driving high power AC loads such as arc discharge lamps from a DC electrical energy source. Each switching transistor is included in a switching amplifier whose response time is short as compared with the response characteristic of the load and the AC cycle period. A single driver circuit is coupled to the respective switching amplifiers by photocouple isolation means through an electrooptically coupled light emitter-sensor pair. A clock pulse generator provides the necessary signal to the driver circuit which includes a phase splitter driver. A twostage amplifier receives the signal from the sensor transistor of the photocouple and amplifies it to drive the switching transistor which is, in the preferred embodiment, a power darlington device of the monolithic type.
8 Claims, 10 Drawing Figures