Control circuit for drive circuit of an electronic ballast for a

Details Control circuit for drive circuit of an electronic ballast for a Control circuit for drive circuit of an electronic ballast for a

1993-09-16

1995-04-25

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315291, 315307, 315362, 315216, 315144, 315DIG5, 315DIG7, H05B 3702

Patent

active

054102200

ABSTRACT:
The invention relates to an electronic ballast for a discharge lamp, comprising a drive circuit supplying high-frequency current to the lamp and including two power switches (V1, V2) and control circuits therefor for controlling the power switches, such that the parallel half-waves of the lamp current pass through a first power switch (V1) and the reverse half-waves through a second power switch. Each power switch (V1; V2) is provided with its own, independently operating control circuit and each control circuit is provided with means (R1, R3, R8, R7) for sensing a current passing through and a voltage prevailing across the appropriate power switch (V1; V2) as well as with means (V3; V4) for controllably bringing the appropriate power switch (V1; V2) to a conducting state as a certain voltage prevails thereacross and to a non-conducting state as soon as a current passing therethrough reaches a certain threshold value (Ik; Ikl).

REFERENCES:
patent: 4237403 (1980-12-01), Davis
patent: 4277728 (1981-07-01), Stevens
patent: 4370600 (1983-01-01), Zansky
patent: 4553070 (1985-11-01), Sairanen

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