Electronic Ballast Circuit Views

• General Goods

An electronic ballast, in simplistic terms, takes a mains supply and transforms the energy to a storage capacitor, which in turn powers a half bridge to provide frequency-controlled power for a fluorescent lamp. Typically, the electronics for this solution are implemented in three different integrated circuits (ICs), which require fabrication in both high-voltage and low-voltage process technologies. A high-voltage (400-V compatible) process is used for the input section, and a low-voltage process is used for the digital control IC. Efficiencies in manufacturing could be made if all three functions

Here is the schematic of another fluorescent ballast circuit from a lamp I acquired along with the 80W electronic ballast. It actually contains a pair of the circuit in the diagram, one for each bulb. The ballast itself is unlabeled, but the chassis sticker calls for 25, 32, or 40 Watt 48s″ type T12 bulbs. [...]

Electronic ballast SINECAN 5 for two fluorescent tubes has identical circuit like most of compact fluorescent lamps. Little differency is in powering tubes before D6 diode and wiring of start capacitors C10 a C11 about tubes. I don't understand exactly why this is wired this way. Ballast doesn't have fuse, but only thin wire. Ballasts was broken due to blowed electrolytic capacitors. It breaks transistors and resistors R3, R4, R5 and R6.

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