Block diagram of electronic ballast. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Electronic ballasts. Block diagram of electronic ballast. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ballasts for fluorescent lamps

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Consider the principle of operation of a simple electronic ballast on the example of the IR2153 chip. On the block diagram of the electronic ballast (Fig. 3.13), point "A" is connected using keys Kl1 and Kl2 to the supply voltage (U_п = +310 V), then to the common wire. The keys, recharging the capacitor, form a portable voltage. As a result, unipolar high-frequency voltage pulses occur at point "A" (the switching frequency is usually in the range of 30-100 kHz), which, firstly, light the lamp, and, Secondly, keep the gas from deionizing (no flicker).

With this method of start-up and control, completely false start ruled out, since the lamp is guaranteed to be switched to a constant voltage, the dips of which are fundamentally absent. The dimensions of the inductive element are reduced. By adjusting the duty cycle (or phase) of the switching pulses, you can achieve a change in the brightness of the glow.

Rice. 3.13. Block diagram of electronic ballast (click to enlarge)

Author: Koryakin-Chernyak S.L.

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