Electronic ballast with modified cathode heating circuit. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Electronic ballasts. Electronic ballast with modified cathode heating circuit. Encyclopedia of radio electronics and electrical engineering

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The next version of the electronic ballast, the scheme of which is shown in Fig. 3.23 has a slightly modified cathode preheating chain. It is formed by elements C7, C8, RK1.

Feature of work lies in the fact that at the initial moment, the low resistance (300 ohms) of the cold posistor RK1 shunts the capacitor C9, and the resonant frequency of the ballast circuit F_б It is determined by the elements L2, C8 in accordance with the formula

F frequency_б lower than the internal oscillator frequency F_г microcircuit, which is given by the elements R3, C4 in accordance with the formula

Under these conditions, the lamp does not light up. The electrodes are heated by the current flowing through C8, RK1. At the same time, the posistor heats up, its resistance increases sharply, and it stops shunting C9. Ballast circuit resonant frequency F_б is now determined by the elements L2 and the serial connection C8, C9. F6 becomes F_г - the lamp lights up. R3 is selected from the condition of ensuring the fulfillment of the equalities described above. Chain C1, C3, L1 - noise suppression.

Rice. 3.23. Electronic ballast with modified cathode heating circuit (click to enlarge)

Author: Koryakin-Chernyak S.L.

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