Electronic ballast without autostart circuit for the smallest compact fluorescent lamps. Scheme, description

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Electronic ballasts on discrete elements. Electronic ballast without autostart circuit for the smallest compact fluorescent lamps. 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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There is another version of the converter, which is most often used in the most low-power CFLs. The appearance of the board of such a ballast is shown in Fig. 3.38. Its scheme is shown in fig. 3.39.

Electronic ballast without autostart circuit for the lowest wattage compact fluorescent lamps
Rice. 3.38. The appearance of a low-power converter

Electronic ballast without autostart circuit for the lowest wattage compact fluorescent lamps
Rice. 3.39. Low power converter circuit

Home difference from the previous version - no autostart circuit. The self-excitation mode is created here due to the opening of the transistor VT2 by the current through the resistors R2 and R3. Capacitor C5 also contributes to the start, eliminating the DC shunting effect of the base winding on the transistor bias current. If there were no capacitor, then the current flowing through the resistors R2 and R3 could not create a bias voltage on the base of the transistor, which opens the transistor VT2. The low ohmic winding resistance would keep the transistor off, preventing the inverter from starting.

After starting, the capacitor no longer interferes, since it has a low resistance to alternating current.

Author: Koryakin-Chernyak S.L.

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