This circuit can implement four times of the power supply for the fluorescent lamp to start, so it is easy to start, especially suitable for waste recycling of broken wire lamps.
The circuit is shown below. When the A terminal is positive and the B terminal is negative, the current path is A→L→C2→D4→B, so that C2 is charged to the mains peak voltage. When the B terminal is positive and the A terminal is negative, the current path is B→D3→C1→L→A, so that C1 is charged to the mains peak voltage. At the same time, when A is positive and B is negative, the mains and the voltage on C1 are added in series through D5 to charge C3 to twice the mains peak voltage; when B is positive. When A is negative, the mains and the voltage on C2 are added in series through D6 to charge C4 to twice the mains peak voltage. Therefore, the lamp ends at four times the mains peak voltage and lights up. After the fluorescent lamp is lit, the mains supply power to the lamp through the bridge. Due to the current limiting action of the bulb L, the voltage across the lamp is reduced to a normal working voltage of about 110V. Here, the bulb as a current limiting resistor can double as auxiliary lighting, without wasting power, and a 40W bulb with a 100W bulb is suitable. R1 to R4 are the bleeder resistors of the capacitor.
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