Circuit as shown. L1 into the electricity through the full bridge rectifier VD1 ~ VD4 added later on in the thyristor VT, VT of the conduction angle control by BT33. BT33, C, R1, R2, R3, and KP form a relaxation oscillator, changing the KP can change the oscillation period.
When the mains voltage increases, the increase in the voltage corresponding increase in BT33, oscillation speed up, VT conduction angle decreases, VT on the voltage increases, so that the voltage on L1 change; voltage drop on the other hand when the VT The voltage on L1 is still the same; so the voltage through the coupling of L2 will remain constant. As a result of full-bridge rectifier, L1, L2 is the voltage on the sine wave.
VD1 ~ VD4 and VT on the current selected according to the capacity of the transformer and have a large margin, the pressure should be in the 600V or more. R1, R2 3W resistor selection, KP the best selection of more than 2W adjustable resistance.
Have you component type on L1/L2. From what I see, I think using two inductor, it will be convenient?
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