Abstract
In this paper a capacitor step-down regulated power supply based on current conduction angle adjustable mode is proposed. The circuit of capacitor step-down regulated power supply has simple structure, low cost, output short circuit and less loss, it is widely used in driving power supply with small power. But the conventional capacitor step-down power supply has no voltage stabilizing, it cannot work between wide voltage ranges from 180V to 260V. This power can drive LED lamp group which power range is from 5W to 20W. It has less EMI, stable work, low cost and simple maintenance.
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