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Automatic energy-saving light with LED light control circuit

Past light control circuits are used incandescent load, although used at night, to stop working during the day, one year down the tariff is also very impressive. I made the circuit with eight high brightness white LED, brightness soft, very low power consumption, I think it should be the future direction of development.
How it works:
Circuit diagram shown in Figure 1, the electrical circuit shown in Figure 2. The step-down voltage AC220V C3, R3 discharge, VD1, VD2 rectifier, C2, C1 smooths the DC filter, the voltage regulator diode VD3 in 6V, to MC1455P1G power, and after just a photosensitive resistance power supply. During the day, the light sensitive resistor RG resistance in small, MC1455P1G's feet and input pin high, pin output low, do not pull the relay J2, J1-1 of the contact does not turn, 220V The voltage is not added to the capacitor C5, so LED light does not shine. Night, no light resistance RG photoresistor great, MC1455P1G of feet feet and low, pin output high, pull the relay J, J1-1 of the contact while conducting, C5 are voltage After the buck, R4 discharge to ensure safety, VD5, VD6 rectifier, C6 filtering, VD7 to 15V DC voltage regulator in about the eight white LED lights. Capacitor C4 AC component from the filtered high and low, to prevent interference with the role of household appliances. Discharge resistor R5 is C6.

Component selection and commissioning:
MC1455P1G Semiconductor companies use lead-free packages and 4,098 relays use voltage DC 6V, use light resistance photoresistor RG 1kO, dark resistance 1MO's, C3, C5 selection of high quality polyester capacitors, VD3 ~ VD7 quality selection of Zener diode 0.5W , LED1 ~ LED8 use F5mm high-brightness white LED, single voltage between 3.2V-3.6V, current 16mA - 20mA or so, the remaining components shown in Figure 2. After welding components, the first not to rush to debug, first with a multimeter check to verify the amount, the zero line to distinguish the fire plug in the power, the multimeter appropriated voltage block, measuring VD3 and VD7 compliance requirements, make sure the voltage VD3 = 6V , VD7 = 15V, to debug later. Resistor R1 can be adjusted to determine the potentiometer resistance, may also be replaced with adjustable resistance. Conditioned with something covering the photoresistor RG slowly adjust, pull the relay J, white LED light, and then take down the hood to see the light RG, J does not pull the relay, the circuit does not work behind the LED does not light , the circuit can work after commissioning.

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Automatic energy-saving light with LED light control circuit