Day Night Switch (Solid State)

Now a days LED lights are so common everywhere, you can direct connect it with battery no need any UPS / invertor, I decided to installed such power LED light at roof top along day night switch, so I design a simple switch circuit with minimum components, I found it very reliable & stable, a high power FET were used, you don’t worry about the FET you can use any powerful N-Channel FET available in the market which are mostly used in UPS. Heat sink insulation Recommended between FET & heat sink if not no issue . I used FET 47N60C3 ,  LDR,  Variable resistor 305 mega ohms,   Pressure 12 V. Separate heat sinks for both FET & LED are recommended.  

ON/OFF Switch using DPDT relay (220V) & PC mouse

In this circuit one relay & PC mouse were used, no such a electronic circuit were used  , here 2 micro switch & 8 pin DPDT relay 220 v used, if you see the connections of the relay you will see that main AC 220 were connected to points 7 & 8, another wire taken from pin 6 to pin 2 through micro switch (OFF), 2 wires were taken from pins 8 & 2 to the micro switch (ON), Device to be controlled wires are taken from pins 3 & 1.In the presence of 220 AC  if we press ON switch relay will energize while current flow through pin 7 & 2, where current will flow through switch from pin 8 to pin 2  , both 7 & 2 pins are the rely energizing points ,when relay energized it will remain energize due to pin 8 & 6 to pin 2 through micro switch ( OFF ) , because current will flow from pin 8 to pin 6 ( now connected due to relay energized ) .By pressing switch OFF supply will be disconnected between pin 6 & 2, relay will become in normal condition

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Auto Changeover from Inverter / Generator to Mains Supply

Below is the Inverter & mains change over circuit, in this circuit  both Inverter supply & mains supply combined which is called UPS , for this purpose  8 pin DPDT relay (220 V ) were used as explain in the diagram ,

Blue wires are for Inverter ON & OFF switch, in absence of MAINS supply Inverter will be in ON condition (pin 1 connected to 4), as can be see in diagram, 

One of the wire from mains, Inverter & output are kept common,

Pin # 8 is common for 5 & 6 pin, where main connected to pin 6 & Inverter to pin 5.

Green wires to pins 2 & 7 are relay energizing points, where both wires are connected to the mains,

In absence of mains Inverter will be in on condition due to pin 1 & 4 connected, supply from Inverter

Will be available due to pins 5 & 8 connected each other,

In the other hand if  mains supply came relay will be energize due to pins 2 & 7 , pins 6 will connect to 8,

Pin 1 will be disconnected from 4, Inverter will be off.

You use generator instead of Inverter but the Technic is same

Keep in mind that one wire from  mains supply , invertor & output must common 

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