Circuit Diagram of UPS or Uninterruptible Power Supply

Uninterruptible Power Supply(UPS) Circuit Diagram

Here a Circuit Diagram of UPS is given. You can easily make a UPS(Uninterruptible Power Supply) at your Home. It is a very simple UPS circuit diagram. From this UPS you can get two power supplies of different voltages one is a 12V unregulated DC Power supply and another is a 5V regulated DC Power Supply. The UPS can deliver up to 2A current.

Component List:

Components	Rating	Quantity	Indicated In the Circuit diagram
PN Junction Diode	1N4007	7	D1, D2, D3, and in B1
Transformer	230V/12V, 3A	1	T1
Resistors	220 ohm	1	R1
Capacitor	2200 microfarad, 25V	1	C1
Capacitor	100 nano-farad	2	C2, C3
Fuse	2A	2	F1, F2
Resistor	1K	1	R2
Battery	12V	1	Battery
IC7805	IC7805	1	IC1
LED	3V	1	LED1

UPS Circuit Diagram with component rating:

Brief working Principle of UPS:

As you see in the above Diagram a 230V/12V step-down transformer is used. So first 230V AC supply steps down to 12V AC. Then a bridge rectifier using PN Junction diodes is used to convert 12V AC to 12V DC. After the bridge rectifier, a Fuse of 2A is used for protection purposes.

                  Then a Capacitor is connected in parallel for filtering the impure DC into pure DC. An LED is connected through the resistor for indicating purpose. Diode D1, D2, and D3 are connected in such a manner, that when the main supply is available the battery will be charged through diode D2. At the same time, the output supply will be available through the diode D1.

               When the main supply is not available then the battery will provide power to the load through the Diode D3. The Diode D2 will block the reverse power supply from the battery to the transformer. IC7805 is used to provide a 5V DC-regulated power supply at the output. You can use IC7809 to get a 9V DC-regulated power supply. Capacitors C2 and C3 are also used for filtering purposes.

Read Also:

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• Proper UPS Connection with Loads, Inverter, Computer at Home
• Bipolar Output Full Wave Bridge Rectifier with Center Tapped Transformer.
• Transformerless Power Supply Circuit Diagram and Wiring

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