
- Electronics Projects
- 1.5v to 220v AC simple inverter
- Build Simple AM Radio receiver at home
- Simple Uninterruptible Power Supply (UPS) Circuits
- Single Transistor Amplifier Circuit
- 3.7v Lithium Battery Level Indicator
- LED Chaser using transistors
- Electronics Projects for Beginners
- Simple Latch Circuit Using Transistors
- DC to AC Power Converter circuit feature working
- Fire Alarm Circuit using Transistor
- Two Transistor Amplifier
- Laser Security System
- Music Operating Dancing LEDs light
- Volts Booster Circuit Using Ferrite ore transformer
- Touch switch circuit using Transistor
- Two transistor FM transmitter project
- LED Flasher Using Timer IC 555
- DC Voltage Power Supply Using The LM317
- Electronic Mosquito Repellent Circuit
- Light Dimmer Circuit 1000 Watts Using BT139
- Non-Contact Voltage Detector by using transistor
- 4 volts simple inverter project: explanation
- Flashing Police Lights Circuit
- Light Dependent Resistor, its types and applications
- 100 watts inverter circuit working and applications
- Stereo Audio Amplifier 5W Circuit using TEA 2025 IC
- Small High Volts using 2Sc 1815 transistor
- Electronic Doorbell Circuit using a 555 and CD4017
- Touch On Touch Off Switch Circuit Using 555 timer
- LM386 Audio Amplifier Circuit
- IC 4440 Amplifier Circuit
- Neon Lamp Circuits Working and Application
- Low Power Audio Amplifier Using integrated circuit
- Voltage Regulator Circuits using Transistor and Zener Diode
- Water Level Indicator Circuit Using Transistor
- LED Chaser using CD4017 IC
- Motion Sensor Light Switch
- Melody Generator Using IC um66
- Water Level Indicator Using IC
- Led Light to 220v AC
- LiFi Data Transfer System, WiFi vs LiFi
- How to Connect a CAR Battery | Polarity Checker
- Voltage Level Indicator Circuit
- Security Alarm Using PIR Sensor
- Battery Level Indicator Using LM 3914
- Single Transistor FM Transmitter circuit
- Different types of Capacitor
- Light Emitting Diode (LED) Types of LEDs
- Different Types of Relays
- Piezo buzzer features equivalent
- Clap Switch : Circuit and Its Working
- Different Types of diode, working and features
- PC817 Optocoupler Pinout, Equivalent, Features and applications
Simple Uninterruptible Power Supply (UPS) Circuits
In this article, we are going to instigate a simple Uninterruptible power supply (UPS) using a 12V battery. We are going to explain these UPS circuits very simply so that a new electronics student can understand. These UPS circuits can be used for operating a specific appliance or load.
Simple Uninterruptible Power Supply
In this circuit idea, we can build at home using the most ordinary or commonly used components to produce a reasonable output. This simple UPS circuit can be used not only for the usual electrical load but also in complex gadgets like computer supplies. This inverter circuit utilizes a modified sine wave design. UPS power supply features may not be critically required for the operation of sophisticated circuits. This uninterruptible power supply presented here can well suffice the requirement. This inverter circuit includes a Built-in universal battery charger also.
Required Components For the UPS circuit
- IC1= SN74LVC1G132 or a single gate from IC4093
- IC2=4017
- IC3=7805
- R1=20K
- R2,R3=1K
- R4,R5 = 220 Ohms
- C1=0.095Uf
- C2,C3,C4=10UF/25V
- T0 = BC557B
- T1,T2=8050
- T3,T4=BDY29
- TRANSFORMER=12-0-12V/10AMP/230V
Understanding the circuit Design
The IC1 SN74LVC1G132 has a single NAND gate encapsulated in a small package. It is the heart of the oscillator stage and requires just one capacitor and one resistor for the required oscillations. The value of these two passive components determines the frequency of the oscillator and can be changed as u want and this frequency is around 250 Hz.
The generated frequency is applied to the next stage consisting of a single decade counter IC 4017. The IC 4017 is configured so that its outputs produce and repeat a set of five sequential logic high outputs. in this, the input Is a square wave so generated output is also a square wave.
Battery Charger Section for UPS
The base leads of two pairs of Darlington paired high gain, hi-power transistors are attached to the IC such that it receives and conducts to the alternate outputs power.
Since the base voltages to the transistors from the IC are skipped, the resultant square impulse from the transformer carries only 1/2 the average value compared to the other inverters. This dimensioned RMS average power of the generated square waves very much resembles the average value of the mains AC that is normally available at our home power sockets and thus becomes suitable for most sophisticated electronic gadgets.
this uninterruptible power supply design is fully automatic and will revert to the inverter mode the moment input power fails. This is done through a couple of relays; RL2 has a dual set of contacts for reversing both output lines.
Components required for Charger Circuit
- T1,T2,=BC547
- T3=8550
- T4=TIP32C
- T5=8050
- R1,R2,R3,R4,R7=1K
- P1=4K7 PRESET, LINEAR
- R6=SEE TEXT
- RL1=12V/400 OHM, SPDT
- RL2=12V/400 OHM, SPDT, D1—D4=1N5408
- D5,D6=1N4007
- C1=2200UF/25V
- C2 = 1uF/25V
- TR1=0-12V, CURRENT 1/10 OF THE BATTERY AH