The UPS may be split into 4 main circuits: Input Power Factor Correction, Battery Boost, Free-Running Chopper, and Inverter. The UPS is an online device which normally will have the Power Factor Correction circuit feeding the Chopper, which then feeds the Inverter. If the input power should be lost, the Power Factor Correction circuit falls out of the power flow and the Battery Boost circuit automatically provides power to the Chopper.
The Inverter is driven by the Inverter Drive circuitry, which in turn is controlled by the Inverter Control circuitry containing the microcontroller.
Basic uninterruptible power supply circuit consist of regular power supply adapter and battery connection. This basic system is a "hot" battery connection, meaning that there is no switching mechanism in connecting and disconnecting the battery, the battery is always connected! This hot connection is very simple to implement and very robust because there would be no switching delay, the output voltage will be 100% continue if a power down happens, until the battery loose its capacity.
This circuit will provide electric power from a backup battery when AC power is cut, always providing a clean 5V power supply for sensitive equipment like microcontrollers and logic circuits.
The value of C1 is to be higher than 220 uF. the bigger the capacitance of this capacitor, the more power you can deliver to your circuits. The 9.6 NiMh Battery can be replaced with any equivalent battery whose voltage is more than 7.5V.
A charger can be constantly connected to the battery from the same 220V source as the rest of the circuit, but depending on the battery and charger type, this procedure can shorten its life.
For a clean transition from AC to Battery operation, especially with microcontrollers, use 10nF decoupling capacitors (ceramic capacitors) as near as possible from the concerned IC.
- PIC Unintteruptible Power Supply
The basic concept of a UPS is to store energy during normal operation (through battery charging) and release energy (through DC to AC conversion) during a power failure.UPS systems are traditionally designed using analog components. Today these systems can integrate a microcontroller with AC sine wave generation, offering the many benefits listed below. Source: Microchip
Download Application Notes and Source Code: PICREF-1 PICREF-1 Firmware PICREF-1 Source Code PICREF-1 Schematic PICREF-1 Board
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To protect yourself from electrical disturbances a UPS is invaluable. A well-designed UPS will keep a computer running for at least several minutes after a power outage enabling you to manually save data that is in RAM and shut down the computer gracefully.
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Thank you for sharing an informative article on UPS.We can store energy with the help of UPS.
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