Design of single-phase online Uninterruptible Power Supply with power factor correction
This paper present a single-phase online Uninterruptible Power Supply with STM32F103C8T6 as the main control chip.The power supply consists of a transformer,a Power Factor Correction(PFC)circuit,a Buck circuit,a Boost circuit,an inverter circuit and an energy storage device.The municipal power goes through the related circuits and the direct current is output to charge the energy storage device by constant current.The direct current is also input into the inverter circuit to generate the required AC power supply to the load.When power outage,overvoltage,or undervoltage occurs,the energy storage device is controlled and connected to the inverter circuit to achieve Uninterrupted Power Supply.Experimental testing shows that the system has the average output voltage RMS of 29.99 V,the total harmonic distortion of no more than 2.7%at the frequency of 50.00 Hz,the load adjustment rate of 1.60%for AC input,the voltage adjustment rate of 3.69%,and the output efficiency of approximately 89.90%for DC input.In addition,the system can set the charging current through the buttons.
万方数据
维普
