Uninterruptible power supply circuit and its control method

Abstract

The invention discloses an uninterruptible power supply circuit and a control method thereof, belonging to the field of power supplies. The circuit includes: a three-arm topology circuit and a bus capacitor connected in parallel between the positive output terminal of the BUS and the negative output terminal of the BUS; and a bidirectional charger circuit connected to the positive output terminal of the BUS and the negative output terminal of the BUS; The charger circuit includes: a first switching tube, a second switching tube, a transformer and an energy storage capacitor; wherein, the energy storage capacitor is connected in series between the positive pole of the battery and the positive output terminal of the BUS, and the negative pole of the battery is directly connected to the negative output terminal of the BUS Connected; the first end of the primary side of the transformer is connected to the positive pole of the battery, the second end of the primary side of the transformer is connected to the BUS negative output terminal through the first switch tube; the first end of the secondary side of the transformer is connected to the positive pole of the battery, The second end of the secondary side of the transformer is connected to the positive output end of the BUS through the second switch tube. The invention improves the multiplexing rate of devices, reduces circuit design redundancy, and achieves the purposes of reducing cost and volume and improving work efficiency.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to an uninterruptible power supply circuit and a control method thereof. Background technique [0002] UPS (Uninterruptiblepowersupply, uninterruptible power supply) system has been widely used in various power supply occasions. The UPS is mainly used to provide uninterrupted power supply for the load. When the mains input is normal, the UPS can stabilize the mains voltage and supply it to the load. At this time, the UPS is an AC mains voltage stabilizer. Charge the internal battery; when the mains power is interrupted, the UPS immediately activates the internal battery, and boosts the power provided by the battery to temporarily supply power to the load. [0003] Please refer to figure 1 , which shows a schematic circuit diagram of a related three-leg topology uninterruptible power supply circuit, the uninterruptible power supply circuit includes: three-leg topology circuit 12, char...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of low circuit integration and device utilization, and large circuit cost and volume in the above technologies, the embodiment of the present invention provides an uninterruptible power supply circuit and its control method

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