A DC uninterruptible power supply

Abstract

The invention provides a direct-current uninterruptible power supply. The direct-current uninterruptible power supply comprises a diode rectifier bridge, a flyback converter 1, a flyback converter 2, a switching circuit, a charging circuit and a storage battery, wherein the diode rectifier bridge rectifies alternating current into direct current and provides the direct current to the flyback converter 1; the direct-current input end of the flyback converter 1 is connected with a direct-current energy storage capacitor C1 through a diode D1; and the flyback converter 1 has two paths of output; the first path of output is subjected to rectifying and filtering to output direct-current voltage and the second path of output charges the storage battery through the charging circuit. The direct-current uninterruptible power supply can obtain a stable direct-current power supply at the output end through the work of the flyback converters; the two flyback converters are output by the same high-frequency transformer, so that the direct-current uninterruptible power supply is only subjected to single-stage power conversion to output direct-current electric energy no matter alternating current or the storage battery supplies power, the conversion efficiency of the power supply is improved, the circuit structure is simplified, and quick switching between alternating current power grid power supply and storage battery power supply is realized through the switching circuit.

Description

technical field [0001] The invention relates to a switching circuit between AC grid power supply and storage battery power supply, in particular to a DC uninterruptible power supply. Background technique [0002] At present, the connection method between the DC power supply and the battery generally adopts AC / DC rectifiers for AC-DC conversion to provide charging power for the battery. Since the battery is directly used as a DC output, the quality of the output power is not high. The subsequent stage generally uses a DC / DC converter output to provide DC stable power. . When the AC input power is cut off, the battery outputs DC stable power through this stage of DC / DC converter. The advantage of this circuit connection is that the AC / DC conversion is realized through the AC / DC converter, which replaces the previous power frequency transformer and reduces the size and weight. However, when the power supply is powered by AC input, there are disadvantages such as multi-stage p...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a DC uninterruptible power supply, which solves the problem that the DC uninterruptible power supply only outputs DC power through single-stage power conversion, improves the power conversion efficiency, and simplifies the circuit structure no matter whether the AC power supply or the battery power supply

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