UPS battery charger and UPS

Abstract

The invention discloses an UPS battery charger. The charger comprises a rectification circuit, a PFC chopper circuit and a BUCK converter, wherein the input end of the rectification circuit is coupled with alternating current input live wire (L), the output end of the rectification circuit is coupled with the input end of the PFC chopper circuit, the output end of the PFC chopper circuit is coupled with alternating current input null line (N) through bus bar, the input end of the BUCK converter is coupled with the bus bar and the output end of the BUCK converter is coupled with a rechargeablebattery. The invention also discloses a UPS with the UPS battery charger. By using the UPS battery charger and the UPS of the invention, larger charging power can be realized by using one BUCK converter, the control method is simple so as to effectively reduce the production cost, and the input voltage of the UPS battery charger is stable.

Description

technical field [0001] The present invention relates to power supply technology, in particular to a UPS (Uninterrupted Power Supply, ie uninterrupted power supply) battery charger and a UPS with the UPS battery charger. Background technique [0002] With the increasing demand for data protection, UPS systems have been used more and more widely. In the UPS system, one of the important parts is the battery charger. The topology selection of the charger, especially the UPS in the small and medium power range (about 10KVA), has an important impact on the cost of the whole machine. [0003] At present, the topological solutions for small and medium power UPS chargers mainly include flyback or forward converters, etc., which take power through input AC, transform and isolate after rectification, and output power to the battery pack. Usually the design power of these conversion devices is relatively small (generally below 500W). If the battery capacity is relatively large and req...

AI Technical Summary

Problems solved by technology

Usually the design power of these conversion devices is relatively small (generally below 500W). If the battery capacity is relatively large and requires a larger charger power (such as above 1KW), the most common method is to use two or more chargers. This kind of device is used in parallel to improve the charging capacity, but the most direct impact of this method is that the cost of the whole machine rises sharply

The fundamental reason is that this charger topology has no cost advantage when outputting high power.

[0004] In addition, since the power is taken directly from the AC, the input of uncontrolled rectification will have a great impact on the input current index of the whole machine.

Although the input current index of the whole machine can be compensated by reducing the input smoothing capacitor of the charger, a new problem is that the ripple current output by the charger to the battery increases, which in turn affects the battery life.

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