Multi-input power converter, control method thereof and uninterruptible power supply comprising multi-input power converter

Abstract

The invention provides a multi-input power converter, a control method thereof and an uninterruptible power supply comprising the multi-input power converter. The multi-input power converter comprisesa first capacitor and a second capacitor which are connected in series between a positive direct current bus and a negative direct current bus, an I-type neutral-point clamping converter assembly, analternating current switch assembly and a first direct current switch assembly, wherein a node formed by connecting the first capacitor and the second capacitor is a neutral point; the I-type neutral-point clamping converter assembly comprises a first I-type neutral-point clamping converter and a second I-type neutral-point clamping converter which are connected in parallel between the positive direct current bus and the negative direct current bus; the alternating current switch assembly is connected between the input end of the I-type neutral-point clamping converter assembly and alternating current; and the first direct current switch assembly is used for switching on or switching off a rechargeable battery for selective power supply / charging and is connected between the input ends ofthe first I-type neutral-point clamping converter and the second I-type neutral-point clamping converter and the two ends of the rechargeable battery. According to the multi-input power converter, bidirectional flow of energy can be realized, power soft switching is realized, and the cost is low.

Description

technical field [0001] The invention relates to a power converter, in particular to a multi-input power converter, a control method thereof and an uninterruptible power supply including the same. Background technique [0002] The uninterruptible power supply can continuously supply power to the load. When the mains voltage is normal, the mains supplies power to the load; when the mains voltage is abnormal or there is a power failure, the rechargeable battery supplies power to the load. Currently uninterruptible power supply has been widely used in various fields. [0003] figure 1 It is the circuit block diagram of the first uninterruptible power supply in the prior art. Such as figure 1 As shown, the uninterruptible power supply 1 includes a rectifier circuit 13, a power factor correction circuit (PFC) 14 and an inverter 15 sequentially connected between the AC input terminal 11 and the AC output terminal 12; and a charger 16 and a rechargeable battery 17 and switchgear...

AI Technical Summary

Problems solved by technology

However, the sum of the power of the pulse width modulation rectifier circuit 23 and the bidirectional DC-DC converter 26 is twice the output power, thus increasing the cost of electronic components

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