Method and circuit for realizing isolation of alternating current and direct current of double inverse uninterruptable power supply

Abstract

The invention relates to the field of an inverse uninterruptable power supply (UPS), in particular to the realization of the isolation technology of alternating current and direct current of the double inverse uninterruptable power supply. The method and circuit for realizing isolation of alternating current and direct current of the double inverse uninterruptable power supply is used for carrying out electrical isolation on the alternating inverse circuit with alternating current input and the direct inverse circuit with current circuit input, wherein the alternating input power supply (1221) passes through the rectifying circuit (121) and an alternating current inverter (122), is sent to the first primary winding (P1) of an output isolation transformer (T5) and is output via the secondary winding (S) of the output isolation transformer (T5) in a coupled manner to constitute an alternating inverse channel; the direct current input power supply (2221) passes through an inverted device (221) and a direct current inverter (222), is sent to the second winding (P2) of the output isolation transformer (T5) and is output via the secondary winding (S) of the output isolation transformer (T5) to constitute the direct current inverse channel.

Description

technical field [0001] The invention relates to the field of inverter uninterruptible power supplies (UPS), in particular to a technology for realizing AC-DC isolation of double inverter uninterruptible power supplies. Background technique [0002] Uninterruptible power supply (UPS) is a stable, pure, uninterrupted high-quality power supply. With the rapid development of information technology and the wide application of computers, it has become an indispensable power supply device in power control systems. In the entire power control system, the backup DC power of the UPS is taken from the DC bus in the DC system; at the same time, in order not to increase the working pressure of the high-frequency rectifier module on the DC bus, the UPS uses the power of the AC grid when it works normally. The power grid is switched to the DC bus for power supply (that is, the UPS is not working in a pure inverter state). The DC system is responsible for providing reliable working power f...

AI Technical Summary

Problems solved by technology

At present, the solution commonly used in the industry is to add an input isolation transformer to the AC input end of the UPS; although this solution is simple to implement and requires little modification to the UPS, it also has several disadvantages: 1. The transformer is large in size and heavy. Heavy

2. There is a problem of conversion efficiency; since the efficiency of the isolation transformer is generally between 92% and 95%, the efficiency of the UPS will decrease; at the same time, the lost energy will be dissipated in the form of heat, giving The heat dissipation system of the whole machine brings a certain pressure

3. Higher cost

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