A double-input switch power supply

Abstract

The invention relates to a switch power supply, and specifically relates to a double-input switch power supply. A first processing unit converts first electric energy outputted from a first feeding terminal into first predetermined electric energy and outputting the first predetermined electric energy after the first predetermined electric energy passes testing performed by a first detecting unit; a second processing unit converts second electric energy outputted from a second feeding terminal into second predetermined electric energy and outputting the second predetermined electric energy after the second predetermined electric energy passes testing performed by a second detecting unit; and a converting unit receives the first predetermined electric energy and / or the second predetermined electric energy and outputs a converted electric energy signal formed according to the first predetermined electric energy and / or the second predetermined electric energy.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a dual-input switching power supply. Background technique [0002] In some applications with high reliability requirements, such as power system substation relay protection power supply, the switching power supply uses two isolated AC power sources as input to meet the redundant hot backup requirements of the input AC power supply. The two AC input voltages come from two different distribution transformers, and their AC phases and amplitudes are different. Therefore, the electrical insulation requirements between the two AC inputs and the output of the switching power supply must be met. Such as figure 1 As shown, the structure diagram of an existing dual-channel AC input switch circuit, the dual-channel AC input switch power supply has a power frequency transformer, a high-frequency converter, the first AC input voltage passes through the first rectifier, the first diode Connected t...

AI Technical Summary

Problems solved by technology

The parallel circuit architecture of the dual switching power supply has the advantage of high power density due to the abandonment of the power frequency transformer. However, it also has two disadvantages: one is the need for two sets of high-frequency converters, including two sets of control circuits and two sets of power circuits. , two high-frequency transformers, which will bring about an increase in cost; second, because the input voltage is generally much higher than the output voltage, the positions of the first diode and the second diode are changed to the output side, and the flow through The current of the two diodes is greatly increased, which will result in a loss of efficiency

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