Output filter circuit suitable for large current output electrochemical industrial power supply

Abstract

The invention provides an output filter circuit suitable for a large current output electrochemical industrial power supply. One output end of a rectification output module of the power supply is connected with one end of a first inductor and one end of a fourth inductor; the other end of the first inductor is connected with one end of a third inductor and one end of a load; the other end of the fourth inductor is connected with one end of a second capacitor; the other end of the second capacitor is connected with the other end of the load and one end of a second inductor; the other end of the third inductor is connected with one end of a first capacitor; and the other end of the first capacitor and the other end of the second inductor are together connected to the other output end of therectification output module of the power supply. In the invention, the problem of excessively large ripples, which is caused by a filter capacitor and a lead parasitic inductor thereof, of an output voltage in the large current output places is solved, so that a direct current (DC) output high-frequency switch power supply can realize zero-ripple output. Therefore, the output filter circuit is very suitable for the DC large current output power supply in the electrochemical industries of electrolysis, electroplating and the like.

Description

technical field [0001] The invention relates to the technical field of output filtering of a high-frequency switching power supply whose output is direct current, in particular to an output filtering circuit suitable for large-current output electrochemical industrial power supplies. Background technique [0002] At present, the high-frequency switching power supply whose output is DC generally uses a single-stage LC filter circuit in the output filter link, that is, the main circuit series inductors and parallel capacitors to filter out high-frequency ripples (such as figure 1 ). When the output current is small, the voltage fluctuation on the equivalent series inductance of the filter capacitor itself and the capacitor lead inductance (hereinafter referred to as parasitic inductance) is relatively small, so the influence of the parasitic inductance is not obvious, and a single-stage LC filter circuit can be used. Get a satisfactory filtering effect. However, in the case ...

AI Technical Summary

Problems solved by technology

However, in the case of high current output, the voltage fluctuation on the parasitic inductance is greatly increased, and its negative impact becomes more and more obvious

At this time, it is difficult to obtain an ideal filtering effect by using the LC filter circuit alone.

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