Three-phase medium-frequency DC high-voltage power supply for ESP

Abstract

The invention comprises: a variable current main circuit, an interface circuit and a power intelligent control circuit. Said variable current main circuit comprises a three-phase power input control circuit, a three-phase full-wave rectification circuit, a filter circuit, a inverter circuit, a three-phase higher harmonic filter circuit, and a three-phase intermediate frequency transformer. The a three-phase power frequency AC power is inputted to the three-phase power input control circuit, and is filtered and rectified by the three-phase rectification circuit and filter circuit to get DC voltage which is sent to the inverter circuit; after high frequency inversion and filter, a intermediate frequency voltage is obtained; the intermediate frequency voltage is boosted and filtered by the intermediate rectification transformer to get a DC voltage which is inputted into the both ends of the load.

Description

technical field [0001] The invention relates to a power supply, in particular to a three-phase medium-frequency DC high-voltage power supply for ESP. Background technique [0002] Electrostatic precipitator (ESP for short) is an important equipment in the field of environmental protection. It is mainly used in plasma discharge, dust removal, fog removal, dehydration, air purification, high-efficiency dust removal and desulfurization, separation of impurities and recovery of various raw materials. [0003] The high-voltage electric field of ESP is equivalent to a parallel load of R and C, where C is the equivalent capacitance of the high-voltage electric field, generally thousands to tens of thousands of PF, and R is a variable resistor, which changes at any time with the ESP working conditions. It can be seen that ESP is a variable load, and when a flashover or short circuit occurs, it will have a great impact on its DC high-voltage power supply. Therefore, corresponding mea...

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Problems solved by technology

[0007] (2) AC phase-shift control makes the harmonics on the grid side serious, and the use of two-phase power supply is an unbalanced load for the grid;

[0015] The disadvantage is that the volume of the intermediate frequency transformer with the same capacity is larger than that of the high frequency power supply, but the requirements for the core material and wire package are lower than that of the high frequency power supply

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