Input rectifying/filtering circuit capacitor board in large power switch power supply

Abstract

The invention relates to an A-typed capacitor plate of an input rectifier / filter circuit in a large-power switch power, consisting of a capacitor cathode plate and a capacitor anode plate; the capacitor cathode plate takes the shape of inverted-U, the upper half part of which has a parallel capacitor, the left lower half part of which is connected with the output cathode of a rectifier bridge and the right lower half part of which is connected with an IGBT cathode; the capacitor plate anode takes the hilt shape, the left folding part of which is connected with a filter resistor, the right lower-half part of which is connected with the IGBT anode; the capacitor cathode plate is connected with the capacitor anode plate by a cushion column. The cathode of the capacitor plate and the anode of the capacitor plate are respectively two copper plates which are superposed upwards and downwards, close to each other, and connected with each other by the cushion column; therefore, the capacitor plate reduces the inductance of the current circuit, overcomes the defects of shortening the service life of the capacitor, increasing the corrugation of output voltage and ESL-induced electromagnetic interference, as the conductive wires with the flat rectangular section have close distance, the corrugated current passing by the capacitor is large, and the heating is severer.

Description

technical field [0001] The invention relates to an A-type capacitor plate of an input rectification / filtering circuit in a high-power switching power supply. Background technique [0002] There are hundreds of high-power switching power supplies (about 80KVA) for the cooling storage ring of the Lanzhou Heavy Ion Accelerator to power the magnets. Under the same power, the switching power supply is more efficient than the linear power supply, the volume is smaller, and the electromagnetic interference is more serious. To achieve this goal, the design of the capacitor plate in the rectification / filtering circuit is the key to high-power switching power supply. [0003] Selection of rectifier filter capacitor: mainly consider the following three aspects: the capacitor value that can meet the expected voltage ripple, the rated voltage of the capacitor, and the rated ripple current of the capacitor. The rectifier filter capacitor is usually an electrolytic capacitor, which has t...

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These two practices will also increase the capacitance of the line

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