Eliminator for parasitic inductance of smoothing capacitor

Abstract

The invention provides an eliminator for parasitic inductance of a smoothing capacitor, which comprises a printed circuit board (401), and an upper layer plane helical coil (402) and a lower layer plane helical coil (403) which are arranged on the printed circuit board (401). The upper layer plane helical coil and the lower layer plane helical coil are formed by connecting im semi-circular PCB windings end to end of which semi-diameters are increased successively; the semi-circular PCB windings with the same semi-diameter are symmetrical about mirror image, so that the upper layer plane helical coil and the lower layer plane helical coil are in staggered arrangement; the upper layer plane helical coil is connected in series with the lower layer plane helical coil through a through hole E which is formed on the printed circuit board (401) to form an orthodromic coupled structure, namely, the directions of currents in the upper layer plane helical coil and the lower layer plane helical coil are the same. The through hole E is also used for accommodating a pin of the capacitor; the values of mutual inductance and the parasitic inductance are the same by controlling the number of the semi-circular PCB windings in the upper layer plane helical coil and the lower layer plane helical coil according to the parasitic inductance value of the capacitor.

Description

Technical field [0001] The invention relates to a device for eliminating parasitic parameters of components, in particular to a device for eliminating parasitic inductance of a filter capacitor. Background technique [0002] The capacitor works under high frequency conditions, and its equivalent model is determined by its own capacitance C 11 , Equivalent inductance L 11 And equivalent resistance R 11 Series composition, such as figure 1 Shown. Due to the presence of parasitic inductance, resonance occurs on the capacitor branch, and the impedance characteristic above the resonance frequency is inductive, which makes the bypass effect of the capacitor on high-frequency noise abruptly reduced, thereby reducing the high-frequency performance of the capacitor. [0003] In order to improve the high frequency characteristics of capacitors, scholars at home and abroad have done a lot of research on the elimination of capacitor parasitic inductance, especially the elimination of capacitor...

AI Technical Summary

Problems solved by technology

Figure 3B It is a cross-sectional view along the M-N line, the upper and lower coils 301 and 302 are distributed oppositely, and the distributed capacitance C between them is 31 Larger, so it will bring about secondary parasitic effects and affect the elimination effect

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