Power supply wave shape correcting filter

Abstract

This invention discloses a filter for correcting supply waveforms including a parallel non-linear resistor and a first capacitor, a first inductor and a second inductor with coils of the same turns winded on a same magnetic core reversely, a second capacitor and a third and fourth capacitors in series, in which, the two input ends of the two inductors are connected to both ends of the first capacitor, the second capacitor is bridged between the outputs of the first two inductors, the serial ends of the third and the fourth capacitors are bridged between the outputs of the first two inductors to be parallel to the second capacitor, the connecting point of the third and fourth capacitors is connected to the earth, the filter also includes a first resistor connected between the output of the first inductor and the input of the second inductor and said core is a nano-grain alloy ring one.

Description

Technical field [0001] The invention relates to a power supply filter for correcting and absorbing power grid pollution, in particular to a power supply waveform correction filter for correcting and absorbing destructive high-order harmonics, surges (surges), spike signals and other clutter in the power grid . Background technique [0002] With the extensive use of various advanced instruments and equipment, it will cause various pollution and interference, especially the pollution of the power grid. Certain equipment usually produces grid pollution, and some equipment is often affected by grid pollution. [0003] Such as figure 1 with 2 As shown, figure 1 Are normal grid harmonics, figure 2 It is the polluted grid harmonics. [0004] Grid pollution mainly refers to high-order harmonics, instantaneous currents, surges, high-frequency noise, etc. These components directly cause harm to user equipment. The ratio of the harmfulness of high-order harmonics to the equipment and the...

AI Technical Summary

Problems solved by technology

[0010] Although the above-mentioned power line filter has a good filtering effect on the differential mode and common mode noise in the higher frequency band, it only uses a nonlinear resistor to suppress the surge and spike interference, and the suppression ability is not good. The differential mode interference filtering effect is poor, and the ferrite core has a low permeability, so the obtained inductance is small. If you want to increase the inductance, you need to increase the volume of the core, occupying space, and the inductance core is easy to saturate. As the core is saturated, its suppression performance decreases. In addition, the loss of the ferrite core is large, and the heat generation is also increased, which reduces the saturation magnetic flux density and damages its suppression performance.

Therefore, it is difficult to ensure the use of this filter on instruments and equipment with high requirements on network power.

Images