Active filter

Abstract

The invention discloses an active filter, which comprises a shell, a wire inlet hole, a wire protection sleeve, a support beam, a terminal strip, an installation plate, a controller, an air switch, apartition plate, a sensor, a through hole, a shock pad, a filter main body, a heat dissipation port, support legs, a front panel, an observation window, a screw rod, a rear panel, a sealing pad and aflow guide plate. The beneficial effects of the invention are that: the method is suitable for large-scale production; the inner ring of the wire inlet hole is provided with a circle of wire protection sleeve made of a soft material; the connecting wire going in and out of the shell can be effectively prevented from being abraded; the terminal strip is located right below the wire inlet hole; therefore, the wiring of the active filter is convenient in use. A plurality of through holes which are communicated up and down are evenly formed in the partition plate, so that the upper air and the lower air can be exchanged freely. It is guaranteed that heat dissipation is uniform, a layer of deformable shock pad is arranged between the filtering body and the outer shell. When the filtering body works, the impact of the filtering body on the outer shell is reduced. Therefore, the noise is effectively prevented from being generated.

Description

technical field [0001] The invention relates to a filter, in particular to an active filter, and belongs to the field of power supply equipment. Background technique [0002] Active filter is a new type of power electronic device used to dynamically suppress harmonics and compensate reactive power. It can quickly track and compensate harmonics of different sizes and frequencies. The reason why it is called active is relative to passive As far as filters can only passively absorb harmonics of fixed frequency and size, active filters can control and actively output the size, frequency and phase of current by sampling the load current and separating each harmonic and reactive power, and Quick response, offset the corresponding current in the load, realize dynamic tracking compensation, and can not only compensate harmonics but also compensate reactive power and unbalance. The active power filter is relative to the passive power filter. Of course, its use effect It is better th...

AI Technical Summary

Problems solved by technology

The active power filter in the prior art has a poor heat dissipation effect, so overheating often causes failures, and the existing active power filter generates more noise during operation, and does not have the function of reducing noise. It is easy to cause noise pollution during the process

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