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Adaptive filter

An adaptive filter and filter technology, applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as ineffective filtering of high-frequency harmonics in power lines, electrical system interference, etc. , to achieve the effect of high cost and large space occupation

Active Publication Date: 2015-04-22
AMERICAN ENVIRONMENT ELECTRIC POWER CO
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Problems solved by technology

[0008] The purpose of the present invention is to solve the interference of modern microelectronic components to the electrical system, and the existing power filter can only filter out the noise above 400kHz, and cannot effectively filter out the technical problem of high-frequency harmonics in the power line , design an adaptive filter that dissipates and shunts higher frequencies to capacitors to effectively filter out high and low frequency noise interference in power lines

Method used

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with accompanying drawing. The structure and principle of this device are very clear and easy to understand for those skilled in the art. The specific embodiments described here are only in order to explain the present invention, and are not intended to limit the present invention.

[0034] The invention is to use the power frequency supply voltage as a reference, the higher frequency noise is dissipated and shunted to the capacitor, and then dissipated to the ground, as figure 1 shown. Vs, RS, and LS are the power supply voltage, source resistance, and source inductance of the power line, respectively. The low voltages commonly used in power distribution systems of many industrial plants are 110V, 220V, 380V, 480V, and 760V, which can be single phase or three phase.

[0035] This example describes the application in a single phase system. It can be easily extended for use in delta or star configurat...

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Abstract

The invention provides an adaptive filter which effectively eliminates noise and peaks with 2kHz-1MHz frequency in an industrial power distribution system. According to the adaptive filter, harmonic power frequency voltage is independently used as reference voltage, and a harmonic component is traced along the reference voltage. Noise consists of a series of random peaks and has no alternating current and direct current difference, so that the noise can be filtered in the traditional RC (Resistance-Capacitance) or RCL (Resistance-Capacitance-Inductance) circuit and an active filtering network. Voltage reduction can ensure that a used large-value capacitor can effectively extend a filtering frequency range to 2kH2. The method is high in cost and large in space occupation.

Description

[technical field] [0001] The invention relates to the technical field of circuits, in particular to an adaptive filter. [Background technique] [0002] With dramatic improvements in automated processing and productivity over the past 25 years, we have witnessed advances in microelectronics and a trend toward increased power efficiency. However, the power industry faces daunting challenges in maintaining the quality of power supply. Power disruptions from new technologies lead to extended downtime, data loss, equipment damage, inefficient power supplies, and lost productivity. Therefore, it is critical to completely eliminate distractions and increase customer productivity. [0003] In the past, electrical interference mainly came from lightning strikes, grounding and electrical equipment. Circuit breakers and grounding keep the grid and equipment functioning properly. Currently, 85% of electrical pollution comes from switching power supplies used in microelectronics, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 李成敏
Owner AMERICAN ENVIRONMENT ELECTRIC POWER CO
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