Looking to improve active filter active filter, on the one hand depends on the progress of components and integration technology, but it is also dependent on the circuit configuration and design innovation. Although RC active filter integrated energy mix, but fully integrated high quality RC active filter still unsolved. The main difficulty is not directly integrated precision resistive and capacitive elements Harmonic manufacturers in the chip, and a large share of the chip resistor and large capacitor area is too large. Switched capacitor filter to solve this problem opened the way to achieve a fully integrated; but it belongs to a discrete-time analog filters, and there is work to be improved and low frequency bands. An integrated filter to achieve precise resistance program is the use of linear MOS transistor (ie, unsaturated) zone to act as analog resistive characteristic, which is a voltage controlled by a gate voltage controlled resistance, it can be used off-chip (ie The chip away) reference value harmonic control, such as a crystal clock or an external RC components, with on-chip control circuit to precisely adjust the time constant of the circuit. This is a promising solution. There is also a composition with a transconductance operational amplifier (OTA) and capacitance C of the active filter, also promising a fully integrated solution. BDKJ-LC-II-type power filter compensation device BDKJ-LC-II-type filter compensation device uses 80C196 single chip microcomputer as the core dynamic filter compensation controller, contactor main circuit using high-performance switching filter compensation branch of harmonic control Case management, based on the user's system, reactive power, power factor and harmonic overall judgment automatic switching. Filter branch by a professional design and manufacture of filter reactor, filter capacitor, filter resistance device composed situ filter compensation, harmonic suppression of a specific frequency, reactive power compensation, improve power factor. High equipment reliability, low maintenance, durable. Harmonic automatically deactivated when external technical failure or power outage, automatic recovery after power to operate without human intervention. Applications BDKJ-LC-II-type power filter compensation device is mainly applied to the electrical environment containing harmonics, steady overall user load changes, is necessary to suppress harmonic reactive power compensation, improve power factor of the user. For example: a metal smelter, rolling mill (cold), the plastic products factory, Metal Products, electroplating plants, pipe mills, chemical plants, saw mill, heat treatment plants, cement plants, paper mills, water plant, salt chemical plant ceramic factory, strip processing plants. Harmonic control method, learning Connaught Electrical and Mechanical (certified), harmonic control by learning Connaught Mechanical and Electrical Equipment Co., Ltd., Henan. Henan Xi Connaught Electrical Equipment Co. (www.hnxinuo.com) is Zhengzhou, electronics, electrical products processing leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In practice Connaught Electrical and Mechanical leadership with the staff warmly welcome all inquiries negotiations to create learning Connaught Electrical and Mechanical better future.