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 harmonics can be mixed integrated governance standards, but high quality fully integrated RC active filter still unsolved. The main difficulty is not directly integrated precision resistive and capacitive elements on 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, such as a crystal clock or an external RC element harmonic control technology, with on-chip control circuitry within precisely adjust the time constant of the circuit. This is a promising solution. Also active filter Harmonic a transconductance operational amplifier (OTA) and the capacitor C form is also promising a fully integrated solution. High pressure H.APF active power filter and reactive compensation devices integrated high voltage H.APF active power filter and reactive compensation devices without the use of an integrated capacitor, a reactor to generate reactive power, instead of using power electronic devices IGBT power modules build a three-phase rectifier and inverter circuits, consisting of dynamic filtering and reactive power of a power (Active Power Filter), which is a set of filtering, reactive power compensation in one, can load generating real-time tracking of multiple harmonic filtering, but also load generated reactive compensation and continuous two-way adjustment, to achieve high-voltage power factor approaching full H.APF active power filter and reactive compensation devices integrated to overcome the many disadvantages SVC passive harmonic control products manufacturers, is H. technology upgrades SVG active products. High voltage electricity H.APF ++ integrated active filter and reactive compensation devices capable security under any operating conditions of continuous work, which also brings simplicity to the design and management, it is SVC replacement products, H.APF creating a face Power Quality control twenty-first century a new era, will become in the future in the field of reactive power compensation and harmonic governance mainstream. Harmonic control, harmonic control, provided by the Henan Xi Xi Connaught Electrical and Mechanical and Electrical Equipment Co. Connaught. Henan Xi Connaught Electrical Equipment Co. (www.hnxinuo.com) strong, credible, in Zhengzhou, Henan electronics, electrical products processing industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Connaught Electrical and Mechanical study into the brilliant and you work for a better future!