Active power filter input voltage range rated voltage of 380V, can withstand -40% to + 20% voltage fluctuation, frequency of 50 / 60Hz, can withstand +/- 5% of the frequency fluctuations, to adapt to different conditions power quality environment. Meanwhile, if the voltage fluctuation exceeds the upper limit, the machine automatically latching output, and an alarm. Automatic current limiting automatic limited within the range of the rated output capacity of 100%, if the load side harmonic currents greater than the rated capacity of the machine, the machine will continue to output harmonic current compensation within the rated capacity, it will not lead to overload itself overloaded or out of service. Load short-circuit protection can withstand the impact of short-circuit load instantly, eliminate restarted after a short circuit. Design Method of Active Power Filter active filter design methods, generally can be attributed to two categories cascade method and simulation. Cascade method according to the technical requirements of sail harmonic control, find the transfer function may be physically implemented (often be readily active filter materials and manuals Richard), and breaking it down into low-level functions (mainly second-order function) of the product, these low-level functions are identified by active circuitry then cascaded to achieve the original transfer function. Low order function circuit known as the basic section, there are many typical second-order basic circuit section for designers to use. The number to use at basic amplifier section can be divided into single amplifier circuit, bi-amp circuit, an amplifier circuit three or four amplifier circuits. Cascade method design process is relatively simple harmonic control, easy to adjust circuit characteristics mine harmonic control circuit compares the intermediate frequency harmonics to achieve economic governance, is commonly used method. Simulation can be designed to meet the technical requirements of the LC filter as a prototype, and then to simulate an active circuit to achieve. This method can be divided into two functional element simulation and simulation, and more with double-end terminating resistor LC ladder filter prototype. Typically, the analog method required more elements than the cascade method. IF 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!