When designing an active filter cabinet, the following design steps are generally followed.
1. Design scheme for communication
Based on the needs of filter characteristics, design a certain type of farth-order transfer function, and then dissolve the n-order transfer function into multiple low-level transfer functions to multiply.
When designing low-pass, high-pass chips, bandpass, and bandstop active filter cabinets, the normalization of operating frequency is generally chosen, and the low-pass prototype transmission function of the design scheme is first designed. If the design scheme of the bandpass active filter cabinet is specified, then convert the low-pass prototype transmission into the low-pass overall target transmission; If the design scheme of the Qualcomm active filter cabinet is specified, the low-pass prototype transmission function will be converted into the overall target transmission function of the Qualcomm chip; If the design scheme of the active filter cabinet is specified, then convert the low-pass prototype transmission function into the bandpass overall target transmission function; If the design scheme of the bandstop active filter cabinet is specified, the low-pass prototype transmission function will be converted into the bandstop overall target transmission function.
2. Circuit principle
According to the design points of each low-level transmission, the basic sections of the design plan and calculation of the power circuit of the active filter cabinet are presented. Firstly, select the power circuit mode, and then design and calculate the corresponding component variable values based on the formulated transmission letter. Based on the design points, clearly propose the actual needs for each circuit component.
3. Installation and adjustment of power circuit
Firstly, design and install each low-level active filter cabinet circuit, and then cascade each low-level power circuit to form the entire active filter cabinet circuit. Conduct corresponding adjustment and functional testing on all active filter cabinet circuits, and check the design scheme conclusion.
Application of Active Filter Cabinet in Public Places
1. Machinery manufacturing industry
The welding machine is an indispensable machine equipment in the machinery manufacturing industry. Because the welding machine has the characteristics of contingency, high frequency and destructiveness, many applications of the welding machine lead to serious problems in power quality analysis, which leads to unstable welding quality and strong automation of intelligent robots unable to work due to short circuit, and the reactive power compensation system software cannot be started normally.
2. Series resonance test of DC brushless motor
In large and medium-sized DC brushless motor sites, it is necessary to first convert the AC power supply into AC power based on the rectifier machine equipment. Due to the large load capacity of these engineering projects, there is relatively serious harmonic current environmental pollution on the communication AC side, resulting in working voltage fluctuations, which can cause safety accidents in severe cases.
3. Application of automated assembly lines and precision equipment
In automated assembly lines and precision equipment locations, harmonic currents can affect their normal startup, causing abnormalities in intelligent monitoring systems, PLC system software, etc. Therefore, it is necessary to use an active filter cabinet.