A Design Method of Output Controller of Fiber Optic Current Transformer Based on Multi-stage Comb Filter
A technology of comb filter and output controller, which is applied in the direction of only measuring current, voltage/current isolation, measuring current/voltage, etc., can solve the problems of difficult conversion of sampling rate, high order of FIR filter, etc., to increase data The effect of transmission distance, reduction of requirements, reduction of computation and data storage
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Embodiment 1
[0038] A design method of an output controller of an optical fiber current transformer based on multistage comb filtering, the design method specifically includes the following steps:
[0039] Step 1: Determine the number of stages and downsampling rate of the multi-stage comb filter according to the simulation of the closed-loop system structural parameters of the optical fiber current transformer; Figure 5 The schematic diagram of the closed-loop system structure of the optical fiber current transformer shown;
[0040] Step 2: Design the FPGA module according to the multistage comb filter determined in step 1;
[0041] Step 3: Determine the output controller according to the FPGA module in step 2.
[0042] Further, the multi-stage comb filter in step 1 is a cascade of multiple single-stage comb filters.
[0043] Further, the single-stage comb filter is a single-stage CIC filter,
[0044] The discrete domain function of the CIC filter is:
[0045] h(n)=ε(n)-ε(n-M);
[0...
Embodiment 2
[0067] According to the simulation of the structure parameters of the closed-loop system of the optical fiber current transformer, the number of stages and the downsampling rate of the multi-stage comb filter are determined, and the structure of the single-stage comb filter is as follows: figure 1 shown. Depend on figure 1 It can be seen that the discrete transfer function of the single-stage CIC filter is:
[0068]
[0069] let z=e jω , its amplitude-frequency response can be obtained as:
[0070]
[0071] In the formula, is the sampling function. The spectral characteristics of the single-stage CIC filter under different downsampling orders M are obtained by simulation as follows: figure 2 shown.
[0072] It can be seen from the spectrum diagram that when the downsampling rate M of the CIC filter is much greater than 1, the amplitude attenuation of the first side lobe level is fixed at about 13.46dB, that is, the stopband attenuation cannot be increased by incr...
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