According to the problem of low feature differentiation and noise interference of soft fault signal in circuit

it proposes a denoising method based on the joint DBO(dung beetle optimizer) and VMD.The method uses DBO algorithm to find the optimal VMD parameters

uses the optimized VMD to decompose the noisy voltage signal and reconstruct the IMF.The 13-dimensional time domain parameters of the reconstructed signal are extracted as the feature vector of the original response signal

and this feature vector is applied to build a SVM(support vector machine) fault diagnosis model.Finally

the effectiveness of this method is verified by two diagnostic examples of active filter circuit.This method can effectively remove the noise in the voltage signal and the denoising effect is better than the single common denoising methods such as EMD(empirical mode decomposition) and EEMD(ensemble empirical mode decomposition).