Research And Implementation Of Signal Generation And Processing Methods Based On Electrochemical Workstations

Electrochemical workstations are important instruments for electrochemical testing.With the increasing improvement of electrochemical testing theories and the rapid development of electronic information technology,the performance of electrochemical workstations has been increasingly improved.In the scenario of the growing new energy market and increasing demand for high performance batteries,due to the important role of electrochemical workstations in battery R&D and testing,there is an increasing demand from R&D personnel for high performance electrochemical workstations with high measurement accuracy,fast response and diverse measurement methods.Although domestic electrochemical workstations have achieved good results after years of development since the 1990 s,there are still some gaps in domestic products,especially in high-end electrochemical workstations,as foreign research in this area started earlier and the theory is more perfect and preempted the market.Electrochemical workstations can play a major role not only in the field of new energy,but also in the fields of metal corrosion resistance,new materials technology,marine technology,space technology and biotechnology.The development of a high-performance electrochemical workstation is therefore of great importance.The core of an electrochemical workstation is the generation and acquisition of signals.A high-performance electrochemical workstation must meet the needs of a wide range of test methods and be able to output and acquire excitation signals for different test methods with high accuracy.In view of this question,this paper has carried on the following research:1.By introducing an auxiliary accumulator accurate control of the DDS output waveform frequency is achieved and the accuracy of the waveform frequency calculation is further improved by periodic calibration,which solves the possible problem of poor overlap of the waveform round-trip scan and improves the accuracy of electrochemical testing.2.Some DC test methods have too many critical points and too long a duration for a single point,thus taking up too much storage resources.This paper analyses the characteristics of DC test waveforms and designs a generic waveform generator for DC test methods in electrochemical testing,solving the problem of excessive storage resource usage that affects output performance.In turn,the range of achievable electrochemical test methods is increased and test performance is improved.3.This paper proposes a solution to the problem that the acquired signal is not smooth enough due to noise interference in the electrochemical workstation,by applying N-LMS adaptive filtering algorithm for noise cancellation and combining SG smoothing filtering to reprocess the waveform,so that the acquired signal can be smooth enough while preserving the waveform characteristics to achieve better test results with lower algorithm complexity and implementation difficulty.In this paper,the proposed design and solution are simulated,analyzed and tested.The results show that both the precise frequency control scheme and the generic waveform generator used in the signal generation part can meet the design requirements and enrich the diversity of testing methods for electrochemical workstations.It is also demonstrated that the combination of N-LMS adaptive filtering algorithm and SG smoothing filtering can achieve better de-noise results and is feasible for implementation.