Filter method and filter circuit applied to eps power supply system

A power supply system and filter circuit technology, which is applied in the direction of electrical components, impedance networks, digital technology networks, etc., can solve problems such as temperature drift noise, susceptibility to interference, and many system components, and achieve low-frequency interference and eliminate low-frequency interference.

Active Publication Date: 2017-08-25
深圳市宝安任达电器实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this type of filter, there are many system components and complex circuits, and there will be problems such as voltage drift, temperature drift and noise, which are susceptible to interference and poor system stability.
At the same time, it is difficult for general filters to eliminate the 3rd, 5th and other low-order harmonics with large components in the EPS power system

Method used

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  • Filter method and filter circuit applied to eps power supply system
  • Filter method and filter circuit applied to eps power supply system
  • Filter method and filter circuit applied to eps power supply system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] In the above, in step B of the debugging process and filtering process, high frequency components higher than 500HZ-1000HZ in the detection signal are filtered out; in step C, A / D sampling is performed on the detection signal at a frequency that is at least twice the highest frequency of the detection signal .

[0065] Since the filtering of the EPS power system is mainly the low-frequency part of the signal, in order to maximize the frequency band of the required detection signal and reduce the amount of data calculation for subsequent digital filtering. After a lot of experiments, it is found that the effect of pre-filtering the high-frequency components of 500HZ-1000HZ of the detection signal is the best. The subsequent detection signal sampling is obtained according to the Shannon sampling theorem.

Embodiment 2

[0067] In the above, step F of the debugging process specifically includes,

[0068] F1) Put the detection signal after A / D sampling into the data buffer area;

[0069] F2) obtain the transfer function of the Ellipt low-pass filter algorithm satisfying filter index by approximation method;

[0070] Step D of the filtering process specifically includes,

[0071] D1) storing the detection signal after A / D sampling in the data buffer area;

[0072] D2) Apply the transfer function of the Ellipt low-pass filter algorithm obtained in the debugging process to digitally filter the detection signal.

[0073] This embodiment provides a method suitable for obtaining and executing the transfer function of a specific Ellipt low-pass filter algorithm. Traditionally, the transfer function of the elliptic filter is a relatively complex function. If the traditional design method is used to synthesize the circuit network, cumbersome calculations must be performed, and table lookups must be p...

Embodiment 3

[0075] In the above, steps D-F of the debugging process are implemented by a computer; step D of the filtering process is implemented by a DSP processor. The approximation of the transfer function of the Ellipt low-pass filter algorithm can be realized by an external computer due to the large amount of processing. For example, MATLAB running on a computer can design an elliptic filter, which can greatly simplify the design process.

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Abstract

The present invention provides a filtering method and a filtering circuit applied to EPS power supply systems. The Ellipt low-pass filter algorithm is selected as the digital filter, and the filtering index is further determined according to the characteristics of the EPS power supply system combined with a large number of experiments. The system detection signal is debugged in advance to obtain the transfer function of the suitable Ellipt low-pass filter algorithm that meets the filter index, and then apply the transfer function to the specific EPS power system filter, which can better preserve the effective signal while retaining the effective signal. The elimination of low frequency interference.

Description

technical field [0001] The invention relates to power system technology, in particular to a filter method and a filter circuit applied to an EPS power system. Background technique [0002] Most existing EPS power system detection signals use analog filters. The analog filter output is converted by digital signal processing chip AD, and the AD conversion result is used as the system control input. Using this type of filter, the system has many components and complex circuits, and there will be problems such as voltage drift, temperature drift, and noise, which are susceptible to interference and poor system stability. At the same time, it is difficult for general filters to eliminate the 3rd and 5th low-order harmonics with large components in the EPS power system. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a filtering method and a filtering circuit applied to an EPS power supply system with good filtering ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
Inventor 田清和嵇世卿
Owner 深圳市宝安任达电器实业有限公司
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