臨汾不錯蓄電池

時間：2018-07-06作者：北京金業(yè)順達(dá)科技有限公司瀏覽：39

臨汾不錯蓄電池


成功檢測不錯蓄電池狀態(tài)的前提是可以提供需要的交流恒流源。恒流源是能夠向負(fù)載提供恒定電流的電源裝置。它是一個電源內(nèi)阻非常大的電源。為了保證內(nèi)阻有較高的測量精度及較好的重現(xiàn)性，要求恒流電流源有足夠的穩(wěn)定度，并且波形失真度要小。這里所需交流信號幅度為40mV，頻率為1KHZ

The premise of successful detection of battery state is that it can provide the needed AC constant current source. The constant current source is a power supply that can provide a constant current to the load. It is a power supply with a very large internal resistance. To ensure that the internal resistance has high measurement accuracy and good reproducibility, constant current source is required to have enough stability and waveform distortion is small. The magnitude of the AC ** required here is 40mV and the frequency is 1KHZ.
但是傳統(tǒng)的低頻交流信號發(fā)生器設(shè)計中存在很多的不足：應(yīng)用通用電路,元器件多,尤其是電容的體積大,且波形的穩(wěn)定性差、失真大,調(diào)節(jié)也較不方便；應(yīng)用**電路,如ICL8038、MAX038等,其失真和穩(wěn)定性方面有明顯提高,但低頻應(yīng)用時不合適,調(diào)節(jié)不方便,成本也較高。
But there are many shortcomings in the traditional low frequency AC ** generator design: the application of general circuit, many components, especially the volume of the capacitance, and the poor stability and distortion of the waveform, and very inconvenient to adjust. The application of special circuit, such as ICL8038, MAX038 and so on, has obviously improved the distortion and stability, but it is used in low frequency. It is not suitable, the adjustment is inconvenient, the cost is also high.




3．1 設(shè)計原理
3.1 design principle




本文采用了數(shù)字式信號發(fā)生器產(chǎn)生標(biāo)準(zhǔn)正弦波和電流負(fù)反饋法產(chǎn)生精確交流恒流源法, 交流恒流源實(shí)現(xiàn)原理如圖2所示。
In this paper, a digital ** generator is used to produce a standard sine wave and a current negative feedback method to produce an accurate AC constant current source method, and the principle of AC constant current source realization is shown in Figure 2.












精確測量蓄電池內(nèi)阻方法的研究
Study on the method of accurately measuring the internal resistance of the battery








電路組成框圖如圖2所示：這是一個閉環(huán)控制系統(tǒng)，電流負(fù)反饋電路。標(biāo)準(zhǔn)正弦波產(chǎn)生一個頻率穩(wěn)定、對稱、失真度低的1KHz正弦波信號。驅(qū)動電路把正弦波放大，去推動功放電路，得到正弦交流電流輸出。恒流控制電路從功放輸出中得到的信號，通過與給定的信號相比較，來調(diào)節(jié)驅(qū)動電路的信號，從而使輸出電流保持穩(wěn)定。
The block diagram of the circuit is shown in Figure 2: This is a closed loop control system and a current negative feedback circuit. The standard sine wave produces a 1KHz sine wave with stable frequency, symmetry and low distortion. The driving circuit amplifies the sine wave to drive the power amplifier circuit, and obtains the sinusoidal AC current output. The ** obtained from the output of the power amplifier by the constant current control circuit, by comparing with the given **, adjusts the ** of the driving circuit, so that the output current is kept stable.




3．2 標(biāo)準(zhǔn)正弦波的產(chǎn)生原理
The principle of the generation of 3.2 standard sine wave




標(biāo)準(zhǔn)正弦波信號的產(chǎn)生采用數(shù)字式信號發(fā)生器。首先將正弦表數(shù)據(jù)存儲在如圖3所示的正弦信號存儲器中,晶振產(chǎn)生振蕩頻率f，經(jīng)過整型電路變?yōu)橥暾讲l率，再經(jīng)過R分頻電路得到頻率為f/R,再經(jīng)過鑒相器FD和環(huán)路濾波器LF電路鎖相分頻后，讀取存儲在正弦信號存儲器中的正弦值,經(jīng)過D/A轉(zhuǎn)換電路和經(jīng)低通有源濾器濾波電路，生成圖2 所需的標(biāo)準(zhǔn)正弦波。
The standard sine wave ** is generated by digital ** generator. First, the sinusoidal data is stored in the sinusoidal ** memory as shown in Figure 3. The oscillator produces an oscillating frequency f, after the integral circuit is transformed into a complete square wave frequency, and then the frequency is f/R through the R frequency division circuit, and then after the phase discriminator FD and the loop filter LF circuit are locked in phase, the reading stored in the sinusoidal ** memory is read. String value, through D/A conversion circuit and low-pass active filter filter circuit, generate standard sine wave required for Figure 2.


由于電池內(nèi)阻為毫歐級，因此采用常規(guī)的兩端子測量方法測量誤差較大，在此采用四端子測量方式。測量時兩個端子施加一頻率為
Because the internal resistance of the battery is millieu level, the conventional two terminal measurement method has great error, and the four terminal measurement method is adopted. At the time of measurement, two terminals are applied in a frequency








精確測量蓄電池內(nèi)阻方法的研究
Study on the method of accurately measuring the internal resistance of the battery




的恒定交流激勵電流信號，另兩個端子用于測量。測量工作原理圖如圖1所示，響應(yīng)信號是指蓄電池注入交流恒流源后，在其兩端測出的交流電壓信號。而正弦信號是經(jīng)D/A產(chǎn)生的作為壓控恒流源的輸入信號。
A constant AC excitation current ** and the other two terminals are used for measurement. The working principle diagram is shown in Figure 1. The response ** is the AC voltage ** measured at both ends after the battery is injected into the AC constant current source. Sinusoidal ** is generated by D/A as the input ** of voltage controlled constant current source.
























設(shè)正弦信號為：
The sine ** is set as:








精確測量蓄電池內(nèi)阻方法的研究
Study on the method of accurately measuring the internal resistance of the battery












（1）
(1)
蓄電池兩端的響應(yīng)電壓信號為：
The response voltage **s at both ends of the battery are:








（2）
(2)








精確測量蓄電池內(nèi)阻方法的研究
Study on the method of accurately measuring the internal resistance of the battery
為注入蓄電池的交流電流和其兩端響應(yīng)電壓信號的相位差。
The phase difference between the AC current and the voltage **s at both ends of the battery is injected.
通過模擬乘法器后有：
After the analog multiplier, there are:








精確測量蓄電池內(nèi)阻方法的研究
Study on the method of accurately measuring the internal resistance of the battery




K為模擬乘法器的放大系數(shù)。
K is the magnification factor of the analog multiplier.
進(jìn)行低通濾波后濾掉交流成分得：
After low pass filtering, filter off the AC component:












精確測量蓄電池內(nèi)阻方法的研究
Study on the method of accurately measuring the internal resistance of the battery




（3）
(3)




由交流法測內(nèi)阻原理得：
The principle of measuring internal resistance by AC method is obtained.








精確測量蓄電池內(nèi)阻方法的研究
Study on the method of accurately measuring the internal resistance of the battery




（5）
(5)
式中I為交流恒流源信號的較大值。比較（4）、（5）可得：
I is the maximum value of the AC constant current source **. Comparison (4) and (5) can be obtained:












精確測量蓄電池內(nèi)阻方法的研究
Study on the method of accurately measuring the internal resistance of the battery








上式中K、A、I都是已知量，而u為經(jīng)過A/D采樣送到單片機(jī)進(jìn)行處理的采樣值，所以在單片機(jī)中進(jìn)行一個簡單的除法運(yùn)算便能得到蓄電池內(nèi)阻了。


The K, A and I in the upper form are all known, while u is sampled by the A/D sample to the single chip processor, so a simple division operation in the single chip can get the internal resistance of the battery.




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