1311828 九、發明說明： 【發明所屬之技術領域】 作頻池偵測技術’尤其是-種電池最隹工 到最_ί;抑ί J;:使習知之電幽充電法達 【先前枝術】 出，許多電池之充電策略相繼被提 j i /二充电（C〇nstant trickle current charge)、定雪 ί)。電流充電（或稱定電壓限電流，兩階段充 ϊ,ί之電流來對電池充電，但其缺點在 此問題，巨前最廣泛使用的定電壓定電流充ί策 Ϊ定止工用，電f對電池充電充電-直到ί 桩荽右^电終止電壓（fmai voltage)，到此設定電壓後， 奋雷雷Ϊ器以等值於設定電壓值的定電壓對電池充電，且 ιϋϊΐ自動地Ϊ少。當充電電流減少至零時，視為電池 池彦定電流充電策略原本可有效地預防電 曰it過充電〇vercharge)，但也因而拖長充電時間，而 ί傳f之定電壓定電流充電策略所採用為一開路控制ΐ 2、羅if定性並不足。為有效解決上述之問題，一輔有ί莫 f建輯控制器之充電系統（Fuzzy-C〇ntr〇lled Battery Char杜 /stem，FCBCS)於疋被提出，其可推論出—合適之充電 >m·值以改善充電性能。而後類神經網路與基因演算法亦 用在模糊控制式充電系統中供協調及最佳化變^了以狗 更適合的充電電流。然而，如何設計一種確保電池充電^ 於安全情況下的充電系統卻尚未被發表。我國發明發^ 451512提出了一輔以主動充電狀態偵測法之模糊控& ^電系統，的確可減少充電時間並保證電池之充電是處1 安全充電範圍（Safe-Charge Area, SCA)。上述的電池充電策 略並沒有考慮到電池的電化學反應，所以對電池的使用壽 5 -1311828 256408 ^ 271470 ^ 478681 衝ίίί;是-種有考慮到電化學反應中i 的電平電法的是利用休息時間使不同濃度 效減輕電極老化現象，進盖有 定最佳脈衝充電頻率，舞命。但如何決 之一。 、疋目則脈衝充電法所極欲解決問題 【發明内容】 I.所欲解決之問題： 浐衝充電法是一種有考慮到電化學反岸中錐早沾挪 矛夕問喊。脈衝充電法是利用休自:ϋ離子的祙 極老化現ί進而軸 衝充電頻率，是目前脈榭可叩。但如何決定最佳脈 2.解決問題1技;手目：:脈衝充電法所極欲解決之問題。 本發明揭示一以量測電池雷壓盥+治4α & 最ϊί作頻率之方法與裝= 大，不僅能縮短充電時間亦能辦=電&就越 ，，本發明就是依據此原理，提4 ^ 2螌於電流相 之方法與裝置。 捉出電池的攻佳工作頻率 一種電池最佳工作頻率之I、、則古、上# h 3 : a·以交流電對電池充電；b量測tf驟至少包 差，並判斷該相位差是否為.里電池電壓與電流相位 變交流電頻率，並回到步‘二d相位差不為零，則改 即為電池最佳工作頻^ ;里中今參差為零，則該頻率 弦波、三，波、鑛齒波中奚一奴電可為脈波、方波、 含:a.以交流g圭電池作充^率法，其步驟至少包 f相位差是否為零；e.若相相位差，並判斷 率，並回到步驟a;f.若相位差為：為交流電頻 令貝丨該頻率即為電池最 6 !311828 佳工作頻率；其中該交流電 波、鋸齒波中任一種。电J為脈波、方波、弦波、三角 一種電池最佳工作頻率 | 壓充電產生器、相位差_Μ 衣置，其至少由交流電 電壓充電產生器，係；其中，交流 壓來對電池充電；相位差鑑$含之河，用以提供一交流電 測電池電壓與電流的相位i.I二糸t電池連接，用以量 器的輸，，用以接收相位以流電壓充電產生 據此控制改變交流電壓充電產ζ哭二的相位差，並 頻率；其中該交流電壓充電產用者該最佳工作 脈波、方波、弦波、三角波生的交流電壓可為 序為：首先，交流電壓充電產種。其工作程 池充電；同時，相位差鑑別器二交流電壓對電 流相位，並將相位差送回給护亡的電壓相位與電 則改變θ交流電壓充電產生器g輸z顏:有相位差，控制器 電，並重測電池的電壓與電流#胃t ’亚再次對電池充 直到電池的電壓與電流相位差^重複上述步驟， 電流相位差為零的頻率即為電；二二使電池的電壓與 會將該最佳工作頻率送至作頻率；控制器 工作頻率。 σ 乂^知使用者該最佳 一種電池最佳工作頻率之旦 流充電,生器、相位差鑑別器里/電‘妖其至少由交流電 令’交流j流充電產生器，係jjjj制器所組成；^ 一交來對電池充電；相、^哭也之前，用以提 ί池電壓與電流的相mi’係和電池連接： ίίίίί=ί;;;其中該;ίί2以 ί 交 齒波中任-種rigj:'、方波、弦波Hi產生 流電流充電產生器；產；頻序為控|;，， ‘對電池充電百ί時- 7 .1311828 ' 相位差鑑別器會量測電池的電壓相位與電流相位，用以得 出相位差，並送回給控制器；若有相位差，控制器則改變 交流電流充電產生器的輸出頻率，並再次對電池充電，並 量測電池的電壓與電流相位差；如此重複上述步驟，直到 電池的電壓與電流相位差為零；而該使電池的電壓與電流 相位差為零的頻率即為電池的最佳工作頻率；最後控制器 會將該最佳工作頻率送至顯示器，用以告知使用者該最佳 工作頻率。 一種電池最佳工作頻率之量測裝置，其至少是由電壓 放大器、鎖相迴路和電池所組成；其中，電壓放大器，係 接於鎖相迴路的輸出端，電池的輸入端，用以放大鎖相迴 # 路的輸出訊號，進而對電池充電；鎖相迴路，係接於電壓 放大器的輸入端，電池的輸出端，用以量測電池的電壓與 電流相位差，並據此改變輸出訊號的頻率。其中，該鎖相 迴路是由相位比較器、低通濾波器和電壓控制振盪器所組 -成。其亦可包含一顯示器，連接於鎖相迴路，用以告知使 用者該最佳工作頻率。其工作程序為：一開始，電壓控制 '振盪器會振盪出一交流訊號，該訊號經電壓放大器放大後 送至電池對其進行充電；同時，相位比較器會量測電池的 電壓與電流相位差，該相位差會經由低通濾波器整成一直 流訊號，並用以改變電壓控制振盪器輸出的頻率；如此重 複上述步驟，直到電池的電壓與電流相位差為零，而該使 • 電池的電壓與電流相位差為零的頻率即為電池的最佳工作 頻率。 一種電池最佳工作頻率之量測裝置，其至少是由電流 放大ι§、鎖相迴路和電池所組成，其中’電流放大益’係 接於鎖相迴路的輸出端，電池的輸入端，用以放大鎖相迴 路的輸出訊號，進而對電池充電；鎖相迴路，係接於電流 放大器的輸入端，電池的輸出端，用以量測電池的電壓與 電流相位差，並據此改變輸出訊號的頻率。其中，該鎖相 迴路是由相位比較器、低通濾波器和電壓控制振盪器所組 成。其亦可包含一顯示器，連接於鎖相迴路，用以告知使 用者該最佳工作頻率。其工作程序為：一開始，電壓控制 振盪器會振盪出一交流訊號，該訊號經電流放大器放大後 8 13 π 8281311828 IX. Description of the invention: [Technical field of invention] Frequency pool detection technology 'especially - the most complete type of battery to the most _ ί; ί J;: make the conventional electric singular charge method [previous branch 】 Out, many battery charging strategies have been ji / two charge (C〇nstant trickle current charge), fixed snow ί). Current charging (or rated voltage limit current, two-stage charging, ί current to charge the battery, but its shortcomings in this problem, the most widely used constant voltage constant current is sufficient to stop the work, electricity f Charge the battery to charge - until the mai pile 荽 right ^ electric end voltage (fmai voltage), after setting the voltage, the ray thunder Ϊ 以 以 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等 等Less. When the charging current is reduced to zero, it is considered that the battery cell's current charging strategy can effectively prevent the electric 曰it overcharge 〇vercharge), but it also prolongs the charging time, and the voltage constant current of ί transmission f The charging strategy is adopted as an open circuit control. In order to effectively solve the above problems, a charging system (Fuzzy-C〇ntr〇lled Battery Char/stem, FCBCS), which is supplemented with a controller, was proposed, which can be inferred—suitable charging> m value to improve charging performance. Later, neural networks and gene algorithms are also used in fuzzy-controlled charging systems for coordination and optimization to optimize the charging current for dogs. However, how to design a charging system that ensures battery charging in a safe situation has not yet been published. China's invention 451 512 proposed a fuzzy control & ^ electric system with active charging state detection method, which can reduce the charging time and ensure that the battery charging is in the Safe-Charge Area (SCA). The above battery charging strategy does not take into account the electrochemical reaction of the battery, so the life of the battery is 5 - 1311828 256408 ^ 271470 ^ 478681 是 ίίίί; The rest time is used to reduce the aging phenomenon of the electrode with different concentration effects, and the cover has an optimal pulse charging frequency and dance life. But how to decide one. The main reason is that the pulse charging method is extremely problem-solving. [Inventive content] I. The problem to be solved: The charging method is a kind of consideration. The pulse charging method is based on the use of Hsu: ϋ 祙 老化 老化 现 进而 进而 进而 进而 进而 进而 进而 进而 进而 进而 轴 轴 轴 轴 轴 轴 轴 轴 轴 轴But how to determine the best pulse 2. Solve the problem 1 technology; the purpose:: The problem that the pulse charging method is extremely difficult to solve. The invention discloses a method for measuring the voltage of the battery, the pressure of the battery, and the method of loading and lowering, which can not only shorten the charging time, but also can be used to control the electric power. The invention is based on this principle. A method and apparatus for extracting 4^2 from the current phase. The best working frequency of a battery is captured. I, the ancient, the upper #h 3 : a · the battery is charged by the alternating current; the b-measurement tf is at least the difference, and it is judged whether the phase difference is The battery voltage and current phase change to the AC frequency, and return to the step 'two d phase difference is not zero, then the battery is the best working frequency ^; the current and current variations are zero, then the frequency sine wave, three, In the wave or mineral tooth wave, the slave wave can be a pulse wave or a square wave, including: a. The AC g-cell battery is used as the charging rate method, and the step of at least f phase difference is zero; e. if the phase difference is And judge the rate, and return to step a; f. If the phase difference is: for the AC frequency, the frequency is the best 6!311828 operating frequency of the battery; wherein the alternating current wave, sawtooth wave. Electric J is a pulse wave, square wave, sine wave, triangle, a battery optimal operating frequency | pressure charge generator, phase difference _ 衣 clothing, which is at least charged by the AC voltage generator, where the AC voltage is applied to the battery Charging; phase difference meter $ included in the river, used to provide an AC voltage measurement of the battery voltage and current phase iI two t battery connection, used to measure the output, to receive the phase to charge the flow voltage to generate control accordingly The AC voltage is charged and the phase difference of the crying is two, and the frequency; wherein the AC voltage is charged by the best working pulse wave, square wave, sine wave, and triangular wave, and the alternating voltage can be in the order of: first, the AC voltage is charged. Seed production. The working process pool is charged; at the same time, the phase difference discriminator two AC voltage vs. current phase, and the phase difference is sent back to the guardian's voltage phase and the electric power is changed θ AC voltage charging generator g input z face: there is a phase difference, The controller is electrically, and re-measures the voltage and current of the battery. #胃 t 'Asia again charges the battery until the voltage and current phase difference of the battery. ^ Repeat the above steps, the frequency of the current phase difference is zero; the voltage of the battery The best working frequency will be sent to the frequency; the controller operating frequency. σ 知 know that the best battery of the best operating frequency of the user, the current, the phase difference discriminator / electric 'demon' at least by the AC command 'AC j-stream charge generator, is the jjjj system Composition; ^ one to charge the battery; phase, ^ cry before, to raise the voltage and current phase of the pool and the battery connection: ίί2 in ί 交Any-type rigj: ', square wave, sine wave Hi to generate current and current charge generator; production; frequency sequence is control |;,, 'charge the battery for hundreds of hours - 7.1311828' phase difference discriminator will measure the battery The voltage phase and current phase are used to derive the phase difference and sent back to the controller; if there is a phase difference, the controller changes the output frequency of the AC current charging generator, and recharges the battery, and measures the battery. The voltage and current are in phase difference; the above steps are repeated until the voltage and current phase difference of the battery is zero; and the frequency at which the voltage and current phase difference of the battery is zero is the optimal operating frequency of the battery; finally, the controller will The best working frequency is sent to the display. To inform the user that the optimum operating frequency. A measuring device for optimal operating frequency of a battery, which is at least composed of a voltage amplifier, a phase locked loop and a battery; wherein the voltage amplifier is connected to the output end of the phase locked loop, and the input end of the battery is used to amplify the lock The phase-out signal of the #路, and then the battery is charged; the phase-locked loop is connected to the input end of the voltage amplifier, and the output end of the battery is used to measure the phase difference between the voltage and the current of the battery, and thereby change the output signal accordingly. frequency. The phase-locked loop is formed by a phase comparator, a low-pass filter, and a voltage controlled oscillator. It may also include a display coupled to the phase locked loop to inform the user of the optimum operating frequency. The working procedure is as follows: at the beginning, the voltage control 'oscillator oscillates an AC signal, which is amplified by a voltage amplifier and sent to the battery to charge it; at the same time, the phase comparator measures the voltage and current phase difference of the battery. The phase difference is converted into a DC signal via a low-pass filter and used to change the frequency of the voltage-controlled oscillator output; thus repeating the above steps until the voltage-current phase difference of the battery is zero, and the voltage of the battery is The frequency at which the current phase difference is zero is the optimal operating frequency of the battery. A measuring device for optimal operating frequency of a battery, which is at least composed of a current amplification circuit, a phase locked loop and a battery, wherein the 'current amplification benefit' is connected to the output end of the phase locked loop, and the input end of the battery is used. To amplify the output signal of the phase-locked loop, and then charge the battery; the phase-locked loop is connected to the input end of the current amplifier, and the output end of the battery is used to measure the voltage and current phase difference of the battery, and change the output signal accordingly. Frequency of. The phase-locked loop is composed of a phase comparator, a low-pass filter, and a voltage controlled oscillator. It may also include a display coupled to the phase locked loop to inform the user of the optimum operating frequency. The working procedure is as follows: At the beginning, the voltage controlled oscillator will oscillate an AC signal, which is amplified by the current amplifier. 8 13 π 828
之，，電流g位J充同時，相位比較器會量測電池 Si讀1，並用以改變差會經由低通濾、波器整成二直 率〉路會鎖在某1率5控ϊ振盪器輸出的頻率；最後J |上’_率即為電池的最佳工g I、 種電池充雷备^ ϋ彳2法或裝置。二稀恭其採用上述電池最佳工作頻率之 【實:;二量測方法ίί;電系統’其採用上述電池最 5 鍍別器;〇U電圖也所其係由交流充電產生器〗0、 電，，產生器1〇 f夺_!〇和顯示器40所構成。其中該交 30¾率可由使用者池Λ?的交流電且該交流 ，欵模型，其暑變之。如弟lb圖所示’為電池 /息電池3〇]所椹屮 父流阻抗（AC impedance)302 ik 可量測到電以ΐ;/電池陰極接地’故量測電池！ 接交流充電產相δ會同於電池3〇的電壓相位。 以產生器10的電屨二弋r^30的電壓相位（也就是交 交ί窃4〇上。若顯干相位是，亚將該相位差顯示在 後二充電產生器dsC0頻、1不有相f差’則使用者改變At the same time, the current g-bit J is charged at the same time, the phase comparator will measure the battery Si read 1 and use it to change the difference through the low-pass filter, the wave device is integrated into two straightness> the road will lock at a certain rate 5 control ϊ oscillator The frequency of the output; the last J | upper '_ rate is the best work of the battery I, the battery charge and charge ^ ϋ彳 2 method or device. Second, it uses the best working frequency of the above battery [real:; two measurement method ίί; electric system's use the most 5 plating device of the above battery; 〇U electrogram is also used by the AC charging generator〗 , electric,, generator 1 〇 夺 夺 〇 显示器 显示器 显示器 显示器 显示器 显示器 显示器 显示器 显示器 显示器 显示器 显示器The exchange rate can be exchanged by the user's pool and the exchange, the model, and the heat change. As shown in the figure lb, 'Battery/Battery Battery 3', the AC impedance 302 ik can measure the electricity to ΐ; / the battery cathode is grounded, so measure the battery! The AC charging phase δ is the same as the voltage phase of the battery. The voltage phase of the generator 的 弋 ^ ^ ^ ^ ^ ^ ^ ^ ^ 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 f difference' then the user changes
領以巧。，使的電A ^ 土電池3〇的最佳工作頻率。，、電机相位差為零的 電壓充‘ =，Ϊ 一較佳實施例如第2圖所干^ 電50所組成L電J也3〇:顯示器 f電jj上1之頻率可由控制器5(^ίΠί 位。首匕產产^的電壓相位會同於雷來;周 父〜電壓充電產生器11會產生電Λΐίΐίΐ 1311828 池30充電。同時，相位差鑑別器20會量測電池30的電壓 相位與電流相位，用以得出相位差，並送回給控制器50。 若有相位差，控制器50則改變交流電壓充電產生器11的 輸出頻率，並再對電池30充電，並量測電池30的電壓與 電流相位差。如此重複上述步驟，直到電池3 0的電壓與電 流相位差為零。而該使電池3 0的電壓與電流相位差為零的 頻率即為電池30的最佳工作頻率，控制器50會將該最佳 工作頻率送至顯示器40，用以告知使用者該最佳工作頻 率〇 本發明之第二較佳實施例如第3圖所示。其是由交流 電流充電產生器12、相位差鑑別器20、電池30、顯示器 # 40和控制器50所組成。注意的是，用於電池充電的交流 電流充電產生器12之頻率可由控制器50來調整之，且交 流電電充電產生為12的電流相位會同於電池3 0的電流相 位。首先，交流電流充電產生器12會產生一交流電流對電 池30充電。同時，相位差鑑別器20會量測電池30的電壓 相位與電流相位，並將相位差送回給控制器50。若有相位 '差，則控制器50會改變交流電流充電產生器12的輸出頻 率，並再對電池30充電，並量測電池30的電壓相位與電 流相位。如此重複上述步驟，直到電池30的電壓與電流相 位差為零。而該使電池30的電壓與電流相位差為零的頻率 即為電池30的最佳工作頻率，控制器50會將該最佳工作 • 頻率送至顯示器40，用以告知使用者該最佳工作頻率。 本發明之第三較佳實施例如第4圖所示。其是由電壓 放大器60、鎖相迴路80、顯示器40和電池30所組成。而 該鎖相迴路80是由相位比較器801、低通濾波器802和電 壓控制振盪器803所組成，如圖5所示。一開始，電壓控 制振盪器803會振盪出一交流訊號，該訊號經電壓放大器 60放大後送至電池30對其進行充電。同時，相位比較器 801會量測電池30的電壓與電流相位差，該相位差會經由 低通濾波器802整成一直流訊號。該直流訊號會驅動電壓 控制振盪器803輸出的頻率往減少相位差的方向改變，最 後電池30的電壓與電流相位差為零，而該使電池30的電 壓與電流相位差為零的頻率即為電池30的最佳工作頻 1311828 率。鎖相迴路80中的低通濾波器802輸出的直流訊號會送 至顯示器40，用以告知使用者該最佳工作頻率。 本發明之第四較佳實施例如第6圖所示。其是由電流 ' 放大器70、鎖相迴路80、顯示器40和電池30所組成。而 該鎖相迴路80是由相位比較器801、低通濾波器802和電 壓控制振盪器803所組成，如圖5所示。一開始，電壓控 制振盪器803會振盪出一交流訊號，該訊號經電流放大器 70放大後送至電池30對其進行充電。同時，相位比較器 801會量測電池30的電壓與電流相位差，該相位差會經由 低通濾波器802整成一直流訊號。該直流訊號會驅動電壓 控制振盪器803輸出的頻率往減少相位差的方向改變，最 籲 後電池30的電壓與電流相位差為零，而該使電池30的電 壓與電流相位差為零的頻率即為電池30的最佳工作頻 率。鎖相迴路80中的低通濾波器802輸出的直流訊號會送 至顯示器40，用以告知使用者該最佳工作頻率。 【圖式簡單說明】 '第la圖：本發明所揭示之電池最佳工作頻率之量測方法及 其裝置方塊圖 第lb圖：電池等效模型 第2圖：本發明之第一較佳實施例 第3圖：本發明之第二較佳實施例 • 第4圖：本發明之第三較佳實施例 第5圖：鎖相迴路方塊圖 第6圖：本發明之第四較佳實施例 【主要元件符號說明】 10.. .交流充電產生器 11.. .交流電壓充電產生器 12.. .交流電流充電產生器 20.. .相位差鑑別器 30…電池 301.. .理想電池 302.. .交流阻抗 303…電流感測器 1311828 40.. .顯示器 50.. .控制器 60.. .電壓放大器 7 0...電流放大器 80.. .鎖相迴路 801.. .相位比較器 802.. .低通濾波器 803.. .電壓控制振盪器Take the clever. To make the electric A ^ earth battery 3 〇 the best working frequency. , the motor phase difference is zero voltage charge '=, Ϊ a preferred implementation, such as the second figure of the dry ^ electric 50 composed of L electric J also 3 〇: display f electric jj 1 frequency can be controlled by the controller 5 ( ^ίΠί. The voltage phase of the first production is the same as that of the Rays; the parent-voltage charging generator 11 generates electricity Λΐ ΐ ΐ 1311828 The pool 30 is charged. At the same time, the phase difference discriminator 20 measures the voltage phase of the battery 30. The current phase is used to derive the phase difference and is sent back to the controller 50. If there is a phase difference, the controller 50 changes the output frequency of the AC voltage charging generator 11, and then charges the battery 30, and measures the battery 30. The voltage and current are in phase difference. The above steps are repeated until the voltage and current phase difference of the battery 30 is zero, and the frequency at which the voltage and current phase difference of the battery 30 is zero is the optimal operating frequency of the battery 30. The controller 50 sends the optimal operating frequency to the display 40 to inform the user of the optimal operating frequency. The second preferred embodiment of the present invention is shown in FIG. 3. It is an AC current charging generator. 12, phase difference discriminator 20, battery 30 The display #40 and the controller 50 are composed. Note that the frequency of the AC current charging generator 12 for battery charging can be adjusted by the controller 50, and the AC current charging produces a current phase of 12 which is the same as the battery 30. First, the AC current charging generator 12 generates an alternating current to charge the battery 30. At the same time, the phase difference discriminator 20 measures the voltage phase and current phase of the battery 30 and sends the phase difference back to the controller. 50. If there is a phase 'difference, the controller 50 changes the output frequency of the alternating current charge generator 12, and then charges the battery 30, and measures the voltage phase and current phase of the battery 30. The above steps are repeated until the battery The voltage and current phase difference of 30 is zero, and the frequency at which the voltage and current phase difference of the battery 30 is zero is the optimum operating frequency of the battery 30, and the controller 50 sends the optimum operation frequency to the display 40. The third preferred embodiment of the present invention is shown in Fig. 4. It is composed of a voltage amplifier 60, a phase locked loop 80, a display 40, and The battery 30 is composed of a phase comparator 801, a low pass filter 802 and a voltage controlled oscillator 803, as shown in Fig. 5. Initially, the voltage controlled oscillator 803 oscillates out. The AC signal is amplified by the voltage amplifier 60 and sent to the battery 30 for charging. At the same time, the phase comparator 801 measures the voltage and current phase difference of the battery 30, and the phase difference is integrated into the low pass filter 802. The DC signal drives the frequency outputted by the voltage controlled oscillator 803 to change in the direction of decreasing the phase difference. Finally, the voltage and current phase difference of the battery 30 is zero, and the phase difference between the voltage and the current of the battery 30 is zero. The frequency is the optimum operating frequency of the battery 30, 1311828. The DC signal output by the low pass filter 802 in the phase locked loop 80 is sent to the display 40 to inform the user of the optimum operating frequency. A fourth preferred embodiment of the present invention is shown in Fig. 6. It consists of a current 'amplifier 70, a phase-locked loop 80, a display 40 and a battery 30. The phase locked loop 80 is composed of a phase comparator 801, a low pass filter 802, and a voltage controlled oscillator 803, as shown in Fig. 5. Initially, the voltage controlled oscillator 803 oscillates an AC signal which is amplified by the current amplifier 70 and sent to the battery 30 for charging. At the same time, the phase comparator 801 measures the voltage and current phase difference of the battery 30, and the phase difference is converted into a DC signal via the low pass filter 802. The DC signal drives the frequency outputted by the voltage controlled oscillator 803 to change in the direction of decreasing the phase difference. The voltage and current phase difference of the battery 30 is zero, and the frequency difference between the voltage and the current of the battery 30 is zero. That is, the optimal operating frequency of the battery 30. The DC signal output by the low pass filter 802 in the phase locked loop 80 is sent to the display 40 to inform the user of the optimum operating frequency. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a battery optimum operating frequency and a device thereof. FIG. 1b is a battery equivalent model. FIG. 2 is a first preferred embodiment of the present invention. Example 3: a second preferred embodiment of the present invention. FIG. 4 is a third preferred embodiment of the present invention. FIG. 5 is a block diagram of a phase locked loop. FIG. 6 is a fourth preferred embodiment of the present invention. [Main component symbol description] 10.. AC charging generator 11. AC voltage charging generator 12. AC current charging generator 20. Phase difference discriminator 30... Battery 301.. Ideal battery 302 .. . AC Impedance 303... Current Sense 1311828 40.. Display 50.. Controller 60.. Voltage Amplifier 7 0... Current Amplifier 80.. Phase Locked Circuit 801.. Phase Comparator 802.. . low pass filter 803.. voltage controlled oscillator