WO2018035931A1 - 蓄电池端电压检测装置 - Google Patents

蓄电池端电压检测装置 Download PDF

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WO2018035931A1
WO2018035931A1 PCT/CN2016/101150 CN2016101150W WO2018035931A1 WO 2018035931 A1 WO2018035931 A1 WO 2018035931A1 CN 2016101150 W CN2016101150 W CN 2016101150W WO 2018035931 A1 WO2018035931 A1 WO 2018035931A1
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resistor
transformer
terminal voltage
module
battery terminal
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PCT/CN2016/101150
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English (en)
French (fr)
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刘庆礼
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广州市竣达智能软件技术有限公司
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)

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  • the invention relates to the technical field of battery inspection, and in particular to a battery terminal voltage detecting device.
  • the battery terminal voltage detecting devices currently used have the following types:
  • the contacts of the relay are used to connect the battery cells to be tested to a common signal sampling loop, and the other batteries are suspended at both ends to realize each of the battery packs.
  • the terminal voltage of the battery cell is sampled.
  • the disadvantage of this method is that the relay operates at a slow speed and has a limited number of mechanical lifetimes and large operational noise.
  • a serial analog-to-digital converter ADC is used to convert the battery terminal voltage into a serial format digital signal, which is isolated and transmitted to the serial data bus through a digital optocoupler, and the battery voltage of each data channel is read back by the DSP.
  • the disadvantage of this method is that each serial ADC requires a separate auxiliary power supply, the signal conditioning circuit, the digital signal isolation structure is complicated, and the cost of the serial analog-to-digital converter ADC is high.
  • the isolated battery terminal voltage detection can be realized by using a linear optocoupler, but the cost is too high.
  • Digital optocoupler plus compensation circuit can also be used instead, but the disadvantage of digital optocoupler for analog signal is that the linearity of input and output is poor, and it is affected by temperature. It needs to correct the temperature drift of digital optocoupler and nonlinearity. For compensation, the circuit structure is more complicated.
  • a resistor is used to form a voltage dividing network to attenuate the voltage of each battery connection point of the entire battery pack to an acceptable level for the electronic analog switch.
  • the circuit is simple in structure, but the circuit The measurement loop is not isolated from the battery circuit, there is a safety hazard, and the gradient attenuation caused by the network resistor will cause the sampling accuracy to decrease.
  • the battery terminal voltage detecting device in the conventional technology has problems of high cost, complicated circuit structure, low isolation level, and low reliability.
  • the present invention provides a battery terminal voltage detecting device, which realizes the isolation measurement of the battery terminal voltage through a transformer, has low cost, simple circuit structure, and high isolation level and reliability.
  • a battery terminal voltage detecting device includes: an excitation current source module, a transformer, a diode, a capacitor, a first resistor, and a second resistor;
  • the excitation current source module outputs an excitation current to a primary winding of the transformer
  • One end of the secondary winding of the transformer is connected to the anode of the diode, the other end is connected to the first end of the capacitor, and the second end of the capacitor is connected to the cathode of the diode;
  • the first end of the capacitor is connected to the negative pole of the battery under test through the first resistor, and the second end of the capacitor is connected to the anode of the battery under test through the second resistor.
  • the battery terminal voltage detecting device of the present invention realizes the detection of the battery terminal voltage by applying an exciting current to the transformer, and the transformer has a very mature processing technology, and it is easy to achieve a high level of isolation.
  • the transformer is a static magnetic induction element with no mechanical action and therefore long-lasting reliability.
  • the transformer in this embodiment is easy to realize automated processing in batches, and the material is a common material, which has a good cost effect. Therefore, the battery terminal voltage detecting device of the present invention can realize the patrol detection amount of the multi-channel battery with low cost, high isolation and reliability, and can realize voltage holding by using the resistor-capacitor network, thereby further reducing the measurement circuit pair. The influence of the circuit under test ensures the detection accuracy.
  • FIG. 1 is a schematic diagram showing the circuit structure of a battery terminal voltage detecting device based on relay switching
  • FIG. 2 is a schematic diagram showing the circuit structure of a battery terminal voltage detecting device based on serial analog-to-digital conversion
  • FIG. 3 is a schematic diagram showing the circuit structure of a battery terminal voltage detecting device based on linear optocoupler or digital optocoupler compensation;
  • FIG. 4 is a schematic circuit diagram of a battery terminal voltage detecting device based on a resistor network
  • FIG. 5 is a schematic diagram showing an optional circuit structure of a battery terminal voltage detecting device of the present invention.
  • FIG. 6 is a schematic view showing another alternative circuit structure of the battery terminal voltage detecting device of the present invention.
  • FIG. 7 is a schematic structural view of an excitation current source module according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing another optional circuit structure of the battery terminal voltage detecting device of the present invention.
  • the battery terminal voltage detecting device in this embodiment includes: an excitation current source module 10, a transformer T, and a diode D1.
  • the excitation current source module 10 outputs an excitation current to the primary winding of the transformer T.
  • One end of the secondary winding of the transformer T is connected to the anode of the diode D1, the other end is connected to the first end a of the capacitor C1, and the second end b of the capacitor C2 is connected to the cathode of the diode D1.
  • the first end a of the capacitor C1 is connected to the negative pole of the battery under test 100 through the first resistor R1, and the second end b of the capacitor C1 is connected to the anode of the battery under test 100 through the second resistor R2.
  • the battery 100 to be tested is charged to the capacitor C1 through the first resistor R1 and the second resistor R2. After the charging reaches equilibrium, the voltage across the capacitor C1 is measured. The terminal voltage U x of the battery 100 is equal.
  • the excitation current source module 10 can output an excitation current to the primary winding of the transformer T, the transformer T couples the excitation current to the secondary winding, and the capacitor C1 through the diode D1 Charge it.
  • the varying voltage of the winding is used to detect the voltage of the battery terminal 100 to be tested.
  • the battery terminal voltage detecting device in this embodiment is used to detect the terminal voltage of the battery
  • the battery terminal voltage detecting device is first calibrated, that is, the battery 100 to be tested in FIG. 5 is replaced with a known voltage source U 0 .
  • the excitation current source module 10 outputs the excitation current to the primary winding of the transformer T.
  • the variation voltage generated by the primary winding of the transformer T is detected, and the linear proportional coefficient k is calculated by the variation voltage and U 0 .
  • the excitation current source module 10 When detecting the terminal voltage of the battery under test 100, the excitation current source module 10 outputs the excitation current to the primary winding of the transformer T, and detects the variation voltage generated by detecting the primary winding of the transformer T, and then calculates the linear proportional coefficient k. The terminal voltage of the battery 100 to be tested is output.
  • the battery terminal voltage detecting device in this embodiment realizes the detection of the battery terminal voltage through the transformer, and the transformer has a very mature processing technology, and it is easy to achieve a high level of isolation.
  • the transformer is a static magnetic induction element with no mechanical action and therefore long-lasting reliability.
  • the transformer in this embodiment is easy to realize automated processing in batches, and the material is a common material, which has a good cost effect.
  • the battery terminal voltage detecting device in this embodiment further includes a third resistor R3 and a filtering module 20.
  • the third resistor R3 and the filter module 20 are connected in series and connected in parallel with the primary winding of the transformer T.
  • the voltage across the primary winding of the transformer T is divided by the third resistor R3 and input to the filter module 20, and then the terminal voltage of the battery under test 100 can be calculated by detecting the voltage output from the filter module 20.
  • the battery terminal voltage detecting device in this embodiment may further include an AD conversion module 30 and a processing module 40, wherein the processing module 40 may Use MCU, CPU, FPGA and other devices.
  • the input of the AD conversion module 30 is connected to the output of the filter module 20, and the output of the AD conversion module 30 is connected to the input of the processing module 40.
  • the AD conversion module 30 performs analog-to-digital conversion on the voltage signal output from the filter module 20 to generate a digital signal, and sends the digital signal to the processing module 40.
  • the processing module 40 performs processing calculation according to the digital signal input by the AD conversion module 30 and the known voltage source U 0 to determine the linear scale factor k, and then When the terminal voltage of the battery 100 is detected, the processing module 40 automatically calculates the terminal voltage of the battery under test 100 according to the digital signal input by the AD conversion module and the linear proportional coefficient k, and outputs the calculation result.
  • the excitation current source module 10 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, an amplification module 101, and a controllable switch 102.
  • the input end of the amplification module 101 is connected to the first end c of the fourth resistor R4, and the output end is sequentially grounded through the fifth resistor R5, the controllable switch 102, the sixth resistor R6, and the primary winding of the transformer T; the fourth resistor
  • the second end d of R4 is externally connected to the excitation pulse. As shown in FIG.
  • an excitation pulse is applied to the fourth resistor R4, amplified by the amplification module 101, and then passed through a current limiting action of the fifth resistor R5 and the sixth resistor R6 to the transformer T.
  • the primary winding applies an excitation current.
  • the amplification module 101 can select various amplification circuits or amplifier components. Alternatively, as shown in FIG. 8, the amplification module 101 includes a first NPN transistor Q1, a base of the first NPN transistor Q1, and a fourth resistor R4. The first end c is connected, the collector is connected to the controllable switch 102 through the fifth resistor R5, and the emitter is grounded.
  • the controllable switch 102 can employ various types of controllable switching devices such as relays, MOSFETs, IGBTs, and the like.
  • the controllable switch 102 includes a seventh resistor R7 and a second NPN type. Transistor Q2.
  • the base of the second NPN transistor Q2 is connected to the collector of the first NPN transistor Q1 through the fifth resistor R5; the collector of the second NPN transistor Q2 is externally connected to the voltage source VDD, and passes through the seventh resistor R7 and the second NPN.
  • the base of the transistor Q2 is connected; the emitter of the second NPN transistor Q2 is grounded through the sixth resistor R6, the primary winding of the transformer.
  • the filtering module uses an RC filter circuit, including a capacitor C2 and a resistor R8 connected in parallel, and the RC filter circuit outputs a voltage signal to the AD conversion module 30 .
  • the battery terminal voltage detecting device of the present invention uses a transformer to perform DC voltage isolation measurement, and can realize the patrol detection amount of the multi-channel battery with low cost, high isolation and reliability, and utilizes the resistor.
  • the capacitor network realizes voltage maintenance, which further reduces the influence of the measurement circuit on the circuit under test and ensures the detection accuracy.

Abstract

一种蓄电池端电压检测装置，包括：激励电流源模块（10）、变压器（T）、二极管（D1）、电容（C1）、第一电阻（R1）以及第二电阻（R2）；所述激励电流源模块（10）输出激励电流到所述变压器（T）的初级绕组；所述变压器（T）的次级绕组的一端与所述二极管（D1）的阳极连接，另一端与所述电容（C1）的第一端连接，所述电容（C1）的第二端与所述二极管（D1）的阴极连接；所述电容（C1）的第一端通过所述第一电阻（R1）与被测蓄电池（100）的负极连接，所述电容（C1）的第二端通过所述第二电阻（R2）与被测蓄电池（100）的正极连接。通过变压器（T）实现蓄电池（100）端电压的隔离测量，成本低、电路结构简单，且隔离等级和可靠性均较高。

Description

蓄电池端电压检测装置 技术领域
本发明涉及蓄电池巡检技术领域，特别是涉及一种蓄电池端电压检测装置。
背景技术
蓄电池在长时间使用过程中往往会出现端电压不均匀，影响通信安全。因此，对蓄电池实施端电压检测具有重要意义。目前采用的蓄电池端电压检测装置有以下几种：
(1)基于继电器切换的蓄电池端电压检测装置
参照图1所示，通过轮流驱动继电器C1到Cn，采用继电器的触点将被测的蓄电池单体接入一个共用的信号采样回路，其他的蓄电池两端悬空，实现对蓄电池组中的每一个蓄电池单体的端电压进行采样，这种方法的缺点是继电器的动作速度慢，并存在有限次数的机械寿命与较大的动作噪声。
(2)基于串行模数转换的蓄电池端电压检测装置
参照图2所示，采用串行模数转换器ADC把蓄电池端电压转化为串行格式的数字信号，通过数字光耦隔离传输到串行数据总线，由DSP读回每一数据通道的电池电压。这种方法的缺点是每一路串行ADC需要独立的辅助电源，信号调理电路、数字信号隔离结构比较复杂，并且串行模数转换器ADC的成本偏高。
(3)基于线性光耦或者数字光耦补偿的蓄电池端电压检测装置
参照图3所示，采用线性光耦可实现隔离的蓄电池端电压检测，但是成本过高。也可采用数字光耦外加补偿电路替代，但对于模拟信号来说数字光耦的缺点是输入输出的线性较差，并且受温度影响较大，需要对数字光耦的温度漂移进行校正和非线性进行补偿，电路结构比较复杂。
(4)基于电阻网络的蓄电池端电压检测装置
参照图4所示，采用电阻构成分压网络，把整个蓄电池组的各个蓄电池连接点电压衰减到电子模拟开关可以接受的程度。该电路结构简单，但是该电路 测量回路与蓄电池回路并不隔离，存在安全隐患，并且采用网络电阻进行梯度衰减会造成采样精度的递减。
综上所述，传统技术中的蓄电池端电压检测装置存在着成本高、电路结构复杂、隔离等级低、可靠性低等问题。
发明内容
基于此，为解决现有技术中的问题，本发明提供一种蓄电池端电压检测装置，通过变压器实现蓄电池端电压的隔离测量，成本低、电路结构简单，且隔离等级和可靠性均较高。
为实现上述技术目的，本发明实施例采用以下技术方案：
一种蓄电池端电压检测装置，包括：激励电流源模块、变压器、二极管、电容、第一电阻以及第二电阻；
所述激励电流源模块输出激励电流到所述变压器的初级绕组；
所述变压器的次级绕组的一端与所述二极管的阳极连接，另一端与所述电容的第一端连接，所述电容的第二端与所述二极管的阴极连接；
所述电容的第一端通过所述第一电阻与被测蓄电池的负极连接，所述电容的第二端通过所述第二电阻与被测蓄电池的正极连接。
本发明的蓄电池端电压检测装置通过向变压器施加激励电流实现蓄电池端电压的检测，而变压器具有非常成熟的加工工艺，很容易实现高等级的隔离度。变压器为静态磁感应元件，不存在机械动作，因此具有持久的可靠性。另外，本实施例中的变压器很容易实现批量的自动化加工，且材料为普通材料，具有很好地成本效应。因此，本发明的蓄电池端电压检测装置能以较低的成本、较高的隔离度和可靠性实现对多路蓄电池的巡检测量，并且可利用电阻电容网络实现电压保持，进一步降低测量电路对被测电路的影响，保障了检测精度。
附图说明
图1为基于继电器切换的蓄电池端电压检测装置的电路结构示意图；
图2为基于串行模数转换的蓄电池端电压检测装置的电路结构示意图；
图3为基于线性光耦或者数字光耦补偿的蓄电池端电压检测装置的电路结构示意图；
图4为基于电阻网络的蓄电池端电压检测装置的电路结构示意图；
图5是本发明的蓄电池端电压检测装置一种可选的电路结构示意图；
图6是本发明的蓄电池端电压检测装置另一种可选的电路结构示意图；
图7是本发明实施例中激励电流源模块的结构示意图；
图8是本发明的蓄电池端电压检测装置又一种可选的电路结构示意图。
具体实施方式
下面将结合较佳实施例及附图对本发明的内容作进一步详细描述。显然，下文所描述的实施例仅用于解释本发明，而非对本发明的限定。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。应当理解的是，尽管在下文中采用术语″第一″、″第二″等来描述各种信息，但这些信息不应限于这些术语，这些术语仅用来将同一类型的信息彼此区分开。例如，在不脱离本发明范围的情况下，″第一″信息也可以被称为″第二″信息，类似的，″第二″信息也可以被称为″第一″信息。另外还需要说明的是，为了便于描述，附图中仅示出了与本发明相关的部分而非全部内容。
图5是本发明的蓄电池端电压检测装置在一个实施例中的原理示意图，如图5所示，本实施例中的蓄电池端电压检测装置包括：激励电流源模块10、变压器T、二极管D1、电容C1、第一电阻R1以及第二电阻R2。其中，激励电流源模块10输出激励电流到变压器T的初级绕组。变压器T的次级绕组的一端与二极管D1的阳极连接，另一端与电容C1的第一端a连接，电容C2的第二端b与二极管D1的阴极连接。
如图5所示，电容C1的第一端a通过第一电阻R1与被测蓄电池100的负极连接，电容C1的第二端b通过第二电阻R2与被测蓄电池100的正极连接。
将本实施例中的蓄电池端电压检测装置与被测蓄电池100后，被测蓄电池 100通过第一电阻R1、第二电阻R2向电容C1充电，充电达到平衡后，电容C1两端的电压与被测蓄电池100的端电压Ux相等。
由于变压器T只能传递交流信号，为了实现直流信号的测量，可通过激励电流源模块10向变压器T的初级绕组输出激励电流，变压器T将激励电流耦合到次级绕组，通过二极管D1对电容C1进行充电。
当变压器T2次级绕组产生的感应电压低于电容C1两端的电压Ux时，二极管D1中是没有电流通过的，激励电流源模块10向变压器T的初级绕组输出激励电流后，变压器T2次级绕组的电压快速上升，将通过二极管D2对电容C1充电，电容C1两端的电压从Ux上升至Ux0，当激励结束后，电容C1对被测蓄电池100放电，电容C1两端电压恢复至Ux。基于变压器的电磁感应耦合原理，在整个过程中，变压器T的初级绕组也将会产生一个和电容C1两端电压呈线性比例关系的变化电压，即：随着电容C1两端的电压由Ux上升至Ux0，变压器T的初级绕组电压也将同步的从UN上升至UN0，且UN/Ux＝UN0/Ux0，因此只要找出线性比例系数，就能通过检测变压器T初级绕组的变化电压来实现被测蓄电池100端电压的检测。
因此，在使用本实施例中的蓄电池端电压检测装置来检测蓄电池的端电压时，先对蓄电池端电压检测装置进行校准，即将图5中被测蓄电池100替换为一个已知的电压源U0，然后通过激励电流源模块10输出激励电流到变压器T的初级绕组，此时检测变压器T初级绕组产生的变化电压，通过该变化电压与U0计算出线性比例系数k。在对被测蓄电池100的端电压进行检测时，通过激励电流源模块10输出激励电流到变压器T的初级绕组，并检测检测变压器T初级绕组产生的变化电压，然后结合线性比例系数k就能计算出被测蓄电池100的端电压。
本实施例中的蓄电池端电压检测装置通过变压器实现蓄电池端电压的检测，而变压器具有非常成熟的加工工艺，很容易实现高等级的隔离度。变压器为静态磁感应元件，不存在机械动作，因此具有持久的可靠性。另外，本实施例中的变压器很容易实现批量的自动化加工，且材料为普通材料，具有很好地成本效应。
进一步的，为了提高检测精度，仍参照图5所示，本实施例中的蓄电池端电压检测装置还包括第三电阻R3、滤波模块20。第三电阻R3和滤波模块20串联连接后与变压器T的初级绕组并联连接。这样变压器T的初级绕组两端的电压经第三电阻R3分压后输入到滤波模块20，然后只要检测滤波模块20输出的电压就可以计算出被测蓄电池100的端电压。
较佳的，为了自动输出检测结果，参照图6所示，且一并参照图5，本实施例中的蓄电池端电压检测装置还可包括AD转换模块30以及处理模块40，其中处理模块40可采用MCU、CPU、FPGA等装置。AD转换模块30的输入端与滤波模块20的输出端连接，AD转换模块30的输出端与处理模块40的输入端连接。AD转换模块30对滤波模块20输出的电压信号进行模数转换，生成数字信号，并将数字信号送入处理模块40。参照上文对于校准过程的描述，在校准时，处理模块40依据AD转换模块30输入的数字信号以及已知的电压源U0进行处理计算，就能确定线性比例系数k，然后在对被测蓄电池100的端电压进行检测时，处理模块40依据AD转换模块输入的数字信号以及线性比例系数k就能自动计算出被测蓄电池100的端电压，并输出计算结果。
在一种可选的实施方式中，参照图7所示，激励电流源模块10包括第四电阻R4、第五电阻R5、第六电阻R6、放大模块101以及可控开关102。其中，放大模块101的输入端与第四电阻R4的第一端c连接，输出端依次通过第五电阻R5、可控开关102、第六电阻R6以及变压器T的初级绕组后接地；第四电阻R4的第二端d外接激励脉冲。如图7所示，可控开关102导通后，在第四电阻R4处施加激励脉冲，经放大模块101放大后再通过第五电阻R5和第六电阻R6的限流作用，可向变压器T的初级绕组施加激励电流。其中，放大模块101可选用各种放大电路或放大器件，可选的，参照图8所示，放大模块101包括第一NPN型三极管Q1，第一NPN型三极管Q1的基极与第四电阻R4的第一端c连接，集电极通过第五电阻R5与可控开关102连接，发射极接地。
可控开关102可采用各类可控制的开关器件例如继电器、MOSFET、IGBT等等。可选的，参照图8所示，可控开关102包括第七电阻R7和第二NPN型 三极管Q2。第二NPN型三极管Q2的基极通过第五电阻R5与第一NPN型三极管Q1的集电极连接；第二NPN型三极管Q2的集电极外接电压源VDD，且通过第七电阻R7与第二NPN型三极管Q2的基极连接；第二NPN型三极管Q2的发射极通过第六电阻R6、变压器的初级绕组后接地。
可选的，参照图8所示，滤波模块采用RC滤波电路，包括并联连接的电容C2和电阻R8，RC滤波电路输出电压信号至AD转换模块30。
综上所述，本发明的蓄电池端电压检测装置采用变压器进行直流电压的隔离测量，能以较低的成本、较高的隔离度和可靠性实现对多路蓄电池的巡检测量，并且利用电阻电容网络实现电压保持，进一步降低了测量电路对被测电路的影响，保障了检测精度。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (9)

  1. 一种蓄电池端电压检测装置，其特征在于，包括：激励电流源模块、变压器、二极管、电容、第一电阻以及第二电阻；
    所述激励电流源模块输出激励电流到所述变压器的初级绕组；
    所述变压器的次级绕组的一端与所述二极管的阳极连接，另一端与所述电容的第一端连接，所述电容的第二端与所述二极管的阴极连接；
    所述电容的第一端通过所述第一电阻与被测蓄电池的负极连接，所述电容的第二端通过所述第二电阻与被测蓄电池的正极连接。
  2. 根据权利要求1所述的蓄电池端电压检测装置，其特征在于，还包括第三电阻、滤波模块；
    所述第三电阻和所述滤波模块串联连接后与所述变压器的初级绕组并联连接；所述变压器的初级绕组两端的电压经所述第三电阻分压后输入所述滤波模块。
  3. 根据权利要求2所述的蓄电池端电压检测装置，其特征在于，还包括AD转换模块和处理模块；
    所述AD转换模块的输入端与所述滤波模块的输出端连接，所述AD转换模块的输出端与所述处理模块的输入端连接。
  4. 根据权利要求1至3中任一项所述的蓄电池端电压检测装置，其特征在于，所述激励电流源模块包括第四电阻、第五电阻、第六电阻、放大模块以及可控开关；
    所述放大模块的输入端与所述第四电阻的第一端连接，输出端依次通过所述第五电阻、所述可控开关、所述第六电阻以及所述变压器的初级绕组后接地；所述第四电阻的第二端外接激励脉冲。
  5. 根据权利要求4所述的蓄电池端电压检测装置，其特征在于，所述放大模块包括第一NPN型三极管；
    所述第一NPN型三极管的基极与所述第四电阻的第一端连接，集电极通过所述第五电阻与所述可控开关连接，发射极接地。
  6. 根据权利要求5所述的蓄电池端电压检测装置，其特征在于，所述可控开关包括第七电阻和第二NPN型三极管；
    所述第二NPN型三极管的基极通过所述第五电阻与所述第一NPN型三极管的集电极连接；所述第二NPN型三极管的集电极外接电压源，且通过所述第七电阻与所述第二NPN型三极管的基极连接；所述第二NPN型三极管的发射极通过所述第六电阻、所述变压器的初级绕组后接地。
  7. 根据权利要求2或3所述的蓄电池端电压检测装置，其特征在于，所述滤波模块为RC滤波电路。
  8. 根据权利要求4所述的蓄电池端电压检测装置，其特征在于，所述可控开关为继电器。
  9. 根据权利要求3所述的蓄电池端电压检测装置，其特征在于，所述处理模块为MCU。
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