CN210835177U - Battery detection circuit - Google Patents
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- CN210835177U CN210835177U CN201921162327.3U CN201921162327U CN210835177U CN 210835177 U CN210835177 U CN 210835177U CN 201921162327 U CN201921162327 U CN 201921162327U CN 210835177 U CN210835177 U CN 210835177U
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Abstract
The utility model provides a battery detection circuitry, include: the constant current driving circuit comprises an alternating current constant current driving module, a constant value resistor R1, a first blocking capacitor module, a second blocking capacitor module, a first voltage acquisition module and a second voltage acquisition module; the input end of the alternating current constant current driving module is used for being connected with a power supply, the output end of the alternating current constant current driving module is used for being connected with the anode of a battery to be detected, the first end of the fixed value resistor R1 is used for being connected with the cathode of the battery to be detected, the second end of the fixed value resistor R1 is used for being grounded, the first voltage acquisition module is used for being connected with the battery to be detected through the first blocking capacitor module, the second voltage acquisition module is connected with the fixed value resistor R1 through the second blocking capacitor module, the alternating current constant current driving module is used for supplying an alternating current constant current source to the battery to be detected and the fixed value resistor, alternating current voltages at two ends of the battery to be detected and at two ends of the fixed value resistor are acquired, and a direct current component of the battery to be detected is filtered out.
Description
Technical Field
The utility model relates to a battery technology field especially relates to a battery detection circuitry.
Background
Lead acid battery is as the independent DC power supply of transmission, protection, control and communication, by the wide application in distribution network automation system, play the effect of "independent power supply" when taking place AC power supply trouble or normal commercial power interrupt, for closing a floodgate operating device divide-shut brake, distribution terminal equipment operation provides the electric energy, the realization of the state directness relation distribution automation function of distribution terminal's battery, just can carry out corresponding fortune dimension to the battery to the state of accurate understanding battery, eliminate defect and hidden danger, ensure the realization of distribution automation function. Therefore, the stable, reliable and safe operation of the storage battery has a very important significance for the automation of the power distribution network, and for this purpose, the performance of the battery needs to be detected.
The existing battery performance detection device mainly utilizes a direct current discharge method and an alternating current injection method. The principle of the dc discharge method is to make the battery in a static (or off-line) state, discharge a large current to an external load, measure the voltage and discharge current of the battery, and calculate the ratio of the voltage and the current to obtain the internal resistance of the battery. The ac injection method is to apply small-amplitude sinusoidal voltage disturbance signals with specific frequency to two sections of the battery, measure the ratio of the ac voltage and the current signal at the frequency as the ac impedance of the battery at the frequency, where the impedance cannot reflect the complete impedance spectrum characteristics of the battery, and therefore cannot be used as a basis for accurately evaluating the battery state.
SUMMERY OF THE UTILITY MODEL
Therefore, a battery detection circuit is needed to solve the problem that the traditional battery detection method cannot accurately detect the performance of the battery.
A battery detection circuit comprising: the constant current driving circuit comprises an alternating current constant current driving module, a constant value resistor R1, a first blocking capacitor module, a second blocking capacitor module, a first voltage acquisition module and a second voltage acquisition module; the input end of the alternating current constant current driving module is used for being connected with a power supply, the output end of the alternating current constant current driving module is used for being connected with the anode of a battery to be tested, the first end of the fixed value resistor R1 is used for being connected with the cathode of the battery to be tested, the second end of the fixed value resistor R1 is used for being grounded, the first voltage acquisition module is used for being connected with the two ends of the battery to be tested through the first blocking capacitor module, and the second voltage acquisition module is connected with the two ends of the fixed value resistor R1 through the second blocking capacitor module.
In one embodiment, the ac constant current driving module includes: a power amplifier U1, a triode Q1, a triode Q2, a current-limiting resistor R2 and a signal follower U2, the input end of the power amplifier U1 is used for connecting the power supply, the output end of the power amplifier U1 is respectively connected with the base electrode of the triode Q1 and the base electrode of the triode Q2, the collector of the transistor Q1 is used for connecting a first power supply, the emitter of the transistor Q1 is connected with the emitter of the transistor Q2, the collector of the triode Q2 is used for connecting a second power supply, the emitter of the triode Q1 is connected with the first end of the current limiting resistor R2, the second end of the current limiting resistor R2 is used for being connected with the anode of the battery to be tested, the second end of the current limiting resistor R2 is also connected with the non-inverting input end of the signal follower U2, the inverting input and output of the signal follower U2 are connected to the input of the power amplifier U1.
In one embodiment, the ac constant current driving module further includes a capacitor C1, and the second end of the current limiting resistor R2 is used to be connected to the positive electrode of the battery to be tested through the capacitor C1.
In one embodiment, the battery detection circuit further includes a frequency synthesis module, an input end of the frequency synthesis module is used for connecting the power supply, and an output end of the frequency synthesis module is connected with an input end of the alternating current constant current driving module.
In one embodiment, the battery detection circuit further includes a first signal amplification module and a second signal amplification module, an input end of the first signal amplification module is used for being connected with two ends of the battery to be detected through the first blocking capacitor module, an output end of the first signal amplification module is connected with an input end of the first voltage acquisition module, an input end of the second signal amplification module is connected with two ends of the fixed value resistor R1 through the second blocking capacitor module, and an output end of the second signal amplification module is connected with the second voltage acquisition module.
In one embodiment, the first dc blocking capacitor module includes a capacitor C2 and a capacitor C3, a positive phase input terminal of the first signal amplifying module is configured to be connected to the positive electrode of the battery to be tested through the capacitor C2, and a negative phase input terminal of the first signal amplifying module is configured to be connected to the negative electrode of the battery to be tested through the capacitor C3.
In one embodiment, the second dc blocking capacitor module includes a capacitor C4 and a capacitor C5, a positive input terminal of the second signal amplifying module is connected to the first terminal of the fixed resistor R1 through the capacitor C4, and a negative input terminal of the second signal amplifying module is connected to the second terminal of the fixed resistor R1 through the capacitor C5.
In one embodiment, the battery detection circuit further includes a first filtering module and a second filtering module, an output terminal of the first signal amplifying module is connected to an input terminal of the first filtering module, and an output terminal of the first filtering module is connected to the first voltage collecting module.
In one embodiment, the battery detection circuit further includes a second filtering module, an output terminal of the second signal amplifying module is connected to an input terminal of the second filtering module, and an output terminal of the second filtering module is connected to the second voltage collecting module.
In one embodiment, the first voltage acquisition module and the second voltage acquisition module are both analog-to-digital converters.
According to the battery detection circuit, the alternating current constant current driving module is arranged to provide the same alternating current constant current source for the battery to be detected and the fixed value resistor, then alternating current voltages at two ends of the battery to be detected and two ends of the fixed value resistor are collected, direct current components of the battery to be detected are filtered, alternating current impedance of the battery is accurately obtained, and accurate detection of performance of the battery can be achieved.
Drawings
FIG. 1 is a schematic diagram of a battery detection circuit according to an embodiment;
FIG. 2 is a circuit schematic of a battery detection circuit in one embodiment;
FIG. 3 is a schematic diagram of a battery detection circuit according to another embodiment;
FIG. 4 is a circuit schematic of a frequency synthesis module in one embodiment;
FIG. 5 is a schematic circuit diagram of an AC constant current driver module according to an embodiment;
FIG. 6a is a schematic circuit diagram of a first blocking capacitor module and a first signal amplifying module according to an embodiment;
FIG. 6b is a schematic circuit diagram of a second blocking capacitor module and a second signal amplifying module according to an embodiment;
FIG. 7a is a schematic circuit diagram of a first filtering module in one embodiment;
FIG. 7b is a circuit schematic of a second filtering module in one embodiment;
FIG. 8 is a circuit schematic of a first voltage acquisition module in one embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
For example, there is provided a battery detection circuit comprising: the constant current driving circuit comprises an alternating current constant current driving module, a constant value resistor R1, a first blocking capacitor module, a second blocking capacitor module, a first voltage acquisition module and a second voltage acquisition module; the input end of the alternating current constant current driving module is used for being connected with a power supply, the output end of the alternating current constant current driving module is used for being connected with the anode of a battery to be tested, the first end of the constant value resistor R1 is used for being connected with the cathode of the battery to be tested, the second end of the constant value resistor R1 is used for being grounded, the first voltage acquisition module is used for being connected with the two ends of the battery to be tested through the first blocking capacitor module, and the second voltage acquisition module is connected with the two ends of the constant value resistor R1 through the second blocking capacitor module.
According to the battery detection circuit, the alternating current constant current driving module is arranged to provide the same alternating current constant current source for the battery to be detected and the fixed value resistor, then alternating current voltages at two ends of the battery to be detected and two ends of the fixed value resistor are collected, direct current components of the battery to be detected are filtered, alternating current impedance of the battery is accurately obtained, and accurate detection of performance of the battery can be achieved.
In one embodiment, referring to fig. 1, a battery detection circuit 10 is provided, which includes: the constant current driving circuit comprises an alternating current constant current driving module 100, a constant value resistor R1, a first blocking capacitor module 210, a second blocking capacitor module 220, a first voltage acquisition module 310 and a second voltage acquisition module 320; the input end of the alternating current constant current driving module 100 is used for being connected with a power supply, the output end of the alternating current constant current driving module 100 is used for being connected with the positive electrode of the battery 110 to be tested, the first end of the fixed value resistor R1 is used for being connected with the negative electrode of the battery 110 to be tested, the second end of the fixed value resistor R1 is used for being grounded, the first voltage acquisition module 310 is used for being connected with the two ends of the battery 110 to be tested through the first blocking capacitor module 210, and the second voltage acquisition module 320 is connected with the two ends of the fixed value resistor R1 through the second blocking capacitor module 220.
Specifically, the ac constant current driving module is an ac constant current source, that is, a power source capable of generating an ac current that is relatively constant, an output end of the ac constant current driving module is connected to the battery to be tested and the fixed resistor, and the ac constant current driving module is configured to provide a constant ac current to the battery to be tested and the fixed resistor, so that currents flowing through the battery to be tested and the fixed resistor are equal.
Specifically, the first blocking capacitor module and the first blocking capacitor module have the function of passing alternating current and direct current, and can isolate direct current of the battery, namely the first blocking capacitor module is used for isolating direct current of the battery to be detected from the first voltage acquisition module, so that the first voltage acquisition module can accurately acquire alternating current voltage at two ends of the battery to be detected, the second blocking capacitor module is used for isolating direct current of a constant value resistor from the second voltage acquisition module, so that the second voltage acquisition module can accurately acquire alternating current voltage at two ends of the constant value resistor, and thus, direct current component interference of the battery can be avoided by arranging the first blocking capacitor module and the second blocking capacitor module, and alternating current impedance of the battery can be accurately measured.
Specifically, the first voltage acquisition module is used for acquiring alternating voltage at two ends of a battery to be detected, and the second voltage acquisition module is used for acquiring alternating voltage at two ends of the constant value resistor R1.
Specifically, because the battery to be tested is connected in series with the constant value resistor, the currents flowing through the battery to be tested and the constant value resistor are equal,thus, according to the alternating voltage U at the two ends of the battery to be testedbAC voltage U at two ends of constant value resistorrAnd the resistance value R of the constant value resistor0Then the AC impedance Z of the battery to be measured can be calculatedbComprises the following steps:
it should be understood that the ac impedance of the battery can directly reflect the performance condition of the battery, the smaller the ac impedance of the battery, the better the performance of the battery, and the larger the ac impedance of the battery, the closer the battery is to the scrapped state, i.e., the worse the performance of the battery, so that the performance condition of the battery can be accurately detected by accurately measuring the ac impedance of the battery.
Specifically, the battery detection power in this embodiment is suitable for detecting the performance of the lead-acid battery, that is, the battery to be detected in this embodiment is the lead-acid battery to be detected.
According to the battery detection circuit, the alternating current constant current driving module is arranged to provide the same alternating current constant current source for the battery to be detected and the fixed value resistor, then alternating current voltages at two ends of the battery to be detected and two ends of the fixed value resistor are collected, direct current components of the battery to be detected are filtered, alternating current impedance of the battery is accurately obtained, and accurate detection of performance of the battery can be achieved.
In order to enable the ac constant current driving module to output a constant current better, in one embodiment, referring to fig. 2, the ac constant current driving module 100 includes: the power amplifier U1, the triode Q1, the triode Q2, the current-limiting resistor R2 and the signal follower U2, the input end of the power amplifier U1 is used for connecting the power supply, the output end of the power amplifier U1 is respectively connected with the base of the triode Q1 and the base of the triode Q2, the collector of the triode Q1 is used for connecting the first power supply, the emitter of the triode Q1 is connected with the emitter of the triode Q2, the collector of the triode Q2 is used for connecting the second power supply, the emitter of the triode Q1 is connected with the first end of the current-limiting resistor R2, the second end of the current-limiting resistor R2 is used for connecting the positive pole of the battery 110 to be tested, the second end of the current-limiting resistor R2 is also connected with the positive input end of the signal follower U2, the inverting input end and the output end of the signal follower U2 are connected with the input end of the power amplifier U1, the first end of the constant resistor R1 is used for being connected with the negative electrode of the battery 110 to be tested, and the second end of the constant resistor R1 is used for being grounded. In one embodiment, the power amplifier U1 has a model LM1875, and the signal follower U2 has a model OP07, specifically, the triode Q1 and the triode Q2 form a power pair tube, the power amplifier has the characteristic of small output distortion degree, the alternating current of the power supply is processed by the power amplifier U1, the triode Q1 and the triode Q2, can output constant alternating current, the effective value of the constant alternating current is determined by the ratio of the voltage of the power supply and the current limiting resistor R2, the signal follower U2 can effectively reduce the output impedance, improve the input impedance, further reduce the signal distortion, the distortion of the constant alternating current output by the alternating current constant current driving module is further reduced, so that the constant alternating current can be better output by the alternating current constant current driving module, the distortion of output signals is reduced, and the constant alternating current is provided for the series circuit of the battery to be tested and the constant resistor.
In order to avoid the interference of the dc interference signal with the measurement of the ac impedance of the battery, in one embodiment, please refer to fig. 2 again, the ac constant current driving module further includes a capacitor C1, and the second end of the current limiting resistor R2 is connected to the positive electrode of the battery 110 to be tested through the capacitor C1. Specifically, the capacitor has the function of alternating current resistance and direct current resistance, and the capacitor C1 is connected in series between the output end of the alternating current constant current driving module and the positive electrode of the battery to be tested, so that filtering of direct current clutter interference signals output by the alternating current constant current driving module can be avoided, interference of the direct current interference signals on measurement of alternating current impedance of the battery can be avoided, and meanwhile, interference of the battery to the alternating current constant current driving module caused by electric quantity flowing to the alternating current constant current driving module can also be avoided.
In order to better detect the performance of the battery, in one embodiment, referring to fig. 3, the battery detection circuit 10 further includes a frequency synthesis module 120, an input end of the frequency synthesis module 120 is used for connecting the power supply, and an output end of the frequency synthesis module 120 is connected to an input end of the ac constant current driving module 100. Specifically, the frequency synthesis module, that is, a DDS (Direct Digital Synthesizer) module, has the characteristics of low cost, low power consumption, high resolution, fast conversion time, and the like, and it should be understood that the frequency synthesis module is configured to change the frequency of the alternating current to output alternating currents with different frequencies, that is, the frequency synthesis module may change the frequency of the alternating current power supply, output the alternating currents with different frequencies to the alternating current constant current driving module, provide constant alternating currents with different frequencies for the battery, and further obtain the alternating current impedance of the battery at different frequencies, thereby constructing an alternating current impedance spectrum of the battery to better detect the performance of the battery.
In one embodiment, referring to fig. 4 and fig. 5, the frequency synthesis module 120 includes a digital synthesizer U7 and an operational amplifier U8, an input terminal of the digital synthesizer U7 is connected to the power supply, an output terminal of the digital synthesizer U7 is connected to an inverting input terminal of the operational amplifier U8, a non-inverting input terminal of the operational amplifier U8 is connected to ground, and an output terminal of the operational amplifier U8 is connected to an input terminal of the ac constant current driving module 100. In one embodiment, the digital synthesizer is of the type AD7008AP20, and the operational amplifier is of the type OP 07. By arranging the frequency synthesis module, the digital synthesizer can generate a current signal with corresponding frequency according to the control command and output the current signal as an alternating voltage signal through the operational amplifier.
In one embodiment, the battery performance detecting module further includes a control module, the control module is connected to the control end of the frequency synthesizing module, and the control module is configured to output a control signal, so that the frequency synthesizing module outputs alternating currents with different frequencies. Specifically, the control module is connected to a control end of the digital synthesizer. Through setting up control module to acquire the alternating current of different frequencies better.
In order to further improve the accuracy of the ac impedance detection of the battery, in one embodiment, please refer to fig. 3, the battery detection circuit 10 further includes a first signal amplification module 410 and a second signal amplification module 420, an input end of the first signal amplification module 410 is used for being connected to a voltage collecting point of the battery 110 to be detected through the first dc blocking capacitor module 210, an output end of the first signal amplification module 410 is connected to an input end of the first voltage collecting module 310, an input end of the second signal amplification module 420 is connected to a voltage collecting point of the constant resistor R1 through the second dc blocking capacitor module 220, and an output end of the second signal amplification module 420 is connected to the second voltage collecting module 320. It should be understood that the ac impedance of the battery is relatively small, and the ac current input to the battery cannot be too large, so that the voltage at the two ends of the battery is relatively small, generally reaches millivolt level, when the voltage at the two ends of the battery is collected, a measuring instrument with high precision needs to be used, and the measuring cost is high.
Specifically, after the first signal amplification module and the second signal amplification module are arranged, the alternating current impedance Z of the batterybThe expression of (a) is:
wherein Z isbIs the measured battery impedance modulus; u shapebIs the effective value U of the alternating voltage on the two sides of the battery obtained by measurementrThe effective value of the alternating voltage at two sides of the constant value resistor is obtained by measurement; k is the adjustment coefficient of the system; gbIs the voltage amplification, g, of the cell impedance measurement looprIs the voltage amplification factor of the constant value resistance measurement loop.
In one embodiment, referring to fig. 5 and fig. 6a, the first signal amplifying module 410 includes a first signal amplifier U3 and a resistor R3, a positive phase input terminal of the first signal amplifier U3 is connected to the positive electrode of the battery 110 to be tested through the first dc blocking capacitor module 210, a negative phase input terminal of the first signal amplifier U3 is connected to the negative electrode of the battery 110 to be tested through the first dc blocking capacitor module 210, an external resistor terminal of the first signal amplifier U3 is connected to the resistor R3, and an output terminal of the first signal amplifier U3 is connected to the first voltage collecting module.
Specifically, the amplification factor of the first signal amplifier is represented by an external resistor R3, and the expression of the amplification factor K of the first signal amplifier is:
wherein R is3Is the resistance of resistor R3.
In one embodiment, referring to fig. 5 and fig. 6b, the second signal amplifying module 420 includes a second signal amplifier U4 and a resistor R4, a non-inverting input terminal of the second signal amplifier U4 is connected to a first terminal of the fixed resistor R1 through the second dc blocking capacitor module 220, an inverting input terminal of the second signal amplifier U4 is connected to a second terminal of the fixed resistor R1 through the second dc blocking capacitor module 220, an external resistor terminal of the second signal amplifier U4 is connected to the resistor R4, and an output terminal of the second signal amplifier U4 is connected to the second voltage collecting module.
The calculation of the amplification factor of the second signal amplifier is the same as that of the first signal amplifier, and is not described again in this embodiment.
In order to enable the first voltage collecting module to accurately collect the ac voltage across the battery, in one embodiment, referring to fig. 5 and fig. 6a, the first dc blocking capacitor module 210 includes a capacitor C2 and a capacitor C3, a non-inverting input terminal of the first signal amplifying module 410 is configured to be connected to the positive electrode of the battery under test 110 through the capacitor C2, and an inverting input terminal of the first signal amplifying module 410 is configured to be connected to the negative electrode of the battery under test 110 through the capacitor C3. Specifically, the capacitor has the characteristic of direct current resistance alternating current, can isolate direct current signals in a series circuit, and can filter a direct current interference power supply by arranging the capacitor C2 and the capacitor C3, so that the first voltage acquisition module accurately acquires alternating current voltages at two ends of the battery.
In order to enable the second voltage collecting module to accurately collect the ac voltage across the constant value resistor R1, in one embodiment, referring to fig. 5 and fig. 6b, the second dc blocking capacitor module 220 includes a capacitor C4 and a capacitor C5, the non-inverting input terminal of the second signal amplifying module 420 is connected to the first terminal of the constant value resistor R1 through the capacitor C4, and the inverting input terminal of the second signal amplifying module 420 is connected to the second terminal of the constant value resistor R1 through the capacitor C5. Specifically, the electric capacity has the characteristics of leading to direct current resistance and exchanging, can be completely cut off the direct current signal among the series circuit, through setting up electric capacity C4 and electric capacity C5, can be with the filtering of direct current interference power supply to make the accurate alternating voltage who gathers definite value resistance R1 both ends of second voltage acquisition module.
In order to further improve the accuracy of the ac impedance measurement of the battery, in one embodiment, please refer to fig. 3, the battery detection circuit 10 further includes a first filtering module 510 and a second filtering module 520, an output end of the first signal amplifying module 410 is connected to an input end of the first filtering module 510, and an output end of the first filtering module 510 is connected to the first voltage collecting module 310. In one embodiment, the first filtering module is a first low-pass filtering module, and specifically, the low-pass filtering is a filtering method that the low-frequency signal can normally pass through, and the high-frequency signal exceeding a predetermined threshold is blocked and attenuated. But the magnitude of the blocking and attenuation will vary depending on the frequency and filtering procedure (purpose). It should be understood that the signal amplification module may generate a high-frequency interference signal for signal amplification, and in order to avoid the high-frequency interference signal from affecting the ac impedance measurement of the battery, the first filtering module is provided to filter the high-frequency interference signal, so as to further improve the accuracy of the ac impedance measurement of the battery.
In one embodiment, referring to fig. 6a and 7b, the first filtering module 510 includes a resistor R5, a capacitor C6 and a first operational amplifier U5, the output terminal of the first signal amplifying module 410 is connected to the non-inverting input terminal of the first operational amplifier U5 through the resistor R5, the non-inverting input terminal of the first operational amplifier U5 is further configured to be grounded through the capacitor C6, the inverting input terminal of the first operational amplifier U5 is connected to the output terminal of the first operational amplifier U5, and the output terminal of the first operational amplifier U5 is connected to the first voltage collecting module 310. By arranging the low-pass filtering module, the high-frequency interference signals output by the first signal amplifying module can be filtered out, so that the accuracy of the measurement of the alternating current impedance of the battery is further improved.
In one embodiment, referring to fig. 3, the battery detection circuit further includes a second filtering module 520, an output end of the second signal amplifying module 420 is connected to an input end of the second filtering module 520, and an output end of the second filtering module 520 is connected to the second voltage collecting module 320. The second filtering module is a second low-pass filtering module, specifically, the low-pass filtering is a filtering manner, and the rule is that low-frequency signals can normally pass through, and high-frequency signals exceeding a set critical value are blocked and weakened. But the magnitude of the blocking and attenuation will vary depending on the frequency and filtering procedure (purpose). It should be understood that the signal amplification module may generate a high-frequency interference signal for signal amplification, and in order to avoid the high-frequency interference signal from affecting the ac impedance measurement of the battery, the second filtering module is provided to filter the high-frequency interference signal generated by the second signal amplification module, so as to further improve the accuracy of the ac impedance measurement of the battery.
In one embodiment, referring to fig. 6b and fig. 7b, the second filtering module includes a resistor R6, a capacitor C7 and a second operational amplifier U6, the output terminal of the second signal amplifying module 420 is connected to the non-inverting input terminal of the second operational amplifier U6 through the resistor R6, the non-inverting input terminal of the second operational amplifier U6 is further configured to be grounded through the capacitor C7, the inverting input terminal of the second operational amplifier U6 is connected to the output terminal of the second operational amplifier U6, and the output terminal of the second operational amplifier U6 is connected to the second voltage collecting module 320. By arranging the low-pass filtering module, the high-frequency interference signals output by the second signal amplifying module can be filtered out, so that the accuracy of the measurement of the alternating current impedance of the battery is further improved.
In one embodiment, the first voltage acquisition module and the second voltage acquisition module are both analog-to-digital converters. Specifically, the analog-to-digital converter is an a/D converter, and the analog-to-digital converter is a converter that converts an analog quantity after comparison with a standard quantity (or a reference quantity) into a discrete signal represented by a binary number, that is, can convert an analog voltage into a digital voltage, so that the voltage across the battery to be tested and the voltage across the fixed-value resistor R1 can be better collected by the analog-to-digital converter.
In one embodiment, the analog-to-digital converter has a model number of: MAX197AMY1, the specific circuit principle of which is shown in fig. 8.
In the following, referring to fig. 4 to 8, a specific embodiment is provided, in which an input terminal of the digital synthesizer U7 is used for connecting the power supply, an output terminal of the digital synthesizer U7 is connected to an inverting input terminal of the operational amplifier U8, a non-inverting input terminal of the operational amplifier U8 is used for grounding, an output terminal of the operational amplifier U8 is connected to an input terminal of a power amplifier U1, an output terminal of the power amplifier U1 is respectively connected to a base of the transistor Q1 and a base of the transistor Q2, a collector of the transistor Q1 is used for connecting a first power supply, an emitter of the transistor Q1 is connected to an emitter of the transistor Q2, a collector of the transistor Q2 is used for connecting a second power supply, an emitter of the transistor Q1 is connected to a first end of the current limiting resistor R2, a second end of the current limiting resistor R2 is used for connecting to a positive electrode of the battery under test 110 through the capacitor C1, the second end of the current-limiting resistor R2 is further connected to the positive input end of the signal follower U2, the inverting input end and the output end of the signal follower U2 are connected to the input end of the power amplifier U1, the positive input end of the first signal amplifier U3 is used to be connected to the positive electrode of the battery under test 110 through the capacitor C2, the inverting input end of the first signal amplifier U3 is used to be connected to the negative electrode of the battery under test 110 through the capacitor C3, the external resistor end of the first signal amplifier U3 is connected to the resistor R3, the output end of the first signal amplifier U3 is connected to the positive input end of the first operational amplifier U5 through the resistor R5, the positive input end of the first operational amplifier U5 is further used to be grounded through the capacitor C6, the inverting input end of the first operational amplifier U5 is connected to the output end of the first operational amplifier U5, the output end of the first operational amplifier U5 is connected with the first voltage acquisition module, the non-inverting input end of the second signal amplifier U4 is connected with the first end of the constant value resistor R1 through the capacitor C4, the inverting input terminal of the second signal amplifier U4 is connected to the second terminal of the constant value resistor R1 through the capacitor C5, the external resistor terminal of the second signal amplifier U4 is connected to the resistor R4, the output terminal of the second signal amplifier U4 is connected to the non-inverting input terminal of the second operational amplifier U6 via the resistor R6, the non-inverting input of the second operational amplifier U6 is also used to connect to ground through the capacitor C7, the inverting input end of the second operational amplifier U6 is connected with the output end of the second operational amplifier U6, and the output end of the second operational amplifier U6 is connected with the second voltage acquisition module.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A battery detection circuit, comprising: the constant current driving circuit comprises an alternating current constant current driving module, a constant value resistor R1, a first blocking capacitor module, a second blocking capacitor module, a first voltage acquisition module and a second voltage acquisition module;
the input end of the alternating current constant current driving module is used for being connected with a power supply, the output end of the alternating current constant current driving module is used for being connected with the anode of a battery to be tested, the first end of the fixed value resistor R1 is used for being connected with the cathode of the battery to be tested, the second end of the fixed value resistor R1 is used for being grounded, the first voltage acquisition module is used for being connected with the two ends of the battery to be tested through the first blocking capacitor module, and the second voltage acquisition module is connected with the two ends of the fixed value resistor R1 through the second blocking capacitor module.
2. The battery detection circuit according to claim 1, wherein the ac constant current driving module includes: a power amplifier U1, a triode Q1, a triode Q2, a current-limiting resistor R2 and a signal follower U2, the input end of the power amplifier U1 is used for connecting the power supply, the output end of the power amplifier U1 is respectively connected with the base electrode of the triode Q1 and the base electrode of the triode Q2, the collector of the transistor Q1 is used for connecting a first power supply, the emitter of the transistor Q1 is connected with the emitter of the transistor Q2, the collector of the triode Q2 is used for connecting a second power supply, the emitter of the triode Q1 is connected with the first end of the current limiting resistor R2, the second end of the current limiting resistor R2 is used for being connected with the anode of the battery to be tested, the second end of the current limiting resistor R2 is also connected with the non-inverting input end of the signal follower U2, the inverting input and output of the signal follower U2 are connected to the input of the power amplifier U1.
3. The battery detection circuit according to claim 2, wherein the ac constant current driving module further includes a capacitor C1, and the second terminal of the current limiting resistor R2 is connected to the positive electrode of the battery to be tested through the capacitor C1.
4. The battery detection circuit according to claim 1, further comprising a frequency synthesis module, wherein an input end of the frequency synthesis module is used for connecting the power supply, and an output end of the frequency synthesis module is connected with an input end of the alternating current constant current driving module.
5. The battery detection circuit according to claim 1, further comprising a first signal amplification module and a second signal amplification module, wherein an input end of the first signal amplification module is used for being connected to two ends of the battery to be detected through the first dc blocking capacitor module, an output end of the first signal amplification module is connected to an input end of the first voltage acquisition module, an input end of the second signal amplification module is connected to two ends of the fixed resistor R1 through the second dc blocking capacitor module, and an output end of the second signal amplification module is connected to the second voltage acquisition module.
6. The battery detection circuit according to claim 5, wherein the first blocking capacitor module comprises a capacitor C2 and a capacitor C3, a positive input terminal of the first signal amplification module is configured to be connected to the positive terminal of the battery under test through the capacitor C2, and a negative input terminal of the first signal amplification module is configured to be connected to the negative terminal of the battery under test through the capacitor C3.
7. The battery detection circuit of claim 5, wherein the second blocking capacitor module comprises a capacitor C4 and a capacitor C5, a positive input terminal of the second signal amplification module is connected to the first terminal of the constant resistor R1 through the capacitor C4, and a negative input terminal of the second signal amplification module is connected to the second terminal of the constant resistor R1 through the capacitor C5.
8. The battery detection circuit of claim 5, further comprising a first filtering module and a second filtering module, wherein an output terminal of the first signal amplifying module is connected to an input terminal of the first filtering module, and an output terminal of the first filtering module is connected to the first voltage collecting module.
9. The battery detection circuit according to claim 5, further comprising a second filtering module, wherein an output terminal of the second signal amplifying module is connected to an input terminal of the second filtering module, and an output terminal of the second filtering module is connected to the second voltage collecting module.
10. The battery detection circuit of claim 1, wherein the first voltage acquisition module and the second voltage acquisition module are both analog-to-digital converters.
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| CN110441704A (en) * | 2019-07-23 | 2019-11-12 | 广州供电局有限公司 | Battery detection circuit |
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| CN110441704A (en) * | 2019-07-23 | 2019-11-12 | 广州供电局有限公司 | Battery detection circuit |
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