CN109444759A - A kind of accumulator internal resistance measuring system - Google Patents
A kind of accumulator internal resistance measuring system Download PDFInfo
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- CN109444759A CN109444759A CN201811575035.2A CN201811575035A CN109444759A CN 109444759 A CN109444759 A CN 109444759A CN 201811575035 A CN201811575035 A CN 201811575035A CN 109444759 A CN109444759 A CN 109444759A
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Abstract
The present invention relates to parameters of electric power detection technique fields, and in particular to a kind of accumulator internal resistance measuring system, including constant-current source, sine-wave oscillator, first order amplifier, second level amplifier, third level amplifier, lock-in amplifier and gear control circuit；After the sine-wave oscillator generates sinusoidal signal, exports after operational amplifier amplifies, connect all the way with the constant-current source, is connect all the way with the lock-in amplifier；Lock-in amplifier after filtering, is transmitted to AD sample circuit and measures to DC level.This programme does not need to discharge to battery, and measurement accuracy is high, and the on-line checking internal resistance of cell may be implemented, harmless to battery.
Description
Technical field
The present invention relates to parameters of electric power detection technique field, in particular to a kind of accumulator internal resistance measuring system.
Background technique
Battery is the most common backup power supply of DC operation power supply system.DC operation power supply system is in electric system
The important loads uninterruption power source such as protective relaying device, signal device.If in the state of accident, battery cannot discharge
The electricity of respective volume out, it will further expansion accident range.Accumulator internal resistance is that one of measurement accumulator property is important
Technical parameter, it is however generally that, battery capacity is bigger, and internal resistance is smaller.It therefore is generally acknowledged storage by the measurement to accumulator internal resistance
One of effective scheme of battery capacity assessment.Traditional direct-current discharge method by battery transient large current discharge, then measures
The voltage at battery both ends calculates internal resistance by Ohm's law, but instantaneous high-current discharge causes to hurt to battery itself
Evil influences service performance and the service life of battery, and needs battery group to be in off-line state when measurement；Simple EIS method is neglected
The presence of direct current system median generatrix and feed cable distribution capacity is omited, and distribution capacity is with DC operation power supply system
Capacity and scene characteristics of power supply and change, distribution capacity believes the excitation of injection during the measurement of simple EIS method
It number is shunted, so that the precision of measurement is had a greatly reduced quality, then, how to precisely measure out accumulator internal resistance, realize to storage
Battery is accurately assessed, and not damaging to battery itself is the current producer's needs for producing DC operation power supply system
Urgently solve the problems, such as.
Summary of the invention
Goal of the invention of the invention is: in order to solution must not on same instrument to the measurement of multiple functions the problem of,
A kind of radio frequency front-end unit for radio comprehensive measurement instrument is provided.
To achieve the goals above, the technical solution adopted by the present invention are as follows:
A kind of accumulator internal resistance measuring system, which is characterized in that including constant-current source, sine-wave oscillator, first order amplification
Device, second level amplifier, third level amplifier, lock-in amplifier and gear control circuit；The sine-wave oscillator generates just
It after string signal, exports after operational amplifier amplifies, is connect all the way with the constant-current source, connected all the way with the lock-in amplifier
It connects；
Output transmitting terminal BAT+, BAT- of the constant-current source is connected by conducting wire, the Europe resistance for simulated battery internal resistance
As load；
Receiving end S+, S- of the first order amplifier are connected on the load resistance of simulated battery internal resistance by conducting wire,
Wherein the receiving end S+ of the first order amplifier is connect with the output transmitting terminal BAT+ of the constant-current source, the first order amplification
The receiving end S- of device is connect with the output transmitting terminal BAT- of the constant-current source, will be transmitted to described the after sinusoidal signal amplification
Two-stage amplifier；
The second level amplifier will after sinusoidal signal amplification, output to wave detector, the wave detector by it is described just
String signal is rectified into DC level；If the load resistance of the simulated battery internal resistance is less than its threshold value, pass through the gear control
The third level amplifier is added in circuit processed, switching, if the load resistance of the simulated battery internal resistance is greater than its threshold value, passes through
The DC level is then input to the lock-in amplifier by the gear control circuit；
The lock-in amplifier after filtering, is transmitted to AD sample circuit and measures to the DC level.
It preferably, further include DC-DC power source circuit, the DC-DC power source circuit exports six groups of power supplys after conversion, point
It Wei not+5V, 3.3V, ± 15V, ± 28V.
Preferably, the constant-current source includes first resistor, second resistance, the first low-pass filter amplifier, the second low pass filtered
Twt amplifier, third low-pass filter amplifier, first crystal triode, the second transistor, third transistor；It is described
First resistor, the second resistance, first low-pass filter amplifier constitute the constant-current source reference level input circuit, institute
State first resistor, the passing point of the second resistance is constant-current source reference level input point；Wherein the second resistance is variable
Resistance；Second low-pass filter amplifier, the first crystal triode, second transistor, the third are brilliant
Body triode constitutes the detection circuit of the constant-current source reference level input signal.
Preferably, the sine-wave oscillator includes the 4th low-pass filter amplifier, the 5th low-pass filter amplifier；It is described
The output end of 4th low-pass filter amplifier is connect with the input terminal of the 5th low-pass filter amplifier.
Preferably, the lock-in amplifier is made of AD630；Including the first input pin, the second input pin and defeated
Pin out；First input pin is connect with the output end of the third level amplifier, for inputting measured signal；Described
Two input pins are connect with the sine-wave oscillator, for reference signal needed for inputting the lock-in amplifier；It is described defeated
Pin is connect with the AD sample circuit out.
Preferably, first input pin and the signal phase of second input pin input are 180 °.
It preferably, further include control device, the control device is single-chip microcontroller；The gear control circuit and the AD are adopted
Sample circuit is connect with the single-chip microcontroller respectively.
Preferably, the single-chip microcontroller includes the first serial peripheral interface, the second serial peripheral interface；Described first is serial outer
Interface is enclosed to connect with the memory；Second serial peripheral interface is connect with the network adapter.
It preferably, further include network transformer, the network transformer is connect with the network adapter.
Preferably, the amplification factor of the first order amplifier is 50, and the amplification factor of the second level amplifier is 10,
The amplification factor of the third level amplifier is 10.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are: this programme is not needed to electric power storage
Pond is discharged, and measurement accuracy is high, and the on-line checking internal resistance of cell may be implemented, harmless to battery.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of accumulator internal resistance measuring system；
Fig. 2~Fig. 7 is respectively the power circuit diagram of+5V, 3.3V ,+15V ,+28V, -15V and -28V；
Fig. 8 is 1K sine-wave oscillator output circuit figure；
Fig. 9 is 100ma constant-current source reference input circuit diagram；
Figure 10 is measuring and amplifying circuit diagram；
Figure 11 detector circuit figure；
Figure 12 is lock-in amplifier circuit diagram；
Figure 13 is control device circuit connection diagram；
Figure 14 is control device catenation principle figure.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in detail.
Embodiment 1
A kind of accumulator internal resistance measuring system, as shown in Figure 1, including constant-current source, sine-wave oscillator, first order amplification
Device, second level amplifier, third level amplifier, lock-in amplifier and gear control circuit；Sine-wave oscillator generates sinusoidal letter
After number, exports after operational amplifier amplifies, connect all the way with constant-current source, is connect all the way with lock-in amplifier.
Output transmitting terminal BAT+, BAT- of constant-current source is connected by conducting wire, the Europe resistance conduct for simulated battery internal resistance
Load.
Receiving end S+, S- of first order amplifier are connected on the load resistance of simulated battery internal resistance by conducting wire, wherein
The output transmitting terminal BAT+ connection of the receiving end S+ and constant-current source of first order amplifier, the receiving end S- and perseverance of first order amplifier
The output transmitting terminal BAT- connection in stream source, is transmitted to second level amplifier after sinusoidal signal is amplified.
After second level amplifier amplifies sinusoidal signal, export to wave detector, sinusoidal signal is rectified into direct current by wave detector
Level；If the load resistance of simulated battery internal resistance is less than its threshold value, by gear control circuit, third level amplification is added in switching
Device by the gear control circuit, then inputs DC level if the load resistance of simulated battery internal resistance is greater than its threshold value
To lock-in amplifier.
Lock-in amplifier after filtering, is transmitted to AD sample circuit and measures to DC level.
It further include DC-DC power source circuit, DC-DC power source circuit inputs 10-12V power supply, six groups of power supplys are exported by conversion,
Respectively+5V, 3.3V, ± 15V, ± 28V, as shown in Fig. 2-Fig. 7, wherein Fig. 2 is the power circuit of+5V, and U17 is model
The switching regulator of TPS54328DDAR, Fig. 3 are the power circuit of 3.3V, and U18 is the switch voltage-stabilizing of model TPS54328DDAR
Device, Fig. 4 are the power circuit of+15V, and U19 is the boost converter of model LM27313XMF, and Fig. 5 is the power circuit of+28V,
U20 is the boost converter of model LM27313XMF, and Fig. 6 is the power circuit of -15V, and U21 is that the decompression of model LM5575HM is steady
Depressor, Fig. 7 are the power circuit of -28V, and U22 is the voltage-releasing voltage stabilizer of model LM5575HM.
As shown in figure 8, being the sine-wave oscillator output circuit of 1kHz frequency, sine-wave oscillator includes the 4th low pass filtered
Twt amplifier U1, the 5th low-pass filter amplifier U2；The output end of 4th low-pass filter amplifier U1 is put with the 5th low-pass filtering
The input terminal U2 connection of big device.4th low-pass filter amplifier U1 output pin 6, fiduciary level virtual value 3V or so.
As shown in figure 9, being 100ma constant-current source reference input circuit diagram, constant-current source includes first resistor R42, second resistance
R44, the first low-pass filter amplifier U5, the second low-pass filter amplifier U4, third low-pass filter amplifier U3, first crystal three
Pole pipe Q1, the second transistor Q2, third transistor Q10；First resistor R42, second resistance R44, the first low pass filtered
Twt amplifier U5 constitute constant-current source reference level input circuit, first resistor R42, second resistance R44 passing point be constant-current source
Reference level input point；Wherein second resistance R4 is variable resistance；Second low-pass filter amplifier U4, first crystal triode
Q1, the second transistor Q2, third transistor Q10 constitute the generation circuit of constant-current source.
R37 input terminal is constant-current source reference input 100mV virtual value, tests the pin 6 of third low-pass filter amplifier U3,
Fiduciary level is 100mV virtual value.As the pin 6 of third low-pass filter amplifier U3 exports abnormal, detection C13 input letter
Number, whether normal the first crystal triode Q1 that overdrived, third transistor Q10 circuit detect input signal.
It as shown in Figure 10, is measuring and amplifying circuit, first order amplifier U6, second level amplifier U8, third level amplifier
U10 is model AD8221AR, the output transmitting terminal BAT+ connection of the receiving end S+ and constant-current source of first order amplifier U6, the first order
The output transmitting terminal BAT- connection of the receiving end S- and constant-current source of amplifier U6.
The amplification factor A=50 or so of first order amplifier U6.Amplifier exports test point is exported in operational amplifier U6
Pin 7 is held, observes dead-beat waveform with oscillograph.This grade of amplification factor can exist according to the requirement of shift voltage and load resistance
50 or so are finely adjusted.
The amplification factor A=10 of second level amplifier U8.Amplifier exports test point is drawn in operational amplifier U8 output end
Foot 7 observes dead-beat waveform with oscillograph.
Detector circuit as shown in figure 11, second level amplifier U8 output pin 7 export sinusoidal signal be sent to by
The wave detector that operational amplifier U16 is constituted is rectified into DC level.U15A/U15B is the differential comparison of two-way of model LM2903D
Device.
When load is less than 1m Ω, the 6 foot voltages of wave detector rectifier output voltage less-than operation amplifier U15B, this time control
1, the 2 feet conducting of device control analog switch U9A processed, 3,5 feet of analog switch U9B disconnect, and third level amplifier is added in switching
U10.When load is greater than 1m Ω, wave detector rectifier output voltage is greater than the 6 foot voltages of operational amplifier U15B, at this time control dress
3, the 5 feet conducting of control analog switch U9B is set, 1,2 feet of analog switch U9A disconnect, and cancel third level amplification.
The 13 foot CTR13 of analog switch U9A are connect with control device in Figure 10.
The amplification factor A=10 of third level amplifier U10.Amplifier exports test point is in operational amplifier U10 output end
Pin 7 observes dead-beat waveform with oscillograph.
It as shown in figure 12, is lock-in amplifier circuit diagram, lock-in amplifier U13's is made of AD630, model
AD630AR, including the first input pin 1, the second input pin 9 and output pin 13；First input pin 1 amplifies with the third level
The output end of device U10 connects, and for inputting measured signal, measured signal is the AC constant-current source of injecting accumulator internal resistance in electric power storage
Sampled signal in the internal resistance of pond is input to the pin after three-level is put；Second input pin 2 is connect with sine-wave oscillator,
For reference signal needed for inputting lock-in amplifier；Output pin 13 is connect with AD sample circuit.First input pin 1 and
The signal phase of two input pins 9 input is 180 °
It as shown in figure 13, further include control device, control device is single-chip microcontroller D12A, model STM32F205RGT6V,
CTR6 is connected with the 38 foot PC7 of single-chip microcontroller D12A in gear control circuit, and CTR13 is connected with the 39 foot PC8 of single-chip microcontroller D12A.AD
Sample circuit is also connect with single-chip microcontroller respectively.
As shown in Figure 13 and Figure 14, single-chip microcontroller D12A includes the first serial peripheral interface 1, the second serial peripheral interface
SPI3；First serial peripheral interface 1 is connect with memory D13；Second serial peripheral interface 3 connects with network adapter
It connects.And communicated by RS232, it is connect with the port I/O, carries out the transmission of signal.
It further include network transformer, network transformer is connect with network adapter.
SCM peripheral interface has mainly used SPI, RS232, LAN mouthfuls etc., wherein the model of memory D13
24LC256I/SM is written and read by SPI interface, and capacity is the EEPROM of 256KB, and single-chip microcontroller can store calibration data
In memory, single-chip microcontroller controls it read-write by SPI1 interface.
Single-chip microcontroller realizes network communication by SPI3 Interface Controller network interface adapter W5500, and W5500 is a more function
The monolithic network interface chip of energy, has been internally integrated 10/100M ethernet controller, has been mainly used in highly integrated, high stable, height
In the embedded system of performance and low cost.The output termination network transformer of W5500 matches to export network communication.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of accumulator internal resistance measuring system, which is characterized in that including constant-current source, sine-wave oscillator, first order amplifier,
Second level amplifier, third level amplifier, lock-in amplifier and gear control circuit；The sine-wave oscillator generates sinusoidal letter
It after number, exports after operational amplifier amplifies, is connect all the way with the constant-current source, is connect all the way with the lock-in amplifier；
Output transmitting terminal BAT+, BAT- of the constant-current source is connected by conducting wire, the Europe resistance conduct for simulated battery internal resistance
Load；
Receiving end S+, S- of the first order amplifier are connected on the load resistance of simulated battery internal resistance by conducting wire, wherein
The receiving end S+ of the first order amplifier is connect with the output transmitting terminal BAT+ of the constant-current source, the first order amplifier
Receiving end S- is connect with the output transmitting terminal BAT- of the constant-current source, will be transmitted to the second level after sinusoidal signal amplification
Amplifier；
After the second level amplifier amplifies the sinusoidal signal, output to wave detector, the wave detector believes the sine
Number it is rectified into DC level；If the load resistance of the simulated battery internal resistance is less than its threshold value, pass through gear control electricity
The third level amplifier is added in road, switching, if the load resistance of the simulated battery internal resistance is greater than its threshold value, by described
The DC level is then input to the lock-in amplifier by gear control circuit；
The lock-in amplifier after filtering, is transmitted to AD sample circuit and measures to the DC level.
2. a kind of accumulator internal resistance measuring system according to claim 1, which is characterized in that further include DC-DC power source electricity
Road, the DC-DC power source circuit export six groups of power supplys, respectively+5V, 3.3V, ± 15V, ± 28V after conversion.
3. a kind of accumulator internal resistance measuring system according to claim 1, which is characterized in that the constant-current source includes first
Resistance, second resistance, the first low-pass filter amplifier, the second low-pass filter amplifier, third low-pass filter amplifier, the first crystalline substance
Body triode, the second transistor, third transistor；The first resistor, the second resistance, first low pass
Filter amplifier constitutes the constant-current source reference level input circuit, the first resistor, the second resistance passing point be
Constant-current source reference level input point；Wherein the second resistance is variable resistance；Second low-pass filter amplifier, described
One transistor, second transistor, the third transistor constitute the constant-current source reference level input
The detection circuit of signal.
4. a kind of accumulator internal resistance measuring system according to claim 1, which is characterized in that the sine-wave oscillator packet
Include the 4th low-pass filter amplifier, the 5th low-pass filter amplifier；The output end of 4th low-pass filter amplifier with it is described
The input terminal of 5th low-pass filter amplifier connects.
5. a kind of accumulator internal resistance measuring system according to claim 1, which is characterized in that the lock-in amplifier by
AD630 is constituted；Including the first input pin, the second input pin and output pin；First input pin and the third
The output end connection of grade amplifier, for inputting measured signal；Second input pin is connect with the sine-wave oscillator,
For reference signal needed for inputting the lock-in amplifier；The output pin is connect with the AD sample circuit.
6. a kind of accumulator internal resistance measuring system according to claim 5, which is characterized in that first input pin with
The signal phase of the second input pin input is 180 °.
7. a kind of accumulator internal resistance measuring system according to claim 1, which is characterized in that it further include control device, institute
Stating control device is single-chip microcontroller；The gear control circuit and the AD sample circuit are connect with the single-chip microcontroller respectively.
8. a kind of accumulator internal resistance measuring system according to claim 7, which is characterized in that the single-chip microcontroller includes first
Serial peripheral interface, the second serial peripheral interface；First serial peripheral interface is connect with the memory；Second string
Row peripheral interface is connect with the network adapter.
9. a kind of accumulator internal resistance measuring system according to claim 8, which is characterized in that it further include network transformer,
The network transformer is connect with the network adapter.
10. a kind of accumulator internal resistance measuring system according to claim 1, which is characterized in that the first order amplifier
Amplification factor be 50, the amplification factor of the second level amplifier is 10, and the amplification factor of the third level amplifier is 10.
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| CN110471002A (en) * | 2019-08-27 | 2019-11-19 | 深圳市新威尔电子有限公司 | Improve the method and high-precision internal resistance detection equipment of internal resistance instrument precision |
| CN110579719A (en) * | 2019-10-14 | 2019-12-17 | 中研天成(天津)能源科技有限公司 | Storage battery impedance measuring device |
| CN113125836A (en) * | 2021-04-15 | 2021-07-16 | 青岛汉泰智能科技有限公司 | Current probe |
| CN113406516A (en) * | 2021-07-16 | 2021-09-17 | 山东泰开自动化有限公司 | Storage battery internal resistance on-line monitoring device based on low-current pulse discharge method |
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