CN109444759B - Storage battery internal resistance measurement system - Google Patents
Storage battery internal resistance measurement system Download PDFInfo
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- CN109444759B CN109444759B CN201811575035.2A CN201811575035A CN109444759B CN 109444759 B CN109444759 B CN 109444759B CN 201811575035 A CN201811575035 A CN 201811575035A CN 109444759 B CN109444759 B CN 109444759B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to the technical field of electric power parameter detection, in particular to a storage battery internal resistance measurement system, which comprises a constant current source, a sine wave oscillator, a first-stage amplifier, a second-stage amplifier, a third-stage amplifier, a phase-locked amplifier and a gear control circuit, wherein the constant current source is connected with the sine wave oscillator; after generating a sine signal, the sine wave oscillator outputs the sine signal after being amplified by an operational amplifier, wherein one path of the sine wave oscillator is connected with the constant current source, and the other path of the sine wave oscillator is connected with the phase-locked amplifier; the phase-locked amplifier filters the direct current level and transmits the direct current level to the AD sampling circuit for measurement. The scheme does not need to discharge the storage battery, has high measurement accuracy, can realize on-line detection of the internal resistance of the battery, and has no damage to the battery.
Description
Technical Field
The invention relates to the technical field of electric power parameter detection, in particular to a storage battery internal resistance measurement system.
Background
The battery is the most commonly used backup power source for dc operated power systems. The direct current operation power supply system is an uninterruptible power supply of important loads such as a relay protection device, a signal device and the like in the power system. If the storage battery can not release the electric quantity with corresponding capacity in the accident state, the accident range can be further enlarged. The internal resistance of a battery is an important technical parameter for measuring the performance of the battery, and in general, the larger the battery capacity is, the smaller the internal resistance is. And therefore measurement of internal resistance of a battery is one of the accepted effective schemes for battery capacity assessment. In the traditional direct current discharge method, the storage battery is instantaneously discharged with large current, then the voltage at two ends of the storage battery is measured, and the internal resistance is calculated through ohm law, but the instantaneous large current discharge causes damage to the storage battery, influences the service performance and service life of the battery, and the storage battery pack is required to be in an offline state during measurement; the simple EIS method ignores the existence of bus and feed cable distributed capacitance in the direct current system, the distributed capacitance is changed along with the capacity of the direct current operation power supply system and the on-site power supply characteristic, the injected excitation signal is shunted by the distributed capacitance in the measuring process of the simple EIS method, so that the measuring precision is greatly discounted, therefore, the internal resistance of the storage battery is accurately measured, the accurate assessment of the storage battery is realized, and the damage to the storage battery is avoided, which is a problem that manufacturers for producing the direct current operation power supply system need to solve urgently.
Disclosure of Invention
The invention aims at: in order to solve the problem that the measurement of multiple functions cannot be performed on the same instrument, a radio frequency front-end unit for a radio integrated tester is provided.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The storage battery internal resistance measurement system is characterized by comprising a constant current source, a sine wave oscillator, a first-stage amplifier, a second-stage amplifier, a third-stage amplifier, a phase-locked amplifier and a gear control circuit; after generating a sine signal, the sine wave oscillator outputs the sine signal after being amplified by an operational amplifier, wherein one path of the sine wave oscillator is connected with the constant current source, and the other path of the sine wave oscillator is connected with the phase-locked amplifier;
The output transmitting ends BAT+ and BAT-of the constant current source are connected through wires and used for simulating the European resistance of the internal resistance of the battery as a load;
The receiving end S+ and S-of the first-stage amplifier are connected to a load resistor simulating the internal resistance of the battery through a wire, wherein the receiving end S+ of the first-stage amplifier is connected with the output transmitting end BAT+ of the constant current source, the receiving end S-of the first-stage amplifier is connected with the output transmitting end BAT-of the constant current source, and the sinusoidal signal is amplified and then transmitted to the second-stage amplifier;
The second-stage amplifier amplifies the sinusoidal signal and outputs the sinusoidal signal to a detector, and the detector rectifies the sinusoidal signal into a direct current level; if the load resistance of the simulated battery internal resistance is smaller than the threshold value, switching and adding the load resistance of the simulated battery internal resistance into the third-stage amplifier through the gear control circuit, and if the load resistance of the simulated battery internal resistance is larger than the threshold value, inputting the direct current level into the lock-in amplifier through the gear control circuit;
And the phase-locked amplifier filters the direct-current level and transmits the direct-current level to the AD sampling circuit for measurement.
Preferably, the power supply circuit further comprises a DC-DC power supply circuit, and the DC-DC power supply circuit outputs six groups of power supplies after conversion, wherein the power supplies are respectively +5V, 3.3V, 15V and 28V.
Preferably, the constant current source comprises a first resistor, a second resistor, a first low-pass filter amplifier, a second low-pass filter amplifier, a third low-pass filter amplifier, a first transistor, a second transistor and a third transistor; the first resistor, the second resistor and the first low-pass filter amplifier form the constant current source reference level input circuit, and the meeting point of the first resistor and the second resistor is a constant current source reference level input point; wherein the second resistor is a variable resistor; the second low-pass filter amplifier, the first transistor, the second transistor and the third transistor form a detection circuit of the constant current source reference level input signal.
Preferably, the sine wave oscillator comprises a fourth low-pass filter amplifier and a fifth low-pass filter amplifier; the output end of the fourth low-pass filter amplifier is connected with the input end of the fifth low-pass filter amplifier.
Preferably, the lock-in amplifier is composed of an AD 630; the circuit comprises a first input pin, a second input pin and an output pin; the first input pin is connected with the output end of the third-stage amplifier and is used for inputting a tested signal; the second input pin is connected with the sine wave oscillator and is used for inputting a reference signal required by the phase-locked amplifier; the output pin is connected with the AD sampling circuit.
Preferably, the phase of the signal input by the first input pin and the second input pin is 180 °.
Preferably, the device also comprises a control device, wherein the control device is a singlechip; and the gear control circuit and the AD sampling circuit are respectively connected with the singlechip.
Preferably, the single chip microcomputer comprises a first serial peripheral interface and a second serial peripheral interface; the first serial peripheral interface is connected with the memory; the second serial peripheral interface is connected with the network adapter.
Preferably, the network adapter further comprises a network transformer, and the network transformer is connected with the network adapter.
Preferably, the amplification factor of the first stage amplifier is 50, the amplification factor of the second stage amplifier is 10, and the amplification factor of the third stage amplifier is 10.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows: the scheme does not need to discharge the storage battery, has high measurement accuracy, can realize on-line detection of the internal resistance of the battery, and has no damage to the battery.
Drawings
Fig. 1 is a schematic diagram of a battery internal resistance measurement system;
FIGS. 2-7 are power circuit diagrams of +5V, 3.3V, +15V, +28V, -15V, and-28V, respectively;
FIG. 8 is a diagram of a 1K sine wave oscillator output circuit;
Fig. 9 is a circuit diagram of a 100ma constant current source reference input;
FIG. 10 is a measurement amplifying circuit diagram;
FIG. 11 is a circuit diagram of a detector;
FIG. 12 is a circuit diagram of a lock-in amplifier;
FIG. 13 is a circuit diagram of a control device;
fig. 14 is a schematic diagram of the control device connection.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Example 1
The internal resistance measuring system of the storage battery, as shown in figure 1, comprises a constant current source, a sine wave oscillator, a first-stage amplifier, a second-stage amplifier, a third-stage amplifier, a phase-locked amplifier and a gear control circuit; after generating a sine signal, the sine wave oscillator outputs the sine signal after being amplified by the operational amplifier, one path of the sine wave oscillator is connected with the constant current source, and the other path of the sine wave oscillator is connected with the phase-locked amplifier.
The output transmitting ends BAT+ and BAT-of the constant current source are connected through wires and used for simulating the European resistance of the internal resistance of the battery as a load.
The receiving end S+ and S-of the first-stage amplifier are connected to a load resistor simulating the internal resistance of the battery through a wire, wherein the receiving end S+ of the first-stage amplifier is connected with the output transmitting end BAT+ of the constant current source, the receiving end S-of the first-stage amplifier is connected with the output transmitting end BAT-of the constant current source, and the sinusoidal signal is amplified and then transmitted to the second-stage amplifier.
The second-stage amplifier amplifies the sine signal and outputs the sine signal to the detector, and the detector rectifies the sine signal into a direct current level; and if the load resistance of the simulated battery internal resistance is smaller than the threshold value, switching and adding the load resistance of the simulated battery internal resistance into the third-stage amplifier through the gear control circuit, and if the load resistance of the simulated battery internal resistance is larger than the threshold value, inputting the direct current level into the lock-in amplifier through the gear control circuit.
The phase-locked amplifier filters the direct current level and transmits the direct current level to the AD sampling circuit for measurement.
The DC-DC power supply circuit inputs 10-12V power supply, six groups of power supplies are output after conversion, namely +5V, 3.3V, +/-15V and+/-28V are respectively shown in figures 2-7, wherein the power supply circuit is +5V in figure 2, the switching regulator is of model TPS54328DDAR in U17, the power supply circuit is 3.3V in figure 3, the switching regulator is of model TPS54328DDAR in U18, the power supply circuit is +15V in figure 4, the boost converter is of model LM27313XMF in U19, the power supply circuit is +28V in figure 5, the boost converter is of model LM27313XMF in U20, the power supply circuit is of-15V in figure 6, the buck regulator is of model LM5575HM in U21, the power supply circuit is of-28V in figure 7, and the buck regulator is of model LM5575HM in U22.
As shown in fig. 8, the sine wave oscillator output circuit with the frequency of 1kHz comprises a fourth low-pass filter amplifier U1 and a fifth low-pass filter amplifier U2; the output of the fourth low-pass filter amplifier U1 is connected to the input U2 of the fifth low-pass filter amplifier. And the output end pin 6 of the fourth low-pass filter amplifier U1 has a standard level effective value of about 3V.
As shown in fig. 9, a 100ma constant current source reference input circuit diagram is shown, and the constant current source comprises a first resistor R42, a second resistor R44, a first low-pass filter amplifier U5, a second low-pass filter amplifier U4, a third low-pass filter amplifier U3, a first transistor Q1, a second transistor Q2, and a third transistor Q10; the first resistor R42, the second resistor R44 and the first low-pass filter amplifier U5 form a constant current source reference level input circuit, and the meeting point of the first resistor R42 and the second resistor R44 is a constant current source reference level input point; wherein the second resistor R4 is a variable resistor; the second low-pass filter amplifier U4, the first transistor Q1, the second transistor Q2 and the third transistor Q10 form a generating circuit of a constant current source.
The input end of R37 is a constant current source reference input 100mV effective value, and the standard level is 100mV effective value of the pin 6 of the third low-pass filter amplifier U3 is tested. If the output of the pin 6 of the third low-pass filter amplifier U3 is abnormal, the C13 input signal is detected, and whether the input signal is normal is detected by driving the circuits of the first transistor Q1 and the third transistor Q10.
As shown in fig. 10, for the measurement amplifying circuit, the first stage amplifier U6, the second stage amplifier U8, and the third stage amplifier U10 are of the model AD8221AR, where the receiving end s+ of the first stage amplifier U6 is connected to the output transmitting end bat+ of the constant current source, and the receiving end S-of the first stage amplifier U6 is connected to the output transmitting end BAT-of the constant current source.
The amplification factor a=50 of the first stage amplifier U6. The output test point of the amplifier is arranged at the pin 7 of the output end of the operational amplifier U6, and the oscillograph is used for observing the waveform without oscillation. The amplification factor of the stage can be finely adjusted at about 50 according to the requirements of shift voltage and load resistance.
The amplification factor a=10 of the second stage amplifier U8. The output test point of the amplifier is arranged at the pin 7 of the output end of the operational amplifier U8, and the oscillograph is used for observing the waveform without oscillation.
In the detector circuit shown in fig. 11, the sinusoidal signal output from the output terminal pin 7 of the second stage amplifier U8 is sent to the detector formed by the operational amplifier U16 to be rectified to a dc level. U15A/U15B is a double-way differential comparator of model LM 2903D.
When the load is smaller than 1mΩ, the rectified output voltage of the detector is smaller than the voltage of 6 pins of the operational amplifier U15B, at this time, the control device controls the 1 pin and the 2 pin of the analog switch U9A to be conducted, and the 3 pin and the 5 pin of the analog switch U9B to be disconnected, so that the third-stage amplifier U10 is switched and added. When the load is larger than 1mΩ, the rectified output voltage of the detector is larger than the voltage of 6 pins of the operational amplifier U15B, at the moment, the control device controls the 3 pin and the 5 pin of the analog switch U9B to be conducted, the 1 pin and the 2 pin of the analog switch U9A to be disconnected, and the third-stage amplification is canceled.
In fig. 10, pin 13 of analog switch U9A is connected to the control device.
The amplification a=10 of the third stage amplifier U10. The output test point of the amplifier is arranged at the pin 7 of the output end of the operational amplifier U10, and the oscillograph is used for observing the waveform without oscillation.
As shown in fig. 12, a circuit diagram of a phase-locked amplifier is shown, the phase-locked amplifier U13 is formed by an AD630, and the model is AD630AR, and includes a first input pin 1, a second input pin 9 and an output pin 13; the first input pin 1 is connected with the output end of the third-stage amplifier U10 and is used for inputting a tested signal, wherein the tested signal is a sampling signal of an alternating current constant current source injected into the internal resistance of the storage battery on the internal resistance of the storage battery, and the tested signal is input to the pin after three-stage amplification; the second input pin 2 is connected with the sine wave oscillator and is used for inputting a reference signal required by the lock-in amplifier; the output pin 13 is connected to an AD sampling circuit. The phase of the signals input by the first input pin 1 and the second input pin 9 is 180 DEG
As shown in FIG. 13, the automatic transmission further comprises a control device, wherein the control device is a singlechip D12A, the model is STM32F205RGT6V, CTR6 in the gear control circuit is connected with a 38-pin PC7 of the singlechip D12A, and CTR13 is connected with a 39-pin PC8 of the singlechip D12A. The AD sampling circuits are respectively connected with the single chip microcomputer.
As shown in fig. 13 and 14, the single chip microcomputer D12A includes a first serial peripheral interface SPI1, a second serial peripheral interface SPI3; the first serial peripheral interface SPI1 is connected with the memory D13; the second serial peripheral interface SPI3 is connected to the network adapter. And the signal transmission is carried out by communicating with the I/O port through RS 232.
The system also comprises a network transformer, and the network transformer is connected with the network adapter.
The peripheral interface of the singlechip mainly uses SPI, RS232, LAN ports and the like, wherein the model of a memory D13 is 24LC256I/SM, the EEPROM with the capacity of 256KB is read and written through the SPI interface, the singlechip can store calibration data in the memory, and the singlechip controls the read and write of the calibration data through the SPI1 interface.
The singlechip controls the network interface adapter W5500 through SPI3 interface to realize network communication, W5500 is a multifunctional monolithic network interface chip, and a 10/100M Ethernet controller is integrated inside, and is mainly applied to an embedded system with high integration, high stability, high performance and low cost. The output of W5500 is terminated with a network transformer to match the network communication output.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The storage battery internal resistance measurement system is characterized by comprising a constant current source, a sine wave oscillator, a first-stage amplifier, a second-stage amplifier, a third-stage amplifier, a phase-locked amplifier and a gear control circuit; after generating a sine signal, the sine wave oscillator outputs the sine signal after being amplified by an operational amplifier, wherein one path of the sine wave oscillator is connected with the constant current source, and the other path of the sine wave oscillator is connected with the phase-locked amplifier;
The output transmitting ends BAT+ and BAT-of the constant current source are connected through wires and used for simulating the European resistance of the internal resistance of the battery as a load;
The receiving end S+ and S-of the first-stage amplifier are connected to a load resistor simulating the internal resistance of the battery through a wire, wherein the receiving end S+ of the first-stage amplifier is connected with the output transmitting end BAT+ of the constant current source, the receiving end S-of the first-stage amplifier is connected with the output transmitting end BAT-of the constant current source, and the sinusoidal signal is amplified and then transmitted to the second-stage amplifier;
The second-stage amplifier amplifies the sinusoidal signal and outputs the sinusoidal signal to a detector, and the detector rectifies the sinusoidal signal into a direct current level; if the load resistance of the simulated battery internal resistance is smaller than the threshold value, switching and adding the load resistance of the simulated battery internal resistance into the third-stage amplifier through the gear control circuit, and if the load resistance of the simulated battery internal resistance is larger than the threshold value, inputting the direct current level into the lock-in amplifier through the gear control circuit;
the phase-locked amplifier filters the direct-current level and transmits the direct-current level to an AD sampling circuit for measurement;
The circuit in the detector comprises an operational amplifier U16, a comparator U15A, a comparator U15B, a transistor Q4 and a transistor Q5, wherein the negative input end of the comparator U15A is connected with the negative input end of the comparator U15B in parallel and then is connected with the output end of the operational amplifier U16, the comparator U15A outputs a signal to the base electrode of the transistor Q4, the comparator U15B outputs a signal to the base electrode of the transistor Q5, and the collector electrode of the transistor Q4 and the collector electrode of the transistor Q5 serve as the output of the detector;
when the load is smaller than 1mΩ, the output voltage of the output end of the operational amplifier U16 is smaller than the positive input end voltage of the comparator U15B, at this time, the control device controls the analog switch U9A to be turned on, the analog switch U9B to be turned off, and the third-stage amplifier is switched and added; when the load is larger than 1mΩ, the output voltage of the output end of the operational amplifier U16 is larger than the positive input end voltage of the comparator U15B, and at this time, the control device controls the analog switch U9B to be turned on, and the analog switch U9A to be turned off, thereby canceling the third-stage amplifier.
2. The system for measuring internal resistance of a storage battery according to claim 1, further comprising a DC-DC power supply circuit, wherein the DC-DC power supply circuit outputs six groups of power supplies of +5v, 3.3V, ±15v and ±28v after conversion.
3. The system according to claim 1, wherein the constant current source comprises a first resistor, a second resistor, a first low-pass filter amplifier, a second low-pass filter amplifier, a third low-pass filter amplifier, a first transistor, a second transistor, and a third transistor; the first resistor, the second resistor and the first low-pass filter amplifier form the constant current source reference level input circuit, and the meeting point of the first resistor and the second resistor is a constant current source reference level input point; wherein the second resistor is a variable resistor; the second low-pass filter amplifier, the first transistor, the second transistor and the third transistor form a detection circuit of the constant current source reference level input signal.
4. The battery internal resistance measurement system according to claim 1, wherein the sine wave oscillator includes a fourth low-pass filter amplifier, a fifth low-pass filter amplifier; the output end of the fourth low-pass filter amplifier is connected with the input end of the fifth low-pass filter amplifier.
5. The internal resistance measurement system for a battery according to claim 1, wherein the lock-in amplifier is constituted by an AD 630; the circuit comprises a first input pin, a second input pin and an output pin; the first input pin is connected with the output end of the third-stage amplifier and is used for inputting a tested signal; the second input pin is connected with the sine wave oscillator and is used for inputting a reference signal required by the phase-locked amplifier; the output pin is connected with the AD sampling circuit.
6. The battery internal resistance measurement system according to claim 5, wherein the signal phase inputted from the first input pin and the second input pin is 180 °.
7. The system for measuring the internal resistance of a storage battery according to claim 1, further comprising a control device, wherein the control device is a single-chip microcomputer; and the gear control circuit and the AD sampling circuit are respectively connected with the singlechip.
8. The battery internal resistance measurement system according to claim 7, wherein the single-chip microcomputer comprises a first serial peripheral interface and a second serial peripheral interface; the first serial peripheral interface is connected with the memory; the second serial peripheral interface is connected with a network adapter.
9. The battery internal resistance measurement system according to claim 8, further comprising a network transformer connected to the network adapter.
10. The internal resistance measurement system for a battery according to claim 1, wherein the amplification factor of the first-stage amplifier is 50, the amplification factor of the second-stage amplifier is 10, and the amplification factor of the third-stage amplifier is 10.
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| CN108802711A (en) * | 2018-04-10 | 2018-11-13 | 深圳市镭神智能系统有限公司 | A kind of signal receiving device and method, laser radar |
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