CN111257777B - Internal resistance detection device with offset magnetic flux - Google Patents
Internal resistance detection device with offset magnetic flux Download PDFInfo
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- CN111257777B CN111257777B CN202010176823.5A CN202010176823A CN111257777B CN 111257777 B CN111257777 B CN 111257777B CN 202010176823 A CN202010176823 A CN 202010176823A CN 111257777 B CN111257777 B CN 111257777B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
Abstract
The invention provides internal resistance detection equipment with a magnetic flux offset function, which comprises a preamplifier module, an amplifier module, a band-pass filter module, a follower module, a same-phase amplifier module, an inverse-phase amplifier module, a first analog switch module, a second analog switch module, a low-pass filter module, a direct-current amplifier module, an AD converter module, an optical coupling isolation module, an MCU module, a four-order low-pass filter module, an adjustable gain amplifier module, a voltage-current conversion module and a current source module, and has the beneficial effects that: the invention has strong anti-interference capability, high speed and good stability, thereby eliminating the interference caused by electromagnetic induction on detection, effectively improving the detection precision of the internal resistance value of the battery, improving the working efficiency of an industrial production line and reducing the labor cost.
Description
[ technical field ] A
The invention relates to the field of internal resistance detection equipment, in particular to internal resistance detection equipment with a function of offsetting magnetic flux.
[ background of the invention ]
With the development of battery technology, the performance of batteries is also more and more powerful. The internal resistance or impedance of the battery is an important parameter influencing the performance of the battery, and the currently used side internal resistance method is mainly a four-wire method. However, when the internal resistance of the battery is measured by using the four-wire method, because the detection loop forms a certain area, when alternating current is conducted to the current lead, an alternating magnetic field is generated, so that the magnetic flux in the loop of the voltage detection line is changed, and induced voltage is generated, therefore, the measured voltage is actually the sum of the voltages at two ends of the battery and the induced voltage on the voltage detection line, and a certain error exists in the detection result of the internal resistance of the battery.
In practical use, the area of the voltage detection line loop is random, the frequency of the induced voltage is consistent with the frequency of the current source, and the interference voltage cannot be filtered through frequency-selecting filtering.
[ summary of the invention ]
The invention aims to solve the problems that in actual use, the area of a voltage detection line loop is random, the frequency of induced voltage is consistent with the frequency of a current source, and interference voltage cannot be filtered through frequency-selecting filtering, and the interference of the induced voltage can cause the defect of larger error of a detection result due to very small numerical value of battery internal resistance, so that the novel internal resistance detection equipment with the offset magnetic flux is provided.
The invention is realized by the following technical scheme:
an internal resistance detection device with magnetic flux offset function comprises a preamplifier module, an amplifier module, a band-pass filter module, a follower module, an in-phase amplifier module, an inverting amplifier module, a first analog switch module, a second analog switch module, a low-pass filter module, a direct current amplifier module, an AD converter module, an optical coupling isolation module, an MCU module, a four-order low-pass filter module, an adjustable gain amplifier module, a voltage-current conversion module and a current source module, wherein the preamplifier module is connected with the amplifier module, the amplifier module is connected with the band-pass filter module, the band-pass filter module is connected with the follower module, the follower module is respectively connected with the in-phase amplifier module and the inverting amplifier module, the in-phase amplifier module is respectively connected with the first analog switch module, the second analog switch module, and the second switch module, the third analog switch module, the amplifier module, the third analog switch module, the fourth analog switch module, the fourth switch module, the, The first analog switch module and the second analog switch module are respectively connected with the low-pass filter module, the low-pass filter module is connected with the direct current amplifier module, the direct current amplifier module is connected with the AD converter module, the AD converter module is connected with the MCU module through the optical coupling isolation module, and the first analog switch module and the second analog switch module are respectively connected with the MCU module through the optical coupling isolation module;
the MCU module outputs four paths of phase-adjustable same-frequency signals, and the four paths of phase-adjustable same-frequency signals are connected with a fourth-order low-pass filter module through an optical coupling isolation module, the fourth-order low-pass filter module is connected with the voltage-current conversion module, the fourth-order low-pass filter module is connected with the adjustable gain amplifier module, the voltage-current conversion module is connected with the current source, and the adjustable gain amplifier module is connected with the voltage-current conversion module.
Furthermore, one of the signals with adjustable phase and same frequency output by the MCU module and generated magnetic flux signals are mutually offset.
Further, the preamplifier module comprises a capacitor, a resistor R58, a resistor R62, a resistor R59, a triode, an operational amplifier, and a resistor R63, wherein one end of each of a plurality of capacitors is respectively connected with one end of the resistor R58 and one end of the resistor R62, the other end of each of the plurality of capacitors is connected with a reference ground, the other end of the resistor R58 is connected with one end of the capacitor C47, the other end of the resistor R62 is connected with one end of the capacitor C47, one end of the capacitor C47 is connected with the negative input end of the operational amplifier, the other end of the capacitor C47 is connected with the output end of the operational amplifier, the other end of the resistor R58 is connected with one end of the resistor R59, the other end of the resistor R59 is connected with the other end of the capacitor C47, the collector of the triode is connected with the negative input end of the operational amplifier, and the base of the triode is connected with the emitter of the triode, the emitter of the triode is connected with the positive input end of the operational amplifier, one end of the resistor R63 is connected with the output end of the operational amplifier, the other end of the resistor R63 is connected with one end of the capacitor C54, the other end of the capacitor C54 is connected with a reference ground, the positive voltage input end of the operational amplifier is connected with one ends of the capacitor C44 and the capacitor C45, the other ends of the capacitor C44 and the capacitor C45 are respectively connected with the reference ground, the negative voltage input end of the operational amplifier is connected with one ends of the capacitor C55 and the capacitor C57, and the other ends of the capacitor C55 and the capacitor C57 are respectively connected with the reference ground.
Further, the amplifier module includes a resistor R60, a resistor R61, an operational amplifier, a capacitor, and a resistor R64, one end of the resistor R60 is connected to one end of the resistor R61, the other end of the resistor R60 is connected to a reference ground, the other end of the resistor R61 is connected to the output end of the operational amplifier, the negative input end of the operational amplifier is connected to the resistor R60 and the resistor R61, one end of the capacitor is connected to the positive input end of the operational amplifier, one end of the resistor R64 is connected to the positive input end of the operational amplifier, and the other end of the resistor R64 is connected to the reference ground.
Further, the fourth-order low-pass filter module includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a first operational amplifier, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a second operational amplifier, and a capacitor, one end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R1 is connected to a reference ground, the other end of the resistor R2 is connected to an output end of the first operational amplifier, a negative input end of the first operational amplifier is connected to the resistor R1 and the resistor R2, a positive input end of the first operational amplifier is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistor R5, one end of the capacitor C7 is connected to the positive input end of the first operational amplifier, the other end of the capacitor C7 is connected to the reference ground, and an output end of the first operational amplifier is connected to one end of the capacitor C6, the other end of the capacitor C6 is connected to one end of the resistor R6, the positive voltage end of the first operational amplifier is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the ground, the negative voltage end of the first operational amplifier is connected to one end of the capacitor C8, the other end of the capacitor C8 is connected to the ground, one end of the capacitor C3 is connected to one end of the resistor R5, and the other end of the capacitor C3 is connected to the ground;
one end of the resistor R3 is connected to one end of the resistor R4, the other end of the resistor R3 is connected to a reference ground, the other end of the resistor R4 is connected to the output end of the second operational amplifier, the output end of the second operational amplifier is connected to the other end of the resistor R5, the negative input end of the second operational amplifier is connected to the resistors R3 and R4, the positive input end of the second operational amplifier is connected to one end of the resistor R8, one end of the resistor R9 is connected to the positive input end of the second operational amplifier, the other end of the resistor R9 is connected to a reference ground, one end of the capacitor C2 is connected to the positive input end of the second operational amplifier, the other end of the capacitor C2 is connected to one end of the resistor R8, one end of the capacitor C5 is connected to one end of the capacitor C2, the other end of the capacitor C5 is connected to a reference ground, and the other end of the resistor R8 is connected to one end of the resistor R7, one end of the capacitor C4 is connected between the resistor R7 and the resistor R8, and the other end of the capacitor C4 is connected to the ground reference.
Further, the low-pass filter module includes a resistor R31, a resistor R32, an operational amplifier, and a capacitor, one end of the resistor R31 is connected to one end of the resistor R32, the other end of the resistor R31 is connected to the analog switch module, the other end of the resistor R32 is connected to the positive input end of the operational amplifier, the negative input end of the operational amplifier is connected to the output end of the operational amplifier, one end of the capacitor C28 is connected to the positive input end of the operational amplifier, the other end of the capacitor C28 is connected to the ground, one end of the capacitor C27 is connected to the output end of the operational amplifier, and the other end of the capacitor C27 is connected between the resistor R31 and the resistor R32.
Further, the filter module includes a first operational amplifier, a resistor R34, a resistor R40, a capacitor, a resistor R39, a resistor R36, a second operational amplifier, a resistor R33, a resistor R38, a resistor R37, and a resistor R35, a positive input end of the first operational amplifier is connected to one end of the resistor R40, the other end of the resistor R40 is connected to a reference ground, a negative input end of the first operational amplifier is connected to one end of the resistor R34, the other end of the resistor R34 is connected to the capacitor C31, one end of the capacitor C31 is connected to an output end of the first operational amplifier, the other end of the capacitor C31 is connected to one end of the capacitor C33, the other end of the capacitor C33 is connected to a negative input end of the first operational amplifier, one end of the resistor R36 is connected to one end of the capacitor C33, one end of the resistor R39 is connected to one end of the resistor R36, and the other end of the resistor R39 is connected to the reference ground, the other end of the resistor R36 is connected to the output end of the second operational amplifier, the positive input end of the second operational amplifier is connected to one end of the resistor R38, the other end of the resistor R38 is connected to the reference ground, one end of the capacitor C32 is connected to the negative input end of the second operational amplifier, the other end of the capacitor C32 is connected to one end of the resistor R35, one end of the resistor R33 is connected to the negative input end of the second operational amplifier, the other end of the resistor R33 is connected to one end of the capacitor C30, one end of the capacitor C30 is connected to the output end of the second operational amplifier, the other end of the capacitor C30 is connected to the other end of the capacitor C32, one end of the resistor R37 is connected to one end of the resistor R35, the other end of the resistor R37 is connected to the reference ground, and the positive voltage input end of the second operational amplifier is connected to one end of the capacitor C29, the other end of the capacitor C29 is connected with the reference ground, the negative voltage input end of the second operational amplifier is connected with one end of the capacitor C34, and the other end of the capacitor C34 is connected with the reference ground.
Further, the adjustable gain amplifier module includes a resistor R50, a resistor RV1, a resistor R51, an operational amplifier, a resistor R52, and a capacitor, where one end of the resistor R50 is connected to one end of the resistor RV1, the other end of the resistor R50 is connected to a reference ground, the other end of the resistor RV1 is connected to one end of the resistor R51, the other end of the resistor R51 is connected to an output end of the operational amplifier, a negative input end of the operational amplifier is connected to one end of the resistor R51, the capacitor C38 is connected to the resistor R51 in parallel, a positive input end of the operational amplifier is connected to a VIN end, the resistor R52 is connected to the resistor RV1 in parallel, a fourth pin of the resistor R52 is connected to one end of the capacitor C42, the other end of the capacitor C42 is connected to a reference ground, and a fifth pin of the resistor R52 is connected to the reference ground.
The invention has the beneficial effects that: the invention has strong anti-interference capability, high speed and good stability, thereby eliminating the interference caused by electromagnetic induction on detection, effectively improving the detection precision of the internal resistance value of the battery, improving the working efficiency of an industrial production line and reducing the labor cost.
[ description of the drawings ]
FIG. 1 is a schematic diagram of the internal resistance detection device with magnetic flux cancellation according to the present invention;
FIG. 2 is a circuit schematic of a preamplifier module according to the invention;
FIG. 3 is a circuit schematic of an amplifier module according to the present invention;
FIG. 4 is a schematic circuit diagram of a band pass filter module according to the present invention;
FIG. 5 is a schematic circuit diagram of the non-inverting amplifier module, the low pass filter module, and the analog switch module according to the present invention;
FIG. 6 is a schematic circuit diagram of a fourth-order low-pass filter module according to the present invention;
FIG. 7 is a schematic circuit diagram of a voltage-to-current conversion module according to the present invention;
FIG. 8 is a schematic circuit diagram of an adjustable gain amplifier module according to the present invention;
reference numerals: 1. a preamplifier module; 2. an amplifier module; 3. a band pass filter module; 4. a follower module; 5. a non-inverting amplifier module; 6. an inverting amplifier module; 7. a first analog switch module; 8. a second analog switch module; 9. a low pass filter module; 10. a DC amplifier module; 11. an AD converter module; 12. an opto-coupler isolation module; 13. an MCU module; 14. a fourth order low pass filter module; 15. an adjustable gain amplifier module; 16. a voltage-current conversion module; 17. and the current source module.
[ detailed description ] embodiments
The invention is further described with reference to the accompanying drawings and the detailed description:
as shown in fig. 1, 2, 3, 4, 5, 6, 7, 8, an internal resistance detection device with offset magnetic flux comprises a preamplifier module 1, an amplifier module 2, a band-pass filter module 3, a follower module 4, a non-inverting amplifier module 5, an inverting amplifier module 6, a first analog switch module 7, a second analog switch module 8, a low-pass filter module 9, a dc amplifier module 10, an AD converter module 11, a light coupling isolation module 12, an MCU module 13, a fourth-order low-pass filter module 14, an adjustable gain amplifier module 15, a voltage-current conversion module 16, a current source module 17, wherein the preamplifier module 1 is connected with the amplifier module 2, the amplifier module 2 is connected with the band-pass filter module 3, and the band-pass filter module 3 is connected with the follower module 4, the follower module 4 is respectively connected with the non-inverting amplifier module 5 and the inverting amplifier module 6, the non-inverting amplifier module 5 is respectively connected with the first analog switch module 7 and the second analog switch module 8, the inverting amplifier module 6 is respectively connected with the first analog switch module 7 and the second analog switch module 8, the first analog switch module 7 and the second analog switch module 8 are respectively connected with the low-pass filter module 9, the low pass filter module 9 is connected to the dc amplifier module 10, the dc amplifier module 9 is connected to the AD converter module 11, the AD converter module 11 is connected with the MCU module 13 through the optical coupling isolation module 12, the first analog switch module 7 and the second analog switch module 8 are respectively connected with the MCU module 13 through an optical coupling isolation module 12;
the MCU module 13 outputs four paths of phase-adjustable co-frequency signals, and the four paths of phase-adjustable co-frequency signals are connected to a fourth-order low-pass filter module 14 through an optical coupling isolation module 12, the fourth-order low-pass filter module 14 is connected to a voltage-current conversion module 16, the fourth-order low-pass filter module 14 is connected to an adjustable gain amplifier module 15, the voltage-current conversion module 16 is connected to a current source 17, and the adjustable gain amplifier module 15 is connected to the voltage-current conversion module 16.
Preferably, one of the signals with adjustable phase and same frequency output by the MCU module 13 and the generated magnetic flux signal cancel each other out.
Preferably, the preamplifier module 1 includes a capacitor, a resistor R58, a resistor R62, a resistor R59, a transistor, an operational amplifier, and a resistor R63, one end of each of a plurality of capacitors is respectively connected to one end of the resistor R58 and one end of the resistor R62, the other end of each of the plurality of capacitors is connected to a reference ground, the other end of the resistor R58 is connected to one end of the capacitor C47, the other end of the resistor R62 is connected to one end of the capacitor C47, one end of the capacitor C47 is connected to the negative input end of the operational amplifier, the other end of the capacitor C47 is connected to the output end of the operational amplifier, the other end of the resistor R58 is connected to one end of the resistor R59, the other end of the resistor R59 is connected to the other end of the capacitor C47, the collector of the transistor is connected to the negative input end of the operational amplifier, and the base of the transistor is connected to the emitter of the transistor, the emitter of the triode is connected with the positive input end of the operational amplifier, one end of the resistor R63 is connected with the output end of the operational amplifier, the other end of the resistor R63 is connected with one end of the capacitor C54, the other end of the capacitor C54 is connected with a reference ground, the positive voltage input end of the operational amplifier is connected with one ends of the capacitor C44 and the capacitor C45, the other ends of the capacitor C44 and the capacitor C45 are respectively connected with the reference ground, the negative voltage input end of the operational amplifier is connected with one ends of the capacitor C55 and the capacitor C57, and the other ends of the capacitor C55 and the capacitor C57 are respectively connected with the reference ground.
Preferably, the amplifier module 2 includes a resistor R60, a resistor R61, an operational amplifier, a capacitor, and a resistor R64, one end of the resistor R60 is connected to one end of the resistor R61, the other end of the resistor R60 is connected to a reference ground, the other end of the resistor R61 is connected to the output end of the operational amplifier, the negative input end of the operational amplifier is connected to the resistor R60 and the resistor R61, one end of the capacitor is connected to the positive input end of the operational amplifier, one end of the resistor R64 is connected to the positive input end of the operational amplifier, and the other end of the resistor R64 is connected to the reference ground.
Preferably, the fourth-order low-pass filter module 14 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a first operational amplifier, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a second operational amplifier, and a capacitor, one end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R1 is connected to a ground reference, the other end of the resistor R2 is connected to the first operational amplifier output end, the first operational amplifier negative input end is connected to the resistor R1 and the resistor R2, the first operational amplifier positive input end is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistor R5, one end of the capacitor C7 is connected to the first operational amplifier positive input end, the other end of the capacitor C7 is connected to a ground reference, the first operational amplifier output end is connected to one end of the capacitor C6, the other end of the capacitor C6 is connected to one end of the resistor R6, the positive voltage end of the first operational amplifier is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the ground, the negative voltage end of the first operational amplifier is connected to one end of the capacitor C8, the other end of the capacitor C8 is connected to the ground, one end of the capacitor C3 is connected to one end of the resistor R5, and the other end of the capacitor C3 is connected to the ground;
one end of the resistor R3 is connected to one end of the resistor R4, the other end of the resistor R3 is connected to a reference ground, the other end of the resistor R4 is connected to the output end of the second operational amplifier, the output end of the second operational amplifier is connected to the other end of the resistor R5, the negative input end of the second operational amplifier is connected to the resistors R3 and R4, the positive input end of the second operational amplifier is connected to one end of the resistor R8, one end of the resistor R9 is connected to the positive input end of the second operational amplifier, the other end of the resistor R9 is connected to a reference ground, one end of the capacitor C2 is connected to the positive input end of the second operational amplifier, the other end of the capacitor C2 is connected to one end of the resistor R8, one end of the capacitor C5 is connected to one end of the capacitor C2, the other end of the capacitor C5 is connected to a reference ground, and the other end of the resistor R8 is connected to one end of the resistor R7, one end of the capacitor C4 is connected between the resistor R7 and the resistor R8, and the other end of the capacitor C4 is connected to the ground reference.
Preferably, the low pass filter module 9 includes a resistor R31, a resistor R32, an operational amplifier, and a capacitor, wherein one end of the resistor R31 is connected to one end of the resistor R32, the other end of the resistor R31 is connected to the analog switch module, the other end of the resistor R32 is connected to the positive input end of the operational amplifier, the negative input end of the operational amplifier is connected to the output end of the operational amplifier, one end of the capacitor C28 is connected to the positive input end of the operational amplifier, the other end of the capacitor C28 is connected to the ground, one end of the capacitor C27 is connected to the output end of the operational amplifier, and the other end of the capacitor C27 is connected between the resistor R31 and the resistor R32.
Preferably, the band-pass filter module 3 includes a first operational amplifier, a resistor R34, a resistor R40, a capacitor, a resistor R39, a resistor R36, a second operational amplifier, a resistor R33, a resistor R38, a resistor R37, and a resistor R35, a positive input end of the first operational amplifier is connected to one end of the resistor R40, the other end of the resistor R40 is connected to a reference ground, a negative input end of the first operational amplifier is connected to one end of the resistor R34, the other end of the resistor R34 is connected to the capacitor C31, one end of the capacitor C31 is connected to an output end of the first operational amplifier, the other end of the capacitor C31 is connected to one end of the capacitor C33, the other end of the capacitor C33 is connected to a negative input end of the first operational amplifier, one end of the resistor R36 is connected to one end of the capacitor C33, one end of the resistor R39 is connected to one end of the resistor R36, and the other end of the resistor R39 is connected to the reference ground, the other end of the resistor R36 is connected to the output end of the second operational amplifier, the positive input end of the second operational amplifier is connected to one end of the resistor R38, the other end of the resistor R38 is connected to the reference ground, one end of the capacitor C32 is connected to the negative input end of the second operational amplifier, the other end of the capacitor C32 is connected to one end of the resistor R35, one end of the resistor R33 is connected to the negative input end of the second operational amplifier, the other end of the resistor R33 is connected to one end of the capacitor C30, one end of the capacitor C30 is connected to the output end of the second operational amplifier, the other end of the capacitor C30 is connected to the other end of the capacitor C32, one end of the resistor R37 is connected to one end of the resistor R35, the other end of the resistor R37 is connected to the reference ground, and the positive voltage input end of the second operational amplifier is connected to one end of the capacitor C29, the other end of the capacitor C29 is connected with the reference ground, the negative voltage input end of the second operational amplifier is connected with one end of the capacitor C34, and the other end of the capacitor C34 is connected with the reference ground.
Preferably, the adjustable gain amplifier module 15 includes a resistor R50, a resistor RV1, a resistor R51, an operational amplifier, a resistor R52, and a capacitor, where one end of the resistor R50 is connected to one end of the resistor RV1, the other end of the resistor R50 is connected to a reference ground, the other end of the resistor RV1 is connected to one end of the resistor R51, the other end of the resistor R51 is connected to an output end of the operational amplifier, a negative input end of the operational amplifier is connected to one end of the resistor R51, the capacitor C38 is connected to the resistor R51 in parallel, a positive input end of the operational amplifier is connected to a VIN end, the resistor R52 is connected to the resistor RV1 in parallel, a fourth pin of the resistor R52 is connected to one end of the capacitor C42, the other end of the capacitor C42 is connected to a reference ground, and a fifth pin of the resistor R52 is connected to the reference ground.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (7)
1. An internal resistance detection device having a function of canceling out a magnetic flux, characterized in that: the amplifier comprises a preamplifier module, an amplifier module, a band-pass filter module, a follower module, an in-phase amplifier module, an inverting amplifier module, a first analog switch module, a second analog switch module, a low-pass filter module, a direct current amplifier module, an AD converter module, an optical coupling isolation module, an MCU module, a four-order low-pass filter module, an adjustable gain amplifier module, a voltage-current conversion module and a current source module, wherein the preamplifier module is connected with the amplifier module, the amplifier module is connected with the band-pass filter module, the band-pass filter module is connected with the follower module, the follower module is respectively connected with the in-phase amplifier module and the inverting amplifier module, the in-phase amplifier module is respectively connected with the first analog switch module and the second analog switch module, the inverting amplifier module is respectively connected with the first analog switch module and the second analog switch module, the first analog switch module and the second analog switch module are respectively connected with the low-pass filter module, the low-pass filter module is connected with the direct current amplifier module, the direct current amplifier module is connected with the AD converter module, the AD converter module is connected with the MCU module through the optical coupling isolation module, and the first analog switch module and the second analog switch module are respectively connected with the MCU module through the optical coupling isolation module;
the MCU module outputs four paths of phase-adjustable same-frequency signals, and the four paths of phase-adjustable same-frequency signals are connected with a fourth-order low-pass filter module through an optical coupling isolation module, the fourth-order low-pass filter module is connected with the voltage-current conversion module, the fourth-order low-pass filter module is connected with the adjustable gain amplifier module, the voltage-current conversion module is connected with the current source, and the adjustable gain amplifier module is connected with the voltage-current conversion module.
2. The internal resistance detection device with canceling magnetic flux according to claim 1, characterized in that: the preamplifier module comprises a capacitor, a resistor R58, a resistor R62, a resistor R59, a triode, an operational amplifier and a resistor R63, one end of each of a plurality of capacitors is respectively connected with one end of the resistor R58 and one end of the resistor R62, the other end of each of the plurality of capacitors is connected with a reference ground, the other end of the resistor R58 is connected with one end of the capacitor C47, the other end of the resistor R62 is connected with one end of the capacitor C47, one end of the capacitor C47 is connected with the negative input end of the operational amplifier, the other end of the capacitor C47 is connected with the output end of the operational amplifier, the other end of the resistor R58 is connected with one end of the resistor R59, the other end of the resistor R59 is connected with the other end of the capacitor C47, the collector of the triode is connected with the negative input end of the operational amplifier, the base of the triode is connected with the emitter of the triode, and the emitter of the operational amplifier is connected with the positive input end of the operational amplifier, one end of the resistor R63 is connected with the output end of the operational amplifier, the other end of the resistor R63 is connected with one end of the capacitor C54, the other end of the capacitor C54 is connected with a reference ground, the positive voltage input end of the operational amplifier is connected with one ends of the capacitor C44 and the capacitor C45, the other ends of the capacitor C44 and the capacitor C45 are respectively connected with the reference ground, the negative voltage input end of the operational amplifier is connected with one ends of the capacitor C55 and the capacitor C57, and the other ends of the capacitor C55 and the capacitor C57 are respectively connected with the reference ground.
3. The internal resistance detection device with canceling magnetic flux according to claim 1, characterized in that: the amplifier module comprises a resistor R60, a resistor R61, an operational amplifier, a capacitor and a resistor R64, one end of the resistor R60 is connected with one end of the resistor R61, the other end of the resistor R60 is connected with a reference ground, the other end of the resistor R61 is connected with the output end of the operational amplifier, the negative input end of the operational amplifier is connected with the resistor R60 and the resistor R61, one end of the capacitor is connected with the positive input end of the operational amplifier, one end of the resistor R64 is connected with the positive input end of the operational amplifier, and the other end of the resistor R64 is connected with the reference ground.
4. The internal resistance detection device with canceling magnetic flux according to claim 1, characterized in that: the fourth-order low-pass filter module comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a first operational amplifier, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a second operational amplifier and a capacitor, wherein one end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R1 is connected with a reference ground, the other end of the resistor R2 is connected with an output end of the first operational amplifier, a negative input end of the first operational amplifier is connected with the resistor R1 and the resistor R2, a positive input end of the first operational amplifier is connected with one end of the resistor R6, the other end of the resistor R6 is connected with one end of the resistor R5, one end of the capacitor C7 is connected with the positive input end of the first operational amplifier, the other end of the capacitor C7 is connected with the reference ground, and an output end of the first operational amplifier is connected with one end of the capacitor C6, the other end of the capacitor C6 is connected to one end of the resistor R6, the positive voltage end of the first operational amplifier is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the ground, the negative voltage end of the first operational amplifier is connected to one end of the capacitor C8, the other end of the capacitor C8 is connected to the ground, one end of the capacitor C3 is connected to one end of the resistor R5, and the other end of the capacitor C3 is connected to the ground;
one end of the resistor R3 is connected to one end of the resistor R4, the other end of the resistor R3 is connected to a reference ground, the other end of the resistor R4 is connected to the output end of the second operational amplifier, the output end of the second operational amplifier is connected to the other end of the resistor R5, the negative input end of the second operational amplifier is connected to the resistors R3 and R4, the positive input end of the second operational amplifier is connected to one end of the resistor R8, one end of the resistor R9 is connected to the positive input end of the second operational amplifier, the other end of the resistor R9 is connected to a reference ground, one end of the capacitor C2 is connected to the positive input end of the second operational amplifier, the other end of the capacitor C2 is connected to one end of the resistor R8, one end of the capacitor C5 is connected to one end of the capacitor C2, the other end of the capacitor C5 is connected to a reference ground, and the other end of the resistor R8 is connected to one end of the resistor R7, one end of the capacitor C4 is connected between the resistor R7 and the resistor R8, and the other end of the capacitor C4 is connected to the ground reference.
5. The internal resistance detection device with canceling magnetic flux according to claim 1, characterized in that: the low-pass filter module comprises a resistor R31, a resistor R32, an operational amplifier and a capacitor, wherein one end of the resistor R31 is connected with one end of the resistor R32, the other end of the resistor R31 is connected with the analog switch module, the other end of the resistor R32 is connected with the positive input end of the operational amplifier, the negative input end of the operational amplifier is connected with the output end of the operational amplifier, one end of the capacitor C28 is connected with the positive input end of the operational amplifier, the other end of the capacitor C28 is connected with the reference ground, one end of the capacitor C27 is connected with the output end of the operational amplifier, and the other end of the capacitor C27 is connected between a resistor R31 and a resistor R32.
6. The internal resistance detection device with canceling magnetic flux according to claim 1, wherein: the band-pass filter module comprises a first operational amplifier, a resistor R34, a resistor R40, a capacitor, a resistor R39, a resistor R36, a second operational amplifier, a resistor R33, a resistor R38, a resistor R37 and a resistor R35, wherein the positive input end of the first operational amplifier is connected with one end of the resistor R40, the other end of the resistor R40 is connected with a reference ground, the negative input end of the first operational amplifier is connected with one end of the resistor R34, the other end of the resistor R34 is connected with the capacitor C31, one end of the capacitor C31 is connected with the output end of the first operational amplifier, the other end of the capacitor C31 is connected with one end of the capacitor C33, the other end of the capacitor C33 is connected with the negative input end of the first operational amplifier, one end of the resistor R36 is connected with one end of the capacitor C33, one end of the resistor R39 is connected with one end of the resistor R36, and the other end of the resistor 539R 39 is connected with the other end of the reference ground, the other end of the resistor R36 is connected to the output end of the second operational amplifier, the positive input end of the second operational amplifier is connected to one end of the resistor R38, the other end of the resistor R38 is connected to the reference ground, one end of the capacitor C32 is connected to the negative input end of the second operational amplifier, the other end of the capacitor C32 is connected to one end of the resistor R35, one end of the resistor R33 is connected to the negative input end of the second operational amplifier, the other end of the resistor R33 is connected to one end of the capacitor C30, one end of the capacitor C30 is connected to the output end of the second operational amplifier, the other end of the capacitor C30 is connected to the other end of the capacitor C32, one end of the resistor R37 is connected to one end of the resistor R35, the other end of the resistor R37 is connected to the reference ground, and the positive voltage input end of the second operational amplifier is connected to one end of the capacitor C29, the other end of the capacitor C29 is connected with the reference ground, the negative voltage input end of the second operational amplifier is connected with one end of the capacitor C34, and the other end of the capacitor C34 is connected with the reference ground.
7. The internal resistance detection device with canceling magnetic flux according to claim 1, characterized in that: the adjustable gain amplifier module comprises a resistor R50, a resistor RV1, a resistor R51, an operational amplifier, a resistor R52 and a capacitor, wherein one end of the resistor R50 is connected with one end of the resistor RV1, the other end of the resistor R50 is connected with a reference ground, the other end of the resistor RV1 is connected with one end of the resistor R51, the other end of the resistor R51 is connected with the output end of the operational amplifier, the negative input end of the operational amplifier is connected with one end of the resistor R51, the capacitor C38 is connected with the resistor R51 in parallel, the positive input end of the operational amplifier is connected with a VIN end, the resistor R52 is connected with the resistor RV1 in parallel, the fourth pin of the resistor R52 is connected with one end of the capacitor C42, the other end of the capacitor C42 is connected with a reference ground, and the fifth pin of the resistor R52 is connected with the reference ground.
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| CN202010176823.5A CN111257777B (en) | 2020-03-13 | 2020-03-13 | Internal resistance detection device with offset magnetic flux |
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| CN202010176823.5A CN111257777B (en) | 2020-03-13 | 2020-03-13 | Internal resistance detection device with offset magnetic flux |
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| CN201037865Y (en) * | 2007-04-29 | 2008-03-19 | 比亚迪股份有限公司 | Piezoresistance testing and sorting device |
| CN101221223B (en) * | 2007-12-27 | 2011-03-16 | 武汉理工大学 | Single slice battery essential resistance and voltage on-line testing system for fuel cell pile |
| CN103713197A (en) * | 2012-09-29 | 2014-04-09 | 丹纳赫（上海）工业仪器技术研发有限公司 | Cell tester |
| CN203299350U (en) * | 2013-05-08 | 2013-11-20 | 山西大学 | Battery internal resistance on-line measuring instrument |
| CN204405742U (en) * | 2015-01-23 | 2015-06-17 | 东莞市德尔能新能源股份有限公司 | The online internal resistance measurement circuit of battery |
| US10345384B2 (en) * | 2016-03-03 | 2019-07-09 | Battelle Energy Alliance, Llc | Device, system, and method for measuring internal impedance of a test battery using frequency response |
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