CN112611910A - Battery current sampling device - Google Patents
Battery current sampling device Download PDFInfo
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- CN112611910A CN112611910A CN202011371371.2A CN202011371371A CN112611910A CN 112611910 A CN112611910 A CN 112611910A CN 202011371371 A CN202011371371 A CN 202011371371A CN 112611910 A CN112611910 A CN 112611910A
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- 238000005070 sampling Methods 0.000 title claims abstract description 108
- 238000004364 calculation method Methods 0.000 claims abstract description 29
- 239000003990 capacitor Substances 0.000 claims description 21
- 230000003321 amplification Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 230000003750 conditioning effect Effects 0.000 claims description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 12
- 238000002955 isolation Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 230000001143 conditioned effect Effects 0.000 claims description 3
- 230000002238 attenuated effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
-
- G—PHYSICS
- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
Abstract
The invention provides a battery current sampling device, which is applied to the technical field of current sampling and comprises the following components: the device comprises a current sampling unit, a frequency sampling unit and a processor; the current sampling unit is used for acquiring a battery current signal corresponding to a target battery and sending the battery current signal to the processor; the frequency sampling unit is used for collecting an alternating voltage signal corresponding to the target battery and sending the alternating voltage signal to the processor; the processor is used for determining alternating current frequency according to the alternating voltage signal, determining a sampling calculation period according to the alternating current frequency, and performing sampling calculation on the battery current signal based on the sampling calculation period to obtain a current sampling value of the target battery. The invention considers the influence of the direct current ripple on the battery current collection and can more accurately realize the sampling of the battery current.
Description
Technical Field
The invention belongs to the technical field of current sampling, and particularly relates to a battery current sampling device.
Background
In the prior art, when a battery current is sampled, a current sampling circuit is usually used to collect current signals at two ends of the battery, and the collected current signals are subjected to data processing and then used as current sampling values of the battery. However, the inventors of the present application found that the above sampling scheme has the following problems:
in the practical application process, the battery is usually connected to the dc bus together with the load, the inverter and the like, the disturbance generated by the load is easy to generate ripple on the dc bus, the ripple problem is not considered in the existing data processing of the battery current signal, and the battery current sampling value obtained by applying the existing scheme is inaccurate.
Disclosure of Invention
The invention aims to provide a battery current sampling device to solve the technical problem that battery current sampling in the prior art is not accurate enough.
In order to achieve the above object, the present invention adopts a technical solution of providing a battery current sampling device, including:
the device comprises a current sampling unit, a frequency sampling unit and a processor;
the current sampling unit is used for acquiring a battery current signal corresponding to a target battery and sending the battery current signal to the processor;
the frequency sampling unit is used for collecting an alternating voltage signal corresponding to the target battery and sending the alternating voltage signal to the processor;
the processor is used for determining alternating current frequency according to the alternating voltage signal, determining a sampling calculation period according to the alternating current frequency, and performing sampling calculation on the battery current signal based on the sampling calculation period to obtain a current sampling value of the target battery.
Optionally, the current sampling unit includes a current sensor, a first amplifying circuit, and a bias circuit connected in series;
the current sensor is used for detecting a battery current signal corresponding to the target battery and sending the battery current signal to the first amplifying circuit;
the first amplifying circuit is used for amplifying the battery current signal and sending the amplified battery current signal to the biasing circuit;
the bias circuit is used for superposing forward bias on the amplified battery current signal and sending the battery current signal superposed with the forward bias to the processor.
Optionally, the current sampling unit further includes a clamping circuit, and the clamping circuit is connected between the biasing circuit and the processor;
the bias circuit is used for sending the battery current signal after the positive bias is superposed to the processor through the clamping circuit.
Optionally, the frequency sampling unit includes a signal conditioning circuit and a square wave conversion circuit connected in series;
the signal conditioning circuit is used for being connected with the alternating current power supply, conditioning the alternating current voltage signal and sending the conditioned alternating current voltage signal to the square wave conversion circuit;
the square wave conversion circuit is used for converting the signal-conditioned alternating voltage signal into a square wave signal and sending the square wave signal to the processor.
Optionally, the signal conditioning circuit includes an attenuation circuit, an isolation circuit, a second amplification circuit, and a low-pass filter circuit connected in series;
the attenuation circuit is used for being connected with the alternating current power supply, attenuating the alternating current voltage signal and sending the attenuated alternating current voltage signal to the second amplification circuit through the isolation circuit;
the second amplifying circuit is used for amplifying the alternating voltage signal after the attenuation processing and sending the alternating voltage signal after the amplification processing to the low-pass filter circuit;
the low-pass filter circuit is used for performing low-pass filtering on the amplified alternating voltage signal and sending the alternating voltage signal subjected to the low-pass filtering to the square wave conversion circuit.
Optionally, the first amplifying circuit includes a first resistor, a second resistor, a first capacitor, and a comparator;
the first end of the first resistor is used for being connected with the current sensor, and the second end of the first resistor is respectively connected with the first end of the second resistor, the first end of the first capacitor and the negative input end of the comparator; the positive input end of the comparator is connected with a first preset voltage;
and the second end of the second resistor is respectively connected with the second end of the first capacitor, the output end of the comparator and the bias circuit.
Optionally, the bias circuit includes a third resistor and a fourth resistor;
the first end of the third resistor is connected with the first amplifying circuit, and the second end of the third resistor is respectively connected with the first end of the fourth resistor and the processor;
and the second end of the fourth resistor is connected with a second preset voltage.
Optionally, the circuit where the target battery is located is a phase-controlled rectification circuit, and the alternating-current frequency and the sampling calculation period are in a linear relationship.
Optionally, the clamping circuit includes a first diode, a second diode, and a second capacitor;
the positive end of the first diode is connected with the bias circuit, the negative end of the second diode is connected with the first end of the second capacitor, and the negative end of the first diode is connected with a third preset voltage;
and the positive electrode end of the second diode is connected with a first preset voltage, and the positive electrode end of the second diode is connected with the second end of the second capacitor.
Optionally, the processor is configured to calculate an average value of the battery current signals in the sampling calculation period, so as to obtain a current sampling value of the target battery.
The battery current sampling device provided by the invention has the beneficial effects that:
the inventor of the present application finds that the frequency of the dc ripple (or the frequency of the battery charging current ripple) generated on the dc bus by the load disturbance is related to the ac frequency (or the frequency of the utility power) corresponding to the dc bus, so the present invention introduces the ac frequency into the calculation of the target battery current sampling value based on the correlation between the ac frequency and the dc ripple, that is, unlike the prior art, the present invention considers the influence of the dc ripple on the calculation of the current sampling value. On the basis, the period of sampling calculation is determined based on the alternating current frequency, the situation that the sampling calculation period cannot cover a complete direct current ripple when the current sampling value is calculated is avoided, and therefore the current sampling value of the battery can be calculated more accurately. Namely, the battery current sampling device provided by the invention can realize accurate sampling of the battery current.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery current sampling apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a current sampling unit according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery current sampling apparatus according to an embodiment of the present invention, the battery current sampling apparatus includes:
a current sampling unit 10, a frequency sampling unit 20 and a processor 30.
The current sampling unit 10 is configured to collect a battery current signal corresponding to the target battery, and send the battery current signal to the processor 30.
The frequency sampling unit 20 is configured to collect an ac voltage signal corresponding to the target battery, and send the ac voltage signal to the processor 30.
The processor 30 is configured to determine an ac frequency according to the ac voltage signal, determine a sampling calculation period according to the ac frequency, and perform sampling calculation on the battery current signal based on the sampling calculation period to obtain a current sampling value of the target battery.
In this embodiment, the battery current signal corresponding to the target battery is also the charging current signal of the target battery, and the ac voltage signal corresponding to the target battery refers to an ac voltage signal directly communicated with the target battery, and may be an ac voltage signal provided by the utility power to the target battery, or may be ac voltage signals on both sides of a load connected to the target battery.
In this embodiment, the processor may be a DSP digital processor.
Optionally, as a specific implementation manner of the battery current sampling apparatus provided in the embodiment of the present invention, if the charging circuit where the target battery is located is a phase-controlled rectification circuit, the ac frequency and the sampling calculation period are in a linear relationship. If the charging circuit where the target battery is located is not a phase-control rectifying circuit, the correlation between the alternating current frequency and the sampling calculation period can be determined by a simulation experiment method, and then the sampling calculation period is calculated based on the alternating current frequency and the correlation.
In this embodiment, a sampling calculation period may be determined according to the ac frequency, so as to ensure that the sampling calculation period can cover a period of a dc ripple on a dc bus where the battery is located, so that a calculated current sampling value can better conform to an actual current value of a target battery. Alternatively, the sampling calculation period may be an integer multiple of the aforementioned dc ripple period.
In this embodiment, the sampling calculation of the battery current signal based on the sampling calculation period to obtain the current sampling value of the target battery may be detailed as follows: and calculating the average value of the battery current signals in the sampling calculation period to obtain the current sampling value of the target battery.
Optionally, referring to fig. 1 and fig. 2, as a specific implementation of the battery current sampling apparatus provided in the embodiment of the present invention, the current sampling unit includes a current sensor 11, a first amplifying circuit 12, and a bias circuit 13 connected in series.
The current sensor 11 is configured to detect a battery current signal corresponding to the target battery, and send the battery current signal to the first amplifying circuit 12.
The first amplifying circuit 12 is configured to amplify the battery current signal and send the amplified battery current signal to the bias circuit 13.
The bias circuit 13 is configured to superimpose a forward bias on the amplified battery current signal, and send the battery current signal superimposed with the forward bias to the processor 30.
In this embodiment, the current sensor 11 may be a hall current sensor, the first amplifying circuit 12 may be implemented based on a comparator circuit, and the bias circuit 13 may be implemented based on a pull-up resistor.
Optionally, referring to fig. 1 and fig. 2, as a specific implementation of the battery current sampling apparatus provided in the embodiment of the present invention, the current sampling unit 10 may further include a clamping circuit 14, and the clamping circuit 14 is connected between the bias circuit 13 and the processor 30.
The bias circuit 13 is configured to send the battery current signal with the positive bias superimposed to the processor 30 through the clamp circuit 14.
In the present embodiment, the clamp circuit 14 is used to limit the potential of the output terminal of the current sampling unit to a certain value to protect the processor 30.
Optionally, as a specific implementation manner of the battery current sampling apparatus provided in the embodiment of the present invention, the frequency sampling unit includes a signal conditioning circuit and a square wave conversion circuit, which are connected in series.
The signal conditioning circuit is used for being connected with an alternating current power supply, conditioning the alternating current voltage signal and sending the conditioned alternating current voltage signal to the square wave conversion circuit.
The square wave conversion circuit is used for converting the signal-conditioned alternating voltage signal into a square wave signal and sending the square wave signal to the processor.
In this embodiment, the signal conditioning circuit may include an attenuation circuit, an isolation circuit, a second amplification circuit, and a low pass filter circuit connected in series.
The attenuation circuit is used for being connected with an alternating current power supply, carrying out attenuation processing on the alternating current voltage signal and sending the alternating current voltage signal after the attenuation processing to the second amplification circuit through the isolation circuit.
The second amplifying circuit is used for amplifying the alternating voltage signal after the attenuation processing and sending the alternating voltage signal after the amplification processing to the low-pass filter circuit.
The low-pass filter circuit is used for carrying out low-pass filtering on the amplified alternating voltage signal and sending the alternating voltage signal subjected to the low-pass filtering to the square wave conversion circuit.
In this embodiment, the attenuation circuit may be implemented by dividing voltages through a plurality of resistors, the isolation circuit may be an isolation amplifier, the second amplification circuit may be implemented based on a comparator circuit, and the low-pass filter circuit may be implemented based on a comparator circuit and a filter capacitor. Preferably, the low-pass filter circuit is an active low-pass filter circuit.
In this embodiment, the square wave converting circuit may be implemented based on a comparator circuit, which converts the ac voltage signal into a signal in the form of a square wave (i.e., a square wave signal) and sends the square wave signal to the processor.
Optionally, referring to fig. 1 and fig. 2, as a specific implementation of the battery current sampling apparatus provided in the embodiment of the present invention, the first amplifying circuit 12 includes a first resistor R22, a second resistor R21, a first capacitor C10, and a comparator IC 4A.
A first end of the first resistor R22 is used for being connected with the current sensor 11, and a second end of the first resistor R22 is respectively connected with a first end of the second resistor R21, a first end of the first capacitor C10 and a negative input end of the comparator IC 4A. The positive input of the comparator IC4A is connected to a first predetermined voltage (corresponding to the voltage of 0V in fig. 2).
A second terminal of the second resistor R21 is connected to the second terminal of the first capacitor C10, the output terminal of the comparator IC4A, and the bias circuit 13, respectively.
Optionally, referring to fig. 1 and fig. 2, as a specific implementation of the battery current sampling apparatus provided in the embodiment of the present invention, the bias circuit 13 includes a third resistor R20 and a fourth resistor R18.
A first end of the third resistor R20 is connected to the first amplifier circuit 12, and a second end of the third resistor R20 is connected to a first end of the fourth resistor R18 and the processor 30, respectively.
The second terminal of the fourth resistor R18 is connected to a second predetermined voltage (corresponding to +1.65V in fig. 2).
In this embodiment, the bias circuit 13 is configured to provide a forward bias for the acquired battery current signal, so as to raise a signal value of the battery current signal, and prevent the current sampling unit 10 from acquiring only a positive value of the target battery current signal. That is to say, the bias circuit provided by the embodiment of the invention can ensure that the battery current sampling device acquires the negative value of the target battery current signal, and more accurately realize battery current sampling.
Optionally, referring to fig. 1 and fig. 2, as a specific implementation of the battery current sampling apparatus provided in the embodiment of the present invention, the bias circuit 13 includes a third resistor R20 and a fourth resistor R18.
A first end of the third resistor R20 is connected to the first amplifier circuit 12, and a second end of the third resistor R20 is connected to a first end of the fourth resistor R18 and the clamp circuit 14, respectively.
The second terminal of the fourth resistor R18 is connected to a second predetermined voltage (corresponding to +1.65V in fig. 2).
In this embodiment, if the clamping circuit 14 is added to the current sampling unit 10, the clamping circuit 14 may be disposed between the bias circuit 13 and the processor 30, that is, the second end of the third resistor R20 is connected to the clamping circuit 14.
Optionally, referring to fig. 2, as a specific implementation of the battery current sampling apparatus provided in the embodiment of the present invention, the clamping circuit 14 includes a first diode D3, a second diode D4, and a second capacitor C9.
The positive terminals of the first diode D3 are respectively connected with the bias circuit 13, the negative terminal of the second diode D4 is connected with the first terminal of the second capacitor C9, and the negative terminal of the first diode D3 is connected with the third preset voltage corresponding to the VDD33 voltage in fig. 2).
The anode of the second diode D4 is connected to the first preset voltage, and the anode of the second diode D4 is connected to the second terminal of the second capacitor C9.
In the present embodiment, the clamping may be implemented by a clamping diode, wherein the second capacitor C9 is a filter capacitor for filtering out high frequency components in the battery current signal.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A battery current sampling device, comprising:
the device comprises a current sampling unit, a frequency sampling unit and a processor;
the current sampling unit is used for acquiring a battery current signal corresponding to a target battery and sending the battery current signal to the processor;
the frequency sampling unit is used for collecting an alternating voltage signal corresponding to the target battery and sending the alternating voltage signal to the processor;
the processor is used for determining alternating current frequency according to the alternating voltage signal, determining a sampling calculation period according to the alternating current frequency, and performing sampling calculation on the battery current signal based on the sampling calculation period to obtain a current sampling value of the target battery.
2. The battery current sampling device according to claim 1, wherein the current sampling unit includes a current sensor, a first amplification circuit, a bias circuit connected in series;
the current sensor is used for detecting a battery current signal corresponding to the target battery and sending the battery current signal to the first amplifying circuit;
the first amplifying circuit is used for amplifying the battery current signal and sending the amplified battery current signal to the biasing circuit;
the bias circuit is used for superposing forward bias on the amplified battery current signal and sending the battery current signal superposed with the forward bias to the processor.
3. The battery current sampling apparatus of claim 2, wherein the current sampling unit further comprises a clamping circuit connected between the biasing circuit and the processor;
the bias circuit is used for sending the battery current signal after the positive bias is superposed to the processor through the clamping circuit.
4. The battery current sampling device according to claim 1, wherein the frequency sampling unit comprises a signal conditioning circuit, a square wave conversion circuit connected in series;
the signal conditioning circuit is used for being connected with the alternating current power supply, conditioning the alternating current voltage signal and sending the conditioned alternating current voltage signal to the square wave conversion circuit;
the square wave conversion circuit is used for converting the signal-conditioned alternating voltage signal into a square wave signal and sending the square wave signal to the processor.
5. The battery current sampling device of claim 4, wherein the signal conditioning circuit comprises an attenuation circuit, an isolation circuit, a second amplification circuit, and a low pass filter circuit connected in series;
the attenuation circuit is used for being connected with the alternating current power supply, attenuating the alternating current voltage signal and sending the attenuated alternating current voltage signal to the second amplification circuit through the isolation circuit;
the second amplifying circuit is used for amplifying the alternating voltage signal after the attenuation processing and sending the alternating voltage signal after the amplification processing to the low-pass filter circuit;
the low-pass filter circuit is used for performing low-pass filtering on the amplified alternating voltage signal and sending the alternating voltage signal subjected to the low-pass filtering to the square wave conversion circuit.
6. The battery current sampling device of claim 2, wherein the first amplification circuit comprises a first resistor, a second resistor, a first capacitor, a comparator;
the first end of the first resistor is used for being connected with the current sensor, and the second end of the first resistor is respectively connected with the first end of the second resistor, the first end of the first capacitor and the negative input end of the comparator; the positive input end of the comparator is connected with a first preset voltage;
and the second end of the second resistor is respectively connected with the second end of the first capacitor, the output end of the comparator and the bias circuit.
7. The battery current sampling device of claim 2, wherein the bias circuit comprises a third resistor and a fourth resistor;
the first end of the third resistor is connected with the first amplifying circuit, and the second end of the third resistor is respectively connected with the first end of the fourth resistor and the processor;
and the second end of the fourth resistor is connected with a second preset voltage.
8. The battery current sampling device according to claim 1, wherein the charging circuit in which the target battery is located is a phase-controlled rectifying circuit, and the ac frequency is linear with the sampling calculation period.
9. The battery current sampling apparatus of claim 3, wherein the clamping circuit comprises a first diode, a second diode, and a second capacitor;
the positive end of the first diode is connected with the bias circuit, the negative end of the second diode is connected with the first end of the second capacitor, and the negative end of the first diode is connected with a third preset voltage;
and the positive electrode end of the second diode is connected with a first preset voltage, and the positive electrode end of the second diode is connected with the second end of the second capacitor.
10. The battery current sampling device of claim 1, wherein the processor is configured to calculate an average value of the battery current signal over the sampling calculation period to obtain the current sample value of the target battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011371371.2A CN112611910B (en) | 2020-11-30 | 2020-11-30 | Battery current sampling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011371371.2A CN112611910B (en) | 2020-11-30 | 2020-11-30 | Battery current sampling device |
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| CN112611910B CN112611910B (en) | 2024-02-06 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120153934A1 (en) * | 2010-12-16 | 2012-06-21 | Hubei Shengjia Electric Apparatus Co., Ltd. | Voltage and current sampling device |
| CN106612084A (en) * | 2015-10-20 | 2017-05-03 | 沈阳新松机器人自动化股份有限公司 | Current sampling processing circuit and current sampling processing method |
| CN207516517U (en) * | 2017-07-18 | 2018-06-19 | 朝阳市加华电子有限公司 | Storage battery monitoring device |
| CN111313725A (en) * | 2020-02-25 | 2020-06-19 | 惠州拓邦电气技术有限公司 | High-precision real-time alternating voltage sampling circuit and switching power supply |
-
2020
- 2020-11-30 CN CN202011371371.2A patent/CN112611910B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120153934A1 (en) * | 2010-12-16 | 2012-06-21 | Hubei Shengjia Electric Apparatus Co., Ltd. | Voltage and current sampling device |
| CN106612084A (en) * | 2015-10-20 | 2017-05-03 | 沈阳新松机器人自动化股份有限公司 | Current sampling processing circuit and current sampling processing method |
| CN207516517U (en) * | 2017-07-18 | 2018-06-19 | 朝阳市加华电子有限公司 | Storage battery monitoring device |
| CN111313725A (en) * | 2020-02-25 | 2020-06-19 | 惠州拓邦电气技术有限公司 | High-precision real-time alternating voltage sampling circuit and switching power supply |
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