CN112986635B - Programmable electronic load and battery testing device - Google Patents
Programmable electronic load and battery testing device Download PDFInfo
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- CN112986635B CN112986635B CN201911312511.6A CN201911312511A CN112986635B CN 112986635 B CN112986635 B CN 112986635B CN 201911312511 A CN201911312511 A CN 201911312511A CN 112986635 B CN112986635 B CN 112986635B
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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
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
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- 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
- G01R31/386—Arrangements for measuring battery or accumulator variables using test-loads
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- 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
- G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
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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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Measurement Of Current Or Voltage (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a programmable electronic load and a battery testing device, wherein the programmable electronic load comprises a singlechip, a first conversion circuit, a first operational amplification circuit, a switching tube, a sampling unit and a circuit board, wherein the singlechip is used for outputting a DA (digital-to-analog) value of loop current; the first conversion circuit is connected with a DA port of the single chip microcomputer and used for converting the DA value into an analog signal; the positive input end of the first operational amplification circuit is connected with the output end of the first conversion circuit and used for converting the analog signal into a switch analog signal; the control end of the switch tube is connected with the output end of the first operational amplification circuit and used for switching on or switching off according to the switch analog signal; the first end of the sampling unit is connected with the first end of the switch tube and used for generating loop current; the circuit board, singlechip, first converting circuit, first operational amplifier circuit, switch tube and sampling unit set up on the circuit board. The electronic load and the device have the advantages of low cost and more pertinence, and realize the battery test.
Description
Technical Field
The invention relates to the technical field of battery testing, in particular to a programmable electronic load and a battery testing device.
Background
At present, equipment manufacturers consider universality, and programmable electronic loads are usually used as independent products and have multiple functions, such as constant current, constant resistance, constant voltage, constant power, constant current + constant voltage, constant resistance + constant voltage and the like. And the programmable electronic load is provided with a case shell, has larger volume and can not be embedded into another circuit board for use.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a programmable electronic load, which can be used for battery testing, does not cause waste of functions, and can be used in combination with other circuit boards, and has strong versatility.
The invention also aims to provide a battery testing device.
In order to achieve the above object, a programmable electronic load according to an embodiment of the first aspect of the present invention, for battery testing, includes: the singlechip is used for outputting the DA value of the loop current; the first conversion circuit is connected with a DA port of the single chip microcomputer and used for converting the DA value into an analog signal; the positive input end of the first operational amplifier circuit is connected with the output end of the first conversion circuit and is used for converting the analog signal into a switch analog signal; the control end of the switch tube is connected with the output end of the first operational amplification circuit and used for switching on or switching off according to the switch analog signal; the first end of the sampling unit is connected with the first end of the switch tube and used for generating loop current; the circuit board, the singlechip, the first conversion circuit, the first operational amplification circuit, the switch tube and the sampling unit are arranged on the circuit board.
According to the programmable electronic load provided by the embodiment of the invention, by arranging each circuit element on the circuit board, a larger chassis shell is not needed, the size is small, the programmable electronic load can be combined with other circuit boards such as a battery protection board, the programmable electronic load is more flexible, and the programmable electronic load can be used for testing batteries without wasting functions.
In order to achieve the above object, a battery testing device according to an embodiment of the second aspect of the present invention includes a battery protection board and the programmable electronic load, where the battery protection board is connected in series with the programmable electronic load in a loop of a battery, a first end of the battery protection board is connected to a second end of a switch tube in the programmable electronic load, and a second end of the battery protection board is connected to a second end of a sampling unit in the programmable electronic load.
By adopting the programmable electronic load of the embodiment of the invention, the battery testing device has low cost, does not cause function waste, and can realize the time for protecting the related functions of the battery protection board.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram of a programmable electronic load according to one embodiment of the invention;
FIG. 2 is a schematic diagram of a battery testing apparatus with a programmable electronic load coupled with a battery protection board in accordance with one embodiment of the present invention;
fig. 3 is a block diagram of a programmable electronic load according to one embodiment of the invention;
FIG. 4 is a schematic diagram of a programmable electronic load closed-loop control circuit connection according to one embodiment of the present invention;
fig. 5 is a circuit diagram of a comparator circuit according to one embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
A programmable electronic load according to an embodiment of the invention is described below with reference to fig. 1-5.
Fig. 1 is a block diagram of a programmable electronic load according to an embodiment of the present invention, and as shown in fig. 1, the programmable electronic load 1 according to the embodiment of the present invention includes a single chip microcomputer 10, a first conversion circuit 20, a first operational amplifier circuit 30, a switch tube 40, a sampling unit 50, and a circuit board 60.
When testing a battery, the programmable electronic load 1 of the embodiment of the present invention may be connected in series with the battery protection board 2 in a loop of the battery, and a loop current in the loop may be controlled by the programmable electronic load 1 to determine a protection current range in which the battery protection can be achieved by the battery board 2.
The single chip microcomputer 10 is configured to output a DA value of the loop current, and the single chip microcomputer 10 may pre-store DA values corresponding to a plurality of current values for controlling the loop current. The first conversion circuit 20 is connected to a DA port of the single chip microcomputer 10 and configured to convert the DA value into an analog signal, for example, the first conversion circuit 20 may be a digital-to-analog conversion circuit, and performs digital-to-analog conversion on the DA value to output an analog signal corresponding to the DA value. The positive input terminal of the first operational amplifier circuit 30 is connected to the output terminal of the first conversion circuit 20, and is configured to convert the analog signal into a switching analog signal. The control end of the switch tube 40 is connected with the output end of the first operational amplifier circuit 30 and is used for switching on or off according to the switch analog signal; the first terminal of the sampling unit 50 is connected to the first terminal of the switch tube 40 for generating the loop current, and in an embodiment, the sampling unit 50 may include a low temperature drift resistor, or a series-parallel circuit of resistors, or other realizable components or circuit structures.
In the embodiment of the present invention, the single chip microcomputer 10, the first conversion circuit 20, the first operational amplifier circuit 30, the switch tube 40, and the sampling unit 50 are disposed on the circuit board 60. And, as shown in fig. 2, when testing the battery, the circuit board 60 of the embodiment of the present invention may be used in combination with other circuit boards, for example, the first end of the battery protection board 2 may be connected to the second end of the switch tube 40 in the programmable electronic load 1, the second end of the battery protection board 2 may be connected to the second end of the sampling unit 50 in the programmable electronic load 1, so that the battery protection board 2 and the programmable electronic load 1 are connected in series in the battery loop, and the single chip 10 outputs different DA values to adjust the loop current generated by the sampling unit 50, thereby determining the range of the protection current of the battery protection board 2.
According to the programmable electronic load 1 of the embodiment of the invention, by arranging the circuit elements on the circuit board 60, a larger case shell is not needed, the size is small, the programmable electronic load can be combined with other circuit boards such as the battery protection board 2, the programmable electronic load is more flexible, and the programmable electronic load can be used for testing batteries without wasting functions.
Further, as shown in fig. 3, the programmable electronic load 1 according to the embodiment of the present invention further includes a differential amplifier circuit 70, the differential amplifier circuit 70 is disposed on the circuit board 60, and an input end of the differential amplifier circuit 70 is connected to a negative input end of the first operational amplifier 30, and is configured to collect voltages at two ends of the sampling unit 50 and output a differential signal, so as to adjust a loop current of the sampling unit 50.
For example, fig. 4 is a schematic circuit connection diagram of the programmable electronic load closed-loop control according to an embodiment of the present invention, and as shown in fig. 4, the DA value output by the single chip microcomputer 10 is converted and transmitted to the + terminal of the amplifier OP1 in the first operational amplifier circuit 30, at this time, the _ terminal of the amplifier OP1, the OP1_ Out, the load-terminal of the sampling unit 50, and the OP2_ Out of the amplifier OP2 in the differential amplifier circuit 70 are all zero. After the single chip microcomputer 10 outputs the DA value, the + terminal of the OP1 starts to be increased, and the _ terminal of the OP1 is still zero, so that the OP1_ Out is increased, the switching tube 40 starts to be conducted, the voltage at the two terminals of the sampling unit 50 starts to be increased, the sampling unit 50 forms current and is increased, the OP2 collects the voltage difference at the two terminals of the sampling unit 50, the amplified voltage is output to the reverse input terminal, namely the-terminal, of the OP1, the voltage difference between the positive input terminal and the negative input terminal of the OP1 is reduced, the OP1_ Out output is reduced, the voltage at the two terminals of the sampling unit 50 finally reaches the steady state corresponding to the output DA value of the single chip microcomputer 10, and the set voltage is formed at the sampling unit 50, so that the loop current control is more accurate.
Further, the programmable electronic load 1 of the embodiment of the present invention may further capture a current delay time, and may determine a time duration of the current protection function of the battery protection board 2.
As shown in fig. 3, the programmable electronic load 1 of the embodiment of the present invention further includes a comparator circuit 80, where the comparator circuit 80 is disposed on the circuit board 60, and is configured to obtain voltage signals at two ends of the sampling unit 50, and send out a trigger signal when the voltage signals suddenly change; the single chip microcomputer 10 comprises a capturing unit 11, wherein the capturing unit 11 acquires the trigger signal and determines the current delay time according to the delay time of the two trigger signals.
The programmable electronic load 1 further includes a second operational amplifier circuit 90 and a second conversion circuit 91, wherein the second operational amplifier circuit 90 is disposed on the circuit board 60, and is respectively connected to the comparator circuit 80 and the sampling unit 50, for collecting the voltages at the two ends of the sampling unit 50, and amplifying the voltages at the two ends of the sampling unit 50 to output voltage signals at the two ends of the sampling unit 50. The second conversion circuit 91 is disposed on the circuit board 60, and is respectively connected to the comparator circuit 80 and the single chip microcomputer 10, and is configured to convert the trigger signal into a digital signal and transmit the digital signal to the single chip microcomputer 10.
Specifically, when the current delay time is captured, the single chip microcomputer 10 outputs the DA value to control the sampling unit 50 to generate a large current, for example, a generated loop current is larger than a protection current of the battery protection board 2. The second operational amplifier circuit 90 collects the voltages at the two ends of the sampling unit 50, amplifies the voltages and outputs the amplified voltages to the comparator circuit 80, the output end of the comparator circuit 80 is converted from a low-level signal to a high-level signal, that is, a rising edge is generated, a trigger signal is sent out once, the single chip microcomputer 10 captures the trigger signal, for example, T1, meanwhile, the battery protection board 2 connected in series with the programmable electronic load 1 of the embodiment of the present invention senses that the loop current generated by the sampling unit 50 is greater than the allowable protection current threshold, the loop current of the battery loop is cut off after a preset time, the output end of the comparator circuit 80 is converted from the high level to the low level, the trigger signal is sent out again, the single chip microcomputer 10 captures the trigger signal, for example, T2, and can calculate the current delay time from T2 to T1, thereby capturing the time of the current protection function related to the battery 2.
In some embodiments, the second operational amplifier 90 may employ an instrumentation amplifier circuit, which may have higher precision and may obtain a more precise voltage signal.
In an embodiment, the comparator circuit 80 may adopt a window amplifier circuit or a delay comparator circuit, for example, fig. 5 is a circuit diagram of a comparator circuit according to an embodiment of the present invention, as shown in fig. 5, the comparator circuit 80 includes a first resistor R1, a first inductor L1, a second resistor R2, a comparator OP3, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6, wherein a first end of the first resistor R1 is connected to a predetermined power source, a second end of the first resistor R1 is connected to a first end of the first inductor L1, a second end of the first inductor L1 is connected to a first end of the second resistor R2, and a second end of the second resistor R2 is grounded; the negative phase input end of the comparator OP3 is connected with the third end of the first inductor L1, and the positive input end of the comparator OP3 is connected with the output end of the second operational amplifier 90 through a third resistor R3; a first end of the fourth resistor R4 is connected with a preset power supply, a second end of the fourth resistor R4 is connected with a first end of the fifth resistor R5, a second end of the fifth resistor R5 is grounded, and a first node O1 is arranged between the second end of the fourth resistor R4 and the first end of the fifth resistor R5; the output end of the comparator OP3 is connected to the input end of the second conversion circuit 91 through the first node O1; a first end of the sixth resistor R6 is connected to the positive input terminal of the comparator OP3, and a second end of the sixth resistor R6 is connected between the first node O1 and the input terminal of the second conversion circuit 91.
The first resistor R1, the first inductor L1 and the second resistor R2 provide a reference voltage of the comparator OP3, and when an input signal of a forward input end of the comparator OP3 is lower than the reference voltage, the trigger signal is reversely output and transmitted to the single chip microcomputer 10, so that current delay time is captured.
In summary, the programmable electronic load 1 of the embodiment of the present invention adopts a card type, and can be embedded into other circuit boards for use, so as to form a complete test system for a battery; and, have the capture function of the current delay time, can be accurate to 1us; the discharge time can be accurately controlled, and the method can be used for testing the Turbo function of the battery; and other circuits or components can be further arranged on the circuit board 60 of the programmable electronic load 1 and subjected to software programming to realize the required functions, and the expansibility is realized.
The battery testing device of the embodiment of the invention has low cost, does not cause function waste and can realize the time for protecting the related functions of the battery protection board 2 by adopting the programmable electronic load 1 of the above embodiment.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A programmable electronic load for testing a battery, wherein the programmable electronic load is in a card type and is embedded into another circuit board for use, so as to form a complete testing system for the battery, and the programmable electronic load comprises:
the singlechip is used for outputting the DA value of the loop current;
the first conversion circuit is connected with a DA port of the single chip microcomputer and used for converting the DA value into an analog signal;
the positive input end of the first operational amplification circuit is connected with the output end of the first conversion circuit and is used for converting the analog signal into a switch analog signal;
the control end of the switch tube is connected with the output end of the first operational amplification circuit and used for switching on or switching off according to the switch analog signal;
the first end of the sampling unit is connected with the first end of the switch tube and used for generating loop current, the first end of the battery protection board is connected with the second end of the switch tube, and the second end of the battery protection board is connected with the second end of the sampling unit;
the circuit board is provided with the single chip microcomputer, the first conversion circuit, the first operational amplification circuit, the switch tube and the sampling unit;
the comparator circuit is arranged on the circuit board and used for acquiring voltage signals at two ends of the sampling unit and sending out a trigger signal when the voltage signals are suddenly changed;
the single chip microcomputer comprises a capturing unit, the capturing unit acquires the trigger signal and determines current delay time according to the delay time of the two trigger signals;
and the second operational amplification circuit is arranged on the circuit board, is respectively connected with the comparator circuit and the sampling unit, and is used for collecting the voltages at the two ends of the sampling unit and amplifying the voltages at the two ends of the sampling unit and then outputting voltage signals at the two ends of the sampling unit.
2. The programmable electronic load according to claim 1, further comprising:
and the input end of the differential amplification circuit is connected with the negative input end of the first operational amplifier and is used for acquiring voltages at two ends of the sampling unit and outputting a differential signal so as to adjust the loop current of the sampling unit.
3. The programmable electronic load of claim 1, further comprising:
and the second conversion circuit is arranged on the circuit board, is respectively connected with the comparator circuit and the singlechip, and is used for converting the trigger signal into a digital signal and transmitting the digital signal to the singlechip.
4. The programmable electronic load according to claim 3, wherein the comparator circuit comprises:
the circuit comprises a first resistor, a first inductor and a second resistor, wherein a first end of the first resistor is connected with a preset power supply, a second end of the first resistor is connected with a first end of the first inductor, a second end of the first inductor is connected with a first end of the second resistor, and a second end of the second resistor is grounded;
a negative phase input end of the comparator is connected with a third end of the first inductor, and a positive input end of the comparator is connected with an output end of the second operational amplifier through a third resistor;
the first end of the fourth resistor is connected with a preset power supply, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is grounded, and a first node is arranged between the second end of the fourth resistor and the first end of the fifth resistor;
the output end of the comparator is connected with the input end of the second conversion circuit through the first node;
and a first end of the sixth resistor is connected with the positive input end of the comparator, and a second end of the sixth resistor is connected between the first node and the input end of the second conversion circuit.
5. The programmable electronic load of claim 1, wherein the sampling unit comprises a low temperature drift resistor.
6. The programmable electronic load of claim 1, wherein the second operational amplification circuit comprises an instrumentation amplifier circuit.
7. A battery testing device, comprising a battery protection board and the programmable electronic load as claimed in any one of claims 1 to 6, wherein the battery protection board is connected in series with the programmable electronic load in a loop of a battery, wherein a first end of the battery protection board is connected to a second end of a switch tube in the programmable electronic load, and a second end of the battery protection board is connected to a second end of a sampling unit in the programmable electronic load.
8. The battery testing apparatus according to claim 7,
the battery protection board is used for detecting that the loop current generated by the sampling unit is greater than a protection current threshold value, and cutting off the loop current of the battery loop after preset time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911312511.6A CN112986635B (en) | 2019-12-18 | 2019-12-18 | Programmable electronic load and battery testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911312511.6A CN112986635B (en) | 2019-12-18 | 2019-12-18 | Programmable electronic load and battery testing device |
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| CN112986635A CN112986635A (en) | 2021-06-18 |
| CN112986635B true CN112986635B (en) | 2023-04-07 |
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| CN203117783U (en) * | 2013-03-06 | 2013-08-07 | 北京经纬恒润科技有限公司 | Electronic load unit |
| CN103344904B (en) * | 2013-06-13 | 2015-11-18 | 福建联迪商用设备有限公司 | A kind of for checking simulation lithium battery method of testing and the circuit of product charging circuit |
| CN104422833A (en) * | 2013-08-29 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Charging and discharging detecting device |
| CN204166424U (en) * | 2014-11-06 | 2015-02-18 | 浙江师范大学 | Simple intelligent High-accuracy direct current electronic load |
| CN104502672B (en) * | 2015-01-09 | 2017-10-10 | 云南卓烁科技有限公司 | A kind of current signal demodulator circuit |
| CN204575774U (en) * | 2015-05-06 | 2015-08-19 | 艾德克斯电子（南京）有限公司 | There is the programmable electronic load of direct current resistance measuring ability |
| CN107167677B (en) * | 2017-04-27 | 2020-08-14 | 广东机电职业技术学院 | Simulation test device and test method for battery management system |
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| CN103063925A (en) * | 2012-12-14 | 2013-04-24 | 芜湖天元汽车电子有限公司 | Measuring method and device of lithium battery protective plate internal resistance |
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| CN108063428A (en) * | 2017-09-23 | 2018-05-22 | 华为技术有限公司 | A kind of apparatus for protecting power supply and the terminal using described device |
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