CN207318677U - Controllable dry cell discharge curve measuring circuit - Google Patents
Controllable dry cell discharge curve measuring circuit Download PDFInfo
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- CN207318677U CN207318677U CN201721261284.5U CN201721261284U CN207318677U CN 207318677 U CN207318677 U CN 207318677U CN 201721261284 U CN201721261284 U CN 201721261284U CN 207318677 U CN207318677 U CN 207318677U
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- constant current
- current source
- source chip
- dry cell
- measuring circuit
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Abstract
The utility model proposes a kind of controllable dry cell discharge curve measuring circuit to include control module, MCU processors, ammeter, tested battery；Tested anode connection ammeter, ammeter link control module；Control module includes constant current source chip, divider resistance unit, test resistance unit；Test resistance unit connects the input pin of constant current source chip, the control pin connection divider resistance unit of constant current source chip；The ground pin connection of constant current source chip is tested the anode of battery；Constant current source chip connects MCU processors, MCU processors connection host computer；Now it is harmonious by adjusting variable resistor and constant current source chip and carries out the setting of test electric current, realizes the purpose that the I-V characteristic curve of cell is tested under various discharge currents；Test result record is sent to host computer by MCU processors, can accurately calculate and show VA characteristic curve, so that tester selects the suitable battery of performance, prevents selection excess capacity battery from causing the wasting of resources.
Description
Technical field
Dry cell field of measuring technique is the utility model is related to, more particularly to a kind of controllable dry cell discharge curve measurement
Circuit.
Background technology
The advantages of dry cell is convenient for carrying with it becomes the various electronics such as flashlight lighting, electronic toy, radio
First choice；Therefore the performance and used life of dry cell directly print influences the use of the electronic equipment；And existing dry cell
Measuring apparatus can only possess the voltage function of the tested battery of display, it is impossible to accurately calculate the VA characteristic curve of the tested battery,
And the low power dissipation electron product of existing dry cell power supply, need to know discharge curve of the dry cell under a variety of electric currents mostly,
Can just calculate battery capacity meet to use, therefore battery is needed by calculating electricity under various use environments after manufacture
Can tank discharge curve, to determine the battery, be used to power for low power dissipation electron equipment.But do not have commercially similar
Instrument can realize this function, it is therefore desirable to a kind of controllable dry cell discharge curve measuring circuit be developed, to fill a hole in the market.
Utility model content
The purpose of this utility model is intended at least solve one of described technological deficiency.
For this reason, a purpose of the utility model is to propose a kind of controllable dry cell discharge curve measuring circuit, lead to
Setting test electric current is crossed, VA characteristic curve of the tested battery under each setting electric current is drawn using the circuit, utilizes volt-ampere
Characteristic curve, so as to select the battery with optimal performance for being adapted to use.
To achieve these goals, the embodiment of the utility model one side provides a kind of controllable dry cell discharge curve
Measuring circuit, including control module, MCU processors, ammeter, tested battery；The tested anode connection ammeter
One end, the other end link control module of the ammeter；The control module include constant current source chip, divider resistance unit,
Test resistance unit；The input pin of test resistance unit one end connection constant current source chip, other end connection ammeter
The other end, one end of the control pin connection divider resistance unit of the constant current source chip；The divider resistance unit it is another
End, the enable pin of constant current source chip connect first voltage source respectively, and the ground pin connection of the constant current source chip is tested electricity
The anode in pond；The other end of the ammeter connects MCU processors, the MCU processors with the input pin of constant current source chip
Output terminal connection host computer.
Preferably, the constant current source chip uses the adjustable constant-flow source chip of model MAX1916EZT.
Preferably, the control pin of divider resistance unit one end connection constant current source chip, the first electricity of other end connection
Potential source.
Further, the divider resistance unit includes multiple fixed value resistances and at least one adjustable resistance；It is each described fixed
Value resistance and each adjustable resistance are sequentially connected in series.
Preferably, the MCU processors use the processor chips of model STC15W408AS.
Preferably, the tested battery includes the dry cell and dry cell batteries that voltage is no more than 5V.
Preferably, it is connected between the power input pin of the MCU processors and ground pin by filter unit；Filter
Ripple unit includes the first filter capacitor and the second filter capacitor；First filter capacitor is in parallel with the second filter capacitor.
The controllable dry cell discharge curve measuring circuit provided according to the utility model embodiment, can power transformation by adjusting
Resistance is now harmonious with constant current source chip carries out the setting of test electric current, realizes and battery volt-ampere spy is tested under various discharge currents
The purpose of linearity curve；Test result record is sent to host computer by MCU processors, can accurately calculate and show volt-ampere spy
Linearity curve, so that tester selects the suitable battery of performance, prevents selection excess capacity battery from causing the wasting of resources；This circuit
It is simple in structure, easy to operate, cost is low, can realize the test of battery multi-parameter, be widely used, filled up the market vacancy.
The aspect and advantage that the utility model adds will be set forth in part in the description, partly by from following description
In become obvious, or recognized by the practice of the utility model.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the utility model will in the description from combination accompanying drawings below to embodiment
Become obvious and be readily appreciated that, wherein：
Fig. 1 is a kind of circuit block for controllable dry cell discharge curve measuring circuit that the utility model embodiment provides
Figure；
Fig. 2 (A) is a kind of control for controllable dry cell discharge curve measuring circuit that the utility model embodiment provides
Module section schematic block circuit diagram；
Fig. 2 (B) is at a kind of MCU for controllable dry cell discharge curve measuring circuit that the utility model embodiment provides
Manage the schematic block circuit diagram of device；
Embodiment
The embodiment of the utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is same or like element.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
A kind of as shown in Figure 1, controllable dry cell discharge curve measuring circuit that the utility model embodiment provides；Including
Control module 1, MCU processors U2, ammeter A, tested battery B1；One end of tested battery B1 cathodes connection ammeter A, electric current
The other end link control module 1 of Table A；Control module 1 includes constant current source chip U1, divider resistance unit 101, test resistance list
Member 102；The input pin LED1-LED3 of 102 one end of test resistance unit connection constant current source chip U1, other end connection ammeter
The other end of A, the control pin SET connection divider resistances unit 101 of constant current source chip U1；The enable pin of constant current source chip U1
The anode of EN connections first voltage source+5V, ground pin GND connection battery B1；The other end and constant current source chip U1 of ammeter A
Input pin connection MCU processors U2, MCU processor U2 output terminal connection host computer 2.
Test resistance unit 102 includes test resistance R1, R2, R3；Each test resistance one end connection ammeter A's is another
End, the other end connect the input pin LED1-LED3 of constant current source chip U1 respectively.
Constant current source chip U2 uses model MAX1916EZT adjustable constant-flow source chips.From chip data handbook：Its
Each maximum output current can reach 60mA in three output terminals (LED1, LED2, LED3), and output current is defeated by SET ends
Enter current control, (every road)=230*ISET per road output current I.
It should be noted that in the present embodiment constant-current source chip model citing, be not limited to the example above, can also be it
His mode, details are not described herein.
As shown in Fig. 2 (A), the control pin SET of 101 one end of divider resistance unit connection constant current source chip U1, the other end
Connect first voltage source+5V.Divider resistance unit includes multiple fixed value resistances and at least one adjustable resistance；Each fixed value resistance
It is sequentially connected in series with each adjustable resistance.Divider resistance unit includes an adjustable resistance RX in the present embodiment, further includes two
Fixed value resistance R4 and resistance R5, resistance R4 one end connection U1 control terminal SET, resistance R4, resistance R5 and adjustable resistance RX according to
Secondary series connection, the end connection+5V voltage sources of adjustable resistance RX.
As shown in Fig. 2 (B), MCU processors use the processor chips of model STC15W408AS.It is to be specifically used to deposit
Storage and the MCU of export data；It is internally integrated ADC the and UART serial communication interfaces on 10,8 tunnel.It should be noted that this
The citing of MCU processor models, is not limited to the example above in embodiment, can also be other modes, details are not described herein.
Tested battery includes dry cell and dry cell batteries that voltage is no more than 5V.The power input pin of MCU processors and
It is connected between ground pin by filter unit；Filter unit includes the first filter capacitor C1 and the second filter capacitor C2；The
One filter capacitor C1 is in parallel with the second filter capacitor C2.
The operation principle of the utility model：
In figure, ISET=(5V-1.215V)/(R4+R5+RX), I (per road)=ISET*230, I (total)=3*I (per road),
In formula unit of resistance be ohm, current unit be ampere；As RX=0, discharge current is maximum, I (per road)=59.996mA, I
(total)=179.989mA；As RX=100K, discharge current is minimum, I (per road)=7.602mA, I (total)=22.807mA；It is logical
The resistance value for overregulating RX can be in 22.807mA to convenient setting discharge current between 179.989mA.
When adjusting RX resistance, setting discharge current, the numerical value of discharge current can be observed by ammeter；RX is adjusted
After suitable, the numerical value of recording ammeter is exactly the setting discharge current value Is of this test.
After setting discharge current value Is, host computer 2 is sent instructions by serial ports to start MCU processors, is timed note
Record；The content of record includes cell voltage VH (magnitude of voltage of the MCU processor ADC pins ADC_bat conversions of Vbat, VH=
ADC_bat*5/1023), VL (magnitude of voltage of the ADC_V1 conversions of V1, VL=ADC_V1*5/1023) and T (corresponding ADC samplings
Time), and record content and be stored in the FLASH inside MCU, ensure that record power down is not lost.
It is exactly that setting electric current electric discharge is complete when finding the display of ammeter less than the setting value that circuit is started to work
Into；The record content inside MCU can be read by serial communication interface, when VH and VL differences are less than behind 10*Is in record
Between the record of section be considered as invalid record because difference can just diminish after R1 resistance upstream overcurrent is less than Is；Effective record number
According to be Y-axis by VH, T be that X-axis draws out line chart by Excel forms, be exactly the battery discharge curve figure under setting electric current.
Variable resistor RX values with bigger, can thus test the battery discharge curve of more low current.Electric discharge is bent
It can reflect effective discharge period of setting electric current and minimum discharge voltage in line chart；If survey battery is new battery, can
To converse the capacity for replanting battery battery under setting electric current, battery capacity=setting electric current * effective discharge periods.
Therefore, using this circuit and above-mentioned principle is combined, is now harmonious progress by adjusting variable resistor and constant current source chip
The setting of electric current is tested, realizes the purpose that the I-V characteristic curve of cell is tested under various discharge currents；Pass through MCU processing
Device sends test result record to host computer, can accurately calculate and show VA characteristic curve, so that tester selects
The suitable battery of performance, prevents selection excess capacity battery from causing the wasting of resources；This circuit structure is simple, easy to operate, cost
Test that is low, can realizing battery multi-parameter, be widely used, and has filled up the market vacancy.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
State and may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
Combined in an appropriate manner in any one or more embodiments or example.
Although the embodiment of the utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to the limitation to the utility model is interpreted as, those of ordinary skill in the art are not departing from the utility model
Principle and objective in the case of above-described embodiment can be changed in the scope of the utility model, change, replace and
Modification.The scope of the utility model is by appended claims and its equivalent limits.
Claims (7)
- A kind of 1. controllable dry cell discharge curve measuring circuit；It is characterised in that it includes control module, MCU processors, electric current Table, tested battery；One end of the tested anode connection ammeter, the other end link control module of the ammeter； The control module includes constant current source chip, divider resistance unit, test resistance unit；Test resistance unit one end connection The input pin of constant current source chip, the other end connect the other end of ammeter, the control pin connection point of the constant current source chip One end of piezoresistance unit；The other end of the divider resistance unit, the enable pin of constant current source chip connect the first electricity respectively Potential source, the ground pin connection of the constant current source chip are tested the anode of battery；The other end and constant current source core of the ammeter The input pin connection MCU processors of piece, the output terminal connection host computer of the MCU processors.
- 2. controllable dry cell discharge curve measuring circuit according to claim 1, it is characterised in that the constant current source core Piece uses the adjustable constant-flow source chip of model MAX1916EZT.
- 3. controllable dry cell discharge curve measuring circuit according to claim 1, it is characterised in that the divider resistance Unit one end connects the control pin of constant current source chip, other end connection first voltage source.
- 4. controllable dry cell discharge curve measuring circuit according to claim 3, it is characterised in that the divider resistance Unit includes multiple fixed value resistances and at least one adjustable resistance；Each fixed value resistance and each adjustable resistance are gone here and there successively Connection.
- 5. controllable dry cell discharge curve measuring circuit according to claim 1, it is characterised in that the MCU processing Device uses the processor chips of model STC15W408AS.
- 6. controllable dry cell discharge curve measuring circuit according to claim 1, it is characterised in that the tested battery It is no more than the dry cell and dry cell batteries of 5V including voltage.
- 7. controllable dry cell discharge curve measuring circuit according to claim 1, it is characterised in that the MCU processing It is connected between the power input pin and ground pin of device by filter unit；Filter unit includes the first filter capacitor and the Two filter capacitors；First filter capacitor is in parallel with the second filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201721261284.5U CN207318677U (en) | 2017-09-28 | 2017-09-28 | Controllable dry cell discharge curve measuring circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721261284.5U CN207318677U (en) | 2017-09-28 | 2017-09-28 | Controllable dry cell discharge curve measuring circuit |
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| CN207318677U true CN207318677U (en) | 2018-05-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444748A (en) * | 2018-11-21 | 2019-03-08 | 华立科技股份有限公司 | Battery current and current power dissipation test macro |
| CN110275115A (en) * | 2019-07-24 | 2019-09-24 | 振德医疗用品股份有限公司 | Disposable battery detection method of quantity of electricity |
-
2017
- 2017-09-28 CN CN201721261284.5U patent/CN207318677U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444748A (en) * | 2018-11-21 | 2019-03-08 | 华立科技股份有限公司 | Battery current and current power dissipation test macro |
| CN110275115A (en) * | 2019-07-24 | 2019-09-24 | 振德医疗用品股份有限公司 | Disposable battery detection method of quantity of electricity |
| CN110275115B (en) * | 2019-07-24 | 2021-02-05 | 振德医疗用品股份有限公司 | Method for detecting electric quantity of disposable battery |
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