CN108594133A - A kind of lithium battery pressure differential detection circuit - Google Patents
A kind of lithium battery pressure differential detection circuit Download PDFInfo
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- CN108594133A CN108594133A CN201810478133.8A CN201810478133A CN108594133A CN 108594133 A CN108594133 A CN 108594133A CN 201810478133 A CN201810478133 A CN 201810478133A CN 108594133 A CN108594133 A CN 108594133A
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- lithium battery
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- pressure differential
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Abstract
A kind of lithium battery pressure differential detection circuit, including two ports, further include connection two detection branch between two ports, and each detection branch includes the first diode connected in sequence, detection resistance, the second diode；First diode cathode and the second diode cathode are separately connected current-limiting resistance both ends, and the first diode cathode and the second diode cathode are separately connected different port；Further include signal output branch, the signal output branch includes operational amplifier, the analog-digital converter that input terminal is connect with operational amplifier output terminal and the digital signal processing device being connect with analog-digital converter signal；The anode of the first diode is connected with each other in different detection branch, and the cathode of the second diode is connected with each other in different detection branch.Using lithium battery pressure differential detection circuit of the present invention, required number of devices is few, at low cost, the lithium battery voltage detection under reversal connection state may be implemented, while can also detect the cathode voltage pressure difference of different lithium batteries.
Description
Technical field
The invention belongs to electronic technology fields, are related to a kind of voltage detection device, and in particular to a kind of lithium battery pressure difference inspection
Slowdown monitoring circuit.
Background technology
Voltage detecting is one of necessary detection project of various DC power supplies, when lithium battery is tested, for percentage of batteries electricity
Pole, positive and negative anodes appearance is similar with position, is easy to cause reversal connection, causes test equipment to damage or test result is meaningless, existing skill
It can only alarm when reversal connection occurring in art, the circuit structure for adapting to reversal connection detection is complicated, needs to use ADC and operation amplifier
The combinations such as device, device for power switching, cost are higher.
Invention content
To overcome technological deficiency of the existing technology, the invention discloses a kind of lithium battery pressure differential detection circuits.
Lithium battery pressure differential detection circuit of the present invention, including two test sides, further include be connected in parallel on two test sides it
Between two detection branch, each detection branch include the first diode, the second diode connection between the two diodes
The cathode of detection resistance, the first diode cathode and the second diode is separately connected the both ends of detection resistance；Two detection branch
Diode connect direction on the contrary, further including operational amplifier, the detection resistance both ends of two detection branch are put with operation respectively
Two input terminals connection of big device, the comparator output terminal are connected with analog-digital converter.
Preferably, further include over-pressed isolation circuit, the overvoltage isolation circuit includes being connected between two test sides
Over-pressed detection branch, the overvoltage detection branch include two Zener diodes and the current limliting being connected between Zener diode electricity
Resistance, Zener diode are connect with anode with current-limiting resistance, cathode connecting detection end, and the overvoltage isolation circuit further includes connection
Silicon-controlled device between two test sides and two detection branch, the control terminal of the silicon-controlled device are separately connected current limliting
The different ends of resistance, the silicon-controlled device anode connecting detection end.
Further, the current-limiting resistance resistance value is not less than 100 Europe.
Preferably, the operational amplifier is LMV321.
Preferably, the analog-digital converter is ADS54R463.
Using lithium battery pressure differential detection circuit of the present invention, required number of devices is few, at low cost, may be implemented anti-
The lithium battery voltage detection under state is connect, while the cathode voltage pressure difference of different lithium batteries can also be detected.
Description of the drawings
Fig. 1 is a kind of specific implementation mode schematic diagram of lithium battery pressure differential detection circuit of the present invention,
Reference numeral is entitled in figure：The ports P-, the first diodes of TD1-, the second diodes of TD2-, TR- detection resistances, AMP-
Operational amplifier, ADC- analog-digital converters, DSP- digital signal processing devices, K- switches,
Fig. 2 is a kind of specific implementation mode schematic diagram of shielding system of the present invention, and reference numeral is entitled in figure：P1-
One end, P2- second ends, R1- current-limiting resistances, the first divider resistances of R2-, the second divider resistances of R3-, R4- reset resistors, tri- poles T-
It manages, trombone slide under N-, D1- zener diodes, D2- light emitting diodes, C- capacitances.
Specific implementation mode
Below in conjunction with the accompanying drawings, the specific implementation mode of the present invention is described in further detail.
Lithium battery pressure differential detection circuit of the present invention, including two test side P, further include be connected in parallel on two test sides it
Between two detection branch, each detection branch including the first diode D1, the second diode D2 be connected to two diodes it
Between detection resistance R2, the cathode of the first diode cathode and the second diode is separately connected the both ends of detection resistance；Two inspections
The diode connection direction of branch is surveyed on the contrary, further including operational amplifier A MP, the detection resistance both ends difference of two detection branch
It is connect with two input terminals of operational amplifier, the comparator output terminal is connected with analog-digital converter ADC.
In use, assuming that the detection above Fig. 1 terminates anode, the detection of lower section terminates battery cathode, then operation is put
Detection branch diode cathode on the right side of big device connects anode, which is connected, in the detection resistance of the branch road
There is electric current to flow through, pressure drop is generated at resistance both ends, operational amplifier will export analog voltage after voltage signal detection amplification,
It is converted into digital signal by analog-digital converter and carries out subsequent processing to microcontroller or digital signal processing device；Diode it is upper
Forward conduction voltage about 0.1V, it should be noted that considering the forward loss of two diodes in the data handling procedure after measurement.At this time
Branch on the left of operational amplifier is ended due to the reversal of diode, and each detection branch is set using two terminating diode of resistance
Meter is voltage crosstalk in order to prevent, if without the diode-isolated at resistance both ends, the voltage of another cut-off branch can be to fortune
Amplifier in voltage is calculated to interfere；The LMV321 of TI companies may be used in operational amplifier, is suitble to lower direct current
Pressure detection, analog-digital converter can select the single channel analog-digital converter ADS54R463 of TI companies.
To prevent lithium battery abnormal performance, output voltage is excessively high to damage the accurate devices such as operational amplifier, Fig. 1 institutes
Further include over-pressed isolation circuit in the specific implementation mode shown, which has bilateral construction ability, overvoltage isolation
Circuit includes the over-pressed detection branch being connected between two test sides, and the overvoltage detection branch includes two Zener diodes
The ZD and current-limiting resistance R1 being connected between Zener diode, Zener diode are connect with anode with current-limiting resistance, and cathode connects
Test side is connect, the overvoltage isolation circuit further includes the silicon-controlled device being connected between two test sides and two detection branch
The control terminal of D3, the silicon-controlled device are separately connected the different ends of current-limiting resistance, the silicon-controlled device anode connecting detection
End.Silicon-controlled device controls normally when terminal voltage is low level, when the voltage between two test sides is more than two pole of Zener
When the voltage limiting value of pipe, Zener diode is breakdown, is increased close to the voltage of high pressure test side on current-limiting resistance, makes to detect with high pressure
The silicon-controlled device at end is closed, and to realize high_voltage isolation, current-limiting resistance resistance value should be not less than 100 ohm, to prevent lithium battery
Short circuit causes lithium battery to damage after breakdown.
Using lithium battery pressure differential detection circuit of the present invention, for test side connection electrode polarity no requirement (NR),
Battery powered performance detection is completed, failure is detected caused by avoiding reverse polarity connection.
The present invention is input to applied to external signal at signal or power interface in internal electronic equipment, and first end is usual
For external signal input terminals or external power input, second end is usually signal receiving end or power end, connects internal circuit
Signal end is powered for internal circuit.
Have counnter attack connection function when plug-in unit of the present invention is as power interface, by taking specific implementation mode shown in Fig. 1 as an example,
First end P1 connections positive input under normal circumstances, the NPN pipe forward conductions of diode connection；When first end P1 misconnections
When cathode, second end is generally zero potential, and transistor base voltage is less than emitter voltage at this time, and triode is not turned on, to
Reversal connection is avoided to connect internal circuit.
The plug-in unit is also equipped with Surge suppression function, and transistor base connect second by the positive PN junction between collector
P2 is held, and second end P2 is zero by pull down resistor string current potential normal condition, transistor base maintains low level, as first end P1
When connection anode, it is necessary first to charge to capacitance C, charging current is limited by current-limiting resistance R1, and capacitance voltage slowly rises, just
Stage beginning transistor base voltage is less than turn-on threshold voltage, and triode is not turned on, with the rising of capacitance voltage, triode by
It is progressive enter amplification region and conducting state.Capacitance can a reset resistor in parallel, which can accelerate base stage electricity when power-off
Pressure zero, and divided with current-limiting resistance to adjust base voltage dc point.
It is also equipped with over-voltage suppression function in second end, may be surge voltage in the overpressure situation of second end, it is also possible to
Input voltage is excessively high to be caused, and the second terminal voltage is divided and controlled by the resistance string that the first divider resistance and the second divider resistance form
The lower trombone slide of system adjusts the pressure point of crossing of the ratio control second end of two divider resistances, such as it is 1 that lower trombone slide, which opens saturation voltage,
Volt, the first divider resistance and the second partial pressure resistance ratio 9：1, then when the second terminal voltage is higher than 10V, lower trombone slide is opened, NPN pipes
Base voltage is pulled low, and NPN pipes are closed, and to close surge voltage source and input voltage to the channel of output voltage, are reached
The rapid purpose for dragging down the second terminal voltage.Two divider resistance resistance values are answered larger, are reduced the power consumption on partial pressure branch road, can be seen
Go out, which also has surge voltage further preventive effect.In the present invention, pull down resistor string be also equipped with for
First end over-voltage protecting function provides the function of diode drop-down ground connection；In addition pull down resistor series winding be connected on second end and ground wire it
Between, elimination effect is also functioned to for the electrostatic of second end, second end can not possibly accumulate electrostatic, electrostatic damage will not occur.Drop-down
The faster NPN pipes of opening speed preferably may be used in pipe.
The present invention also has overvoltage protection and warning function in first end, due to first end opposite second end more often in contact with
Forward voltage, misconnection high pressure probability higher；When first end misconnection high pressure, zener diode is breakdown, and light emitting diode forward direction is logical
Cross the second divider resistance earth-continuity, luminous alarm while LEDs ON.
Light emitting diode is connected between drop-down pipe control terminal and zener diode anode, has also been isolated from pull down resistor string
To the forward conduction channel between zener diode, the second terminal voltage is avoided to have an impact first end.In addition zener diode,
Light emitting diode and the second divider resistance are connected between first end and ground wire, and also functioning to elimination for the electrostatic of first end makees
With first end can not possibly accumulate electrostatic, and electrostatic damage will not occur.
Using lithium battery pressure differential detection circuit of the present invention, required number of devices is few, at low cost, may be implemented anti-
The lithium battery voltage detection under state is connect, while the cathode voltage pressure difference of different lithium batteries can also be detected.
Previously described each preferred embodiment for the present invention, if the preferred embodiment in each preferred embodiment
It is not apparent contradictory or premised on a certain preferred embodiment, each preferred embodiment can arbitrary stack combinations
Use, the design parameter in the embodiment and embodiment merely to clearly state the invention verification process of inventor, and
It is non-to limit the scope of patent protection of the present invention, scope of patent protection of the invention is still subject to its claims, all
It is equivalent structure variation made by the specification and accompanying drawing content with the present invention, similarly should be included in the protection model of the present invention
In enclosing.
Claims (6)
1. a kind of lithium battery pressure differential detection circuit, including two ports, which is characterized in that further include connecting between two ports
Two detection branch, each detection branch includes the first diode connected in sequence, detection resistance, the second diode；
First diode cathode and the second diode cathode are separately connected current-limiting resistance both ends, the first diode cathode and the two or two pole
Pipe anode is separately connected different port；
Further include signal output branch, the signal output branch includes operational amplifier, and input terminal is exported with operational amplifier
The digital signal processing device held the analog-digital converter of connection and connect with analog-digital converter signal；First in different detection branch
The anode of diode is connected with each other, and the cathode of the second diode is connected with each other in different detection branch；The operational amplifier
Two input terminals are separately connected the cathode of any first diode cathode and the second diode.
2. lithium battery pressure differential detection circuit as described in claim 1, which is characterized in that the current-limiting resistance resistance value is not less than
1000 Europe.
3. lithium battery pressure differential detection circuit as described in claim 1, which is characterized in that the DSP is.
4. lithium battery pressure differential detection circuit as described in claim 1, which is characterized in that further include being connected to port and to be detected
Shielding system between battery；The shielding system includes the triode of connection between the first end and a second end, three pole
The collector of pipe connects first end, and emitter connects second end；Current-limiting resistance, three pole are connected between base stage and collector
It is connected with capacitance between the base stage and ground of pipe；
Lower trombone slide is connected between the transistor base and ground, the control terminal of the lower trombone slide is connect with control circuit；It is described
Control circuit includes the divider resistance string being connected between second end and ground, the intermediate node connection drop-down of the divider resistance string
Pipe control terminal, the control circuit further include concatenated zener diode and light emitting diode, the zener diode it is positive and negative
Pole is separately connected first end and light emitting diode anode, and light emitting diode cathode connects the control terminal of the lower trombone slide, under described
Trombone slide is NPN pipes or NMOS tube；The first end and second end is respectively the electrode of battery to be detected and the port.
5. lithium battery pressure differential detection circuit as claimed in claim 4, which is characterized in that the capacitance is also parallel with reset electricity
Resistance.
6. lithium battery pressure differential detection circuit as claimed in claim 4, which is characterized in that the triode is managed for NPN.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810478133.8A CN108594133A (en) | 2018-05-18 | 2018-05-18 | A kind of lithium battery pressure differential detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810478133.8A CN108594133A (en) | 2018-05-18 | 2018-05-18 | A kind of lithium battery pressure differential detection circuit |
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| CN108594133A true CN108594133A (en) | 2018-09-28 |
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| CN201810478133.8A Pending CN108594133A (en) | 2018-05-18 | 2018-05-18 | A kind of lithium battery pressure differential detection circuit |
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| CN109683098A (en) * | 2018-12-19 | 2019-04-26 | 上海琪埔维半导体有限公司 | A kind of current detecting system for electrokinetic cell system |
| CN116718935A (en) * | 2023-08-08 | 2023-09-08 | 成都爱旗科技有限公司 | Battery detection device and battery detection method |
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Application publication date: 20180928 |