CN206533118U - Low pressure cut-off protection circuit - Google Patents
Low pressure cut-off protection circuit Download PDFInfo
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- CN206533118U CN206533118U CN201720259332.0U CN201720259332U CN206533118U CN 206533118 U CN206533118 U CN 206533118U CN 201720259332 U CN201720259332 U CN 201720259332U CN 206533118 U CN206533118 U CN 206533118U
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Abstract
A kind of low pressure cut-off protection circuit, including comparison circuit, comparison circuit includes amplifier, the one end of the in-phase input end of amplifier respectively with 3rd resistor, one end connection of 4th resistance, the other end connection voltage sampling circuit of 3rd resistor, the other end of 4th resistance and the output end of amplifier are connected, the one end of the inverting input of amplifier respectively with the 6th resistance, one end connection of 7th resistance, the other end connection reference voltage of 6th resistance, the other end ground connection of 7th resistance, the base stage connection of triode of the output end of amplifier through the tenth resistance and on-off circuit, the grounded emitter of triode, the grid of the colelctor electrode of triode respectively with metal-oxide-semiconductor, one end connection of 11st resistance, the source electrode of metal-oxide-semiconductor, the other end of 11st resistance is connected with anode, the drain electrode of metal-oxide-semiconductor is connected with voltage output end.The phenomenon for restarting output after battery protection after voltage rise again is which solved, scheduling and planning is more flexible, and device is more saved, and cost is lower.
Description
Technical field
The utility model is related to battery charging and discharging protection field, more particularly to a kind of low pressure cut-off protection circuit.
Background technology
With the increase of battery access times and use time, the capacity of battery constantly declines internal resistance increase.It is especially electric
The overdischarge in pond will cause battery capacity drastically to decline service life shortening, or even cause cell damage.Therefore to battery
Electric discharge is necessary to be protected by.
Common discharge protection circuit is that the voltage of battery is detected in real time, when detecting less than setting voltage,
Just turn off the discharge loop of battery.This circuit is that the electric discharge of battery can be played a protective role in theory, but actually simultaneously
It is far from it.Due to have turned off the discharge loop of battery, cell voltage can go up a bit again, and more than the voltage of setting, so that
Discharge loop is connected again, after connection, and cell voltage occurs again less than setting voltage, then turns off the discharge loop of battery, electricity
Cell voltage gos up again, and discharge loop is connected again, so repeatedly, finally makes less than setting voltage to occur when cell voltage is unloaded
Electric discharge.
Although not resulting in cell damage with this overdischarge, but battery capacity decrease speed can be accelerated, shortening makes
Use the life-span.Especially when protecting, due to the discharge loop of repeatedly on-off load, load equipment will be caused
Very big impact, or even damage load equipment.Also many circuits make battery management system using battery management integrated circuit
Circuit, although good protection can be played to battery, but its circuit is complicated, and function is cumbersome and mutually overlapping, and cost is also higher, wave
Rate is also high.
The content of the invention
The purpose of this utility model be it is corresponding not enough there is provided a kind of low pressure cut-off protection circuit for prior art, its
By rationally setting return difference, the phenomenon for restarting output after battery protection after voltage rise again is solved, and scheduling and planning is cleverer
Living, device is more saved, and cost is lower, can be avoided putting offer protection for lithium battery, lead accumulator, and be extended the service life of battery,
Big power consumption electricity consumption is turned off, the stand-by time of product is improved, with very high practicality.
The purpose of this utility model is realized using following proposal：A kind of low pressure cut-off protection circuit, including voltage are adopted
Sample circuit, comparison circuit, on-off circuit and reference voltage-stabilizing circuit, the reference voltage-stabilizing circuit are used to provide benchmark to comparison circuit
Voltage, the voltage sampling circuit includes being connected on first resistor R1 between anode and ground and second resistance R2, described
Comparison circuit includes amplifier U1, one end, the 4th resistance R4 one end of amplifier U1 in-phase input end respectively with 3rd resistor R3
Connection, the other end of the 3rd resistor R3 is connected between first resistor R1 and second resistance R2, the 4th resistance R4's
The other end is connected with amplifier U1 output end, amplifier U1 inverting input one end respectively with the 6th resistance R6, the 7th resistance
R7 one end connection, the 6th resistance R6 other end connection reference voltage, the 7th resistance R7 other end ground connection, amplifier U1's is defeated
Go out triode Q1 of the end through the tenth resistance R10 and on-off circuit base stage connection, triode Q1 grounded emitter, triode Q1
Colelctor electrode grid respectively with metal-oxide-semiconductor Q2, the 11st resistance R11 one end be connected, metal-oxide-semiconductor Q2 source electrode, the 11st resistance
The R11 other end is connected with anode, and metal-oxide-semiconductor Q2 drain electrode is connected with voltage output end.
The reference voltage-stabilizing circuit includes three end adjustable shunt reference source U3, the sun of the three ends adjustable shunt reference source U3
Pole is grounded, the reference pole of three ends adjustable shunt reference source U3 one end respectively with the 8th resistance R8, the one of the 9th resistance R9
End connection, the 9th resistance R9 other end ground connection, the 8th resistance R8 other end is respectively with three end adjustable shunt reference source U3's
One end connection of negative electrode, the 5th resistance R5, the other end of the 5th resistance R5 is connected with anode, adjustable point of three end
Stream a reference source U3 negative electrode is connected with comparison circuit, for providing reference voltage to comparison circuit.
The one end of this low pressure cut-off protection circuit also including the first electric capacity C1, the first electric capacity C1 connects with anode V1
Connect, the first electric capacity C1 other end ground connection.
This low pressure cut-off protection circuit also includes the second electric capacity C2, the second electric capacity C2 one end and three end adjustable shunt benchmark
Source U3 negative electrode connection, the second electric capacity C2 other end ground connection.First electric capacity C1, the second electric capacity C2 strobe, and allow benchmark
It is stable.
This low pressure cut-off protection circuit also includes the 3rd electric capacity C3, the 3rd electric capacity C3 one end be connected to first resistor R1 with
Between second resistance R2, the 3rd electric capacity C1 other end ground connection.3rd electric capacity C3 is sampling holding capacitor, and end change is compared in reduction
The voltage pulsation caused.
The utility model this have the advantage that：Because the comparison circuit of low pressure cut-off protection circuit of the present utility model includes
One end, the 4th resistance R4 one end of amplifier U1, amplifier U1 in-phase input end respectively with 3rd resistor R3 are connected, and the described 3rd
The resistance R3 other end is connected between first resistor R1 and second resistance R2, the other end and the amplifier U1 of the 4th resistance R4
Output end connection, one end, the 7th resistance R7 one end of amplifier U1 inverting input respectively with the 6th resistance R6 be connected, the
Six resistance R6 other end connection reference voltage, the 7th resistance R7 other end ground connection, amplifier U1 output end is through the tenth resistance
The triode Q1 of R10 and on-off circuit base stage connection.Comparison circuit of the present utility model uses amplifier, and dependable performance is performed
Accurate stable, and by rationally setting return difference, solve the phenomenon for restarting output after battery protection after voltage rise again.
The reference voltage-stabilizing circuit of this low pressure cut-off protection circuit includes three end adjustable shunt reference source U3, and three end is adjustable
Shunt reference source U3 plus earth, the reference pole of the three ends adjustable shunt reference source U3 respectively with the 8th resistance R8 one
End, the 9th resistance R9 one end connection, the 9th resistance R9 other end ground connection, the 8th resistance R8 other end respectively can with three ends
One end connection of shunt reference source U3 negative electrode, the 5th resistance R5 is adjusted, the other end and the anode of the 5th resistance R5 connect
Connect, the negative electrode of the three ends adjustable shunt reference source U3 is connected with comparison circuit, for providing reference voltage to comparison circuit, this
The reference voltage-stabilizing circuit of utility model has used three end adjustable shunt reference sources, therefore reference voltage is precise and stable, debugging setting
Flexibly.
And the low pressure shut-off point of this low pressure cut-off protection circuit is stable, number of ways can be set, can be by setting sampled point
Debugged with benchmark voltage stabilizing point, scheduling and planning is more flexible.
In a word, the utility model can avoid putting offer protection for lithium battery, lead accumulator, extend the use longevity of battery
Life, turns off big power consumption electricity consumption, the stand-by time of product is improved, with very high practicality.And this low pressure cut-off protection circuit device
Part is more saved, and cost is lower, and by rationally setting return difference circuit, turn-off circuit has only used a metal-oxide-semiconductor.
Brief description of the drawings
Fig. 1 is the circuit diagram of low pressure cut-off protection circuit of the present utility model.
Embodiment
Referring to Fig. 1, a kind of low pressure cut-off protection circuit, including voltage sampling circuit, comparison circuit, on-off circuit and benchmark
Mu balanced circuit, the reference voltage-stabilizing circuit is used to provide reference voltage to comparison circuit, and the voltage sampling circuit includes series connection
First resistor R1 and second resistance R2 between anode and ground, the comparison circuit include amplifier U1, and amplifier U1's is same
One end, the 4th resistance R4 one end of phase input respectively with 3rd resistor R3 are connected, and the other end of the 3rd resistor R3 connects
It is connected between first resistor R1 and second resistance R2, the other end of the 4th resistance R4 is connected with amplifier U1 output end, transports
Put one end, the 7th resistance R7 one end of U1 inverting input respectively with the 6th resistance R6 to be connected, the 6th resistance R6's is another
End connection reference voltage, the 7th resistance R7 other end ground connection, amplifier U1 output end is through the tenth resistance R10 and on-off circuit
Triode Q1 base stage connection, triode Q1 grounded emitter, triode Q1 colelctor electrode grid respectively with metal-oxide-semiconductor Q2,
11st resistance R11 one end connection, metal-oxide-semiconductor Q2 source electrode, the 11st resistance R11 other end are connected with anode,
Metal-oxide-semiconductor Q2 drain electrode is connected with voltage output end.
The reference voltage-stabilizing circuit includes three end adjustable shunt reference source U3, the sun of the three ends adjustable shunt reference source U3
Pole is grounded, the reference pole of three ends adjustable shunt reference source U3 one end respectively with the 8th resistance R8, the one of the 9th resistance R9
End connection, the 9th resistance R9 other end ground connection, the 8th resistance R8 other end is respectively with three end adjustable shunt reference source U3's
One end connection of negative electrode, the 5th resistance R5, the other end of the 5th resistance R5 is connected with anode, adjustable point of three end
Stream a reference source U3 negative electrode is connected with comparison circuit, for providing reference voltage to comparison circuit.Amplifier U1 gives it by battery
Supply voltage is provided.
The one end of this low pressure cut-off protection circuit also including the first electric capacity C1, the first electric capacity C1 connects with anode V1
Connect, the first electric capacity C1 other end ground connection.This low pressure cut-off protection circuit also includes the second electric capacity C2, the second electric capacity C2 one end
It is connected with three end adjustable shunt reference source U3 negative electrode, the second electric capacity C2 other end ground connection.First electric capacity C1, the second electric capacity C2
Strobe, allow baseline stability.
This low pressure cut-off protection circuit also includes the 3rd electric capacity C3, the 3rd electric capacity C3 one end be connected to first resistor R1 with
Between second resistance R2, the 3rd electric capacity C1 other end ground connection.3rd electric capacity C3 is sampling holding capacitor, and end change is compared in reduction
The voltage pulsation caused.
Operation principle of the present utility model is：Amplifier U1- is determined by reference voltage partial pressure, is kept constant.When electricity voltage
When sufficient, U1+>U1-, amplifier U1 are output as height, and Q1 conductings drag down PMOS Q2-1, and Q2 conductings, cell voltage is normally defeated
Go out.When cell voltage V1 reductions, U1+ is decreased, and works as U1+<During U1-, amplifier U1 is output as bearing, Q1 cut-offs, PMOS Q2-1
It is driven high, Q2 cut-offs, shut-off output.Cell voltage reduction direction V1 critical point is set as V1A, U1+>U1-, amplifier U1 is defeated
Go out for height, high level and the V1 superpositions of output determine U1+, as U1+=U1-, now V1 voltage is V1A.Setting
Cell voltage rise direction V1 critical point is V1B, U1+<U1-, amplifier U1 are output as low, and the low level of output is superimposed with V1
Effect determines U1+, as U1+=U1-, and now V1 voltage is V1B.Obviously, when the reduction of coefficient U1 output voltages
When, only higher V1 voltages can just make U1+=U1-, so V1B>V1A, V1B and V1A difference are return difference.By adjusting R4
Frequent starting phenomenon can be solved with the size of adjusting return difference.
This low pressure cut-off protection circuit is the battery protection for solar lighting controller, solar lighting controller bag
Include charge management circuit, the first Voltage stabilizing module and the second Voltage stabilizing module, the input and solar panels of the charge management circuit
Output end connection, the output end of charge management circuit is connected with battery, for charging the battery.This low pressure cut-off protection circuit
It is arranged between the output end of battery and the second Voltage stabilizing module.Second Voltage stabilizing module is used to export 5V voltages.First Voltage stabilizing module
For exporting 12V voltages.The input of first Voltage stabilizing module and the output end of solar panels are connected, the output of the first Voltage stabilizing module
The input respectively with 12V voltage outputs interface, the second Voltage stabilizing module is held to be connected, output end and the 5V voltages of the second Voltage stabilizing module
Output interface is connected.Solar lighting controller converts solar energy into electric energy, available for illumination and the charging of electron product.Control
Built-in charge protector, can power when there is the sun directly to light source and electronic product, while battery can also be given in device processed
Charging.When without sunshine, just powered by battery to light source and electronic product, available for travelling, the anti-dangerous disaster relief and fail to lead to
The Poor Mountainous Area illumination of electricity is used, with good market value and social effect.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, it is clear that this area
Technical staff can to the utility model carry out it is various change and modification without departing from spirit and scope of the present utility model.This
Sample, if these modifications and variations of the present utility model belong to the utility model claim and its equivalent technologies scope it
Interior, then the utility model is also intended to comprising including these changes and modification.
Claims (5)
1. a kind of low pressure cut-off protection circuit, it is characterised in that：Including voltage sampling circuit, comparison circuit, on-off circuit and base
Quasi- mu balanced circuit, the reference voltage-stabilizing circuit is used to provide reference voltage to comparison circuit, and the voltage sampling circuit includes string
It is associated in the first resistor between anode and ground（R1）And second resistance（R2）, the comparison circuit include amplifier（U1）, fortune
Put（U1）In-phase input end respectively with 3rd resistor（R3）One end, the 4th resistance（R4）One end connection, it is described 3rd electricity
Resistance（R3）The other end be connected to first resistor（R1）With second resistance（R2）Between, the 4th resistance（R4）The other end with
Amplifier（U1）Output end connection, amplifier（U1）Inverting input respectively with the 6th resistance（R6）One end, the 7th resistance
（R7）One end connection, the 6th resistance（R6）The other end connection reference voltage, the 7th resistance（R7）The other end ground connection, amplifier
（U1）Output end through the tenth resistance（R10）With the triode of on-off circuit（Q1）Base stage connection, triode（Q1）Transmitting
Pole is grounded, triode（Q1）Colelctor electrode respectively with metal-oxide-semiconductor（Q2）Grid, the 11st resistance（R11）One end connection, MOS
Pipe（Q2）Source electrode, the 11st resistance（R11）The other end be connected with anode, metal-oxide-semiconductor（Q2）Drain electrode and voltage it is defeated
Go out end connection.
2. low pressure cut-off protection circuit according to claim 1, it is characterised in that：The reference voltage-stabilizing circuit includes three ends
Adjustable shunt reference source（U3）, three end adjustable shunt reference source（U3）Plus earth, the three ends adjustable shunt benchmark
Source（U3）Reference pole respectively with the 8th resistance（R8）One end, the 9th resistance（R9）One end connection, the 9th resistance（R9）'s
The other end is grounded, the 8th resistance（R8）The other end respectively with three end adjustable shunt reference sources（U3）Negative electrode, the 5th resistance
（R5）One end connection, the 5th resistance（R5）The other end be connected with anode, three end adjustable shunt reference source
（U3）Negative electrode be connected with comparison circuit, for give comparison circuit provide reference voltage.
3. low pressure cut-off protection circuit according to claim 1 or 2, it is characterised in that：Also include the first electric capacity（C1）, institute
State the first electric capacity（C1）One end be connected with anode V1, the first electric capacity（C1）The other end ground connection.
4. low pressure cut-off protection circuit according to claim 2, it is characterised in that：Also include the second electric capacity（C2）, second
Electric capacity（C2）One end and three end adjustable shunt reference sources（U3）Negative electrode connection, the second electric capacity（C2）The other end ground connection.
5. low pressure cut-off protection circuit according to claim 1, it is characterised in that：Also include the 3rd electric capacity（C3）, the 3rd
Electric capacity（C3）One end be connected to first resistor（R1）With second resistance（R2）Between, the 3rd electric capacity（C1）The other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720259332.0U CN206533118U (en) | 2017-03-17 | 2017-03-17 | Low pressure cut-off protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720259332.0U CN206533118U (en) | 2017-03-17 | 2017-03-17 | Low pressure cut-off protection circuit |
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| Publication Number | Publication Date |
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| CN206533118U true CN206533118U (en) | 2017-09-29 |
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ID=59917727
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720259332.0U Active CN206533118U (en) | 2017-03-17 | 2017-03-17 | Low pressure cut-off protection circuit |
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| Country | Link |
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| CN (1) | CN206533118U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947302A (en) * | 2017-12-31 | 2018-04-20 | 重庆海国科技有限公司 | A kind of power circuit of Portable oil filter |
-
2017
- 2017-03-17 CN CN201720259332.0U patent/CN206533118U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947302A (en) * | 2017-12-31 | 2018-04-20 | 重庆海国科技有限公司 | A kind of power circuit of Portable oil filter |
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