CN107248725A - A kind of battery protecting circuit and system - Google Patents
A kind of battery protecting circuit and system Download PDFInfo
- Publication number
- CN107248725A CN107248725A CN201710329162.3A CN201710329162A CN107248725A CN 107248725 A CN107248725 A CN 107248725A CN 201710329162 A CN201710329162 A CN 201710329162A CN 107248725 A CN107248725 A CN 107248725A
- Authority
- CN
- China
- Prior art keywords
- circuit
- discharge
- voltage
- control
- overdischarge detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
This application provides a kind of battery protecting circuit and system, including：Offset-type overdischarge detection circuit, average sample circuit and control circuit；Offset-type overdischarge detection circuit is connected with control circuit, average sample circuit respectively；Average sample circuit is used to gather discharge current；When offset-type overdischarge detection electric circuit inspection battery core voltage is less than overdischarge detection voltage threshold, control circuit cuts off discharge control switch by exporting discharge control signal；Overdischarge detection voltage threshold is negatively correlated with discharge current.The application can be with finer control battery discharge, it is to avoid power-off suddenly.
Description
Technical field
The application is related to power-supply battery technical field, more particularly to a kind of battery protecting circuit and system.
Background technology
At present, various electric cars are becoming increasingly popular, for example：Electric swing car, electrodynamic balance car etc., general these are electronic
Car is all powered using lithium battery, upward slope operation is there may be when in use, now motor needs souping up to be climbed,
Battery discharge current is caused to sharply increase；However, battery core has larger equivalent internal resistance, battery core output voltage is caused to decline, sternly
Cause battery core output voltage to be less than the overvoltage discharge prevention threshold value of conventional batteries protection circuit during weight, enter battery protecting circuit
Enter overvoltage discharge prevention state, forbid output current, unexpected power-off occurs in the system that shows as.Also pacify in general electrodynamic balance car
Balance assist system is filled, to help user to be balanced, it is to avoid user throws from electric car.
But above-mentioned unexpected power-off may cause system blackout, such balance assist system can not also work, and cause to use
The situation that person may throw from electric car.Need to be improved at present, to improve the customer experience effect of user.
The content of the invention
The embodiment of the present application proposes a kind of battery protecting circuit and system, and to solve in the prior art, power-off may suddenly
The technical problem for causing system blackout and then causing user to be thrown from electric car.
One side, the embodiment of the present application provides a kind of battery protecting circuit, including：Offset-type overdischarge detection electricity
Road, average sample circuit AVR and control circuit；Offset-type overdischarge detection circuit respectively with the control circuit, average
Sample circuit AVR is connected；The average sample circuit AVR is used to gather discharge current；
When offset-type overdischarge detection electric circuit inspection battery core voltage is less than overdischarge detection voltage threshold, the control circuit
Discharge control switch MD is cut off by exporting discharge control signal DO1；The overdischarge detection voltage threshold is born with discharge current
It is related.
Second aspect, the embodiment of the present application provides a kind of battery protection system, including above-mentioned battery protecting circuit, puts
Electric control switch MD, charging control switch MC, battery core and current sampling resistor Ri；The offset-type overdischarge detection circuit and institute
Battery core positive pole, battery core negative pole is stated to be connected；The average sample circuit AVR is connected with the first end of the current sampling resistor Ri,
The second end of the current sampling resistor Ri is connected with battery core negative pole；It is described control circuit respectively with discharge control switch MD, fill
Electric control switch MC is connected, and described discharge control switch MD one end is connected with charging control switch MC, the other end and the electric current
Sampling resistor Ri first end is connected.
Have the beneficial effect that：
Traditional overdischarge detection circuit uses constant overdischarge detection threshold value, is provided by the embodiment of the present application
Battery protecting circuit and system, offset-type overdischarge detection circuit, the overdischarge are changed to by existing overdischarge detection circuit
Protection voltage threshold can reduce with the increase of discharge current, utilize the overdischarge detection voltage threshold and battery core after compensation
Voltage ratio is compared with, can be by mistake in the case where discharge current is sharply increased so as to finer control battery discharge
Discharge prevention voltage threshold is compensated so that over threshold value reduces, it is ensured that battery core voltage is not less than overdischarge guarantor
Protect voltage threshold, it is to avoid the situation that battery protecting circuit enters over state and powered off suddenly, and then reduce user
The possibility thrown from electric car.
Brief description of the drawings
The specific embodiment of the application is described below with reference to accompanying drawings, wherein：
Fig. 1 shows the structural representation one of battery protecting circuit in the embodiment of the present application；
Fig. 2 shows the structural representation two of battery protecting circuit in the embodiment of the present application；
Fig. 3 shows the structural representation one of offset-type overdischarge detection circuit in the embodiment of the present application；
Fig. 4 shows the structural representation two of offset-type overdischarge detection circuit in the embodiment of the present application.
Embodiment
In order that the technical scheme and advantage of the application are more clearly understood, below in conjunction with accompanying drawing to the exemplary of the application
Embodiment is described in more detail, it is clear that described embodiment is only a part of embodiment of the application, rather than
The exhaustion of all embodiments.And in the case where not conflicting, the feature in embodiment and embodiment in this explanation can be mutual
It is combined.
In view of the shortcomings of the prior art, the embodiment of the present application proposes a kind of battery protecting circuit and system, carries out below
Explanation.
Fig. 1 shows the structural representation one of battery protecting circuit in the embodiment of the present application, as illustrated, the battery is protected
Protection circuit (structure division in Fig. 1 dotted line frames) can include：Offset-type overdischarge detects circuit and control circuit；The compensation
Type overdischarge detection circuit is connected with the control circuit, average sample circuit AVR respectively；The average sample circuit AVR is used
In collection discharge current；
When offset-type overdischarge detection electric circuit inspection battery core voltage is less than overdischarge detection voltage threshold, the control circuit
Discharge control switch MD is cut off by exporting discharge control signal DO1；The overdischarge detection voltage threshold is born with discharge current
It is related.
By the battery protecting circuit that the embodiment of the present application is provided, existing overdischarge detection circuit is changed to offset-type
Overdischarge detects circuit, and the over voltage threshold can reduce with the increase of discharge current, after compensation
Overdischarge detection voltage threshold and battery core voltage ratio compared with so as to finer control battery discharge, it is to avoid power-off suddenly
Situation, and then reduce the possibility thrown from electric car of user.
Fig. 2 shows the structural representation two of battery protecting circuit in the embodiment of the present application, as illustrated, the battery is protected
Protection circuit (structure division in Fig. 2 dotted line frames) may further include：Power detection circuit is overcharged, it is described to overcharge power detection circuit
One end is connected with the control circuit other end that is connected with battery core positive pole；The electro-detection electric circuit inspection battery core voltage that overcharges exceedes
During default overcharge detection voltage threshold, the control circuit is opened by exporting charging control signal CO1 cut-outs charge control
Close MC.
In implementation, the battery protecting circuit may further include：Charge over-current detection circuit, the charging excessively stream inspection
Circuit is connected, the other end is connected with the first end of the current sampling resistor Ri with the control for slowdown monitoring circuit one end；The charging
When over-current detection circuit detects that the voltage drop on the current sampling resistor Ri is less than default charging over-current detection voltage threshold,
The control circuit cuts off charging control switch MC by exporting charging control signal CO1.
In implementation, the battery protecting circuit may further include：Discharge over-current detection circuit, the electric discharge excessively stream inspection
Circuit is connected, the other end is connected with the first end of the current sampling resistor Ri with the control for slowdown monitoring circuit one end；The electric discharge
It is described when over-current detection circuit detects that the voltage drop on the current sampling resistor Ri is more than default electric discharge over-current detection threshold value
Control circuit cuts off discharge control switch MD by exporting discharge control signal DO1.
In implementation, the discharge control switch MD and charging control switch MC can be NMOS tube, the control of discharge
The grid of the grid and the charging control switch MC that switch MD is connected with the control circuit, the discharge control switch MD
Drain electrode be connected with the drain electrode of the charging control switch MC, the source electrode of the discharge control switch MD and current sample electricity
The first end for hindering Ri is connected, and the source electrode of the charging control switch MC is connected with voltage detecting end VM.
In implementation, the sampled voltage that the offset-type overdischarge detection circuit can be obtained based on average sample circuit AVR
VIA determines which rank that the size of present discharge electric current is in multiple electric discharge ranks, and selectes electric discharge rank correspondence
Overdischarge detection voltage threshold, wherein each electric discharge rank correspondence one overdischarge detection voltage threshold；Rank of discharging is higher,
Overdischarge detection voltage threshold is smaller, and electric discharge rank is higher, and discharge current is bigger.
In implementation, the offset-type overdischarge detection circuit can include：First comparator Comp1, the second comparator
Comp2 and selector Mux2, the first input end of the first comparator Comp1 is connected with the average sample circuit AVR, institute
The output end for stating first comparator Comp1 is connected with the control end of the selector Mux2, the output end of the selector Mux2
It is connected with the second input of the second comparator Comp2, the first input end and battery core of the second comparator Comp2 are just
Extremely it is connected, the output end of the second comparator Comp2 is connected with the control circuit；
When the input voltage of the first input end is higher than predeterminated voltage, the first comparator Comp1 outputs first
Control signal, the selector Mux2 exports the first overdischarge detection voltage threshold according to first control signal；
When the input voltage of the first input end is less than predeterminated voltage, the first comparator Comp1 outputs second
Control signal, the selector Mux2 exports the second overdischarge detection voltage threshold according to second control signal；
The first overdischarge detection voltage threshold is less than the second overdischarge detection voltage threshold.
The embodiment of the present application can be compensated, made by the way of segmented compensation to overdischarge detection voltage threshold
Overdischarge detection voltage threshold is obtained according to the change of discharge current to be changed.
Fig. 3 shows the structural representation one of offset-type overdischarge detection circuit in the embodiment of the present application, as illustrated, this
Application embodiment is illustrated so that two-part is compensated as an example.
Those skilled in the art can also set multisection type to compensate according to actual needs, and multisection type compensation is only needed to will be default
Voltage be set to it is multiple (for example：VITH1, VITH2, VITH3) and equally set the overdischarge detection voltage threshold in selector
It is set to multiple：
When the input voltage of first input end is less than the first predeterminated voltage VITH1, comparator Comp101 outputs first are controlled
Signal, the selector Mux2 exports the first overdischarge detection voltage threshold according to first control signal；
When the input voltage of first input end is higher than the first predeterminated voltage VITH1 and is less than the second predeterminated voltage VITH2, than
The input voltage is exported to comparator Comp102 compared with device Comp101, and comparator Comp102 exports the second control signal, described
Selector Mux2 exports the second overdischarge detection voltage threshold according to second control signal；
When the input voltage of first input end is higher than the second predeterminated voltage VITH2 and is less than the 3rd predeterminated voltage VITH3, than
Compared with the device Comp101 outputs input voltage to comparator Comp102, the comparator Comp102 exports the 3rd control signal,
The selector Mux2 exports the 3rd overdischarge detection voltage threshold according to the 3rd control signal；
When the input voltage of first input end is higher than the 3rd predeterminated voltage VITH3, comparator Comp101 exports the input
Voltage is to comparator Comp102, and comparator Comp102 exports the input voltage to comparator Comp103, the comparator
Comp103 exports the 4th control signal, and the selector Mux2 exports the 4th overdischarge according to the 4th control signal and detected
Voltage threshold；
…
By that analogy.
Using aforesaid way, the quantity of default overdischarge detection voltage threshold compares first comparator in selector Mux2
Default magnitude of voltage quantity is at least more one in Comp1.
Those skilled in the art can also realize the purpose of multisection type compensation using other modes, and the application is not limited this
System.
In order to avoid battery protecting circuit is by noise jamming, the embodiment of the present application can also be implemented in the following way.
In implementation, the first comparator Comp1 and/or the second comparator Comp2 can be delayed comparator.
In the embodiment of the present application, comparator Comp1, Comp2 can be delayed comparator, thus be avoided that dry by noise
Disturb.
Fig. 4 shows the structural representation two of offset-type overdischarge detection circuit in the embodiment of the present application, as illustrated, institute
Stating offset-type overdischarge detection circuit includes：Multiplier, subtracter and the 3rd comparator Comp3, the input of multiplier one
It is connected with the average sample circuit AVR, the output end of the multiplier is connected with the input of the subtracter, the described 3rd
Comparator Comp3 first input end is connected with the output end of the subtracter, the second input is connected with the battery core positive pole,
Output end is connected with the control circuit；
The multiplier is according to the average sample circuit AVR voltages inputted and preset voltage value output compensation reference voltage
Vci, the subtracter is detected according to predetermined reference voltage VOD with the overdischarge after the compensation reference voltage Vci output compensation
Voltage threshold Vodci, the 3rd comparator Comp3 battery core voltage VDD and the overdischarge detection voltage threshold
Vodci output control signals.
The embodiment of the present application can be compensated by the way of continous way compensation to the overdischarge detection voltage threshold,
So that overdischarge detection voltage threshold continuously changes with the change of discharge current.
In implementation, the preset voltage value can be predetermined resistance value Rp and current sampling resistor Ri ratio.
Based on same inventive concept, the embodiment of the present application additionally provides a kind of battery protection system, including above-mentioned battery is protected
Protection circuit, discharge control switch MD, charging control switch MC, battery core and current sampling resistor Ri；The offset-type overdischarge inspection
Slowdown monitoring circuit is connected with the battery core positive pole, battery core negative pole；The of the average sample circuit AVR and the current sampling resistor Ri
One end is connected, and the second end of the current sampling resistor Ri is connected with battery core negative pole；It is described control circuit respectively with control of discharge
Switch MD, charging control switch MC be connected, described discharge control switch MD one end is connected with charging control switch MC, the other end and
The first end of the current sampling resistor Ri is connected.
Whole circuit structure shown in Fig. 2, Fig. 3 is the structure for the battery protection system that the embodiment of the present application is provided
Schematic diagram.
For the ease of the implementation of the application, illustrated below with example.
Fig. 2 is the structural representation of the embodiment of the present application, as illustrated, can include：Overcharge power detection circuit, offset-type
Overdischarge detection circuit, charging over-current detection circuit, electric discharge over-current detection circuit, average sample circuit AVR, control circuit,
Nmos switch MD, MC, battery core, current sampling resistor Ri.
Power detection circuit is overcharged, whether detection battery core voltage (i.e. voltage between VDD and G) exceedes overcharge detection threshold
Value, if it does, by controlling circuit to control CO1 to be low level, cutting off charging control switch MC, charging is forbidden so as to realize
Function.
Charge over-current detection circuit, by the voltage drop (i.e. the voltage difference of A points and G points) on detection resistance Ri, when less than
During the over-current detection threshold value that charges, by controlling circuit to control CO1 to be low level, charging control switch MC is cut off, so as to realize taboo
The function of only charging.
Discharge over-current detection circuit, by the voltage drop (i.e. the voltage difference of A points and G points) on detection resistance Ri, when more than
During over-current detection threshold value of discharging, by controlling circuit to control DO1 to be low level, discharge control switch MD is cut off, so as to realize taboo
The function of only discharging.
These functions (overcharging electro-detection, charging over-current detection, electric discharge over-current detection) are like the prior art.Offset-type mistake
Discharge detection circuit is different with prior art.
Traditional overdischarge detection circuit uses constant overdischarge detection threshold value.Offset-type overdischarge is detected in the present invention
Circuit uses the threshold voltage changed with discharge current.
Can specifically there are two kinds of implementations：
1) segmented is compensated；
2) continous way is compensated.
Whether offset-type overdischarge detection electric circuit inspection battery core voltage (i.e. voltage between VDD and G) is less than overdischarge inspection
Threshold value is surveyed, if less than the overdischarge detection threshold value after compensation, by controlling circuit to control DO1 to be low level, cut-out charging control
System switch MD, so as to realize the function of forbidding electric discharge.
Fig. 3 shows the structural representation of segmented compensation, as illustrated, can include：Comparator Comp1, comparator
Comp2, selector Mux2.
(show that discharge current is larger) when VIA voltages are higher than VITH, output signal OC1 is high level, control selections
Device output is equal to VODL (relatively low electric discharge overdischarge detection threshold value)；
(show that discharge current is smaller) when VIA voltages are less than VITH, output signal OC1 is low level, control selections
Device output is equal to VODH (higher electric discharge overdischarge detection threshold value).
In a preferred embodiment, it can be segmented more carefully, for example, divide three sections or divide more multistage finely to compensate.
In another preferred embodiment, comparator Comp1, Comp2 in Fig. 3 can be delayed comparator,
It thus is avoided that by noise jamming.
Fig. 4 shows the structural representation of continous way compensation, as illustrated, can include：Multiplier, subtracter, compare
Device Comp2.
VIA signals are multiplied by the ratio of (Rp/Ri), produce compensation reference voltage Vci；
Fixed reference potential VOD subtracts the overdischarge detection threshold value Vodci that Vci voltages produce compensation；
Comparator compares vdd voltage and Vodci, produces overdischarge detection signal OD.
When vdd voltage is less than Vodci voltages, OD signals are low level, are shown to be battery core overdischarge.
Although having been described for the preferred embodiment of the application, those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the application scope.
Claims (11)
1. a kind of battery protecting circuit, it is characterised in that including：Offset-type overdischarge detection circuit, average sample circuit AVR and
Control circuit；The offset-type overdischarge detection circuit is connected with the control circuit, average sample circuit AVR respectively；It is described
Average sample circuit AVR is used to gather discharge current；
When offset-type overdischarge detection electric circuit inspection battery core voltage is less than overdischarge detection voltage threshold, the control circuit passes through
Export discharge control signal DO1 cut-out discharge control switches MD；The overdischarge detection voltage threshold is negatively correlated with discharge current.
2. battery protecting circuit as claimed in claim 1, it is characterised in that further comprise：Power detection circuit is overcharged, it is described
Electro-detection circuit on one side is overcharged with the control circuit other end that is connected with battery core positive pole to be connected；It is described to overcharge power detection circuit inspection
When surveying battery core voltage more than default overcharge detection voltage threshold, the control circuit is by exporting charging control signal CO1
Cut off charging control switch MC.
3. battery protecting circuit as claimed in claim 1, it is characterised in that further comprise：Charge over-current detection circuit, institute
State charging over-current detection circuit one end be connected with the control circuit, the other end and the current sampling resistor Ri first end phase
Even；The charging over-current detection circuit detects that the voltage drop on the current sampling resistor Ri is less than default charging over-current detection
During voltage threshold, the control circuit cuts off charging control switch MC by exporting charging control signal CO1.
4. battery protecting circuit as claimed in claim 1, it is characterised in that further comprise：Discharge over-current detection circuit, institute
State electric discharge over-current detection circuit one end be connected with the control circuit, the other end and the current sampling resistor Ri first end phase
Even；The electric discharge over-current detection circuit detects that the voltage drop on the current sampling resistor Ri is more than default electric discharge over-current detection
During threshold value, the control circuit cuts off discharge control switch MD by exporting discharge control signal DO1.
5. circuit protection circuit as claimed in claim 1, it is characterised in that the discharge control switch MD and charge control are opened
It is NMOS tube to close MC, the grid of the discharge control switch MD and charging control switch MC grid with the control
Circuit is connected, and the drain electrode of the discharge control switch MD is connected with the drain electrode of the charging control switch MC, the control of discharge
Switch MD source electrode is connected with the first end of the current sampling resistor Ri, and source electrode and the voltage of the charging control switch MC are examined
End VM is surveyed to be connected.
6. battery protecting circuit as claimed in claim 1, it is characterised in that the offset-type overdischarge detection circuit is based on flat
Which that the size of present discharge electric current is in multiple electric discharge ranks the sampled voltage VIA that equal sample circuit AVR is obtained determine
Individual rank, and the corresponding overdischarge detection voltage threshold of the electric discharge rank is selected, wherein each one mistake of electric discharge rank correspondence is put
Electro-detection voltage threshold；Rank of discharging is higher, and overdischarge detection voltage threshold is smaller, and electric discharge rank is higher, and discharge current is bigger.
7. the battery protecting circuit as described in claim 1 or 6, it is characterised in that the offset-type overdischarge detects circuit bag
Include：First comparator Comp1, the second comparator Comp2 and selector Mux2, the first comparator Comp1 the first input
End is connected with the average sample circuit AVR, the output end of the first comparator Comp1 and the control of the selector Mux2
End is connected, and the output end of the selector Mux2 is connected with the second input of the second comparator Comp2, second ratio
First input end compared with device Comp2 is connected with battery core positive pole, output end and the control circuit of the second comparator Comp2
It is connected；
When the input voltage of the first input end is higher than predeterminated voltage, the first comparator Comp1 outputs first are controlled
Signal, the selector Mux2 exports the first overdischarge detection voltage threshold according to first control signal；
When the input voltage of the first input end is less than predeterminated voltage, the first comparator Comp1 outputs second are controlled
Signal, the selector Mux2 exports the second overdischarge detection voltage threshold according to second control signal；
The first overdischarge detection voltage threshold is less than the second overdischarge detection voltage threshold.
8. battery protecting circuit as claimed in claim 7, it is characterised in that the ratios of the first comparator Comp1 and/or second
It is delayed comparator compared with device Comp2.
9. battery protecting circuit as claimed in claim 1, it is characterised in that the offset-type overdischarge detection circuit includes：
Multiplier, subtracter and the 3rd comparator Comp3, the input of multiplier one are connected with the average sample circuit AVR, institute
The output end for stating multiplier is connected with the input of the subtracter, the first input end of the 3rd comparator Comp3 and institute
State subtracter output end be connected, the second input be connected with the battery core positive pole, output end with it is described control circuit be connected；
The multiplier is according to the average sample circuit AVR voltages inputted and preset voltage value output compensation reference voltage Vci, institute
State subtracter and voltage threshold is detected with the overdischarge after the compensation reference voltage Vci output compensation according to predetermined reference voltage VOD
Value Vodci, the 3rd comparator Comp3 battery core voltage VDD and the overdischarge detection voltage threshold Vodci is defeated
Go out control signal.
10. battery protecting circuit as claimed in claim 9, it is characterised in that the preset voltage value is predetermined resistance value Rp
With current sampling resistor Ri ratio.
11. a kind of battery protection system, it is characterised in that including the battery protecting circuit as described in claim 1-9 is any, put
Electric control switch MD, charging control switch MC, battery core and current sampling resistor Ri；The offset-type overdischarge detection circuit and institute
Battery core positive pole, battery core negative pole is stated to be connected；The average sample circuit AVR is connected with the first end of the current sampling resistor Ri,
The second end of the current sampling resistor Ri is connected with battery core negative pole；It is described control circuit respectively with discharge control switch MD, fill
Electric control switch MC is connected, and described discharge control switch MD one end is connected with charging control switch MC, the other end and the electric current
Sampling resistor Ri first end is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710329162.3A CN107248725A (en) | 2017-05-11 | 2017-05-11 | A kind of battery protecting circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710329162.3A CN107248725A (en) | 2017-05-11 | 2017-05-11 | A kind of battery protecting circuit and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107248725A true CN107248725A (en) | 2017-10-13 |
Family
ID=60017002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710329162.3A Pending CN107248725A (en) | 2017-05-11 | 2017-05-11 | A kind of battery protecting circuit and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107248725A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193871A (en) * | 2018-11-07 | 2019-01-11 | 广东蚬壳家电有限公司 | Power supply device and fan |
| CN110336346A (en) * | 2019-06-26 | 2019-10-15 | 南京中感微电子有限公司 | Battery protecting circuit with micro-short circuit detection |
| CN113347763A (en) * | 2021-07-29 | 2021-09-03 | 上海裕芯电子科技有限公司 | Chip with functional timing circuit |
| WO2022052684A1 (en) * | 2020-09-09 | 2022-03-17 | 高创(苏州)电子有限公司 | Battery charging/discharging control system and electronic device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2768299Y (en) * | 2004-11-29 | 2006-03-29 | 崇贸科技股份有限公司 | Switching type control device |
| CN101916887A (en) * | 2003-10-14 | 2010-12-15 | 布莱克和戴克公司 | Battery pack |
| CN102368661A (en) * | 2011-01-30 | 2012-03-07 | 杭州士兰微电子股份有限公司 | Switching power supply with function of correcting power factor as well as control device and control method thereof |
| CN104679089A (en) * | 2013-11-26 | 2015-06-03 | 上海贝岭股份有限公司 | Cascade over-temperature compensation and protection system and circuit for integrated LED (light emitting diode) driving chip |
| CN104821555A (en) * | 2015-05-11 | 2015-08-05 | 无锡中星微电子有限公司 | Battery protection circuit capable of sampling current accurately |
| CN105811495A (en) * | 2016-02-26 | 2016-07-27 | 苏州博之盾防护技术有限公司 | Safety protection apparatus of vehicular lithium battery |
-
2017
- 2017-05-11 CN CN201710329162.3A patent/CN107248725A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916887A (en) * | 2003-10-14 | 2010-12-15 | 布莱克和戴克公司 | Battery pack |
| CN2768299Y (en) * | 2004-11-29 | 2006-03-29 | 崇贸科技股份有限公司 | Switching type control device |
| CN102368661A (en) * | 2011-01-30 | 2012-03-07 | 杭州士兰微电子股份有限公司 | Switching power supply with function of correcting power factor as well as control device and control method thereof |
| CN104679089A (en) * | 2013-11-26 | 2015-06-03 | 上海贝岭股份有限公司 | Cascade over-temperature compensation and protection system and circuit for integrated LED (light emitting diode) driving chip |
| CN104821555A (en) * | 2015-05-11 | 2015-08-05 | 无锡中星微电子有限公司 | Battery protection circuit capable of sampling current accurately |
| CN105811495A (en) * | 2016-02-26 | 2016-07-27 | 苏州博之盾防护技术有限公司 | Safety protection apparatus of vehicular lithium battery |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193871A (en) * | 2018-11-07 | 2019-01-11 | 广东蚬壳家电有限公司 | Power supply device and fan |
| CN110336346A (en) * | 2019-06-26 | 2019-10-15 | 南京中感微电子有限公司 | Battery protecting circuit with micro-short circuit detection |
| CN110336346B (en) * | 2019-06-26 | 2021-07-09 | 南京中感微电子有限公司 | Battery protection circuit with micro short circuit detection |
| WO2022052684A1 (en) * | 2020-09-09 | 2022-03-17 | 高创(苏州)电子有限公司 | Battery charging/discharging control system and electronic device |
| CN114243806A (en) * | 2020-09-09 | 2022-03-25 | 高创(苏州)电子有限公司 | Battery charge-discharge control system and electronic equipment |
| CN114243806B (en) * | 2020-09-09 | 2024-05-14 | 高创(苏州)电子有限公司 | Battery charge and discharge control system and electronic equipment |
| CN113347763A (en) * | 2021-07-29 | 2021-09-03 | 上海裕芯电子科技有限公司 | Chip with functional timing circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111463847B (en) | Battery protection chip and battery protection board | |
| CN107248725A (en) | A kind of battery protecting circuit and system | |
| US8264205B2 (en) | Circuit for charge and/or discharge protection in an energy-storage device | |
| JP3468220B2 (en) | Charge / discharge protection circuit, battery pack incorporating the charge / discharge protection circuit, and electronic device using the battery pack | |
| KR101842819B1 (en) | Overvoltage and overcurrent protection circuit and mobile terminal | |
| JP5536044B2 (en) | Device for balancing battery pack having overdischarge prevention function | |
| US7659699B2 (en) | Battery | |
| AU624255B2 (en) | Battery charging system | |
| US8081410B1 (en) | Overcurrent protection circuit | |
| JP3136677B2 (en) | Overcharge and overdischarge prevention circuit for secondary battery | |
| KR101658867B1 (en) | Pre-charging and voltage supply system for a dc-ac inverter | |
| GB2282924A (en) | Charging and discharging circuit for preventing overcharging and overdischarge of rechargable battery pack consisting of a plurality of rechargable cells | |
| JP2007273241A (en) | Lithium battery pack | |
| US5897973A (en) | Lithium cell recharging | |
| CN106026244B (en) | Lithium ion battery charge-discharge protection circuit and lithium-ion battery systems | |
| JP2009089468A (en) | Battery pack | |
| JP2001112182A (en) | Protective circuit for secondary battery | |
| US6297619B1 (en) | Secondary battery cell protection circuit | |
| CN106394305A (en) | Electromobile battery pack capable of being quickly charged and quickly-charging method thereof | |
| WO2013089113A1 (en) | Power storage device and charging/discharging method | |
| CN210792872U (en) | Lithium battery protection circuit is kept apart in charge-discharge | |
| JP2000195560A (en) | Battery pack | |
| JP2012210113A (en) | Charging apparatus | |
| EP1122855A1 (en) | Lithium-ion battery pack chargeable by alkali charger | |
| CN210806771U (en) | Overcharge and overdischarge delay lithium battery protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171013 |
|
| RJ01 | Rejection of invention patent application after publication |