CN207265706U - A kind of battery protecting circuit - Google Patents
A kind of battery protecting circuit Download PDFInfo
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- CN207265706U CN207265706U CN201721220162.1U CN201721220162U CN207265706U CN 207265706 U CN207265706 U CN 207265706U CN 201721220162 U CN201721220162 U CN 201721220162U CN 207265706 U CN207265706 U CN 207265706U
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Abstract
The utility model belongs to electronic technology field, there is provided a kind of battery protecting circuit, including ON-OFF control circuit and current foldback circuit, the output terminal of the current foldback circuit are connected with the controlled end of the ON-OFF control circuit, and current foldback circuit includes：Reference voltage module, Voltage to current transducer module, voltage transformation module, voltage comparison unit and voltage trim unit, by the voltage reference block of current foldback circuit reference voltage is provided for current foldback circuit, the first voltage of input carried out by voltage trimming module to be converted to comparison voltage, by voltage comparison module by comparison voltage compared with second voltage, then according to comparative result output control signal, the break-make of controlling switch control circuit, it can realize Zero-cross comparator, also effectively the charging current of circuit can be detected when component is lacked of proper care, and then it is the shut-off of controlling switch control circuit to exceed charge threshold in charging current, realize overcurrent protection function.
Description
Technical field
The utility model belongs to electronic technology field, more particularly to a kind of battery protecting circuit.
Background technology
With the extension of battery applications function, the capacity of battery increases therewith, for large capacity battery need use compared with
Big charging current charges battery, to accelerate charging rate, reduces the charging interval.But use larger charging current
Charge to battery, the problem of overcurrent easily occur, therefore, how to realize in the case where charging current is larger to battery into
The problem of row charging overcurrent protection is urgent need to resolve.Battery would generally be protected using battery protecting circuit, specifically, logical
The current foldback circuit for crossing battery protecting circuit carries out battery charging overcurrent protection, and existing current foldback circuit, easily goes out
The situation of existing component mismatch, and component mismatch then can cause current foldback circuit not examined exactly to charging current
Survey, thus cause current foldback circuit effectively to be protected to battery, and the protection threshold of existing current foldback circuit
Threshold voltage is understood variation with temperature and is changed, and causes current foldback circuit effectively to be protected to battery.
In conclusion existing battery protecting circuit exists since component mismatch causes current foldback circuit effective
The problem of battery is protected on ground.
Utility model content
The purpose of this utility model is to provide a kind of battery protecting circuit, it is intended to solves existing battery protecting circuit and exists
The problem of causing current foldback circuit effectively to be protected to battery due to component mismatch.
The utility model provides a kind of battery protecting circuit, including ON-OFF control circuit and current foldback circuit, described
The output terminal of current foldback circuit is connected with the controlled end of the ON-OFF control circuit, the current foldback circuit output control letter
Number to the ON-OFF control circuit, to control the break-make of the ON-OFF control circuit, it is characterised in that the current foldback circuit
Including：Reference voltage module, Voltage to current transducer module, voltage transformation module, voltage comparison unit and voltage trim unit；
Wherein, the cathode of the power end of the reference voltage module and battery connects, the output of the reference voltage module
End is connected with the input terminal of the Voltage to current transducer module, and output terminal and the voltage of the Voltage to current transducer module turn
The input terminal connection of block is changed the mold, the output terminal of the voltage transformation module is connected with the output terminal of the voltage trimming module, institute
The input terminal for stating voltage trimming module is the input terminal of the current foldback circuit, and the input terminal of the voltage trimming module inputs
First voltage, the output terminal of the voltage trimming module and the first input end of voltage comparison module connect, and the voltage compares
The second input terminal input second voltage of module, the output terminal of the voltage comparison module is the output of the current foldback circuit
End；
The reference voltage module, for providing the reference voltage of zero-temperature coefficient for the current foldback circuit；
The Voltage to current transducer module, for the reference voltage to be converted to reference current；
The voltage transformation module, for node voltage to be converted to tertiary voltage, the tertiary voltage for positive voltage and
The tertiary voltage is more than the power conserving voltage.
The voltage trimming module, for the first voltage to be converted to comparison voltage, and the comparison voltage is passed
To send to the voltage comparison unit and carry out voltage comparison, the first voltage is negative voltage, and the comparison voltage is negative voltage, and
The first voltage is less than the comparison voltage；
The voltage comparison module, for by the comparison voltage compared with the second voltage, and according to comparing
As a result output control signal.
Battery protecting circuit provided by the utility model, the voltage reference block by current foldback circuit are overcurrent protection
Circuit provides reference voltage, carries out the first voltage of input being converted to comparison voltage by voltage trimming module, passes through voltage
Comparison module by comparison voltage compared with second voltage, then according to comparative result output control signal, controlling switch control
The break-make of circuit processed, can realize Zero-cross comparator, when component is lacked of proper care also can effectively to the charging current of circuit into
Row detection, and then it is the shut-off of controlling switch control circuit to exceed charge threshold in charging current, realizes overcurrent protection function.Effectively
Ground solves existing battery protecting circuit and exists since component mismatch causes current foldback circuit cannot be effectively to battery
The problem of being protected.
Brief description of the drawings
Fig. 1 is a kind of function structure chart for battery protecting circuit that the utility model embodiment provides；
Fig. 2 is a kind of circuit structure diagram for battery protecting circuit that the utility model first embodiment provides.
Embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only explaining
The utility model, is not used to limit the utility model.
It should be noted that term " comprising " in the specification and claims of the utility model and they are any
Deformation, it is intended that cover non-exclusive include.Such as process, method or system comprising series of steps or unit, product
Or equipment the step of being not limited to list or unit, but the step of not listing or unit are alternatively further included, or can
Selection of land is further included for the intrinsic other steps of these processes, method, product or equipment or unit.In addition, term " first ",
" second " and " the 3rd " etc. are to be used to distinguish different objects, not for description particular order.
The utility model embodiment exists since component mismatch causes overcurrent to solve existing battery protecting circuit
The problem of protection circuit effectively cannot protect battery, there is provided a kind of battery protecting circuit, passes through overcurrent protection electricity
The voltage reference block on road provides reference voltage for current foldback circuit, by voltage trimming module by the first voltage of input into
Row be converted to comparison voltage, by voltage comparison module by comparison voltage with second voltage compared with, then according to compare tie
Fruit output control signal, the break-make of controlling switch control circuit, can realize Zero-cross comparator, also can when component is lacked of proper care
Effectively the charging current of circuit is detected, and then it is that controlling switch control circuit is closed to exceed charge threshold in charging current
It is disconnected, realize overcurrent protection function.
In order to illustrate technical solution described in the utility model, illustrated below by specific embodiment.
Fig. 1 shows the structure of battery protecting circuit 10 provided in this embodiment, as shown in Figure 1, battery protecting circuit 10
Including：Including ON-OFF control circuit 11 and current foldback circuit 12, the output terminal and ON-OFF control circuit of current foldback circuit 12
11 controlled end connection, current foldback circuit 12 outputs control signals to ON-OFF control circuit 11, with controlling switch control circuit
11 break-make, current foldback circuit 12 include：Reference voltage module 121, Voltage to current transducer module 122, voltage transformation module
123, voltage comparison unit 124 and voltage trim unit 125.
Wherein, the cathode of the power end of reference voltage module 121 and battery connects, the output terminal of reference voltage module 121
It is connected with the input terminal of Voltage to current transducer module 122, the output terminal and voltage transformation module of Voltage to current transducer module 122
123 input terminal connection, the output terminal of voltage transformation module 123 are connected with the output terminal of voltage trimming module 125, and voltage trims
The input terminal of module 125 is the input terminal of current foldback circuit 12, and the input terminal of voltage trimming module 125 inputs first voltage
CS, the output terminal of voltage trimming module 125 are connected with the first input end of voltage comparison module 124, voltage comparison module 124
Second input terminal inputs second voltage VSS, and the output terminal of voltage comparison module 125 is the output terminal of current foldback circuit 12.
Reference voltage module 121 is used for the reference voltage that zero-temperature coefficient is provided for current foldback circuit.
Voltage to current transducer module 122 is used to reference voltage being converted to reference current.
Voltage transformation module 123 is used to node voltage being converted to tertiary voltage, and tertiary voltage is positive voltage and the 3rd electricity
Pressure is more than node voltage.
Voltage trimming module 124 is used to first voltage being converted to comparison voltage, and comparison voltage is sent to voltage ratio
Voltage comparison is carried out compared with unit, first voltage is negative voltage, and comparison voltage is negative voltage, and first voltage is less than comparison voltage.
Voltage comparison module 125 is used for by comparison voltage compared with second voltage, and is exported and controlled according to comparative result
Signal processed.
In a particular application, the reference voltage module 121 of current foldback circuit provides zero-temperature coefficient for current foldback circuit 12
Coefficient reference voltage Vbg, is equivalent to equivalent resistance Rb inside above-mentioned Voltage to current transducer module 122, reference voltage is through overvoltage
Branch current Ix, Ix=Vbg/Rb are produced after current conversion module.The first voltage of the input terminal input of voltage trimming module 125
CS is the negative power end of external charger, and in charging process, first voltage CS is negative voltage, and first voltage CS is repaiied through overvoltage
Comparison voltage is exported after mode transfer block 125 and is given to voltage comparison unit 124, comparison voltage is equally also negative voltage, and voltage is more single
Comparison voltage and second voltage VSS are compared by member, wherein, second voltage VSS is 0V, when comparison voltage and second voltage
When difference is more than predetermined voltage threshold, illustrate that electric current is excessive in charging circuit, that is, over current fault occur, voltage comparison unit can be defeated
Going out a control signal and be given to ON-OFF control circuit 11, controlling switch control circuit 11 turns off, and then stops the charging to battery,
Realize overcurrent protection.
In a particular application, above-mentioned battery protecting circuit further includes logic control circuit, which is arranged on
Between above-mentioned current foldback circuit 12 and ON-OFF control circuit 11, control that logic control circuit is exported according to current foldback circuit 12
The break-make of Signal-controlled switch control circuit 11 processed.
In a particular application, above-mentioned battery protecting circuit is protects the internal circuit of chip, by protecting chip to realize electricity
Pond charge protection.
Fig. 2 shows the circuit structure for the battery protecting circuit that the utility model embodiment provides, for convenience of description, only
Show with the relevant part of the utility model embodiment, details are as follows：
As shown in Fig. 2, the embodiment as the utility model, voltage transformation module 123 include：
The controlled end of switching tube N1, switching tube N1 are connected with the first end of switching tube N1, and the first end of switching tube N1 is electricity
The input terminal of modular converter 123 is pressed, the second end of switching tube N1 is the output terminal of voltage transformation module 123.
In one embodiment, above-mentioned switching tube N1 is NMOS tube, and the grid of NMOS tube is the controlled end of switching tube N1, NMOS
The drain electrode of pipe is the first end of switching tube N1, and the source electrode of NMOS tube is the second end of switching tube N1.
In a particular application, above-mentioned switching tube N1 is the NMOS tube with diode connection mode.
In a particular application, above-mentioned switching tube N1 is isolated form metal-oxide-semiconductor.It should be noted that above-mentioned switching tube N1 also may be used
With using the device with similar equivalent diode connection mode.
As an embodiment of the utility model, voltage trimming module 125 includes：First resistor R1 and second resistance R2.
The first end of first resistor R1 be voltage trimming module 125 input terminal, the second end of first resistor R1 and second
The first end connection of resistance R2, the second end of second resistance R2 are the output terminal of voltage trimming module 125.
In a particular application, above-mentioned first resistor R1 is adjustable resistance.By adjusting first resistor R1 resistance value to protection
The scope and precision of threshold voltage carry out trimming control.
As an embodiment of the utility model, voltage comparison module 124 includes：Voltage comparator COMP.
The noninverting input of voltage comparator COMP be voltage comparison module 124 the second input terminal, voltage comparator
The reverse input end of COMP is the first input end of voltage comparison module 124, and the output terminal of voltage comparator COMP is voltage ratio
Compared with the output terminal of module 124.
In a particular application, above-mentioned voltage comparator COMP is zero passage voltage comparator.
The operation principle of battery protecting circuit provided in this embodiment is described as follows below in conjunction with Fig. 2：
Reference voltage module 121 provides the reference voltage of zero-temperature coefficient, i.e. reference voltage Vbg, Voltage to current transducer mould
Equivalent resistance Rb is equivalent to inside block 122, thus obtains branch current Ix=Vbg/Rb, the use two of voltage transformation module 123
The NMOS tube of pole pipe connection mode, a gate source voltage Vgs is raised by node voltage Vg, (node voltage Vg close to 0V), and then
Improve the precision of branch current Ix.The noninverting input access second voltage of the voltage comparator COMP of voltage comparator module
VSS, second voltage VSS=0V, that is, input common mode voltage is fixed near 0V, realize zero passage detection, voltage trims mould
The output terminal of block 125 is connected to the reverse input end IN of voltage comparator COMP, output terminal access first voltage CS.Charging
Cheng Zhong, first voltage are negative voltage, and first voltage passes to the reverse input end of voltage comparator by voltage trimming module 125
IN, and the in-phase input end compared is fixed as VSS=0V.When charging current is larger, the voltage of first voltage CS is relatively negative to be caused
Comparison voltage is less than 0V, and zero passage voltage comparator is overturn, output control signal (high level), controlling switch control unit 11
Turn off and then stop charging.Overcurrent protection threshold voltage VCIP, threshold voltage VCIP=-Ix* (R2+R1), and Ix=Vbg/Rb,
So VCIP=- (R2+R1)/Rb*Vbg.So by the way that the resistance value of first resistor R1 is trimmed just can be by overcurrent protection
The occurrence and precision of threshold voltage VCIP is adjusted to required scope.Overcurrent protection will not be caused by even if component mismatch occur
Circuit can not work normally.In addition, overcurrent protection threshold voltage VCIP almost has similar temperature system with reference voltage Vbg
Number, the fluctuation of the value of overcurrent protection threshold voltage VCIP in -40 DEG C~85 excursion of wide temperature is with respect to being very small
, it thereby may be ensured that the high accuracy of interior overcurrent protection threshold voltage is enclosed in the change of wide temperature model.
The battery protecting circuit that the utility model embodiment provides, was by the voltage reference block of current foldback circuit
Stream protection circuit provides reference voltage, carries out the first voltage of input being converted to comparison voltage by voltage trimming module, leads to
Overvoltage comparison module compared with second voltage, then according to comparative result output control signal, controls comparison voltage
The break-make of ON-OFF control circuit, can realize Zero-cross comparator, charging that also can effectively to circuit when component is lacked of proper care
Electric current is detected, and then it is the shut-off of controlling switch control circuit to exceed charge threshold in charging current, realizes overcurrent protection work(
Energy.Existing battery protecting circuit is efficiently solved to exist since component mismatch causes current foldback circuit cannot be effectively
The problem of being protected to battery.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (9)
1. a kind of battery protecting circuit, including ON-OFF control circuit and current foldback circuit, the output of the current foldback circuit
End is connected with the controlled end of the ON-OFF control circuit, and the current foldback circuit outputs control signals to the switch control electricity
Road, to control the break-make of the ON-OFF control circuit, it is characterised in that the current foldback circuit includes：Reference voltage module,
Voltage to current transducer module, voltage transformation module, voltage comparison unit and voltage trim unit；
Wherein, the cathode of the power end of the reference voltage module and battery connect, the output terminal of the reference voltage module with
The input terminal connection of the Voltage to current transducer module, the output terminal of the Voltage to current transducer module and the voltage conversion mould
The input terminal connection of block, the output terminal of the voltage transformation module are connected with the output terminal of the voltage trimming module, the electricity
The input terminal for pressing trimming module is the input terminal of the current foldback circuit, and the input terminal of the voltage trimming module inputs first
Voltage, the output terminal of the voltage trimming module and the first input end of voltage comparison module connect, the voltage comparison module
The second input terminal input second voltage, the output terminal of the voltage comparison module is the output terminal of the current foldback circuit；
The reference voltage module, for providing the reference voltage of zero-temperature coefficient for the current foldback circuit；
The Voltage to current transducer module, for the reference voltage to be converted to reference current；
The voltage transformation module, for node voltage to be converted to tertiary voltage, the tertiary voltage is positive voltage and described
Tertiary voltage is more than the node voltage.
The voltage trimming module, for the first voltage to be converted to comparison voltage, and the comparison voltage is sent to
The voltage comparison unit carries out voltage comparison, and the first voltage is negative voltage, and the comparison voltage is negative voltage, and described
First voltage is less than the comparison voltage；
The voltage comparison module, for by the comparison voltage compared with the second voltage, and according to comparative result
Output control signal.
2. battery protecting circuit according to claim 1, it is characterised in that the voltage transformation module includes：
Switching tube, the controlled end of the switching tube are connected with the first end of the switching tube, and the first end of the switching tube is institute
The input terminal of voltage transformation module is stated, the second end of the switching tube is the output terminal of the voltage transformation module.
3. battery protecting circuit according to claim 1, it is characterised in that the voltage trimming module includes：
First resistor and second resistance；
The first end of the first resistor be the voltage trimming module input terminal, the second end of the first resistor with it is described
The first end connection of second resistance, the second end of the second resistance are the output terminal of the voltage trimming module.
4. battery protecting circuit according to claim 1, it is characterised in that the voltage comparison module includes：Voltage ratio
Compared with device；
The noninverting input of the voltage comparator is the second input terminal of the voltage comparison module, the voltage comparator
Reverse input end is the first input end of the voltage comparison module, and the output terminal of the voltage comparator compares for the voltage
The output terminal of module.
5. battery protecting circuit according to claim 2, it is characterised in that the switching tube is NMOS tube；
The grid of the NMOS tube is the controlled end of the switching tube, and the drain electrode of the NMOS tube is the first of the switching tube
End, the source electrode of the NMOS tube are the second end of the switching tube.
6. battery protecting circuit according to claim 2, it is characterised in that the switching tube is with diode connection side
The NMOS tube of formula.
7. battery protecting circuit according to claim 2, it is characterised in that the switching tube is isolated form metal-oxide-semiconductor.
8. battery protecting circuit according to claim 3, it is characterised in that the first resistor is adjustable resistance.
9. battery protecting circuit according to claim 4, it is characterised in that the voltage comparator compares for zero passage voltage
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721220162.1U CN207265706U (en) | 2017-09-21 | 2017-09-21 | A kind of battery protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721220162.1U CN207265706U (en) | 2017-09-21 | 2017-09-21 | A kind of battery protecting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207265706U true CN207265706U (en) | 2018-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721220162.1U Active CN207265706U (en) | 2017-09-21 | 2017-09-21 | A kind of battery protecting circuit |
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| CN (1) | CN207265706U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672325A (en) * | 2019-01-22 | 2019-04-23 | 西安拓尔微电子有限责任公司 | A kind of quantifiable anti-charge is counter to fill load switching circuit |
| CN112670959A (en) * | 2021-01-21 | 2021-04-16 | 苏州赛芯电子科技股份有限公司 | Lithium battery protection circuit |
| CN112737055A (en) * | 2021-01-13 | 2021-04-30 | 南昌嘉信高科技有限公司 | Charging protection circuit and electronic equipment |
| CN112821497A (en) * | 2021-01-21 | 2021-05-18 | 苏州赛芯电子科技股份有限公司 | Lithium battery protection system and lithium battery |
| CN117644784A (en) * | 2023-11-30 | 2024-03-05 | 东莞市港奇电子有限公司 | Single-phase alternating-current charging overcurrent protection circuit and charger using same |
-
2017
- 2017-09-21 CN CN201721220162.1U patent/CN207265706U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672325A (en) * | 2019-01-22 | 2019-04-23 | 西安拓尔微电子有限责任公司 | A kind of quantifiable anti-charge is counter to fill load switching circuit |
| CN112737055A (en) * | 2021-01-13 | 2021-04-30 | 南昌嘉信高科技有限公司 | Charging protection circuit and electronic equipment |
| CN112670959A (en) * | 2021-01-21 | 2021-04-16 | 苏州赛芯电子科技股份有限公司 | Lithium battery protection circuit |
| CN112821497A (en) * | 2021-01-21 | 2021-05-18 | 苏州赛芯电子科技股份有限公司 | Lithium battery protection system and lithium battery |
| CN117644784A (en) * | 2023-11-30 | 2024-03-05 | 东莞市港奇电子有限公司 | Single-phase alternating-current charging overcurrent protection circuit and charger using same |
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