CN207819439U - A kind of battery current-limiting protection circuit - Google Patents
A kind of battery current-limiting protection circuit Download PDFInfo
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- CN207819439U CN207819439U CN201820205540.7U CN201820205540U CN207819439U CN 207819439 U CN207819439 U CN 207819439U CN 201820205540 U CN201820205540 U CN 201820205540U CN 207819439 U CN207819439 U CN 207819439U
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Abstract
The utility model provides a kind of battery current-limiting protection circuit, which includes：With the concatenated current-limiting resistance of battery；Reference voltage generator, for generating reference voltage signal；Difference amplifier connects the current-limiting resistance and the reference voltage generator, and the voltage drop on the current-limiting resistance is carried out differential amplification with the reference voltage signal as input；MOSFET connects the output end of the output end and the difference amplifier of the current-limiting resistance, and the output control based on the difference amplifier flows through the cell output current of current-limiting resistance.The battery current-limiting protection circuit provided by the utility model being made of full discrete component; it can be in lower sampling current-limiting resistance value; equally reach the current sampling signal resolving accuracy that can be only achieved in the past using integrated amplifier and protection circuit control; the safety for increasing protection circuit simultaneously, reaches higher anti-explosion safety protection class.
Description
Technical field
The utility model is related to battery protection technical field, more particularly to a kind of battery current-limiting protection circuit.
Background technology
Existing battery current-limiting protection circuit is usually to be made of integrated amplifier and sample circuit etc., either
The current-limiting protection circuit being made of larger sampling current-limiting resistance.But it is relatively high in requirement of explosion proof grade, and electric current output is compared
When big, foregoing circuit cannot be satisfied requirement of explosion proof.Its defect mainly has：1, such as easily there are puncturing at the failures in integrated circuit itself,
Belong to the non-reliable devices in explosion-proof criteria；2, larger sampling current-limiting resistance is when output current is bigger, circuit effect
Rate is relatively low, and can generate larger heat on sampling current-limiting resistance, higher to the power rating requirements of resistance；Especially exist
It under the malfunctions such as short circuit, can largely generate heat, cause component temperature excessively high, or even the temperature grade beyond antiknock device is wanted
It asks, brings more serious security risk.
Therefore, it is necessary to a kind of explosive-proof grade height, the battery current-limiting protection circuits that fever is small, power-efficient is high.
Utility model content
The purpose of this utility model is to provide a kind of battery current-limiting protection circuits, in same even lower circuit loss
Lower raising explosive-proof grade.
One side according to the present utility model provides a kind of battery current-limiting protection circuit, the battery current-limiting protection circuit
Including：
With the concatenated current-limiting resistance of battery；
Reference voltage generator, for generating reference voltage signal；
Difference amplifier connects the current-limiting resistance and the reference voltage generator, will be on the current-limiting resistance
Voltage drop carries out differential amplification with the reference voltage signal as input；
Mos field effect transistor MOSFET control circuits, connect the output end of the current-limiting resistance
With the output end of the difference amplifier, limit is flowed through to control by controlling MOSFET based on the output of the difference amplifier
The cell output current of leakage resistance.
Preferably, the MOSFET control circuits include：The MOSFET and its driving circuit；MOSFET connections institute
The output end of current-limiting resistance is stated, the driving circuit connects the output end of the difference amplifier, is used to be based on the difference
MOSFET described in the output driving of amplifier.
Preferably, the difference amplifier is the differential circuit that a pair of of triode and a pair of MOSFET are constituted, the reference
Voltage generator is connect with the grid of a MOSFET in the pair of MOSFET, the current-limiting resistance and the pair of MOSFET
In another MOSFET grid connection.
Preferably, the battery current-limiting protection circuit further includes：Switch off control circuit, is used for when battery output electricity
Stream is higher than predetermined value so that when consumption power and/or voltage on the MOSFET constantly increase and is more than predetermined value, turns off institute
State MOSFET.
Preferably, the voltage between the source electrode and drain electrode for sensing the MOSFET that switches off control circuit, in the voltage
When higher than predetermined value, the MOSFET is turned off.
Preferably, the resistance value of the current-limiting resistance is 10m Ω -100m Ω.
Preferably, outputs of the MOSFET based on the difference amplifier, it is defeated to reduce by increasing its conducting resistance
Go out electric current.
Preferably, the element of the battery current-limiting protection circuit is full discrete component.
Battery current-limiting protection circuit and battery protection current-limiting method provided by the utility model are all made of discrete component, compare
In traditional current-limiting protection circuit combined with sampling current-limiting resistance using integrated circuit, current-limiting protection provided by the utility model
Circuit can avoid the defect of integrated circuit itself, reach higher explosive-proof grade.
In the preferred embodiment in the utility model, can using smaller current-limiting resistance in the case of, equally reach with
The preceding current sampling signal resolving accuracy that can be only achieved using integrated amplifier and protection circuit control, while reducing and limiting
Electric power consumption on leakage resistance also reduces the heat of generation under the malfunctions such as short circuit, to increase the peace of protection circuit
Quan Xing reaches higher anti-explosion safety protection class.
It will be understood by those skilled in the art that the above tool can be not limited to objects and advantages of the utility model
Described in body, and the above and other purpose that the utility model can be realized will be more clearly understood according to following detailed description.
In addition, it should be understood that aforementioned description substantially and follow-up description in detail are exemplary illustration and explanation, not
It should be used as the limitation to the claimed content of the utility model.
Description of the drawings
With reference to the attached drawing of accompanying, the more purposes of the utility model, function and advantage will pass through the utility model embodiment party
The described below of formula is illustrated, wherein：
Fig. 1 is the element connection relationship diagram of battery current-limiting protection circuit in the utility model embodiment 1.
Fig. 2 shows the MOSFET and its driving circuit example for exporting control in the utility model embodiment 1.
Fig. 3 is the element connection relationship diagram of battery current-limiting protection circuit in the utility model embodiment 2.
Fig. 4 shows the driving circuit of MOSFET and the example to switch off control circuit in the utility model embodiment 2.
Specific implementation mode
By reference to exemplary embodiment, the purpose of this utility model and function and for realizing these purposes and function
Method will be illustrated.However, the utility model is not limited to exemplary embodiment as disclosed below；It can be by not
It is realized with form.The essence of specification is only to aid in various equivalent modifications Integrated Understanding the utility model
Detail.
Hereinafter, the embodiments of the present invention will be described with reference to the drawings.In the accompanying drawings, identical reference numeral represents
Same or similar component or same or like step.
Here, it should also be noted that, in order to avoid having obscured the utility model because of unnecessary details, in the accompanying drawings
The structure and/or processing step closely related with scheme according to the present utility model are illustrate only, and is omitted and this practicality
The little other details of new relationship.
Embodiment 1
A kind of battery current-limiting protection circuit constituted using full discrete component is provided in the utility model embodiment, to keep away
Exempt from the defect that integrated circuit itself is brought.Fig. 1 is the element connection of battery current-limiting protection circuit in one embodiment of the utility model
Relation schematic diagram.As shown in Figure 1, the battery current-limiting protection circuit includes：Current-limiting resistance Rsense, difference amplifier 12, reference
Voltage generator 13, the MOSFET 15 for carrying out output current control and its driving circuit (not shown in figure 1).
The battery of sampling current-limiting resistance Rsense and circuit input end is connected in series with.
Reference voltage generator 13 is for generating reference voltage (or reference voltage) Vref.Circuit shown in Fig. 1 shows
In intention, reference voltage generator 13 is connected to circuit input end.
Difference amplifier 12 connects current-limiting resistance Rsense and reference voltage generator 13 so that on current-limiting resistance Rsense
The reference voltage signal that generates of voltage drop and reference voltage generator 13 be input to difference amplifier 12 respectively as input
Two input terminals carry out differential amplification.By the comparison of pressure drop and reference voltage on the current-limiting resistance Rsense to input,
When the pressure drop on Rsense is more than reference voltage, the output of difference amplifier 12 can control MOSFET 15 to reduce output current,
It is more than permissible value to prevent electric current.
As an example, as shown in Figure 1, difference amplifier 12 may include the difference that a pair of of triode and a pair of MOSFET are constituted
Dynamic circuit, active loads of two MOSFET as difference amplifier, grid and the reference voltage of one of MOSFET occur
The output of device 13 connects, the grid of another MOSFET by input resistance R360 be connected to current-limiting resistance Rsense and
Between MOSFET15；The reference voltage Vref and current-limiting resistance Rsense that difference amplifier 12 generates reference voltage generator 13
On voltage drop difference amplification, the differential amplification signal of output is for controlling MOSFET15.
In difference amplifier 12 shown in Fig. 1, the end of difference amplifier is heavy current device 14.
For example, the reference voltage that can generate reference voltage generator 13 will be limited as the negative input of difference amplifier 12
Positive input of the voltage drop as difference amplifier 12 on leakage resistance Rsense.When the battery for flowing through current-limiting resistance Rsense exports
Electric current less than setting knee value when, the difference of reference voltage Vref and the voltage drop on current-limiting resistance Rsense be it is negative, i.e., it is just defeated
Enter voltage and be less than negative input voltage, the differential amplification signal driving MOSFET 15 that difference amplifier 12 exports is in fully on
State.When flowing through the cell output current of current-limiting resistance Rsense higher than the knee value set, reference voltage Vref and current limliting
The difference of voltage drop on resistance Rsense is that just, i.e., higher than negative input voltage, (pressure drop on Rsense is more than ginseng to positive input voltage
Examine voltage), at this point, the signal driving MOSFET of difference amplifier output is begun to turn off, to its conducting resistance RDS-ONStart to increase
Add, to reduce the output current for flowing through Rsense, so that the difference of the pressure drop and reference voltage on Rsense is 0, to defeated
Go out electric current and does not exceed Iout：
Iout=Vref/R
In formula, Vref is the reference voltage that reference voltage generator 13 generates, and R is the resistance value of current-limiting resistance.On Rsense
Pressure drop and reference voltage difference be 0 when, MOSFET 15 is also at fully on state.
Fig. 2 shows a connection examples of MOSFET 15 and its driving circuit.MOSFET driving circuits can wrap in Fig. 2
Include triode Q61, resistance R364 and ground resistance R352, wherein the one end resistance R364 be connected to current-limiting resistance Rsense and
Between MOSFET 15, other end connecting triode Q61, resistance R352 are connected between triode Q61 and ground.Difference amplifier
Signal be input to the base stage of triode Q61, and MOSFET 15 is driven by the output of the collector of triode Q61.Fig. 2
Shown in MOSFET driving circuits be only an example, but the utility model is not limited to this, also other circuit forms
The driving to MOSFET 15 equally may be implemented.Certainly, used driving circuit should match with MOSFET, to reach
Correct current limitation effect.
Existing in the battery current-limiting protection circuit of current limliting, the resistance value of current-limiting resistance is sampled using sampling current-limiting resistance
It is general bigger, it is such as hundreds of milliohms even several Europe, causes the power consumed on sampling current-limiting resistance excessive, not only reduce electricity
The efficiency in source also increases fever.And in the utility model embodiment, the resistance value of the sampling current-limiting resistance of use can be very low
(such as 10m Ω -100m Ω), preferably tens of milliohms, this greatly reduces the pressure drop of area loss and power on it；Especially in electricity
Flow it is larger in the case of.
In another embodiment of the utility model, can by reference voltage generator 13 as difference amplifier 12 just
Pole inputs, and is inputted the voltage drop on current-limiting resistance Rsense as the cathode of difference amplifier 12.It at this time only need to be by depletion type
PMOSFET changes depletion type NMOSFET into and current-limiting protection function as above can be realized.
Element in battery current-limiting protection circuit provided in this embodiment is all made of discrete component, compared to traditional use
The current-limiting protection circuit that integrated circuit is combined with sampling current-limiting resistance, current-limiting protection circuit provided by the utility model can avoid
The defect of integrated circuit itself reaches higher explosive-proof grade, and can be using smaller current-limiting resistance, together
Sample reaches the current sampling signal resolving accuracy that can be only achieved in the past using integrated amplifier and protection circuit control, simultaneously
The electric power consumption reduced on current-limiting resistance also reduces the heat of generation under the malfunctions such as short circuit, to increase protection
The safety of circuit reaches higher anti-explosion safety protection class.
Embodiment 2
Fig. 3 show the element connection relationship diagram of battery current-limiting protection circuit in the present embodiment 2.Shown in Fig. 3
In embodiment, other than with whole elements shown in Fig. 1, also has and control electricity for controlling the shutdown of battery feed circuit
Road 16.16 are switched off control circuit for turning off battery feed circuit when cell output current is higher than predetermined value, such as work as battery
Output current is higher than predetermined value so that actual power consumption and/or voltage on MOSFET 15 constantly increase and be more than predetermined value
When, turn off MOSFET 15.
The driving circuit of MOSFET and the example to switch off control circuit in the utility model embodiment 2 are shown in Fig. 4, such as
Shown in Fig. 4, switch off control circuit 16 include triode Q62 and resistance R362, and with the driving circuit of MOSFET share resistance
R352.The drain electrode of MOSFET 15 passes through the base stage of resistance R362 connecting triodes Q62, the source electrode connecting triode of MOSFET 15
The collector of the emitter of Q62, triode Q62 is grounded by resistance R352.15 driving circuits of MOSFET shown in Fig. 4 with
Identical in Fig. 2, therefore not to repeat here.In one example, switch off control circuit between the sources of 16 sense MOSFETs 15, drain electrode
Voltage drop ends MOSFET when the voltage drop between source, drain electrode is more than the value being set as needed, so as to super in electric current
The raised maximum value of temperature that the heating tape for controlling the power of maximum possible when going out, while controlling MOSFET comes, Bu Nengchao
Cross requirement of explosion proof.
MOSFET shown in Fig. 4 switches off control circuit an only example, but the utility model is not limited to this, also
The control of the shutdown to MOSFET 15 equally may be implemented in other circuit forms.
The present embodiment can reach higher anti-explosion safety protection class relative to embodiment 1.
Correspondingly, the utility model also provides a kind of battery current limiting protecting method, and this method will be in using difference amplifier
Voltage drop on the concatenated current-limiting resistance of battery is compared with reference voltage signal, when the voltage drop on current-limiting resistance is more than reference
When voltage signal, difference amplifier is drivingly connected reduces output current in the MOSFET of the output end of current-limiting resistance.
Battery current-limiting protection circuit in the utility model embodiment as above is preferably packaged together with the battery core of battery,
Assembling is known as the battery with current-limiting protection, but the utility model is not limited to this.
Battery current-limiting protection circuit and battery current limliting means of defence in the utility model embodiment are applicable not only to explosion-proof
Battery, while being suitable for non-anti-explosion battery.
In the utility model, for feature embodiment description and/or illustrated, can it is one or more its
It is used in the same manner or in a similar manner in its embodiment, and/or is combined or replaces with the feature of other embodiment
The feature of other embodiment.
Explanation in conjunction with the utility model disclosed here and practice, the other embodiment of the utility model is for this field
Technical staff will be readily apparent and understand.Illustrate and embodiment be regarded only as being exemplary, the utility model it is real
Scope and spirit are defined in the claims.
Claims (8)
1. a kind of battery current-limiting protection circuit, which is characterized in that the battery current-limiting protection circuit includes：
With the concatenated current-limiting resistance of battery；
Reference voltage generator, for generating reference voltage signal；
Difference amplifier connects the current-limiting resistance and the reference voltage generator, by the voltage on the current-limiting resistance
Drop carries out differential amplification with the reference voltage signal as input；
Mos field effect transistor MOSFET control circuits connect output end and the institute of the current-limiting resistance
The output end for stating difference amplifier flows through current limliting electricity by controlling MOSFET based on the output of the difference amplifier to control
The cell output current of resistance.
2. battery current-limiting protection circuit according to claim 1, which is characterized in that the MOSFET control circuits include：
The MOSFET and its driving circuit；
The MOSFET connects the output end of the current-limiting resistance, and the driving circuit connects the output of the difference amplifier
End, is used for MOSFET described in the output driving based on the difference amplifier.
3. battery current-limiting protection circuit according to claim 1, which is characterized in that the difference amplifier is a pair of three poles
MOSFET in the differential circuit that pipe and a pair of MOSFET are constituted, the reference voltage generator and the pair of MOSFET
Grid connects, and the current-limiting resistance is connect with the grid of another MOSFET in the pair of MOSFET.
4. battery current-limiting protection circuit according to claim 1, which is characterized in that the battery current-limiting protection circuit also wraps
It includes：
Switch off control circuit, is used to be higher than predetermined value when the cell output current so that the consumption work(on the MOSFET
When rate and/or voltage constantly increase and is more than predetermined value, the MOSFET is turned off.
5. battery current-limiting protection circuit according to claim 4, which is characterized in that described to switch off control circuit described in sensing
Voltage between the source electrode and drain electrode of MOSFET turns off the MOSFET when the voltage is higher than predetermined value.
6. battery current-limiting protection circuit according to claim 1, which is characterized in that the resistance value of the current-limiting resistance is 10m
Ω-100mΩ。
7. battery current-limiting protection circuit according to claim 1, which is characterized in that the MOSFET is put based on the difference
The output of big device, output current is reduced by increasing its conducting resistance.
8. battery current-limiting protection circuit according to claim 1, which is characterized in that the member of the battery current-limiting protection circuit
Part is full discrete component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820205540.7U CN207819439U (en) | 2018-02-06 | 2018-02-06 | A kind of battery current-limiting protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820205540.7U CN207819439U (en) | 2018-02-06 | 2018-02-06 | A kind of battery current-limiting protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207819439U true CN207819439U (en) | 2018-09-04 |
Family
ID=63319827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820205540.7U Active CN207819439U (en) | 2018-02-06 | 2018-02-06 | A kind of battery current-limiting protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207819439U (en) |
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2018
- 2018-02-06 CN CN201820205540.7U patent/CN207819439U/en active Active
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