CN206820514U - The dead circuit of electric lock on a kind of elimination lithium battery protection circuit - Google Patents
The dead circuit of electric lock on a kind of elimination lithium battery protection circuit Download PDFInfo
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- CN206820514U CN206820514U CN201720665653.0U CN201720665653U CN206820514U CN 206820514 U CN206820514 U CN 206820514U CN 201720665653 U CN201720665653 U CN 201720665653U CN 206820514 U CN206820514 U CN 206820514U
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Abstract
The circuit that electric lock is dead on lithium battery protection circuit is eliminated the utility model proposes a kind of.The protection circuit includes pulse generation circuit and controlled switch; in circuit power up; producing one has the single pulse signal being sometime spaced, for will be disconnected again after the input shorted to earth certain time of the current foldback circuit in circuit or short-circuit protection circuit or current foldback circuit and short-circuit protection circuit.Circuit power up is set to enter fixed original state, the guard mode without entering short-circuit protection or overcurrent protection.Solve lithium battery protection circuit it is upper for the first time electric when cause possibly into can not normal work locking state, avoid lithium battery protection circuit it is upper for the first time electric when need to charge and release locked operation.
Description
Technical field
The utility model belongs to electronic technology field, is related to a kind of semiconductor integrated circuit technology, especially lithium battery and protects
Shield technology.
Background technology
With the popularization of the portable type electronic products such as mobile phone, tablet personal computer, portable power source, lithium battery obtains as electric supply installation
Extensive use is arrived.Lithium battery is because its chemism is more active, during charging and discharging, causes charging voltage too high,
Discharge current is excessive or short-circuit etc., may all cause battery explosion or damage.In order to avoid the generation of above-mentioned abnormal conditions, lithium electricity
Pond is required for protecting it with lithium battery protection circuit in actual applications.
It is used for the circuit of li-ion cell protection in the prior art, by control circuit, two n type field effect transistors and resistance group
Into.Control the turn-on and turn-off of two transistors respectively by li-ion cell protection control circuit.In charging process, if lithium battery
Pressure is higher than protection voltage is overcharged, then the shut-off of li-ion cell protection control circuit control second transistor, turns off charge circuit.Discharged
Cheng Zhong, if lithium battery voltage is less than Cross prevention voltage, the control the first transistor shut-off of li-ion cell protection control circuit, close
Disconnected discharge loop.In discharge process, if discharge current occurs in lithium battery excessive or short-circuit, li-ion cell protection control circuit control
The first transistor shut-off processed, turns off discharge loop.
When li-ion cell protection control circuit accesses lithium battery for the first time, i.e., in li-ion cell protection control circuit power up,
Li-ion cell protection control circuit needs to return to normal operating conditions by Cross prevention in power up, and chip internal is each
Functional module does not settle out also, causes power up to be judged to be broken into excessively stream or short-circuit condition, so that first is brilliant
Body pipe turns off, even if upper electricity is completed, circuit can not also return to normal operating conditions, hence into locking state.Due to this shape
There is uncertainty in state, this is resulted in after lithium battery assembles with control circuit for the first time, it is necessary to fill once electric, guarantee to lithium battery
Every lithium battery all under in release locking state, just can guarantee that lithium battery normal use.
A kind of lithium battery protection circuit is proposed in CN201010581451 and CN201510081613 respectively, by two N
Type field-effect transistor synthesizes a n type field effect transistor, reduces circuit cost, but still electric on lithium battery without solving
The problem of process can make circuit locked.
Utility model content
The purpose of this utility model be to provide it is a kind of eliminate the circuit that electric lock is dead on lithium battery protection circuit, make lithium battery
Protection circuit is automatically moved back to normal mode of operation when electric first.
In order to achieve the above object, solution of the present utility model is：
The dead circuit of electric lock on a kind of elimination lithium battery protection circuit, including pulse generation circuit and controlled switch；Institute
The input for stating pulse generation circuit is connected with the output end of the delay circuit in lithium battery protection circuit, or and lithium battery
The output end of over-discharge protection circuit in protection circuit is connected, or with the output end of over-discharge protection circuit by delay or and its
The signal output obtained after its signal logic computing is connected；The output end of the pulse generation circuit and the controlled switch
Input is connected, and controls the conducting and shut-off of the controlled switch；First output end of the controlled switch is connected to the ground, described
The input of second output end of controlled switch and the short-circuit protection circuit in lithium battery protection circuit and current foldback circuit
Input is connected；During the controlled switch conducting, its first output end connects with the second output end；The controlled switch shut-off
When, its first output end disconnects with the second output end.
The input signal of the pulse generation circuit is the trailing edge or rising edge signal of signal, and output signal is a certain
The high level pulse or low level pulse of time interval, the time interval are that circuit can be made to be returned to just from short-circuit protection state
Normal working condition can make circuit return to time of normal operating conditions from overcurrent protection state.
The controlled switch is that metal oxide semiconductor transistor switch or bipolar transistor switch or diode are opened
Close.
The pulse generation circuit include PMOS M10, NMOS tube M11, NMOS tube M12, NOT gate UA1, NOT gate UA2,
NOT gate UA3, NOT gate UA4, nor gate UB1 and electric capacity C10；The controlled switch includes PNP pipe；The pulse generation circuit
Input NAND gate UA1 input be connected, NOT gate UA1 output end and PMOS M10 grid end, NMOS tube M11 grid
End and NOT gate UA3 input are connected, and PMOS M10 source is connected with positive source, PMOS M10 drain terminal, NMOS
Pipe M11 drain terminal NAND gate UA2 input is connected, and NMOS tube M11 source is connected with NMOS tube M12 drain terminal, NMOS tube
M12 source is connected to the ground, and electric capacity C10 one end NAND gate UA2 input is connected, and the electric capacity C10 other end is connected to the ground,
Nor gate UB1 two inputs distinguish NAND gate UA2 output end, NOT gate UA3 output end is connected, and nor gate UB1's is defeated
Go out to hold NAND gate UA4 input to be connected, NOT gate UA4 output end is the output end of the pulse generation circuit；The list
The output end of pulse-generating circuit is connected with the base stage of PNP pipe in the controlled switch, and the transmitting of PNP pipe is extremely described controlled to open
The output end of pass, the colelctor electrode of PNP pipe are connected to the ground.
The pulse generation circuit include PMOS M10, NMOS tube M11, NMOS tube M12, NOT gate UA1, NOT gate UA2,
NOT gate UA3, nor gate UB1 and electric capacity C10；The controlled switch includes NMOS tube M13；The pulse generation circuit it is defeated
Enter to hold NAND gate UA1 input to be connected, NOT gate UA1 output end and PMOS M10 grid end, NMOS tube M11 grid end with
And NOT gate UA3 input is connected, PMOS M10 source is connected with positive source, PMOS M10 drain terminal, NMOS tube M11
Drain terminal NAND gate UA2 input be connected, NMOS tube M11 source is connected with NMOS tube M12 drain terminal, NMOS tube M12's
Source is connected to the ground, and electric capacity C10 one end NAND gate UA2 input is connected, and the electric capacity C10 other end is connected to the ground, or non-
Door UB1 two inputs distinguish NAND gate UA2 output end, NOT gate UA3 output end is connected, nor gate UB1 output end
For the output end of the pulse generation circuit；The output end of the pulse generation circuit and NMOS tube in the controlled switch
M13 grid end is connected, and NMOS tube M13 drain terminal is the output end of the controlled switch, and NMOS tube M13 source is connected to the ground.
Due to being using such scheme, the beneficial effects of the utility model：When lithium battery protection circuit accesses lithium electricity for the first time
Chi Shi, locking state will not be entered, but enter normal operating conditions, avoid needing to carry out charging solution to battery in production process
The operation of lock.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the utility model,
For those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Other accompanying drawings.
Fig. 1 is a kind of structural representation of embodiment containing lithium battery protection circuit of the present utility model；
Fig. 2 is a kind of structural representation for embodiment that locked circuit is eliminated in Fig. 1；
Fig. 3 is the input-output wave shape schematic diagram of pulse generation circuit in Fig. 2 embodiments；
Fig. 4, Fig. 5, Fig. 6 are possible waveform diagrams in Fig. 2 embodiments；
Fig. 7 is a kind of schematic diagram of possible specific circuit embodiments in Fig. 2 embodiments；
Fig. 8 is a kind of schematic diagram of possible specific circuit embodiments in Fig. 2 embodiments；
In accompanying drawing：
200th, li-ion cell protection control circuit；201st, locked circuit is eliminated；
202nd, current foldback circuit；203rd, short-circuit protection circuit；204th, delay circuit；
205th, cell voltage supervisory circuit；206th, over-discharge protection circuit；
207th, overcharge protection circuit；208th, logic control circuit；209th, biasing and reference circuit；
301st, pulse generation circuit；302nd, controlled switch.
801st, pulse generation circuit specific embodiment；802nd, controlled switch specific embodiment.
901st, pulse generation circuit specific embodiment；902nd, controlled switch specific embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
The circuit that electric lock is dead on lithium battery protection circuit is eliminated the utility model proposes a kind of
Fig. 1 is containing the circuit structure diagram of the present utility model for li-ion cell protection.As shown in figure 1, the circuit is by controlling
Circuit 200 processed, n type field effect transistor M1, M2 and resistance R1 compositions.The inside of li-ion cell protection control circuit 200 includes elimination
Locked circuit 201, current foldback circuit 202, short-circuit protection circuit 203, delay circuit 204, cell voltage supervisory circuit 205,
Over-discharge protection circuit 206, overcharge protection circuit 207, logic control circuit 208 and biasing and reference circuit 209.Wherein except elimination
The structure of other circuits outside locked circuit 201 follows prior art with connected mode.
Transistor M1 and M2 grid end are connected with the output of li-ion cell protection control circuit 200, are controlled by li-ion cell protection
Circuit 200 distinguishes controlling transistor M1 and M2 turn-on and turn-off.Transistor M1 is connected with M2 drain terminal, transistor M1 source
It is connected with the ground of li-ion cell protection control circuit 200.Transistor M2 source connects battery negative terminal.Li-ion cell protection control circuit
200 power supply termination battery positive (BAT+).Resistance R1 termination transistor M2 source and battery negative terminal (BAT-), electricity
The resistance R1 other end is connected with the sampled output of li-ion cell protection control circuit 200, for being detected to the state of battery,
The magnitude of voltage of GND is judged, so as to judge state that battery is in, including charging, short circuit, excessively stream etc..
Fig. 2 is the structural representation that locked circuit is eliminated in Fig. 1.As shown in Fig. 2 eliminating locked circuit 201 includes simple venation
Rush generation circuit 301 and controlled switch 302, two of pulse generation circuit 801 parts more specifically in circuit such as Fig. 7 or
In Fig. 8 shown in 802 parts, 902 part institutes in two of controlled switch 901 parts more specifically in circuit such as Fig. 7 or Fig. 8
Show.
In charging process, if lithium battery voltage, higher than protection voltage is overcharged, li-ion cell protection control circuit 200 controls
Transistor M2 is turned off, and turns off charge circuit.
In discharge process, if lithium battery voltage is less than Cross prevention voltage, li-ion cell protection control circuit 200 controls
Transistor M1 is turned off, and turns off discharge loop.
In discharge process, if discharge current occur excessive or short-circuit for lithium battery, li-ion cell protection control circuit 200 is controlled
Transistor M1 shut-offs processed, turn off discharge loop.
If not eliminating locked circuit 201, when li-ion cell protection control circuit 200 accesses lithium battery for the first time, i.e. lithium
In the power up of battery protection control circuit 200, li-ion cell protection control circuit 200 is needed by Cross prevention in power up
Normal operating conditions is returned to, and each functional module of chip internal does not settle out also, causes BAT- terminal voltages to produce high
Pulse, power up may be judged to be broken into excessively stream or short-circuit condition, so that transistor M1 is turned off, even if upper electricity is completed, electricity
Road can not also return to normal operating conditions, hence into locking state.Because this state has uncertainty, this is resulted in
It is locked in releasing under ensureing every lithium battery all, it is necessary to fill once electricity to lithium battery after lithium battery assembles with control circuit for the first time
State, it just can guarantee that lithium battery normal use.
When access eliminates locked circuit 201 in circuit, li-ion cell protection control circuit 200 is in power up, when lithium electricity
When cell voltage is higher than Cross prevention voltage, crosses and put restoring circuit action, a kind of its possible waveform VIN waveforms as shown in Figure 3,
Produce one and produce a low level arteries and veins being sometime spaced from high level to low level saltus step, pulse generation circuit
Punching, VO waveforms as shown in Figure 3, for controlling a switch conduction, BAT- terminal voltages are dragged down, BAT- ends is not produced height
Pulse, therefore, current foldback circuit and short-circuit protection circuit will not malfunction, so that power up enters normal work shape
State.Signal generation is recovered in VIN hopping edge by crossing to put, and the delay that recovery signal can also be put by crossing produces, or crosses discharge signal
Produced after carrying out logical operation with other signals, VIN signals can be rising edge or trailing edge.Pulse can be
Low level pulse or high level pulse.Several possible waveforms are as shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6.Pulse produces
The one pulse time guarantee of circuit makes BAT- occur without high level pulse, short-circuit protection circuit or current foldback circuit is not produced
False triggering.
Two kinds of physical circuit embodiments of pulse generation circuit and controlled switch are as shown in Figure 7 and Figure 8.
In embodiment shown in Fig. 7, pulse generation circuit includes PMOS M10, NMOS tube M11, NMOS tube M12, non-
Door UA1, NOT gate UA2, NOT gate UA3, NOT gate UA4, nor gate UB1 and electric capacity C10；Controlled switch includes PNP pipe.
The input NAND gate UA1 of pulse generation circuit input is connected, NOT gate UA1 output end and PMOS
The input of M10 grid end, NMOS tube M11 grid end and NOT gate UA3 is connected, PMOS M10 source and positive source phase
Even, PMOS M10 drain terminal, NMOS tube M11 drain terminal NAND gate UA2 input are connected, NMOS tube M11 source and NMOS
Pipe M12 drain terminal is connected, and NMOS tube M12 source is connected to the ground, and electric capacity C10 one end NAND gate UA2 input is connected, electricity
The other end for holding C10 is connected to the ground, nor gate UB1 two inputs difference NAND gate UA2 output end, NOT gate UA3 it is defeated
Go out end to be connected, nor gate UB1 output end NAND gate UA4 input is connected, and NOT gate UA4 output end produces electricity for pulse
The output end on road.
The output end of pulse generation circuit is connected with the base stage of PNP pipe in controlled switch, and the transmitting of PNP pipe is extremely controlled
The output end of switch, the colelctor electrode of PNP pipe are connected to the ground.When controlled switch turns on, the emitter stage of PNP pipe connects with colelctor electrode；
When controlled switch turns off, emitter stage and the colelctor electrode of PNP pipe disconnect.
In embodiment shown in Fig. 8, pulse generation circuit includes PMOS M10, NMOS tube M11, NMOS tube M12, non-
Door UA1, NOT gate UA2, NOT gate UA3, nor gate UB1 and electric capacity C10；Controlled switch includes NMOS tube M13.
The input NAND gate UA1 of pulse generation circuit input is connected, NOT gate UA1 output end and PMOS
The input of M10 grid end, NMOS tube M11 grid end and NOT gate UA3 is connected, PMOS M10 source and positive source phase
Even, PMOS M10 drain terminal, NMOS tube M11 drain terminal NAND gate UA2 input are connected, NMOS tube M11 source and NMOS
Pipe M12 drain terminal is connected, and NMOS tube M12 source is connected to the ground, and electric capacity C10 one end NAND gate UA2 input is connected, electricity
The other end for holding C10 is connected to the ground, nor gate UB1 two inputs difference NAND gate UA2 output end, NOT gate UA3 it is defeated
Go out end to be connected, nor gate UB1 output end is the output end of pulse generation circuit.
The output end of pulse generation circuit is connected with the grid end of NMOS tube M13 in controlled switch, NMOS tube M13 drain terminal
For the output end of controlled switch, NMOS tube M13 source is connected to the ground.When controlled switch turns on, NMOS tube M13 drain terminal and source
End connection；When controlled switch turns off, NMOS tube M13 drain terminal and source disconnect.
In summary, the dead circuit of electric lock on a kind of elimination lithium electric protection circuit provided by the utility model, solves lithium
Battery protecting circuit cause when upper for the first time electric possibly into can not normal work locking state, avoid lithium battery protection circuit
Need to charge when upper for the first time electric and release locked operation.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using originally special
Profit.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without by performing creative labour.Therefore, the utility model is not limited to here
Embodiment, those skilled in the art according to announcement of the present utility model, do not depart from improvement that the utility model category made and
Modification all should be within the scope of protection of the utility model.
Claims (5)
1. a kind of eliminate the circuit that electric lock is dead on lithium battery protection circuit, it is characterised in that：Including pulse generation circuit and by
Control switch；
The input of the pulse generation circuit is connected with the output end of the delay circuit in lithium battery protection circuit, Huo Zheyu
The output end of over-discharge protection circuit in lithium battery protection circuit is connected, or passes through delay with the output end of over-discharge protection circuit
Or the signal output with being obtained after other signals logical operation is connected；The output end of the pulse generation circuit with it is described controlled
The input of switch is connected, and controls the conducting and shut-off of the controlled switch；First output end of the controlled switch and ground phase
Even, input and overcurrent protection of the second output end of the controlled switch with the short-circuit protection circuit in lithium battery protection circuit
The input of circuit is connected；During the controlled switch conducting, its first output end connects with the second output end；The controlled switch
During shut-off, its first output end disconnects with the second output end.
2. according to claim 1 eliminate the circuit that electric lock is dead on lithium battery protection circuit, it is characterised in that：The simple venation
The input signal for rushing generation circuit is the trailing edge or rising edge signal of signal, and output signal is the high level being sometime spaced
Pulse or low level pulse, the time interval are that circuit can be made to return to normal operating conditions from short-circuit protection state or can make
Circuit returns to the time of normal operating conditions from overcurrent protection state.
3. according to claim 1 eliminate the circuit that electric lock is dead on lithium battery protection circuit, it is characterised in that：It is described controlled
Switch as metal oxide semiconductor transistor switch or bipolar transistor switch or diode switch.
4. eliminate the circuit that electric lock is dead on lithium battery protection circuit according to claim 1 or 2 or 3, it is characterised in that：Institute
Stating pulse generation circuit includes PMOS M10, NMOS tube M11, NMOS tube M12, NOT gate UA1, NOT gate UA2, NOT gate UA3, non-
Door UA4, nor gate UB1 and electric capacity C10；The controlled switch includes PNP pipe；
The input NAND gate UA1 of pulse generation circuit input is connected, NOT gate UA1 output end and PMOS
The input of M10 grid end, NMOS tube M11 grid end and NOT gate UA3 is connected, PMOS M10 source and positive source phase
Even, PMOS M10 drain terminal, NMOS tube M11 drain terminal NAND gate UA2 input are connected, NMOS tube M11 source and NMOS
Pipe M12 drain terminal is connected, and NMOS tube M12 source is connected to the ground, and electric capacity C10 one end NAND gate UA2 input is connected, electricity
The other end for holding C10 is connected to the ground, nor gate UB1 two inputs difference NAND gate UA2 output end, NOT gate UA3 it is defeated
Go out end to be connected, nor gate UB1 output end NAND gate UA4 input is connected, and NOT gate UA4 output end is produced for the pulse
The output end of raw circuit；
The output end of the pulse generation circuit is connected with the base stage of PNP pipe in the controlled switch, and the transmitting of PNP pipe is extremely
The output end of the controlled switch, the colelctor electrode of PNP pipe are connected to the ground.
5. eliminate the circuit that electric lock is dead on lithium battery protection circuit according to claim 1 or 2 or 3, it is characterised in that：Institute
State pulse generation circuit include PMOS M10, NMOS tube M11, NMOS tube M12, NOT gate UA1, NOT gate UA2, NOT gate UA3 or
NOT gate UB1 and electric capacity C10；The controlled switch includes NMOS tube M13；
The input NAND gate UA1 of pulse generation circuit input is connected, NOT gate UA1 output end and PMOS
The input of M10 grid end, NMOS tube M11 grid end and NOT gate UA3 is connected, PMOS M10 source and positive source phase
Even, PMOS M10 drain terminal, NMOS tube M11 drain terminal NAND gate UA2 input are connected, NMOS tube M11 source and NMOS
Pipe M12 drain terminal is connected, and NMOS tube M12 source is connected to the ground, and electric capacity C10 one end NAND gate UA2 input is connected, electricity
The other end for holding C10 is connected to the ground, nor gate UB1 two inputs difference NAND gate UA2 output end, NOT gate UA3 it is defeated
Go out end to be connected, nor gate UB1 output end is the output end of the pulse generation circuit；
The output end of the pulse generation circuit is connected with the grid end of NMOS tube M13 in the controlled switch, NMOS tube M13's
Drain terminal is the output end of the controlled switch, and NMOS tube M13 source is connected to the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720665653.0U CN206820514U (en) | 2017-06-09 | 2017-06-09 | The dead circuit of electric lock on a kind of elimination lithium battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720665653.0U CN206820514U (en) | 2017-06-09 | 2017-06-09 | The dead circuit of electric lock on a kind of elimination lithium battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206820514U true CN206820514U (en) | 2017-12-29 |
Family
ID=60758170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720665653.0U Active CN206820514U (en) | 2017-06-09 | 2017-06-09 | The dead circuit of electric lock on a kind of elimination lithium battery protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206820514U (en) |
-
2017
- 2017-06-09 CN CN201720665653.0U patent/CN206820514U/en active Active
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