CN207098681U - A kind of lithium battery charge and discharge protective circuit - Google Patents
A kind of lithium battery charge and discharge protective circuit Download PDFInfo
- Publication number
- CN207098681U CN207098681U CN201720900291.9U CN201720900291U CN207098681U CN 207098681 U CN207098681 U CN 207098681U CN 201720900291 U CN201720900291 U CN 201720900291U CN 207098681 U CN207098681 U CN 207098681U
- Authority
- CN
- China
- Prior art keywords
- circuit
- pin
- battery
- lithium battery
- output
- 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.)
- Active
Links
Abstract
The utility model discloses a kind of lithium battery charge and discharge protective circuit, circuit includes lithium battery, its battery core electrode input end being connected in series and anode output end；Booster circuit, it is located between battery core electrode input end and anode output end, and for being raised the voltage that battery core electrode input end inputs and being conveyed to anode output end；Load switching circuit, it is located between battery core electrode input end and anode output end；With battery temperature detection unit, it is located on lithium battery, and in the case of temperature is less than setting value, booster circuit is opened and load switching circuit is closed；In the case of temperature is higher than setting value, booster circuit is closed and load switching circuit is opened.The utility model both ensure that the delivery efficiency of battery, also allow battery to export more energy at low temperature, and then can extend the lithium battery low operating temperatures time and prevent the novel lithium battery protection circuit to be charged under low temperature.
Description
Technical field
A kind of circuit is the utility model is related to, more particularly to a kind of lithium battery charge and discharge protective circuit.
Background technology
As shown in figure 1, traditional lithium battery charge and discharge protective circuit is mainly by a battery protection managing chip, two N
Channel MOS tube and some peripheral resistance (R1 and R2 as shown in Figure 1), electric capacity (C1 as shown in Figure 1) form.Normally make
Used time, battery protection managing chip can drive two N-channel MOS pipes in the conduction state, and battery is charged and discharged normal；
In charging process when the voltage for detecting lithium battery electric core is higher than lithium battery electric core nominal voltage scope, battery protection management core
Sector-meeting drives two N channel MOS tubes to be in cut-off state, and charge circuit is cut off, and stops charging；Detected in discharge process
When being less than lithium battery electric core nominal voltage scope to the voltage of lithium battery electric core, battery protection managing chip can drive two N ditches
Road metal-oxide-semiconductor is in cut-off state, and discharge loop is cut off, and stops electric discharge；In discharge process, when the too small output current mistake of load
When exceeding the critical field of cell output current greatly, battery protection managing chip can drive two N-channel MOS pipes to be in cut-off shape
State.
But this traditional lithium battery protection circuit mainly has following some shortcomings：
1st, equivalent specifications, current output capability can decline the lithium battery of equivalent capability at low temperature, load identical feelings
Under condition, output voltage can decline under low temperature, and this can cause lithium battery, and the working time shortens at low ambient temperatures, such as lithium battery
It is possible that output voltage leads to not the situation of work less than equipment work minimum voltage below -10 DEG C.Common
Battery protecting plate, which can not solve the problems, such as under lithium battery low temperature that output voltage is too low, to be caused equipment task time short or can not work,
So there have been mobile phone the working time is very short in winter the problem of.
2nd, lithium battery understands precipitating metal lithium under the very low environment of temperature in electrolyte, if under the very low environment of temperature
Lithium nail can be produced to lithium cell charging, damages the pellicle of lithium battery interior, makes the capacity of lithium battery reduce even short circuit burning.
Common battery protecting plate can not prevent lithium battery from being charged below 0 DEG C, certain potential safety hazard be present.
Thus, it is desirable to have a kind of technical scheme is come at least one in the drawbacks described above that overcomes or at least mitigate prior art
It is individual.
Utility model content
The purpose of this utility model is to provide a kind of lithium battery charge and discharge protective circuit to overcome or at least mitigate existing
It is at least one in the drawbacks described above of technology.
To achieve the above object, the utility model provides a kind of lithium battery charge and discharge protective circuit, the lithium battery charge and discharge
Electric protection circuit includes：Lithium battery, its battery core electrode input end being connected in series and anode output end；The lithium battery fills
Discharge protection circuit also includes：Booster circuit, it is located between the battery core electrode input end and the anode output end,
And for the voltage of battery core electrode input end input to be raised and is conveyed to the anode output end；Load switch electricity
Road, it is located between the battery core electrode input end and the anode output end；With battery temperature detection unit, it is located at
On the lithium battery, for detecting the temperature of the lithium battery, in the case of the temperature is less than setting value, the boosting electricity
Road is opened and the load switching circuit is closed；In the case of the temperature is higher than setting value, the booster circuit close and
The load switching circuit is opened.
Further, the lithium battery charge and discharge protective circuit also includes：Boost control switching circuit, the connection of its input
The battery temperature detection unit, output end connect the booster circuit and load switching circuit, and the battery temperature detection is single
Member sends temperature signal to the boosting control switching circuit, the boosting control switching circuit in response to the temperature signal,
Control the booster circuit and load switching circuit.
Further, the booster circuit includes boost chip and boosting energy storage inductor, wherein：The boost chip has
The inductance input node of the battery core electrode input end is connected in series to by the boosting energy storage inductor, is connected to the battery
The output pin and output voltage feedback pin of cathode output end, it is connected to the enabled of the boosting control switching circuit and network
Pin.
Further, the boost chip also has input pin；The booster circuit also include reference voltage sub-circuit,
Output voltage lower limit controls sub-circuit and output voltage limit value control sub-circuit, wherein：The reference voltage sub-circuit
One end is connected to the input pin, for providing reference voltage for the booster circuit；Output voltage lower limit control
The other end, the anode output end and the output voltage that circuit connects the reference voltage sub-circuit simultaneously are anti-
Pin is presented, for based on the reference voltage, controlling the lower limit of the output voltage of the booster circuit；On the output voltage
Limit value control sub-circuit simultaneously connect the anode output end, the output voltage feedback pin and network, for based on
The reference voltage, control the higher limit of the output voltage of the booster circuit.
Further, the reference voltage circuit includes the first divider resistance of series connection, the second divider resistance, and described the
One divider resistance is connected to the input pin, and second divider resistance is connected to network.
Further, the output voltage lower limit control sub-circuit includes P-channel metal-oxide-semiconductor and the first pressure limiting resistance, its
In：The P-channel metal-oxide-semiconductor has the grid being connected between first divider resistance and the second divider resistance, is connected to institute
State the source electrode of anode output end and the drain electrode of the output voltage feedback pin is connected to by the first pressure limiting resistance.
Further, the output voltage limit value control sub-circuit includes the second pressure limiting resistance and the 3rd pressure limiting resistance,
Wherein：The both ends of the second pressure limiting resistance connect the output voltage feedback pin and the anode output end respectively；
The both ends of the 3rd pressure limiting resistance connect the output voltage feedback pin and network respectively.
Further, the booster circuit also includes the first current-limiting resistance, the second current-limiting resistance, input voltage fluctuation limitation
Electric capacity and output voltage fluctuation limiting capacitance, wherein：First current-limiting resistance is connected to the input pin of the boost chip
Between enabled pin, second current-limiting resistance is connected between source electrode and the drain electrode of the P-channel metal-oxide-semiconductor, the input
Voltage pulsation limiting capacitance is connected between the battery core electrode input end and network, and the output voltage fluctuation limiting capacitance connects
It is connected between the output pin and network.
Further, the load switching circuit includes load switch chip and the 3rd current-limiting resistance, wherein：The load
Switch chip have be connected to the battery core electrode input end input pin and meanwhile connect it is described boosting control switching circuit and
The enabled pin of the battery core electrode input end, the output pin for being connected to the anode output end, it is connected to the lithium
The grounding pin of the battery core negative input of battery；3rd current-limiting resistance be connected to the battery core electrode input end with it is described
Between the enabled pin of load switch chip.
Further, the boosting control switching circuit includes LDO voltage stabilizing chips, the first N-channel MOS pipe and the 2nd N ditches
Road metal-oxide-semiconductor, wherein：The LDO voltage stabilizing chips, which have, is connected to the input pin of the battery core electrode input end, by the electricity
Pond temperature detecting unit is connected to the output pin of the grid of the first N-channel MOS pipe, is connected to the battery temperature detection
The enabled pin of unit；The source electrode of the first N-channel MOS pipe and the second N-channel MOS pipe connects network, the first N ditches
The drain electrode of road metal-oxide-semiconductor connects the grid of the second N-channel MOS pipe, and the drain electrode of the first N-channel MOS pipe is also connected with described
The enabled pin of load switch chip, the drain electrode of the second N-channel MOS pipe are also connected with the enabled pin of the boost chip.
Further, the battery temperature detection unit includes temperature detection pin, the first temperature detection resistance, second temperature
Detection resistance and divider resistance, wherein：The temperature detection pin is located on the lithium battery, and connects the LDO voltage stabilizing chips
Enabled pin；The chip that the temperature detection pin also connects the boost chip by first temperature detection resistance enables
Pin；One terminal network of the second temperature detection resistance, the other end connect the grid of the first N-channel MOS pipe simultaneously
With the output pin of the LDO voltage stabilizing chips；Divider resistance is located at the second temperature detection resistance and the LDO voltage stabilizing chips
Output pin between.
The utility model makes lithium battery by being additionally arranged booster circuit, load switching circuit and battery temperature detection unit
Directly by lithium battery electric core voltage output more than preset temperature, exported after then being boosted below preset temperature by booster circuit,
The delivery efficiency of battery had so both been ensure that, has also allowed battery to export more energy at low temperature, and then lithium can be extended
The battery low operating temperatures time and prevent the novel lithium battery protection circuit to be charged under low temperature.
Brief description of the drawings
Fig. 1 is the schematic diagram of lithium battery charge and discharge protective circuit of the prior art.
Fig. 2 is the block diagram according to the lithium battery charge and discharge protective circuit of the utility model first embodiment.
Fig. 3 a are boost chip and one part peripheral circuit schematic diagram in Fig. 2.
Fig. 3 b are boost chip and its another part peripheral circuit schematic diagram in Fig. 2.
Fig. 4 is load switch chip and its peripheral circuit schematic diagram in Fig. 2.
Fig. 5 a are a part of peripheral circuit schematic diagrames of the temperature detection chip in Fig. 2.
Fig. 5 b are temperature detection chip and its another part peripheral circuit schematic diagram in Fig. 2.
Fig. 5 c are temperature detection chip and its another part peripheral circuit schematic diagram in Fig. 2.
Fig. 6 a are a part of peripheral circuit schematic diagrames of the battery protection managing chip in Fig. 2.
Fig. 6 b are another part peripheral circuit schematic diagrames of the battery protection managing chip in Fig. 2.
Embodiment
In the accompanying drawings, represent same or similar element using same or similar label or there is same or like function
Element.Embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.
In description of the present utility model, term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation of the instruction such as " level ", " top ", " bottom " " interior ", " outer " or position relationship are based on orientation shown in the drawings or position
Relation, it is for only for ease of description the utility model and simplifies description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to scope of protection of the utility model
Limitation.
As shown in Fig. 2 the lithium battery charge and discharge protective circuit that the present embodiment is provided includes lithium battery, battery protecting circuit
1st, booster circuit 2, load switching circuit 8 and battery temperature detection unit 9, battery protection managing chip 11, booster circuit 2, bear
Load switch circuit 8, battery temperature detection unit 9 are powered by lithium battery electric core.Wherein：
Lithium battery has positive pole output channel and negative pole output channel, and the positive pole output channel includes the battery core being connected in series
Electrode input end 4 and anode output end 6, the negative pole output channel include the battery core negative input 5 and electricity being connected in series
Pond cathode output end 7.
Battery protecting circuit 1 includes battery protection managing chip 11, the protections of the first protection circuit FET Q1 and second
Circuit FET Q2.First protection circuit FET Q1 and the second protection circuit FET Q2 is N-channel MOS pipe,
Wherein：First protection circuit FET Q1 drive end connection battery protection managing chip 11, receives battery protection management core
The control signal 1 that piece 11 inputs.First protection circuit FET Q1 is also connected with the protection circuit of battery core electrode input end 4 and second
FET Q2.Second protection circuit FET Q2 drive end connection battery protection managing chip 11, receives battery protection
The control signal 2 that managing chip 11 inputs.Second protection circuit FET Q2 is also connected with GND output end 7.
Specifically as shown in figures 6 a and 6b, battery protection managing chip 11 is that U1, Q1 and the Q2 shown in figure is respectively
First protection circuit FET Q1 and the second protection circuit FET Q2, TP1 is battery core negative input 5, and H2 is battery
Cathode output end 7, R1, R2 are resistance, and C2 is electric capacity.Battery protection managing chip U1 1 pin and the first protection circuit field-effect
Pipe Q1 1 pin is connected, and battery protection managing chip U1 2 pin are connected with resistance R1 one end, resistance R1 other end connection net
Network GND.Battery protection managing chip U1 3 pin are connected with the second protection circuit FET Q2 1 pin, the second protection circuit field
Effect pipe U1 4 pin are vacantly without any connection.Battery protection managing chip U1 5 pin are connected with resistance R2 one end, battery
Conservative management chip U1 5 pin are connected with electric capacity C2 one end simultaneously, electric capacity C2 other end connection network G ND, resistance R2's
The other end is connected with TP2 (battery core electrode input end 4)；First protection circuit FET Q1 2 pin are connected with TP1；First protects
Protection circuit FET Q1 3 pin are connected with the second protection circuit FET Q2 3 pin；Second protection circuit FET
Q2 2 pin are connected with H2, while are connected to network G ND.By detecting lithium battery electric core whether occur overcharging, cross put, excessively stream
Problem, battery protection managing chip are turned on and off what is externally exported or input to control battery by switch Q1, Q2
Conducting and cut-off.
Booster circuit 2 is located between battery core electrode input end 4 and anode output end 6, and for battery core positive pole is defeated
The voltage for entering the input of end 4 raises and is conveyed to anode output end 6.Load switching circuit 8 is located at battery core electrode input end 4
Between anode output end 6.
Battery temperature detection unit 9 is located on lithium battery, for detecting the temperature of lithium battery.In the temperature less than setting
In the case of value, booster circuit 2 is opened and load switching circuit 8 is closed；In the case of the temperature is higher than setting value, boosting
Circuit 2 is closed and load switching circuit 8 is opened.When booster circuit 2 is opened, because booster circuit 2 is the output that can only boost, no
Can reversely it input, while now load switching circuit 8 is closed, so battery charging path blocks at low temperature, nothing
Method is charged, and serves the effect of protection；When load switching circuit 8 is opened, electric current can input, and can output, charge and discharge
It is electric normal." booster circuit opening " herein represents that booster circuit works, and " closing " represents that booster circuit does not work.
" load switching circuit opening " represents switch conduction, and " load switching circuit closing " represents switch OFF.
When the battery core electrode input end 4 and battery core negative input 5 of lithium battery access and battery core electrode input end 4 and battery core
Voltage between negative input 5 is in nominal operating range, and battery protection managing chip 11 can drive the first protection circuit
FET Q1 and the second protection circuit FET Q2 conductings, the conducting of GND output channel.Battery protecting circuit 1 can lead to
Battery temperature detection unit 9 is crossed to detect the temperature of lithium battery, when battery temperature is more than preset temperature (such as 0 DEG C), control
Booster circuit 2 is closed, while controls load switching circuit 8 to open, and anode output channel is opened, output voltage and lithium battery
Battery core voltage is identical.When battery temperature is less than preset temperature, control booster circuit 2 is opened, while controls load switching circuit 8
Close, cell output voltage is the voltage after lithium battery electric core boosting.
The present embodiment makes lithium battery by being additionally arranged booster circuit 2, load switching circuit 8 and battery temperature detection unit 9
Directly by lithium battery electric core voltage output more than preset temperature, exported after then being boosted below preset temperature by booster circuit,
The delivery efficiency of battery had so both been ensure that, has also allowed battery to export more energy at low temperature, and then lithium can be extended
The battery low operating temperatures time and the novel lithium battery protection circuit to be charged under low temperature is prevented, to improve the security of battery.
In one embodiment, the lithium battery charge and discharge protective circuit also includes boosting control switching circuit 10, boosting
The input connection battery temperature detection unit 9 of control switching circuit 10, the output end connection of boosting control switching circuit 10 rise
Volt circuit 2 and load switching circuit 8, battery temperature detection unit 9 send temperature signal to boosting control switching circuit 10, boosted
Control switching circuit 10 controls the booster circuit 2 and load switching circuit 8 in response to the temperature signal.Cut by boosting
The temperature for the lithium battery that control circuit 10 detects according to battery temperature detection unit 9 is changed, controls booster circuit 2 and load switch
The opening and closing of circuit 8.
As shown in Figure 3 a and Figure 3 b shows, in one embodiment, boost chip U4 model is SY7069 in booster circuit 2,
It specifically includes boost chip U4 and boosting energy storage inductor L1, wherein：The energy storage inductor L1 that boosts boosts for energy storage.The boosting
Chip U4, which has, to be connected in series to the inductance input node 41 of the battery core electrode input end 4 by the energy storage inductor L1 that boosts, connects
Be connected to the anode output end 6 output pin 42 and output voltage feedback pin 43, be connected to it is described boosting switching control
The enabled pin 44 of circuit 10 and network G ND processed, the grounding pin 46 for being connected to network G ND.So, beaten in booster circuit 2
Open, that is, in the case of conducting, after can the voltage of input be raised, then export.
In one embodiment, boost chip U4 also has input pin 45.Booster circuit 2 also includes reference voltage electricity
Road, output voltage lower limit control sub-circuit and output voltage limit value control sub-circuit, wherein：The reference voltage sub-circuit
An end be connected to the input pin 45, for for booster circuit 2 provide reference voltage.Output voltage lower limit control
The other end, anode output end 6 and the output voltage feedback that circuit connects the reference voltage sub-circuit simultaneously are drawn
Pin 43, for based on the reference voltage, controlling the lower limit of the output voltage of the booster circuit.The output voltage limit
Value control sub-circuit connects anode output end 6, output voltage feedback pin 43 and network G ND simultaneously, for based on described
Reference voltage, control the higher limit of the output voltage of the booster circuit.
In one embodiment, the reference voltage circuit includes the first divider resistance R7 of series connection, the second divider resistance
R10, and the first divider resistance R7 is connected to input pin 45, the second divider resistance R10 is connected to network G ND.First partial pressure electricity
R7 and the second divider resistance R10 is hindered together to the input voltage V of booster circuit 2INCarry out partial pressure and obtain reference voltage Vref：Vref=
VIN*R10/(R7+R10)。
In one embodiment, the output voltage lower limit control sub-circuit includes the limits of P-channel metal-oxide-semiconductor Q5 and first
Piezoresistance R9, wherein：P-channel metal-oxide-semiconductor Q5 is used for the voltage lower limit value V exported to booster circuit 2LLLimited, by boosting electricity
The output voltage lower limit V on road 2LLIt is limited in " reference voltage+VGS(th)", i.e. VLL=VIN*R10/(R7+R10)+VGS(th),
VGS(th)For P-channel metal-oxide-semiconductor Q5 threshold voltage of the grid.Specifically, P-channel metal-oxide-semiconductor Q5, which has, is connected to the first divider resistance R7
And second grid 1 between divider resistance R10, it is connected to the source electrode 2 of anode output end 6 and by the first pressure limiting resistance
R9 is connected to the drain electrode 3 of output voltage feedback pin 43.First pressure limiting resistance R9 is anti-to output voltage for limiting output voltage
Present the electric current of pin 43.If there is no P-channel metal-oxide-semiconductor Q5 in booster circuit 2, without output voltage lower limit VLL, output electricity
All-the-time stable is pressed in the higher limit V of output voltageHL。
In one embodiment, the output voltage limit value control sub-circuit includes the second pressure limiting resistance R8 and the 3rd
Pressure limiting resistance R12, wherein：Second pressure limiting resistance R8 both ends connect the output voltage feedback pin 43 and the battery respectively
Cathode output end 6；3rd pressure limiting resistance R12 both ends connect the output voltage feedback pin 43 and network G ND respectively.Second
Pressure limiting resistance R8 and the 3rd pressure limiting resistance R12 is used for the upper voltage limit value V exported to booster circuit 2 togetherHLLimited, will be risen
The output voltage lower limit V of volt circuit 2HLIt is limited to：VHL=VREF*(R8+R12)/R12.If there is no second in booster circuit 2
Pressure limiting resistance R8, then output voltage be equal to output voltage lower limit VLL。
Therefore, the magnitude of voltage that booster circuit 2 exports is in output voltage lower limit VLLWith output voltage limit value VHLIt
Between, because the input voltage V of booster circuit 2INFor lithium battery electric core output voltage, (battery core electrode input end 4 and battery core negative pole are defeated
Enter both potential differences of end 5), the voltage changes with the change of the existing energy of battery, and the parameter of resistance can be with circuit
Regulation, if output voltage lower limit VLLLess than the higher limit V of output voltageHL, then output voltage be equal to output voltage lower limit
VLL；If output voltage lower limit VLLMore than the higher limit V of output voltageHL, then output voltage be equal to output voltage higher limit
VHL.It can start booster circuit 2 when battery temperature is less than predetermined temperature, make the voltage of lithium battery electric core by boosting
After export power supply to the device, the temperature value of triggering and the voltage of boosting output can be changed by regulation resistance.
In one embodiment, booster circuit 2 also includes the first current-limiting resistance R11, the second current-limiting resistance R13, input electricity
Pressure fluctuation limiting capacitance C7 and output voltage fluctuation limiting capacitance C8, wherein：First current-limiting resistance R11 is connected to the boosting core
Between piece U4 input pin 45 and enabled pin 44, the second current-limiting resistance R13 is connected to P-channel metal-oxide-semiconductor Q5 source electrode 2
Between drain electrode 3, input voltage fluctuation limiting capacitance C7 is connected between battery core electrode input end 4 and network G ND, output voltage
Fluctuation limiting capacitance C8 is connected between output pin 42 and network G ND.First current-limiting resistance R11 arrives for limiting input voltage
The electric current of boost chip U4 enabled pin 44.Second current-limiting resistance R13 is used to limit output voltage to the defeated of boost chip U4
Go out the electric current of Voltage Feedback pin 43.Input voltage fluctuation limiting capacitance C7 is used for the electricity for controlling the input voltage of booster circuit 2
Pressure fluctuation.Output voltage fluctuation limiting capacitance C8 is used for the voltage pulsation for controlling the output voltage of booster circuit 2.
As shown in figure 4, in one embodiment, load switch chip U3 model TPS22913, it specifically includes negative
Load switch chip U3 and the 3rd current-limiting resistance R6, wherein：Load switch chip U3, which has, is connected to the defeated of battery core electrode input end 4
Enter pin 31 while connect the enabled pin 32 of boosting control switching circuit 10 and the battery core electrode input end 4, be connected to electricity
The output pin 33 of pond cathode output end 6, be connected to lithium battery battery core negative input 5 grounding pin 34；3rd current limliting
Resistance R6 is connected between battery core electrode input end 4 and load switch chip U3 enabled pin 32.Load switching circuit 8 is real
Existing function is that the conducting and closing of the external input and output path of battery are realized in the control for receiving temperature detecting unit.
As shown in Fig. 5 a to 5c, in one embodiment, boosting control switching circuit 10 includes LDO voltage stabilizing chips U2, the
One N-channel MOS pipe Q3 and the second N-channel MOS pipe Q4, wherein：LDO voltage stabilizing chips U2, LDO voltage stabilizing chip U2 models are
TLV70725, it, which has, is connected to the input pin 21 of the battery core electrode input end 4, is connected by battery temperature detection unit 9
It is connected to the output pin 22 of the first N-channel MOS pipe Q3 grid, is connected to the enabled pin of the battery temperature detection unit 9
23；First N-channel MOS pipe Q3 and the second N-channel MOS pipe Q4 source electrode connect network G ND, the first N-channel MOS pipe Q3 leakage
Pole connects the grid of the second N-channel MOS pipe Q4, and the first N-channel MOS pipe Q3 drain electrode is also connected with load switch chip U3's
Enabled pin 32, the second N-channel MOS pipe Q4 drain electrode are also connected with boost chip U4 enabled pin 44.
Boosting control switching circuit 10 is used for the opening and closing for controlling booster circuit 2, load switching circuit 8, and load is opened
Booster circuit 2 is closed while powered-down road 8 is opened, booster circuit 2 can close load switching circuit 8 while opening, and both are not
It can work and simultaneously close off simultaneously.The control signal output of boosting control switching circuit 10 is automatically switched according to the change of temperature,
The control of miscellaneous equipment or circuit is not needed.
In one embodiment, the function that battery temperature detection unit 9 is realized is to detect the inside temperature of lithium battery work
Degree, and the temperature is conveyed to boosting control switching circuit 10.Specifically, battery temperature detection unit 9 includes temperature detection pin
H1, the first temperature detection resistance R3, second temperature detection resistance R5 and the 4th divider resistance R4, wherein：Temperature detection pin H1 is set
On the lithium battery, and connect LDO voltage stabilizing chips U2 enabled pin 23；The temperature detection pin H1 also passes through the first temperature
Detection resistance R3 connection boost chips U4 enabled pin 44；A termination network G ND of the second temperature detection resistance R5, separately
One end connects the first N-channel MOS pipe Q3 grid and LDO voltage stabilizing chips U2 output pin 22 simultaneously；4th divider resistance R4
It is located between second temperature detection resistance R5 and LDO voltage stabilizing chip U2 output pin 22.
It is last it is to be noted that：Above example is only to illustrate the technical solution of the utility model, rather than it is limited
System.It will be understood by those within the art that：Technical scheme described in foregoing embodiments can be modified, or
Person carries out equivalent substitution to which part technical characteristic；These modifications are replaced, and take off the essence of appropriate technical solution
From the spirit and scope of various embodiments of the utility model technical scheme.
Claims (11)
1. a kind of lithium battery charge and discharge protective circuit, including：
Lithium battery, its battery core electrode input end (4) being connected in series and anode output end (6)；
Characterized in that, also include：
Booster circuit (2), it is located between the battery core electrode input end (4) and the anode output end (6), and is used for
The voltage that the battery core electrode input end (4) inputs is raised and is conveyed to the anode output end (6)；
Load switching circuit (8), it is located between the battery core electrode input end (4) and the anode output end (6)；With
Battery temperature detection unit (9), it is located on the lithium battery, for detecting the temperature of the lithium battery, in the temperature
In the case of degree is less than setting value, the booster circuit (2) is opened and the load switching circuit (8) is closed；In the temperature
In the case of higher than setting value, the booster circuit (2) is closed and the load switching circuit (8) is opened.
2. lithium battery charge and discharge protective circuit as claimed in claim 1, in addition to：
Boost control switching circuit (10), and its input connects the battery temperature detection unit (9), and output end connects the liter
Volt circuit (2) and load switching circuit (8), the battery temperature detection unit (9) to it is described boosting control switching circuit (10)
Send temperature signal, the boosting control switching circuit (10) in response to the temperature signal, control the booster circuit (2) and
Load switching circuit (8).
3. lithium battery charge and discharge protective circuit as claimed in claim 2, it is characterised in that the booster circuit (2) includes rising
Chip (U4) and boosting energy storage inductor (L1) are pressed, wherein：The boost chip (U4), which has, passes through the boosting energy storage inductor
(L1) it is connected in series to the inductance input node (41) of the battery core electrode input end (4), is connected to the anode output
The output pin (42) and output voltage feedback pin (43) at end (6), it is connected to the boosting control switching circuit (10) and net
The enabled pin (44) of network (GND).
4. lithium battery charge and discharge protective circuit as claimed in claim 3, it is characterised in that the boost chip (U4) also has
Input pin (45)；
The booster circuit (2) is also included on reference voltage sub-circuit, output voltage lower limit control sub-circuit and output voltage
Limit value controls sub-circuit, wherein：
One end of the reference voltage sub-circuit is connected to the input pin (45), for providing base for the booster circuit (2)
Quasi- voltage；
The output voltage lower limit control sub-circuit is connecting the other end of the reference voltage sub-circuit, the battery just simultaneously
Pole output end (6) and the output voltage feedback pin (43), for based on the reference voltage, controlling the boosting electricity
The lower limit of the output voltage on road；
It is anti-that output voltage limit value control sub-circuit connects the anode output end (6), the output voltage simultaneously
Pin (43) and network (GND) is presented, for based on the reference voltage, controlling the upper limit of the output voltage of the booster circuit
Value.
5. lithium battery charge and discharge protective circuit as claimed in claim 4, it is characterised in that the reference voltage sub-circuit includes
The first divider resistance (R7), the second divider resistance (R10) of series connection, and first divider resistance (R7) is connected to the input
Pin (45), second divider resistance (R10) are connected to network (GND).
6. lithium battery charge and discharge protective circuit as claimed in claim 5, it is characterised in that the output voltage lower limit control
Sub-circuit includes P-channel metal-oxide-semiconductor (Q5) and the first pressure limiting resistance (R9), wherein：The P-channel metal-oxide-semiconductor (Q5), which has, to be connected to
Grid between first divider resistance (R7) and the second divider resistance (R10), it is connected to the anode output end (6)
Source electrode and the drain electrode of the output voltage feedback pin (43) is connected to by the first pressure limiting resistance (R9).
7. the lithium battery charge and discharge protective circuit as any one of claim 4 to 6, it is characterised in that the output electricity
Pressure higher limit control sub-circuit includes the second pressure limiting resistance (R8) and the 3rd pressure limiting resistance (R12), wherein：The second pressure limiting electricity
The both ends of resistance (R8) connect the output voltage feedback pin (43) and the anode output end (6) respectively；Described 3rd
The both ends of pressure limiting resistance (R12) connect the output voltage feedback pin (43) and network (GND) respectively.
8. lithium battery charge and discharge protective circuit as claimed in claim 7, it is characterised in that the booster circuit (2) also includes
First current-limiting resistance (R11), the second current-limiting resistance (R13), input voltage fluctuation limiting capacitance (C7) and output voltage fluctuation limit
Electric capacity (C8) processed, wherein：First current-limiting resistance (R11) is connected to the boost chip (U4) input pin (45) and made
Between energy pin (44), second current-limiting resistance (R13) is connected to the P-channel of the output voltage lower limit control sub-circuit
Between the source electrode of metal-oxide-semiconductor (Q5) and drain electrode, the input voltage fluctuation limiting capacitance (C7) is connected to the battery core positive pole input
Hold between (4) and network (GND), the output voltage fluctuation limiting capacitance (C8) is connected to the output pin (42) and network
(GND) between.
9. lithium battery charge and discharge protective circuit as claimed in claim 7, it is characterised in that load switching circuit (8) bag
Load switch chip (U3) and the 3rd current-limiting resistance (R6) are included, wherein：The load switch chip (U3) is described with being connected to
The input pin (31) of battery core electrode input end (4) at the same connect it is described boosting control switching circuit (10) and the battery core just
The enabled pin (32) of pole input (4), the output pin (33) for being connected to the anode output end (6), it is connected to institute
State the grounding pin (34) of the battery core negative input (5) of lithium battery；3rd current-limiting resistance (R6) is connected to the battery core
Between electrode input end (4) and the enabled pin (32) of the load switch chip (U3).
10. lithium battery charge and discharge protective circuit as claimed in claim 9, it is characterised in that the boosting control switching circuit
(10) LDO voltage stabilizing chips (U2), the first N-channel MOS pipe (Q3) and the second N-channel MOS pipe (Q4) are included, wherein：The LDO is steady
Pressure chip (U2), which has, to be connected to the input pin (21) of the battery core electrode input end (4), is detected by the battery temperature
Unit (9) is connected to the output pin (22) of the grid of the first N-channel MOS pipe (Q3), is connected to the battery temperature inspection
Survey the enabled pin (23) of unit (9)；The source electrode of the first N-channel MOS pipe (Q3) and the second N-channel MOS pipe (Q4) connects
Network (GND), the drain electrode of the first N-channel MOS pipe (Q3) connect the grid of the second N-channel MOS pipe (Q4), and described the
The drain electrode of one N-channel MOS pipe (Q3) is also connected with the enabled pin (32) of the load switch chip (U3), second N-channel
The drain electrode of metal-oxide-semiconductor (Q4) is also connected with the enabled pin (44) of the boost chip (U4).
11. lithium battery charge and discharge protective circuit as claimed in claim 10, it is characterised in that the battery temperature detection unit
(9) temperature detection pin (H1), the first temperature detection resistance (R3), second temperature detection resistance (R5) and divider resistance are included
(R4), wherein：The temperature detection pin (H1) is located on the lithium battery, and connects the enabled of the LDO voltage stabilizing chips (U2)
Pin (23)；The temperature detection pin (H1) also connects the boost chip (U4) by first temperature detection resistance (R3)
Chip enable pin (44)；A terminal network (GND) for the second temperature detection resistance (R5), the other end connect institute simultaneously
State the grid of the first N-channel MOS pipe (Q3) and the output pin (22) of the LDO voltage stabilizing chips (U2)；Divider resistance (R4) is set
Between the second temperature detection resistance (R5) and the output pin (22) of the LDO voltage stabilizing chips (U2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720900291.9U CN207098681U (en) | 2017-07-24 | 2017-07-24 | A kind of lithium battery charge and discharge protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720900291.9U CN207098681U (en) | 2017-07-24 | 2017-07-24 | A kind of lithium battery charge and discharge protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207098681U true CN207098681U (en) | 2018-03-13 |
Family
ID=61546109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720900291.9U Active CN207098681U (en) | 2017-07-24 | 2017-07-24 | A kind of lithium battery charge and discharge protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207098681U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336348A (en) * | 2019-04-24 | 2019-10-15 | 华为技术有限公司 | A kind of terminal, switching capacity booster circuit and method of supplying power to |
| CN110955315A (en) * | 2018-09-27 | 2020-04-03 | 西安中兴新软件有限责任公司 | Electronic device, control method and computer storage medium thereof |
| CN111316528A (en) * | 2018-07-27 | 2020-06-19 | 华为技术有限公司 | Power supply circuit of terminal equipment, terminal equipment and power supply method |
-
2017
- 2017-07-24 CN CN201720900291.9U patent/CN207098681U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111316528A (en) * | 2018-07-27 | 2020-06-19 | 华为技术有限公司 | Power supply circuit of terminal equipment, terminal equipment and power supply method |
| US11949272B2 (en) | 2018-07-27 | 2024-04-02 | Honor Device Co., Ltd. | Power supply circuit of terminal device, terminal device, and power supply method |
| CN110955315A (en) * | 2018-09-27 | 2020-04-03 | 西安中兴新软件有限责任公司 | Electronic device, control method and computer storage medium thereof |
| CN110336348A (en) * | 2019-04-24 | 2019-10-15 | 华为技术有限公司 | A kind of terminal, switching capacity booster circuit and method of supplying power to |
| CN110336348B (en) * | 2019-04-24 | 2021-12-03 | 华为技术有限公司 | Terminal, switched capacitor boost circuit and power supply method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207098681U (en) | A kind of lithium battery charge and discharge protective circuit | |
| CN103092315B (en) | The mobile terminal of rear recovery application program can be restarted | |
| CN207283252U (en) | Surge protection circuit for power compensator | |
| CN109786876A (en) | A kind of charging method, device and charging equipment, charging system | |
| CN204012676U (en) | A kind of battery detecting and protective circuit | |
| CN101207294A (en) | Battery pre-charging circuit | |
| CN117220399A (en) | Lithium battery, solar power supply conversion circuit and conversion control method | |
| CN107887956A (en) | It is a kind of to avoid battery from crossing the protection circuit put and battery supply set | |
| CN107769190A (en) | Minitype high voltage pre-charging device | |
| CN106684972A (en) | Driving device and driving method for increasing standby time of batteries | |
| CN109638928A (en) | A kind of power supply management circuit, method | |
| CN207398813U (en) | Current foldback circuit and electronic equipment | |
| CN206820461U (en) | Power supply protection circuit | |
| CN207218276U (en) | A kind of charging device | |
| CN206302182U (en) | A kind of back-up source controls charge and discharge device using metal-oxide-semiconductor | |
| CN107425599A (en) | Surge protection circuit for power compensator | |
| CN209250302U (en) | A kind of lithium electric protection electronic switch | |
| CN204464971U (en) | Battery protecting circuit, electric energy generator and electronic installation | |
| CN207504636U (en) | A kind of projecting apparatus with power-off protection function | |
| CN205283163U (en) | Mobile device lithium battery supply manages circuit | |
| CN206389130U (en) | A kind of charge control system | |
| CN207504563U (en) | A kind of Undervoltage protection circuit for battery for having the function of independently to restore | |
| CN207617523U (en) | A kind of anti-ignition device of electric vehicle | |
| CN207218305U (en) | Short-circuit protection circuit and battery charger | |
| CN2907031Y (en) | Battery charging control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 310051 Room 301, building B, building 2, No. 399, Danfeng Road, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou fluorite Network Co.,Ltd. Address before: No. 555, Qianmo Road, Binjiang District, Hangzhou City, Zhejiang Province, 310052 Patentee before: HANGZHOU EZVIZ NETWORK Co.,Ltd. |
|
| CP03 | Change of name, title or address |