CN208539557U - Protective device for lithium battery - Google Patents
Protective device for lithium battery Download PDFInfo
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- CN208539557U CN208539557U CN201820901184.2U CN201820901184U CN208539557U CN 208539557 U CN208539557 U CN 208539557U CN 201820901184 U CN201820901184 U CN 201820901184U CN 208539557 U CN208539557 U CN 208539557U
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Abstract
The utility model discloses a kind of protective devices for lithium battery; including for overcharging, the protection detection circuit of over-discharge, overcurrent protection; protection detection circuit is connected in parallel between the positive and negative anodes of lithium battery; it further include charging voltage protection circuit, charging voltage protects circuit in parallel between the charging anode of charging end and charging negative terminal；It includes governor circuit, communication isolation circuit, current collection circuit and voltage detecting circuit that charging voltage, which protects circuit; communication isolation circuit includes chip U2; the output end of the input terminal connection current collection circuit of governor circuit; it is connected between governor circuit and communication isolation circuit by I2C bus; it is connected between communication isolation circuit and voltage detecting circuit by I2C bus, voltage detecting circuit is connected in parallel between charging anode and charging negative terminal.The utility model improves the safety of protective device by charging voltage protection circuit.
Description
Technical field
The utility model relates to technical field of lithium batteries, more particularly to a kind of protective device for lithium battery.
Background technique
With the requirement of development and the environmental protection of lithium battery technology, more and more equipment, such as electric bicycle, electric motorcycle
Vehicle, Portable lighting device etc., all using lithium battery as power supply.The diversification of electrical equipment also makes battery towards more
Sampleization development is with the requirement such as the different voltages of cooperating equipment, different capacity, different capabilities.Such as: electric bicycle may be because of power
Or the requirement of mileage, and there is the vehicle of 24V, 36V, 48V, 60V series, battery can also arrange in pairs or groups battery, the charger of different voltages
It is mating with vehicle；Certain occasions or certain user may have a plurality of chargers and battery, and the battery/charger of different voltages may also
Using the charging input/output interface of same type, it is possibly realized so as to cause using the charger of mistake to charge the battery.
When charger using it is incorrect when, if the charging voltage of the voltage versus cell standard configuration of charger is high and when can also charge normal, no
It is easily found by user, the danger coefficient that accident occurs for over-charging of battery increases.
Utility model content
The purpose of this utility model is to provide the protective devices that a kind of highly-safe, detection is timely used for lithium battery.
A kind of protective device for lithium battery disclosed by the utility model the technical solution adopted is that:
A kind of protective device for lithium battery, including for overcharging, the protection detection circuit of overcurrent, Cross prevention, institute
It states protection detection circuit to be connected in parallel between the positive and negative anodes of lithium battery, further includes charging voltage protection circuit, the charging voltage is protected
Protection circuit is connected in parallel between the charging anode of charging end and charging negative terminal.
The charging voltage protection circuit includes governor circuit, communication isolation circuit, current collection circuit and voltage detecting
Circuit, the communication isolation circuit include chip U2, and the input terminal of the governor circuit connects the defeated of the current collection circuit
Outlet is connected between the governor circuit and the communication isolation circuit by I2C bus, the communication isolation circuit and described
It is connected between voltage detecting circuit by I2C bus, the voltage detecting circuit is connected in parallel on the charging anode and charging negative terminal
Between.
The governor circuit includes chip U1, first switch circuit and second switch circuit, the first switch circuit
Control terminal connects the pin 1 of the chip U1, and the output end of the first switch circuit connects the pin 1 of the chip U2, institute
The control terminal for stating second switch circuit connects the pin 5 of the chip U1, the PORT COM of the chip U1 and the chip U2
Between also connected by I2C bus.
The voltage detecting circuit includes analog-digital converter U6, is connected in parallel on the resistance R9 to charge between anode and the negative terminal that charges
With resistance R10, the pin 1 of the analog-digital converter U6 is connected between the resistance R9 and the resistance R10, and the modulus turns
The pin 6 of parallel operation U6 connects the other end of the resistance R10, the PORT COM of the analog-digital converter U6 and the chip U2 it
Between connected by I2C bus.
The protection detection circuit includes third switching circuit, and the third switching circuit includes field-effect tube Q2, described
The grid of field-effect tube Q2 connects the output end of the second switch circuit, and the field-effect tube Q2 is N-channel field-effect tube.
Preferably, the first switch circuit includes triode Q1, and the base series of the triode Q1 have electricity
Then pin 1 that R2 connects chip U1 is hindered, the collector of the triode Q1 connects the pin 1 of the chip U2.
Preferably, the second switch circuit includes the photoelectrical coupler OP1 for connecting the pin 5 of chip U1, institute
The anode for stating the light emitting diode of photoelectrical coupler OP1 is in series with resistance R6 and then connects the chip U1, the photoelectric coupling
The collector at the triode end of device OP1 connects the grid of the field-effect tube Q2, the triode end of the photoelectrical coupler OP1
Emitter connects the source electrode of the field-effect tube Q2.
Preferably, the third switching circuit further includes field-effect tube Q3, and the grid of the field-effect tube Q3 connects
The output end of the protection detection circuit is connect, the drain electrode of the field-effect tube Q3 connects the drain electrode of the field-effect tube Q2, described
The cathode of the source electrode connection lithium battery of field-effect tube Q3.
Preferably, the current collection circuit includes comparator U5, further includes being connected on cathode of lithium battery and institute
The resistance R1 between the source electrode of field-effect tube Q3 is stated, the pin 3 of the comparator U5 is in series with resistance R11 and then connects the electricity
One end of R1 is hindered, the pin 1 of the comparator U5 is in series with resistance R12 and then connects the other end of the resistance R1, the ratio
Resistance R13 is also parallel between pin 1 compared with device U5 and pin 5, the pin 4 of the comparator U5 connects drawing for the chip U1
Foot 3.
Preferably, pull-up resistor R4 and pull-up are provided in the I2C bus between the chip U1 and chip U2
Resistance R5, one end that the pull-up resistor R4 and pull-up resistor R5 converge are connected to the collector and the core of the triode Q1
Between the pin 1 of piece U2, the other end of the pull-up resistor R4 is connected to the pin 6 of the chip U1 and the pin 3 of chip U2
Between I2C bus on, the other end of the pull-up resistor R5 is connected to the I2C bus between the chip U1 and chip U2
On.
Preferably, the I2C bus between the chip U2 and the analog-digital converter U6 is provided with pull-up resistor
R7 and pull-up resistor R8, one end that the pull-up resistor R7 and pull-up resistor R8 converge are connected to 8 He of pin of the chip U2
Between the pin 5 of the analog-digital converter U6, the other end of the pull-up resistor R7 is connected to pin 6 and the institute of the chip U2
It states in the I2C bus between the pin 3 of analog-digital converter U6, the other end of the pull-up resistor R8 is connected to the chip U2's
In I2C bus between pin 7 and the pin 4 of the analog-digital converter U6.
It preferably, further include having the first voltage stabilizing chip U3, the input terminal of the first voltage stabilizing chip U3 is connected to
Between the positive and negative anodes of lithium battery, the output end of the first voltage stabilizing chip U3 connects the pin 8 and described first of the chip U1
The emitter of the triode Q1 of switching circuit.
It preferably, further include the input terminal connection institute for having the second voltage stabilizing chip U4, the second voltage stabilizing chip U4
Charging anode is stated, the output end of the second voltage stabilizing chip U4 is connected to the pin 8 and the analog-digital converter of the chip U2
Between the pin 5 of U6.
The utility model provides a kind of protective device for lithium battery, when battery connection charge power supply is charged,
Current collection circuit starts the current signal in Acquisition Circuit and feeds back to the chip U1 of governor circuit.Chip U1 exports one
Control signal gives first switch circuit, powers after first switch circuit is connected to chip U2, and is turned modulus by l2C bus
Parallel operation U6 is initialized as continuous translative mode.Analog-digital converter U6 starts constantly to read between charging anode and charging negative terminal
The branch pressure voltage of resistance R9 and resistance R10, and it is fed back to chip U1, thus to obtain the input electricity of charging positive and negative terminal
Pressure.The pin 5 of chip U1 exports control signal and turns it on to second switch circuit, and the conducting of second switch circuit drags down field-effect
The level of pipe Q2 grid, field-effect tube Q2 end that lithium battery and charging end is made not to constitute circuit, at this time analog-digital converter U6
The input voltage of the charging end read is floating voltage.By detecting the floating voltage of charging end, initial charge is detected in time
The size of voltage prevents that safety accident occurs in charging process.Until charging voltage meets the range of setting, chip U1 just can be defeated
A control signal is kept it turned off to second switch circuit out, then the level quilt of the field-effect tube Q2 grid of third switching circuit
It draws high, field-effect tube Q2 conducting makes lithium battery and charging end constitute circuit, and otherwise second switch circuit is connected always by chip U1
To control the field-effect tube Q2 cut-off of third switching circuit.When the utility model can not only detect initial state of charge
Charging voltage, can also charging voltage in real-time detection charging process.Chip U1 can enter intermittent detection during the charging process
Mode, second switch circuit will be connected to control the field-effect tube Q2 of third switching circuit in chip U1 after reaching setting time
Then the information that analog-digital converter U6 feedback is come is read in cut-off, when charging voltage is in setting range at this time, chip U1 is just
Control signal cut-off second switch circuit can be exported to which the field-effect tube Q2 of third switching circuit be connected, when charging voltage at this time
When being not in setting range, chip U1 will export control signal conduction second switch circuit to end third switching circuit
Field-effect tube Q2, reach the range of setting until chip U1 reads the charging voltage signal that analog-digital converter U6 feedback is come
Interior, chip U1 can just restore field-effect tube Q2 conducting to make lithium battery and charging end constitute complete charge circuit and then carry out
Charging.The utility model improves the security performance of equipment by charging voltage protection circuit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the protective device for lithium battery of the utility model.
Fig. 2 is the electrical block diagram of the protective device for lithium battery of the utility model.
Specific embodiment
The utility model is further elaborated and is illustrated with Figure of description combined with specific embodiments below:
Please refer to Fig. 1,2, a kind of protective device for lithium battery, including for overcharging, over-discharge, overcurrent protection protection
Detection circuit, the protection detection circuit are connected in parallel between the positive and negative anodes of lithium battery, further include charging voltage protection circuit, described
Charging voltage protects circuit in parallel between the charging anode of charging end and charging negative terminal.
The charging voltage protection circuit includes governor circuit, communication isolation circuit, current collection circuit and voltage detecting
Circuit, the communication isolation circuit include chip U2, and the input terminal of the governor circuit connects the defeated of the current collection circuit
Outlet is connected between the governor circuit and the communication isolation circuit by I2C bus, the communication isolation circuit and described
It is connected between voltage detecting circuit by I2C bus, the voltage detecting circuit is connected in parallel on the charging anode and charging negative terminal
Between.
The governor circuit includes chip U1, first switch circuit and second switch circuit, the first switch circuit
Control terminal connects the pin 1 of the chip U1, and the output end of the first switch circuit connects the pin 1 of the chip U2, institute
The control terminal for stating second switch circuit connects the pin 5 of the chip U1, the PORT COM of the chip U1 and the chip U2
Between also connected by I2C bus.
The voltage detecting circuit includes analog-digital converter U6, is connected in parallel on the resistance R9 to charge between anode and the negative terminal that charges
With resistance R10, the pin 1 of the analog-digital converter U6 is connected between the resistance R9 and the resistance R10, and the modulus turns
The pin 6 of parallel operation U6 connects the other end of the resistance R10, the PORT COM of the analog-digital converter U6 and the chip U2 it
Between connected by I2C bus.
The protection detection circuit includes third switching circuit, and the third switching circuit includes field-effect tube Q2, described
The grid of field-effect tube Q2 connects the output end of the second switch circuit, and the field-effect tube Q2 is N-channel field-effect tube.
Specifically, the first switch circuit includes triode Q1, the base series of the triode Q1 have resistance R2 right
The pin 1 of chip U1 is connected afterwards, and the collector of the triode Q1 connects the pin 1 of the chip U2.
The second switch circuit includes the photoelectrical coupler OP1 for connecting the pin 5 of chip U1, the photoelectrical coupler
The anode of the light emitting diode of OP1 is in series with resistance R6 and then connects the chip U1, the triode of the photoelectrical coupler OP1
The collector at end connects the grid of the field-effect tube Q2, and the emitter at the triode end of the photoelectrical coupler OP1 connects institute
State the source electrode of field-effect tube Q2.
The third switching circuit further includes field-effect tube Q3, and the grid of the field-effect tube Q3 connects the protection detection
The output end of circuit, the drain electrode of the field-effect tube Q3 connect the drain electrode of the field-effect tube Q2, the source of the field-effect tube Q3
The cathode of pole connection lithium battery.
Specifically, the current collection circuit includes comparator U5, it further include being connected on battery cathode and the field-effect
Resistance R1 between the source electrode of pipe Q3, the pin 3 of the comparator U5 are in series with resistance R11 and then connect the one of the resistance R1
End, the pin 1 of the comparator U5 are in series with resistance R12 and then connect the other end of the resistance R1, the comparator U5's
Resistance R13 is also parallel between pin 1 and pin 5, the pin 4 of the comparator U5 connects the pin 3 of the chip U1.
Be provided with pull-up resistor R4 and pull-up resistor R5 in I2C bus between the chip U1 and chip U2, it is described on
One end that pull-up resistor R4 and pull-up resistor R5 converge be connected to the triode Q1 collector and the chip U2 pin 1 it
Between, the other end of the pull-up resistor R4 is connected to the I2C bus between the pin 6 of the chip U1 and the pin 3 of chip U2
On, the other end of the pull-up resistor R5 is connected in the I2C bus between the chip U1 and chip U2.
I2C bus between the chip U2 and the analog-digital converter U6 is provided with pull-up resistor R7 and pull-up resistor
R8, one end that the pull-up resistor R7 and pull-up resistor R8 converge be connected to the chip U2 pin 8 and the analog-to-digital conversion
Between the pin 5 of device U6, the other end of the pull-up resistor R7 is connected to the pin 6 and the analog-digital converter of the chip U2
In I2C bus between the pin 3 of U6, the other end of the pull-up resistor R8 is connected to the pin 7 of the chip U2 and described
In I2C bus between the pin 4 of analog-digital converter U6.
It further include thering is the input terminal of the first voltage stabilizing chip U3, the first voltage stabilizing chip U3 to be connected to the positive and negative anodes of lithium battery
Between, the output end of the first voltage stabilizing chip U3 connects the pin 8 of the chip U1 and the three-level of the first switch circuit
The emitter of pipe Q1.
It further include thering is the input terminal of the second voltage stabilizing chip U4, the second voltage stabilizing chip U4 to connect the charging anode, institute
The output end for stating the second voltage stabilizing chip U4 is connected between the pin 8 of the chip U2 and the pin 5 of the analog-digital converter U6.
It should be noted that the chip U1 of governor circuit uses 8 MCU, such as the tiny13A of Atmel, the core of governor circuit
Piece U1 and analog to digital conversion circuit U6 communication uses the communication modes of I2C, and the U2 of communication isolation circuit is realized using ADum1250,
Analog to digital conversion circuit U6 realizes that the chip U1 of governor circuit passes through pin 1 using the ADS1110 series of elements of I2C interface
" PWR " pin controls Q1 and powers to U2 isolation circuit.
The bleeder circuit that current collection circuit is made of R12, R13, to obtain a voltage reference V1.V1=VDD1*
R12/(R12+R13).The value of V1 should meet greater than comparator imbalance voltage and as small as possible, so as to charging state detection circuit
It can detecte out sufficiently small charging current, when V1 voltage reference may insure that battery does not charge, comparator is defeated in stablizing
The state of high level out.When battery is in charging, electric current I is flowed through from R1, and direction is that battery-end flows to charger end, charging current
The voltage V2=R1*I generated on R1.When V2 is greater than V1, comparator output becomes low level from high level, and instruction battery is worked as
It is preceding to be in charged state.
Second switch circuit is made of R6 and OP1.When " CTL " foot of pin 5 of chip U1 exports high level, OP1 conducting, field
Effect pipe Q2 is turned off；When " CTL " foot of pin 5 of chip U1 exports low level, whether field-effect tube Q2 is connected by for overcharging,
Over-discharge, overcurrent protection protection detection circuit control.
Analog-digital converter U6 connects R9, R10 electric resistance partial pressure voltage on charging input end mouth by reading, to obtain charging
The input voltage of device.
When lithium battery is in non-charged state: comparator U5 exports high level, and instruction battery is not currently in charged state；
In a dormant state, " PWR " foot of pin 1 of chip U1 exports high level to chip U1, turns off the power supply of chip U2；Chip U1's draws
Foot 5 " CTL " export low level, field-effect tube Q2 be connected whether by for overcharging, over-discharge, overcurrent protection protection detection circuit control
System.
When lithium battery, which just connects charging end, to be charged: the pressure drop that charging current generates on sampling resistor R1 makes to compare
Low level is exported compared with device U5；The failing edge of comparator U5 output wakes up chip U1 from dormant state；Chip U1 will draw after waking up
Foot 1 " PWR " is set as low level, and field-effect tube Q1 conducting is powered to the chip U2 of communication isolation circuit；Chip U1 passes through I2C
Communication, is initialized as continuous translative mode for analog-digital converter U6, analog-digital converter U6 is made ceaselessly to read the electricity of charging port
Pressure；Chip U1 sets " CTL " foot of pin 5 output high level, and field-effect tube Q2 is ended；It is exported in " CTL " foot of pin 5 of chip U1
High level is delayed after about 20 milliseconds or so, may insure that field-effect tube Q2 reliably ends, analog-to-digital conversion device U6 is read at this time
Voltage is the floating voltage of charger；After chip U1 waits about 20 milliseconds of the transfer delay time of analog-digital converter U6 again, then go
Read the AD value of analog-digital converter U6 conversion；Whether within the acceptable range chip U1 calculates charging voltage according to AD value, such as
Voltage is normal, and chip U1 sets " CTL " foot of pin 5 output low level and restores field-effect tube Q2 conducting, and otherwise chip U1 keeps pin 5
" CTL " foot output high level persistently ends field-effect tube Q2.
When charging end voltage is initially normal, charging end voltage detection enter intermittent detection pattern: interval when
Between can be arranged as needed, for example to be set as detection in 30 seconds primary；30 second time, then it is defeated that chip U1 sets pin 5 " CTL " foot
High level out ends field-effect tube Q2；After waiting field-effect tube Q2 shutdown and 40 milliseconds of the AD conversion time, chip U1 reads mould
The conversion value of number converter U6；Whether within the acceptable range chip U1 calculates charging voltage according to AD value, if voltage is normal,
Chip U1 sets " CTL " foot of pin 5 output low level and restores field-effect tube Q2 conducting, and otherwise chip U1 keeps pin 5 " CTL " foot defeated
High level persistently ends field-effect tube Q2 out.
When detecting charging voltage exception, chip U1 can continue whether detection charging voltage can restore normal: such as hold
Continuous certain time charging voltage cannot all be restored normally, and it is low level that chip U1, which will set " CTL " foot of pin 5, set pin 1 " PWR "
Foot is high level, and enters suspend mode.When chip U1 only has charging state detection circuit newly to export a charge pulse signal
Just it is waken up again；If charging voltage restores normal within the set time, chip U1 can set " CTL " foot of pin 5 as high electricity
It is flat, and wait the arrival in 30 second period of next detection.
When chip U1 detects that charging state detection circuit is not charged state, and it is not that the state, which maintains certain time,
When charged state, it is low level that chip U1, which will set " CTL " foot of pin 5, and setting " PWR " foot of pin 1 is high level, and enters suspend mode mould
Formula.Chip U1 only has charging state detection circuit to be just waken up again when newly exporting a charge pulse signal.
The utility model provides a kind of protective device for lithium battery, when battery connection charge power supply is charged,
Current collection circuit starts the current signal in Acquisition Circuit and feeds back to the chip U1 of governor circuit.Chip U1 exports one
Control signal gives first switch circuit, powers after first switch circuit is connected to chip U2, and is turned modulus by I2C bus
Parallel operation U6 is initialized as continuous translative mode.Analog-digital converter U6 starts constantly to read between charging anode and charging negative terminal
The branch pressure voltage of resistance R9 and resistance R10, and it is fed back to chip U1, thus to obtain the input voltage of charging anode.
The pin 5 of chip U1 exports control signal and turns it on to second switch circuit, and the conducting of second switch circuit drags down field-effect tube
The level of Q2 grid, field-effect tube Q2 cut-off is to make lithium battery and charging end not constitute circuit, and analog-digital converter U6 is read at this time
The input voltage for the charging end got is floating voltage.By detecting the floating voltage of charging end, initial charge electricity is detected in time
The size of pressure prevents that safety accident occurs in charging process.Until charging voltage meets the range of setting, chip U1 can just be exported
One control signal is kept it turned off to second switch circuit, and then the level of the field-effect tube Q2 grid of third switching circuit is drawn
Height, field-effect tube Q2 conducting, makes lithium battery and charging end constitute circuit, otherwise chip U1 always by second switch circuit be connected from
And control the field-effect tube Q2 cut-off of third switching circuit.The utility model can not only detect filling when initial state of charge
Piezoelectric voltage, can also charging voltage in real-time detection charging process.Chip U1 can enter intermittent detection mould during the charging process
Formula, second switch circuit will be connected to control the field-effect tube Q2 of third switching circuit and cut in chip U1 after reaching setting time
Only, the information that analog-digital converter U6 feedback is come then is read, when charging voltage is in setting range at this time, chip U1 will
Output control signal cut-off second switch circuit to which the field-effect tube Q2 of third switching circuit be connected, when charging voltage at this time not
When in setting range, chip U1 will export control signal conduction second switch circuit to end third switching circuit
Field-effect tube Q2, until chip U1 read analog-digital converter U6 feedback come charging voltage signal reach setting in the range of,
Chip U1 can just restore field-effect tube Q2 conducting to make lithium battery and charging end constitute complete charge circuit and then be filled
Electricity.The utility model improves the security performance of equipment by charging voltage protection circuit.
Finally it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than to this reality
With the limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, this field it is general
Lead to it will be appreciated by the skilled person that can be with the technical solution of the present invention is modified or equivalently replaced, without departing from this
The spirit and scope of utility model technical solution.
Claims (9)
1. a kind of protective device for lithium battery, including for overcharging, the protection detection circuit of over-discharge, overcurrent protection, it is described
Protection detection circuit is connected in parallel between the positive and negative anodes of lithium battery, it is characterised in that: and it further include charging voltage protection circuit, it is described to fill
Piezoelectric voltage protects circuit in parallel between the charging anode of charging end and charging negative terminal；
Charging voltage protection circuit includes governor circuit, communication isolation circuit, current collection circuit and voltage detecting circuit,
The communication isolation circuit includes chip U2, and the input terminal of the governor circuit connects the output end of the current collection circuit,
It is connected between the governor circuit and the communication isolation circuit by I2C bus, the communication isolation circuit and the voltage
It is connected between detection circuit by I2C bus, the voltage detecting circuit is connected in parallel between the charging anode and charging negative terminal；
The governor circuit includes chip U1, first switch circuit and second switch circuit, the control of the first switch circuit
End connects the pin 1 of the chip U1, and the output end of the first switch circuit connects the pin 1 of the chip U2, and described the
The control terminal of two switching circuits connects the pin 5 of the chip U1, between the chip U1 and the PORT COM of the chip U2
Also connected by I2C bus；
The voltage detecting circuit includes analog-digital converter U6, is connected in parallel on the resistance R9 and electricity to charge between anode and the negative terminal that charges
R10 is hindered, the pin 1 of the analog-digital converter U6 is connected between the resistance R9 and the resistance R10, the analog-digital converter
The pin 6 of U6 connects the other end of the resistance R10, leads between the analog-digital converter U6 and the PORT COM of the chip U2
Cross the connection of I2C bus；
The protection detection circuit includes third switching circuit, and the third switching circuit includes field-effect tube Q2, the field effect
Should the grid of pipe Q2 connect the output end of the second switch circuit, the field-effect tube Q2 is N-channel field-effect tube.
2. being used for the protective device of lithium battery as described in claim 1, it is characterised in that: the first switch circuit includes three
Pole pipe Q1, the pin 1 that the base series of the triode Q1 have resistance R2 then to connect chip U1, the current collection of the triode Q1
Pole connects the pin 1 of the chip U2.
3. being used for the protective device of lithium battery as described in claim 1, it is characterised in that: the second switch circuit includes connecting
The photoelectrical coupler OP1 of the pin 5 of chip U1 is met, the anode of the light emitting diode of the photoelectrical coupler OP1 is in series with resistance
Then R6 connects the chip U1, the collector at the triode end of the photoelectrical coupler OP1 connects the field-effect tube Q2's
Grid, the emitter at the triode end of the photoelectrical coupler OP1 connect the source electrode of the field-effect tube Q2.
4. being used for the protective device of lithium battery as described in claim 1, it is characterised in that: the third switching circuit further includes
Field-effect tube Q3, the grid of the field-effect tube Q3 connect the output end of the protection detection circuit, the field-effect tube Q3's
Drain electrode connects the drain electrode of the field-effect tube Q2, the cathode of the source electrode connection lithium battery of the field-effect tube Q3.
5. as claimed in claim 4 be used for lithium battery protective device, it is characterised in that: the current collection circuit include than
It further include the resistance R1, the comparator U5 being connected between cathode of lithium battery and the source electrode of the field-effect tube Q3 compared with device U5
Pin 3 be in series with resistance R11 and then connect one end of the resistance R1, the pin 1 of the comparator U5 is in series with resistance R12
Then the other end of the resistance R1 is connected, is also parallel with resistance R13 between the pin 1 and pin 5 of the comparator U5, it is described
The pin 4 of comparator U5 connects the pin 3 of the chip U1.
6. being used for the protective device of lithium battery as claimed in claim 2, it is characterised in that: between the chip U1 and chip U2
I2C bus on be provided with pull-up resistor R4 and pull-up resistor R5, one end that the pull-up resistor R4 and pull-up resistor R5 converge
It is connected between the collector of the triode Q1 and the pin 1 of the chip U2, the other end connection of the pull-up resistor R4
In I2C bus between the pin 6 of the chip U1 and the pin 3 of chip U2, the other end of the pull-up resistor R5 is connected
In I2C bus between the chip U1 and chip U2.
7. being used for the protective device of lithium battery as described in claim 1, it is characterised in that: the chip U2 and the modulus turn
I2C bus between parallel operation U6 is provided with pull-up resistor R7 and pull-up resistor R8, the pull-up resistor R7 and pull-up resistor R8 converge
One end of conjunction is connected between the pin 8 of the chip U2 and the pin 5 of the analog-digital converter U6, the pull-up resistor R7's
The other end is connected in the I2C bus between the pin 6 of the chip U2 and the pin 3 of the analog-digital converter U6, it is described on
The other end of pull-up resistor R8 is connected to the I2C bus between the pin 7 of the chip U2 and the pin 4 of the analog-digital converter U6
On.
8. being used for the protective device of lithium battery as described in claim 1, it is characterised in that: further include having the first voltage stabilizing chip
U3, the input terminal of the first voltage stabilizing chip U3 are connected between charging anode and the anode of lithium battery, the first pressure stabilizing core
The output end of piece U3 connects the emitter of the pin 8 of the chip U1 and the triode Q1 of the first switch circuit.
9. being used for the protective device of lithium battery as described in claim 1, it is characterised in that: further include having the second voltage stabilizing chip
The input terminal of U4, the second voltage stabilizing chip U4 connect the charging anode, the output end connection of the second voltage stabilizing chip U4
Between the pin 8 of the chip U2 and the pin 5 of the analog-digital converter U6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820901184.2U CN208539557U (en) | 2018-06-11 | 2018-06-11 | Protective device for lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820901184.2U CN208539557U (en) | 2018-06-11 | 2018-06-11 | Protective device for lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208539557U true CN208539557U (en) | 2019-02-22 |
Family
ID=65382090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820901184.2U Expired - Fee Related CN208539557U (en) | 2018-06-11 | 2018-06-11 | Protective device for lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208539557U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532048A (en) * | 2019-09-17 | 2021-03-19 | 美律电子(深圳)有限公司 | Power supply equipment wake-up circuit |
-
2018
- 2018-06-11 CN CN201820901184.2U patent/CN208539557U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532048A (en) * | 2019-09-17 | 2021-03-19 | 美律电子(深圳)有限公司 | Power supply equipment wake-up circuit |
| CN112532048B (en) * | 2019-09-17 | 2022-05-13 | 美律电子(深圳)有限公司 | Power supply equipment wake-up circuit |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190222 Termination date: 20200611 |
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| CF01 | Termination of patent right due to non-payment of annual fee |