CN109921487A - The protection circuit and protective device in fast charge circuit - Google Patents
The protection circuit and protective device in fast charge circuit Download PDFInfo
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Abstract
The present invention relates to a kind of protection circuit in fast charge circuit and protective device, the protection circuit in the fast charge circuit includes charging input end, charging output end, the first chip, the second chip, first switch component, second switch component, first resistor, second resistance and third switch block；The power input of first chip is connect with the anode of the anode of the charging input end and the charging output end respectively after connecting with the power input of second chip；The first resistor, the first switch component, the second resistance, the second switch component are sequentially connected in series between the cathode of the charging input end and the cathode of the charging output end；First chip is connect with first switch component and third switch block respectively, and the second chip is connect with second switch component；Third switch block is connected between the cathode of charging input end and the cathode for the output end that charges.By the protection circuit in the fast charge circuit, the temperature rise of switch block and resistance in fast charge circuit is reduced, improves the security performance of circuit.
Description
Technical field
The present invention relates to charging technique fields, especially relate to the protection circuit and protection dress in a kind of fast charge circuit
It sets.
Background technique
In the epoch of this mobile Internet, the function of mobile phone is more and more diversified, and mobile phone is played the part of in people's daily life
Important role is drilled, frequent use of the people to mobile phone also causes battery power consumption too fast.In order to solve this problem, it removes
Increase battery capacity, it is also desirable to battery can rapidly charge, however to be charged into electricity as much as possible in a short time, that
Charging current will be increased.With the increase of charging current, fast charge protects the temperature of precision resistance and switch metal-oxide-semiconductor in circuit
Degree can dramatically increase, and cause to generate heat when the mobile phone is charging, and high temperature influences the characteristics such as capacity, circulation and the security performance of battery, may
Cause the burning even serious consequence of explosion.
Currently, with the increase of charging current, being risen in common fast charge protection circuit in order to reduce in fast charge protection circuit
To the temperature rise of the metal-oxide-semiconductor and the precision resistance as current detecting effect of on-off action, often the resistance value of metal-oxide-semiconductor is designed very
It is small.But due to the limitation of technique, the common minimum resistance value about 2m Ω for switching metal-oxide-semiconductor and precision resistance, and precision resistance
With switch metal-oxide-semiconductor all in the same circuit, fever is caused more to be concentrated.Therefore it also needs further to improve current battery of mobile phone
Fast-charging protection circuit, it is ensured that safety of the battery in large current charge.
Summary of the invention
The main object of the present invention is to provide the protection circuit and protective device in a kind of fast charge circuit, reduces fast charge circuit
The temperature rise of switch block and resistance improves the security performance of circuit.
The present invention proposes a kind of protection circuit in fast charge circuit, including charging input end, charging output end, the first chip,
Second chip, first switch component, second switch component, first resistor, second resistance and third switch block；First core
The power input of piece connect with the power input of second chip after respectively with the charging input end anode and
The anode connection of the charging output end；The first resistor, the first switch component, the second resistance, described second
Switch block is sequentially connected in series between the cathode of the charging input end and the cathode of the charging output end；First chip
It is connect respectively with the first switch component and the third switch block, second chip and the second switch component connect
It connects；The third switch block is connected between the cathode of the charging input end and the cathode for the output end that charges.
Further, the first switch component includes first switch tube and second switch, the first switch tube
Source electrode is connect with described first resistor one end, and the source electrode of the second switch is connect with described second resistance one end, and described
The drain electrode of one switching tube is connect with the drain electrode of the second switch, and the discharge end of first chip is opened with described first respectively
The grid for closing pipe is connected with the grid of the second switch.
Further, the first switch component further includes first capacitor and the second capacitor；The first of the first capacitor
End is connect with the source electrode of the first switch tube, and the second end of the first capacitor is connect with the first end of second capacitor,
The second end of second capacitor is connect with the source electrode of the second switch.
Further, the second switch component includes third switching tube and the 4th switching tube, the third switching tube
Source electrode is connect with one end of the second resistance, and the source electrode of the 4th switching tube is connect with the cathode of the charging output end,
The drain electrode of the third switching tube is connect with the drain electrode of the 4th switching tube, the discharge end of second chip and the third
The grid of switching tube connects, and the charging end of second chip is connect with the grid of the 4th switching tube.
Further, the second switch component further includes third capacitor and the 4th capacitor；The first of the third capacitor
End is connect with the source electrode of the third switching tube, and the second end of the third capacitor is connect with the first end of the 4th capacitor,
The second end of 4th capacitor is connect with the source electrode of the 4th switching tube.
Further, the third switch block includes the 5th switching tube and the 6th switching tube, the 5th switching tube
Source electrode and the cathode of charging input end connect, and the source electrode of the 6th switching tube is connect with the cathode for the output end that charges, and described the
The drain electrode of five switching tubes is connect with the drain electrode of the 6th switching tube, and the charging end of first chip is opened with the described 5th respectively
The grid for closing pipe is connected with the grid of the 6th switching tube.
Further, the third switch block further includes the 5th capacitor and the 6th capacitor；The first of 5th capacitor
End is connect with the source electrode of the 5th switching tube, and the second end of the 5th capacitor is connect with the first end of the 6th capacitor,
The second end of 6th capacitor is connect with the source electrode of the 6th switching tube.
Further, the protection circuit in above-mentioned fast charge circuit further includes 3rd resistor, described 3rd resistor one end with it is described
The connection of second switch component, the other end are connect with the charging output end.
Further, control pin is provided on first chip, the control pin is connect with charging output end.
The present invention also proposes a kind of protective device in fast charge circuit, using the protection in fast charge circuit described in any of the above embodiments
Circuit.
Compared with prior art, the beneficial effects of the present invention are: third switch block to be serially connected in the cathode of charging input end
Charging output end cathode between, by increase third switch block formed shunting circuit, flow through other switch blocks and
The electric current of resistance reduces, to reduce the temperature rise of switch block and resistance in fast charge circuit, rises to switch block and resistance
To protective effect, the security performance of circuit is improved.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the protection circuit in fast charge circuit of the embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
In figure: 1, charging input end, 2, charging output end, the 3, first chip, the 4, second chip, 5, first switch component,
6, second switch component, 7, third switch block, 8, first resistor, 9, second resistance, 10,3rd resistor, 11, first capacitor,
12, the second capacitor, 13, third capacitor, the 14, the 4th capacitor, the 15, the 5th capacitor, the 16, the 6th capacitor.
Specific embodiment
It should be appreciated that the description for being such as related to " first ", " second " in invention is used for description purposes only, and cannot understand
For its relative importance of indication or suggestion or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.Unless otherwise clearly defined and limited, art
Language " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or
It is integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be by between intermediary
It connects connected, can be the connection inside two elements.The specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.
Referring to Fig.1, the present invention proposes a kind of protection circuit in fast charge circuit, including charging input end 1, charging output end 2,
First chip 3, the second chip 4, first switch component 5, second switch component 6, first resistor 8, second resistance 9 and third switch
Component 7；The power input of first chip 3 is filled with described respectively after connecting with the power input of second chip 4
The anode connection of the anode of electrical input 1 and the charging output end 2；The first resistor 8, the first switch component 5,
The second resistance 9, the second switch component 6 are sequentially connected in series in the cathode of the charging input end 1 and charging output
Between the cathode at end 2；First chip 3 is connect with the first switch component 5 and the third switch block 7 respectively, institute
The second chip 4 is stated to connect with the second switch component 6；The third switch block 7 is connected on the negative of the charging input end 1
Between pole and the cathode for the output end 2 that charges.
In this embodiment, charging input end 1 includes anode (being indicated with symbol B+) and the charging input of charging input end 1
The cathode (being indicated with symbol B-) at end 1, the charging input end 1 is to provide the device of electric energy, including battery or battery core；It charges defeated
Outlet 2 includes connector, and the connector includes positive terminal (being indicated with symbol P+), negative terminal (with symbol P- table
Show), temperature detection resistance terminal (being indicated with symbol TH) and control terminal (being indicated with symbol CTL) etc.；First chip, 3 He
Second chip 4 is all the identical component of structure, therefore is described with the first chip 3 therein for example, described first
Chip 3 includes power input (being indicated with symbol VDD), charging end (being indicated with symbol CO), discharge end (with symbol DO table
Show) and ground terminal (being indicated with symbol VSS), the first chip 3 is turned on and off for control switch component；The first resistor
8 and the second resistance 9 be all current detecting protection precision resistance；The power input of first chip 3 and described second
Anode after the power input connection of chip 4 respectively with the anode of the charging input end 1 and the charging output end 2 connects
Connect, specifically, after the power input VDD series resistance of the first chip 3 respectively with the positive B+ of the charging input end 1 and institute
The positive P+ connection for stating charging output end 2, is connected with capacitor between the power input VDD and ground terminal VSS of the first chip 3,
Power input VDD passes through the capacity earth, similarly, the power input VDD and ground connection of the second chip 4 and the first chip 3
Hold VSS connection type identical；The first resistor 8, the first switch component 5, the second resistance 9, the second switch
Component 6 is sequentially connected in series between the cathode of the charging input end 1 and the cathode of the charging output end 2, refers to described fill
The cathode of electrical input 1 is connect with the first end of the first resistor 8, and the second end of the first resistor 8 is opened with described first
Component 5 is closed to connect, the first switch component 5 is connect with the first end of the second resistance 9, and the second of the second resistance 9
End is connect with the second switch component 6, and the second switch component 6 is connect with the cathode of the charging output end 2.Described
Three switch blocks 7 are connected between the cathode of the charging input end 1 and the cathode for the output end 2 that charges, and refer to passing through increase
The shunting circuit that third switch block 7 is formed, specifically charging input end, the first chip, third switch block and charging
The shunting circuit that output end is formed.
It is noted that the temperature rise variation in the improved fast charge circuit of the present invention is illustrated below:
First switch component 5 is denoted as Q1, second switch component 6 is denoted as Q2, third switch block 7 is denoted as Q3, the first electricity
It is total that resistance 8 is denoted as R1, second resistance 9 is denoted as R2, fast charge circuit total current is denoted as I.If the internal resistance resistance value of Q1, Q2 and Q3 are 2m
The internal resistance resistance value of Ω, R1 and R2 are 2m Ω, and the total current in fast charge circuit is 10A, i.e. RQ1=RQ2=RQ3=2m Ω, R1=
R2=2m Ω, I be total=10A.
In series circuit, all-in resistance is equal to the sum of the resistance value of each resistance.
It therefore, referring to Fig.1, be Q1, second switch component 6 in first switch component 5 be Q2, first resistor 8 is R1 and the
Two resistance 9 are in the circuit of R2 composition, and description explanation, is depicted below as the first circuit for convenience.The all-in resistance in the first circuit
It is denoted as R 1., then the all-in resistance in the first circuit are as follows:
R 1.=RQ1+RQ2+R1+R2=8m Ω.
And third switch block 7 is that Q3 forms another circuit, description explanation, is depicted below as second servo loop for convenience.
2. the all-in resistance in the first circuit is denoted as R, then the all-in resistance of second servo loop are as follows:
R 2.=RQ3=2m Ω.
The electric current in the first circuit be denoted as I 1., the electric current of second servo loop be denoted as I 2., then flow through the first circuit and second servo loop
Electric current be respectively as follows:
I 1.=the total * R of I 2./(R 1.+R 2.)=10*2/ (2+8)=2A,
I 2.=the total * R of I 1./(R 1.+R 2.)=10*8/ (2+8)=8A,
The heating power of unit time inner conductor is called thermal power, and thermal power is equal to the quadratic power of electric current I in electrical conductor
With the product of conductor resistance, i.e. P=(I^2) * R.
1. the thermal power in the first circuit is denoted as P, then when electric current flows through the first circuit, the thermal power in the first circuit at this time
Are as follows: P 1.=(I^2) * R=10*10*8=800mW.
It is total that the thermal power of total loop is denoted as P, total loop includes the first circuit and second servo loop, then total thermal power are as follows: P
Always=I 1. ^2*R 1.+I 2. ^2*R 2.=2*2*8+8*8*2=160mW.
By above-mentioned example it is found that the total current of fast charge circuit is 10A, the thermal power in the first circuit is 800mW, when increasing
After second servo loop, the thermal power of total loop is 160mW, and the electric current for flowing through the first circuit and second servo loop is reduced, battery
Thermal power and temperature rise also reduce.
In conjunction with the present invention, the third switch block 7 is connected on cathode and the charging output of the charging input end 1
Shunting circuit is formed between the cathode at end 2, is equivalent to above-mentioned second servo loop, to flow through the by increasing one article of shunting circuit
The electric current of first switch component 5, second switch component 6, first resistor 8, second resistance 9 in primary Ioops reduces, while hot merit
Rate reduces, i.e. temperature rise can be substantially reduced, and improves the security performance of circuit.
In one embodiment, the first switch component 5 include first switch tube and second switch, described first
The source electrode of switching tube is connect with described first resistor one end, and the source electrode of the second switch and described second resistance one end connect
Connect, the drain electrode of the first switch tube is connect with the drain electrode of the second switch, the discharge end of first chip respectively with
The grid of the first switch tube is connected with the grid of the second switch.
In this embodiment, the first switch component 5 includes first switch tube and the second switch (first switch
Pipe and second switch are being not shown in the figure), the source electrode of the first switch tube is connect with described first resistor one end, and described the
The other end of one resistance is connect with the cathode of the charging input end 1, the source electrode of the second switch and the second resistance
One end connection, the discharge end of first chip 3 grid with the grid of the first switch tube and the second switch respectively
Pole connection, first switch component 5 are mutually connected in series by the drain electrode of first switch tube and second switch, and first switch tube is opened with second
The structure for closing pipe is identical, and being turned on and off by first switch component 5 described in the first chip controls, i.e. control first switch
Pipe is turned on and off with second switch.
In one embodiment, the first switch component 5 further includes first capacitor 11 and the second capacitor 12；Described
The first end of one capacitor 11 is connect with the source electrode of the first switch tube, the second end of the first capacitor 11 and second electricity
Hold 12 first end connection, the second end of second capacitor 12 is connect with the source electrode of the second switch.
In this embodiment, first switch component 5 is made of switching tube, and switching tube is a kind of electrostatic sensitivity device, it
The input resistance of itself is very high, and grid and source capacitance are very small, so easily by the sense of external electromagnetic field or electrostatic
It answers and charges, a small amount of charge may form quite high voltage in interelectrode capacity, to switching tube be damaged, and because quiet
The stronger occasion of electricity is difficult to charge of releasing, and easily causes electrostatic breakdown.First capacitor 11 is identical with 12 structure of the second capacitor, for side
Just it describes, hereinafter referred to as capacitor, in the both ends shunt capacitance of first switch component 5, electrostatic is can be absorbed in capacitor, prevents first to open
The switching tube in component 5 is closed by electrostatic breakdown, ensure that the steady of switching tube operating current in first switch component 5 and voltage
It is fixed, play the role of protecting the pipe that opens the light in first switch component 5.
In one embodiment, the second switch component 6 includes third switching tube and the 4th switching tube, the third
The source electrode of switching tube is connect with one end of the second resistance, and the source electrode of the 4th switching tube is negative with the charging output end
Pole connection, the drain electrode of the third switching tube connect with the drain electrode of the 4th switching tube, the discharge end of second chip and
The grid of the third switching tube connects, and the charging end of second chip is connect with the grid of the 4th switching tube.
In this embodiment, the second switch component 6 includes third switching tube and the 4th switching tube (the third switch
Pipe and the 4th switching tube are being not shown in the figure), the source electrode of the third switching tube is connect with one end of the second resistance, described
The source electrode of 4th switching tube is connect with the cathode of the charging output end 2, and the discharge end of first chip 3 is respectively with described the
The grid of three switching tubes is connected with the grid of the 4th switching tube, and second switch component 6 is switched by third switching tube and the 4th
The drain electrode of pipe is mutually connected in series, and third switching tube is identical as the structure of the 4th switching tube, and passes through described in the second chip controls second
Switch block 6 is turned on and off, i.e., control third switching tube and the 4th switching tube are turned on and off.
In one embodiment, the second switch component 6 further includes third capacitor 13 and the 4th capacitor 14；Described
The first end of three capacitors 13 is connect with the source electrode of the third switching tube, the second end of the third capacitor 13 and the 4th electricity
Hold 14 first end connection, the second end of the 4th capacitor 14 is connect with the source electrode of the 4th switching tube.
In this embodiment, second switch component 6 is made of switching tube, and switching tube is a kind of electrostatic sensitivity device, it
The input resistance of itself is very high, and grid and source capacitance are very small, so easily by the sense of external electromagnetic field or electrostatic
It answers and charges, a small amount of charge may form quite high voltage in interelectrode capacity, to switching tube be damaged, and because quiet
The stronger occasion of electricity is difficult to charge of releasing, and easily causes electrostatic breakdown.Third capacitor 13 is identical with 14 structure of the 4th capacitor, for side
Just it describes, hereinafter referred to as capacitor, in the both ends shunt capacitance of second switch component 6, capacitor can be absorbed electrostatic, prevent third from opening
The switching tube in component 7 is closed by electrostatic breakdown, ensure that the steady of switching tube operating current in second switch component 6 and voltage
It is fixed, play the role of protecting the pipe that opens the light in second switch component 6.
In one embodiment, the third switch block 7 include the 5th switching tube and the 6th switching tube, the described 5th
The source electrode of switching tube is connect with the cathode of charging input end 1, and the source electrode of the 6th switching tube and the cathode of charging output end 2 connect
Connect, the drain electrode of the 5th switching tube is connect with the drain electrode of the 6th switching tube, the charging end of first chip respectively with
The grid of 5th switching tube is connected with the grid of the 6th switching tube.
In this embodiment, the third switch block 7 includes the 5th switching tube and the 6th switching tube (the 5th switch
Pipe and the 6th switching tube are being not shown in the figure), the source electrode of the 5th switching tube is connect with the cathode of charging input end 1, described
The source electrode of 6th switching tube is connect with the cathode of charging output end 2, and the discharge end of the third chip 3 is opened with the described 5th respectively
The grid for closing pipe is connected with the grid of the 6th switching tube, and third switch block 7 is by the 5th switching tube and the 6th switching tube
Drain electrode is mutually connected in series, and being turned on and off by third switch block 7 described in third chip controls, i.e. the 5th switching tube of control
With being turned on and off for the 6th switching tube.
In one embodiment, the third switch block 7 further includes the 5th capacitor 15 and the 6th capacitor 16；Described
The first end of five capacitors 15 is connect with the source electrode of the 5th switching tube, the second end of the 5th capacitor 15 and the 6th electricity
Hold 16 first end connection, the second end of the 6th capacitor 16 is connect with the source electrode of the 6th switching tube.
In this embodiment, third switch block 7 is made of switching tube, and switching tube is a kind of electrostatic sensitivity device, it
The input resistance of itself is very high, and grid and source capacitance are very small, so easily by the sense of external electromagnetic field or electrostatic
It answers and charges, a small amount of charge may form quite high voltage in interelectrode capacity, to switching tube be damaged, and because quiet
The stronger occasion of electricity is difficult to charge of releasing, and easily causes electrostatic breakdown.5th capacitor 15 is identical with 16 structure of the 6th capacitor, for side
Just it describes, hereinafter referred to as capacitor, in the both ends shunt capacitance of third switch block 7, capacitor can be absorbed electrostatic, prevent third from opening
The switching tube in component 7 is closed by electrostatic breakdown, ensure that the steady of switching tube operating current in third switch block 7 and voltage
It is fixed, play the role of protecting the pipe that opens the light in third switch block 7.
It in one embodiment, further include 3rd resistor 10, described 10 one end of 3rd resistor and the second switch component 6
Connection, the other end are connect with the charging output end 2.
In this embodiment, the 3rd resistor 10 is temperature detection resistance, and the temperature detection resistance is for detecting temperature
Degree, may include thermistor etc., and temperature detection resistance is used to detect the cathode of the battery charging input end of above-mentioned protection circuit
Temperature change between B- and the cathode P- of battery charging output end 2, and by data Real-time Feedback to external equipment, such as mobile phone terminal,
Real-time monitoring prevents protection circuit from superheating phenomenon occur and damaging component；Second switch component 6 includes third switching tube and the
The drain electrode of four switching tubes, third switching tube and the 4th switching tube interconnects, 10 one end of 3rd resistor and the second switch portion
Part 6 connects, and particularly connect with the source electrode of the 4th switching tube, and the 3rd resistor is connect with the charging output end 2, charging
The end TH is provided on the connector of output end 2, the end TH is the terminal for temperature detection resistance being arranged on charging output end 2,
3rd resistor is connect with the end TH, and mobile phone terminal can detect battery temperature by being connected to the 3rd resistor 10 of charging output end 2
Degree.
In one embodiment, control pin, the control pin and charging output end are provided on first chip 3
2 connections.
In this embodiment, it is provided with control pin on the first chip 3, for controlling the discharge end on the first chip 3
Opening and closing, thus the turn-on and turn-off of third switch block 7 that control is connect with the discharge end of the first chip 3.It is described
Control pin is connect with charging output end 2, refers to that the control terminal CTL of the connector of control pin and the output end 2 that charges connects
It connects, and control terminal CTL is attached with external equipment, external equipment includes mobile phone terminal.Specifically, high electricity in electronic circuit
Flat is the high state of voltage, is generally denoted as 1；Low level is the low state of voltage in electronic circuit, is generally denoted as 0；Mobile phone terminal inspection
The temperature change for surveying battery is exported when mobile phone terminal detects that battery temperature is too high or too low to the control pin of the first chip 3
High level, the discharge end and charging end for controlling the first chip 3 export low level, to control first switch component 5 and third is opened
Close the shutdown of component 7, turn-off circuit electric current, it is ensured that the safety of battery.
If mobile phone terminal can also pass through first it is noted that fast charge pattern switching is general mold filling formula by mobile phone terminal
Control pin control third switch block shutdown is provided on chip 3, to return to turn off the shunting of third switch block formation
Road, allows electric current only to flow through the first circuit, that is, flows through first switch component 5, second switch component 6, first resistor 8 and second resistance
The circuit of 9 compositions.
In conclusion the protection circuit in the fast charge circuit, reduces the temperature rise of fast charge circuit switching component and resistance, improve
The security performance of circuit, has many advantages, such as safe and reliable.
The present invention also proposes a kind of protective device in fast charge circuit, using the protection in fast charge circuit described in any of the above embodiments
Circuit.Described device includes the Intelligent hardwares such as mobile phone, tablet computer, intelligent robot, smartwatch, it is preferred that this programme refers to
Be mobile phone, using the device in the fast charge circuit, have the advantages that safe and reliable.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all utilizations
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (10)
1. a kind of protection circuit in fast charge circuit, which is characterized in that including charging input end, charging output end, the first chip, the
Two chips, first switch component, second switch component, first resistor, second resistance and third switch block；
The power input of first chip is defeated with the charging respectively after connecting with the power input of second chip
Enter the anode connection of the anode and the charging output end at end；
The first resistor, the first switch component, the second resistance, the second switch component are sequentially connected in series described
Between the cathode of charging input end and the cathode of the charging output end；
First chip is connect with the first switch component and the third switch block respectively, second chip and institute
State the connection of second switch component；
The third switch block is connected between the cathode of the charging input end and the cathode for the output end that charges.
2. the protection circuit in fast charge circuit according to claim 1, which is characterized in that the first switch component includes the
One switching tube and second switch, the source electrode of the first switch tube are connect with described first resistor one end, the second switch
The source electrode of pipe is connect with described second resistance one end, and the drain electrode of the first switch tube connects with the drain electrode of the second switch
It connects, the discharge end of first chip is connect with the grid of the grid of the first switch tube and the second switch respectively.
3. the protection circuit in fast charge circuit according to claim 2, which is characterized in that the first switch component further includes
First capacitor and the second capacitor；The first end of the first capacitor is connect with the source electrode of the first switch tube, first electricity
The second end of appearance is connect with the first end of second capacitor, the second end of second capacitor and the source of the second switch
Pole connection.
4. the protection circuit in fast charge circuit according to claim 1, which is characterized in that the second switch component includes the
The source electrode of three switching tubes and the 4th switching tube, the third switching tube is connect with one end of the second resistance, and the described 4th opens
The source electrode for closing pipe is connect with the cathode of the charging output end, the drain electrode and the leakage of the 4th switching tube of the third switching tube
Pole connection, the discharge end of second chip connect with the grid of the third switching tube, the charging end of second chip and
The grid of 4th switching tube connects.
5. the protection circuit in fast charge circuit according to claim 4, which is characterized in that the second switch component further includes
Third capacitor and the 4th capacitor；The first end of the third capacitor is connect with the source electrode of the third switching tube, the third electricity
The second end of appearance is connect with the first end of the 4th capacitor, the second end of the 4th capacitor and the source of the 4th switching tube
Pole connection.
6. the protection circuit in fast charge circuit according to claim 1, which is characterized in that the third switch block includes the
Five switching tubes and the 6th switching tube, the source electrode of the 5th switching tube and the cathode of charging input end connect, the 6th switch
The source electrode of pipe is connect with the cathode of charging output end, and the drain electrode of the 5th switching tube connects with the drain electrode of the 6th switching tube
It connects, the charging end of first chip is connect with the grid of the grid of the 5th switching tube and the 6th switching tube respectively.
7. the protection circuit in fast charge circuit according to claim 6, which is characterized in that the third switch block further includes
5th capacitor and the 6th capacitor；The first end of 5th capacitor is connect with the source electrode of the 5th switching tube, the 5th electricity
The second end of appearance is connect with the first end of the 6th capacitor, the second end of the 6th capacitor and the source of the 6th switching tube
Pole connection.
8. the protection circuit in fast charge circuit according to claim 1, which is characterized in that it further include 3rd resistor, described
Three resistance one end are connect with the second switch component, and the other end is connect with the charging output end.
9. the protection circuit in fast charge circuit according to claim 1, which is characterized in that be provided with control on first chip
Pin processed, the control pin are connect with charging output end.
10. a kind of protective device in fast charge circuit, which is characterized in that returned using such as the described in any item fast charges of claim 1-9
The protection circuit on road.
Priority Applications (1)
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| CN201910209340.8A CN109921487A (en) | 2019-03-19 | 2019-03-19 | The protection circuit and protective device in fast charge circuit |
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| CN201910209340.8A CN109921487A (en) | 2019-03-19 | 2019-03-19 | The protection circuit and protective device in fast charge circuit |
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| CN109921487A true CN109921487A (en) | 2019-06-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156956A (en) * | 2020-09-07 | 2022-03-08 | 北京小米移动软件有限公司 | Cell protection circuit, battery and terminal equipment |
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| EP0731549A2 (en) * | 1995-03-08 | 1996-09-11 | International Business Machines Corporation | Battery charger |
| CN104218542A (en) * | 2014-09-12 | 2014-12-17 | 东莞新能德科技有限公司 | Battery protection circuit |
| CN104283283A (en) * | 2014-10-27 | 2015-01-14 | 深圳市中兴移动通信有限公司 | Mobile terminal and circuit for reducing charge heating of rapid charge battery thereof |
| CN104810878A (en) * | 2014-01-28 | 2015-07-29 | 广东欧珀移动通信有限公司 | Overvoltage/overcurrent protection circuit and mobile terminal |
| CN205355895U (en) * | 2016-03-03 | 2016-06-29 | 东莞新能德科技有限公司 | Battery protection circuit |
| CN107332319A (en) * | 2017-08-31 | 2017-11-07 | 努比亚技术有限公司 | Battery protecting circuit, battery and terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0731549A2 (en) * | 1995-03-08 | 1996-09-11 | International Business Machines Corporation | Battery charger |
| CN104810878A (en) * | 2014-01-28 | 2015-07-29 | 广东欧珀移动通信有限公司 | Overvoltage/overcurrent protection circuit and mobile terminal |
| CN104218542A (en) * | 2014-09-12 | 2014-12-17 | 东莞新能德科技有限公司 | Battery protection circuit |
| CN104283283A (en) * | 2014-10-27 | 2015-01-14 | 深圳市中兴移动通信有限公司 | Mobile terminal and circuit for reducing charge heating of rapid charge battery thereof |
| CN205355895U (en) * | 2016-03-03 | 2016-06-29 | 东莞新能德科技有限公司 | Battery protection circuit |
| CN107332319A (en) * | 2017-08-31 | 2017-11-07 | 努比亚技术有限公司 | Battery protecting circuit, battery and terminal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156956A (en) * | 2020-09-07 | 2022-03-08 | 北京小米移动软件有限公司 | Cell protection circuit, battery and terminal equipment |
| CN114156956B (en) * | 2020-09-07 | 2025-06-24 | 北京小米移动软件有限公司 | Cell protection circuits, batteries and terminal equipment |
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Application publication date: 20190621 |