CN107706965B - A kind of battery charge control circuit - Google Patents
A kind of battery charge control circuit Download PDFInfo
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- CN107706965B CN107706965B CN201710823375.1A CN201710823375A CN107706965B CN 107706965 B CN107706965 B CN 107706965B CN 201710823375 A CN201710823375 A CN 201710823375A CN 107706965 B CN107706965 B CN 107706965B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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Abstract
The invention belongs to electronic technology fields, provide a kind of battery charge control circuit, including switch control module and charge control module, and charge control module includes: limiting voltage unit, voltage lockout unit and electrical level shift units.Input voltage is subjected to voltage conversion by limiting voltage unit, so that the voltage of output is in predetermined voltage range, and pass through cathode voltage of the voltage lockout unit by the voltage lockout of the output end of charge control module for battery, so that switch control module is connected and then starts to charge the battery, pass through electrical level shift units again for the high level and low level for the output end that the high level of logic control signal and low transition are charge control module, and then charge control is carried out to battery charger, the input voltage that the negative supply of external charger can be inputted to charging control circuit controls in predetermined voltage range, without specific device without passing through specific technique, it is effectively reduced cost of implementation, improve applicability.
Description
Technical field
The invention belongs to electronic technology field more particularly to a kind of battery charge control circuits.
Background technique
With the extension of battery applications function, the power consumption requirements of battery are also significantly increased, and it is under-voltage very to will lead to battery appearance
The case where reaching 0V to voltage is consequently increased.And when it is 0V that under-voltage or even voltage, which occurs, in battery, battery protection chip can be by
It is too low in supply voltage and conventional control circuit is caused inside it to can not work normally.Therefore, how in battery protection chip
Supply voltage it is too low in the case where realize to under-voltage battery occur charge normal the problem of being urgent need to resolve.It is existing
The implementation method charged normal to under-voltage battery is usually to be realized using depletion device and/or thick grid oxygen device,
Power device in circuit uses the device with specific technique level to allow it to bear higher voltage and opens electricity
Pressure cannot be excessive, and special component and technique can all increase cost of implementation, and poor for applicability.Therefore, existing to under-voltage
The implementation method that is charged normal of battery there is a problem of cost of implementation height and poor for applicability.
Summary of the invention
The purpose of the present invention is to provide a kind of charging control circuits, it is intended to solve existing to fill under-voltage battery
There is cost of implementation height and poor for applicability in the method for electricity.
The present invention provides a kind of charging control circuit, including switch control module and charge control module, the chargings
The output end of control module is connect with the controlled end of the switch control module, the charge control module output charge control letter
Number to the switch control module, to control the on-off of the switch control module, the charge control module includes: voltage limit
Order member, voltage lockout unit and electrical level shift units；
Wherein, the input terminal of the limiting voltage unit is the input terminal of the charging control circuit, the limiting voltage
The positive power source terminal of unit and the anode of battery connect, and the negative power end of the limiting voltage unit and the cathode of battery connect, institute
The output end for stating limiting voltage unit is connect with the input terminal of the electrical level shift units, the positive supply of the voltage lockout unit
It holds and is connect with the anode of battery, the negative power end of the voltage lockout unit and the cathode of battery connect, the level shift list
The control terminal input logic of member controls signal, the output end of the output end of the electrical level shift units and the voltage lockout unit
Collectively form the output end of the charge control module；
The limiting voltage unit, for carrying out voltage conversion and output voltage to input voltage, so that the voltage of output
In predetermined voltage range；
The voltage lockout unit, for the voltage of the output end of the charge control module to be converted to the anode of battery
Voltage；
The electrical level shift units, for the high level of logic control signal to be converted to the defeated of the charge control module
The high level of outlet, by the low level for the output end that the low transition of logic control signal is the charge control module.
Input voltage is carried out voltage conversion by limiting voltage unit by battery charge control circuit provided by the invention,
So that the voltage of output is in predetermined voltage range, and pass through voltage lockout unit for the electricity of the output end of charge control module
Pressure is locked as the cathode voltage of battery, so that switch control module is connected and then starts to charge the battery, then passes through level
Shift unit is by the high level for the output end that the high level of logic control signal and low transition are charge control module and low
Level, so that the control signal of charge control module output is identical as logic control signal, and then carries out to battery charger
Charge control, the input voltage that the negative supply of external charger can be inputted to charging control circuit are controlled in predetermined voltage range
It is interior, without specific device without by specific technique, it is effectively reduced cost of implementation, improves applicability.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of battery charge control circuit provided in an embodiment of the present invention；
Fig. 2 is that a kind of level of battery charge control circuit provided in an embodiment of the present invention limits the circuit structure of unit
Figure；
Fig. 3 is the level catch unit and level shift list of a kind of battery charge control circuit provided in an embodiment of the present invention
The circuit structure diagram of member；
Fig. 4 is the level catch unit and level shift of another battery charge control circuit provided in an embodiment of the present invention
The circuit structure diagram of unit.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It should be noted that term " includes " and their any changes in description and claims of this specification
Shape, it is intended that cover and non-exclusive include.Such as process, method comprising a series of steps or units or system, product or
Equipment is not limited to listed step or unit, but optionally further comprising the step of not listing or unit or optional
Ground further includes the other step or units intrinsic for these process, methods, product or equipment.In addition, term " first ", " the
Two " and " third " etc. are for distinguishing different objects, not for description particular order.
The embodiment of the present invention in order to solve the existing method to charge to under-voltage battery there are cost of implementation height and
Problem poor for applicability provides a kind of battery charge control circuit, and input voltage is carried out voltage by limiting voltage unit
Conversion so that the voltage of output is in predetermined voltage range, and passes through voltage lockout unit for the output of charge control module
The voltage lockout at end is the cathode voltage of battery, so that switch control module is connected and then starts to charge the battery, then is led to
Over level shift unit is electric by the height for the output end that the high level of logic control signal and low transition are charge control module
Gentle low level, then the control signal for exporting charge control module is identical as logic control signal, and then charges to battery
Circuit carries out charge control, and the negative supply of external charger can be inputted to the input voltage control of charging control circuit default
In voltage range, without specific device without by specific technique, it is effectively reduced cost of implementation, improves and is applicable in
Property.
In order to illustrate technical solution of the present invention, the following is a description of specific embodiments.
Referring to Figure 1, Fig. 1 is a kind of structural schematic diagram of battery protecting circuit provided in an embodiment of the present invention.Such as Fig. 1 institute
Show, a kind of battery charge control circuit 10, including switch control module 11 and charge control module 12, charge control module 12
Output end is connect with the controlled end of switch control module 11, and charge control module 12 exports charging control signal to switch control mould
Block 12, with the on-off of control switch control module 11, charge control module 12 includes: limiting voltage unit 121, voltage lockout list
Member 122 and electrical level shift units 123.
Wherein, the input terminal of limiting voltage unit 121 is the input terminal of charging control circuit 10, limiting voltage unit 121
Positive power source terminal and the anode of battery connect, the cathode of the negative power end of limiting voltage unit 121 and battery connects, limiting voltage
The output end of unit 121 is connect with the input terminal of electrical level shift units 123, the positive power source terminal and battery of voltage lockout unit 122
Anode connection, the cathode of the negative power end of voltage lockout unit 122 and battery connects, the control terminal of electrical level shift units 123
Input logic controls signal, and the output end of electrical level shift units 123 and the output end of voltage lockout unit 122 collectively form charging
The output end of control module 12.
Limiting voltage unit 121 is used to carry out input voltage voltage conversion and output voltage, so that at the voltage of output
In in predetermined voltage range.
Voltage lockout unit 122 is used to be converted to the voltage of the output end of charge control module the cathode voltage of battery；
Electrical level shift units 123 are used to be converted to the high level of logic control signal the output end of charge control module 12
High level, by the low transition of logic control signal be charge control module 12 output end low level.
It should be noted that the positive power source terminal of the positive power source terminal of limiting voltage unit 121, voltage lockout unit 122 and
The positive power source terminal of electrical level shift units 123 is connect with the anode of battery, specifically, can connect battery by filter circuit
Anode, the negative power end of limiting voltage unit 121 and the negative power end of voltage lockout unit are all connected with the cathode with battery, usually
In the case of, the cathode voltage of battery is 0V, when the under-voltage or even cell voltage of battery appearance reaches OV, the cathode voltage of battery
For 0V, in order to make after accessing charger, battery charge control circuit 10 can be charged the battery normally, then must be kept open
It closes control module to be connected when accessing charger, that is, the grid voltage of the power switch tube of switch control module 11 is fixed
In the voltage of normal anode VDD.It is exactly by the function of switch control module that realization, which charges normal under-voltage battery,
The grid voltage of rate switching tube is fixed on the voltage of normal anode VDD so that the grid and source electrode of power switch tube it
Between voltage reach the pipe conducting voltage of power switch and be connected, and then realize charging to battery.It should be noted In
In the present embodiment, above-mentioned switch control module 11 can be switch control device, be also possible to be realized according to control signal
Other devices of switching function.
In the present embodiment, the input terminal of limiting voltage unit 121 is the input terminal of charging control circuit 10, charge control
The negative electricity of input, is pressed by the negative supply that the output end access external charger of circuit 10 provides by limiting voltage unit 121
Then row limitation exports an output voltage in predetermined voltage range, it should be noted that output voltage is also negative electricity
Pressure, therefore the device in charging control circuit 10 is only needed using low-voltage device, without depletion device or thick grid oxygen device
Part reduces the requirement to technique, improves the applicability of circuit without using the device with specific technique level, and
And significantly reduce cost of implementation.
By the output voltage access electrical level shift units 123 and electricity after limiting voltage unit 121 carries out voltage conversion
Lock cell 122 is pressed, when accessing external charger, by voltage lockout unit 122 by the output end of charge control module 12
Voltage lockout be battery cathode voltage VDD, the input terminal of the output end of charge control module 12 and switch control module connects
It connects, when the voltage lockout of the output end of charge control module 12 is the cathode voltage of battery, switch control module 11 is connected, tool
Body, the grid voltage of the power switch tube of switch control module 11 is fixed on the cathode voltage of battery, power switch tube
Voltage between grid and source electrode reaches the conducting voltage of power switch tube and is connected, and then realizes the charging to battery.With
The progress of charging, the cathode voltage of battery also gradually height, at this point, the voltage of the output end of charge control module 12 is by logic control
The high level of logic control signal is converted to the defeated of charge control module 12 by electrical level shift units 123 by signal deciding processed
The high level of outlet, by the low level for the output end that the low transition of logic control signal is charge control module 12, in turn
It realizes and the on-off of switch control module 11 is controlled, so that charging control circuit enters normal logic control state.
Fig. 2 shows the level of battery charge control circuit provided in an embodiment of the present invention limit unit circuit structure,
For ease of description, only parts related to embodiments of the present invention are shown, and details are as follows:
As shown in Fig. 2, limiting voltage unit 121 includes: first switch tube P1, second as one embodiment of the invention
Switching tube N1, third switching tube Q1, the 4th switching tube N2, the 5th switching tube P2, the 6th switching tube P3 and first resistor R1.
The first end of first switch tube P1 is the positive power source terminal of limiting voltage unit 121, the controlled end of first switch tube P1
Deviation power supply BIAS is met, the first end of the second termination second switch N1 of first switch tube P1, second switch N1's is controlled
Terminate the second end of second switch N1, the first end of the second termination third switching tube Q1 of second switch N1, third switch
The second end of the controlled termination third switching tube Q1 of pipe Q1, the second end of third switching tube Q1 are the negative of limiting voltage unit 121
Power end, the first end of the first termination first switch tube P1 of the 4th switching tube N2, the controlled termination first of the 4th switching tube N2
The second end of switching tube P1, the 4th switching tube N2 second termination the 5th switching tube P2 first end, the 5th switching tube P2 by
The second end of the 5th switching tube P2 of control termination, the first end of the second the 6th switching tube P3 of termination of the 5th switching tube P2, the 6th opens
The second end of the 6th switching tube P3 of controlled termination of pipe P3 is closed, the second of the 6th switching tube P3 terminates the second of first resistor R1
End, the first end of first resistor R1 are the input terminal of limiting voltage unit 121, and the second end of first resistor R1 is limiting voltage list
The output end of member 121.
In the present embodiment, the positive VDD of the positive supply termination battery of above-mentioned limiting voltage unit 121, limiting voltage list
The cathode VSS of the negative supply termination battery of member 121, the negative voltage CS of the input termination external charger of limiting voltage unit 121.
In the present embodiment, first switch tube P1 is PMOS tube, and the grid of PMOS tube is the controlled end of first switch tube P1,
The source electrode of PMOS tube is the first end of first switch tube P1, and the drain electrode of PMOS tube is the second end of first switch tube P1.Certainly,
One switching tube P1 can also be realized using switching devices such as triode, field-effect tube, be configured with specific reference to actual conditions, this
Place is with no restrictions.
In the present embodiment, second switch N1 is NOMS pipe, and the grid of NMOS tube is the controlled end of second switch N1,
The drain electrode of NMOS tube is the first end of second switch N1, and the source electrode of NMOS tube is the second end of second switch N1.Certainly,
Two switching tube N1 can also be realized using switching devices such as triode, field-effect tube, be configured with specific reference to actual conditions, this
Place is with no restrictions.
In the present embodiment, third switching tube Q1 is PNP type triode, and the transmitting of PNP type triode extremely third switchs
The first end of pipe Q1, the base stage of PNP type triode are the controlled end of third switching tube Q1, the current collection of PNP type triode extremely the
The second end of three switching tube Q1.Certainly, third switching tube Q1 can also be realized using switching devices such as triode, field-effect tube,
It is configured with specific reference to actual conditions, herein with no restrictions.
In the present embodiment, the 4th switching tube N2 is NOMS pipe, and the grid of NMOS tube is the controlled end of the 4th switching tube N2,
The drain electrode of NMOS tube is the first end of second switch N1, and the source electrode of NMOS tube is the second end of the 4th switching tube N2.Certainly,
Four switching tube N2 can also be realized using switching devices such as triode, field-effect tube, be configured with specific reference to actual conditions, this
Place is with no restrictions.
In the present embodiment, the 5th switching tube P2 is PMOS tube, and the grid of PMOS tube is the controlled end of the 5th switching tube P2,
The source electrode of PMOS tube is the first end of the 5th switching tube P2, and the drain electrode of PMOS tube is the second end of the 5th switching tube P2.Certainly,
Five switching tube P2 can also be realized using switching devices such as triode, field-effect tube, be configured with specific reference to actual conditions, this
Place is with no restrictions.
In the present embodiment, the 6th switching tube P3 is PMOS tube, and the grid of PMOS tube is the controlled end of the 6th switching tube P3,
The source electrode of PMOS tube is the first end of the 6th switching tube P3, and the drain electrode of PMOS tube is the second end of the 6th switching tube P3.Certainly,
Six switching tube P3 can also be realized using switching devices such as triode, field-effect tube, be configured with specific reference to actual conditions, this
Place is with no restrictions.
The level that Fig. 3 shows battery charge control circuit provided in an embodiment of the present invention limits the circuit structure of unit,
For ease of description, only parts related to embodiments of the present invention are shown, and details are as follows:
As shown in figure 3, voltage lockout unit 122 includes: the 7th switching tube P4, the 8th as one embodiment of the invention
Switching tube N3, the 9th switching tube P5 and second resistance R2.
The first end of 7th switching tube P4 is the positive power source terminal of voltage lockout unit, the controlled termination electricity of the 7th switching tube P4
The first end of the second end connection second resistance R2 of the cathode VSS, the 7th switching tube P4 in pond, the second termination the of second resistance R2
The first end of eight switching tube N3, the cathode of the controlled termination battery of the 8th switching tube N3, the second end of the 8th switching tube N3 are electricity
The negative power end of lock cell is pressed, the first end of the 9th switching tube P5 is connect with the first end of the 7th switching tube P4, the 9th switch
The controlled end of pipe P4 is connect with the second end of the 7th switching tube P3, and the second end of the 9th switching tube P3 is voltage lockout unit 122
Output end.
In the present embodiment, the 7th switching tube P4 is the first PMOS tube, and the grid of the first PMOS tube is the 7th switching tube P4
Controlled end, the source electrode of the first PMOS tube is the first end of the 7th switching tube P4, and the drain electrode of the first PMOS tube is the 7th switching tube
The second end of P4.Certainly, the 7th switching tube P4 can also be realized using switching devices such as triode, field-effect tube, with specific reference to
Actual conditions are configured, herein with no restrictions.
In the present embodiment, the 8th switching tube N3 is the first NOMS pipe, and the grid of the first NMOS tube is the 8th switching tube N3
Controlled end, the drain electrode of the first NMOS tube is the first end of the 8th switching tube N3, and the source electrode of the first NMOS tube is the 8th switching tube
The second end of N3.Certainly, the 8th switching tube N3 can also be realized using switching devices such as triode, field-effect tube, with specific reference to
Actual conditions are configured, herein with no restrictions.
In the present embodiment, the 9th switching tube P5 is the 2nd POMS pipe, and the grid of the second PMOS tube is the 9th switching tube P5
Controlled end, the source electrode of the second PMOS tube is the first end of the 9th switching tube P5, and the drain electrode of the second PMOS tube is the 9th switching tube
The second end of P5.Certainly, the 9th switching tube P5 can also be realized using switching devices such as triode, field-effect tube, with specific reference to
Actual conditions are configured, herein with no restrictions.
As one embodiment of the invention, above-mentioned electrical level shift units 123 include: the tenth switching tube P6 and 3rd resistor
R3。
The first end of 3rd resistor R3 is the input terminal of electrical level shift units 123, the second end connection the of 3rd resistor R3
The second end of ten switching tube P6, the positive VDD of the first termination battery of the tenth switching tube P6, the controlled end of the tenth switching tube P6 are
The control terminal of electrical level shift units 123, the second end of the tenth switching tube P6 are the output end of electrical level shift units 123.
In the present embodiment, the input terminal input voltage of electrical level shift units 123 limits the output voltage CS1 of unit 121,
The control terminal of electrical level shift units 123 accesses logic control signal COUTB, and the output end of electrical level shift units 123 exports charging
Control signal OC.
In the present embodiment, the tenth switching tube P6 is third PMOS tube, and the grid of third PMOS tube is the tenth switching tube P6
Controlled end, the source electrode of third PMOS tube is the first end of the tenth switching tube P6, and the drain electrode of third PMOS tube is the tenth switching tube
The second end of P6.Certainly, the tenth switching tube P6 can also be realized using switching devices such as triode, field-effect tube, with specific reference to
Actual conditions are configured, herein with no restrictions.
Further, as another implementation of the present embodiment, Fig. 4 is referred to, above-mentioned 7th switching tube P4's is controlled
Input logic is held to control signal COUTB, the controlled end input logic of the 8th switching tube N3 controls signal COUTB.
Below in conjunction with working principle of the Fig. 2 and Fig. 3 to battery charge control circuit provided in this embodiment be illustrated as
Under:
The voltage CS of the input termination external charger of limiting voltage unit 121, after carrying out voltage conversion to input voltage
Output voltage CS1.When the input voltage CS of external charger is positive voltage, output voltage CS1 and input voltage CS are equal.When
When the input voltage CS of external charger is negative voltage, output voltage CS1 is similarly negative voltage, and output voltage CS1 and input
There are a positive pressure difference δ V between voltage CS, the voltage value of input voltage CS is smaller, and positive pressure difference δ V is bigger, needs to illustrate
It is that the specific size of positive pressure difference δ V can be set according to practical application.Specifically, when input voltage CS is positive voltage
When, the 4th switching tube N2, the 5th switching tube P2, the 6th switching tube P3 are in off state, and first resistor R1 does not have electric current stream
It crosses, therefore, the voltage value of output voltage CS1 and the voltage value of input voltage CS are equal；When input voltage CS is negative voltage and electricity
When pressure value is smaller, the 4th switching tube N2, the 5th switching tube P2, the 6th switching tube P3 are in the conductive state, have in first resistor R1
Electric current flows through, so that there are a positive pressure difference δ V, the negative voltages of input voltage CS between output voltage CS1 and input voltage CS
Smaller, the electric current flowed through in first resistor R1 is bigger, and the positive pressure difference δ V between output voltage CS1 and input voltage CS is bigger,
Then export an output voltage in the predetermined voltage range, without depletion device or thick grid oxygen device, also without
The requirement to technique need to be reduced, improves the applicability of circuit, and effectively using the device with specific technique level
Reduce cost of implementation.
In order to make after accessing charger, battery charge control circuit 10 can be charged the battery normally, then must be protected
The conducting when accessing charger of switch control module 11 is held, that is, the grid of the power switch tube of switch control module 11 is electric
Pressing is scheduled on the voltage of normal anode VDD.It is exactly by switch control mould that realization, which charges normal under-voltage battery,
The grid voltage of the power switch tube of block is fixed on the voltage of normal anode VDD so that the grid of power switch tube and
Voltage between source electrode reaches the pipe conducting voltage of power switch and is connected, and then realizes the charging to battery.It will be through overvoltage
It limits unit 121 and carries out output voltage access electrical level shift units 123 and voltage lockout unit 122 after voltage conversion.It needs
Illustrate, when under-voltage or even voltage arrival 0V occurs in battery, this sentences 2 cell voltages and reaches 0V for example, not connecing
When entering external charger, cathode voltage VDD=0V, the input voltage CS=CS1=0V of external charger, logic control of battery
The voltage COUTB=0V of signal, the 7th switching tube P4, the 9th switching tube P5, the tenth switching tube P6, the 8th switching tube N3 are equal at this time
In off state, the voltage of the output end OC (input terminal of switch control module 11) of charge control module 12 is 0V, at this time
Pressure difference is 0V between the output end OC and input voltage CS of charge control module 12.After accessing external charger, input voltage CS
For negative voltage, size is related with external charger starting voltage, and charger starting voltage is bigger, defeated after access external charger
The current potential for entering voltage CS is more negative, input voltage CS signal through overvoltage limiting unit 121 carry out voltage conversion, output voltage CS1,
Output voltage CS1 is similarly negative voltage, when the starting voltage of external charger is greater than turn on voltage threshold, the negative electricity of battery
The voltage between VSS and output voltage CS1 is pressed to be greater than turn on voltage threshold, at this point, the 8th switching tube N3 is begun to turn on, and the 7th
Switching tube P4 is still in off state, and the grid voltage of the 9th switching tube P5 is equal to the voltage of output voltage CS1, thus the 9th opens
It closes pipe P5 to begin to turn on, the tenth switching tube P6 selects the biggish 3rd resistor R3 of resistance value, so that the 9th opens still in off state
It closes pipe P5 and is in linear zone, at this point, the voltage of charging control signal OC is equal to the cathode voltage VDD of battery, i.e., so that switch control
The grid voltage of the power switch tube of molding block 11 is fixed on normal anode voltage VDD, and switch control module 11
The source voltage of power switch tube is the input voltage CS of external charger, the electricity between the grid and source electrode of power switch tube
When pressure reaches the pipe conducting voltage of power switch, power switch tube conducting forms charge circuit and starts to carry out to under-voltage battery
Charging.With the charging to battery, the cathode voltage VDD of battery is gradually risen, and the 7th switching tube P4 and the tenth switching tube P6 are opened
Begin to be connected and driving capability is more and more stronger, so that the grid voltage of the 9th switching tube P5 gradually rises to VDD, at this point, the 9th
Switching tube P5 cut-off, the voltage of charging control signal OC is controlled by logic control signal COUTB at this time, and system enters normal
Logic control state.
A kind of battery charge control circuit provided in an embodiment of the present invention is carried out input voltage by limiting voltage unit
Voltage conversion so that the voltage of output is in predetermined voltage range, and passes through voltage lockout unit for charge control module
The voltage lockout of output end is the cathode voltage of battery, so that switch control module is connected and then starts to charge the battery,
It is again the output end of charge control module by the high level of logic control signal and low transition by electrical level shift units
High level and low level, then the control signal for exporting charge control module is identical as logic control signal, and then to battery
Charging circuit carries out charge control, and the input voltage control that the negative supply of external charger can be inputted to charging control circuit exists
In predetermined voltage range, without specific device without by specific technique, it is effectively reduced cost of implementation, is improved
Applicability.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of battery charge control circuit, including switch control module and charge control module, the charge control module
Output end is connect with the controlled end of the switch control module, and the charge control module output charging control signal is opened to described
Control module is closed, to control the on-off of the switch control module, which is characterized in that the charge control module includes: voltage
Limit unit, voltage lockout unit and electrical level shift units；
Wherein, the input terminal of the limiting voltage unit is the input terminal of the charging control circuit, the limiting voltage unit
Positive power source terminal and the anode of battery connect, the cathode of the negative power end of the limiting voltage unit and battery connects, the electricity
Pressure limit unit output end connect with the input terminal of the electrical level shift units, the positive power source terminal of the voltage lockout unit and
The anode connection of battery, the negative power end of the voltage lockout unit and the cathode of battery connect, the electrical level shift units
The output end of control terminal input logic control signal, the output end of the electrical level shift units and the voltage lockout unit is common
Constitute the output end of the charge control module；
The limiting voltage unit, for carrying out voltage conversion and output voltage to input voltage, so that the voltage of output is in
In predetermined voltage range；
The voltage lockout unit, for the voltage of the output end of the charge control module to be converted to the anode electricity of battery
Pressure；
The electrical level shift units, for the high level of logic control signal to be converted to the output end of the charge control module
High level, by the low transition of logic control signal be the charge control module output end low level；
When accessing external charger, by voltage lockout unit by the voltage lockout of the output end of charge control module be battery
Cathode voltage VDD, the input terminal of the output end of charge control module and switch control module connects, when charge control module
When the voltage lockout of output end is the cathode voltage of battery, switch control module conducting.
2. battery charge control circuit according to claim 1, which is characterized in that the limiting voltage unit includes:
One switching tube, second switch, third switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube and first resistor；
The first end of the first switch tube is the positive power source terminal of the limiting voltage unit, the controlled end of the first switch tube
Connect deviation power supply, the first end of the second termination second switch of the first switch tube, the second switch by
Control terminates the second end of the second switch, and the second of the second switch terminates the first end of the third switching tube,
The second end of the controlled termination of the third switching tube third switching tube, the second end of the third switching tube are the electricity
The negative power end of pressure restriction unit, the first end of the first termination first switch tube of the 4th switching tube, the described 4th
The second end of the controlled termination first switch tube of switching tube, the second termination the 5th switching tube of the 4th switching tube
First end, the second end of controlled termination the 5th switching tube of the 5th switching tube, the second of the 5th switching tube
Terminate the first end of the 6th switching tube, the second end of controlled termination the 6th switching tube of the 6th switching tube, institute
The second end of the second termination first resistor of the 6th switching tube is stated, the first end of the first resistor is the limiting voltage
The input terminal of unit, the second end of the first resistor are the output end of the limiting voltage unit.
3. battery charge control circuit according to claim 1, which is characterized in that the voltage lockout unit includes:
Seven switching tubes, the 8th switching tube, the 9th switching tube and second resistance；
The first end of 7th switching tube is the positive power source terminal of the voltage lockout unit, the controlled end of the 7th switching tube
Connecing the cathode of battery, the second end of the 7th switching tube connects the first end of the second resistance, and the of the second resistance
The first end of two termination the 8th switching tubes, the cathode of the controlled termination battery of the 8th switching tube, the 8th switch
The second end of pipe is the negative power end of the voltage lockout unit, the first end of the 9th switching tube and the 7th switching tube
First end connection, the controlled end of the 9th switching tube connect with the second end of the 7th switching tube, and the described 9th switchs
The second end of pipe is the output end of the voltage lockout unit.
4. battery charge control circuit according to claim 1, which is characterized in that the electrical level shift units include:
Ten switching tubes and 3rd resistor；
The first end of the 3rd resistor is the input terminal of the electrical level shift units, and the second end of the 3rd resistor connects institute
State the second end of the tenth switching tube, the anode of the first termination battery of the tenth switching tube, the tenth switching tube it is controlled
End is the control terminal of the electrical level shift units, and the second end of the tenth switching tube is the output of the electrical level shift units
End.
5. battery charge control circuit according to claim 3, which is characterized in that the 7th switching tube is the first PMOS
Pipe；
The grid of first PMOS tube is the controlled end of the 7th switching tube, and the source electrode of first PMOS tube is described the
The first end of seven switching tubes, the drain electrode of first PMOS tube are the second end of the 7th switching tube.
6. battery charge control circuit according to claim 3, which is characterized in that the 8th switching tube is the first NOMS
Pipe；
The grid of first NMOS tube is the controlled end of the 8th switching tube, and the drain electrode of first NMOS tube is described the
The first end of eight switching tubes, the source electrode of first NMOS tube are the second end of the 8th switching tube.
7. battery charge control circuit according to claim 3, which is characterized in that the 9th switching tube is the 2nd POMS
Pipe；
The grid of second PMOS tube is the controlled end of the 9th switching tube, and the source electrode of second PMOS tube is described the
The first end of nine switching tubes, the drain electrode of second PMOS tube are the second end of the 9th switching tube.
8. battery charge control circuit according to claim 4, which is characterized in that the tenth switching tube is the 3rd PMOS
Pipe；
The grid of the third PMOS tube is the controlled end of the tenth switching tube, and the source electrode of the third PMOS tube is described the
The first end of ten switching tubes, the drain electrode of the third PMOS tube are the second end of the tenth switching tube.
9. battery charge control circuit according to claim 3, which is characterized in that the controlled end of the 7th switching tube is defeated
Enter logic control signal, the controlled end input logic of the 8th switching tube controls signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710823375.1A CN107706965B (en) | 2017-09-13 | 2017-09-13 | A kind of battery charge control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710823375.1A CN107706965B (en) | 2017-09-13 | 2017-09-13 | A kind of battery charge control circuit |
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| CN107706965A CN107706965A (en) | 2018-02-16 |
| CN107706965B true CN107706965B (en) | 2019-11-05 |
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| CN201710823375.1A Active CN107706965B (en) | 2017-09-13 | 2017-09-13 | A kind of battery charge control circuit |
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| CN111934661B (en) * | 2020-08-04 | 2024-04-09 | 深圳市宏电技术股份有限公司 | Startup and shutdown control circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101375479A (en) * | 2006-09-13 | 2009-02-25 | 株式会社理光 | Semiconductor unit for protecting secondary battery, battery pack having the semiconductor unit built-in and electronic apparatus using it |
| JP2010093876A (en) * | 2008-10-03 | 2010-04-22 | Fujitsu Ltd | Battery unit, battery system, electronic device, charging control method of battery, and discharging control method of battery |
| CN106329613A (en) * | 2015-06-30 | 2017-01-11 | 精工半导体有限公司 | Charging/discharging control circuit, charging/discharging control device, and battery apparatus |
-
2017
- 2017-09-13 CN CN201710823375.1A patent/CN107706965B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101375479A (en) * | 2006-09-13 | 2009-02-25 | 株式会社理光 | Semiconductor unit for protecting secondary battery, battery pack having the semiconductor unit built-in and electronic apparatus using it |
| JP2010093876A (en) * | 2008-10-03 | 2010-04-22 | Fujitsu Ltd | Battery unit, battery system, electronic device, charging control method of battery, and discharging control method of battery |
| CN106329613A (en) * | 2015-06-30 | 2017-01-11 | 精工半导体有限公司 | Charging/discharging control circuit, charging/discharging control device, and battery apparatus |
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| CN107706965A (en) | 2018-02-16 |
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