CN105680422B - Improved battery protects circuit and system - Google Patents
Improved battery protects circuit and system Download PDFInfo
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- CN105680422B CN105680422B CN201610215078.4A CN201610215078A CN105680422B CN 105680422 B CN105680422 B CN 105680422B CN 201610215078 A CN201610215078 A CN 201610215078A CN 105680422 B CN105680422 B CN 105680422B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
Abstract
The present invention provides a kind of improved battery protection circuit and system, and improved battery protection circuit includes low-voltage testing circuit, switch, discharge switch pipe, over-current detection circuit and logic control circuit.Switch is connected between one end of starting key and the cathode of battery core, and the other end of starting key is connected with the anode of battery core；The input terminal of low-voltage testing circuit is connected with battery core, and output terminal is connected with the control terminal switched；First connecting pin of discharge switch is connected with the cathode of battery core, and second connection end is connected with second source end, and the first power end is connected with the anode of battery core；The first input end of logic control circuit is connected with the output terminal of over-current detection circuit, and the second input terminal is connected with the output terminal of low-voltage testing circuit, and output terminal is connected with the control terminal of discharge switch pipe.Compared with prior art, the present invention in systems exist directly from battery core take electricity discharge module when, can realize the defencive function complete to battery.
Description
【Technical field】
The present invention relates to battery protection technical field, more particularly to a kind of improved battery protection circuit and system.
【Background technology】
A kind of novel battery protection circuit of the prior art and system to smaller electronic system, such as bluetooth headset,
All systems are integrated in on a chip, and all system power supplies are all monitored by the chip, battery protection function
It is complete.But some increasingly complex systems, such as Baffle Box of Bluetooth, sometimes user need special high-power driving, be
The output volume of Baffle Box of Bluetooth is improved, needs additionally to increase audio frequency power amplifier, and this audio power amplifier circuit power consumption is larger, it is existing
Highly integrated chip can not generally export so big electric current, if the audio power amplifier circuit works as battery directly from battery electricity-taking
During in over-pressed discharge condition or overcurrent discharge condition, the protection act for forbidding electric discharge can not be realized.
Therefore, it is necessary to circuit and system is protected to be improved existing novel battery.
【Invention content】
The purpose of the present invention is to provide a kind of improved battery protection circuit and systems, exist in systems directly from electricity
When core takes the discharge module of electricity, the defencive function complete to battery can be realized.
To solve the above-mentioned problems, according to an aspect of the present invention, the present invention provides a kind of improved battery protection electricity
Road, including low-voltage testing circuit, switch, discharge switch pipe, over-current detection circuit and logic control circuit.The one of the switch
End is connected with one end of starting key, and the other end of the switch is connected with the cathode of battery core, the other end of the starting key
It is connected with the anode of battery core；The input terminal of the low-voltage testing circuit is connected with battery core, the control of output terminal and the switch
End is connected, and whether the low-voltage testing circuit is used to detect the voltage of battery core less than low pressure detection threshold value, when detecting battery core
When voltage is less than the low pressure detection threshold value, the output terminal output low-voltage variation signal of the low-voltage testing circuit is opened with control
Shutdown is opened；When the voltage for detecting battery core is higher than the low pressure detection threshold value, the output terminal output of the low-voltage testing circuit
Non- low-voltage variation signal is opened with control switch, and the first connecting pin of the discharge switch is connected with the cathode of battery core, and second
Connecting pin is connected with second source end, and the first power end is connected with the anode of battery core；The over-current detection circuit is used to detect electricity
Core whether discharge by overcurrent, and when detecting that battery core is in overcurrent discharge condition, the output terminal of the over-current detection circuit exported
Flow protection signal；When detecting that battery core is in non-overcurrent discharge condition, the output terminal of the over-current detection circuit exports non-mistake
Flow protection signal；The first input end of the logic control circuit is connected with the output terminal of over-current detection circuit, the second input
End is connected with the output terminal of the low-voltage testing circuit, and output terminal is connected with the control terminal of the discharge switch pipe, described to patrol
Control circuit is collected to be used for when at least receiving one in overcurrent protection signal and low-voltage variation signal, it is defeated by its output terminal
Go out shutdown control signal, so that the discharge switch pipe disconnects；It is protected when receiving non-overcurrent protection signal and receiving non-low pressure
When protecting signal, conductivity control signal is exported by its output terminal, so that the discharge switch pipe is opened.
Further, the input terminal of the over-current detection circuit is connected with the first connecting pin of the discharge switch pipe, when
When the over-current detection circuit detects that the voltage of the first connecting pin of discharge switch pipe is higher than the voltage threshold of over-current detection, institute
State the output terminal output overcurrent protection signal of over-current detection circuit；When the over-current detection circuit detects the first of discharge switch
When the voltage of connecting pin is less than the voltage threshold of over-current detection, the output terminal of the over-current detection circuit exports non-overcurrent protection letter
Number, it can connect discharge module between first power end and second source end.
Further, the voltage threshold of the over-current detection is 10mV~200mV；The resistance of the discharge switch pipe is 1
The milliohm of milliohm~200.
Further, the discharge switch pipe is NMOS transistor, and the first connecting pin of the discharge switch is source electrode, the
Two connecting pins are drain electrode, and control terminal is grid；Improved battery protection circuit, which further includes, is connected to the first power end and the
Capacitance between two power ends.
Further, the improved battery protection circuit further includes booting detection circuit and electric power management circuit,
The booting detection circuit is used to, when at least one of switch and starting key are off, pass through it
Output terminal out-put supply cut-off signals；When switch and starting key are opened, pass through its output terminal out-put supply Continuity signal；
The electric power management circuit is connected with the output terminal of the booting detection circuit, and the electric power management circuit, which is used to work as, receives institute
When stating the power-down signal of booting detection circuit output, the discharge path controlled by electric power management circuit is cut off；When receiving
During the power supply Continuity signal of the booting detection circuit output, the discharge path controlled by electric power management circuit is connected.
Further, improved battery protection circuit further includes the negative of the other end for being connected to the switch and battery core
Resistance between pole, the input terminal of the booting detection circuit are connected with the connecting node between switch and resistance, the booting
Detection circuit is used for when the voltage of the connecting node between switch and resistance is less than booting detection threshold value, defeated by its output terminal
Go out power managing signal；When the voltage of the connecting node between switch and resistance is more than booting detection threshold value, pass through its output
Hold out-put supply cut-off signals.
Further, the improved battery protection circuit is integrated on same chip, the first power end and the second electricity
Capacitance is connected between source, the capacitance is located at outside the chip；The discharge switch pipe is the resistance to voltage devices of 5V.
Further, the improved battery protection circuit further includes the output terminal for being connected to logic control circuit and electric discharge
Slope control circuit between the control terminal of switching tube, what which disconnected or opened for reducing discharge switch pipe
Speed；The over-current detection circuit further includes timing module, when the over-current detection circuit detects the first of discharge switch pipe
When the voltage of connecting pin is higher than the voltage threshold of over-current detection, expression detects that overcurrent is discharged, and the timing module starts timing,
If the overcurrent discharge period of timing module record is more than the predetermined time, the output terminal output overcurrent of the over-current detection circuit
Protection signal.
Further, the improved battery protection circuit further includes charge management circuit, charge switch pipe and substrate choosing
Circuit is selected, one end of the charge switch pipe is connected with the battery core, and the other end is connected with charge power supply, control terminal and institute
The output terminal for stating charge management circuit is connected；The first input end of the charge management circuit is connected with battery core, the second input
End is connected with charge power supply, and the charge management circuit is used to be more than the battery core when the voltage for detecting the charge power supply
During voltage, the charge switch pipe conducting is controlled to charge the battery core；The substrate selection circuit is connected to described fill
The substrate of electric switch pipe, and the substrate electricity of the automatic charge switch pipe conscientiously of working condition according to the charge switch pipe
Pressure.
According to another aspect of the present invention, the present invention provides a kind of battery protection system, including secondary battery core and changes
Into type battery protecting circuit, the improved battery protection circuit includes low-voltage testing circuit, switch, discharge switch pipe, overcurrent
Detection circuit and logic control circuit.One end of the switch is connected with one end of starting key, the other end of the switch with
The cathode of battery core is connected, and the other end of the starting key is connected with the anode of battery core；The input terminal of the low-voltage testing circuit
It is connected with battery core, output terminal is connected with the control terminal of the switch, and the low-voltage testing circuit is used to detect the voltage of battery core
Whether less than low pressure detection threshold value, when the voltage for detecting battery core is less than the low pressure detection threshold value, the low pressure detection electricity
The output terminal output low-voltage variation signal on road, is disconnected with control switch；When the voltage for detecting battery core is detected higher than the low pressure
During threshold value, the output terminal of the low-voltage testing circuit exports non-low-voltage variation signal, is opened with control switch, the discharge switch
The first connecting pin be connected with the cathode of battery core, second connection end is connected with second source end, the first power end and battery core
Anode is connected；The over-current detection circuit for detect battery core whether overcurrent discharge, when detect battery core be in overcurrent discharge shape
During state, the output terminal output overcurrent protection signal of the over-current detection circuit；When detecting that battery core is in non-overcurrent discharge condition
When, the output terminal of the over-current detection circuit exports non-overcurrent protection signal；The first input end of the logic control circuit with
The output terminal of over-current detection circuit is connected, and the second input terminal is connected with the output terminal of the low-voltage testing circuit, output terminal
It is connected with the control terminal of the discharge switch pipe, the logic control circuit is for ought at least receive overcurrent protection signal and low
When pressing one in protection signal, shutdown control signal is exported by its output terminal, so that the discharge switch pipe disconnects；When connecing
When receiving non-overcurrent protection signal and receiving non-low-voltage variation signal, conductivity control signal is exported by its output terminal, so that
The discharge switch pipe is opened.
Further, discharge module is connected between the first power end and second source end, the discharge module includes
The audio power amplifier circuit of Baffle Box of Bluetooth.
Compared with prior art, the present invention adds discharge switch pipe on the basis of existing novel battery protects circuit,
The discharge switch pipe and heavy-current discharge module are sequentially connected between the positive and negative anodes of battery core, are discharged when detecting that battery core is in
When stream mode or electric discharge overvoltage condition, discharge switch pipe is turned off, so as to there is the electric discharge that electricity is directly taken from battery core in systems
During module, the defencive function complete to battery is realized.
【Description of the drawings】
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for this
For the those of ordinary skill of field, without having to pay creative labor, it can also be obtained according to these attached drawings other
Attached drawing.Wherein：
Fig. 1 is the circuit diagram of the battery protection system of the present invention in one embodiment；
Fig. 2 is the circuit diagram of the battery protection system of the present invention in a preferred embodiment.
【Specific embodiment】
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
" one embodiment " or " embodiment " referred to herein refers to may be included at least one realization method of the present invention
A particular feature, structure, or characteristic." in one embodiment " that different places occur in the present specification not refers both to same
A embodiment, nor the individual or selective embodiment mutually exclusive with other embodiment.Unless stated otherwise, herein
In connect, be connected, connecting expression be electrically connected word represent directly or indirectly to be electrical connected.
Shown in please referring to Fig.1, the circuit diagram for the battery protection system of the present invention in one embodiment.Fig. 1
Shown battery protection system includes improved battery protection circuit 100 and discharge module 200.
Improved battery protection circuit 100 shown in FIG. 1 includes low-voltage testing circuit 110, booting detection circuit 120, electricity
Power management circuits 130 and switch K1.
One end of the switch K1 is connected with one end of starting key Button, and the other end of the switch K1 passes through resistance
R4 is connected with the cathode of battery core BT1, and the other end of starting key Button is connected with the anode of battery core BT1.
The input terminal of the low-voltage testing circuit 110 is connected with the anode of battery core BT1, and output terminal is with the switch K1's
Control terminal is connected, and whether the low-voltage testing circuit 110 is used to detect the voltage of battery core BT1 less than low pressure detection threshold value, works as inspection
When measuring the voltage of battery BT1 less than the low pressure detection threshold value, the output terminal BATH outputs of the low-voltage testing circuit 110 are low
Protection signal is pressed, is disconnected with control switch K1, so as to cut through the leakage path of resistance R4；When the electricity for detecting battery BT1
When pressure is higher than the low pressure detection threshold value, the output terminal BATH of the low-voltage testing circuit 110 exports non-low-voltage variation signal, with
Control switch K1 is opened.In one embodiment, the low pressure detection threshold value is designed to more than or equal to the battery core BT1's
Overvoltage discharge prevention threshold value, and less than the minimum operating voltage of system (for example, value between 2.0V~2.9V), to avoid battery core
During BT1 brownouts, since over-discharge leads to battery loss, which is always maintained at work.The low pressure
Protection signal and non-low-voltage variation signal can be two kinds of logic states of a signal, for example, the low-voltage variation signal is
Low level, the non-low-voltage variation signal are high level.
The booting detection circuit 120 is used to disconnect shape when switch at least one of K1 and starting key Button are in
During state, pass through its output terminal ON out-put supply cut-off signals；It is defeated by its when switch K1 and starting key Button is opened
Outlet ON out-put supply Continuity signals.The power-down signal and power supply Continuity signal can be two kinds of logics of a signal
State, for example, the power-down signal is low level, the power supply Continuity signal is high level.
The electric power management circuit 130 is connected, and electric power management circuit with the output terminal of the booting detection circuit 120
130 power end is connected with the anode of battery core BT1, and the electric power management circuit 130 is used for electric when receiving the booting detection
During the power-down signal that road 120 exports, the discharge path controlled by electric power management circuit 130 is cut off, battery core BT1 is forbidden to pass through
The discharge path discharges；When receiving the power supply Continuity signal that the booting detection circuit 120 exports, connect by power management
The discharge path that circuit 130 controls.The electric power management circuit 130 can include DC-to-dc converter, voltage regulator,
One in power switch, charge pump or arbitrary combination, so as to when battery core BT1 is abnormal, battery core BT1 be forbidden to put
Electricity, so as to fulfill battery protection function.
In the embodiment shown in fig. 1, it is described booting detection circuit 120 input terminal KON with switch K1 and resistance R4 it
Between connecting node be connected, output terminal ON is connected with electric power management circuit 130, and power end is connected with the anode of battery core BT1.
When the voltage of battery core BT1 is less than the low pressure detection threshold value, low-voltage testing circuit 110 exports low pressure by its output terminal BATH
Protection signal, control switch K1 are disconnected, and cut through the leakage path of resistance R4.Pass through cut-out switch K1, resistance R4 meetings simultaneously
By the voltage pull-down of the input terminal KON for the detection circuit 120 that is switched on, make the voltage of input terminal KON less than booting detection threshold value, thus
Make booting detection circuit 120 by its output terminal BATH out-put supply cut-off signals, so that electric power management circuit 130 is cut off by electricity
The discharge path that power management circuits 130 control, avoids the over-discharge to battery core BT1.In this way, when the voltage of battery core BT1 is less than
During the low pressure detection threshold value, even if button Buttom is pressed by false triggering (for example, during transport), chip quilt will not occur
False triggering works and leads to the problem of the excessive power consumption to battery core BT1.Meanwhile false triggering causes battery core BT1 to discharge by resistance R4
Leak channel be also turned off, during so as to realize battery core BT1 brownouts, reduce the effect of electric leakage.
It once mentions in the background technology, some complicated systems, such as Baffle Box of Bluetooth, user needs special big work(sometimes
Rate drives, and in order to improve the output volume of Baffle Box of Bluetooth, needs additionally to increase audio frequency power amplifier (or heavy-current discharge module), and this
Audio power amplifier circuit power consumption is larger, and audio power amplifier circuit is needed directly to take electricity from battery core BT1, discharges when battery core BT1 is in overvoltage
When state or overcurrent discharge condition, to realize total ban discharge prevention, the battery protecting circuit 100 in Fig. 1, which also has additional, to be put
Electric switch pipe MN1, over-current detection circuit 140 and logic control circuit 150.
The first connecting pin of the discharge switch pipe MN1 is connected with the cathode of battery core BT1, second connection end and the second electricity
Source P- is connected, and the first power end P+ is connected with the anode of battery core BT1, and discharge module 200 is connected to the first power end P+ and
Between two power end P-.When discharge switch MN1 is opened, battery core BT1 can directly power to discharge module 200；Work as electric discharge
When switch MN1 is disconnected, cut-out battery core BT1 is to the discharge path of discharge module 200.In one embodiment, the electric discharge mould
Block 200 includes the audio power amplifier circuit of Baffle Box of Bluetooth.
The over-current detection circuit 140 for detecting battery core BT1, whether discharge by overcurrent, when detecting that battery core BT1 was in
When banishing electricity condition, the output terminal COP output overcurrent protection signals of the over-current detection circuit 140；When detecting at battery core BT1
When non-overcurrent discharge condition, the output terminal COP of the over-current detection circuit 140 exports non-overcurrent protection signal.It is shown in Fig. 1
Embodiment in, the input terminal of the over-current detection circuit 140 is connected with the first connecting pin of the discharge switch pipe MN1, when
The over-current detection circuit 140 detects that the voltage of the first connecting pin of discharge switch pipe MN1 is higher than the voltage threshold of over-current detection
During value, the output terminal OCP output overcurrent protection signals of the over-current detection circuit 140；When the over-current detection circuit 140 detects
When voltage to the first connecting pin of discharge switch MN1 is less than the voltage threshold of over-current detection, the over-current detection circuit 140
Output terminal OCP exports non-overcurrent protection signal.In one embodiment, the voltage threshold of the over-current detection can be designed as
10mV~200mV.In a preferred embodiment, the voltage protection threshold value of the over-current detection can be designed as 50mV, right
The current protection threshold value for the over-current detection answered is 1 ampere.
The first input end of the logic control circuit 150 is connected with the output terminal OCP of over-current detection circuit 140, the
Two input terminals are connected with the output terminal BATH of the low-voltage testing circuit 110, the output terminal GN1 and discharge switch pipe MN1
Control terminal be connected, the logic control circuit 150 is for ought at least receive in overcurrent protection signal and low-voltage variation signal
One when, by its output terminal GN1 export shutdown control signal so that the discharge switch pipe MN1 disconnect；It is non-when receiving
Overcurrent protection signal and when receiving non-low-voltage variation signal, exports conductivity control signal, so that described by its output terminal GN1
Discharge switch pipe MN1 is opened.
In the embodiment shown in fig. 1, the logic control circuit 150 include phase inverter INV1 and with door And1, it is described
The input terminal of phase inverter INV1 is connected with the first input end of the logic control circuit 150, the output of the reverser INV1
It holds and is connected with the second input terminal 2 of door And1, the first input end 1 with door And1 and the logic control circuit 150
The second input terminal be connected, it is described to be connected with the output terminal of door And1 with the output terminal of the logic control circuit 150.In Fig. 1
In shown embodiment, the discharge switch pipe MN1 is NMOS transistor, and the first connecting pin of the discharge switch MN1 is source
Pole, second connection end are drain electrode, and control terminal is grid.
For the ease of understanding the present invention, specifically introduced below based on Fig. 1, when discharge module 200 is connected to the first power end P
+ between the P- of second source end when, the course of work of the battery protecting circuit 100.In the embodiment illustrated in fig. 1, low pressure
The low-voltage variation signal that detection circuit 110 exports is low level, and non-low-voltage variation signal is high level；Over-current detection circuit 140
The overcurrent protection signal of output is high level, and non-overcurrent protection signal is low level；The pass that the logic control circuit 150 exports
Disconnected control signal is low level, and conductivity control signal is high level.
When the voltage of battery core BT1 is less than the low pressure detection threshold value, the BATH signals that low-voltage testing circuit 110 exports are jumped
Become low level (it is low-voltage variation signal), control switch K1 is disconnected, and cuts through the leakage path of resistance R4；BATH signals
For low level, by also be that (it be that shutdown is controlled and believed to low level with GN1 signals that after door And1, logic control circuit 140 exports
Number), guiding discharge switching tube MN1 is off, and the current path of discharge module 200 is cut off；When discharge switch pipe pipe
When the drain voltage of MN1 is more than the voltage protection threshold value of over-current detection, the OCP signals that over-current detection circuit 140 exports will become
High level (it is overcurrent protection signal), which becomes low level after phase inverter INV1, causes defeated with door And1
Outlet GN1 is low level, is off discharge switch pipe MN1, and the current path of discharge module 200 is cut off, so as to
Realize the defencive function of total ban electric discharge.
In summary, since the present invention is additionally arranged discharge switch pipe MN1, over-current detection circuit on the basis of existing technology
140 and logic control circuit 150, wherein, discharge switch pipe MN1 and discharge module 200 are sequentially connected in series in the positive and negative anodes of battery core BT1
Between, and detect that the brownout of battery core BT1 and/or over-current detection circuit 140 detect battery core BT1 in low-voltage testing circuit
During overcurrent of discharging, the control shutdown discharge switch pipe MN1 of logic control circuit 150, to cut off the current path of discharge module 200,
Realize the defencive function of total ban electric discharge.
In order to reduce the power attenuation of discharge switch pipe MN1, the smaller of resistive arrangement should be generally switched it on, for example, 1
The milliohm of milliohm~200.The resistance of discharge switch pipe MN1 is smaller, and power attenuation thereon is smaller；But resistance is smaller, required
Chip area it is bigger, cost is higher.Consider some mainstream applications, in some preferred embodiments, discharge switch pipe MN1 is set
It is calculated as 50 milliohms.Voltage fluctuation is generated during the action of discharge switch pipe MN1 on and off in order to reduce, it generally should also be in the first power supply
Connection capacitance C1 between the P+ and second source end P- of end, so that discharge module 200, which works, more to be stablized.It is preferred at one
In embodiment, the over-current detection circuit 140 further includes timing module (not shown), when the over-current detection circuit 140 detects
When discharging to overcurrent, the timing module starts timing, if the overcurrent discharge period of timing module record is more than pre- timing
Between, the output terminal COP ability output overcurrent protection signals of the over-current detection circuit 140.
In the embodiment illustrated in fig. 1, the improved battery protection circuit 100 is integrated on same chip；It is described
Capacitance is located at C1 and is located at outside the chip.In a preferred embodiment, pressure resistance may be used in the discharge switch pipe MN1 in Fig. 1
For device for 5V, which is because, in traditional technology, battery core protects the charge circuit of circuit and discharge loop common switch pipe,
Switching tube is caused to need to bear the issuable instantaneous pressure of charge circuit, the switching tube that therefore, it is necessary to select pressure resistance higher, example
Such as, 18V devices, and discharge switch pipe MN1 is only responsible for discharge loop in the present invention, pressure resistance can be reduced to 5V.Due to this hair
The resistance to pressure request to discharge switch pipe MN1 is reduced in bright, therefore, helps to save product cost.
It please refers to Fig.2 and shows, the circuit diagram for the battery protection system of the present invention in a preferred embodiment.Its
Difference lies in the battery protecting circuit 100 in Fig. 2 further includes the output terminal for being connected to logic control circuit 150 and puts with Fig. 1
Slope control circuit 180 between the control terminal of electric switch pipe MN1, the slope control circuit 180 can reduce discharge switch pipe
The speed that MN1 is disconnected or opened, during so as to reduce due to disconnecting or opening discharge switch pipe MN1, due to connecting discharge module 200
Ringing noise caused by parasitic inductance on access.Capacitance C1 can reduce and absorb this ring and make an uproar to a certain extent
Sound, if reducing the speed that discharge switch pipe MN1 is disconnected or opens, capacitance C1 can use the capacitance of small electric capacitance,
So as to reduce the requirement to capacitance C1.
Please continue to refer to shown in Fig. 1, the battery protecting circuit 100 in the present invention further includes：It charge management circuit 160 and fills
Electric switch pipe MP2.One end of charge switch pipe MP2 is connected with the anode of battery core BT1, other end connection charge power supply S1,
Control terminal is connected with the output terminal of charge management circuit 160.Wherein, charge power supply S1 can be data line USB power source or adaptation
Device Adapter power supplys.
Charge management circuit 160 is respectively connected with battery core BT1 and charge power supply S1, and the first of charge management circuit 160
Input terminal is connected with the anode of battery core BT1, and the second input terminal is connected with the anode VCHG of charge power supply S1, and output terminal is with filling
The control terminal of electric switch pipe MP1 is connected.Charge management circuit 160 is used to be higher than electricity as the voltage VCHG for detecting charge power supply S1
During the voltage VBAT of core BT1, the MP1 conductings of control charge switch pipe charge to battery core BT1.Charge switch pipe MP1 is insulation
Grid-type field-effect tube.
Optionally, battery protecting circuit 100 further includes：Substrate selection circuit 170.Substrate selection circuit 170, which is connected to, fills
The substrate of electric switch pipe MP2, and according to the substrate electricity of the working condition of charge switch pipe MP2 automatic switchover charge switch pipe MP2
Pressure.In general, generally there are four hold for MOS transistor：Source electrode, drain electrode, grid, substrate.In order to allow the normal work of PMOS transistor
Make, substrate terminal should connect high potential in drain electrode and source electrode, i.e., when drain voltage is more than source voltage, substrate should connect drain electrode electricity
Pressure, when source voltage is more than drain voltage, substrate should connect source voltage.
Being realized by charge management circuit 160 in the present invention charges to battery core BT1.When detecting USB or adaptation
When device Adapter is inserted into, charge to battery core BT1.The charging control process of charge management circuit 160 generally may include preliminary filling
Electricity, constant-current charge and constant-voltage charge.When the voltage of battery core BT1 is less than pre-charge threshold (such as 3V), charging circuit is with smaller
Pre-charge current charge the battery, 1/10th of constant-current charge electric current generally set.When the voltage of battery core BT1
When rising to more than pre-charge threshold, the constant-current charge electric current of charging circuit output setting charges to battery core BT1.Work as battery core
When BT1 charges to constant-voltage charge threshold value (for example, 4.2), constant-voltage charge is carried out to battery core BT1, and charging current is gradually reduced, directly
It is full of to battery.The constant-voltage charge threshold value of charge management circuit 160 in the present invention will be set than battery charging overvoltage protection threshold
It is worth low.For precharge, constant-current charge and constant-voltage charge detailed control method as known to those skilled in the art, in this not
It repeats again.
In the present invention, the word that the expressions such as " connection ", connected, " company ", " connecing " are electrical connected, unless otherwise instructed, then
Represent direct or indirect electric connection.
It should be pointed out that any change that one skilled in the art does the specific embodiment of the present invention
All without departing from the range of claims of the present invention.Correspondingly, the scope of the claims of the invention is also not merely limited to
In previous embodiment.
Claims (11)
1. a kind of improved battery protects circuit, which is characterized in that it includes low-voltage testing circuit, switch, discharge switch pipe, mistake
Current detection circuit and logic control circuit,
One end of the switch is connected with one end of starting key, and the other end of the switch is connected with the cathode of battery core, described
The other end of starting key is connected with the anode of battery core；
The input terminal of the low-voltage testing circuit is connected with the anode of battery core, and output terminal is connected with the control terminal of the switch,
Whether the low-voltage testing circuit is used to detect the voltage of battery core less than low pressure detection threshold value, when the voltage for detecting battery core is less than
During the low pressure detection threshold value, the output terminal output low-voltage variation signal of the low-voltage testing circuit is disconnected with control switch；When
When detecting that the voltage of battery core is higher than the low pressure detection threshold value, the output terminal of the low-voltage testing circuit exports non-low-voltage variation
Signal is opened with control switch,
First connecting pin of the discharge switch pipe is connected with the cathode of battery core, and second connection end is connected with second source end,
First power end is connected with the anode of battery core；
The over-current detection circuit for detecting battery core, whether discharge by overcurrent, when detecting that battery core is in overcurrent discharge condition,
The output terminal output overcurrent protection signal of the over-current detection circuit；When detecting that battery core is in non-overcurrent discharge condition, institute
The output terminal for stating over-current detection circuit exports non-overcurrent protection signal；
The first input end of the logic control circuit is connected with the output terminal of over-current detection circuit, the second input terminal with it is described
The output terminal of low-voltage testing circuit is connected, and output terminal is connected with the control terminal of the discharge switch pipe, the logic control electricity
Road is used for when at least receiving one in overcurrent protection signal and low-voltage variation signal, and shutdown control is exported by its output terminal
Signal processed, so that the discharge switch pipe disconnects；When receiving non-overcurrent protection signal and receiving non-low-voltage variation signal,
Conductivity control signal is exported by its output terminal, so that the discharge switch pipe is opened.
2. improved battery according to claim 1 protects circuit, which is characterized in that
The input terminal of the over-current detection circuit is connected with the first connecting pin of the discharge switch pipe, when over-current detection electricity
When road detects that the voltage of the first connecting pin of discharge switch pipe is higher than the voltage threshold of over-current detection, the over-current detection circuit
Output terminal output overcurrent protection signal；When the over-current detection circuit detects the voltage of the first connecting pin of discharge switch pipe
Less than over-current detection voltage threshold when, the output terminal of the over-current detection circuit exports non-overcurrent protection signal,
Discharge module is connected between first power end and second source end.
3. improved battery according to claim 2 protects circuit, which is characterized in that
The voltage threshold of the over-current detection is 10mV~200mV；
The resistance of the discharge switch pipe is the milliohm of 1 milliohm~200.
4. improved battery according to claim 1 protects circuit, which is characterized in that
The discharge switch pipe is NMOS transistor, and the first connecting pin of the discharge switch pipe is source electrode, and second connection end is
Drain electrode, control terminal are grid；
The improved battery protection circuit further includes the capacitance being connected between the first power end and second source end.
5. improved battery according to claim 1 protects circuit, which is characterized in that its further include booting detection circuit and
Electric power management circuit,
The booting detection circuit is used to, when at least one of switch and starting key are off, pass through its output
Hold out-put supply cut-off signals；When switch and starting key are opened, pass through its output terminal out-put supply Continuity signal；
The electric power management circuit is connected with the output terminal of the booting detection circuit, and the electric power management circuit is used for when reception
To it is described booting detection circuit output power-down signal when, cut off the discharge path controlled by electric power management circuit；When connecing
When receiving the power supply Continuity signal of the booting detection circuit output, the discharge path controlled by electric power management circuit is connected.
6. improved battery according to claim 5 protects circuit, which is characterized in that it, which is further included, is connected to the switch
The other end and battery core cathode between resistance,
The input terminal of the booting detection circuit is connected with the connecting node between switch and resistance,
The booting detection circuit is used to, when the voltage of the connecting node between switch and resistance is less than booting detection threshold value, lead to
Cross its output terminal out-put supply cut-off signals；When the voltage of the connecting node between switch and resistance is more than booting detection threshold value
When, pass through its output terminal out-put supply Continuity signal.
7. improved battery according to claim 6 protects circuit, feature exists,
The improved battery protection circuit is integrated on same chip,
Capacitance is connected between first power end and second source end, the capacitance is located at outside the chip；
The discharge switch pipe is the resistance to voltage devices of 5V.
8. improved battery according to claim 7 protects circuit, which is characterized in that it, which is further included, is connected to logic control
Slope control circuit between the output terminal of circuit and the control terminal of discharge switch pipe, the slope control circuit is for reducing electric discharge
The speed that switching tube is disconnected or opened；
The over-current detection circuit further includes timing module, when the over-current detection circuit detects that the first of discharge switch pipe connects
When connecing the voltage at end and being higher than the voltage threshold of over-current detection, expression detects that overcurrent is discharged, and the timing module starts timing, if
The overcurrent discharge period of timing module record is more than the predetermined time, and the output terminal output overcurrent of the over-current detection circuit is protected
Protect signal.
9. improved battery according to claim 6 protects circuit, which is characterized in that its further include charge management circuit,
Charge switch pipe and substrate selection circuit,
One end of the charge switch pipe is connected with the anode of the battery core, and the other end is connected with charge power supply, control terminal
It is connected with the output terminal of the charge management circuit；
The first input end of the charge management circuit is connected with the anode of battery core, and the second input terminal is connected with charge power supply,
The charge management circuit is used to, when the voltage for detecting the charge power supply is more than the voltage of the battery core, fill described in control
The conducting of electric switch pipe charges to the battery core；
The substrate selection circuit is connected to the substrate of the charge switch pipe, and according to the working condition of the charge switch pipe
Automatically switch the underlayer voltage of the charge switch pipe.
10. a kind of battery protection system, which is characterized in that the system comprises battery core and as described in claim 1-9 is any
Improved battery protects circuit.
11. battery protection system according to claim 10, which is characterized in that
Discharge module is connected between the first power end and second source end,
The discharge module includes the audio power amplifier circuit of Baffle Box of Bluetooth.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610215078.4A CN105680422B (en) | 2016-04-07 | 2016-04-07 | Improved battery protects circuit and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610215078.4A CN105680422B (en) | 2016-04-07 | 2016-04-07 | Improved battery protects circuit and system |
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| CN105680422B true CN105680422B (en) | 2018-06-15 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063428B (en) * | 2017-09-23 | 2019-07-12 | 华为技术有限公司 | A kind of apparatus for protecting power supply and the terminal using described device |
| CN109050259A (en) * | 2018-07-19 | 2018-12-21 | 上海汽车集团股份有限公司 | Electric car relay safety control and method based on battery core administrative unit |
| CN109239449A (en) * | 2018-11-22 | 2019-01-18 | 中国电子科技集团公司第五十八研究所 | A kind of over-current detection circuit |
| CN110011378A (en) * | 2019-04-19 | 2019-07-12 | 深圳市山河动力电子有限公司 | A kind of lithium battery protection board overcurrent detection protection circuit |
| CN110445099B (en) * | 2019-08-06 | 2020-10-23 | 苏州赛芯电子科技有限公司 | Semiconductor structure of integrated battery protection circuit and manufacturing process thereof |
| TWI762972B (en) * | 2020-07-15 | 2022-05-01 | 宏碁股份有限公司 | Battery management device and method thereof |
| CN112582984B (en) * | 2021-02-23 | 2021-05-07 | 苏州赛芯电子科技股份有限公司 | Quick turn-off circuit and lithium battery protection system thereof |
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