CN105680422A - Improved battery protection circuit and system - Google Patents
Improved battery protection circuit and system Download PDFInfo
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- CN105680422A CN105680422A CN201610215078.4A CN201610215078A CN105680422A CN 105680422 A CN105680422 A CN 105680422A CN 201610215078 A CN201610215078 A CN 201610215078A CN 105680422 A CN105680422 A CN 105680422A
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- battery core
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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 invention provides an improved battery protection circuit and system. The improved battery protection circuit comprises a low voltage detection circuit, a switch, a discharging switch tube, an overcurrent detection circuit and a logic control circuit. The switch is connected between one end of a power-on button and the cathode of an electrical core, and the other end of the power-on button is connected with the anode of the electrical core; the input end of the low voltage detection circuit is connected with the electrical core, and the output end of the low voltage detection circuit is connected with the control end of the switch; a first connecting end of the discharging switch tube is connected with the cathode of the electrical core, a second connecting end of the discharging switch tube is connected with a second power end, and a first power end is connected with the anode of the electrical core; and the first input end of the logic control circuit is connected with the output end of the overcurrrent detection circuit, the second input end of the logic control circuit is connected with the output end of the low voltage detection circuit, and the output end of the logic control circuit is connected with the control end of the discharging switch tube. Compared with the prior art, a battery can be completely protected if there is a discharging module which takes electricity from the electrical core directly in the system.
Description
[technical field]
The present invention relates to battery protection technical field, particularly to a kind of improved battery protection circuit and system.
[background technology]
A kind of novel battery of the prior art protection circuit and system are to less electronic system, for instance bluetooth earphone, all of system is integrated in on a chip, and all of system power supply is all monitored by this chip, and its battery protection function is complete. But some increasingly complex system; such as Baffle Box of Bluetooth; sometimes user needs special high-power driving; in order to improve the output volume of Baffle Box of Bluetooth, it is necessary to additionally increase audio frequency power amplifier, and this audio power amplifier circuit power consumption is bigger; existing highly integrated chip generally cannot export so big electric current; if this audio power amplifier circuit is directly from battery electricity-taking, when battery is in overvoltage discharge condition or excessively banishes electricity condition, it is impossible to realize forbidding the protection act of electric discharge.
Therefore, it is necessary to protect circuit and system to improve existing novel battery.
[summary of the invention]
It is an object of the invention to provide a kind of improved battery protection circuit and system, when existing in systems directly from the discharge module of battery core power taking, it can realize the defencive function that battery is complete.
In order to solve the problems referred to above, according to an aspect of the present invention, the present invention provides a kind of improved battery protection circuit, and it includes low-voltage testing circuit, switch, discharge switch pipe, over-current detection circuit and logic control circuit. One end of described switch is connected with one end of starting key, and the other end of described switch is connected with the negative pole of battery core, and the other end of described starting key is connected with the positive pole of battery core; The input of described low-voltage testing circuit is connected with battery core, its outfan is connected with the control end of described switch, whether described low-voltage testing circuit detects threshold value lower than low pressure for the voltage detecting battery core, when voltage battery core being detected detects threshold value lower than described low pressure, the outfan output low-voltage variation signal of described low-voltage testing circuit, to control to switch off; When voltage battery core being detected detects threshold value higher than described low pressure, the outfan of described low-voltage testing circuit exports non-low-voltage variation signal, to control switch open, first link of described discharge switch is connected with the negative pole of battery core, its second link is connected with second source end, and the first power end is connected with the positive pole of battery core; Whether described over-current detection circuit is used for detecting battery core and crosses and banish electricity, when detect battery core be in banish electricity condition time, the outfan output overcurrent protection signal of described over-current detection circuit; When detect battery core be in non-mistake banish electricity condition time, the outfan of described over-current detection circuit exports non-overcurrent protection signal; The first input end of described logic control circuit is connected with the outfan of over-current detection circuit, its second input is connected with the outfan of described low-voltage testing circuit, its outfan is connected with the control end of described discharge switch pipe, described logic control circuit is for when one at least received in overcurrent protection signal and low-voltage variation signal, control signal is turned off, so that described discharge switch pipe disconnects by the output of its outfan; When receiving non-overcurrent protection signal and receiving non-low-voltage variation signal, export conductivity control signal by its outfan, so that described discharge switch pipe is opened.
Further, the input of described over-current detection circuit is connected with the first link of described discharge switch pipe, when described over-current detection circuit detects the voltage threshold that the voltage of the first link of discharge switch pipe is higher than over-current detection, the outfan output overcurrent protection signal of described over-current detection circuit; When described over-current detection circuit detects the voltage of the first link of discharge switch lower than the voltage threshold of over-current detection; the outfan of described over-current detection circuit exports non-overcurrent protection signal, can connect discharge module between described first power end and second source end.
Further, the voltage threshold of described over-current detection is 10mV～200mV; The resistance of described discharge switch pipe is 1 milliohm～200 milliohm.
Further, described discharge switch pipe is nmos pass transistor, and the first link of described discharge switch is source electrode, and the second link is drain electrode, and it controls end is grid; Described improved battery protection circuit also includes the electric capacity being connected between the first power end and second source end.
Further, described improved battery protection circuit also includes start testing circuit and electric power management circuit,
Described start testing circuit is for when at least one in switch and starting key is off, by its outfan out-put supply cut-off signals; When switch and starting key are all opened, by its outfan out-put supply Continuity signal; Described electric power management circuit is connected with the outfan of described start testing circuit, and described electric power management circuit is for when receiving the power-down signal of described start testing circuit output, cutting off the discharge path controlled by electric power management circuit; When receiving the power supply Continuity signal of described start testing circuit output, the discharge path that connection is controlled by electric power management circuit.
Further, described improved battery protection circuit also includes the resistance being connected between the other end and the negative pole of battery core of described switch, the input of described start testing circuit is connected with the connection node between switch and resistance, when described start testing circuit detects threshold value for the voltage connecting node between switch and resistance less than start, manage signal by its outfan out-put supply; When the voltage connecting node between switch and resistance is more than start detection threshold value, by its outfan out-put supply cut-off signals.
Further, described improved battery protection circuit is integrated on same chip, is connected to electric capacity between the first power end and second source end, and described electric capacity is positioned at outside described chip; Described discharge switch pipe is the resistance to voltage device of 5V.
Further, described improved battery protection circuit also includes the slope control circuit controlled between end of outfan and the discharge switch pipe being connected to logic control circuit, and this slope control circuit is for reducing the speed that discharge switch pipe disconnects or opens; Described over-current detection circuit also includes timing module; when described over-current detection circuit detects the voltage threshold that the voltage of the first link of discharge switch pipe is higher than over-current detection; expression detected banishes electricity; described timing module starts timing; if the stream discharge period that crosses of timing module record exceedes the scheduled time, the outfan output overcurrent protection signal of described over-current detection circuit.
Further, described improved battery protection circuit also includes charge management circuit, charge switch pipe and substrate selection circuit, one end of described charge switch pipe is connected with described battery core, and its other end is connected with charge power supply, and it controls end and is connected with the outfan of described charge management circuit; The first input end of described charge management circuit is connected with battery core, its second input is connected with charge power supply, described charge management circuit is for when the voltage of described charge power supply being detected more than the voltage of described battery core, controlling the conducting of described charge switch pipe and described battery core is charged; Described substrate selection circuit is connected to the substrate of described charge switch pipe the underlayer voltage of the duty practical described charge switch pipe automatically according to described charge switch pipe.
According to another aspect of the present invention; the present invention provides a kind of battery protection system; it includes secondary battery core and improved battery protection circuit, and described improved battery protection circuit includes low-voltage testing circuit, switch, discharge switch pipe, over-current detection circuit and logic control circuit. One end of described switch is connected with one end of starting key, and the other end of described switch is connected with the negative pole of battery core, and the other end of described starting key is connected with the positive pole of battery core; The input of described low-voltage testing circuit is connected with battery core, its outfan is connected with the control end of described switch, whether described low-voltage testing circuit detects threshold value lower than low pressure for the voltage detecting battery core, when voltage battery core being detected detects threshold value lower than described low pressure, the outfan output low-voltage variation signal of described low-voltage testing circuit, to control to switch off; When voltage battery core being detected detects threshold value higher than described low pressure, the outfan of described low-voltage testing circuit exports non-low-voltage variation signal, to control switch open, first link of described discharge switch is connected with the negative pole of battery core, its second link is connected with second source end, and the first power end is connected with the positive pole of battery core; Whether described over-current detection circuit is used for detecting battery core and crosses and banish electricity, when detect battery core be in banish electricity condition time, the outfan output overcurrent protection signal of described over-current detection circuit; When detect battery core be in non-mistake banish electricity condition time, the outfan of described over-current detection circuit exports non-overcurrent protection signal; The first input end of described logic control circuit is connected with the outfan of over-current detection circuit, its second input is connected with the outfan of described low-voltage testing circuit, its outfan is connected with the control end of described discharge switch pipe, described logic control circuit is for when one at least received in overcurrent protection signal and low-voltage variation signal, control signal is turned off, so that described discharge switch pipe disconnects by the output of its outfan; When receiving non-overcurrent protection signal and receiving non-low-voltage variation signal, export conductivity control signal by its outfan, so that described discharge switch pipe is opened.
Further, being connected to discharge module between the first power end and second source end, described discharge module includes the audio power amplifier circuit of Baffle Box of Bluetooth.
Compared with prior art; the present invention protects at existing novel battery and sets up discharge switch pipe on the basis of circuit; this discharge switch pipe and heavy-current discharge module are sequentially connected between the both positive and negative polarity of battery core; when detecting that battery core is in electric discharge over-current state or electric discharge overvoltage condition; discharge switch pipe is turned off; thus when existing in systems directly from the discharge module of battery core power taking, it is achieved the defencive function that battery is complete.
[accompanying drawing explanation]
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings. Wherein:
Fig. 1 is the circuit diagram of present invention battery protection system in one embodiment;
Fig. 2 is the circuit diagram of present invention battery protection system in a preferred embodiment.
[detailed description of the invention]
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
" embodiment " or " embodiment " referred to herein refers to the special characteristic, structure or the characteristic that may be included at least one implementation of the present invention. Different local in this manual " in one embodiment " occurred not refer both to same embodiment, neither be independent or selective and that other embodiments are mutually exclusive embodiment. Unless stated otherwise, connection herein, be connected, connect represent that the word being electrically connected all represents and be directly or indirectly electrical connected.
Refer to shown in Fig. 1, it is the circuit diagram of present invention battery protection system in one embodiment. Battery protection system shown in Fig. 1 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, start testing circuit 120, electric power management circuit 130 and switch K1.
One end of described switch K1 is connected with one end of starting key Button, and the other end of described switch K1 is connected by the negative pole of resistance R4 and battery core BT1, and the other end of starting key Button is connected with the positive pole of battery core BT1.
The described input of low-voltage testing circuit 110 is connected with the positive pole of battery core BT1, its outfan is connected with the control end of described switch K1, whether described low-voltage testing circuit 110 detects threshold value lower than low pressure for the voltage detecting battery core BT1, when voltage battery BT1 being detected detects threshold value lower than described low pressure, the outfan BATH of described low-voltage testing circuit 110 exports low-voltage variation signal, to control switch K1 disconnection, thus cutting through the leakage path of resistance R4; When voltage battery BT1 being detected detects threshold value higher than described low pressure, the outfan BATH of described low-voltage testing circuit 110 exports non-low-voltage variation signal, to control switch K1 unlatching. In one embodiment; described low pressure detection threshold value is designed to the overvoltage discharge prevention threshold value more than or equal to described battery core BT1; and less than the minimum running voltage of system (such as; value between 2.0V～2.9V); during to avoid battery core BT1 brownout; owing to over-discharge causes battery loss, this low-voltage testing circuit 110 is always maintained at work. Described low-voltage variation signal and non-low-voltage variation signal can be two kinds of logic states of a signal, and such as, described low-voltage variation signal is low level, and described non-low-voltage variation signal is high level.
Described start testing circuit 120 is for when at least one switch in K1 and starting key Button is off, by its outfan ON out-put supply cut-off signals; When switching K1 and starting key Button and all opening, by its outfan ON out-put supply Continuity signal. Described power-down signal and power supply Continuity signal can be two kinds of logic states of a signal, and such as, described power-down signal is low level, and described power supply Continuity signal is high level.
Described electric power management circuit 130 is connected with the outfan of described start testing circuit 120, and the power end of electric power management circuit 130 is connected with the positive pole of battery core BT1, described electric power management circuit 130 is for when receiving the power-down signal of described start testing circuit 120 output, cut off the discharge path controlled by electric power management circuit 130, forbid that battery core BT1 is discharged by this discharge path; When receiving the power supply Continuity signal of described start testing circuit 120 output, the discharge path that connection is controlled by electric power management circuit 130. Described electric power management circuit 130 can include in DC-to-DC converter, voltage regulator, power switch, electric charge pump or combination in any, in order to when battery core BT1 occurs abnormal, can forbid that battery core BT1 discharges, thus realizing battery protection function.
In the embodiment shown in fig. 1, the connection node between the input KON of described start testing circuit 120 with switch K1 and resistance R4 is connected, and its outfan ON is connected with electric power management circuit 130, and its power end is connected with the positive pole of battery core BT1. When the voltage of battery core BT1 detects threshold value lower than described low pressure, low-voltage testing circuit 110 exports low-voltage variation signal by its outfan BATH, controls switch K1 and disconnects, cuts through the leakage path of resistance R4. Simultaneously by roof-cut resistence K1, resistance R4 can by the voltage pull-down of the input KON of start testing circuit 120, make the voltage of input KON lower than start detection threshold value, so that start testing circuit 120 is by its outfan BATH out-put supply cut-off signals, so that electric power management circuit 130 cuts off the discharge path controlled by electric power management circuit 130, it is to avoid the over-discharge to battery core BT1. So, when the voltage of battery core BT1 detects threshold value lower than described low pressure, even if button Buttom is pressed by false triggering (such as, during transport), the excessive power consumption problem to battery core BT1 is produced without occurring chip to be worked by false triggering. Meanwhile, false triggering causes that battery core BT1 is also turned off by the resistance R4 leak channel discharged, such that it is able to when realizing battery core BT1 brownout, reduce the effect of electric leakage.
Once mention in the introduction, the system of some complexity, such as Baffle Box of Bluetooth, sometimes user needs special high-power driving, in order to improve the output volume of Baffle Box of Bluetooth, need additionally to increase audio frequency power amplifier (or heavy-current discharge module), and this audio power amplifier circuit power consumption is bigger, need audio power amplifier circuit directly from battery core BT1 power taking, when battery core BT1 is in overvoltage discharge condition or excessively banishes electricity condition, for realizing total ban discharge prevention, battery protecting circuit 100 in Fig. 1 also has additional discharge switch pipe MN1, over-current detection circuit 140 and logic control circuit 150.
First link of described discharge switch pipe MN1 is connected with the negative pole of battery core BT1, its second link is connected with second source end P-, the positive pole of the first power end P+ and battery core BT1 is connected, and discharge module 200 is connected between the first power end P+ and second source end P-. When discharge switch MN1 is unlocked, discharge module 200 can directly be powered by battery core BT1; When discharge switch MN1 is disconnected, cut off the battery core BT1 discharge path to discharge module 200. In one embodiment, described discharge module 200 includes the audio power amplifier circuit of Baffle Box of Bluetooth.
Whether described over-current detection circuit 140 is used for detecting battery core BT1 and crosses and banish electricity, when detect battery core BT1 be in banish electricity condition time, the outfan COP output overcurrent protection signal of described over-current detection circuit 140; When detect battery core BT1 be in non-mistake banish electricity condition time, the outfan COP of described over-current detection circuit 140 exports non-overcurrent protection signal. In the embodiment shown in fig. 1, the input of described over-current detection circuit 140 is connected with first link of described discharge switch pipe MN1, when described over-current detection circuit 140 detects the voltage threshold that the voltage of first link of discharge switch pipe MN1 is higher than over-current detection, the outfan OCP output overcurrent protection signal of described over-current detection circuit 140; When described over-current detection circuit 140 detects the voltage of first link of discharge switch MN1 lower than the voltage threshold of over-current detection, the outfan OCP of described over-current detection circuit 140 exports non-overcurrent protection signal. In one embodiment, the voltage threshold of described over-current detection can be designed as 10mV～200mV. In a preferred embodiment, the voltage protection threshold value of described over-current detection can be designed as 50mV, and the current protection threshold value of corresponding over-current detection is 1 ampere.
The first input end of described logic control circuit 150 is connected with the outfan OCP of over-current detection circuit 140, its second input is connected with the outfan BATH of described low-voltage testing circuit 110, the control end of its outfan GN1 and described discharge switch pipe MN1 is connected, described logic control circuit 150 is for when one at least received in overcurrent protection signal and low-voltage variation signal, control signal is turned off, so that described discharge switch pipe MN1 disconnects by its outfan GN1 output; When receiving non-overcurrent protection signal and receiving non-low-voltage variation signal, export conductivity control signal by its outfan GN1, so that described discharge switch pipe MN1 opens.
In the embodiment shown in fig. 1, described logic control circuit 150 include phase inverter INV1 and with door And1, the input of described phase inverter INV1 is connected with the first input end of described logic control circuit 150, the outfan of described reverser INV1 and being connected with second input 2 of door And1, described and the first input end 1 of door And1 with described logic control circuit 150 the second input is connected, and described and the outfan of door And1 with described logic control circuit 150 outfan is connected. In the embodiment shown in fig. 1, described discharge switch pipe MN1 is nmos pass transistor, and first link of described discharge switch MN1 is source electrode, and the second link is drain electrode, and it controls end is grid.
For the ease of understanding the present invention, specifically introduce below based on Fig. 1, when discharge module 200 is connected between the first power end P+ and second source end P-, the work process of described battery protecting circuit 100. In the embodiment illustrated in fig. 1, the low-voltage variation signal of low-voltage testing circuit 110 output is low level, and non-low-voltage variation signal is high level; The overcurrent protection signal of over-current detection circuit 140 output is high level, and non-overcurrent protection signal is low level; The shutoff control signal of described logic control circuit 150 output is low level, and conductivity control signal is high level.
When the voltage of battery core BT1 detects threshold value lower than described low pressure, the BATH signal saltus step of low-voltage testing circuit 110 output is low level (it is low-voltage variation signal), controls switch K1 and disconnects, cuts through the leakage path of resistance R4; BATH signal is low level, through with door And1 after, the GN1 signal of logic control circuit 140 output also be low level (its for turn off control signal), and guiding discharge switching tube MN1 is off, and the current path of discharge module 200 is cut-off; When the drain voltage of discharge switch pipe pipe MN1 is more than the voltage protection threshold value of over-current detection; the OCP signal of over-current detection circuit 140 output will become high level (it is overcurrent protection signal); this high level becomes low level after phase inverter INV1; cause that the outfan GN1 with door And1 is low level; discharge switch pipe MN1 is made to be off; the current path of discharge module 200 is cut off, thus realizing the defencive function of total ban electric discharge.
In summary; discharge switch pipe MN1, over-current detection circuit 140 and logic control circuit 150 it is additionally arranged on the basis of existing technology due to the present invention; wherein; discharge switch pipe MN1 and discharge module 200 are sequentially connected in series between the both positive and negative polarity of battery core BT1; and low-voltage testing circuit detect the brownout of battery core BT1 and/or over-current detection circuit 140 detect battery core BT1 discharged stream time; logic control circuit 150 controls to turn off discharge switch pipe MN1; to cut off the current path of discharge module 200, it is achieved the defencive function of total ban electric discharge.
In order to reduce the power attenuation of discharge switch pipe MN1, the less of resistive arrangement generally should be switched it on, for instance, 1 milliohm～200 milliohm. The resistance of discharge switch pipe MN1 is more little, and power attenuation thereon is more little; But resistance is more little, required chip area is more big, and cost is more high. Considering some mainstream applications, in some preferred embodiments, discharge switch pipe MN1 is designed as 50 milliohms. In order to produce voltage pulsation when reducing discharge switch pipe MN1 on an off action, generally also should connect electric capacity C1 between the first power end P+ and second source end P-, so make discharge module 200 work more stable. In a preferred embodiment; described over-current detection circuit 140 also includes timing module (not shown); when described over-current detection circuit 140 detected and banished electricity; described timing module starts timing; if the stream discharge period that crosses of timing module record exceedes the scheduled time, the outfan COP of described over-current detection circuit 140 is output overcurrent protection signal.
In the embodiment illustrated in fig. 1, described improved battery protection circuit 100 is integrated on same chip; Described electric capacity is positioned at C1 and is positioned at outside this chip. In a preferred embodiment; discharge switch pipe MN1 in Fig. 1 can adopt the pressure device for 5V, and its reason is in that, in conventional art; the charge circuit of battery core protection circuit and discharge loop common switch pipe; cause that switching tube needs to bear the issuable instantaneous pressure of charge circuit, accordingly, it would be desirable to select pressure higher switching tube; such as; 18V device, and in the present invention, discharge switch pipe MN1 is only responsible for discharge loop, it is pressure can be reduced to 5V. Owing to the present invention reducing the resistance to pressure request to discharge switch pipe MN1, therefore, contribute to saving product cost.
Refer to Fig. 2 to show, it is the circuit diagram of present invention battery protection system in a preferred embodiment. Itself and Fig. 1 are distinctive in that; battery protecting circuit 100 in Fig. 2 also includes the slope control circuit 180 controlled between end of outfan and the discharge switch pipe MN1 being connected to logic control circuit 150; this slope control circuit 180 can reduce the discharge switch pipe MN1 speed disconnecting or opening; thus when reducing owing to disconnecting or opening discharge switch pipe MN1, the ringing noise caused due to the stray inductance on connection discharge module 200 path. Electric capacity C1 can reduce and absorb this ringing noise to a certain extent, if reducing the discharge switch pipe MN1 speed being disconnected or opening, electric capacity C1 just can adopt the electric capacity of small electric capacitance, such that it is able to reduce the requirement to electric capacity C1.
Shown in Fig. 1, the battery protecting circuit 100 in the present invention also includes: charge management circuit 160 and charge switch pipe MP2. One end of charge switch pipe MP2 is connected with the positive pole of battery core BT1, and its other end connects charge power supply S1, and it controls end and is connected with the outfan of charge management circuit 160. Wherein, charge power supply S1 can be data wire USB power source or adapter Adapter power supply.
Charge management circuit 160 and battery core BT1 and charge power supply S1 are respectively connected with, the first input end of charge management circuit 160 is connected with the positive pole of battery core BT1, its second input is connected with the positive pole VCHG of charge power supply S1, and its outfan is connected with the control end of charge switch pipe MP1. Charge management circuit 160 is used for, when voltage VCHG charge power supply S1 being detected is higher than the voltage VBAT of battery core BT1, controlling charge switch pipe MP1 conducting and battery core BT1 being charged. Charge switch pipe MP1 is insulating gate type field effect tube.
Optionally, battery protecting circuit 100 also includes: substrate selection circuit 170. Substrate selection circuit 170 is connected to the substrate of charge switch pipe MP2 the underlayer voltage of the duty automatic switchover charge switch pipe MP2 according to charge switch pipe MP2. In general, MOS transistor generally has four ends: source electrode, drain electrode, grid, substrate. In order to allow PMOS transistor normal operation, its substrate terminal should connect high potential in drain electrode and source electrode, and namely when drain voltage is more than source voltage, substrate should connect drain voltage, and when source voltage is more than drain voltage, substrate should connect source voltage.
The present invention realizes battery core BT1 is charged by charge management circuit 160. When detecting that USB or adapter Adapter inserts, battery core BT1 is charged. The charging control process of charge management circuit 160 generally can include precharge, constant-current charge and constant-voltage charge. When the voltage of battery core BT1 is lower than pre-charge threshold (such as 3V), battery is charged by charging circuit with less pre-charge current, be generally setting constant-current charge electric current 1/10th. When the voltage of battery core BT1 rises to more than pre-charge threshold, battery core BT1 is charged by the constant-current charge electric current that charging circuit output sets. When battery core BT1 charges to constant-voltage charge threshold value (such as, 4.2), battery core BT1 is carried out constant-voltage charge, and charging current is gradually reduced, until battery is full of. The constant-voltage charge threshold value of the charge management circuit 160 in the present invention to set lower than battery charging overvoltage protection threshold value. For precharge, constant-current charge and constant-voltage charge detailed control method known by those skilled in the art, repeat no more in this.
In the present invention, " connection ", be connected, word that " company ", the expression such as " connecing " are electrical connected, if no special instructions, then it represents that direct or indirect electric connection.
It is pointed out that any change that the specific embodiment of the present invention done by one skilled in the art scope all without departing from claims of the present invention. Correspondingly, the scope of the claims of the present invention is also not limited only to previous embodiment.
Claims (11)
1. an improved battery protection circuit, it is characterised in that it includes low-voltage testing circuit, switch, discharge switch pipe, over-current detection circuit and logic control circuit,
One end of described switch is connected with one end of starting key, and the other end of described switch is connected with the negative pole of battery core, and the other end of described starting key is connected with the positive pole of battery core;
The input of described low-voltage testing circuit is connected with battery core, its outfan is connected with the control end of described switch, whether described low-voltage testing circuit detects threshold value lower than low pressure for the voltage detecting battery core, when voltage battery core being detected detects threshold value lower than described low pressure, the outfan output low-voltage variation signal of described low-voltage testing circuit, to control to switch off; When voltage battery core being detected detects threshold value higher than described low pressure, the outfan of described low-voltage testing circuit exports non-low-voltage variation signal, to control switch open,
First link of described discharge switch is connected with the negative pole of battery core, and its second link is connected with second source end, and the first power end is connected with the positive pole of battery core;
Whether described over-current detection circuit is used for detecting battery core and crosses and banish electricity, when detect battery core be in banish electricity condition time, the outfan output overcurrent protection signal of described over-current detection circuit; When detect battery core be in non-mistake banish electricity condition time, the outfan of described over-current detection circuit exports non-overcurrent protection signal;
The first input end of described logic control circuit is connected with the outfan of over-current detection circuit, its second input is connected with the outfan of described low-voltage testing circuit, its outfan is connected with the control end of described discharge switch pipe, described logic control circuit is for when one at least received in overcurrent protection signal and low-voltage variation signal, control signal is turned off, so that described discharge switch pipe disconnects by the output of its outfan; When receiving non-overcurrent protection signal and receiving non-low-voltage variation signal, export conductivity control signal by its outfan, so that described discharge switch pipe is opened.
2. improved battery according to claim 1 protection circuit, it is characterised in that
The input of described over-current detection circuit is connected with the first link of described discharge switch pipe, when described over-current detection circuit detects the voltage threshold that the voltage of the first link of discharge switch pipe is higher than over-current detection, the outfan output overcurrent protection signal of described over-current detection circuit; When described over-current detection circuit detects the voltage of the first link of discharge switch lower than the voltage threshold of over-current detection, the outfan of described over-current detection circuit 1 exports non-overcurrent protection signal,
Discharge module can be connected between described first power end and second source end.
3. improved battery according to claim 2 protection circuit, it is characterised in that
The voltage threshold of described over-current detection is 10mV～200mV;
The resistance of described discharge switch pipe is 1 milliohm～200 milliohm.
4. improved battery according to claim 1 protection circuit, it is characterised in that
Described discharge switch pipe is nmos pass transistor, and the first link of described discharge switch is source electrode, and the second link is drain electrode, and it controls end is grid;
Described improved battery protection circuit also includes the electric capacity being connected between the first power end and second source end.
5. improved battery according to claim 1 protection circuit, it is characterised in that it also includes start testing circuit and electric power management circuit,
Described start testing circuit is for when at least one in switch and starting key is off, by its outfan out-put supply cut-off signals; When switch and starting key are all opened, by its outfan out-put supply Continuity signal;
Described electric power management circuit is connected with the outfan of described start testing circuit, and described electric power management circuit is for when receiving the power-down signal of described start testing circuit output, cutting off the discharge path controlled by electric power management circuit; When receiving the power supply Continuity signal of described start testing circuit output, the discharge path that connection is controlled by electric power management circuit.
6. improved battery according to claim 5 protection circuit, it is characterised in that it also includes the resistance being connected between the other end and the negative pole of battery core of described switch,
The input of described start testing circuit is connected with the connection node between switch and resistance,
When described start testing circuit detects threshold value for the voltage connecting node between switch and resistance less than start, manage signal by its outfan out-put supply; When the voltage connecting node between switch and resistance is more than start detection threshold value, by its outfan out-put supply cut-off signals.
7. improved battery according to claim 6 protection circuit, its feature exists,
Described improved battery protection circuit is integrated on same chip,
Being connected to electric capacity between first power end and second source end, described electric capacity is positioned at outside described chip;
Described discharge switch pipe is the resistance to voltage device of 5V.
8. improved battery according to claim 7 protection circuit, it is characterized in that, the slope control circuit controlled between end of its outfan also including being connected to logic control circuit and discharge switch pipe, this slope control circuit is for reducing the speed that discharge switch pipe disconnects or opens;
Described over-current detection circuit also includes timing module; when described over-current detection circuit detects the voltage threshold that the voltage of the first link of discharge switch pipe is higher than over-current detection; expression detected banishes electricity; described timing module starts timing; if the stream discharge period that crosses of timing module record exceedes the scheduled time, the outfan output overcurrent protection signal of described over-current detection circuit.
9. the improved battery protection circuit according to right 6, it is characterised in that it also includes charge management circuit, charge switch pipe and substrate selection circuit,
One end of described charge switch pipe is connected with described battery core, and its other end is connected with charge power supply, and it controls end and is connected with the outfan of described charge management circuit;
The first input end of described charge management circuit is connected with battery core, its second input is connected with charge power supply, described charge management circuit is for when the voltage of described charge power supply being detected more than the voltage of described battery core, controlling the conducting of described charge switch pipe and described battery core is charged;
Described substrate selection circuit is connected to the substrate of described charge switch pipe the underlayer voltage of the duty practical described charge switch pipe automatically according to described charge switch pipe.
10. a battery protection system, it is characterised in that described system include secondary battery core and as arbitrary in claim 1-9 as described in improved battery protection circuit.
11. battery protection system according to claim 10, it is characterised in that
It is connected to discharge module between the first power end and second source end,
Described discharge module includes the audio power amplifier circuit of Baffle Box of Bluetooth.
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| CN201610215078.4A CN105680422B (en) | 2016-04-07 | 2016-04-07 | Improved battery protects circuit and system |
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| CN201610215078.4A CN105680422B (en) | 2016-04-07 | 2016-04-07 | Improved battery protects circuit and system |
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