CN203747455U - Overvoltage and overcurrent protection circuit and mobile terminal - Google Patents
Overvoltage and overcurrent protection circuit and mobile terminal Download PDFInfo
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- CN203747455U CN203747455U CN201420056749.3U CN201420056749U CN203747455U CN 203747455 U CN203747455 U CN 203747455U CN 201420056749 U CN201420056749 U CN 201420056749U CN 203747455 U CN203747455 U CN 203747455U
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Abstract
The utility model relates to an overvoltage and overcurrent protection circuit and a mobile terminal. The overvoltage and overcurrent protection circuit comprises a first class protection circuit and a second class protection circuit. The first class protection circuit comprises a power supply end, a detection end and a low potential interface end. The power supply end and the detection end are respectively correspondingly connected with positive and negative poles of an electric core. The low potential interface end is connected with the ground end of a charge and discharge interface. The second class protection circuit comprises a high potential electric core end, a low potential electric core end and a high potential interface end. The high potential electric core end is respectively correspondingly connected with positive and negative poles of the electric core. The high potential interface end is connected with the power supply end of the external charge and discharge interface. If overcurrent or overvoltage appears, the first class protection circuit controls a MOS tube to switch off a charge and discharge circuit, and a fuse provided by the second class protection circuit can further protect the charge and discharge circuit. Even if the MOS tube is damaged, the fuse provided by the second class protection circuit can still protect the electric core and the charge and discharge circuit.
Description
Technical field
The utility model belongs to field of power supplies, relates in particular to over-voltage over-current protection circuit and mobile terminal.
Background technology
Along with the progress in epoch, the Internet and mobile radio communication provide the function application of magnanimity.User not only can use mobile terminal to carry out tradition application, for example: use smart mobile phone to answer or call; Meanwhile, user not only can use mobile terminal to carry out web page browsing, picture transmission, game etc.
The frequency of utilization that is accompanied by mobile terminal increases, and mobile terminal needs often charging, causes security incident for fear of charging abnormal, now provides a large amount of first class of protection circuit to realize and has prevented from overcharging and over-discharge can; But in the time overcharging with over-discharge can, existing first class of protection circuit (comprise and overcharging and over-discharge can protective circuit) is to disconnect charge circuit or discharge loop by metal-oxide-semiconductor.Once this metal-oxide-semiconductor is breakdown or damage; cause the protective effect overcharging with over-discharge can that prevents of first class of protection circuit to be lost efficacy; and then may cause the electronic devices and components of first class of protection circuit to damage, and cause other circuit of mobile terminal inside to damage, even cause fire.
Utility model content
The purpose of this utility model is to provide a kind of over-voltage over-current protection circuit and mobile terminal that adopts fuse to carry out second class protection; adopt metal-oxide-semiconductor to control conducting or shutoff to solve the first class of protection circuit of prior art, will cause the problem of super-charge super-discharge disabler once metal-oxide-semiconductor damages.
On the one hand, the utility model provides a kind of over-voltage over-current protection circuit, comprising:
First class of protection circuit, it comprises power end, test side and electronegative potential interface end; Wherein, power end is connected with the positive pole of battery core, and test side is connected with the negative pole of battery core, and electronegative potential interface end is connected with the ground end that discharges and recharges interface; Whether described first class of protection circuit is used for: in the time that battery core is charged, detect and overcharge, while overcharging, disconnect by described and discharge and recharge the charging of interface to described battery core; Described first class of protection circuit also for: detect whether to cross when the electric discharge of described battery core and put, cross while putting and disconnect described battery core by the described interface discharge that discharges and recharges;
Also comprise: safe secondary protection circuit, it comprises high potential battery core end, electronegative potential battery core end and high potential interface end; Wherein, the positive pole of the external described battery core of high potential battery core end, the negative pole of the external described battery core of electronegative potential battery core end, discharges and recharges the power end of interface described in high potential interface end is external; Described safe secondary protection circuit is used for: when discharging and recharging interface battery core being charged, carrying out overvoltage protection and overcurrent protection by fuse by described.
Further, described over-voltage over-current protection circuit also comprises:
Filter circuit, it comprises hot end and cold end; Wherein, hot end connects the electronegative potential interface end of described first class of protection circuit, and cold end connects the high potential interface end of described safe secondary protection circuit; Described filter circuit is used for: by described while discharging and recharging interface to the charging of described battery core, to carrying out low-pass filtering from the described signal of telecommunication that discharges and recharges interface access.
Further, described safe secondary protection circuit comprises:
The first resistance, the first electric capacity, the second resistance, the second electric capacity, the 3rd resistance, the 3rd electric capacity, voltage checking chip, pressure-limit current-limit fuse chip and switching circuit;
The first end of described the first resistance, the second fuse pin of the second end of described the 3rd resistance and described pressure-limit current-limit fuse chip is respectively the high potential battery core end of described safe secondary protection circuit, electronegative potential battery core end and high potential interface end, the positive voltage of described voltage checking chip detects pin, negative voltage pin, control output pin, power pins and delay pin connect respectively the second end of described the first resistance, the first end of described the first electric capacity, the second end of described the 3rd resistance, the controlled end of described switching circuit, the first end of the first end of described the 3rd electric capacity and described the second electric capacity, the second end of described the first electric capacity, the second end of described the 3rd electric capacity and the second end of described the second electric capacity all connect the second end of described the 3rd resistance, the first end of described the second resistance and the second end connect respectively the first fuse pin of described pressure-limit current-limit fuse chip and the first end of described the 3rd electric capacity, the control end of switching circuit described in the first termination of described the 3rd resistance, the hot end of described switching circuit and cold end connect respectively the pressure limiting pin of described pressure-limit current-limit fuse chip and the second end of described the 3rd resistance.
Further, described switching circuit comprises NMOS pipe;
Drain electrode, grid and the source electrode of described NMOS pipe is respectively described switching circuit hot end, controlled end and cold end
Further, described first class of protection circuit comprises:
The 4th resistance, the 5th resistance, the 6th resistance, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, super-charge super-discharge detection chip, the 3rd switch chip and the 4th switch chip;
The second end of the first end of described the 4th resistance, the first end of described the 5th resistance and described the 6th resistance is respectively power end, test side and the electronegative potential interface end of described safe secondary protection circuit, the current detecting pin of described super-charge super-discharge detection chip, power pins, ground pin, electronegative potential pin, overcharge pin and excessively put pin the second end that connects respectively described the 4th resistance, the first end of described the 4th electric capacity, the first end of described the 5th resistance, the first end of described the 6th resistance, the second grid pin of the first grid pin of described the 3rd switch chip and described the 3rd switch chip, the first end of the 5th resistance described in the second termination of described the 4th electric capacity, the second end of the first source lead of described the 3rd switch chip and the second source lead difference ground connection and described the 5th resistance, the 3rd gate lead of described the 4th switch chip, the 4th gate lead, the 3rd source lead and the 4th source lead respectively with the first grid pin of described the 3rd switch chip, second grid pin, the first source lead and the second source lead, described the 5th electric capacity after series connection and described the 6th electric capacity are connected between first source lead and the second source lead of described the 3rd switch chip, the second end ground connection of described the 6th resistance.
Further, described filter circuit comprises: the 7th electric capacity and the 8th electric capacity;
The second end of the first end of described the 7th electric capacity and described the 8th electric capacity is respectively hot end and the cold end of described filter circuit, the first end of the 8th electric capacity described in the second termination of described the 7th electric capacity.
Further, described in, discharging and recharging interface is general-purpose serial bus USB interface.
Further, the power end of described USB interface and ground end can bear predetermined current threshold value and following electric current.
Further, the power end of described USB interface is at least two power pins; The ground end of described USB interface is at least two ground pins.
On the one hand, the utility model provides a kind of mobile terminal, comprises battery core and discharges and recharges interface, also comprises above-mentioned over-voltage over-current protection circuit.
The beneficial effects of the utility model: if overcurrent or overvoltage; when disconnecting charge circuit or discharge loop by first class of protection circuit control metal-oxide-semiconductor, the fuse also providing by safe secondary protection circuit is further protected battery core and charge-discharge circuit in the time of overvoltage or overcurrent.And then even if the metal-oxide-semiconductor that first class of protection circuit provides damages and causes losing overcurrent or over-voltage protecting function, the fuse that still can provide by safe secondary protection circuit is protected battery core and charge-discharge circuit.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit structure diagram of the over-voltage over-current protection circuit that provides of the utility model embodiment;
Fig. 2 is the circuit diagram of the over-voltage over-current protection circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
For technical scheme described in the utility model is described, describe below by specific embodiment.
In the utility model embodiment, mobile terminal comprises battery core and discharges and recharges interface, also comprises over-voltage over-current protection circuit; In the time that needs charge to battery core, from discharging and recharging the interface access signal of telecommunication and charging through over-voltage over-current protection circuit; In addition, in the time that battery core is powered to mobile terminal by the high potential interface end of safe secondary protection circuit 1 and the electronegative potential interface end of first class of protection circuit 2, carry out Cross prevention by first class of protection circuit 2.Thereby no matter for battery core charging, or for battery core electric discharge, all can realize over-voltage over-current protection.
Fig. 1 shows the composition structure of the over-voltage over-current protection circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows.
A kind of over-voltage over-current protection circuit, comprising:
First class of protection circuit 2, it comprises power end, test side and electronegative potential interface end; Wherein, power end is connected with the positive pole of battery core, and test side is connected with the negative pole of battery core, and electronegative potential interface end is connected with the ground end that discharges and recharges interface; Described first class of protection circuit 2 for: in the time that battery core is charged, detect and whether overcharge, while overcharging, disconnect by described and discharge and recharge the charging of interface to described battery core; Described first class of protection circuit 2 also for: detect whether to cross when the electric discharge of described battery core and put, cross while putting and disconnect described battery core by the described interface discharge that discharges and recharges;
Also comprise:
Safe secondary protection circuit 1, it comprises high potential battery core end, electronegative potential battery core end and high potential interface end; Wherein, the positive pole of the external described battery core of high potential battery core end, the negative pole of the external described battery core of electronegative potential battery core end, discharges and recharges the power end of interface described in high potential interface end is external; Described safe secondary protection circuit 1 for: when discharging and recharging interface battery core being charged, carrying out overvoltage protection and overcurrent protection by fuse by described.
Wherein, the positive pole of described battery core and negative pole adopt respectively Node B+and Node B-expression.
Wherein, the high potential interface end of described safe secondary protection circuit 1 adopts node C+ to represent; Meanwhile, the electronegative potential interface end of first class of protection circuit 2 adopts node C-to represent.Wherein, can be mobile terminal power supply by node C+ and node C-.
Specifically, in the time that battery core is charged, first class of protection circuit 2 can detect the charging voltage to battery core charging in real time by power end and ground end; Once charging voltage is excessive, first class of protection circuit 2 can disconnect and discharge and recharge the charge circuit of interface to battery core charging; In addition, once battery core is full of, for fear of battery core is overcharged, first class of protection circuit 2 can disconnect and discharge and recharge the charge circuit of interface to battery core charging, thereby stops battery core charging.In addition, first class of protection circuit 2 also detects charging current in real time, if charging current is excessive, disconnects and discharges and recharges the charge circuit of interface to battery core charging.Because first class of protection circuit 2 is to adopt the conducting of metal-oxide-semiconductor control charge circuit or disconnection, for example, while damaging (: breakdown) for fear of metal-oxide-semiconductor, cannot disconnect charge circuit, the utility model embodiment has added safe secondary protection circuit 1; When first class of protection circuit 2 detects the voltage of positive and negative end of battery core in real time, this safe secondary protection circuit 1 also detects in real time the voltage (i.e. the charging voltage to battery core charging) of the positive and negative end of battery core and detects in real time the charging current to battery core charging; Once battery core charging voltage is excessive, battery core is full of or charging current is excessive, this safe secondary protection circuit 1 will, by disconnecting the mode of fuse, disconnect charge circuit.
Under normal circumstances, in the time that battery core is powered (being battery core electric discharge) by the high potential interface end of safe secondary protection circuit 1 and the electronegative potential interface end of first class of protection circuit 2 to mobile terminal, safe secondary protection circuit 1 and first class of protection circuit 2 all can not detect that the voltage of positive and negative end of battery core is excessive, but safe secondary protection circuit 1 and first class of protection circuit 2 still all provide overvoltage protection; When battery core electric discharge, the operation principle when operation principle of protection is carried out overvoltage protection with first class of protection circuit 2 when safe secondary protection circuit 1 carries out overvoltage is the same, does not repeat them here.In addition; cross and put for fear of battery core; safe secondary protection circuit 1 detects battery core in real time discharging current by fuse is carrying out overcurrent protection when; first class of protection circuit 2 also detects the discharging current of battery core in real time by resistance; while putting to cross in battery core; safe secondary protection circuit 1 disconnects the discharge loop of battery core by fuse, and/or first class of protection circuit 2 is controlled metal-oxide-semiconductor disconnection discharge loop.
What deserves to be explained is, can be according to actual user demand, the fuse in selected safe secondary protection circuit 1, thus determine the maximum current that fuse can bear; When another also selected first class of protection circuit 2 is much at the electric current of charge or discharge, and the both positive and negative polarity voltage of battery core is while being much, disconnects charge circuit or discharge loop.And then determine: once charge circuit overcurrent or discharge loop overcurrent, along with the increase gradually of electric current, are first to disconnect charging and discharging circuit by first class of protection circuit 2, or first disconnect charging and discharging circuit by safe secondary protection circuit 1; Determine, first start over-voltage over-current protection by first class of protection circuit 2, or first start over-voltage over-current protection by safe secondary protection circuit 1.
In another embodiment of the utility model, described over-voltage over-current protection circuit also comprises:
Filter circuit 3, it comprises hot end and cold end; Wherein, hot end connects the electronegative potential interface end of described first class of protection circuit 2, and cold end connects the high potential interface end of described safe secondary protection circuit 1; Described filter circuit 3 for: by described while discharging and recharging interface to the charging of described battery core, to carrying out low-pass filtering from the described signal of telecommunication that discharges and recharges interface access.
In addition, for fear of in the time charging, by discharging and recharging the HF noise signal of interface access, (this HF noise signal comprises: the current signal that can trigger overcurrent protection, or can trigger the voltage signal of overvoltage protection) false triggering first class of protection circuit 2 and/or safe secondary protection circuit 1 disconnect charge circuit, and therefore introduce filter circuit 3 power supply signal that discharges and recharges interface access is carried out to low-pass filtering; Then just the power supply signal after low-pass filtering is charged to battery core.
Fig. 2 shows the physical circuit of the over-voltage over-current protection circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows.
In the utility model one embodiment, described safe secondary protection circuit 1 comprises:
The first resistance R 1, the first capacitor C 1, the second resistance R 2, the second capacitor C 2, the 3rd resistance R 3, the 3rd capacitor C 3, voltage checking chip U1, pressure-limit current-limit fuse chip U2 and switching circuit 11;
The first end of described the first resistance R 1, the second fuse pin F2 of the second end of described the 3rd resistance R 3 and described pressure-limit current-limit fuse chip U2 is respectively the high potential battery core end of described safe secondary protection circuit 1, electronegative potential battery core end and high potential interface end, the positive voltage of described voltage checking chip U1 detects pin SENSE, negative voltage pin VSS, control output pin CO, power pins VCC and delay pin LCT connect respectively the second end of described the first resistance R 1, the first end of described the first capacitor C 1, the second end of described the 3rd resistance R 3, the controlled end of described switching circuit 11, the first end of the first end of described the 3rd capacitor C 3 and described the second capacitor C 2, the second end of described the first capacitor C 1, the second end of the second end of described the 3rd capacitor C 3 and described the second capacitor C 2 all connects the second end of described the 3rd resistance R 3, the first end of described the second resistance R 2 and the second end connect respectively the first fuse pin F1 of described pressure-limit current-limit fuse chip U2 and the first end of described the 3rd capacitor C 3, the control end of switching circuit 11 described in the first termination of described the 3rd resistance R 3, the hot end of described switching circuit 11 and cold end connect respectively the pressure limiting pin HEATER of described pressure-limit current-limit fuse chip U2 and the second end of described the 3rd resistance R 3.
It should be noted that, pressure-limit current-limit fuse chip U2 inside has two sections of fuses and a resistance; Wherein, between the first fuse pin F1 and the second fuse pin F2 being connected at pressure-limit current-limit fuse chip U2 after two sections of fuse series connection; Wherein, this inner resistance is connected between being connected in series a little of two sections of fuses and pressure limiting pin HEATER,, between the first fuse pin F1 and pressure limiting pin HEATER, be in series with one section of fuse and this resistance, between the second fuse pin F2 and pressure limiting pin HEATER, be in series with another section of fuse and this resistance.
Like this, in the process that battery core is charged, voltage checking chip U1 detects pin SENSE by positive voltage and negative voltage pin VSS detects the charging voltage to battery core charging in real time, once this charging voltage is excessive, from controlling output pin CO output control signal; By these control signal control switch circuit 11 conductings, if charging voltage is excessive, can on this section of fuse between the second fuse pin F2 and the pressure limiting pin HEATER of pressure-limit current-limit fuse chip U2, form current voltage with this section of fuse that fuse; After thereby one section of fuse in two sections of fuses disconnects, charge circuit disconnects, and stops battery core charging.
In addition, when when discharging and recharging interface battery core is charged, if charging current is excessive, two sections of fuses between the first fuse pin F1 of pressure-limit current-limit fuse chip U2 and the second fuse pin F2 all can fuse, and directly disconnect charge circuit.
Like this, when first class of protection circuit 2 lost efficacy, while losing over-voltage over-current protection function, can realize over-voltage over-current protection by the fuse of pressure-limit current-limit fuse chip U2 inside.
In addition, cross while putting in battery core, two sections of fuses between the first fuse pin F1 of pressure-limit current-limit fuse chip U2 and the second fuse pin F2 all can fuse, and directly disconnect discharge loop, stop powering to mobile terminal by discharging and recharging interface.
Under normal circumstances, when battery core electric discharge, can there is not overpressure problems, if existed, can realize overvoltage protection by this section of fuse between the first fuse pin F1 of pressure-limit current-limit fuse chip U2 and pressure limiting pin HEATER.Its operation principle and when charging the second fuse pin F2 by pressure-limit current-limit fuse chip U2 and pressure limiting pin HEATER to realize the same energy of overvoltage protection similar, do not repeat them here.Preferably, the model of described pressure-limit current-limit fuse chip U2 is SFJ-0412.
Separately preferably, according to the control needs of switching circuit 11, the control signal of the control output pin CO output of voltage checking chip U1 can be high potential signal or low-potential signal.And then described switching circuit 11 can be selected the circuit of NMOS pipe or PMOS pipe composition.For example: when this control signal is low-potential signal, select switching circuit 11 to select PMOS pipe to realize.
As the utility model one embodiment, described voltage checking chip U1 selects S8244_C, thereby in the time that charging voltage is excessive, the control output pin CO of voltage checking chip U1 can export high level signal.
Preferably, described switching circuit 11 comprises NMOS pipe; Drain electrode, grid and the source electrode of described NMOS pipe is respectively described switching circuit 11 hot ends, controlled end and cold end.
Thereby in the time overcharging or excessively put, if the control signal of the control output pin CO of voltage checking chip U1 output is high potential signal, the optional NMOS pipe of described switching circuit 11 is realized.Separately, according to real work needs, select the maximum current that NMOS pipe can bear to manage to choose NMOS.
In the utility model one embodiment, described first class of protection circuit 2 comprises:
The 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, super-charge super-discharge detection chip U3, the 3rd switch chip U4 and the 4th switch chip U5;
The second end of the first end of described the 4th resistance R 4, the first end of described the 5th resistance R 5 and described the 6th resistance R 6 is respectively power end, test side and the electronegative potential interface end of described safe secondary protection circuit 1, the current detecting pin CS of described super-charge super-discharge detection chip U3, power pins VDD, ground pin VSS, electronegative potential pin V, overcharge pin COUT and excessively put pin DOUT the second end that connects respectively described the 4th resistance R 4, the first end of described the 4th capacitor C 4, the first end of described the 5th resistance R 5, the first end of described the 6th resistance R 6, the second grid pin G2 of the first grid pin G1 of described the 3rd switch chip U4 and described the 3rd switch chip U4, the first end of the 5th resistance R 5 described in the second termination of described the 4th capacitor C 4, the second end of the first source lead S1 of described the 3rd switch chip U4 and the second source lead S2 difference ground connection and described the 5th resistance R 5, the 3rd gate lead G3 of described the 4th switch chip U5, the 4th gate lead G4, the 3rd source lead S3 and the 4th source lead S4 respectively with the first grid pin G1 of described the 3rd switch chip U4, second grid pin G2, the first source lead S1 and the second source lead S2, described the 5th capacitor C 5 after series connection and described the 6th capacitor C 6 are connected between the first source lead S1 and the second source lead S2 of described the 3rd switch chip U4, the second end ground connection of described the 6th resistance R 6.
Like this, if charging current when battery core charging is excessive, super-charge super-discharge detection chip U3 detects large negative voltage by current detecting pin CS and ground pin VSS, thereby, super-charge super-discharge detection chip U3 is from overcharging pin COUT output control signal, by control signal control the 3rd switch chip U4 from overcharging pin COUT output and the disconnection charge circuit of the 4th switch chip U5.In addition, in the time that battery core is charged, super-charge super-discharge detection chip U3 detects when excessive to the charging voltage of battery core by power pins VDD and ground pin VSS, also from overcharging control signal control the 3rd switch chip U4 of pin COUT output and the disconnection charge circuit of the 4th switch chip U5.
If discharging current when battery core electric discharge is excessive, super-charge super-discharge detection chip U3 detects large positive voltage by current detecting pin CS and ground pin VSS, thereby, super-charge super-discharge detection chip U3 is put pin DOUT output control signal from crossing, by putting control signal control the 3rd switch chip U4 of pin DOUT output and the disconnection discharge loop of the 4th switch chip U5 from crossing.In addition, under normal circumstances, battery core electric discharge can not stored overpressure problems, if but overvoltage, super-charge super-discharge detection chip U3 detects when excessive to the charging voltage of battery core by power pins VDD and ground pin VSS, also from overcharging control signal control the 3rd switch chip U4 of pin COUT output and the disconnection charge circuit of the 4th switch chip U5.
In the utility model one embodiment, described filter circuit 3 comprises: the 7th capacitor C 7 and the 8th capacitor C 7;
The second end of the first end of described the 7th capacitor C 7 and described the 8th capacitor C 8 is respectively hot end and the cold end of described filter circuit 3, the first end of the 8th capacitor C 8 described in the second termination of described the 7th capacitor C 7.
Like this; when discharging and recharging interface battery core charged; the filter circuit 3 filter away high frequency noise signals that can be in advance form through the 7th capacitor C 7 and the 8th capacitor C 7; and then; while avoiding battery core to charge; HF noise signal false triggering first class of protection circuit 2 disconnects charge circuit by metal-oxide-semiconductor, and/or false triggering safe secondary protection circuit 1 carries out overvoltage or overcurrent protection by the fuse in pressure-limit current-limit fuse chip U2.
In the utility model one embodiment, described in to discharge and recharge interface be USB (Universal Serial Bus, USB) interface.Particularly, USB interface can be existing (for example: the conventional USB interface of 5 volts); In addition, USB interface can not adopt existing, according to charging current needs, adopts the charging current that increase can be born in two ways, and the first, selects the stitch that can bear large electric current, can bear charging current; The second, existing USB interface equal intervals (this spacing is the spacing between stitch in existing USB interface) increase power pins and the ground pin of equal number, and then the USB interface increasing after stitch can be used different large charging currents.Certainly, the first and the second increase the mode that can bear maximum charging current and can use simultaneously.
In the utility model one preferred embodiment, the power end of described USB interface and ground end can bear predetermined current threshold value and following electric current.
Preferably, described predetermined current threshold value is 4 amperes.
Preferably, the power end of described USB interface is at least two power pins; The ground end of described USB interface is at least two ground pins.Wherein, transmit power supply signal by power pins, by ground pin transmission earth signal.
Particularly, for can with existing usb compatible, while needing to increase the charging current that can bear, existing USB interface equal intervals increase one or more power pins and one or more ground pin; The quantity of the power pins wherein, increasing is identical with the quantity of ground pin.In addition, the spacing increasing between each stitch that the USB interface after pin comprises is: the spacing in existing USB interface between stitch.Only can work as only need to carry out common charging to battery core time, can adopt existing USB interface, realize the compatibility to existing USB interface.
The utility model embodiment also provides a kind of mobile terminal, comprises battery core and discharges and recharges interface, and also comprise above-mentioned over-voltage over-current protection circuit, described over-voltage over-current protection circuit comprises first class of protection circuit 2 and safe secondary protection circuit 1;
The power end of described first class of protection circuit 2 and test side connect respectively positive pole and the negative pole of battery core, the external ground end that discharges and recharges interface of electronegative potential interface end of described first class of protection circuit 2;
Positive pole and the negative pole of battery core described in the high potential battery core end of described safe secondary protection circuit 1 and electronegative potential battery core termination, discharge and recharge the power end of interface described in the high potential interface end of described safe secondary protection circuit 1 is external.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field; make without departing from the concept of the premise utility some alternative or obvious modification that are equal to; and performance or purposes identical, all should be considered as belonging to the utility model by the definite scope of patent protection of submitted to claims.
Claims (10)
1. an over-voltage over-current protection circuit, comprising:
First class of protection circuit, it comprises power end, test side and electronegative potential interface end; Wherein, power end is connected with the positive pole of battery core, and test side is connected with the negative pole of battery core, and electronegative potential interface end is connected with the ground end that discharges and recharges interface; Whether described first class of protection circuit is used for: in the time that battery core is charged, detect and overcharge, while overcharging, disconnect by described and discharge and recharge the charging of interface to described battery core; Described first class of protection circuit also for: detect whether to cross when the electric discharge of described battery core and put, cross while putting and disconnect described battery core by the described interface discharge that discharges and recharges;
It is characterized in that, also comprise:
Safe secondary protection circuit, it comprises high potential battery core end, electronegative potential battery core end and high potential interface end; Wherein, the positive pole of the external described battery core of high potential battery core end, the negative pole of the external described battery core of electronegative potential battery core end, discharges and recharges the power end of interface described in high potential interface end is external; Described safe secondary protection circuit is used for: when discharging and recharging interface battery core being charged, carrying out overvoltage protection and overcurrent protection by fuse by described.
2. over-voltage over-current protection circuit as claimed in claim 1, is characterized in that, described over-voltage over-current protection circuit also comprises:
Filter circuit, it comprises hot end and cold end; Wherein, hot end connects the electronegative potential interface end of described first class of protection circuit, and cold end connects the high potential interface end of described safe secondary protection circuit; Described filter circuit is used for: by described while discharging and recharging interface to the charging of described battery core, to carrying out low-pass filtering from the described signal of telecommunication that discharges and recharges interface access.
3. over-voltage over-current protection circuit as claimed in claim 1, is characterized in that, described safe secondary protection circuit comprises:
The first resistance, the first electric capacity, the second resistance, the second electric capacity, the 3rd resistance, the 3rd electric capacity, voltage checking chip, pressure-limit current-limit fuse chip and switching circuit;
The first end of described the first resistance, the second fuse pin of the second end of described the 3rd resistance and described pressure-limit current-limit fuse chip is respectively the high potential battery core end of described safe secondary protection circuit, electronegative potential battery core end and high potential interface end, the positive voltage of described voltage checking chip detects pin, negative voltage pin, control output pin, power pins and delay pin connect respectively the second end of described the first resistance, the first end of described the first electric capacity, the second end of described the 3rd resistance, the controlled end of described switching circuit, the first end of the first end of described the 3rd electric capacity and described the second electric capacity, the second end of described the first electric capacity, the second end of described the 3rd electric capacity and the second end of described the second electric capacity all connect the second end of described the 3rd resistance, the first end of described the second resistance and the second end connect respectively the first fuse pin of described pressure-limit current-limit fuse chip and the first end of described the 3rd electric capacity, the control end of switching circuit described in the first termination of described the 3rd resistance, the hot end of described switching circuit and cold end connect respectively the pressure limiting pin of described pressure-limit current-limit fuse chip and the second end of described the 3rd resistance.
4. over-voltage over-current protection circuit as claimed in claim 3, is characterized in that, described switching circuit comprises NMOS pipe;
Drain electrode, grid and the source electrode of described NMOS pipe is respectively described switching circuit hot end, controlled end and cold end.
5. over-voltage over-current protection circuit as claimed in claim 1, is characterized in that, described first class of protection circuit comprises:
The 4th resistance, the 5th resistance, the 6th resistance, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, super-charge super-discharge detection chip, the 3rd switch chip and the 4th switch chip;
The second end of the first end of described the 4th resistance, the first end of described the 5th resistance and described the 6th resistance is respectively power end, test side and the electronegative potential interface end of described safe secondary protection circuit, the current detecting pin of described super-charge super-discharge detection chip, power pins, ground pin, electronegative potential pin, overcharge pin and excessively put pin the second end that connects respectively described the 4th resistance, the first end of described the 4th electric capacity, the first end of described the 5th resistance, the first end of described the 6th resistance, the second grid pin of the first grid pin of described the 3rd switch chip and described the 3rd switch chip, the first end of the 5th resistance described in the second termination of described the 4th electric capacity, the second end of the first source lead of described the 3rd switch chip and the second source lead difference ground connection and described the 5th resistance, the 3rd gate lead of described the 4th switch chip, the 4th gate lead, the 3rd source lead and the 4th source lead respectively with the first grid pin of described the 3rd switch chip, second grid pin, the first source lead and the second source lead, described the 5th electric capacity after series connection and described the 6th electric capacity are connected between first source lead and the second source lead of described the 3rd switch chip, the second end ground connection of described the 6th resistance.
6. over-voltage over-current protection circuit as claimed in claim 2, is characterized in that, described filter circuit comprises: the 7th electric capacity and the 8th electric capacity;
The second end of the first end of described the 7th electric capacity and described the 8th electric capacity is respectively hot end and the cold end of described filter circuit, the first end of the 8th electric capacity described in the second termination of described the 7th electric capacity.
7. over-voltage over-current protection circuit as claimed in claim 1, is characterized in that, described in to discharge and recharge interface be general-purpose serial bus USB interface.
8. over-voltage over-current protection circuit as claimed in claim 7, is characterized in that, the power end of described USB interface and ground end can bear predetermined current threshold value and following electric current.
9. over-voltage over-current protection circuit as claimed in claim 8, is characterized in that, the power end of described USB interface is at least two power pins;
The ground end of described USB interface is at least two ground pins.
10. a mobile terminal, comprises battery core and discharges and recharges interface, it is characterized in that, also comprises the arbitrary described over-voltage over-current protection circuit of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420056749.3U CN203747455U (en) | 2014-01-28 | 2014-01-28 | Overvoltage and overcurrent protection circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420056749.3U CN203747455U (en) | 2014-01-28 | 2014-01-28 | Overvoltage and overcurrent protection circuit and mobile terminal |
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| Publication Number | Publication Date |
|---|---|
| CN203747455U true CN203747455U (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420056749.3U Expired - Lifetime CN203747455U (en) | 2014-01-28 | 2014-01-28 | Overvoltage and overcurrent protection circuit and mobile terminal |
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| CN (1) | CN203747455U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466917A (en) * | 2014-11-14 | 2015-03-25 | 浙江超威创元实业有限公司 | Electric vehicle lithium battery management system |
| CN104548354A (en) * | 2015-01-14 | 2015-04-29 | 深圳市科曼医疗设备有限公司 | Defibrillation charging overcurrent protection device of defibrillator monitor and defibrillator monitor |
| CN104810878A (en) * | 2014-01-28 | 2015-07-29 | 广东欧珀移动通信有限公司 | Overvoltage/overcurrent protection circuit and mobile terminal |
| WO2018036334A1 (en) * | 2016-08-22 | 2018-03-01 | 深圳拓邦股份有限公司 | Battery charging protection latch circuit and double-protection circuit |
| CN113659645A (en) * | 2021-06-21 | 2021-11-16 | 东莞市吉瑞达实业有限公司 | High-voltage charging and discharging secondary protection circuit |
-
2014
- 2014-01-28 CN CN201420056749.3U patent/CN203747455U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810878A (en) * | 2014-01-28 | 2015-07-29 | 广东欧珀移动通信有限公司 | Overvoltage/overcurrent protection circuit and mobile terminal |
| WO2015113353A1 (en) * | 2014-01-28 | 2015-08-06 | 广东欧珀移动通信有限公司 | Overvoltage and overcurrent protection circuit and mobile terminal |
| US10312702B2 (en) | 2014-01-28 | 2019-06-04 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Overvoltage and overcurrent protection circuit and mobile terminal |
| US10333321B2 (en) | 2014-01-28 | 2019-06-25 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Overvoltage and overcurrent protection circuit and mobile terminal |
| CN104466917A (en) * | 2014-11-14 | 2015-03-25 | 浙江超威创元实业有限公司 | Electric vehicle lithium battery management system |
| CN104548354A (en) * | 2015-01-14 | 2015-04-29 | 深圳市科曼医疗设备有限公司 | Defibrillation charging overcurrent protection device of defibrillator monitor and defibrillator monitor |
| WO2018036334A1 (en) * | 2016-08-22 | 2018-03-01 | 深圳拓邦股份有限公司 | Battery charging protection latch circuit and double-protection circuit |
| CN113659645A (en) * | 2021-06-21 | 2021-11-16 | 东莞市吉瑞达实业有限公司 | High-voltage charging and discharging secondary protection circuit |
| CN113659645B (en) * | 2021-06-21 | 2024-05-07 | 东莞市吉瑞达实业有限公司 | High-voltage charge-discharge secondary protection circuit |
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| C14 | Grant of patent or utility model | ||
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| CP03 | Change of name, title or address |
Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. Address before: Changan town in Guangdong province Dongguan 523841 usha Beach Road No. 18 Patentee before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. |
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Granted publication date: 20140730 |