CN100536273C - Terminal equipment charging overvoltage protective device and method - Google Patents
Terminal equipment charging overvoltage protective device and method Download PDFInfo
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- CN100536273C CN100536273C CNB2007100769803A CN200710076980A CN100536273C CN 100536273 C CN100536273 C CN 100536273C CN B2007100769803 A CNB2007100769803 A CN B2007100769803A CN 200710076980 A CN200710076980 A CN 200710076980A CN 100536273 C CN100536273 C CN 100536273C
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Abstract
The present invention discloses an overcharge protection device and method for a terminal equipment, which comprises: a switch circuit 1 that is concatenated between the input end of the charging voltage and the input end of the battery management chip for detecting the plug in and out status of the charger; a switch circuit 2 that is concatenated between the control end of the charging switch circuit and the output end of the charging control of the battery management chip; a charging input voltage detecting circuit for detecting the voltage volume of the input end of the charging voltage, and sending the status signal to the time delay control circuit; and a time delay control circuit for generating control signal according to the detected result of the input charging voltage detecting circuit, and sending the control signal to the control end of the switch circuits 1,2. The present invention can not only prevent the terminal from being damaged while an overcharge occurs, but also has a self recovery function at low circuit costs, at the same time without influencing the maintenance and function realization of the system.
Description
Technical field
The present invention relates to over-voltage protection method, be specifically related to a kind of devices and methods therefor of terminal equipment charging overvoltage protective.
Background technology
China's Ministry of Information Industry (MII) has issued " mobile phone charger and interfacing require and method of testing " in November, 2006, and (YD/T1591-2006), regulation hand-held set inside must have the charging overvoltage protection function.Industry is present, the way of using always in the charging overvoltage protection scheme:
A, realize charging overvoltage, overcurrent protection function with fuse.This method circuit is fairly simple, but has the shortcoming of irrecoverable property.Prescribe a time limit when the charger output voltage is higher than protective valve, blowout plays a protective role; prevent that overvoltage from damaging terminal equipment, but after the blowout, can't repair voluntarily; so after this terminal can't charge again, have only the fuse of more finishing changing after, could charge normal battery.What be that the Chinese patent " charge protector " of CN1972066 just adopts as publication number is this class scheme.
B, at the charger overvoltage crowbar of connecting with the terminal charge input.This scheme can realize charging overvoltage protection, and can recover voluntarily, and promptly charging voltage is prescribed a time limit less than protective valve, and terminal can normally be charged again; But this scheme cost is too high.Because protective circuit is serially connected between charger and the terminal charge input, so it need bear the two-way electric current, one the tunnel is that power management chip PM (Power Management) detects the electric current that charger plugs and unplugs status detection input VCHG absorption, this electric current is very little, is generally less than 1mA; Another Lu Weijing electric current and terminal self operating current sum that triode Q charges the battery of overcharging, this value is very big, is generally 500mA-800mA.Therefore, whether protective circuit must comprise a more powerful device (as metal-oxide-semiconductor) control charger and be communicated with the terminal charge input, and it is higher so just to have improved cost.
In sum, above-mentioned two kinds of schemes all do not solve the problem of the overvoltage protection of terminal equipment under charge condition well.
Summary of the invention
The invention provides a kind of terminal equipment charging overvoltage protective device and method thereof, it can be when overvoltage be charged, and the protection terminal is not damaged, and have restore funcitons voluntarily again, and circuit cost is very low, and the maintainability and the function that do not influence system simultaneously again realize.
Terminal equipment charging overvoltage protective device of the present invention, it is used for the terminal equipment charging system, this system comprise the battery management chip that management whole terminal power supply is supplied with and be serially connected in the charging voltage input and the cell voltage input between charge switch circuit; Described device comprises: the detection charger that first switching circuit, this switching circuit are serially connected in charging voltage input and battery management chip plugs and unplugs between the state-detection input; The detection charger of described battery management chip plugs and unplugs the state-detection input by detecting input voltage, judges that charger inserts or extracts; Second switch circuit, this switching circuit are serially connected between the charging control output end of the control end of charge switch circuit and battery management chip; The charging control output end of described battery management chip is used for controlling described charge switch circuit conducting when having detected the charger insertion; The charging input voltage detection circuit is used to detect the voltage swing of charging voltage input, and sends detected status signal to delay control circuit; And delay control circuit, be used for producing control signal according to the testing result of described charging input voltage detection circuit, and this control signal is sent to the control end of first switching circuit and second switch circuit: the voltage of the charging voltage input that is detected when described charging input voltage detection circuit is during more than or equal to overvoltage protection valve limit value, and described delay control circuit turn-offs first switching circuit and second switch circuit; The voltage of the charging voltage input that is detected when described charging input voltage detection circuit is during less than overvoltage protection valve limit value, and described delay control circuit makes first switching circuit and second switch closing of circuit.
Wherein, described charging input voltage detection circuit comprises: the voltage sample unit is used for obtaining sampling voltage from the charging voltage input; And detect comparing unit, be used for described sampling voltage is compared with voltage protection valve limit value, and the output testing result is given described delay control circuit.
Wherein, described voltage sample unit adopts the resistance sampling circuit of being made up of two series resistances, and this resistance sampling circuit is connected across between the positive pole and negative pole of charging voltage input, and one of them ohmically dividing potential drop is sampling voltage.
Wherein, described detection comparing unit comprises first triode, described sampling voltage provides bias voltage for the base stage of described first triode, the described first triode conducting, and obtaining the overvoltage condition amount of charging voltage input from the collector electrode of this triode, the emitter of described first triode connects the negative pole of charging voltage input.
Wherein, described delay control circuit also comprises a delay circuit, is used to prolong the time that described control signal produces.
Wherein, described delay control circuit comprises the pull-up resistor and second triode, and the base stage of described second triode is by the positive pole of pull-up resistor connection charging voltage input, and the emitter of described second triode connects the negative pole of charging voltage input; The overvoltage condition amount of described charging input voltage detection circuit output is used to clamp down on the bias voltage of described second transistor base, make this triode by and produce the control signal that first switching circuit and second switch circuit are turn-offed; Described delay circuit is a charging capacitor, the two ends of this charging capacitor are connected across between the base stage and emitter of described second triode, this charging capacitor obtains the electric weight charging by described pull-up resistor from the charging voltage input, and makes the described second triode conducting produce the control signal that makes first switching circuit and second switch closing of circuit.
Wherein, described first switching circuit and second switch circuit adopt all-controlling power electronics device, and it comprises gate level turn-off thyristor, electric power thyristor, power transistor, electric power field effect transistor and igbt.
Wherein, described charge switch circuit adopts the charging triode; Described second switch circuit is serially connected between the charging triode control output end of charging base stage of triode and battery management chip.
The method of terminal equipment charging overvoltage protective of the present invention, it adopts charger to give described terminal equipment charging, it is characterized in that described method is carried out according to the following steps:
A, affirmation charger insert;
B, detect the voltage status of charger input by the charging input voltage detection circuit;
Whether C, judgement detect the charging voltage of charger more than or equal to overvoltage protection valve limit value; If, execution in step D then; If not, execution in step E then;
D, send control signal, make the shutoff of first switching circuit and second switch circuit, and return step B by delay control circuit;
E, send control signal, make first switching circuit and second switch circuit delay closure by delay control circuit, thereby by battery management chip control battery charge, and return step B.
Wherein, in the described step e, described delay control circuit charges by the electric capacity that adopts the RC series circuit and realizes delay effect.
Main feature of the present invention is by the charger detection input VCHG that plugs and unplugs that only controls battery management chip PM no-voltage to be arranged, and realizes the terminal charge over-voltage protecting function.The terminal equipment charging circuit generally is made up of power management part (PM) and charging triode (or metal-oxide-semiconductor).Battery management chip PM module is responsible for the power supply of whole terminal system and is supplied with and management; The PM module mainly is made up of battery management, voltage management and three submodules of load management, and is open in its basic structure prior art.PM realizes battery charge by control charging triode.Therefore the node that links to each other with the external charge device has two kinds, a kind of E pin for the charging triode, and the another kind of charger that plugs and unplugs for battery management chip PM detects input VCHG.The EC knot withstand voltage higher (being generally more than the 20V) of charging triode do not need protection, and plugging and unplugging charger test side VCHG and charging control output end CHG_CTR withstand voltage lower (being generally several volts) of battery management chip PM needs protection.Do not need protection based on the charging triode; PM plugs and unplugs the charger test side principle that needs protection; device of the present invention is only implemented protection to VCHG and the CHG_CTR end of battery management chip PM; the electric current that its test side absorbs is very little again; and simple, the of no use power device of its realization circuit, so cost is very low.The present invention realizes that with simple and direct and the safest method protection terminal and charger are not damaged under the prerequisite that guarantees reliability.
Description of drawings
Fig. 1 is the structured flowchart schematic diagram of charging overvoltage protective device of the present invention;
Fig. 2 is the electrical block diagram of charging overvoltage protective device of the present invention;
Fig. 3 is the flow chart of control method of the present invention.
Embodiment
Below will describe each preferred embodiment of the present invention in detail.
Terminal equipment charging overvoltage protective device of the present invention, be used for the terminal equipment charging system, this system comprises that (PM can adopt the PM6650 of QualCom company to the battery management chip PM that manages the supply of whole terminal power supply, its effect with two pin VCHG and CHG_CTR:VCHG is, detect charger and insert or extract state, when VCHG pin voltage during greater than certain rated value, 3V for example, judge that charger inserts, and extracts charger otherwise be judged as; The effect of CHG_CTR is that when having detected the charger insertion, charging triode Q conducting in the control chart 1 is to finish charger to battery charge.) and be serially connected in charge switch circuit 105 between charging voltage input and the cell voltage input; As shown in Figure 1, be that terminal charge is an example to adopt charger, the structure of charging overvoltage protective device of the present invention is described.
As shown in Figure 1, charging overvoltage protective device of the present invention comprises: first switching circuit 103, second switch circuit 104, charging input voltage detection circuit 101 and delay control circuit 102;
The detection charger that first switching circuit 103 is serially connected in charging voltage input (being the charger input) and battery management chip PM plugs and unplugs between the state-detection input VCHG;
Charging input voltage detection circuit 101 is used to detect the voltage swing of charging voltage input (being the charger input), and sends detected status signal to delay control circuit 102;
Charging input voltage detection circuit 101 shown in Figure 1 can comprise: be used for obtaining the voltage sample unit of sampling voltage and detecting comparing unit from the charging voltage input; this detection comparing unit is used for described sampling voltage is compared with voltage protection valve limit value; and export testing result and give described delay control circuit, specific implementation can be referring to the physical circuit of Fig. 2.
As shown in Figure 2, described voltage sample unit adopts the resistance sampling circuit of being made up of two series resistances (R1, R2), this resistance sampling circuit is connected across between the positive pole and negative pole of charging voltage input (being the charger input), and the dividing potential drop on one of them resistance (being resistance R 2) is sampling voltage.Described detection comparing unit comprises the first triode Q1, described sampling voltage provides bias voltage for the base stage of the described first triode Q1, the described first triode Q1 conducting, and obtaining the overvoltage condition amount of charging voltage input (being the charger input) from the collector electrode of this triode, the emitter of the described first triode Q1 connects the negative pole of charging voltage input (being the charger input).Charging voltage is divided pressure-controlled Q1 whether conducting by R1 and R2, and when charging input overvoltage, the pressure drop that the R2 dividing potential drop obtains causes the Q1 conducting greater than the conducting valve limit value (being generally 0.7V) of Q1; When charging input voltage during in normal range (NR), the pressure drop on the R2 is less than 0.7V, Q1 by.
Certainly, above-mentioned detection comparing unit can also be realized by devices such as comparison amplifiers, might not adopt circuit shown in Figure 2, and similarly, the realization of voltage sample unit also can be adopted voltage detecting integrated chip exclusively.
The specific implementation of delay control circuit 102 shown in Figure 1 can be referring to the physical circuit of Fig. 2.
As shown in Figure 2, described delay control circuit 102 comprises the pull-up resistor R3 and the second triode Q2, the base stage of the described second triode Q2 is by the positive pole of pull-up resistor R3 connection charging voltage input (being the charger input), and the emitter of the described second triode Q2 connects the negative pole of charging voltage input (being the charger input); The overvoltage condition amount of charging input voltage detection circuit 101 output is used to clamp down on the bias voltage of the described second triode Q2 base stage, Q2 is ended and produces the control signal that makes first switching circuit 103 and 104 shutoffs of second switch circuit;
Described delay circuit comprises charging capacitor C1, the two ends of this charging capacitor C1 are connected across between the base stage and emitter of the described second triode Q2, this charging capacitor C1 obtains the electric weight charging by described pull-up resistor R3 from charging voltage input (being the charger input), and makes the described second triode Q2 conducting produce the control signal that makes first switching circuit 103 and second switch circuit 104 closures.As shown in Figure 2, when charging input overvoltage, the first triode Q1 conducting (pressure drop of collector and emitter is generally 0.3V), the base voltage that causes the second triode Q2 at once is 0.3V, less than the conducting valve limit value (being generally 0.7V) of the second triode Q2, cause the second triode Q2 by; When charging input voltage during in normal range (NR), the first triode Q1 by, charging input voltage through on draw R3 to charging capacitor C1 charging, make charging capacitor C1 go up pressure drop slowly rise (for the time-delay process), when charging capacitor C1 goes up pressure drop greater than 0.7V, the second triode Q2 conducting.
The fairly simple circuit of above-mentioned employing has promptly been realized the function of delay control circuit 102, and certainly, above-mentioned control signal generation circuit and delay circuit can also be realized by other modes, get final product as the integrated chip that adopts identical function.
At said apparatus, the present invention also provides a kind of method of terminal equipment charging overvoltage protective accordingly, and as shown in Figure 3, its process is as follows:
A, affirmation charger insert;
B, detect the voltage status of charger inputs by charging input voltage detection circuit 101;
Whether C, judgement detect the charging voltage of charger more than or equal to overvoltage protection valve limit value; If, execution in step D then; If not, execution in step E then;
D, send control signal, make the shutoff (promptly controlling the VCHG circuit disconnects) of first switching circuit 103 and second switch circuit 104, and return step B by delay control circuit 102;
E, send control signal, make first switching circuit 103 and 104 timing closings of second switch circuit (it is closed simultaneously promptly to control VCHG circuit and CH_CTR circuit) by delay control circuit 102, thereby by battery management chip control battery charge, and return step B.
In the said method, described delay control circuit charges by the electric capacity that adopts the RC series circuit and realizes delay effect, as shown in Figure 2.
In sum, of the present invention simple in structure, convenient and swift, and effectively, reliably.
Illustrating of above-mentioned each concrete steps is comparatively concrete, can not therefore think the restriction to scope of patent protection of the present invention, and scope of patent protection of the present invention should be as the criterion with claims.
Claims (10)
1, a kind of terminal equipment charging overvoltage protective device, it is used for the terminal equipment charging system, this system comprise the battery management chip that management whole terminal power supply is supplied with and be serially connected in the charging voltage input and the cell voltage input between charge switch circuit; It is characterized in that described device comprises:
The detection charger that first switching circuit, this switching circuit are serially connected in charging voltage input and battery management chip plugs and unplugs between the state-detection input; The detection charger of described battery management chip plugs and unplugs the state-detection input by detecting input voltage, judges that charger inserts or extracts;
Second switch circuit, this switching circuit are serially connected between the charging control output end of the control end of charge switch circuit and battery management chip; The charging control output end of described battery management chip is used for controlling described charge switch circuit conducting when having detected the charger insertion;
The charging input voltage detection circuit is used to detect the voltage swing of charging voltage input, and sends detected status signal to delay control circuit;
And delay control circuit, be used for producing control signal according to the testing result of described charging input voltage detection circuit, and this control signal is sent to the control end of first switching circuit and second switch circuit: the voltage of the charging voltage input that is detected when described charging input voltage detection circuit is during more than or equal to overvoltage protection valve limit value, and described delay control circuit turn-offs first switching circuit and second switch circuit; The voltage of the charging voltage input that is detected when described charging input voltage detection circuit is during less than overvoltage protection valve limit value, and described delay control circuit makes first switching circuit and second switch closing of circuit.
2, device according to claim 1 is characterized in that, described charging input voltage detection circuit comprises:
The voltage sample unit is used for obtaining sampling voltage from the charging voltage input;
And detect comparing unit, be used for described sampling voltage is compared with voltage protection valve limit value, and the output testing result is given described delay control circuit.
3, device according to claim 2 is characterized in that, described voltage sample unit adopts the resistance sampling circuit of being made up of two series resistances, and this resistance sampling circuit is connected across between the positive pole and negative pole of charging voltage input.
4, device according to claim 2, it is characterized in that, described detection comparing unit comprises first triode, described sampling voltage provides bias voltage for the base stage of described first triode, the described first triode conducting, and obtaining the overvoltage condition amount of charging voltage input from the collector electrode of this triode, the emitter of described first triode connects the negative pole of charging voltage input.
5, device according to claim 1 is characterized in that, described delay control circuit also comprises a delay circuit, is used to prolong the time that described control signal produces.
6, device according to claim 5, it is characterized in that, described delay control circuit comprises the pull-up resistor and second triode, the base stage of described second triode is by the positive pole of pull-up resistor connection charging voltage input, and the emitter of described second triode connects the negative pole of charging voltage input; The overvoltage condition amount of described charging input voltage detection circuit output is used to clamp down on the bias voltage of described second transistor base, make this triode by and produce the control signal that first switching circuit and second switch circuit are turn-offed;
Described delay circuit is a charging capacitor, the two ends of this charging capacitor are connected across between the base stage and emitter of described second triode, this charging capacitor obtains the electric weight charging by described pull-up resistor from the charging voltage input, and makes the described second triode conducting produce the control signal that makes first switching circuit and second switch closing of circuit.
7, device according to claim 1, it is characterized in that, described first switching circuit and second switch circuit adopt all-controlling power electronics device, and it comprises gate level turn-off thyristor, electric power thyristor, power transistor, electric power field effect transistor and igbt.
8, device according to claim 1 is characterized in that, described charge switch circuit adopts the charging triode; Described second switch circuit is serially connected between the charging triode control output end of charging base stage of triode and battery management chip.
9, a kind of method of terminal equipment charging overvoltage protective, it adopts charger to give described terminal equipment charging, it is characterized in that described method is carried out according to the following steps:
A, affirmation charger insert;
B, detect the voltage status of charger input by the charging input voltage detection circuit;
Whether C, judgement detect the charging voltage of charger more than or equal to overvoltage protection valve limit value; If, execution in step D then; If not, execution in step E then;
D, send control signal, make the shutoff of first switching circuit and second switch circuit, and return step B by delay control circuit;
E, send control signal, make first switching circuit and second switch circuit delay closure by delay control circuit, thereby by battery management chip control battery charge, and return step B.
10, method according to claim 9 is characterized in that, in the described step e, described delay control circuit charges by the electric capacity that adopts the RC series circuit and realizes delay effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100769803A CN100536273C (en) | 2007-09-12 | 2007-09-12 | Terminal equipment charging overvoltage protective device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100769803A CN100536273C (en) | 2007-09-12 | 2007-09-12 | Terminal equipment charging overvoltage protective device and method |
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| CN101119020A CN101119020A (en) | 2008-02-06 |
| CN100536273C true CN100536273C (en) | 2009-09-02 |
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| CNB2007100769803A Expired - Fee Related CN100536273C (en) | 2007-09-12 | 2007-09-12 | Terminal equipment charging overvoltage protective device and method |
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| TW201234733A (en) * | 2011-02-15 | 2012-08-16 | Whole Win Technology Ltd | Battery circuit protection module and battery module thereof |
| CN102136717A (en) * | 2011-03-22 | 2011-07-27 | 惠州Tcl移动通信有限公司 | Charger and charging protection device |
| CN102496995B (en) * | 2011-12-16 | 2014-01-01 | 湖南工业大学 | A lithium battery charging power management method and system |
| KR101440888B1 (en) * | 2011-12-27 | 2014-09-17 | 삼성에스디아이 주식회사 | Battery protection circuit |
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| CN108923488B (en) * | 2018-07-23 | 2024-05-14 | 浙江特康电子科技有限公司 | Battery charging management system |
| CN108832696A (en) * | 2018-07-27 | 2018-11-16 | 苏州市博得立电源科技有限公司 | Lithium battery pack |
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| CN111009950A (en) * | 2019-12-31 | 2020-04-14 | 深圳市德兰明海科技有限公司 | Overcharge protection circuit and charger |
| JP7466338B2 (en) * | 2020-03-13 | 2024-04-12 | 東芝ライフスタイル株式会社 | Vacuum cleaner |
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