CN102647011A - Buck-boost-integrated wide-range-output automatic-load-detection mobile power circuit - Google Patents
Buck-boost-integrated wide-range-output automatic-load-detection mobile power circuit Download PDFInfo
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- CN102647011A CN102647011A CN201210147594XA CN201210147594A CN102647011A CN 102647011 A CN102647011 A CN 102647011A CN 201210147594X A CN201210147594X A CN 201210147594XA CN 201210147594 A CN201210147594 A CN 201210147594A CN 102647011 A CN102647011 A CN 102647011A
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Abstract
The invention relates to a buck-boost-integrated wide-range-output automatic-load-detection mobile power circuit. The buck-boost-integrated wide-range-output automatic-load-detection mobile power circuit comprises a chargeable battery, a charging and protecting circuit, a buck-boost-integrated circuit, an automatic load detection circuit, a controller, a reference voltage circuit and a pulse modulation circuit, wherein the charging and protecting circuit is used for charging the chargeable battery, the buck-boost-integrated circuit is used for the wide-range output of the chargeable battery, and the pulse modulation circuit is used for modulating the pulse widths of a first electronic switch and a second electronic switch. According to the buck-boost-integrated wide-range-output automatic-load-detection mobile power circuit, the overvoltage, overcurrent and overtemperature protection of a mobile power charging circuit and the buck-boost-integrated wide-range voltage output of a mobile power discharging circuit can be simultaneously realized, and the function that whether a load is accessed or not can be automatically detected can be realized, so that the buck-boost-integrated wide-range-output automatic-load-detection mobile power circuit has the advantages of powerful function, simple circuit, low cost and convenience in production.
Description
Technical field
The present invention relates to the charge-discharge circuit of portable power source, be specifically related to the portable power source circuit of the integrated wide region output of buck Auto-Sensing load.
Background technology
Continuous development along with science and technology; The application of mobile electronic devices such as notebook, MP3, digital camera, mobile phone has become the important step in present people's life, the work, yet existing mobile device is internal battery; Its battery capacity is limited; Especially for mobile phone, under situation about can't charge, can bring inconvenience in going on business or travelling to people's work and life.Portable power source can address the above problem as a kind of portable charger that integrates power supply and charge function.
Existing portable power source includes charging circuit and discharge circuit; Usually, in charging circuit, some protective circuits, for example current foldback circuit, overvoltage crowbar and thermal-shutdown circuit etc. can be set independently; These protective circuits can prevent the damage of rechargeable battery in charging process in the portable power source; But because these protective circuits are independent the setting, complex circuit, integrated level is high, cost is high; Discharge circuit generally is to provide to a certain mobile electronic device or mobile electronic device with identical input voltage; Therefore; Power supply to mobile electronic device all is to need special matching used portable power source just can use, and wastes resource like this, and when carrying multiple mobile electronic device; Need to cooperate and carry multiple portable power source, carry also inconvenient; Existing portable power source does not have load (being meant the mobile electronic device that adopts the portable power source power supply) Auto-Sensing function simultaneously, and non-loaded access is promptly arranged, and portable power source all can be lossy, wastes energy.
Summary of the invention
Deficiency to prior art; The object of the invention is intended to provide a kind of charging circuit to have overcurrent, overvoltage, overheat protector function; And the output of the integrated wide region of rechargeable battery buck also has under-voltage protection function, but and the portable power source circuit of the Auto-Sensing integrated wide region output of the buck Auto-Sensing load that whether has load to insert.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
The portable power source circuit of the integrated wide region output of buck Auto-Sensing load, it comprises:
One rechargeable battery;
One is used to the charging and the protective circuit of said rechargeable battery charging, and said charging and protective circuit comprise charging circuit and the 3rd electronic switch, and charging circuit is connected to the positive pole of rechargeable battery through the 3rd electronic switch;
One is used for the buck integrated circuit of rechargeable battery wide region output; Said buck integrated circuit comprises first electronic switch, second electronic switch, diode D1, diode D2, inductance L 1, and said first electronic switch links to each other with the positive pole of rechargeable battery, and an end of inductance L 1 links to each other with first electronic switch; The other end is connected to the anode of diode D2; The negative electrode of diode D1 is connected between first electronic switch and the inductance L 1, its plus earth, and one of second electronic switch is terminated between inductance L 1 and the diode D2; Other end ground connection, the negative electrode of diode D2 can link to each other with load;
One Auto-Sensing load circuit; Said Auto-Sensing load circuit comprises amplifying circuit and resistance R 1, and one of said resistance R 1 is connected to the negative electrode of diode D2, other end ground connection; The input of amplifying circuit is connected between resistance R 1 and the diode D2, and its output is connected to controller;
One controller; Said controller links to each other respectively with first electronic switch, second electronic switch, the 3rd electronic switch, the work that is used to control first electronic switch, second electronic switch, the 3rd electronic switch whether, rechargeable battery anodal also electrically connects with this controller;
One reference voltage circuit; And
One is used to modulate the pulse modulated circuit of the pulse duration of first electronic switch, second electronic switch, and said pulse modulated circuit and reference voltage circuit all electrically connect with controller.
As a kind of execution mode, said reference voltage circuit comprises parallel voltage-stabilizing integrated chip U1, resistance R 2, the plus earth of said chip U1, and its negative electrode is connected to controller through resistance R 2, and it is connected with its negative electrode with reference to the utmost point, with reference to the utmost point and be connected to controller.
Preferably, said parallel voltage-stabilizing integrated chip U1 is TL431.
As another kind of execution mode; Said reference voltage circuit comprises voltage-stabiliser tube U2, capacitor C 2, capacitor C 3; The input of voltage-stabiliser tube U2 is connected to a power supply VCC; Its output is connected to controller, and the input of voltage-stabiliser tube U2 also is connected to the earth terminal of voltage-stabiliser tube U2 through capacitor C 2, and the output of voltage-stabiliser tube U2 also is connected to the earth terminal of voltage-stabiliser tube U2 through capacitor C 3.
Preferably, said voltage-stabiliser tube U2 is HT7533.
Preferably, said first electronic switch, second electronic switch and the 3rd electronic switch are a kind of in triode, metal-oxide-semiconductor, relay or the controllable silicon.
Preferably, said controller is HT46R065.
Preferably, said buck integrated circuit also comprises a capacitor C 1, and the positive pole of said capacitor C 1 is connected to the negative electrode of diode D2, its minus earth.
The portable power source circuit of the integrated wide region output of the buck that the present invention set forth Auto-Sensing load, compared with prior art, its beneficial effect is:
1, in charging circuit, sets up electronic switch, when problem such as overvoltage, overcurrent, excess temperature when rechargeable battery charges, occurring, can in time cut off charging circuit, need not to be provided with in addition protective circuit, practice thrift cost, circuit is simple and easy to realize;
2, the buck integrated circuit is set in the discharge circuit of portable power source, can makes portable power source realize the output of wide voltage, practice thrift cost and easy to carry;
3, Auto-Sensing has non-loaded access function, can make portable power source zero-power when not using, energy savings;
4, circuit is simple, and cost is low, and convenient production is powerful.
Description of drawings
Accompanying drawing 1 is the circuit theory diagrams of the portable power source circuit of the integrated wide region output of buck of the present invention Auto-Sensing load;
Accompanying drawing 2 is the circuit theory diagrams of a kind of execution mode of reference voltage circuit;
Accompanying drawing 3 is the circuit theory diagrams of the another kind of execution mode of reference voltage circuit.
Embodiment
Below, in conjunction with accompanying drawing and embodiment, the portable power source circuit of the integrated wide region of buck of the present invention output Auto-Sensing load done further describing, so that clearerly understand the present invention's technological thought required for protection.
As shown in Figure 1, the portable power source circuit of the integrated wide region output of buck Auto-Sensing load, it comprises rechargeable battery BAT1; Be used to the charging and the protective circuit 1 of rechargeable battery BAT1 charging, charging and protective circuit 1 comprise charging circuit 11 and the 3rd electronic switch K3, and charging circuit 11 is connected to the positive pole of rechargeable battery BAT1 through the 3rd electronic switch K3; The buck integrated circuit 2 that is used for the output of rechargeable battery wide region; Buck integrated circuit 2 comprises that the first electronic switch K1, the second electronic switch K2, diode D1, diode D2, inductance L 1, the first electronic switch K1 link to each other with the positive pole of rechargeable battery BAT1, and an end of inductance L 1 links to each other with the first electronic switch K1; The other end is connected to the anode of diode D2; The negative electrode of diode D1 is connected between first electronic switch and the inductance L 1, its plus earth, and one of the second electronic switch K2 is terminated between inductance L 1 and the diode D2; Other end ground connection, the negative electrode of diode D2 can link to each other with load 3; The Auto-Sensing load circuit; The Auto-Sensing load circuit comprises amplifying circuit 5 and resistance R 1; One of resistance R 1 is connected to the negative electrode of diode D2, other end ground connection, and the input of amplifying circuit is connected between resistance R 1 and the diode D2; Its output is connected to controller 4; Controller 4 links to each other respectively with the first electronic switch K1, the second electronic switch K2, the 3rd electronic switch K3, the work that is used to control the first electronic switch K1, the second electronic switch K2, the 3rd electronic switch K3 whether, rechargeable battery BAT1 anodal also electrically connects with this controller 4; Reference voltage circuit 6, and the pulse modulated circuit 7 that is used to modulate the pulse duration of the first electronic switch K1, the second electronic switch K2, pulse modulated circuit 7 all electrically connects with controller with reference voltage circuit 6.
Operation principle
1, charge protection function comprises overvoltage protection, under-voltage protection, overcurrent protection and overheat protector etc.Wherein,
Over-charge protective: when 11 couples of rechargeable battery BAT1 of charging circuit charge; Controller 4 is supervised the voltage of rechargeable battery BAT1 always; When magnitude of voltage during greater than the protection voltage of rechargeable battery BAT1 (setting voltage of rechargeable battery BAT1 is 4.2V in the general portable power source); Controller 4 cuts out the 3rd electronic switch K3, and charging circuit 11 stops charging, and protection rechargeable battery BAT1 avoids overvoltage and damages.
Under-voltage protection: usually; The voltage of rechargeable battery BAT1 is below 3.0V, and basic energy is very little, and simultaneously general rechargeable battery BAT1 discharge back voltage can not be lower than 2.2V; If be lower than this value, can cause the permanent damage of rechargeable battery BAT1.General under-voltage protection value is 2.8V, and is identical with the overvoltage protection principle, when controller 4 monitoring rechargeable battery BAT1 are lower than 2.8V, closes the first electronic switch K1 and the second electronic switch K3, stops the discharge work of rechargeable battery BAT1.At this moment, controller 4 gets into low power consumpting state, does not work, and power consumption seldom is similar to zero-power.
The reference voltage of overvoltage protection and under-voltage protection realizes that through reference voltage circuit implementation procedure is following:
At first carry out AD sampling and computing, draw battery voltage value, calculate as follows through controller 4:
The AD value of sampling reference voltage.Through the calculating of following formula formula,, just can know cell voltage when the AD of the reference voltage of sampling out value.
Below for calculating rechargeable battery BAT1 voltage method and illustrating; As illustrated in fig. 1 and 2, reference voltage circuit comprises parallel voltage-stabilizing integrated chip U1, resistance R 2, the plus earth of said chip U1; Its negative electrode is connected to controller 4 through resistance R 2; It is connected with its negative electrode with reference to the utmost point, and with reference to the utmost point and be connected to controller 4, parallel voltage-stabilizing integrated chip U1 adopts TL431.The operating voltage of controller 4 adopts rechargeable battery BAT1 voltage; So can know; The AD value of sampling supply voltage is exactly the peak of the precision of CPU, and for example: be employed in the preferred embodiment of the present invention, controller 4 adopts HT46R064; Its AD precision is: 12 AD, the corresponding AD value of supply voltage of controller 4 is: 4096.For example, adopts reference voltage to CPU when adopting the benchmark of chip TL431 voltage stabilizing output 2.5V; Cell voltage is under the situation of 4.0V; IO1 end input one high level (by CPU output) of parallel voltage-stabilizing integrated chip U1 is held the reference voltage that just produces a 2.5V at the IO2 of parallel voltage-stabilizing integrated chip U1.So corresponding sampled value is: 2560 AD value.Can get 2560 the above-mentioned formula of AD value substitution that samples:
The voltage of rechargeable battery BAT1=(2.5V*4096)/2560=4.0V.
The 4.0V that draws has been exactly a battery voltage value.
Certainly; Above-mentioned is the reference voltage sample circuit that adopts parallel voltage-stabilizing integrated chip U1 to realize; Also can adopt voltage-stabiliser tube as shown in Figure 3 to realize the sample circuit of reference voltage, the input of voltage-stabiliser tube U2 is connected to a power supply VCC, and its output is connected to controller; The input of voltage-stabiliser tube U2 also is connected to the earth terminal of voltage-stabiliser tube U2 through capacitor C 2; The output of voltage-stabiliser tube U2 also is connected to the earth terminal of voltage-stabiliser tube U2 through capacitor C 3, and it is identical with above-mentioned principle, and voltage-stabiliser tube U2 can adopt HT7533 type voltage-stabiliser tube.
Overcurrent protection: overcurrent protection is identical with the principle of overvoltage protection; When 11 couples of rechargeable battery BAT1 of charging circuit charge; Controller 4 is supervised the electric current of the rechargeable battery BAT1 that flows through always, and when current value during greater than the protective current of rechargeable battery BAT1, controller 4 cuts out the 3rd electronic switch K3; Charging circuit 11 quits work, and protection rechargeable battery BAT1 avoids overcurrent and damages.
Temperature protection: the AD value of the sampling sensor that controller 4 carries, monitoring rechargeable battery BAT1 variation of temperature when temperature is too high, is taked to handle immediately, avoids too high and produce damage such as blast grade by excess temperature.For example: when charging for rechargeable battery BAT1, cell voltage occurs too high, stops charging at once.When rechargeable battery BAT1 discharged, battery temperature occurred too high, stopped output.
2, the principle of the integrated wide region output circuit of buck:
Step-down operation principle: when the first electronic switch K1 conducting; Diode D1 ends, and the voltage of input is load 3 chargings (this moment, the second electronic switch K2 closed) through the first electronic switch K1, inductance L 1, diode D2, in addition in the buck integrated circuit; Also comprise a capacitor C 1; The positive pole of said capacitor C 1 is connected to the negative electrode of diode D2, its minus earth, and the discharge voltage of 1 couple of rechargeable battery BAT1 of this capacitor C carries out filtering.In the charging process of load 3, because inductance L 1 is an energy-storage travelling wave tube, its energy storage energy constantly increases.When the first electronic switch K1 closes; Inductance L 1 induces the negative right positive voltage in a left side; Discharge the energy in the inductance L 1 through diode D1, the discharge voltage of this voltage direction and chargeable battery BAT1 is in the opposite direction, makes the discharge voltage of the voltage of arrival load less than rechargeable battery BAT1 after the two stack; Realized buck functionality
The operation principle of boosting: during the first electronic switch K1 and second electronic switch K2 conducting simultaneously; The output voltage of rechargeable battery is through second electronic switch K2 discharge; Inductance L 1 is carried out energy storage, when closing the second electronic switch K2 when the first electronic switch K1 conducting, because inductance has the characteristic that electric current can not suddenly change; Inductance L 1 releases energy through diode D2; The voltage mutual superposition that the output voltage of rechargeable battery BAT1 and inductance L 1 produce, this voltage is higher than the output voltage of rechargeable battery BAT1, thereby realizes boosting output.
Whether work through controlling the first electronic switch K1 and the second electronic switch K2; Can realize the wide voltage output of rechargeable battery BAT1; The concrete booster voltage scope and the height of step-down voltage scope are by the pulse duration decision of the first electronic switch K1 and the second electronic switch K2, and the pulse duration of the two is then controlled by pulse modulated circuit.
In preferred embodiment of the present invention, the first electronic switch K1 and the second electronic switch K2 and the 3rd electronic switch K3 all can adopt any in the electronic switches such as triode, metal-oxide-semiconductor, controllable silicon, relay.
3, Auto-Sensing loading functional:
When load inserts portable power source, rechargeable battery will have electric current to export to this load, and this electric current adopts the back to produce a small voltage through resistance R 1, and this small voltage is sent into controller 4 through amplifying circuit 5 and sampled.
If when not having load to insert, do not have pressure drop on the resistance R 1, just controller 4 is sampled less than magnitude of voltage so.Controller can compare according to size of current and the sample rate current set, thereby makes next step operation, for example, sets the size of load current, if set the electric current output of 1A, surpasses 1A and just closes output.For example after the start, pulled out load, detected when not having load, shutdown output automatically.
For a person skilled in the art, can make other various corresponding changes and distortion, and these all changes and distortion should belong within the protection range of claim of the present invention all according to the technical scheme and the design of above description.
Claims (8)
1. the integrated wide region of buck is exported the portable power source circuit of Auto-Sensing load, it is characterized in that it comprises:
One rechargeable battery;
One is used to the charging and the protective circuit of said rechargeable battery charging, and said charging and protective circuit comprise charging circuit and the 3rd electronic switch, and charging circuit is connected to the positive pole of rechargeable battery through the 3rd electronic switch;
One is used for the buck integrated circuit of rechargeable battery wide region output; Said buck integrated circuit comprises first electronic switch, second electronic switch, diode D1, diode D2, inductance L 1, and said first electronic switch links to each other with the positive pole of rechargeable battery, and an end of inductance L 1 links to each other with first electronic switch; The other end is connected to the anode of diode D2; The negative electrode of diode D1 is connected between first electronic switch and the inductance L 1, its plus earth, and one of second electronic switch is terminated between inductance L 1 and the diode D2; Other end ground connection, the negative electrode of diode D2 can link to each other with load;
One Auto-Sensing load circuit; Said Auto-Sensing load circuit comprises amplifying circuit and resistance R 1, and one of said resistance R 1 is connected to the negative electrode of diode D2, other end ground connection; The input of amplifying circuit is connected between resistance R 1 and the diode D2, and its output is connected to controller;
One controller; Said controller links to each other respectively with first electronic switch, second electronic switch, the 3rd electronic switch, the work that is used to control first electronic switch, second electronic switch, the 3rd electronic switch whether, rechargeable battery anodal also electrically connects with this controller;
One reference voltage circuit; And
One is used to modulate the pulse modulated circuit of the pulse duration of first electronic switch, second electronic switch, and said pulse modulated circuit and reference voltage circuit all electrically connect with controller.
2. the portable power source circuit of the integrated wide region output of buck according to claim 1 Auto-Sensing load; It is characterized in that; Said reference voltage circuit comprises parallel voltage-stabilizing integrated chip U1, resistance R 2, the plus earth of said chip U1, and its negative electrode is connected to controller through resistance R 2; It is connected with its negative electrode with reference to the utmost point, with reference to the utmost point and be connected to controller.
3. the portable power source circuit of the integrated wide region output of buck according to claim 2 Auto-Sensing load is characterized in that said parallel voltage-stabilizing integrated chip is TL431.
4. the portable power source circuit of the integrated wide region output of buck according to claim 1 Auto-Sensing load; It is characterized in that; Said reference voltage circuit comprises voltage-stabiliser tube U2, capacitor C 2, capacitor C 3, and the input of voltage-stabiliser tube U2 is connected to a power supply VCC, and its output is connected to controller; The input of voltage-stabiliser tube U2 also is connected to the earth terminal of voltage-stabiliser tube U2 through capacitor C 2, and the output of voltage-stabiliser tube U2 also is connected to the earth terminal of voltage-stabiliser tube U2 through capacitor C 3.
5. the portable power source circuit of the integrated wide region output of buck according to claim 4 Auto-Sensing load is characterized in that said voltage-stabiliser tube U2 is HT2533.
6. the portable power source circuit of the integrated wide region output of buck according to claim 1 Auto-Sensing load; It is characterized in that said first electronic switch, second electronic switch and the 3rd electronic switch are a kind of in triode, metal-oxide-semiconductor, relay or the controllable silicon.
7. the portable power source circuit of the integrated wide region output of buck according to claim 1 Auto-Sensing load is characterized in that said controller is HT46R065.
8. the portable power source circuit of the integrated wide region output of buck according to claim 1 Auto-Sensing load; It is characterized in that; Said buck integrated circuit also comprises a capacitor C 1, and the positive pole of said capacitor C 1 is connected to the negative electrode of diode D2, its minus earth.
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| CN201210147594XA CN102647011A (en) | 2012-04-10 | 2012-04-10 | Buck-boost-integrated wide-range-output automatic-load-detection mobile power circuit |
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| CN201210147594XA CN102647011A (en) | 2012-04-10 | 2012-04-10 | Buck-boost-integrated wide-range-output automatic-load-detection mobile power circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102891512A (en) * | 2012-09-25 | 2013-01-23 | 深圳市瑞信集成电路有限公司 | Control chip of mobile power supply and working control method of mobile power supply |
| CN103715745A (en) * | 2014-01-16 | 2014-04-09 | 兰相球 | Series battery |
| CN103812197A (en) * | 2014-03-04 | 2014-05-21 | 深圳市华宝新能源有限公司 | Mobile power supply |
| CN104698263A (en) * | 2013-12-09 | 2015-06-10 | 惠州市吉瑞科技有限公司 | System and method for detecting power supply voltages and power supply system |
| WO2015107267A1 (en) * | 2014-01-20 | 2015-07-23 | Nokia Corporation | Methods and apparatus for battery characteristic conversion |
| CN105353243A (en) * | 2015-11-13 | 2016-02-24 | 魅族科技（中国）有限公司 | Load access automatic detection circuit and socket |
| CN106786957A (en) * | 2017-01-12 | 2017-05-31 | 东莞市德尔能新能源股份有限公司 | A kind of portable car-mounted charging system |
| CN109149509A (en) * | 2018-09-27 | 2019-01-04 | 郑州云海信息技术有限公司 | A kind of power supply protection device and method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102891512A (en) * | 2012-09-25 | 2013-01-23 | 深圳市瑞信集成电路有限公司 | Control chip of mobile power supply and working control method of mobile power supply |
| CN104698263A (en) * | 2013-12-09 | 2015-06-10 | 惠州市吉瑞科技有限公司 | System and method for detecting power supply voltages and power supply system |
| CN103715745A (en) * | 2014-01-16 | 2014-04-09 | 兰相球 | Series battery |
| WO2015107267A1 (en) * | 2014-01-20 | 2015-07-23 | Nokia Corporation | Methods and apparatus for battery characteristic conversion |
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| CN103812197A (en) * | 2014-03-04 | 2014-05-21 | 深圳市华宝新能源有限公司 | Mobile power supply |
| CN103812197B (en) * | 2014-03-04 | 2017-01-11 | 深圳市华宝新能源股份有限公司 | Mobile power supply |
| CN105353243A (en) * | 2015-11-13 | 2016-02-24 | 魅族科技（中国）有限公司 | Load access automatic detection circuit and socket |
| CN105353243B (en) * | 2015-11-13 | 2018-10-19 | 珠海市魅族科技有限公司 | A kind of circuit and socket of automatic detection load access |
| CN106786957A (en) * | 2017-01-12 | 2017-05-31 | 东莞市德尔能新能源股份有限公司 | A kind of portable car-mounted charging system |
| CN106786957B (en) * | 2017-01-12 | 2019-11-19 | 东莞市德尔能新能源股份有限公司 | A kind of portable car-mounted charging system |
| CN109149509A (en) * | 2018-09-27 | 2019-01-04 | 郑州云海信息技术有限公司 | A kind of power supply protection device and method |
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