CN100486076C - Method and device for switching supply power and protecting batteries - Google Patents
Method and device for switching supply power and protecting batteries Download PDFInfo
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- CN100486076C CN100486076C CNB2005100867493A CN200510086749A CN100486076C CN 100486076 C CN100486076 C CN 100486076C CN B2005100867493 A CNB2005100867493 A CN B2005100867493A CN 200510086749 A CN200510086749 A CN 200510086749A CN 100486076 C CN100486076 C CN 100486076C
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Abstract
The invention suits to the mobile or handy equipment system. This method includes the following steps: adding a battery switch on the battery power supply branch; depending on the battery switch conduction, the method realizes switching between external power and the battery power and controlling over the battery charging/ discharging states. This method and means controls the battery switch to realize switching between the external power and the battery for adapting the various system states. It also offers protection on battery charging and discharging. On one side, it avoids over-charging to damage the battery. On the other side, it avoids the battery supplying power to the system in the period of external power supplying. This affects the time of the battery independent work. It also extends the battery life and the battery supplying time.
Description
Technical field
The present invention relates in a kind of employing external power supply and the battery supply set, the mutual switching of two kinds of power supplies particularly relates to when external power supply is powered, and prevents from the mistake of battery is put and the method and the device of over-charge protective.
Background technology
Along with the development of mobile device to miniaturization, multifunction, battery technology has also obtained significant progress, and at present, big capacity small size battery is as the secondary electrical supply popularization and application of hand-held and mobile device.Nonetheless, under many situations, the battery cost still occupies the entire equipment larger proportion, and the battery strict control with extending battery life, thereby is prolonged battery-powered time and becomes an indispensable link in the power management.
At a lot of mobile devices such as vehicle-mounted, hand-held and have in the equipment of uninterrupted power supply requirement, require power circuit that automatic switching function can be provided, promptly when the external power supply condition of power supply is arranged, switch to the external power supply power supply, and can when detecting the battery electric quantity deficiency, start charging, to guarantee that battery possesses sufficient electric energy, avoid that battery is not in saturation condition when needs use battery.When external power supply power supply stops, automatically switching to powered battery, and this handoff procedure should not cause the outage of equipment or reset, anomaly such as obliterated data.
At present, have a lot of producers that high efficiency electric power management circuit is provided, its main management function is absorbed in the control to battery charge, for the anti-overcharge of battery under the external power supply condition of power supply and prevented putting not providing and improve solution.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of power supply to switch and the method and the device of battery protection; be used to solve the protection battery electric quantity being arranged under the situation of external power supply and preventing to overcharge, can uninterruptedly switch to battery powered problem when losing external power supply.
To achieve these goals; the invention provides the method for a kind of power supply switching and battery protection; be applicable to and move or handhold device system; wherein; increase by a cell switch on the battery power branch road, the on/off by the control cell switch is implemented in the switching between external power supply and the battery supply and controls the charging and discharging state of described battery supply.
The method of described power supply switching and battery protection wherein, when adopting field effect transistor as cell switch, specifically comprises:
Step 21, the grid of described field effect transistor is connected with described external power supply or its control signal by a resistance that is used to detect described external power supply property working properly, and by switch triode control, this switch triode is again by the microprocessor control of being in charge of power supply;
Step 22 when no external power supply inserts, is opened described field effect transistor, by described battery supply supply system work; When having external power supply to insert, by described external power supply supply system work, and whether described battery supply is charged by the voltage decision that detects described battery supply, if described battery supply electric weight deficiency, then opening described field effect transistor charges to described battery supply, and after described battery supply charging finishes, close described field effect transistor.
The method of described power supply switching and battery protection wherein, detects the voltage of described battery supply by comparator or analog/digital converter.
The method of described power supply switching and battery protection, wherein, when described external power supply was working properly, described resistance was pulled to high level with the grid of described field effect transistor, and described field effect transistor is closed; When described external power supply disconnected, described resistance was pulled down to low level with the grid of described field effect transistor, and described field effect transistor is opened.
The method of described power supply switching and battery protection, wherein, described field effect transistor is the P-channel metal-oxide-semiconductor field effect transistor.
To achieve these goals; the present invention also provides the device of a kind of power supply switching and battery protection; be applicable to and move or handhold device system; comprise external power supply, battery supply, power management chip and connected voltage stabilization and current stabilization circuit; described power management chip is used for providing power supply and supervisory control system operating state to system; described voltage stabilization and current stabilization circuit is used for providing normal power to reach to system described battery supply is charged when electric weight is not enough, and wherein, this device also comprises:
One cell switch, it is connected to described external power supply by a resistance that is used to detect described external power supply property working properly, is used for switching between external power supply and battery supply;
One control and treatment circuit connects described power management chip, is used for controlling the unlatching of described cell switch or closing according to working state of system.
The device of described power supply switching and battery protection, wherein, when adopting field effect transistor as cell switch, when no external power supply inserted, described control and treatment circuit was opened described field effect transistor, by described battery supply supply system work; When having external power supply to insert, by described external power supply supply system work, and whether described battery supply is charged by the voltage decision that detects described battery supply, if described battery supply electric weight deficiency, then described control and treatment circuit is opened described field effect transistor, described voltage stabilization and current stabilization circuit charges to described battery supply, and after described battery supply charging finished, described control and treatment circuit was closed described field effect transistor.
The device of described power supply switching and battery protection wherein, detects the voltage of described battery supply by comparator or analog/digital converter.
The device of described power supply switching and battery protection, wherein, when described external power supply was working properly, described resistance was pulled to high level with the grid of described field effect transistor, and described control and treatment circuit is closed described field effect transistor; When described external power supply disconnected, described resistance was pulled down to low level with the grid of described field effect transistor, and described control and treatment circuit is opened described field effect transistor.
The device of described power supply switching and battery protection, wherein, described field effect transistor is the P-channel metal-oxide-semiconductor field effect transistor.
Technique effect of the present invention is:
Method and device that battery protection that the present invention proposes and external power supply and powered battery are switched are implemented between external power supply and the battery by the control cell switch and switch, with the different operating state of adaptive system.Simultaneously discharging and recharging of battery protected, prevented that on the one hand being full of the back at battery continues charging to damage battery, has prevented that on the other hand battery influences the time that battery works alone also to system's power supply during the external power supply power supply.In addition, battery useful life and battery-powered operation time have been prolonged.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is that power supply of the present invention switches and battery protecting apparatus figure;
Fig. 2 is that power supply of the present invention switches and battery protection control logic figure.
Embodiment
Technical problem to be solved by this invention provides a kind ofly to be switched between external power supply power supply and powered battery; and battery prevented method and the device putting and overcharge; solution can uninterruptedly switch to battery powered problem the protection battery electric quantity being arranged under the situation of external power supply and preventing to overcharge when losing external power supply.
For achieving the above object, the invention provides a kind of method of cell switch, comprise the steps:
Step 1 increases a FET (Field Effect Transistor, field effect transistor) pipe on the powered battery branch road.The grid of FET pipe is connected with external power supply (or signal of this power supply control) by resistance and controls by switch triode, the switch triode base stage is responsible for MCU (the Microcontroller Uint of power management by system, microprocessor) control (if power supply managing then can produce this control signal by hardware logic fully by the hardware realization).
Step 2, when no external power supply was powered, the grid control FET pipe of FET pipe was opened, by the battery supplied system works;
Step 3, when external power supply inserted, system detected cell voltage, if the electric weight deficiency is opened the FET pipe, charged to battery by Charge Management this moment.After battery is full of, close the FET pipe, to prevent over-charging of battery.Another effect of closing the FET pipe is in order to prevent that battery guarantees that also to system discharge battery always is in full state during external power work.
Further describe specific embodiments of the invention below in conjunction with accompanying drawing.
In the present invention, the concrete operation principle of power management chip is not discussed, even can not need power management chip, build the function that circuit is realized power management by discrete component fully, suppose that just power management partly finished the voltage stabilization and current stabilization function to external power supply, each road power supply of using in the output system is also not necessarily finished by processor for the control of cell switch, circuit can produce a signal as long as battery is full of the back, promptly can be used to control cell switch.
Be the installation drawing of power supply switching of the present invention and battery protection as shown in Figure 1, power management chip 101 of the present invention is connected between voltage stabilization and current stabilization circuit 102 and processor or the supervisory circuit 104, and cell switch 103 is serially connected in battery and the charging and discharging circuit.Below will be elaborated to each module.
1, power management chip 101
11), because modern comfort, especially power reguirements such as smart machine, handheld device complexity, processor core voltage, IO voltage, display part power supply have nothing in common with each other.Some design also requires to provide the voltage that still needs working portion after the shutdown, therefore adopts the power management chip 101 can simplified design, to improve reliability.
12), power management chip 101 is responsible for providing power supply to entire equipment, and each road power supply is monitored, and handles open and close machine flow process and start electric sequence etc. according to designing requirement.
13), for the comparatively perfect power management chip 101 of function, can with 104 processor part communications, 104 processors parts can be known the work at present state, and sends order to power management chip 101.
14), if system's power supply is very simple, also can not use special-purpose power management chip 101, and realize the control logic relation by simple discrete component.
2, the voltage stabilization and current stabilization circuit 102
It provides the normal power of system works, other each road power supplys are normal power acquisition thus all, because this normal power is used for battery charge, simultaneously after external power supply disconnects, powered battery also enters this road, so general design should be chosen the output area close with cell voltage.
3, cell switch 103
31), use P channel mosfet (Fetal-oxide semiconductor Field EffectTransistor among Fig. 1, metal oxide semiconductor field effect tube) pipe is as cell switch 103, and the polarity of control signal is identical with device property like this, can simplify circuit; Because MOSFET manages the effect of the parasitic diode in 103, the speed of battery incision power supply when external power supply disconnects be can accelerate simultaneously, system reliability and availability improved.
The grid of MOSFET pipe 103 is connected by resistance 105 and external power supply (or external power supply control signal), and control by switch triode 106, the base stage of switch triode 106 is responsible for MCU (the Microcontroller Uint of power management by system, microprocessor), be processor or supervisory circuit 104 controls, if power supply managing is realized by hardware fully, then can be produced this control signal by hardware logic.Wherein, the base stage current-limiting resistance when resistance 107 is switch triode 106 operate as normal, when switch triode 106 was field effect transistor, resistance 107 can omit.
32), if special requirement are arranged, also can adopt switching circuits such as other types power tube or relay as cell switch 103, require its switching speed must be enough soon to the selection of cell switch 103, can in time open powered battery can not satisfy the system works condition time to guarantee to drop at external supply voltage.Simultaneously because this cell switch 103 is serially connected in the current supply circuit during powered battery always, conducting resistance is as much as possible little in the time of must noting making cell switch 103 closures, leakage current is few as much as possible during shutoff, for guaranteeing the battery powered operating time, the circuit part that keeps cell switch 103 to open should consume electric current seldom.
Be that power supply of the present invention switches and battery protection control logic figure as shown in Figure 2, and consult Fig. 1:
After described step 203,204 is finished, change step 201, judge to carry out next round.
After being finished, described step 205 changes step 201, so that just often switch to the external power supply power supply at external power supply.
The inventive method is that a kind of effective solution has the power supply of plural service requirement to switch and to the guard method of battery; this method does not rely on distinctive power management techniques; but in the mode of cell switch; by under different conditions to the control of cell switch, realize the switching and the battery protection of power supply.This method can be in conjunction with the method based on power management chip and microprocessor control, making is not increasing under more cost and the complex circuit design condition, finish and control cell switch quickly and accurately, prolong the battery purpose in useful life to reach, can be widely used in moving and handheld device.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1, the method for a kind of power supply switching and battery protection; be applicable to and move or handhold device system; it is characterized in that; on the battery power branch road, increase by a cell switch; on/off by the control cell switch is implemented in the switching between external power supply and the battery supply and controls the charging and discharging state of described battery supply, comprises the steps:
Step 1, described cell switch is connected with the control signal of described external power supply or described external power supply by a resistance that is used to detect described external power supply property working properly, and by switch triode described cell switch is controlled, the base stage of described switch triode is responsible for the MCU control of power management by system;
Step 2 when no external power supply inserts, is opened described cell switch, by described battery supply supply system work; When having external power supply to insert, by described external power supply supply system work, and whether described battery supply is charged by the voltage decision that detects described battery supply, if described battery supply electric weight deficiency, then opening described cell switch charges to described battery supply, and after described battery supply charging finishes, close described cell switch.
2, the method for power supply switching according to claim 1 and battery protection is characterized in that, when adopting field effect transistor as cell switch, specifically comprises:
Step 21, the grid of described field effect transistor is connected with the control signal of described external power supply or described external power supply by a resistance that is used to detect described external power supply property working properly, and by switch triode control, this switch triode is again by the microprocessor control of being in charge of power supply;
Step 22 when no external power supply inserts, is opened described field effect transistor, by described battery supply supply system work; When having external power supply to insert, by described external power supply supply system work, and whether described battery supply is charged by the voltage decision that detects described battery supply, if described battery supply electric weight deficiency, then opening described field effect transistor charges to described battery supply, and after described battery supply charging finishes, close described field effect transistor.
3, the method for power supply switching according to claim 2 and battery protection is characterized in that, detects the voltage of described battery supply by comparator or analog/digital converter.
4, the method for power supply switching according to claim 2 and battery protection is characterized in that when described external power supply was working properly, described resistance was pulled to high level with the grid of described field effect transistor, and described field effect transistor is closed; When described external power supply disconnected, described resistance was pulled down to low level with the grid of described field effect transistor, and described field effect transistor is opened.
5, according to the method for claim 2,3 or 4 described power supplies switchings and battery protection, it is characterized in that described field effect transistor is the P-channel metal-oxide-semiconductor field effect transistor.
6, the device of a kind of power supply switching and battery protection; be applicable to and move or handhold device system; comprise external power supply, battery supply, power management chip; and the voltage stabilization and current stabilization circuit that is connected with described power management chip; described power management chip is used for providing power supply and supervisory control system operating state to system; described voltage stabilization and current stabilization circuit is used for providing normal power to reach to system and described battery supply is charged when electric weight is not enough, it is characterized in that, also comprises:
One cell switch, it is connected to described external power supply by a resistance that is used to detect described external power supply property working properly, is used for switching between external power supply and battery supply;
One control and treatment circuit connects described power management chip, is used for controlling the unlatching of described cell switch or closing according to working state of system.
7, the device of power supply switching according to claim 6 and battery protection, it is characterized in that, when adopting field effect transistor, when no external power supply inserts as cell switch, described control and treatment circuit is opened described field effect transistor, by described battery supply supply system work; When having external power supply to insert, by described external power supply supply system work, and whether described battery supply is charged by the voltage decision that detects described battery supply, if described battery supply electric weight deficiency, then described control and treatment circuit is opened described field effect transistor, described voltage stabilization and current stabilization circuit charges to described battery supply, and after described battery supply charging finished, described control and treatment circuit was closed described field effect transistor.
8, the device of power supply switching according to claim 7 and battery protection is characterized in that, detects the voltage of described battery supply by comparator or analog/digital converter.
9, the device of power supply switching according to claim 7 and battery protection, it is characterized in that, when described external power supply was working properly, described resistance was pulled to high level with the grid of described field effect transistor, and described control and treatment circuit is closed described field effect transistor; When described external power supply disconnected, described resistance was pulled down to low level with the grid of described field effect transistor, and described control and treatment circuit is opened described field effect transistor.
10, according to the device of claim 7,8 or 9 described power supplies switchings and battery protection, it is characterized in that described field effect transistor is the P-channel metal-oxide-semiconductor field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100867493A CN100486076C (en) | 2005-11-01 | 2005-11-01 | Method and device for switching supply power and protecting batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100867493A CN100486076C (en) | 2005-11-01 | 2005-11-01 | Method and device for switching supply power and protecting batteries |
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| Publication Number | Publication Date |
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| CN1960110A CN1960110A (en) | 2007-05-09 |
| CN100486076C true CN100486076C (en) | 2009-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100867493A Expired - Fee Related CN100486076C (en) | 2005-11-01 | 2005-11-01 | Method and device for switching supply power and protecting batteries |
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| CN (1) | CN100486076C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011029334A1 (en) * | 2009-09-10 | 2011-03-17 | 惠州Tcl移动通信有限公司 | Power supply unit for mobile terminal and power supply switching method for mobile terminal |
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| CN102082460B (en) * | 2009-12-01 | 2015-04-29 | 研祥智能科技股份有限公司 | CPCI (compact peripheral component interconnect) power unit and system |
| CN102468684A (en) * | 2010-11-11 | 2012-05-23 | 三星半导体(中国)研究开发有限公司 | Switching control circuit for switching power supply between universal serial bus (USB) power source and battery |
| CN102075004B (en) | 2011-01-17 | 2013-05-08 | 中兴通讯股份有限公司 | Battery protection device and method of direct-current (DC) power supply |
| JP5081326B1 (en) * | 2011-04-27 | 2012-11-28 | シャープ株式会社 | CHARGE CONTROL DEVICE, TELEVISION RECEIVER, AND CHARGE CONTROL METHOD |
| CN102694414B (en) * | 2012-06-05 | 2015-03-11 | 哈尔滨工程大学 | Gapless automatic switching device for intelligent dual direct-current power supply |
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| CN104881936B (en) * | 2015-06-23 | 2017-10-10 | 新石器龙码（北京）科技有限公司 | A kind of express delivery terminal and power supply management method |
| CN105553049B (en) * | 2016-02-25 | 2018-05-29 | 广东欧珀移动通信有限公司 | Charging operations control method and device |
| CN105896654A (en) * | 2016-04-18 | 2016-08-24 | 乐视控股（北京）有限公司 | Battery charging management method and circuit |
| CN106532912B (en) * | 2016-11-16 | 2019-01-25 | 上海华虹集成电路有限责任公司 | The dynamic power supplies path selecting circuit of USB and battery dual power supply |
| CN107046317A (en) * | 2017-05-31 | 2017-08-15 | 无锡华润矽科微电子有限公司 | The management of charging and discharging system of battery |
| CN110416643B (en) * | 2019-07-31 | 2021-06-15 | 联想(北京)有限公司 | Processing method and device and electronic equipment |
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2005
- 2005-11-01 CN CNB2005100867493A patent/CN100486076C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011029334A1 (en) * | 2009-09-10 | 2011-03-17 | 惠州Tcl移动通信有限公司 | Power supply unit for mobile terminal and power supply switching method for mobile terminal |
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| CN1960110A (en) | 2007-05-09 |
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