CN100416978C - Charging controlling means realizing battery precharge without sampling and system thereof - Google Patents
Charging controlling means realizing battery precharge without sampling and system thereof Download PDFInfo
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- CN100416978C CN100416978C CNB2005101365850A CN200510136585A CN100416978C CN 100416978 C CN100416978 C CN 100416978C CN B2005101365850 A CNB2005101365850 A CN B2005101365850A CN 200510136585 A CN200510136585 A CN 200510136585A CN 100416978 C CN100416978 C CN 100416978C
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- 238000005070 sampling Methods 0.000 title abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 69
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
A charge control method achieves battery pre-charging without sampling, which is used in the system that the rechargeable power supply and the system work power supply share the same power supply, and the system work power supply connects with the battery output through a charge control switch, including the steps: (a) when the system detects that the charger is inserted, it automatically power-on resets and starts work, at this time the charging switch circuit disconnected, the battery output disconnected with the system work power supply; (b) during the system initialization, it closes/opens the said charging switch circuit, to conduct the charging loop circuit for charging the battery; (c) if the battery voltage below the system normal working voltage at this time, the system powers off and shuts down, and stepping into (a); if the battery voltage reaches the system normal working voltage, stepping into (d); (d) the battery pre-charging process is completed, entering the normal charging process. The method of the invention can achieve the safe and reliable control of the battery charging process, and control process is simple, and device cost is low.
Description
Technical field
The present invention relates to a kind of control method of battery charge.Be a kind of control method and the system thereof that finishes the back charging process at battery in over-discharge situation and charging specifically.
Background technology
Generally comprise following process at present in the charging control to battery: battery pre-charging process-quick charge process-constant voltage or pulse current charge process-charging finishes.The battery pre-charging process mainly is at battery over-discharge, does not export or exported low and can not reach the required minimum requirements of system works the time and the charging action of carrying out.The used power supply of charging control circuit and the main working power of system are same power supplys under a lot of situations, and the working power of system has direct dependence with battery output, thereby the working power of control circuit has just just had with the output voltage of battery and has contacted directly, these two power supply nodes can be same under the normal condition, and when at battery over-discharge and output or output are very not low, can be lower than the normal working voltage of system owing to the influence that working power is subjected to cell voltage, normally providing of charging control circuit working power is provided, thereby make system out of control, even cause system failure.Charging finishes the back influences battery useful life for avoiding long-time charging to battery, usually need be with battery output and charging control circuit disconnection after charging finishes.This just need carry out corresponding control at the charging process under battery over-discharge or damaged condition, increases control corresponding and protective circuit.After battery charge finishes, also want simultaneously and can control charging process.
Way commonly used in the present charging scheme of industry:
A, directly the output of system works power supply and battery is connected, the minimum voltage outage detection is set in system, avoid the overdischarge of battery as far as possible.
The circuit of this method and control are all fairly simple, but following shortcoming are arranged: at first, in case overdischarge appears in battery or make because damage and to be output as very low even to be zero, direct-connected method just may cause fatal harm to system.Secondly, if after charging finishes, continue to plug charger for a long time, can cause long-term charging, thereby influence the useful life of battery battery.
Directly separate between the power supply of B, battery output and charging control circuit with a protective circuit; this circuit can make the direct short circuit of itself and system's main power source (being the charging control circuit power supply) by the control of switch under the normal condition, and the output by charging control circuit directly charges the battery.Be lower than certain value when detecting cell output voltage, in the time of may having influence on system's operate as normal, the switching device in this protective circuit disconnects, and charges the battery with little electric current by current limliting and booster circuit (trickle charging circuit).
This scheme both can guarantee the operate as normal of system under the low excessively situation of cell voltage, had also guaranteed charging normal of battery, and the switching device after cell voltage rises to normal range (NR) very soon in the closed circuit begins the quick charge process to battery.Both be under extreme case, cell voltage cross low or and ground short circuit, can not damage system yet.The influence that also can avoid simultaneously the long-time charging to battery to cause.
But, in this scheme since battery supply and system works power supply in circuit, directly be not connected, and system needs to grasp in real time the actual conditions of system works power supply and cell output voltage, thereby take control corresponding according to actual conditions, relative first kind of scheme is with regard to many voltage samples and decision circuitry, because it is relatively harsher that lithium ion battery requires charging voltage, overcharged voltage can not be greater than 1% of cell voltage, so just the battery voltage sampling circuit has been had high requirement, control procedure also needs to increase corresponding conversion, judgement and control.Both increase system cost, also increased the complexity of control circuit and control procedure, reduced the reliability and the precision of control procedure, thereby increased the fault probability of system, increased research and development, test and maintenance cost.
In sum; need a kind of circuit and method that realizes battery charge control, can guarantee the control fully and the safeguard protection of charging process, guarantee the precision and the reliability of control; can not increase cost and system complexity again, the maintainability and the function that do not influence system simultaneously again realize.
Summary of the invention
The technical problem to be solved in the present invention provide a kind of need not to sample can realize the charge control method of battery pre-charging, can realize safe, the reliable control of battery charging process, and control procedure is simple, cost is low.The present invention also will provide a kind of device of realizing this method.
In order to solve the problems of the technologies described above, the invention provides a kind of need not to sample can realize the charge control method of battery pre-charging, be applied to power supply of charge power supply and system works power sharing, and the system that is connected by a charge switch circuit between the output of system works power supply and battery, this method may further comprise the steps:
The a system detects charger when having plugged, and electrification reset is also started working automatically, and this moment, charge switch circuit disconnected, and battery output disconnects with the system works power supply;
During the b system initialization,,, charge the battery the charge circuit conducting with described charge switch circuit closure;
If c cell voltage this moment is lower than system's normal working voltage, system's power down shutdown changes step a over to; If cell voltage has reached system's normal working voltage, change steps d over to;
The pre-charge process of d battery is finished, and enters the process of charging normal.
Further, above-mentioned charge control method also can have following characteristics: in the described steps d, when system according to actual detected to system works voltage when judging that battery has been full of, disconnect described charge switch circuit, prevent to overcharge or charging repeatedly.
Further, above-mentioned charge control method also can have following characteristics: among the described step c, and when cell voltage is lower than system's normal working voltage, system's power down because of the hardware self character, because device speed and circuit action of inertia, battery has obtained certain energy before power down.
The charge control system that can realize battery pre-charging of need not to sample provided by the invention comprise charge power supply interface, charging circuit, charging and electric power management circuit, main operating circuit and be used to disconnect or closed battery and charging circuit between the charge switch circuit that connects, wherein:
The output of described charging circuit is simultaneously as the signal of system's main power source and charge power supply, and described charging circuit is connected respectively to described charging and electric power management circuit, charge switch circuit;
Described main operating circuit is in initialized process, and output switch control signal makes its closure to described charge switch circuit;
Described charge switch circuit is having under the situation of charger, and the state after the power down is for disconnecting.
Further, above-mentioned charge control system also can have following characteristics: described charging and electric power management circuit are used to the power management of the system that realizes, comprise that whether detect the charge power supply interface plugs charger, is converted to the system works power supply with main power source, to the system works voltage sample; Simultaneously, be responsible for the real-time monitoring and the state of charging process and judge, output a control signal to described charging circuit, be lower than normal working voltage, charging and the electric power management circuit meeting automatic power down of system at cell voltage.
Further, above-mentioned charge control system also can have following characteristics: described charging circuit receives the power supply signal of charge power supply interface output, export the signal of while to charging and electric power management circuit as the charge power supply of main power source and battery, receive the control signal of described charging and electric power management circuit simultaneously, finish control procedure battery charge by state variation.
As from the foregoing, the inventive method and system have compared following advantage with other like product:
A, circuit are simple.It is just passable only need to increase the switching circuit that can control break-make between battery and working power, need not particular device.One group of sample circuit of cell voltage and system works power sharing.
B, circuit cost are low.Control circuit is simple, and the shared one group of sample circuit of operating voltage and battery voltage sampling has reduced the material cost of circuit.
C, control procedure realize simple, reliable.Only needing as required switching circuit to be carried out switch control can realize.System works voltage has reduced the test link with shared one of battery voltage sampling circuit, has simplified control flow.Improved control reliability.
System of the present invention can be used for the terminal of various directly-chargeables such as mobile phone, digital camera.
Description of drawings
Fig. 1 is the circuit structure block diagram of the embodiment of the invention.
Fig. 2 is embodiment of the invention method and control procedure.
Embodiment
The present invention adds the isolating switch device between battery and main power source input, realize that by the break-make of controlling this device protection and the charging to system finishes the protection of back to battery under the over-discharge situation.
Fig. 1 shows the circuit structure block diagram of embodiment of the invention system.Comprise:
Charge power supply interface 101 is connected with charger or other power supplys, feed system work and the required power supply of charging.
Charging and electric power management circuit 103 are used to the power management of the system that realizes, whether plug charger as detecting the charge power supply interface, and main power source is converted to the system works power supply, to the system works voltage sample etc.Simultaneously, be responsible for the real-time monitoring and the state of charging process and judge, output a control signal to charging circuit 102.If cell voltage is lower than the normal working voltage of system, charging and electric power management circuit can automatic power downs.
Battery 106 is the final service object of the present invention.
Compare with mentioning option A in the background technology, the present invention has increased a charge switch circuit in battery and charging circuit, and has increased in the control of initialization procedure to this switching device conducting in main operating circuit system.Except that pre-charge process, the control of other charging process is identical with this scheme.
Based on said system, Fig. 2 provides the control flow chart of present embodiment method, may further comprise the steps:
In this process, after charging and electric power management circuit 103 detect the existence of charger, the output of control charging circuit 102 is given the power supply of the power management main power source on charging and the electric power management circuit 103 at normal input range, and this circuit 103 is converted to the various system power supplies that system needs with the power management main power source.Main operating circuit 105 is meeting electrification reset after the power supply that needs is provided for it, start working then, and this moment, charge switch circuit 104 was in off-state, 106 on charging circuit 104 and battery are in the partition state, not beginning to battery 106 charging, at this moment both had been that battery 106 brownouts can not cause system's main power voltage to cross low and shut down yet.Cell voltage is not sampled when powering on yet and judge.
In this process, main operating circuit 105 powers on when carrying out initialization, and with charge switch circuit 104 closures, the charge power supply 101 that charger is provided is charged by 102 pairs of batteries of charging circuit 106.
If battery is in over-discharge state, after charge switch circuit 104 closures, system's main power source meeting is because cell voltage is crossed low and dragged down, and charging and electric power management circuit are owing to brownout meeting power down at this moment, and protection system is avoided damage.But because device speed and circuit action of inertia, battery has obtained certain energy before system's power down.The start because the existence of charger can power on again automatically, the action above repeating.
Because battery capacity under low voltage condition is very little; almost can not remember; so it is very little to be charged to the used charge volume of the voltage that can guarantee system's operate as normal from low-voltage; and used battery all has the under-voltage protection circuit basically at present; protection automatically when cell voltage is lower than certain safe voltage; disconnect to outside power supply, the voltage when waking back output voltage meeting directly from disconnection once more up begins output.So the charging the battery repeatedly of the cyclic process by front powering on repeatedly, charging, power down, the battery of overdischarge can reach the operating voltage that system needs by very fast realization preliminary filling, has substituted trickle charging circuit, has realized the function that trickle charge is same.
From above-mentioned flow process as can be seen, in this process, after plugging the charger start, need just when initialization, the charge switch circuit closure being charged the battery of control to get final product, do not need in advance to cell voltage detect judge charging the state that should locate, and cell voltage to cross when low be to finish pre-charge process to battery by power down, Auto Power On, precharge that the hardware self character causes, thereby simplified hardware circuit and control procedure.In sum, the precharge method and apparatus implement device of rechargable battery proposed by the invention is simple, with low cost, and control method is simple and reliable.Can realize the pre-charge process of the overdischarge of battery has been compared tangible advanced part and advantage with homogeneous system with minimum cost and the simplest control method.
Claims (6)
1. one kind need not to sample and can realize the charge control method of battery pre-charging, be applied to power supply of charge power supply and system works power sharing, and the system that is connected by a charge switch circuit between the output of system works power supply and battery, this method may further comprise the steps:
The a system detects charger when having plugged, and electrification reset is also started working automatically, and this moment, charge switch circuit disconnected, and battery output disconnects with the system works power supply;
During the b system initialization,,, charge the battery the charge circuit conducting with described charge switch circuit closure;
If c cell voltage this moment is lower than system's normal working voltage, system's power down shutdown changes step a over to; If cell voltage has reached system's normal working voltage, change steps d over to;
The pre-charge process of d battery is finished, and enters the process of charging normal.
2. charge control method as claimed in claim 1 is characterized in that, in the described steps d, when system according to actual detected to system works voltage when judging that battery has been full of, disconnect described charge switch circuit, prevent to overcharge or charging repeatedly.
3. charge control method as claimed in claim 1 is characterized in that, among the described step c, when cell voltage is lower than system's normal working voltage, system's power down because of the hardware self character, because device speed and circuit action of inertia, battery has obtained certain energy before power down.
4. one kind need not to sample and can realize the charge control system of battery pre-charging, comprise charge power supply interface, charging circuit, charging and electric power management circuit and main operating circuit, it is characterized in that, also comprise one be used to disconnect or closed battery and charging circuit between the charge switch circuit that connects, wherein:
The output of described charging circuit is simultaneously as the signal of system's main power source and charge power supply, and described charging circuit is connected respectively to described charging and electric power management circuit, charge switch circuit;
Described main operating circuit is in initialized process, and output switch control signal makes its closure to described charge switch circuit;
Described charge switch circuit is having under the situation of charger, and the state after the power down is for disconnecting.
5. charge control system as claimed in claim 4, it is characterized in that described charging and electric power management circuit are used to the power management of the system that realizes, comprise whether detect the charge power supply interface plugs charger, main power source is converted to the system works power supply, to the system works voltage sample; Simultaneously, be responsible for the real-time monitoring and the state of charging process and judge, output a control signal to described charging circuit, be lower than normal working voltage, charging and the electric power management circuit meeting automatic power down of system at cell voltage.
6. charge control system as claimed in claim 4, it is characterized in that, described charging circuit receives the power supply signal of charge power supply interface output, export the signal of while to charging and electric power management circuit as the charge power supply of main power source and battery, receive the control signal of described charging and electric power management circuit simultaneously, finish control procedure battery charge by state variation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101365850A CN100416978C (en) | 2005-12-30 | 2005-12-30 | Charging controlling means realizing battery precharge without sampling and system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101365850A CN100416978C (en) | 2005-12-30 | 2005-12-30 | Charging controlling means realizing battery precharge without sampling and system thereof |
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| CN1992466A CN1992466A (en) | 2007-07-04 |
| CN100416978C true CN100416978C (en) | 2008-09-03 |
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| CNB2005101365850A Expired - Fee Related CN100416978C (en) | 2005-12-30 | 2005-12-30 | Charging controlling means realizing battery precharge without sampling and system thereof |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814747B (en) * | 2009-02-19 | 2014-05-07 | 深圳迈瑞生物医疗电子股份有限公司 | Charging circuit and charging method |
| CN101510699B (en) * | 2009-04-08 | 2013-01-23 | 华硕电脑股份有限公司 | Electronic device and power supply charge system thereof |
| TWI436548B (en) | 2011-08-17 | 2014-05-01 | Rdc Semiconductor Co Ltd | Method and apparatus for indicating battery status applied to electronic device |
| CN103794831B (en) * | 2014-02-19 | 2016-07-20 | 中达电通股份有限公司 | A kind of method for charging batteries and system |
| CN104852418B (en) * | 2014-12-19 | 2017-12-08 | 北汽福田汽车股份有限公司 | It is a kind of to prevent from crossing the method and system put when battery charges |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2033555U (en) * | 1988-06-04 | 1989-03-01 | 北京海淀区玉渊潭华玉电子技术公司 | Accumulator overdischarge memory and equalizing charge unit |
| US5864221A (en) * | 1997-07-29 | 1999-01-26 | Trw Inc. | Dedicated avionics standby power supply |
| CN2520604Y (en) * | 2001-06-09 | 2002-11-13 | 周忠正 | Uninterruption power source |
| JP2003180003A (en) * | 2001-12-07 | 2003-06-27 | Honda Motor Co Ltd | Electric vehicle control device |
| US20050212484A1 (en) * | 2004-03-25 | 2005-09-29 | Denning Bruce S | Circuits capable of trickle precharge and/or trickle discharge |
-
2005
- 2005-12-30 CN CNB2005101365850A patent/CN100416978C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2033555U (en) * | 1988-06-04 | 1989-03-01 | 北京海淀区玉渊潭华玉电子技术公司 | Accumulator overdischarge memory and equalizing charge unit |
| US5864221A (en) * | 1997-07-29 | 1999-01-26 | Trw Inc. | Dedicated avionics standby power supply |
| CN2520604Y (en) * | 2001-06-09 | 2002-11-13 | 周忠正 | Uninterruption power source |
| JP2003180003A (en) * | 2001-12-07 | 2003-06-27 | Honda Motor Co Ltd | Electric vehicle control device |
| US20050212484A1 (en) * | 2004-03-25 | 2005-09-29 | Denning Bruce S | Circuits capable of trickle precharge and/or trickle discharge |
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| CN1992466A (en) | 2007-07-04 |
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