CN1118916C - Charge control device and method - Google Patents
Charge control device and method Download PDFInfo
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- CN1118916C CN1118916C CN99121599A CN99121599A CN1118916C CN 1118916 C CN1118916 C CN 1118916C CN 99121599 A CN99121599 A CN 99121599A CN 99121599 A CN99121599 A CN 99121599A CN 1118916 C CN1118916 C CN 1118916C
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- rechargeable battery
- resistance
- temperature
- charge
- thermistor
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a charge control device and a method thereof. The device is used for adjusting a charge current along with the temperature of a rechargeable battery. The charge control device comprises a temperature sensing element, such as a thermistor. The thermistor is arranged around the rechargeable battery for sensing the working temperature of the rechargeable battery. After the resistance value change of the thermistor is converted to a corresponding control signal by using a voltage converting circuit, the charge current output to the rechargeable battery by a power supply is regulated according to the control signal by using a charge current regulating circuit. Namely that when the battery temperature rises, the charge control device can be used for decreasing the charge current so that the temperature decreases. Thus, negative effects produced by the excessive high temperature can be prevented, and charge action does not need to be completely stopped simultaneously.
Description
The present invention relates to a kind of battery charge controller and control method, particularly at the rechargeable battery that is applied in the electronic installation (for example mobile computer or the like), can be according to the working temperature of rechargeable battery, the size of actual charge current is adjusted on mobility ground, uses the bad result that temperature overheating caused when preventing to charge and prevents overheated and the situation that stops to charge of having to.
General notes type (notebook) computer and various portable computer equipment mostly are to adopt the main source of battery as power supply, the requirement of portable to meet (protable) characteristic.Battery is because the restriction of volume mostly has certain effective power-on time, but for the user of this kind equipment of long period of operation, limited power-on time has just limited the operational degree of freedom of user.Therefore, for portable product, prolonging power-on time is very important problem.
The method that prolongs power-on time at present mainly is to utilize rechargeable battery to realize.For instance, the normal battery types that uses mostly is so-called secondary cell in the general mobile computer, and the battery that just has chargeable characteristic is as Ni-MH battery or the like.So fall Hou when these rechargeable battery power consumption, must utilize DC power supply (generally obtaining through conversion Hou) to charge by civil power, can reuse.
In general charging process, temperature is considerable environmental parameter.Too high when the temperature of charging process, not only can have influence on the quality of charging, also be easy to shorten the life-span of battery.When generally charging, rechargeable battery itself promptly can produce the heat of certain degree, and causes the rising of its ambient temperature.If place portable electron device (as mobile computer) to charge rechargeable battery, it is more obvious that temperature effect can become, because the heat that machine itself is produced can further encourage the rising of temperature.
The processing mode of existing charging circuit is the working temperature according to rechargeable battery, determines whether continuing charging.That is to say that when the working temperature of rechargeable battery surpasses one both during fixed temperature, charging circuit just cuts off power supply, stops the charging to rechargeable battery, uses to prevent the overheated negative effect that causes.Yet the shortcoming of prior art just is on this power down process.When charging in rechargeable battery is electronic installation (as mobile computer) under an open state, working temperature can often be in the state of high temperature.So charging process seems intermittently, has prolonged the actual charging interval to rechargeable battery.
In view of this, main purpose of the present invention is to provide a kind of battery charge controller and control method, can detect the variations in temperature of rechargeable battery at any time, and the charging current that adjustment is accordingly supplied, do not need to stop charging, so not only can prevent the negative effect that high temperature caused in the charging process, also can accelerate actual speed of charging simultaneously.
According to above-mentioned purpose, the present invention proposes a kind of battery charge controller, in order to control a power supply one rechargeable battery is charged, and this battery charge controller comprises:
One temperature sensitive member places near this rechargeable battery, and one of this temperature sensitive member characteristic value changes corresponding to the temperature of this rechargeable battery;
One voltage conversion circuit is coupled to this temperature sensitive member, and its characteristic value according to this temperature sensitive member changes, and produces corresponding to this rechargeable battery temperature controlling signal; And
One charging current is adjusted circuit, place this power supply for the charge path of this rechargeable battery and couple this voltage conversion circuit, it adjusts the charging current that this power supply is exported this rechargeable battery according to this control signal, and described charging current is adjusted circuit and comprised:
One pulse-width modulation circuit, it produces corresponding pulse-width signal according to this control signal, and the pulsewidth of this pulse-width signal is corresponding to the temperature of this rechargeable battery; And
One switch element is coupled to this pulse-width modulation circuit and places the charge path of this power supply for this rechargeable battery, and it adjusts the on off state of this charge path according to the pulsewidth of this pulse-width signal, uses the adjustment charging current.
According to a further aspect in the invention, provide a kind of charge control method, in order to control a power supply one rechargeable battery is charged, this charge control method comprises the following steps:
Utilize a temperature sensitive member, the temperature of this rechargeable battery of sensing in charging process, one of this temperature sensitive member characteristic value is corresponding to the temperature of this rechargeable battery;
The described characteristic value of changing this temperature sensitive member is a control signal;
Utilize this control signal, control the conducting state of this power supply, use the charging current size of adjusting this power supply output according to the temperature of this rechargeable battery the charge path of this rechargeable battery.
Disclosed battery charge controller and method mainly are when charging action, can decide the charging current size of actual output according to the temperature of rechargeable battery, the temperature of regulating rechargeable battery by this.So, can under the situation that does not stop charging process, charge with fast speeds, also avoid the negative effect that produces because of high temperature simultaneously.
For making above-mentioned and other purpose, characteristics and advantage perspicuousness more of the present invention,, and be described in detail below in conjunction with the accompanying drawings especially exemplified by a preferred embodiment:
Fig. 1 represents that the present invention is in order to adjust the detailed circuit diagram of the battery charge controller of charging current with the rechargeable battery temperature.
Fig. 2 represents the flow chart of charge control method of the present invention.
Element numbers explanation among the figure:
1～charging cell module; 1a～rechargeable battery; 2～PWM produces circuit; 3～5V voltage adjuster; R1～thermistor; R2-R9～resistance; D1, D2～diode; OP1～operational amplifier; C1～capacitor; V1～first dividing potential drop; V2～second dividing potential drop; V3～control voltage.
Fig. 1 represents that the present invention is in order to adjust the detailed circuit diagram of the battery charge controller of charging current with the rechargeable battery temperature.Among the figure, VIN represents external dc power, and for example electric main is delivered to the DC power supply of electronic installation through the processing of AC-DC transducer (ACadapter).Label 1 is represented charging cell module, has the rechargeable battery 1a of physical holding of the stock and supply electric power in it.External dc power VIN is by charging (power supply) circuit, the action that charging cell module 1 is charged.
As shown in the figure, capacitor C1, inductor L1 and elements such as diode D1, D2 place on the charge path, the radio-frequency component of removing power supply is provided and prevents function such as EMI interference.In addition, 3 voltages that convert external dc power VIN (being generally 12V) to 5V of 5V voltage regulator are used to provide the electric power of operational amplifier OP1 (Hou is stated) and the dividing voltage supply that conduct produces the first dividing potential drop V1 and the second dividing potential drop V2 (Hou is stated).In addition, resistor network (comprising resistance R 8, R9, R10, R11, R12) then is to be used for producing a reference voltage, and delivers to PWM generation circuit 2 (aftermentioned), provides the electric current of deciding of charging cell module 1 to feedback by this, just under the constant situation of condition, keep fixing charging current.
The battery charge controller of present embodiment, mainly constituted: thermistor R1 by following each element, voltage-regulating circuit (comprising resistance R 2, R3, R4, R5, R6 and operational amplifier OP1), PWM (pulse-width modulation) produces circuit 2, and switch element (comprising resistance R 7 and transistor Q1).
Thermistor R1 is as a temperature sensor, and the one end connects the negative terminal (being earth terminal) of external dc power VIN or rechargeable battery 1a, and places the inside of charging cell module 1, next-door neighbour's rechargeable battery 1a, the variations in temperature of responsible sensing rechargeable battery 1a.In the present embodiment, the resistance value of thermistor 1a can change along with the variations in temperature of rechargeable battery 1a, senses its variation of temperature by this.In addition, the present invention is except adopting thermistor, also can adopt other temperature sensor to monitor the variations in temperature of rechargeable battery 1a, its a certain characteristic value then can change along with temperature, changes the temperature of knowing rechargeable battery 1a this moment by inference by this characteristic value.
The resistance variations of thermistor R1 then is to utilize voltage conversion circuit (comprising resistance R 2～R6 and operational amplifier OP1) to be handled, and produces corresponding control signal (control voltage V3 comprise reference voltage that resistor network produces and by control signal that voltage conversion circuit produced).As shown in the figure, one of resistance R 2 terminates to the 5V voltage adjuster, and the other end then is coupled to thermistor R1, and therefore resistance R 2, thermistor R1 and the 5V voltage source of series connection promptly constitute potential-divider network, and, on both contacts, produce the first dividing potential drop V1 according to the resistance value ratio between two resistance.The first dividing potential drop V1 owing to can being subjected to Temperature Influence, the resistance value of thermistor R1 changes, so also can reflect this change value.On the other hand, resistance R 4 and R3 equally also constitute another potential-divider network.Wherein, an end of resistance R 4 and an end of resistance R 3 link together, and the other end of the other end of resistance R 4 and resistance R 3 is connected respectively to two outputs of 5V voltage adjuster 3.And, on both contacts, produce the second dividing potential drop V2 according to the resistance value ratio between two resistance.But, because the resistance value of resistance R 3 and R4 is fixed, therefore the second dividing potential drop V2 also is considered as a fixed reference.Then, the comparison circuit that utilizes resistance R 5, R6 and operational amplifier OP1 to be constituted compares the voltage difference of the first dividing potential drop V1 and the second dividing potential drop V2 and is amplified, and produces required control signal.This control signal can reflect the temperature change of rechargeable battery 1a equally.
Then, this control signal resistor network that is added to (on the reference voltage of R8～R12) produced, is delivered to PWM with the form of control voltage V3 and is produced circuit 2.And according to the change value of control signal (or control voltage V3) institute corresponding to variations in temperature, the pulse-width signal that PWM generation circuit 2 is produced can have the pulsewidth corresponding to this temperature change.Therefore, when this pulse-width signal is delivered to the base stage of transistor Q1, just can change conducting (turn-on) time of transistor Q1, just can change the size of charging current by this.In other words, when the ambient temperature of rechargeable battery 1a rose, the resistance value of thermistor R descended, and the charging current that causes external dc power VIN to be exported reduces, by this variation of compensation temperature rising.
In the present embodiment, thermistor R1 and voltage conversion circuit (comprise that operational amplifier OP1, resistance R 2～R6) also can be implemented by other battery temperature observation circuit, in addition, PWM produces circuit 2 and switch element (comprising transistor Q1 and resistance R 7) also can be implemented by other charging current adjustment circuit, and therefore circuit structure shown in Figure 1 is not in order to limit the present invention.
Fig. 2 promptly represents the flow chart of the charge control method of embodiment of the invention correspondence.As shown in the figure, at first, utilize thermistor or other temperature sensor, detect the temperature (S1) of rechargeable battery in charging process.At this moment, its resistance value or other characteristic of correspondence values can change with temperature change.Then, according to the change in resistance of thermistor, adjust the size (S2) of control voltage V3, the resistance value change of just changing this thermistor is control signal, produces control voltage V3 on the reference voltage that is added to.After the mode of actual converted can adopt the resistance value with thermistor to be converted to the first corresponding dividing potential drop, compare with fixing second dividing potential drop and amplify, use producing this control signal.Hou is utilized this control signal again, and the control power supply is for the conducting state of the charge path of rechargeable battery.Just according to the size of control voltage V3, PWM produces circuit 2 and produces the pwm signal (S4) with corresponding pulsewidth, utilizes this pwm signal again, and the conducting state of control charge path is adjusted charging current by this.Therefore, can flexibly adjust the charging current size of power supply output according to the temperature of rechargeable battery, and reach the purpose of regulating temperature.Owing to can not handle the situation of high temperature, so can accelerate the charging rate of rechargeable battery under the machine open state in the mode that stops to charge.
Though the present invention discloses as above with a preferred embodiment; but it is not in order to limit the present invention; those skilled in the art also can make many conversion and improvement, so protection scope of the present invention are limited by appended claims without departing from the spirit and scope of the present invention.
Claims (8)
1. a battery charge controller charges to a rechargeable battery in order to control a power supply, it is characterized in that comprising:
One temperature sensitive member places near this rechargeable battery, and one of this temperature sensitive member characteristic value changes corresponding to the temperature of this rechargeable battery;
One voltage conversion circuit is coupled to this temperature sensitive member, and its characteristic value according to this temperature sensitive member changes, and produces corresponding to this rechargeable battery temperature controlling signal; And
One charging current is adjusted circuit, place this power supply for the charge path of this rechargeable battery and couple this voltage conversion circuit, it adjusts the charging current that this power supply is exported this rechargeable battery according to this control signal, and described charging current is adjusted circuit and comprised:
One pulse-width modulation circuit, it produces corresponding pulse-width signal according to this control signal, and the pulsewidth of this pulse-width signal is corresponding to the temperature of this rechargeable battery; And
One switch element is coupled to this pulse-width modulation circuit and places the charge path of this power supply for this rechargeable battery, and it adjusts the on off state of this charge path according to the pulsewidth of this pulse-width signal, uses the adjustment charging current.
2. battery charge controller as claimed in claim 1 is characterized in that, this switch element is a transistor, and its base stage receives this pulse-width signal, and its collector and emitter is coupled to this rechargeable battery and this power supply respectively.
3. battery charge controller as claimed in claim 1 is characterized in that, this temperature sensitive member is a thermistor.
4. battery charge controller as claimed in claim 3 is characterized in that, this voltage conversion circuit comprises:
The resistance (R2) that is connected in series with this thermistor;
Resistance that is connected in series (R3) and resistance (R4), wherein, an end of resistance (R2) links to each other with described thermistor, and the other end of resistance (R2) does not interconnect with the end that resistance (R3) links to each other with resistance (R4);
One dividing voltage supply, be respectively coupled to the end that resistance (R2) and interconnective contact of resistance (R4) and resistance (R3) do not link to each other with resistance (R4), and on resistance (R2) and contact that thermistor is connected, produce first dividing potential drop, and on resistance (R3) and contact that resistance (R4) is connected generation second dividing potential drop; And
One comparison circuit, be connected respectively on resistance (R2) and the contact that thermistor is connected and resistance (R3) and contact that resistance (R4) is connected on, to receive this first dividing potential drop and second dividing potential drop respectively, also amplify in order to the difference that compares both by a set gain, produce this control signal.
5. a charge control method charges to a rechargeable battery in order to control a power supply, it is characterized in that comprising the following steps:
Utilize a temperature sensitive member, the temperature of this rechargeable battery of sensing in charging process, one of this temperature sensitive member characteristic value is corresponding to the temperature of this rechargeable battery;
The described characteristic value of changing this temperature sensitive member is a control signal;
Utilize this control signal, control the conducting state of this power supply, use the charging current size of adjusting this power supply output according to the temperature of this rechargeable battery the charge path of this rechargeable battery.
6. charge control method as claimed in claim 5 is characterized in that, this temperature sensor is a thermistor.
7. charge control method as claimed in claim 5 is characterized in that, comprises in the step of this control signal of conversion:
The characteristic value of this temperature sensitive member is converted to the first corresponding magnitude of voltage; And
Relatively this first magnitude of voltage and set second magnitude of voltage and amplification produce this control signal.
8. charge control method as claimed in claim 5 is characterized in that, comprises in the step of the conducting state of controlling this charge path:
According to this control signal, produce the pulse-width signal that has corresponding to the pulsewidth of this control signal; And
Utilize this pulse-width signal, switching places one of this charge path switch element, uses the conducting state of this charge path of control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99121599A CN1118916C (en) | 1999-10-18 | 1999-10-18 | Charge control device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99121599A CN1118916C (en) | 1999-10-18 | 1999-10-18 | Charge control device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1293479A CN1293479A (en) | 2001-05-02 |
| CN1118916C true CN1118916C (en) | 2003-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99121599A Expired - Fee Related CN1118916C (en) | 1999-10-18 | 1999-10-18 | Charge control device and method |
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| Country | Link |
|---|---|
| CN (1) | CN1118916C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013107303A1 (en) * | 2012-01-16 | 2013-07-25 | 华为终端有限公司 | Charging circuit and charger |
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| CN1301566C (en) * | 2003-08-08 | 2007-02-21 | 北京有色金属研究总院 | Secondary cell temperature controlled charging method |
| JP2006318682A (en) * | 2005-05-10 | 2006-11-24 | Makita Corp | Charger |
| CN101493759B (en) * | 2008-01-22 | 2011-12-21 | 安凯(广州)微电子技术有限公司 | Address control method of random capacity asynchronous first-in/first-out memory |
| CN101728841B (en) * | 2008-10-13 | 2015-03-25 | 三美电机株式会社 | Battery case |
| CN101752883B (en) * | 2008-12-04 | 2013-10-23 | 深圳迈瑞生物医疗电子股份有限公司 | Charging circuit, medical facility and charging method |
| CN103107564B (en) * | 2011-11-10 | 2015-10-14 | 亚旭电子科技(江苏)有限公司 | Charging current control method and charging system |
| CN103051027B (en) * | 2012-12-26 | 2015-04-22 | Tcl通讯（宁波）有限公司 | Mobile terminal and charging method and charging system for charging mobile terminal at different temperatures |
| FR3007210B1 (en) * | 2013-06-18 | 2016-09-30 | Renault Sa | SYSTEM AND METHOD FOR REGULATING THE TEMPERATURE OF AN ELECTROCHEMICAL BATTERY |
| CN103855772B (en) * | 2014-03-18 | 2016-12-14 | 努比亚技术有限公司 | Mobile terminal and charge control method thereof |
| CN106602616A (en) * | 2015-10-14 | 2017-04-26 | 深圳市中兴微电子技术有限公司 | Charging method and mobile terminal |
| CN105846527A (en) * | 2016-04-29 | 2016-08-10 | 上海与德通讯技术有限公司 | Power adapter, a charge unit, electronic device and assembly thereof and charge method |
| CN111446511B (en) * | 2019-01-17 | 2021-09-03 | 太普动力新能源(常熟)股份有限公司 | Battery and method for charging battery core |
| CN110103768A (en) * | 2019-04-23 | 2019-08-09 | 浙江合众新能源汽车有限公司 | A kind of electric car mends method for electrically and device automatically |
| CN113270653A (en) * | 2020-02-14 | 2021-08-17 | 太普动力新能源(常熟)股份有限公司 | Method for charging battery core of battery |
| CN111431236A (en) * | 2020-04-10 | 2020-07-17 | 珠海迈巨微电子有限责任公司 | Battery management chip and battery management system |
| JP7449787B2 (en) * | 2020-06-18 | 2024-03-14 | Fdk株式会社 | Secondary battery charging device |
-
1999
- 1999-10-18 CN CN99121599A patent/CN1118916C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013107303A1 (en) * | 2012-01-16 | 2013-07-25 | 华为终端有限公司 | Charging circuit and charger |
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| Publication number | Publication date |
|---|---|
| CN1293479A (en) | 2001-05-02 |
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