GB2459092A - Temperature control of a rechargeable portable electronic device - Google Patents

Temperature control of a rechargeable portable electronic device Download PDF

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Publication number
GB2459092A
GB2459092A GB0806296A GB0806296A GB2459092A GB 2459092 A GB2459092 A GB 2459092A GB 0806296 A GB0806296 A GB 0806296A GB 0806296 A GB0806296 A GB 0806296A GB 2459092 A GB2459092 A GB 2459092A
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GB
United Kingdom
Prior art keywords
charging
unit
current
temperature
rechargeable battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0806296A
Other versions
GB0806296D0 (en
GB2459092B (en
Inventor
Chun-Chen Chao
Ming-Hui Lin
Ching-Sung Chang
Yuan-Heng Huang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Twinhead International Corp
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Twinhead International Corp
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Priority to GB0806296A priority Critical patent/GB2459092B/en
Publication of GB0806296D0 publication Critical patent/GB0806296D0/en
Publication of GB2459092A publication Critical patent/GB2459092A/en
Application granted granted Critical
Publication of GB2459092B publication Critical patent/GB2459092B/en
Active legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • H02J7/047—

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A portable electronic device, such as a notebook computer, PDA, tablet PC or a UMPC, includes a charging unit (22) coupled to a rechargeable battery unit (21), an internal electronic unit (24), and a temperature sensor (231) for sensing the temperature of the internal electronic unit (24). The charging unit (22) receives an external input power and outputs a charging current (Icharging) for charging the rechargeable battery unit (21), and a supply current (Isupply) supplied to the internal electronic unit (24), and adjusts the charging current (Icharging ) outputted to the rechargeable battery unit (21) based on the temperature of the internal electronic unit (24). A method of adjusting a charging current (Icharging) for a rechargeable battery unit (21) of a portable electronic device is also disclosed. This prevents user discomfort from raised temperature of the device and also prevents adverse influence on the reliablility of electronic components in the device. A second temperature sensor (232) may be used to additionally measure the temperature of the battery (21).

Description

PORTABLE ELECTRONIC DEVICE AND METHOD OF ADJUSTING
CHARGING CURRENT FORA RECHARGEABLE BATTERY UNIT THEREOF
The invention relates to aportableelectronicdevice, more particularly to a portable electronic device and method of adjusting charging current for a rechargeable battery unit thereof.
Referring to Figure 1, a conventional notebook computer is shown to include a rechargeable battery unit ill, a temperature sensor 112 for sensing temperature of the rechargeable battery unit 111, and a charging unit 12 coupled to the rechargeable battery unit 111 andthe temperature sensor 112, and receiving anexternal input power so as to output a fixed charging current for charging the rechargeable battery unit 111 until the charging unit 12 detects that the temperature of the rechargeable battery unit 111 is higher than a threshold temperature based on the output of the temperature sensor 112.
However, heat generated by the rechargeable battery unit ill during a charging period is conducted or radiated to other electronic components of the notebook computer that are activated, thereby resulting in adverse influence on reliabilities of the other electronic components. Meanwhile, a user feels uncomfortable as a result of raised temperature of the notebook computer.
Inaddition, inorderto improve charging efficiency, the charging current for charging the rechargeable battery unit 111 will be increased, thereby resulting in further rising of the temperature of the notebook computer. As a result, a heat-dissipating device is required for the conventional notebook computer, thereby increasing costs.
Therefore, the object of the present invention is to provide a portable electronic device and method of adjusting a charging current for a rechargeable battery unit thereof that can overcome the aforesaid drawbacks
of the prior art.
According to one aspect of the present invention, a portable electronic device comprises: a rechargeable battery unit; an internal electronic unit; a first temperature sensor for sensing temperature of the internal electronic unit; and a charging unit coupled to the rechargeable battery unit, the internal electronic unit and the first temperature sensor, and adapted to receive an external input power so as to output a charging current for charging the rechargeable battery unit, and a supply current supplied to the internal electronic unit.
The charging unit adjusts the charging current outputted to the rechargeable battery unit based on the temperature of the internal electronic unit as sensed by the first temperature sensor.
Accordingto another aspect of thepresent invention, there is provided a method of adjusting a charging current for a rechargeable battery unit of a portable electronic device. The portable electronic device includes an internal electronic unit. The method comprises the steps of: a) detecting temperature of the internal electronic unit; and b) adjusting the charging current based on result of detection in step a) Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which: Figure 1 is a schematic circuit block diagram illustrating a conventional notebook computer; Figure 2 is a schematic circuit block diagram illustrating the preferred embodiment of a portable electronic device according to the present invention; and Figure 3 is a flow chart illustrating how the preferred embodiment adjusts a charging current for a rechargeable battery unit thereof.
Referring to Figure 2, the preferred embodiment of a portable electronic device according to the present invention is shown to include a rechargeable battery unit 21, an internal electronic unit 24, a first temperature sensor23l, asecondtemperaturesensor232, andachargingunit22. Inthisembodiment, theportable electronic device is a notebook computer. In other embodiments, the portable electronic device can be a PDA, a tablet PC or a UMPC.
In this embodiment, the internal electronic unit 24 has a conventional configuration that includes a North-bridgechipset24lcoupledwithaCPU243, amemory 244 andadisplay245, aSouth-bridgechipset242coupled with the North-bridge chipset 24l,a keyboard controller 247 and a hard disk 246, and a keyboard 248 coupled to the keyboard controller 247. As such, details of the conventional configuration thereof are omitted for the sake of brevity.
In this embodiment, the first temperature sensor 231 is coupled to the North-bridge chipset 241 of the internalelectronicunit24 forsensingtemperature (Ti) of the memory 244 of the internal electronic unit 24.
It is noted that the memory 244 has a duty frequency that is reduced from a predetermined frequency by the North-bridge chipset 241 upon detecting that the temperature (Ti) of the memory 244 as sensed by the first temperature sensor 231 is higher than a first threshold temperature (Tthdl) Thesecondtemperaturesensor232 sensestemperature (T2) of the rechargeable battery unit 21.
The charging unit 22 is coupled to the rechargeable
S
battery unit 21, the internal electronic unit 24, and the first and second temperature sensors 231, 232. The charging unit 22 is adapted to receive an external input power so as to output a charging current (charging) for charging the rechargeable battery unit 21, and a supply current (supply) suppliedtotheinternalelectronicunit 24. In this embodiment, the charging unit 22 adjusts the charging current (Icharging) outputted to the rechargeable battery unit 21 based on the temperatures of the memory 244 of the internal electronic unit 24 and the rechargeable battery unit 21 as sensed respectivelybythe first and secondtemperature sensors 231, 232, the supply current (Isupply) outputted to the internal electronic unit 24, and a current value of the charging current (charging) . The charging unit 22 is operable in one of a first charging mode, where the chargingcurrent (charging) outputtedto the rechargeable battery unit 21 substantially has a first predetermined current value, such as 2.5A, a second charging mode, where the charging current (charging) outputted to the rechargeable battery unit 21 substantially has a second predetermined current value less than the first predetermined current value, such as 0.5A, and a third charging mode, where the charging current (Icharging) outputted to the rechargeable battery unit 21 ranges from 0 to the first predetermined current value so that a total power consumption of the portable electronic device is not greater thanapredeterminedmaximurripower, such as 65W.
Referring to Table 1, there are provided conditions corresponding to the first to third charging modes of the charging unit 22.
Table 1
Isupply>Iref Ti>Tthdl T2>Tthd2 Icharging<O. 5A Charging ___________ ___________ ___________ _____________ mode NO NO NO don't care -first
-YES NO
NO NO YES don't care second
__________ YES YES ____________ __________
NO NO don't care third
YES NO
NO YES NO second
YES YES YES _____________ ___________
YES NO
NO YES YES third
___________ YES YES _____________ ___________
The following are detailed descriptions of the
conditions corresponding to the first to third charging modes of the charging unit 22.
The charging unit 22 is operated in the first charging mode upon detecting that the supply current (supply) outputted to the internal electronic unit 24 is not greater than a reference current (ret) and that the temperatures (Ti, T2) of the memory 244 and the rechargeable battery unit 21 sensed respectively by the first and second temperature sensors 231, 232 are not higher than the first threshold temperature (Tthdl) and a second threshold temperature (Tthd2) , respectively.
The charging unit 22 is operated in the second charging mode upon detecting that the supply current (Isuppiy) outputted to the internal electronic unit 24 is not greaterthanthe reference current (Iref) andthat at least one of the temperatures (Ti, T2) of the memory 244 and the rechargeable battery unit 21 is higher than a corresponding one of the first and second threshold temperatures (Tthdl, Tthd2) * ---Thechargingunit22isoperatedinthethirdcharging mode upon detectingthe supplycurrent outputted to the internal electronic unit 24 is greater than the reference current (Iref) and that the temperatures (Tl, T2) of the memory 244 and the rechargeable battery unit 21 sensed respectively by the first and second temperature sensors 231, 232 are not higher than the first and second threshold temperatures (Tthdl, Tthd2) respectively.
The charging unit 22 is also operated in the second charging mode upon detecting that the supply current (Isupply) outputted to the internal electronic unit 24 is greater than the reference current (Iref), that at least one of the temperatures (Ti, T2) of the memory 244 and the rechargeable battery unit 21 is higher than the corresponding one of the first and second threshold temperatures (Tthdl, Tthd2) , and that the current value of the charging current (charging) is not less than a
S
reference current value, such as 0.5 A. In this embodiment, the reference current value is equal to the second predetermined current value.
The charging unit 22 is also operated in the third charging mode upon detecting that the supply current (supply) outputted to the internal electronic unit 24 is greater than the reference current (Iref), that at least one of the temperatures (Ti, T2) of the memory 244 and the rechargeable battery unit 21 is higher than --the corresponding one of the first and second threshold temperatures (Tthdl, Tthd2), and that the current value of the charging current (charging) is less than the reference current value.
Referring to Figure 3, there is shown a flow chart to illustrate how the charging unit 22 adjusts the charging current (charging) according to the preferred embodiment.
In step Si, the first and second temperature sensors 231, 232 sense respectively the temperatures (Ti, T2) of the memory 244 and the rechargeable battery unit 21.
In step S2, the charging unit 22 detects whether the supply current (supply) outputted to the internal electronic unit 24 is greater than the reference current (Iref). Ifnegative, theflowgoestostepS3. Otherwise, the flow proceeds to step S6.
In step S3, the charging unit 22 detects whether the temperature (Ti) of the memory 244 as sensed by the first temperature sensor 231 is not greater than the first threshold temperature (Tthdl) while the temperature (T2) of the rechargeable battery unit 21 as sensed by the second temperature sensor 232 is not greater than the second threshold temperature (Tthd2) . If affirmative, the flow goes to step S4. Otherwise, the flow proceeds to step S5.
In step S4, the charging unit 22 is operated in the first charging mode.
In step S5, the charging unit 22 is operated in the second charging mode.
In step S6, similar to step S3, the charging unit 22 detects whether the temperature (Tl) of the memory 244 as sensed by the first temperature sensor 231 is * 15 not greater than the first threshold temperature (Tthdl) while the temperature (T2) of the rechargeable battery *.. * unit 21 as sensed by the second temperature sensor 232 :r' is not greater than the second threshold temperature ** (Tthd2). If affirmative, the flow goes to step S7.
Otherwise, the flow proceeds to step S8.
*:*. In step S7, the charging unit 22 is operated in the third charging mode.
In step S8, the charging unit 22 detects whether the current value of the charging current (Ichatging) is less than 0.5A, i.e., the reference current value. If affirmative, the flow goes back to step S7. Otherwise, the flow goes back to step S5.
In sum, once the temperature (Ti) of the memory 244 rises to the first threshold temperature (Tthdl), the charging current (charging) is reduced, thereby reducing influence on the memory 244 by the heat generated by the rechargeable battery unit 21. Furthermore, when the temperature (Ti) of the memory 244 is higher than the first threshold temperature (Tthdl), the duty frequency of the memory 244 is reduced, thereby mitigating rising of the temperature (Ti) of thememory 244. As a result, the reliability of the memory 244 can be assured without the need for an additional heat-dissipating device. * ** * * * * ** * *** * S * S.. S... S...
S * . S * S S. S * S S 55

Claims (21)

  1. CLAIMS: 1. A portable electronic device comprising: a rechargeable battery unit; an internal electronic unit; a first temperature sensor for sensing temperature of said internal electronic unit; and a charging unit coupled to said rechargeable battery unit, said internal electronic unit and said first temperature sensor, and adapted to receive an external input power so as to output a charging current for charging said rechargeable battery unit, and a supply current supplied to said internal electronic unit; wherein said charging unit adjusts the charging current outputted to said rechargeable battery unit * 15 based on the temperature of said internal electronic unit as sensed by said first temperature sensor. * ***
  2. 2. The portable electronic device as claimed in Claim *. 1, wherein said charging unit reduces the charging ** currentoutputtedtosaidrechargeablebatteryunitupon detecting that the temperature of said internal *:*. electronic unit is higher than a threshold temperature.
  3. 3. The portable electronic device as claimed in Claim 2, wherein said internal electronic unit includes a memory having a duty frequency that is reduced from a predetermined frequency when the temperature thereof is higher than the threshold temperature.
  4. 4. The portable electronic device as claimed in Claim 1, wherein said charging unit adjusts the charging current outputted to said rechargeable battery unit further based on the supply current outputted to said internal electronic unit.
  5. 5. The portable electronic device as claimed in Claim 4, further comprising a second temperature sensor coupled to said charging unit for sensing temperature of said rechargeable battery unit, wherein said charging unit adjusts the charging current outputted to said rechargeable battery unit further based on the temperature of said rechargeable batteryunitassensedbysaidsecondtemperaturesensor.
  6. 6. The portable electronic device as claimed in Claim 5, wherein said charging unit reduces the charging * 15 current outputtedto said rechargeablebatteryunit upon detecting that the supply current outputted to said internalelectronicunit isnotgreaterthanareference current and that at least one of the temperatures of S.... said internal electronic unit and said rechargeable battery unit is higher than a corresponding one of first and second threshold temperatures.
  7. 7. The portable electronic device as claimed in Claim 6, wherein said charging unit is operable in one of a first charging mode, where the charging current outputted to said rechargeable battery unit substantially has a first predetermined current value, a second charging mode, where the charging current outputted to said rechargeable battery unit substantially has a second predetermined current value less than the first predetermined current value, and a third charging mode, where the charging current outputted to said rechargeable battery unit ranges from o to the first predetermined current value so that a total power consumption of said portable electronic device is not greater than a predetermined maximum power.
  8. 8. The portable electronic device as claimed in Claim 7, wherein: said charging unit is operated in the first charging mode upon detecting that the supply current outputted to said internal electronic unit is not greater than the reference current and that the temperatures of said * 15 internal electronic unit and said rechargeable battery unit sensed respectively by said first and second **** temperature sensors are not higher than the first and *S..second threshold temperatures, respectively; ** said charging unit is operated in the second charging mode upon detecting that the supply current outputted to said internal electronic unit is not greater than the reference current and that at least one of the temperatures of said internal electronic unit and said rechargeable battery unit is higher than the corresponding one of the first and second threshold temperatures; and said charging unit is operated in the third charging mode upon detecting that the supply current outputted to said internal electronic unit is greater than the reference current and that the temperatures of said internal electronic unit and said rechargeable battery unit sensed respectively by said first and second temperature sensors are not higher than the first and second threshold temperatures, respectively.
  9. 9. The portable electronic device as claimed in Claim 7, wherein said charging unit adjusts the charging current outputted to said rechargeable battery unit further based on a current value thereof.
  10. 10. The portable electronic device as claimed in Claim 9, wherein: said charging unit is operated in the second charging * 15 mode upon detecting that the supply current outputted to said internal electronic unit is greater than the S...reference current, that the currentvalueof the charging current is not less than a reference current value, and S...that at least one of the temperatures of said internal electronic unit and said rechargeable battery unit sensed respectivelybysaid first and secondtemperature sensors is higher than the corresponding one of the first and second threshold temperatures; and said charging unit is operated in the third charging mode upon detecting that the supply current is greater than the reference current, that the current value of the charging current is less than the reference current value, and that at least one of the temperatures of said internal electronic unit and said rechargeable battery unit sensed respectively by said first and second temperature sensor is higher than the corresponding one of the first and second threshold temperatures.
  11. 11. The portable electronic device substantially as hereinbefore described with reference to and as illustrated in Figure 2 of the accompanying drawings.
  12. 12. A method of adjusting a charging current for a rechargeable battery unit of a portable electronic device, the portable electronic device including an internal electronic unit, said method comprising the steps of: a) detecting temperature of the internal electronic unit; and **:* b) adjusting the charging current based on result S... of detection in step a)
  13. 13. The method as claimed in Claim 12, wherein, in step b), the charging current is reduced when the temperature of the internal electronic unit as detected in step a) is higher than a threshold temperature.
  14. 14. ThemethodasclaimedinClaiml2, further comprising, prior to step b), a step of: a-i) detecting a supply current supplied to the internal electronic unit; wherein, instepb), the charging current is adjusted further based on result of detection in step a-i)
  15. 15. ThemethodasciaimedinClaiml4, furthercomprising, prior to step b) , a step of: a-2) detecting temperature of the rechargeable battery unit; wherein, instepb), the chargingcurrent isadjusted further based on result of detection in step a-2)
  16. 16. The method as claimed in Claim 15, wherein the charging current is reduced in step b) when the supply current detected in step a-i) is not greater than a reference current, and when at least one of the temperature of the internal electronic unit detected in step a) and the temperature of the rechargeable battery unit detected in step a-2) is higher than a corresponding one of first and second threshold * 15 temperatures.
  17. 17. The method as claimed in Claim 16, wherein, in step * *** b) , the charging current is adjusted to one of a first state, where the charging current substantially has a I...* first predetermined current value, a second state, where the charging current substantially has a second predetermined current value less than the first predetermined current value, and a third state, where the charging current ranges from 0 to the first predetermined current value so that a total power consumption of the portable electronic device is not greater than a predetermined maximum power.
  18. 18. The method as claimed in Claim 17, wherein, in step b) the charging current is adjusted to the first state when the supply current detected in step a-i) is not greater than the reference current, when the temperature of the internal electronic unit detected in step a) is not higher than the first threshold temperature, and when the temperature of the rechargeable battery unit detected in step a-2) is not higher than the second threshold temperature; the charging current is adjusted to the second state when the supply current detected in step a-i) is not greater than the reference current, and when at least one of the temperature of the internal electronic unit detected in step a) and the temperature of the * 15 rechargeablebatteryunitdetectedjnstepa_2) ishigher than the corresponding one of first and second threshold temperatures; and the charging current is adjusted to the third state when the supply current detected in step a-i) is greater than the reference current, when the temperature of the *:*. internal electronic unit detected in step a) is not higher than the first threshold temperature, and when the temperature of the rechargeable battery unit detected in step a-2) is not higher than the second threshold temperature.
  19. 19. The method as claimed in Claim 17, wherein, in step b), the charging current is adjusted further based on a current value thereof.
  20. 20. The method as claimed in Claim 19, wherein, in step b) the charging current is adjusted to the second state when the supply current detected in step a-i) is greater than the reference current, when the current value of the charging current is not less than a reference current value, and when at least one of the temperature of the internal electronic unit detected in step a) and the temperature of the rechargeable battery unit detected in step a-2) is higher than the corresponding one of the first and second threshold temperatures; and the charging current is adjusted to the third state when the supply current detected in step a-i) is greater than the reference current, when the current value of the charging current is less than the reference current 1*i* value, and when at least one of the temperature of the 1;, internal electronic unit detected in step a) and the S...temperature of the rechargeable battery unit detected in step a-2) is higher than the corresponding one of the first and second threshold temperatures.* .
  21. 21. The method substantially as hereinbefore described with reference to and as illustrated in Figure 3 of the accompanying drawings.
GB0806296A 2008-04-07 2008-04-07 Portable electronic device and method of adjusting charging current for a rechargeable batttery unit thereof Active GB2459092B (en)

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Application Number Priority Date Filing Date Title
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GB2459092A true GB2459092A (en) 2009-10-14
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8751710B2 (en) 2012-05-08 2014-06-10 Entegra Technologies, Inc. Reconfigurable modular computing device
CN103872732A (en) * 2014-03-14 2014-06-18 深圳市中兴移动通信有限公司 Mobile terminal and charging control method thereof
CN105591439A (en) * 2016-02-24 2016-05-18 努比亚技术有限公司 Mobile terminal charging state control device and mobile terminal charging state control method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001145274A (en) * 1999-11-15 2001-05-25 Matsushita Electric Ind Co Ltd Portable device including a charger
US20080054853A1 (en) * 2006-08-29 2008-03-06 Agere Systems, Inc. Software based thermal charging regulation loop

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001145274A (en) * 1999-11-15 2001-05-25 Matsushita Electric Ind Co Ltd Portable device including a charger
US20080054853A1 (en) * 2006-08-29 2008-03-06 Agere Systems, Inc. Software based thermal charging regulation loop

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8751710B2 (en) 2012-05-08 2014-06-10 Entegra Technologies, Inc. Reconfigurable modular computing device
US8924609B2 (en) 2012-05-08 2014-12-30 Entegra Technologies, Inc. Reconfigurable modular computing device
US9213664B2 (en) 2012-05-08 2015-12-15 Entegra Technologies, Inc. Reconfigurable modular computing device
CN103872732A (en) * 2014-03-14 2014-06-18 深圳市中兴移动通信有限公司 Mobile terminal and charging control method thereof
CN103872732B (en) * 2014-03-14 2018-04-20 努比亚技术有限公司 Mobile terminal and its charge control method
CN105591439A (en) * 2016-02-24 2016-05-18 努比亚技术有限公司 Mobile terminal charging state control device and mobile terminal charging state control method

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Publication number Publication date
GB0806296D0 (en) 2008-05-14
GB2459092B (en) 2010-07-07

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