AU661876B2 - Charging device for a portable telephone - Google Patents
Charging device for a portable telephone Download PDFInfo
- Publication number
- AU661876B2 AU661876B2 AU30194/92A AU3019492A AU661876B2 AU 661876 B2 AU661876 B2 AU 661876B2 AU 30194/92 A AU30194/92 A AU 30194/92A AU 3019492 A AU3019492 A AU 3019492A AU 661876 B2 AU661876 B2 AU 661876B2
- Authority
- AU
- Australia
- Prior art keywords
- power source
- charging
- telephone
- state
- portable telephone
- 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.)
- Ceased
Links
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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Mobile Radio Communication Systems (AREA)
Description
S F Ref: 223469
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT
ORIGINAL
Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: NEC Corporation 7-1, Shiba Minato-ku Tokyo
JAPAN
Hideo Namiki, Motoyoshl Komoda Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Charging Device for a Portable Telephone
J
The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5845/5 CHARGING DEVICE FOR A PORTABLE TELEPHONE BACKGROUND OF THE INVENTION The present invention relates to a charging device for a portable telephone and, more particularly, to a charging device capable of charging a portable telephone in the same period of time with no regard to the ON/OFF state of a power' source incorporated in the telephone.
A portable telephone extensively used today is powered by a battery or similar power source. When the power of the power source is consumed, the telephone is connected to a S 1 0 charging device to be charged thereby. The charging device usually has a telephone detecting section for detecting the telephone connected to the device, a charging current source for feeding a charging current to the telephone power source, and a switch for connecting the charging current source to the 1 5 telephone power source. When the telephone is connected to the charging device, the device detects the connection with the telephone detecting section and operates the switch to feed the :charging current from the charging current source to the telephone' power source. It is a common practice with the 2 0 coqnentional charging device to maintain the charging current "i constant at all times with no regard to the ON/OFF state of the telephone power source.
This, however, gives rise to the following problem. Assume that the telephone power source is fully charged in a period of time T 1 when in an OFF state or in a period of time T 2 when in an ON state. Then, when the telephone power source is in an ON state, the current actually charging the power source is smaller than the charging current being fed from the charging current source since part of the charging current is consumed as an operating current of the telephone. As a result, the period of time T2 is longer than the period of time T 1 ie., the charging time in the ON state is far longer than the charging time in the OFF state. This makes it impractical to charge the telephone when the power source thereof is held in an ON state.
SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a charging device capable of charging a portable telephone in the same period of time with no regard to the ON/OFF state of a power source accommodated in the telephone.
15 In an aspect of the invention, there is disclosed a charging device for charging S..a power source incorporated in a portable telephone, said device comprising: *fee.: a body to which the portable telephone is to be connected; oo. *a charging current source for feeding a charging current to the power source of the portable telephone; 20 telephone detecting means for determining whether or not the portable S.. telephone is connected to the body; C C .ON/OFF state sensing means for determining an ON/OFF state of the power source of the portable telephone; and IN\LIBCC!00283:MW current control means for controlling the charging current from the charging current source in response to the ON/OFF state of the power source of the portable telephone sensed by the ON/OFF state sensing means; the current control means controls the charging current source such that, when the power source requires charging, the charging current is greater when the power source of the portable telephone is in an ON state than when the power source is in an OFF state, the power source of the portable telephone thereby being fully charged in substantially the same period of time whether the power source is in an ON state or an OFF state.
BRIEF DESCRIPTICN OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken with the accompanying drawings in which: Fig. 1 is a block diagram schematically showing a conventional charging device for a portable telephone; SFig. 2 plots a relation between the charging current and the charging time particular to the conventional charging device with respect to an ON state and an OFF I state; Fig. 3 is a block diagram of a charging device embodying the present S: 20 invention; Fig. 4 is a graph similar to Fig. 2, showing a relation between the charging current and the charging time achievable with the embodiment; and Fig. 5 is a circuit diagram showing the embodiment more specifically.
:oooi INA\LIBCC10OO2B3:HRW -4- DESCRIPTION OF THE PREFERRED EMBODIMENT To better understand the present invention, a brief reference will be made to a conventional charging device for a portable telephone, shown in FIG. 1. As shown, a portable telephone 10 is loaded with a battery or similar power source and may be removably connected to a charging device The charging device 20 has a telephone detecting section 22 for detecting the telephone 10 when it.. is attached to the charging device 20, a switch 24 operated by the resulting output of the 1 0 detecting section 22, and a charging current source 26. On detecting the telephone 10, the detecting section 22 causes the switch 24 to close with the result that the charging current source 26 is connected to the power source lOa of the telephone 10. The conventional charging device 20 feeds a 1 5 constant charging current from the current source 26 thereof to the telephone 10 with no regard to the ON/OFF state of the telephone power source As shown in FIG. 2, assume that the charging current and the duration of charging are I and T, respectively. When the 2 0 telephone power source 10a is turned off, in an OFF state while charging is under way, it is fully charged at a time T 1 Ho: e H ver, when the power source 10a is in an ON state, part of .th' charging current is consumed as an operating current of the telephone 10, the power source 10a is charged by a current ,',smaller than the current actually fed from the charging unit As a result, a period of time T, (T 2
T
1 is needed for the power source 10a to be fully charged. For example, assume that when 11 is 40 milliamperes, T 1 is 10 hours, that the telephone consumes a current I 0 of 30 milliamperes in a waiting state, and that a charging current in the ON state of the power source is Then, there holds an equation: I2 I I I 40 30 10 (milliamperes) The charging time T, is expressed as: T, T 1 x I1/ I, 40 (hours) 1 0 Such a period of time T 2 is four times as long 'as the period of time T 1 and, therefore, not practical.
Referring to FIGS.A 51 a charging device embodying the present invention and free from the above problem will be described. In FIGS. 7 the same or similar constituents to the 5 constituents of FIGS. 1 and 2 are designated by like reference numerals, and redundant description will be avoided for simplicity.
As shown in FIG. 3, the charging device, generally 20A, has an ON/OFF state sensing section 28 and a current control 2 0 section 30 in addition to the constituents of the conventional shoWt on Scharging device 20 FIG. 1. The sensing section 28 determines 0 whether or not the power source 10a of the telephone 10 is in S, an *ON state. The current control section 30 is connected between the ON/OFF sensing section 28 and a charging current 2 5 :source 26. The current control section 30 changes the charging
~LV
current of the charging current source 26 in response to an output of the ON/OFF sensing section 28.
FIG. 4 shows a product of a charging current I and a charging time T which is a charge necessary for charging.
Assuming 11 40 milliamperes, T 1 10 hours, and T. hourn, then 1 1
(T
2
-T
1 1.2 ampere-hour is the charge being consumed in the telephone 10 during charging.
As shown in FIG. 4, when the telephone power source is in an OFF state, a charging current I1 is fed from the charging 1 0 device 20A to the telephone 10. In the illustrative embodiment, when the power source 10a is in an ON state, a charging current 12 I) is fed to the telephone 10 in order to compensate for the charge 1 1
(T
2
-T
1 being consumed during charging. When 1, is selected to be 160 milliamperes to satisfy an equation S 15 I(T 2 (I-I1 1
)T
1 the telephone 10 can be fully charged in Ii the same period of time with no regard to the ON/OFF state of 0 the power source 10a, as shown in FIG. 4.
SFIG. 5 shows the charging device 20A and telephone power source 10a more specifically. As shown, when a transistor TR6 20 constituting a telephone detecting section 22 is turned on by a signal BATT, it indicates that a battery Ba implementing the power source 10a is connected to the charging device Then, a transistor TR2 constituting a switch 24 is rendered conductive to connect a charging current source 26 to the power 2 5 source 10a. At the same time, the telephone 10 sends a signal t (p PSON to a transistor TR5 constituting the ON/OFF state sensing section indicating whether or not the power source 10a is in an ON state. As the output of the transistor TR5 is coupled to a transistor TR4 implementing the current control section 30, the control section 30 controls the charging current I to flow through a terminal V such that the charging current in the ON state of the power source 10 is greater than the charging current in the OFF state.
In summary, it will be seen that the present invention 1 0 provides a charging device capable of charging a 'portable telephone in the same period of time with no regard to the ON/OFF state of a power source incorporated in the telephone.
Various modifications will become possible for those skilled in the art after receiving the teachings of the present 1 5 disclosure without departing from the scope thereof.
*S*S
S
t* o S S So
Claims (3)
1. A charging device for charging a power source incorporated in a portable telephone, said device comprising: a body to which the portable telephone is to be connected; 6 a charging current source for feeding a charging current to the power source of the portable telephone; telephone detecting means for determining whether or not the portable telephone is connected to the body; ON/OFF state sensing means for determining an ON/OFF state of the power source of the portable telephone; and current control means for controlling the charging current from the charging current source in response to the ON/OFF state of the power source of the portable telephone sensed by the ON/OFF state sensing means; the current control means controls the charging current source such that, when the power source requires charging, the charging current is greater when the power source of the portable telephone is in an ON state than when the power source is in an OFF state, the power source of the portable telephone thereby being fully charged in substantially the same period of time whether the power source is in an ON state or an OFF state, 20
2. A charging device as claimed in claim 1, further comprising switching Smeans for connecting the charging current source to the power source of the portable telephone when the telephone detecting means detects the portable telephone.
3. A charging device for charging a power source incorporated in a portable telephone substantially as described herein with reference to Figs. 3 to 5 of the accompanying drawings. DATED this Seventeenth Day of May 1995 NEC Corporation 0 :Patent Attorneys for the Applicant S- SPRUSON FERGUSON INALIOCC100283:HBW CHARGING DEVICE FOR A PORTABLE TELEPHONE Abstract A charging device (20A) capable of charging a portable telephone in the same period of time with no regard to the ON/OFF state of a power source (10a) incorporated in the telephone When the connection of the telephone (10) to the charging device (20A) is detected whether or not the power source (10a) incorporated in the telephone is in an ON state is determined A charging current (26) to the telephone (10) is changed depending on the ON/OFF state of the power source (10a) of the telephone Figure 3 6* g oo* 6 S S S
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3331910A JPH05168168A (en) | 1991-12-16 | 1991-12-16 | Charger for portable telephone |
| JP3-331910 | 1991-12-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU3019492A AU3019492A (en) | 1993-06-17 |
| AU661876B2 true AU661876B2 (en) | 1995-08-10 |
Family
ID=18249005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU30194/92A Ceased AU661876B2 (en) | 1991-12-16 | 1992-12-16 | Charging device for a portable telephone |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH05168168A (en) |
| CN (1) | CN1037305C (en) |
| AU (1) | AU661876B2 (en) |
| CA (1) | CA2085385C (en) |
| GB (1) | GB2262668B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100321945B1 (en) * | 1993-06-30 | 2002-06-20 | 비센트 비.인그라시아, 알크 엠 아헨 | Recharging of electronic devices and rechargeable power supplies with internal charge regulators for controlling the application of charging current |
| JPH089002A (en) * | 1994-06-17 | 1996-01-12 | Mimasu Kinzoku Seisakusho:Kk | Portable communication equipment |
| JP2914425B2 (en) * | 1994-12-27 | 1999-06-28 | 日本電気株式会社 | Mobile phone with automatic power control function |
| JP2914259B2 (en) * | 1995-12-14 | 1999-06-28 | 日本電気株式会社 | Portable electronic device and charge control method for portable electronic device |
| JP3492541B2 (en) * | 1999-02-24 | 2004-02-03 | 埼玉日本電気株式会社 | Wireless communication equipment |
| JP2004187351A (en) * | 2002-11-29 | 2004-07-02 | Nec Corp | Portable telephone and charging method thereof |
| JP2005143217A (en) * | 2003-11-06 | 2005-06-02 | Sharp Corp | Separate power supply system |
| KR100641165B1 (en) * | 2004-09-15 | 2006-11-02 | 엘지전자 주식회사 | A method and a apparatus of compensation charging current for mobile phone |
| GB2461247A (en) * | 2008-04-22 | 2009-12-30 | Strax Uk Ltd | Charger having connection switch for portable devices |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4684870A (en) * | 1986-04-09 | 1987-08-04 | Uniden Corp. Of America | Transceiver battery charging apparatus and method |
| US4893348A (en) * | 1987-09-09 | 1990-01-09 | Mitsubishi Denki Kabushiki Kaisha | Power source control device in car telephone mobile station system |
| AU634558B2 (en) * | 1989-07-05 | 1993-02-25 | Nec Corporation | A battery charger for a portable wireless telephone set having means for tricklingly charging the battery with an increased current during a stand-by period of the telephone set |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2022802A1 (en) * | 1989-12-05 | 1991-06-06 | Steven E. Koenck | Fast battery charging system and method |
| US5185565A (en) * | 1990-10-01 | 1993-02-09 | Sanyo Electric Co., Ltd. | Charge control apparatus for use with electronic equipment |
| DE69218465T2 (en) * | 1991-01-11 | 1997-07-03 | Toshiba Communication Technolo | Adapter for supplying a portable radio telephone with voltage |
| JPH05160774A (en) * | 1991-12-09 | 1993-06-25 | Matsushita Electric Ind Co Ltd | Portable telephone set charger on-vehicle |
-
1991
- 1991-12-16 JP JP3331910A patent/JPH05168168A/en active Pending
-
1992
- 1992-12-15 CA CA002085385A patent/CA2085385C/en not_active Expired - Fee Related
- 1992-12-16 GB GB9226222A patent/GB2262668B/en not_active Expired - Fee Related
- 1992-12-16 AU AU30194/92A patent/AU661876B2/en not_active Ceased
- 1992-12-16 CN CN92115319A patent/CN1037305C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4684870A (en) * | 1986-04-09 | 1987-08-04 | Uniden Corp. Of America | Transceiver battery charging apparatus and method |
| US4893348A (en) * | 1987-09-09 | 1990-01-09 | Mitsubishi Denki Kabushiki Kaisha | Power source control device in car telephone mobile station system |
| AU634558B2 (en) * | 1989-07-05 | 1993-02-25 | Nec Corporation | A battery charger for a portable wireless telephone set having means for tricklingly charging the battery with an increased current during a stand-by period of the telephone set |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2262668B (en) | 1996-02-28 |
| GB9226222D0 (en) | 1993-02-10 |
| CA2085385C (en) | 1997-02-18 |
| CN1076061A (en) | 1993-09-08 |
| CA2085385A1 (en) | 1993-06-17 |
| AU3019492A (en) | 1993-06-17 |
| JPH05168168A (en) | 1993-07-02 |
| CN1037305C (en) | 1998-02-04 |
| GB2262668A (en) | 1993-06-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |