CA2085385C - Charging device for a portable telephone - Google Patents
Charging device for a portable telephoneInfo
- Publication number
- CA2085385C CA2085385C CA002085385A CA2085385A CA2085385C CA 2085385 C CA2085385 C CA 2085385C CA 002085385 A CA002085385 A CA 002085385A CA 2085385 A CA2085385 A CA 2085385A CA 2085385 C CA2085385 C CA 2085385C
- Authority
- CA
- Canada
- Prior art keywords
- telephone
- charging
- power source
- 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.)
- Expired - Fee Related
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
Abstract
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. When the connection of the telephone to the charging device is detected, whether or not a power source incorporated in the telephone is in an ON state is determined. A charging current to the telephone is changed depending on the ON/OFF state of the power source of the telephone.
Description
2(!~538~
CHARGING DEVICE FOR A PORTABLE TELEPHONE
BACKGROUND OF THE ~VENrrION
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 5 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 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 t h e 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 t h e telephone power source. It is a common practice with the 2 0 conventional charging device to maintain the charging current 20~5~8~
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 Tl when in an OFF state or in a 5 period of time T~ 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.
1 0 As a result, the period of time T, is longer than the period of time Tl, i.e., 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 INVl~NTION
It is, therefore, an object of the present invention t o provide a charging device capable of charging a portable telephone in the same period of time with no regard to the 2 0 ON/OFF state of a power source accommodated in the telephone.
A charging device for charging a power source incorporated in a portable telephone of the present invention comprises a body to which the portable telephone is to be connected, a charging current source for feeding a current to 2 5 the power source of the portable telephone, a telephone ,~
2085~8S
detecting section for determining whether or not the portable telephone is connected to the body, an ON/OFF state sensing section for determining an ON/OFF state of the power source of the portable telephone, and a current control section for 5 controlling a charging current from the charging current source on the basis of the ON/OFF state of the power source of the portable telephone sensed by the ON/OFF state sensing section.
BRIEF DESCRIPTION OF THE DRAWINGS
1 0 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 1 5 conventional charging device for a portable telephone;
FIG. 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 state;
FIG. 3 is a block diagram of a charging device embodying 2 0 the present 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 2 5 s peci ~icall y .
~'2' DESCRI~ION OF I~HE 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 5 telephone 10 is loaded with a battery or similar power source 1 Oa and may be removably connected to a charging device 20.
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 10 detecting section 22, and a charging current source 2~. 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 1 Oa.
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 lOa is turned off, i.e., in an OFF state while charging is under way, it is fully charged at a time Tl.
However, when the power source lOa is in an ON state, part of the charging current is consumed as an operating current of the telephone 10, i.e., the power source lOa is charged by a current 2 5 smaller than the current actually fed from the charging unit 20.
~, 2Q~5385 As a result, a period of time T, (T~ > Tl) is needed for the power source 10a to be fully charged. For example, assume that when Il is 40 milliamperes, Tl is 10 hours, that the telephone 10 consumes a current Io of 30 milliamperes in a waiting state, 5 and that a charging current in the ON state of the power source 10a is I~. Then, there holds an equation:
I, = Il - Io = 40 - 30 = 10 ~milliamperes) The charging time T~ is expressed as:
T~ = Tl x Il/ I = 40 (hours) 1 0Such a period of time T~ is four times as long as the period of time Tl and, therefore, not practical.
Referring to FIGS. 2-5, a charging device embodying the present invention and free from the above problem will be described. In FIGS. 2-5, the same or similar constituents to the 1 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, h a s an ON/OFF state sensing section 28 and a current control 2 0 section 30 in addition to the constituents of the conventional charging device 20, FIG. 1. The sensing section 28 determines whether or not the power source 10a of the telephone 10 is in 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 current of the charging current source 26 in response to an output o~ 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 Il = 40 milli~mperes, Tl = 10 hours, and T~ = 40 hours, then Il(T~- Tl) = 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 1 0a is in an OFF state, a charging current Il 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 I~ (I, > Il) is fed to the telephone 10 in order to compensate for the charge Il ( T~ - Tl ) being consumed during charging. When 1, is selected to be 160 milli~mperes to satisfy an equation 1 5 Il(T2- Tl) = (I,- Il)Tl, the telephone 10 can be fully charged in the same period of time with no regard to the ON/OFF state of the power source 10a, as shown in FIG. 4.
FIG. 5 shows the charging device 20A and telephone power source 10a more specifically. As shown, when a transistor TR6 2 0 constituting a telephone detecting section 22 is turned on by a signal BATT, it indicates that a battery Ba implementing the power source 1 Oa is connected to the charging device 2 0 A .
Then, a transistor TR2 constituting a switch 24 is rendered conductive to connect a charging current source 26 to the p o w e r 2 5 source 10a. At the same time, the telephone 10 sends a signal 208538~
PSON to a transistor TR5 constituting the ON/OFF state sensing section 28, 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 5 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.
CHARGING DEVICE FOR A PORTABLE TELEPHONE
BACKGROUND OF THE ~VENrrION
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 5 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 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 t h e 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 t h e telephone power source. It is a common practice with the 2 0 conventional charging device to maintain the charging current 20~5~8~
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 Tl when in an OFF state or in a 5 period of time T~ 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.
1 0 As a result, the period of time T, is longer than the period of time Tl, i.e., 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 INVl~NTION
It is, therefore, an object of the present invention t o provide a charging device capable of charging a portable telephone in the same period of time with no regard to the 2 0 ON/OFF state of a power source accommodated in the telephone.
A charging device for charging a power source incorporated in a portable telephone of the present invention comprises a body to which the portable telephone is to be connected, a charging current source for feeding a current to 2 5 the power source of the portable telephone, a telephone ,~
2085~8S
detecting section for determining whether or not the portable telephone is connected to the body, an ON/OFF state sensing section for determining an ON/OFF state of the power source of the portable telephone, and a current control section for 5 controlling a charging current from the charging current source on the basis of the ON/OFF state of the power source of the portable telephone sensed by the ON/OFF state sensing section.
BRIEF DESCRIPTION OF THE DRAWINGS
1 0 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 1 5 conventional charging device for a portable telephone;
FIG. 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 state;
FIG. 3 is a block diagram of a charging device embodying 2 0 the present 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 2 5 s peci ~icall y .
~'2' DESCRI~ION OF I~HE 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 5 telephone 10 is loaded with a battery or similar power source 1 Oa and may be removably connected to a charging device 20.
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 10 detecting section 22, and a charging current source 2~. 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 1 Oa.
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 lOa is turned off, i.e., in an OFF state while charging is under way, it is fully charged at a time Tl.
However, when the power source lOa is in an ON state, part of the charging current is consumed as an operating current of the telephone 10, i.e., the power source lOa is charged by a current 2 5 smaller than the current actually fed from the charging unit 20.
~, 2Q~5385 As a result, a period of time T, (T~ > Tl) is needed for the power source 10a to be fully charged. For example, assume that when Il is 40 milliamperes, Tl is 10 hours, that the telephone 10 consumes a current Io of 30 milliamperes in a waiting state, 5 and that a charging current in the ON state of the power source 10a is I~. Then, there holds an equation:
I, = Il - Io = 40 - 30 = 10 ~milliamperes) The charging time T~ is expressed as:
T~ = Tl x Il/ I = 40 (hours) 1 0Such a period of time T~ is four times as long as the period of time Tl and, therefore, not practical.
Referring to FIGS. 2-5, a charging device embodying the present invention and free from the above problem will be described. In FIGS. 2-5, the same or similar constituents to the 1 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, h a s an ON/OFF state sensing section 28 and a current control 2 0 section 30 in addition to the constituents of the conventional charging device 20, FIG. 1. The sensing section 28 determines whether or not the power source 10a of the telephone 10 is in 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 current of the charging current source 26 in response to an output o~ 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 Il = 40 milli~mperes, Tl = 10 hours, and T~ = 40 hours, then Il(T~- Tl) = 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 1 0a is in an OFF state, a charging current Il 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 I~ (I, > Il) is fed to the telephone 10 in order to compensate for the charge Il ( T~ - Tl ) being consumed during charging. When 1, is selected to be 160 milli~mperes to satisfy an equation 1 5 Il(T2- Tl) = (I,- Il)Tl, the telephone 10 can be fully charged in the same period of time with no regard to the ON/OFF state of the power source 10a, as shown in FIG. 4.
FIG. 5 shows the charging device 20A and telephone power source 10a more specifically. As shown, when a transistor TR6 2 0 constituting a telephone detecting section 22 is turned on by a signal BATT, it indicates that a battery Ba implementing the power source 1 Oa is connected to the charging device 2 0 A .
Then, a transistor TR2 constituting a switch 24 is rendered conductive to connect a charging current source 26 to the p o w e r 2 5 source 10a. At the same time, the telephone 10 sends a signal 208538~
PSON to a transistor TR5 constituting the ON/OFF state sensing section 28, 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 5 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.
Claims (3)
1. A charging device for charging a power source incorporated in a portable telephone, comprising:
a body to which the portable telephone is to be connected;
a charging current source for feeding a current to the power source of the portable telephone;
telephone detecting means for determining whether or not the portable telephone is connected to said 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 a charging current from said charging current source on the basis of the ON/OFF
state of the power source of the portable telephone sensed by said ON/OFF state sensing means.
a body to which the portable telephone is to be connected;
a charging current source for feeding a current to the power source of the portable telephone;
telephone detecting means for determining whether or not the portable telephone is connected to said 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 a charging current from said charging current source on the basis of the ON/OFF
state of the power source of the portable telephone sensed by said ON/OFF state sensing means.
2. A charging device as claimed in claim 1, wherein said current control means controls said charging current source such that the charging current is greater when the power source of the portable telephone is in an ON state than when said power source is in an OFF state.
3. A charging device as claimed in claim 1, further comprising switching means for connecting said charging current source to the power source of the portable telephone when said telephone detecting means detects said portable telephone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3-331910 | 1991-12-16 | ||
| JP3331910A JPH05168168A (en) | 1991-12-16 | 1991-12-16 | Charger for portable telephone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2085385A1 CA2085385A1 (en) | 1993-06-17 |
| CA2085385C true CA2085385C (en) | 1997-02-18 |
Family
ID=18249005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002085385A Expired - Fee Related CA2085385C (en) | 1991-12-16 | 1992-12-15 | 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 |
|---|---|---|---|---|
| BR9405440A (en) * | 1993-06-30 | 1999-09-08 | Motorola Inc | Electronic device releasably connectable to variable-level power source and rechargeable rechargeable power source process. |
| 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 |
Family Cites Families (7)
| 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 |
| JPH0793649B2 (en) * | 1987-09-09 | 1995-10-09 | 三菱電機株式会社 | Telephone device |
| JPH0340728A (en) * | 1989-07-05 | 1991-02-21 | Nec Corp | Portable radio telephone charger |
| 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 |
| EP0494780B1 (en) * | 1991-01-11 | 1997-03-26 | Kabushiki Kaisha Toshiba | An adapter unit for adaptively supplying a portable radio telephone with power |
| 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 AU AU30194/92A patent/AU661876B2/en not_active Ceased
- 1992-12-16 GB GB9226222A patent/GB2262668B/en not_active Expired - Fee Related
- 1992-12-16 CN CN92115319A patent/CN1037305C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB2262668B (en) | 1996-02-28 |
| JPH05168168A (en) | 1993-07-02 |
| CA2085385A1 (en) | 1993-06-17 |
| CN1076061A (en) | 1993-09-08 |
| AU3019492A (en) | 1993-06-17 |
| GB9226222D0 (en) | 1993-02-10 |
| GB2262668A (en) | 1993-06-23 |
| AU661876B2 (en) | 1995-08-10 |
| CN1037305C (en) | 1998-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |