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GB2239567A - Portable radio telephone useable with batteries of different types; battery charging - Google Patents

Portable radio telephone useable with batteries of different types; battery charging Download PDF

Info

Publication number
GB2239567A
GB2239567A GB9007681A GB9007681A GB2239567A GB 2239567 A GB2239567 A GB 2239567A GB 9007681 A GB9007681 A GB 9007681A GB 9007681 A GB9007681 A GB 9007681A GB 2239567 A GB2239567 A GB 2239567A
Authority
GB
United Kingdom
Prior art keywords
battery
telephone
portable radio
radio telephone
resistor
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.)
Withdrawn
Application number
GB9007681A
Other versions
GB9007681D0 (en
Inventor
Mark Powell
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.)
Nokia Mobile Phones UK Ltd
Original Assignee
Technophone Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Technophone Ltd filed Critical Technophone Ltd
Priority to GB9007681A priority Critical patent/GB2239567A/en
Publication of GB9007681D0 publication Critical patent/GB9007681D0/en
Priority to GB9105573A priority patent/GB2242083B/en
Priority to DE9103661U priority patent/DE9103661U1/en
Priority to ITMI910903A priority patent/IT1245771B/en
Priority to FR919104101A priority patent/FR2661296B3/en
Publication of GB2239567A publication Critical patent/GB2239567A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/296—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by terminals of battery packs
    • 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00038—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors
    • 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
    • H02J7/00047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with provisions for charging different types of batteries
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3883—Arrangements for mounting batteries or battery chargers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
    • 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

Landscapes

  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Biophysics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Battery Mounting, Suspending (AREA)
  • Telephone Set Structure (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A portable cellular telephone 1 is adapted to have removably connected thereto a battery 2 selected from at least two different battery types. The resistance of a resistor 7 in the battery 2 identifies the battery type which can be detected in the telephone 1 by means of a voltage source 10, a voltage sensor 13 and a resistor 11 forming a potential divider with resistor 7. The types of battery may be low and high energy versions of batteries having essentially the same chemical and physical composition, or batteries of different chemical and/or physical composition. When the telephone 1 is coupled to a battery charger, a control signal is generated by a microprocessor 9 so that a charging mode compatible with the battery type in use is established. The microprocessor 9 may disable the telephone if it detects an unrecognisable battery, ie. without a resistor having an expected value. The battery temperature indicated by a thermistor 6 may be used to compensate battery voltage levels monitored during recharging to give a more accurate indication of charge state. <IMAGE>

Description

BATTERY POWERED RADIO TELEPHONE This invention relates to a hand portable radio telephone adapted to have removably connected thereto a battery selected from at least two different battery types.
It is nowadays common practice for rechargeable batteries to be used in hand-held radio telephones, such as cellular telephones. However, particularly because of their transmission capability, portable cellular telephones consume a significant amount of power necessitating relatively frequent recharging of the batteries.
High energy batteries are therefore sometimes used when a longer interval is desirable between re-charging.
However, the higher the energy of the battery, the heavier and more bulky it tends to be. It is particularly convenient therefore if the telephone is adapted to use interchangeably either a high or low energy battery selected by the user depending on the particular circumstances under which he intends to use the telephone. Hence, a low energy battery would be suitable if the user intends to use the telephone for relatively few short telephone calls over a given period, whereas a high energy battery may be more suitable if it is intended to make longer or more calls over an extended period.
A drawback with using different battery types is that they may require different recharging regimes which, if not adhered to, may adversely affect performance and/or the overall useful life time of the batteries.
According to a first aspect of the present invention there is provided a hand portable radio telephone adapted to have removably connected thereto a battery selected from at least two different types of battery, said battery comprising means for identifying the battery type, wherein the telephone comprises means responsive to said identifying means for determining the type of battery connected thereto.
A radio telephone in accordance with the invention is capable of detecting the type of battery connected thereto and therefore can respond accordingly, especially with regard to the mode of recharging used.
It is noted here that the different types of battery may be low and high energy versions of batteries having essentially the same chemical and-physical composition or they may alternatively be batteries having different chemical and/or physical composition.
The radio telephone may be adapted to become inoperative if it detects an unrecognisable or unidentified battery.
Suitably the battery type determining means includes means for deriving a signal indicative of the battery type. Specifically, the determining means may include means for generating a reference signal, in which case the identifying means (in the battery) is adapted to modify the reference signal to provide the signal indicative of the battery type.
Preferably the battery comprises a unitary housing enclosing the identifying means which may, for example, be formed by a single resistor, the resistance value of which represents the battery type. The battery determining means in the telephone may also comprise a resistor of known resistance value connected to a known voltage source. When the battery is connected to the telephone these two resistors are arranged to be connected together in the manner of a potential divider whereby the voltage at the junction of the two resistors is indicative of the battery type.
Therefore, means are also provided for sensing the voltage between these two resistors.
In a particular embodiment complementary connecting means are provided respectively on the telephone and on the battery for automatically coupling the two resistors in series when the battery is connected to the telephone.
According to a further aspect of the present invention there is provided a battery for use in a hand portable radio telephone in accordance with the first aspect of the invention, comprising a housing enclosing a plurality of interconnected rechargeable cells and means for electrically identifying the battery type.
An embodiment of the invention will now be described by way of example, with reference to the accompanying drawings in which: Figure 1 is a schematic illustration of a radio telephone shown separated from an interchangeable battery in accordance with the invention, and Figure 2 is a perspective view of the radio telephone in Figure 1, with the battery connected to the telephone.
The apparatus shown in Figures 1 and 2 is a cellular portable telephone 1 comprising a rechargeable battery pack 2. The battery pack 2 may for example contain six identical series-connected NiCd cells 3 each having a nominal voltage of l.2V. The battery pack, therefore, has a nominal voltage of 7.2V. The capacity of the cells is typically 600 mAh for a regular battery pack, whereas in the case of a high energy version the capacity may be, for example, 850 mAh.
The individual cells are rectangular in cross-section and are arranged side-by-side in close packed configuration to yield a particularly compact battery pack 2. In an alternative arrangement the cells may be arranged in two rows of three cells, for example. In any case the cells 3 and associated circuitry (described hereinafter) are enclosed in a unitary housing 5.
The battery housing 5 comprises a socket 4 having 4 connectors 4a, 4b, 4c, 4d. Socket 4a is connected to the positive terminal of the cells 3 via a fuse 14 and socket 4d is connected to the negative terminal of the cells 3. Socket 4b is connected to the negative terminal (effectively earth) via a thermistor 6 located in the close proximity of the cells 3 so that the signal appearing on terminal 4b is indicative of the local temperature of the battery.
Socket 4c is connected to the negative terminal of the cells 3 (effectively earth) via a resistor 7. The value of the resistor indicates the type of battery being used. For example, the Applicant has used a resistor of 47,000 ohms to identify a regular-energy battery having a capacity of 600 mAh, and a resistor of 68,000 ohms to identify a high-energy battery having a capacity of 850 mAh.
The battery 2 is capable of being connected to the telephone 1 as indicated by the arrow in Figure 1.
Figure 2 shows the battery 2 connected to the telephone 1. The battery may be fitted by any suitable mechanical means, for example a battery 2 may be arranged to fit slideably onto the telephone 1. The telephone comprises an electrical connector 8 comprising protruding conductive pins 8a, 8b, 8c, 8d which engage respectively in the connectors 4a, 4b, 4c, 4d of socket 4 in the battery 2 when the battery is fully inserted on the telephone.
For the sake of clarity the positive and negative terminals 8a and 8d of connector 8 are shown without any further connections. Of course in practice these terminals would be connected to the main telephone circuitry for providing power thereto. It is noted here that the telephone 1 also includes a transceiver and all the other features conventionally found in a cellular telephone, but which also for the sake of clarity are not shown in the Figures. Also, since these aspects of the telephone are not relevant to the instant invention no further details will be given here, except to reiterate that the circuitry in the telephone is connected to the terminals 8a and 8d. Terminal 8b connects with terminal 4b on the battery and, as mentioned above, the signal appearing thereon is indicative of the local temperature in the circuitry of the battery 2.This signal is applied to a microprocessor 9 within the telephone, which may use this temperature information to compensate for values of the battery voltage monitored during re-charging to give a more accurate indication of the charge state of the battery.
Terminal 8c of the telephone, which contacts connector 4c of the battery, is connected within the telephone 1 to a voltage source 10 generating a known voltage of, for example +5V via a resistor 11 having a known value of, for example, 180,000 ohms. Thus when the battery 2 is connected to the telephone the resistor 11 in the telephone is connected in series with the resistor 7 in the battery 2 in the manner of a potential divider.
Indeed, the voltage at the junction 12 between the two resistors 10 and 7 indicates the value of the resistor 7 in the battery and hence is representative of the type of battery connected. For example with the values mentioned herein, when a regular-energy battery 2 is in use the voltage at junction 12 will be 1V, and when a high energy battery is used the voltage at junction 12 will be l.5V.
A voltage sensor 13 is used to monitor the voltage at junction 12 and to feed a signal indicative thereof to microprocessor 9. The microprocessor may respond particularly for example during recharging to ensure that the battery is recharged in accordance with a mode compatible with the battery type. To this end the telephone may be adapted to be coupled to a charging unit capable of operating in different charging modes in response to a control signal generated by the telephone, and managed by the microprocessor, as described and claimed in our co-pending British patent C application No. L (Our Ref PAT 90005).
Additionally or alternatively the microprocessor 9 may respond by rendering the whole telephone inoperative if a battery is used which does not include an identifying resistor, of if the value of such a resistor does not match an expected value i.e. indicating an unauthorised battery.
In view of the foregoing description, it will be evident to a person skilled in the art that various modifications may be made within the scope of the invention. In particular, the telephone may be capable of operating with more than two different battery types in which each type would be identified by its own unique resistance value. Furthermore the different battery type need not merely be a battery having a different electrical capacity, but may indeed have a different chemical or physical composition and therefore require a different charging regime which can thus be provided in response to the identifying signal sensed within the telephone.

Claims (12)

1. A hand portable radio telephone adapted to have removably connected thereto a battery selected from at least two different types of battery, said battery comprising means for identifying the battery type, wherein the telephone comprises means responsive to said identifying means for determining the type of battery connected thereto.
2. A hand portable radio telephone as claimed in claim 1, wherein the determining means includes means for deriving a signal indicative of the battery type.
3. A hand portable radio telephone as claimed in claim 1 or claim 2, wherein the determining means includes means for generating a predetermined signal, and the identifying means is adapted to modify the predetermined signal to provide a signal indicative of the battery type.
4. A hand portable radio telephone as claimed in any of the preceding claims wherein the battery comprises a unitary housing enclosing said identifying means.
5. A hand portable radio telephone as claimed in any of the preceding claims, wherein the identifying means comprises a first resistor, the resistance thereof being representative of the battery type.
6. A hand portable radio telephone as claimed in claim 5, wherein the battery type determining means comprises a second resistor connected to a voltage source, said first and second resistors being connected in series when the battery is connected to the telephone.
7. A hand portable radio telephone as claimed in claim 6, including complementary connecting means provided respectively on the telephone and on the battery for coupling said first and second resistors in series.
8. A hand portable radio telephone as claimed in claim 6 or 7, wherein the battery type determining means further comprises means for sensing the voltage between said first and second resistors.
9. A hand portable radio telephone as claimed in any of the preceding claims, the battery further including means for generating a signal indicative of the temperature in the locality of the battery, means being provided for conveying said temperature indicative signal to said telephone.
10. A hand portable telephone adapted to have removably connected thereto a battery selected from at least two distinct battery types, substantially as herein described with reference to and illustrated in Figures 1 and 2 of the accompanying drawings.
11. A battery for use in a hand portable telephone claimed in any of the preceding claims, comprising a housing enclosing a plurality of interconnected rechargeable cells and means for electrically identifying the battery type.
12. A battery as claimed in claim 11 wherein the identifying means comprises a resistor.
GB9007681A 1990-04-05 1990-04-05 Portable radio telephone useable with batteries of different types; battery charging Withdrawn GB2239567A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB9007681A GB2239567A (en) 1990-04-05 1990-04-05 Portable radio telephone useable with batteries of different types; battery charging
GB9105573A GB2242083B (en) 1990-04-05 1991-03-15 Battery powered radio telephone
DE9103661U DE9103661U1 (en) 1990-04-05 1991-03-25 Battery-operated radio telephone
ITMI910903A IT1245771B (en) 1990-04-05 1991-04-02 BATTERY POWERED RADIO TELEPHONE
FR919104101A FR2661296B3 (en) 1990-04-05 1991-04-04 PORTABLE RADIOTELEPHONE POWERED BY BATTERY.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9007681A GB2239567A (en) 1990-04-05 1990-04-05 Portable radio telephone useable with batteries of different types; battery charging

Publications (2)

Publication Number Publication Date
GB9007681D0 GB9007681D0 (en) 1990-06-06
GB2239567A true GB2239567A (en) 1991-07-03

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
GB9007681A Withdrawn GB2239567A (en) 1990-04-05 1990-04-05 Portable radio telephone useable with batteries of different types; battery charging
GB9105573A Expired - Lifetime GB2242083B (en) 1990-04-05 1991-03-15 Battery powered radio telephone

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB9105573A Expired - Lifetime GB2242083B (en) 1990-04-05 1991-03-15 Battery powered radio telephone

Country Status (4)

Country Link
DE (1) DE9103661U1 (en)
FR (1) FR2661296B3 (en)
GB (2) GB2239567A (en)
IT (1) IT1245771B (en)

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GB2262401A (en) * 1991-12-09 1993-06-16 Matsushita Electric Ind Co Ltd Vehicle-mounted charging apparatus for a portable telephone set
EP0568390A1 (en) * 1992-05-01 1993-11-03 Lucas Industries Public Limited Company Battery charge monitoring
EP0641089A2 (en) * 1993-08-31 1995-03-01 Nec Corporation Portable radio apparatus having batteries for supplying a plurality of voltages
EP0642202A2 (en) * 1993-08-30 1995-03-08 YAESU MUSEN Co., Ltd. Electronic device, battery pack and charger for the battery pack
WO1995006994A1 (en) * 1993-09-02 1995-03-09 Motorola Inc. Tracking external power supply
WO1995008238A1 (en) * 1993-09-13 1995-03-23 Motorola, Inc. Charge regulator for electronic device and associated method
FR2713028A1 (en) * 1993-11-09 1995-06-02 Motorola Inc Device and method for determining the type of external power supply.
EP0712226A1 (en) * 1994-11-10 1996-05-15 Philips Patentverwaltung GmbH Battery pack for a mobile telephone
GB2307804A (en) * 1995-11-30 1997-06-04 Matsushita Electric Ind Co Ltd Battery charging control circuit
EP0786821A1 (en) * 1996-01-29 1997-07-30 Sony Corporation Battery discriminating method, dry battery cell pack, and electronic device
US5656917A (en) * 1995-12-14 1997-08-12 Motorola, Inc. Battery identification apparatus and associated method
WO1998009418A1 (en) * 1996-08-30 1998-03-05 Ericsson Omc Limited Battery units
US5737706A (en) * 1995-08-03 1998-04-07 Bell Atlantic Network Services, Inc. Power system supporting CDPD operation
US5834921A (en) * 1996-07-02 1998-11-10 Telefonaktiebolaget Lm Ericsson Safety device for a portable battery-powered electric apparatus
US5859522A (en) * 1997-07-16 1999-01-12 Motorola, Inc. Accessory identification apparatus and method
US5925942A (en) * 1997-07-16 1999-07-20 Motorola, Inc. Power supply control apparatus and method suitable for use in an electronic device
EP0949698A2 (en) * 1998-04-06 1999-10-13 Sony Corporation Battery pack, battery charger and electronic equipment using battery pack
EP0952683A2 (en) * 1998-04-20 1999-10-27 Nokia Mobile Phones Ltd. Method to control the power consumption of a mobile station
US6157836A (en) * 1995-06-07 2000-12-05 Pacific Communication Sciences, Inc. Portable communications and data terminal operating to optimize receipt of both incoming CDPD and AMPS messages
US6434395B1 (en) * 1993-09-08 2002-08-13 Pacific Communications Sciences, Inc. Portable communications and data terminal having multiple modes of operation
EP1657622A1 (en) * 2004-11-12 2006-05-17 Hewlett-Packard Development Company, L.P. Power management system and method
US7285935B2 (en) 2003-03-12 2007-10-23 Renishaw Plc Battery life determination
US7835534B2 (en) 2003-10-14 2010-11-16 Robert Bosch Gmbh Battery charging jobsite lunchbox
US20120223671A1 (en) * 2011-03-03 2012-09-06 Lenovo (Singapore) Pte. Ltd. Battery Authentication Method and Apparatus
US8384340B2 (en) 2007-06-26 2013-02-26 The Coleman Company, Inc. Electrical appliance that utilizes multiple power sources
US8604752B2 (en) 2003-10-14 2013-12-10 Robert Bosch Gmbh Portable battery charging and audio unit
US10678905B2 (en) 2011-03-18 2020-06-09 Lenovo (Singapore) Pte. Ltd. Process for controlling battery authentication

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JPH06124731A (en) * 1992-08-31 1994-05-06 Toshiba Corp Attachment for external battery connection, battery pack and battery discrimination and control method
US5470255A (en) * 1993-03-23 1995-11-28 The Whitaker Corporation Extended height connector for a battery
JPH07307696A (en) * 1994-05-12 1995-11-21 Oki Electric Ind Co Ltd Portable electronic device
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JP2845822B2 (en) * 1996-07-17 1999-01-13 埼玉日本電気株式会社 Charge circuit with erroneous charge prevention function
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US4593409A (en) * 1984-04-04 1986-06-03 Motorola, Inc. Transceiver protection arrangement
EP0181112A2 (en) * 1984-10-29 1986-05-14 Christie Electric Corp. Controller for battery charger
GB2219151A (en) * 1988-05-03 1989-11-29 Ullmann Ulo Werk Battery charging
EP0340794A2 (en) * 1988-05-06 1989-11-08 Nec Corporation Portable apparatus with variable rating battery charger for recharging interchangeable battery packs

Cited By (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2262401A (en) * 1991-12-09 1993-06-16 Matsushita Electric Ind Co Ltd Vehicle-mounted charging apparatus for a portable telephone set
GB2262401B (en) * 1991-12-09 1995-08-23 Matsushita Electric Ind Co Ltd Vehicle-mounted charging apparatus for portable telephone sets
EP0568390A1 (en) * 1992-05-01 1993-11-03 Lucas Industries Public Limited Company Battery charge monitoring
AU683534B2 (en) * 1993-06-30 1997-11-13 Motorola, Inc. Tracking external power supply
EP0642202A3 (en) * 1993-08-30 1995-05-10 Yaesu Musen Kk Electronic device, battery pack and charger for the battery pack.
US5627449A (en) * 1993-08-30 1997-05-06 Yaesu Musen Co., Ltd. Electronic device, battery pack and charger for the battery pack
EP0642202A2 (en) * 1993-08-30 1995-03-08 YAESU MUSEN Co., Ltd. Electronic device, battery pack and charger for the battery pack
EP0641089A3 (en) * 1993-08-31 1995-10-04 Nec Corp Portable radio apparatus having batteries for supplying a plurality of voltages.
EP0641089A2 (en) * 1993-08-31 1995-03-01 Nec Corporation Portable radio apparatus having batteries for supplying a plurality of voltages
US5628054A (en) * 1993-08-31 1997-05-06 Nec Corporation Portable radio apparatus having batteries for supplying a plurality of voltages
GB2288292B (en) * 1993-09-02 1998-03-25 Motorola Inc Tracking external power supply
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ITMI910903A1 (en) 1992-10-02
GB9007681D0 (en) 1990-06-06
DE9103661U1 (en) 1991-06-13
IT1245771B (en) 1994-10-18
GB2242083B (en) 1993-01-13
GB2242083A (en) 1991-09-18
GB9105573D0 (en) 1991-05-01
FR2661296A3 (en) 1991-10-25
ITMI910903A0 (en) 1991-04-02
FR2661296B3 (en) 1992-03-13

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