CA2199214A1 - External Power Source to Main Battery Power Source Switch - Google Patents

External Power Source to Main Battery Power Source Switch

Info

Publication number
CA2199214A1
CA2199214A1 CA2199214A CA2199214A CA2199214A1 CA 2199214 A1 CA2199214 A1 CA 2199214A1 CA 2199214 A CA2199214 A CA 2199214A CA 2199214 A CA2199214 A CA 2199214A CA 2199214 A1 CA2199214 A1 CA 2199214A1
Authority
CA
Canada
Prior art keywords
power source
source terminal
voltage
adapter
main 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
CA2199214A
Other languages
French (fr)
Other versions
CA2199214C (en
Inventor
Shakil H. Barkat
Gregory Redmond Black
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of CA2199214A1 publication Critical patent/CA2199214A1/en
Application granted granted Critical
Publication of CA2199214C publication Critical patent/CA2199214C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/30—Modifications for providing a predetermined threshold before switching
    • H03K17/302—Modifications for providing a predetermined threshold before switching in field-effect transistor switches
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • 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
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching

Abstract

A switching circuit (30) in a portable telephone connects a gate of a field-effect transistor (Q1) to a voltage below the transistor's gate threshold voltage when the voltage at a first power source terminal (B) falls below a threshold voltage, thus disconnecting the first power source terminal (B) from a portable telephone power input terminal (B+) and connecting a second power source terminal (A) to the power input terminal (B+). The threshold voltage is set at a voltage above the minimum supply voltage of the portable telephone. The first power source terminal may be connected to a main battery and the second power source terminal may be connected to an adapter such as a battery eliminator adapter, hands-free adapter, or mobile transceiver adapter. This switching circuit prevents a call in progress from being disconnected when power sources are exchanged during a GSM burst.
CA002199214A 1996-03-13 1997-03-05 External power source to main battery power source switch Expired - Fee Related CA2199214C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/614,604 US5862493A (en) 1996-03-13 1996-03-13 External power source to main battery power sources switch
US08/614,604 1996-03-13

Publications (2)

Publication Number Publication Date
CA2199214A1 true CA2199214A1 (en) 1997-09-13
CA2199214C CA2199214C (en) 2000-05-16

Family

ID=24461978

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002199214A Expired - Fee Related CA2199214C (en) 1996-03-13 1997-03-05 External power source to main battery power source switch

Country Status (14)

Country Link
US (1) US5862493A (en)
JP (1) JPH09261891A (en)
KR (1) KR100223511B1 (en)
CN (1) CN1086097C (en)
AU (1) AU711320B2 (en)
BR (1) BR9701265A (en)
CA (1) CA2199214C (en)
DE (1) DE19709806B4 (en)
FI (1) FI971063A (en)
FR (1) FR2746242B1 (en)
GB (1) GB2311179B (en)
IT (1) IT1295705B1 (en)
SG (1) SG67376A1 (en)
TW (1) TW379477B (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3134802B2 (en) * 1997-03-24 2001-02-13 日本電気株式会社 Mobile communication apparatus, power supply apparatus and power supply method for mobile communication apparatus, and data terminal connection modem card connectable to mobile communication apparatus
US6097973A (en) * 1997-12-19 2000-08-01 Motorola, Inc. Electronic circuit for a portable electronic device
KR100512377B1 (en) * 1997-12-29 2005-11-30 삼성전자주식회사 Power switch of wireless communication terminal system
US6167289A (en) * 1998-02-20 2000-12-26 Qualcomm Incorporated Power supply assembly for portable phone
AU2002353314A1 (en) * 2001-12-21 2003-07-09 Koninklijke Philips Electronics N.V. Communication bus system operable in a sleep mode and a normal mode
US7215766B2 (en) * 2002-07-22 2007-05-08 Lightspeed Aviation, Inc. Headset with auxiliary input jack(s) for cell phone and/or other devices
CN1310396C (en) * 2002-08-02 2007-04-11 华为技术有限公司 Power supply switching circuit for detection
KR100498047B1 (en) * 2003-03-05 2005-07-01 삼성전자주식회사 Method and Aparatus for reduce extra current consumption of mobile device
US7053691B2 (en) 2003-05-06 2006-05-30 Hewlett-Packard Development Company, L.P. Electrical circuit for selecting a desired power source
CN100407543C (en) * 2006-06-27 2008-07-30 福建师范大学 Voltage regulator circuit of electronic apparatus power supplied by duplexing power sources with spare battery
CN101136558B (en) * 2006-09-02 2010-08-18 深圳迈瑞生物医疗电子股份有限公司 Power supply system and switch circuit, switch method of main power source and backup battery
US8290171B1 (en) * 2009-08-20 2012-10-16 Maxim Integrated Products, Inc. Headset with microphone and wired remote control
US8772966B1 (en) 2011-05-18 2014-07-08 Applied Micro Circuits Corporation System and method for selecting a power supply source
CN103795392A (en) * 2014-02-28 2014-05-14 吴圣铎 Finger-touch cigarette lighter
CN104731074B (en) * 2015-03-18 2017-10-10 安徽惠洲地质安全研究院股份有限公司 A kind of geophysical prospecting equipment tele-control system and its control method based on mine technology of Internet of things
WO2017207713A1 (en) 2016-06-01 2017-12-07 Ascensia Diabetes Care Holdings Ag Systems, apparatus, and methods for powering electronic devices with low voltage batteries
US10038370B2 (en) * 2016-09-27 2018-07-31 Fairchild Semiconductor Corporation Reduction of electrical size of bulk capacitors in mobile power supplies

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58500820A (en) * 1981-05-27 1983-05-19 マステク、コ−パレイシヤン Integrated circuit operating method and integrated circuit operating power control circuit
JPH0650825B2 (en) * 1988-01-29 1994-06-29 日本電気株式会社 Wireless telephone
US5036532A (en) * 1989-08-03 1991-07-30 Motorola, Inc. Portable telephone with power source/mode change during calls
US5206538A (en) * 1991-04-03 1993-04-27 At&T Bell Laboratories Automatic system battery reconnect circuit responsive to insertion of new battery replacement
JPH0530005A (en) * 1991-07-18 1993-02-05 Matsushita Electric Ind Co Ltd Power supply changeover circuit for small sized portable telephone set
JPH0556577A (en) * 1991-08-27 1993-03-05 Seikosha Co Ltd Power supply controller
US5608273A (en) * 1991-11-25 1997-03-04 At&T Global Information Solutions Company Battery back-up for electronic circuits
US5287053A (en) * 1992-07-06 1994-02-15 Motorola, Inc. Power supply with a battery disconnect
KR950007973B1 (en) * 1992-11-27 1995-07-21 삼성전자주식회사 The high-frequency output-level compensating circuit of mobile phone
JP2856675B2 (en) * 1994-06-27 1999-02-10 日本電気株式会社 Wireless selective call receiver with portable information processing device and I / F

Also Published As

Publication number Publication date
CN1086097C (en) 2002-06-05
MX9701892A (en) 1997-09-30
FR2746242B1 (en) 1999-12-31
FR2746242A1 (en) 1997-09-19
TW379477B (en) 2000-01-11
JPH09261891A (en) 1997-10-03
KR970068267A (en) 1997-10-13
FI971063A0 (en) 1997-03-13
US5862493A (en) 1999-01-19
GB2311179A (en) 1997-09-17
FI971063A (en) 1997-09-14
IT1295705B1 (en) 1999-05-27
AU711320B2 (en) 1999-10-14
GB2311179B (en) 2000-07-12
AU1494297A (en) 1997-09-18
SG67376A1 (en) 1999-09-21
KR100223511B1 (en) 1999-10-15
BR9701265A (en) 1998-11-10
GB9703523D0 (en) 1997-04-09
CA2199214C (en) 2000-05-16
ITRM970127A1 (en) 1998-09-07
DE19709806A1 (en) 1997-11-06
CN1166121A (en) 1997-11-26
DE19709806B4 (en) 2005-04-21

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20050307