JPS61140879A - Battery warning circuit - Google Patents

Battery warning circuit

Info

Publication number
JPS61140879A
JPS61140879A JP59262706A JP26270684A JPS61140879A JP S61140879 A JPS61140879 A JP S61140879A JP 59262706 A JP59262706 A JP 59262706A JP 26270684 A JP26270684 A JP 26270684A JP S61140879 A JPS61140879 A JP S61140879A
Authority
JP
Japan
Prior art keywords
voltage
battery
external battery
switch
comparator
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.)
Pending
Application number
JP59262706A
Other languages
Japanese (ja)
Inventor
Hirotaka Kobayashi
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP59262706A priority Critical patent/JPS61140879A/en
Publication of JPS61140879A publication Critical patent/JPS61140879A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make a two-system warning display of a battery by using an internal and an external battery by setting a comparator input voltage higher by the voltage drop of a diode when the external battery is used.
CONSTITUTION: When no external battery is inserted into the external battery jack 3, a switch 2 is on and the electric power of an internal battery coupled with a jack 4 is supplied to a voltage comparator 14 through a fuse 16, switch 2, Zener diode 7, and voltage dividing resistances 8, 9, and 10. When the external battery is inserted, on the other hand,the switch 2 is off and the voltage of the external battery power source is decreased by about 0.4V through a Schottky barrier 6 and connected in parallel to the internal battery. At this time, a switch 1 turns off, so a voltage divided by the resistances 8 and 9 is inputted to the comparator 14 and the voltage difference from a reference voltage is supplied to a light emitting diode 19 through a transistor 20.
COPYRIGHT: (C)1986,JPO&Japio
JP59262706A 1984-12-14 1984-12-14 Battery warning circuit Pending JPS61140879A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59262706A JPS61140879A (en) 1984-12-14 1984-12-14 Battery warning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59262706A JPS61140879A (en) 1984-12-14 1984-12-14 Battery warning circuit

Publications (1)

Publication Number Publication Date
JPS61140879A true JPS61140879A (en) 1986-06-27

Family

ID=17379460

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59262706A Pending JPS61140879A (en) 1984-12-14 1984-12-14 Battery warning circuit

Country Status (1)

Country Link
JP (1) JPS61140879A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104849663A (en) * 2014-02-15 2015-08-19 岳景睿 Circuit for detecting battery level

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104849663A (en) * 2014-02-15 2015-08-19 岳景睿 Circuit for detecting battery level

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