JPS5576418A - Power supply system for small-size electronic apparatus - Google Patents

Power supply system for small-size electronic apparatus

Info

Publication number
JPS5576418A
JPS5576418A JP14998478A JP14998478A JPS5576418A JP S5576418 A JPS5576418 A JP S5576418A JP 14998478 A JP14998478 A JP 14998478A JP 14998478 A JP14998478 A JP 14998478A JP S5576418 A JPS5576418 A JP S5576418A
Authority
JP
Japan
Prior art keywords
voltage
driven
circuit
supplied
oscillator
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
JP14998478A
Other languages
Japanese (ja)
Other versions
JPS6117010B2 (en
Inventor
Kazufumi Usui
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.)
Casio Computer Co Ltd
Original Assignee
Casio Computer Co 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 Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP14998478A priority Critical patent/JPS5576418A/en
Publication of JPS5576418A publication Critical patent/JPS5576418A/en
Publication of JPS6117010B2 publication Critical patent/JPS6117010B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Dc-Dc Converters (AREA)
  • Power Sources (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

PURPOSE: To preserve the steady operation of the load even in case the battery voltage drops by forming the voltage reduction means for the battery power source with the 1st means consisting of two units of capacitors plus the 2nd means comprising two units of resistances and then driving the load with the combination of both means.
CONSTITUTION: For the voltage reduction circuit of the battery power source which is used to the electronic watch unit, signal l features a low level when the illumination lamp is not driven. And battery voltage V1 is divided by capacitors 17 and 18, and voltage V3 and V4 of output terminals I and II are lowered down to 1/2V1 each to be supplied to the common signal generator circuit, the oscillator circuit, the logic circuit and others. While voltage V1 drops greatly when the lamp is driven. In that case, signal l features a high level, and voltage V4 given from terminal II is delivered in the form of voltage V1 to be supplied to the oscillator and logic circuits. Voltage V3 of terminal I is divided by resistances R1 and R2 down to 1/2V1 to be supplied to the common signal generator circuit. Accordingly, the oscillator and logic circuits can be driven with the voltage equal to the battery voltage when the lamp is driven, thus preventing the malfunction or the oscillation stop for the circuits.
COPYRIGHT: (C)1980,JPO&Japio
JP14998478A 1978-12-06 1978-12-06 Power supply system for small-size electronic apparatus Granted JPS5576418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14998478A JPS5576418A (en) 1978-12-06 1978-12-06 Power supply system for small-size electronic apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14998478A JPS5576418A (en) 1978-12-06 1978-12-06 Power supply system for small-size electronic apparatus

Publications (2)

Publication Number Publication Date
JPS5576418A true JPS5576418A (en) 1980-06-09
JPS6117010B2 JPS6117010B2 (en) 1986-05-06

Family

ID=15486917

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14998478A Granted JPS5576418A (en) 1978-12-06 1978-12-06 Power supply system for small-size electronic apparatus

Country Status (1)

Country Link
JP (1) JPS5576418A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5731333A (en) * 1980-07-31 1982-02-19 Suwa Seikosha Kk Power source circuit system
US7376848B2 (en) 1997-06-27 2008-05-20 Broadcom Corporation Battery powered device with dynamic power and performance management

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5731333A (en) * 1980-07-31 1982-02-19 Suwa Seikosha Kk Power source circuit system
US7376848B2 (en) 1997-06-27 2008-05-20 Broadcom Corporation Battery powered device with dynamic power and performance management
US7900067B2 (en) 1997-06-27 2011-03-01 Broadcom Corporation Battery powered device with dynamic and performance management
US8504852B2 (en) 1997-06-27 2013-08-06 Broadcom Corporation Battery powered device with dynamic power and performance management

Also Published As

Publication number Publication date
JPS6117010B2 (en) 1986-05-06

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