JPS55144772A - Step-down circuit - Google Patents

Step-down circuit

Info

Publication number
JPS55144772A
JPS55144772A JP5181179A JP5181179A JPS55144772A JP S55144772 A JPS55144772 A JP S55144772A JP 5181179 A JP5181179 A JP 5181179A JP 5181179 A JP5181179 A JP 5181179A JP S55144772 A JPS55144772 A JP S55144772A
Authority
JP
Japan
Prior art keywords
circuit
voltage
oscillation circuit
switching element
driven
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
JP5181179A
Other languages
Japanese (ja)
Other versions
JPS6147067B2 (en
Inventor
Hiroshi Yoshino
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.)
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Original Assignee
Tokyo Sanyo Electric Co Ltd
Sanyo Electric 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 Tokyo Sanyo Electric Co Ltd, Sanyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP5181179A priority Critical patent/JPS55144772A/en
Publication of JPS55144772A publication Critical patent/JPS55144772A/en
Publication of JPS6147067B2 publication Critical patent/JPS6147067B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces

Abstract

PURPOSE:To extremely minimize power consumption and to prolong the life of electronic watches, etc. by providing a switching element across the power source of the circuit driven by the stepped-down voltage and a cell voltage wherein the switching element is kept in off conditions after starting an oscillation circuit. CONSTITUTION:A series-parallel connection of capacitors 13, 14 is switched by the control signals phi1, phi2 from an oscillation circuit 6 or a frequency dividing circuit 7 and a step-down voltage from the voltage V ss1 of a lithium cell 15 is done. And the oscillation circuit 6 and the circuit 7 are driven by the voltage Vss2 stepped down to 1/2, for example, and a watch circuit 8 including a liquid crystal display unit is driven by the cell voltage Vss1. A switching element 16 such as N-MOS is provided across the stepped down power source Vss2 and the cell voltage Vss1 in such a circuit, and control is done by a flip-flop 17 etc. so that off conditions may be kept after starting the oscillation circuit 6. By doing this, power consumption will extremely be minimized and the life of the electronic watches etc. using lithium cells will be prolonged.
JP5181179A 1979-04-26 1979-04-26 Step-down circuit Granted JPS55144772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5181179A JPS55144772A (en) 1979-04-26 1979-04-26 Step-down circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5181179A JPS55144772A (en) 1979-04-26 1979-04-26 Step-down circuit

Publications (2)

Publication Number Publication Date
JPS55144772A true JPS55144772A (en) 1980-11-11
JPS6147067B2 JPS6147067B2 (en) 1986-10-17

Family

ID=12897287

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5181179A Granted JPS55144772A (en) 1979-04-26 1979-04-26 Step-down circuit

Country Status (1)

Country Link
JP (1) JPS55144772A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075129A2 (en) * 1981-08-27 1983-03-30 Kabushiki Kaisha Toshiba Voltage dropping or voltage increasing electronic circuit
US4433282A (en) * 1981-12-08 1984-02-21 Intersil Monolithic voltage divider
DE4007953A1 (en) * 1990-03-09 1991-09-19 Sumitomo Metal Ind DC=DC converter using switched capacitors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075129A2 (en) * 1981-08-27 1983-03-30 Kabushiki Kaisha Toshiba Voltage dropping or voltage increasing electronic circuit
US4433282A (en) * 1981-12-08 1984-02-21 Intersil Monolithic voltage divider
DE4007953A1 (en) * 1990-03-09 1991-09-19 Sumitomo Metal Ind DC=DC converter using switched capacitors

Also Published As

Publication number Publication date
JPS6147067B2 (en) 1986-10-17

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