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JPS5679984A - Power supply system of electronic watch - Google Patents

Power supply system of electronic watch

Info

Publication number
JPS5679984A
JPS5679984A JP15791379A JP15791379A JPS5679984A JP S5679984 A JPS5679984 A JP S5679984A JP 15791379 A JP15791379 A JP 15791379A JP 15791379 A JP15791379 A JP 15791379A JP S5679984 A JPS5679984 A JP S5679984A
Authority
JP
Japan
Prior art keywords
voltage
circuit
output
battery
driving
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
JP15791379A
Other languages
Japanese (ja)
Inventor
Yoshibumi Yamao
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 JP15791379A priority Critical patent/JPS5679984A/en
Publication of JPS5679984A publication Critical patent/JPS5679984A/en
Pending legal-status Critical Current

Links

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  • Electromechanical Clocks (AREA)
  • Dc-Dc Converters (AREA)

Abstract

PURPOSE: To prevent malfunction of an electronic circuit owing to the voltage drop caused by driving a heavy load such as a lighting lamp from occuring by supplying the output voltage of a battery as a driving voltage to the electronic circuit by way of a constant-voltage circuit.
CONSTITUTION: The output voltage VSS of a battery 1 is applied to an electronic circuit 4 through a channel MOS transistor of which the resistance between the drain and source is changed by the output of a reference voltage output circuit 22 formed of an N channel MOS transistor. In addition, in a voltage lowering circuit 3, the voltage of 1/2 the battery voltage is made and the voltages of 3-value levels, VSS, 1/2VSS, 0 are supplied to a liquid crystal driving circuit 5 which in turn dynamically drives a liquid crystal display part 6.
COPYRIGHT: (C)1981,JPO&Japio
JP15791379A 1979-12-05 1979-12-05 Power supply system of electronic watch Pending JPS5679984A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15791379A JPS5679984A (en) 1979-12-05 1979-12-05 Power supply system of electronic watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15791379A JPS5679984A (en) 1979-12-05 1979-12-05 Power supply system of electronic watch

Publications (1)

Publication Number Publication Date
JPS5679984A true JPS5679984A (en) 1981-06-30

Family

ID=15660183

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15791379A Pending JPS5679984A (en) 1979-12-05 1979-12-05 Power supply system of electronic watch

Country Status (1)

Country Link
JP (1) JPS5679984A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01119231A (en) * 1988-09-19 1989-05-11 Kyushu Hitachi Maxell Ltd Automatic blood pressure monitor power circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS533864A (en) * 1976-06-30 1978-01-13 Seiko Instr & Electronics Ltd Electronic watch

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS533864A (en) * 1976-06-30 1978-01-13 Seiko Instr & Electronics Ltd Electronic watch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01119231A (en) * 1988-09-19 1989-05-11 Kyushu Hitachi Maxell Ltd Automatic blood pressure monitor power circuit

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