JPS6446729A - Power source circuit system - Google Patents

Power source circuit system

Info

Publication number
JPS6446729A
JPS6446729A JP63170061A JP17006188A JPS6446729A JP S6446729 A JPS6446729 A JP S6446729A JP 63170061 A JP63170061 A JP 63170061A JP 17006188 A JP17006188 A JP 17006188A JP S6446729 A JPS6446729 A JP S6446729A
Authority
JP
Japan
Prior art keywords
voltage
constant
vss2
vss1
vstb
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
JP63170061A
Other languages
Japanese (ja)
Inventor
Taku Yamazaki
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
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 Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP63170061A priority Critical patent/JPS6446729A/en
Publication of JPS6446729A publication Critical patent/JPS6446729A/en
Pending legal-status Critical Current

Links

Landscapes

  • Liquid Crystal Display Device Control (AREA)
  • Electric Clocks (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE:To supply a stable voltage by providing a constant-voltage circuit for outputting a constant-voltage as a first power supply voltage, and a boosting circuit for outputting a boosted voltage as a second power supply voltage. CONSTITUTION:A switch 4 is turned ON, an STB operates, a voltage VSTB which is stabilized to about 1.5V is outputted from the STB, switch 5 is turned ON, and a VSS1 system becomes a VSTB level. Subsequently, is switch 6 is turned OFF and a battery voltage is cut off from a VSS2 system. When ON/OFF of switches 7, 9, and ON/OFF of switches 8, 10 are interlocked and repeated alternately, a level of the VSS2 system is boosted to a voltage of two times the voltage of VSS1=VSTB. In this case, a control signal CL1 is a signal for switching whether the battery voltage is applied directly to the VSS2 system, or a voltage which is converted to a constant-voltage by operating a constant- voltage circuit is applied to the VSS1 system, and becomes the former application or the latter application by HIGH level or LOW level, respectively. In such a way, the constant-voltage circuit operates and a stable voltage is obtained, and oscillating, frequency dividing, and fundamental logic parts are operated.
JP63170061A 1988-07-08 1988-07-08 Power source circuit system Pending JPS6446729A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63170061A JPS6446729A (en) 1988-07-08 1988-07-08 Power source circuit system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63170061A JPS6446729A (en) 1988-07-08 1988-07-08 Power source circuit system

Publications (1)

Publication Number Publication Date
JPS6446729A true JPS6446729A (en) 1989-02-21

Family

ID=15897904

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63170061A Pending JPS6446729A (en) 1988-07-08 1988-07-08 Power source circuit system

Country Status (1)

Country Link
JP (1) JPS6446729A (en)

Citations (1)

* 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

Patent Citations (1)

* 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

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