JPS6454520A - Power source control circuit - Google Patents

Power source control circuit

Info

Publication number
JPS6454520A
JPS6454520A JP62211085A JP21108587A JPS6454520A JP S6454520 A JPS6454520 A JP S6454520A JP 62211085 A JP62211085 A JP 62211085A JP 21108587 A JP21108587 A JP 21108587A JP S6454520 A JPS6454520 A JP S6454520A
Authority
JP
Japan
Prior art keywords
circuit
power source
quickly
charge
power supply
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
JP62211085A
Other languages
Japanese (ja)
Other versions
JP2701266B2 (en
Inventor
Yasutoshi Takizawa
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 JP62211085A priority Critical patent/JP2701266B2/en
Publication of JPS6454520A publication Critical patent/JPS6454520A/en
Application granted granted Critical
Publication of JP2701266B2 publication Critical patent/JP2701266B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To stabilize a power supply voltage of a circuit system for always supplying a power source, and to prevent a malfunction by providing a switching means for discharging quickly a charge which has been charged to a bypass capacitor, when a power supply from a power source circuit is turned off. CONSTITUTION:When an operation of a circuit shown in the figure is ended and its operating state is shifted to a non-operating state, first of all, a control circuit CONT sets an output signal PON to an H level and stops an operation of a power source circuit PS. Thereafter, when an output signal DIS is set to an L level, transistors Q1, Q2 conduct and a charge which has been charged to a bypass use capacitor C is discharged quickly. As a result, an output VDD of the circuit PS becomes 0V quickly, therefore, since the time when a through- current flows to a circuit system BU becomes extremely short, a power supply voltage VBK does not drop and the system operates stably. Unless the switching means Q1, Q2 and R discharge quickly the charge of the capacitor C, the output VDD drops as shown with a broken line, therefore, the through-current flows for many hours, and as a result, the voltage VBK drops and a malfunction of the system BU is caused.
JP62211085A 1987-08-25 1987-08-25 Electronics Expired - Lifetime JP2701266B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62211085A JP2701266B2 (en) 1987-08-25 1987-08-25 Electronics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62211085A JP2701266B2 (en) 1987-08-25 1987-08-25 Electronics

Publications (2)

Publication Number Publication Date
JPS6454520A true JPS6454520A (en) 1989-03-02
JP2701266B2 JP2701266B2 (en) 1998-01-21

Family

ID=16600169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62211085A Expired - Lifetime JP2701266B2 (en) 1987-08-25 1987-08-25 Electronics

Country Status (1)

Country Link
JP (1) JP2701266B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0415369U (en) * 1990-05-28 1992-02-07

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572219A (en) * 1978-11-27 1980-05-30 Mitsubishi Electric Corp Power circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572219A (en) * 1978-11-27 1980-05-30 Mitsubishi Electric Corp Power circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0415369U (en) * 1990-05-28 1992-02-07

Also Published As

Publication number Publication date
JP2701266B2 (en) 1998-01-21

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term