JPS5580133A - Power failure detection circuit - Google Patents
Power failure detection circuitInfo
- Publication number
- JPS5580133A JPS5580133A JP15562178A JP15562178A JPS5580133A JP S5580133 A JPS5580133 A JP S5580133A JP 15562178 A JP15562178 A JP 15562178A JP 15562178 A JP15562178 A JP 15562178A JP S5580133 A JPS5580133 A JP S5580133A
- Authority
- JP
- Japan
- Prior art keywords
- mcon
- power
- detection circuit
- voltage
- circuit
- 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
Links
Landscapes
- Electronic Switches (AREA)
Abstract
PURPOSE: To execute a program normally all the time by initializing a computer securely at adequate time after power is turned OFF in case of a momentary power failure or power break of a controller using a one-chip microcomputer.
CONSTITUTION: Between the power input terminal of constant-volgate circuit PS supplying power to one-chip microcomputer MCON and MCON, voltage detection circuit CCT1 is connected. This voltage detection circuit CCT1 absorbs variation in input to constant-voltage circuit PS and detects voltages across a rectifier circuit and smoothing circuit approximating to a regulation start voltage, and the output of voltage detection circuit CCT1 turns transistor TrQ4 ON to discharge capacitor C1. Then, a potential at terminal INIT of MCON is nearly equalized to voltage Vss within fixed time to obtain fixed characteristics as to a rise when power supply AC100V is turned ON, and MCON is initialized to executing a program in a normal state all the time.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15562178A JPS5580133A (en) | 1978-12-14 | 1978-12-14 | Power failure detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15562178A JPS5580133A (en) | 1978-12-14 | 1978-12-14 | Power failure detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5580133A true JPS5580133A (en) | 1980-06-17 |
JPS5651372B2 JPS5651372B2 (en) | 1981-12-04 |
Family
ID=15610000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15562178A Granted JPS5580133A (en) | 1978-12-14 | 1978-12-14 | Power failure detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5580133A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01216417A (en) * | 1988-02-24 | 1989-08-30 | Matsushita Electric Works Ltd | Reset circuit |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4817886U (en) * | 1971-07-10 | 1973-02-28 | ||
JPS4828807A (en) * | 1971-08-16 | 1973-04-17 | ||
JPS53106524A (en) * | 1977-03-01 | 1978-09-16 | Toshiba Corp | Initial clear unit for digital circuit |
-
1978
- 1978-12-14 JP JP15562178A patent/JPS5580133A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4817886U (en) * | 1971-07-10 | 1973-02-28 | ||
JPS4828807A (en) * | 1971-08-16 | 1973-04-17 | ||
JPS53106524A (en) * | 1977-03-01 | 1978-09-16 | Toshiba Corp | Initial clear unit for digital circuit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01216417A (en) * | 1988-02-24 | 1989-08-30 | Matsushita Electric Works Ltd | Reset circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS5651372B2 (en) | 1981-12-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4563733A (en) | Startup circuit for a switched power supply | |
JPS54106832A (en) | Operation control method for a/d converter | |
TW201334384A (en) | Integrated circuit device with integrated voltage controller | |
JPS56122526A (en) | Semiconductor integrated circuit | |
JPS5537610A (en) | Microcomputer reset circuit | |
JPS5580133A (en) | Power failure detection circuit | |
JPS57130130A (en) | Power supply and stop delay circuit for microcomputer | |
JPS5679315A (en) | Constant-voltage power unit | |
JPS55116118A (en) | Reset circuit of microcomputer | |
JPS576916A (en) | Power supply device | |
JPS5635230A (en) | Power supply control system | |
JPS54121951A (en) | Ac-dc power circuit | |
JPS54134342A (en) | Captive generator control system | |
JPS5553182A (en) | Starting circuit for switching-mode power-supply circuit | |
JPS5743209A (en) | Regulated power supply | |
JPS5588412A (en) | Expansion circuit | |
JPS5734224A (en) | Power control circuit | |
JPS5799032A (en) | Alternating current two-wire type contactless switch | |
SU436338A1 (en) | DEVICE FOR STABILIZATION OF VOLTAGE | |
KR200169682Y1 (en) | Instant-input overvoltage detector circuit of oscillator | |
JPS5710821A (en) | Constant voltage power supply circuit | |
JPS5533259A (en) | Proportional plus integral action type regulator | |
JPS5566135A (en) | Power unit of electronic counter | |
JPS5776615A (en) | Power source supply system of small-sized electronic equipment | |
JPS5619119A (en) | Direct current regulated power supply unit of multioutput |