JPS6152439U - - Google Patents
Info
- Publication number
- JPS6152439U JPS6152439U JP13717684U JP13717684U JPS6152439U JP S6152439 U JPS6152439 U JP S6152439U JP 13717684 U JP13717684 U JP 13717684U JP 13717684 U JP13717684 U JP 13717684U JP S6152439 U JPS6152439 U JP S6152439U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- backup
- circuit
- output voltage
- main power
- 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
- Power Sources (AREA)
- Stand-By Power Supply Arrangements (AREA)
Description
第１図はこの考案の一実施例による電源回路の
回路構成図、第２図はこの考案の一実施例の動作
を説明するための電圧波形図、第３図は従来の電
源回路を示す回路構成図、第４図は従来のものの
動作を説明するための電圧波形図である。
２…ロジツク電源、３…イグニツシヨンスイツ
チ、４…バツクアツプ電源、５…電源切換回路、
７…バツテリ、１０…切換電圧検出回路、１１…
ＣＰＵ、１２…周辺回路。なお、図中、同一符号
は同一、または相当部分を示す。
Fig. 1 is a circuit configuration diagram of a power supply circuit according to an embodiment of this invention, Fig. 2 is a voltage waveform diagram for explaining the operation of an embodiment of this invention, and Fig. 3 is a circuit showing a conventional power supply circuit. The configuration diagram and FIG. 4 are voltage waveform diagrams for explaining the operation of the conventional device. 2...Logic power supply, 3...Ignition switch, 4...Backup power supply, 5...Power supply switching circuit,
7...Battery, 10...Switching voltage detection circuit, 11...
CPU, 12...peripheral circuits. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
る回路１１を含む電子回路の電源回路において、
常時バツクアツプ電圧を発生し該バツクアツプ電
圧を前記主電源２の非作動時に前記バツクアツプ
を必要とする回路１１に供給するバツクアツプ電
源４と、前記主電源２の出力電圧と前記バツクア
ツプ電源４の出力電圧とを比較し前者が後者を上
まわつたか否かを検出する切換電圧検出回路１０
と、該切換電圧検出回路１０により前記主電源２
の出力電圧が前記バツクアツプ電源４の出力電圧
を上まわつたときに切換制御され、前記バツクア
ツプを必要とする回路１１に対して前記バツクア
ツプ電源４の出力電圧に代えて前記主電源２の出
力電圧を供給する電源切換回路５とを備えたこと
を特徴とする電源回路。 In a power supply circuit for an electronic circuit including a circuit 11 that requires backup when the main power supply 2 is not in operation,
A backup power supply 4 that constantly generates a backup voltage and supplies the backup voltage to the circuit 11 that requires the backup when the main power supply 2 is not in operation, and an output voltage of the main power supply 2 and an output voltage of the backup power supply 4. A switching voltage detection circuit 10 that compares and detects whether the former exceeds the latter.
, the main power supply 2 is detected by the switching voltage detection circuit 10.
When the output voltage of the main power supply 4 exceeds the output voltage of the backup power supply 4, the switching control is performed, and the output voltage of the main power supply 2 is applied to the circuit 11 that requires the backup instead of the output voltage of the backup power supply 4. A power supply circuit characterized by comprising a power supply switching circuit 5 that supplies power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984137176U JPH069553Y2 (en) | 1984-09-12 | 1984-09-12 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984137176U JPH069553Y2 (en) | 1984-09-12 | 1984-09-12 | Power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6152439U true JPS6152439U (en) | 1986-04-09 |
| JPH069553Y2 JPH069553Y2 (en) | 1994-03-09 |
Family
ID=30695590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984137176U Expired - Lifetime JPH069553Y2 (en) | 1984-09-12 | 1984-09-12 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH069553Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002118685A (en) * | 2000-08-04 | 2002-04-19 | Matsushita Electric Ind Co Ltd | Emergency call system terminal equipment and emergency call system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5535882U (en) * | 1978-08-31 | 1980-03-07 | ||
| JPS57211946A (en) * | 1981-06-23 | 1982-12-25 | Mitsubishi Electric Corp | Backup power source for vehicle |
-
1984
- 1984-09-12 JP JP1984137176U patent/JPH069553Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5535882U (en) * | 1978-08-31 | 1980-03-07 | ||
| JPS57211946A (en) * | 1981-06-23 | 1982-12-25 | Mitsubishi Electric Corp | Backup power source for vehicle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002118685A (en) * | 2000-08-04 | 2002-04-19 | Matsushita Electric Ind Co Ltd | Emergency call system terminal equipment and emergency call system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH069553Y2 (en) | 1994-03-09 |