JPH01173817U - - Google Patents
Info
- Publication number
- JPH01173817U JPH01173817U JP6223988U JP6223988U JPH01173817U JP H01173817 U JPH01173817 U JP H01173817U JP 6223988 U JP6223988 U JP 6223988U JP 6223988 U JP6223988 U JP 6223988U JP H01173817 U JPH01173817 U JP H01173817U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- system power
- microcomputer
- detection means
- main system
- 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
- 238000001514 detection method Methods 0.000 claims 3
- 230000002093 peripheral effect Effects 0.000 claims 2
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 238000009499 grossing Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Power Sources (AREA)
Description
第１図はこの考案の１実施例を示す回路図、第
２図はこの考案の他の実施例を示す回路図、第３
図はこの考案の更に拡張した実施例を示す回路図
、第４図は第１図の場合の動作を示すタイムチヤ
ート、第５図は第２図及び第３図の場合の動作を
示すタイムチヤートである。第６図は従来の実施
例を示す電源回路図である。
図において、１はメイン系電源、２はバツクア
ツプ系電源、３はバツテリー、４はイグニツシヨ
ンスイツチ、５は逆接防止用ダイオード、６は入
力平滑用静電容量、７は３端子レギユレータ、８
は出力平滑用静電容量、９はトランジスタ、１０
はメイン電源系用静電容量、１１は抵抗、１２は
インターフエイス回路、１３はマイクロコンピユ
ータＣＰＵ、１４は従来の電源回路のタイミング
制御回路、１４ａはこの考案の場合のタイミング
制御回路、１５はスピード信号入力端子、１６は
不揮発性ＲＯＭ、１７はメモリ保持用ＲＡＭ、１
８はドライバ用ＩＣ、１９は液晶表示器ＬＣＤ、
２０は電源制御信号ＳＭ、２１はダイオード、２
２は並列トランジスタ、２３は抵抗である。なお
、各図中同一符号は同一または相当部分を示す。
Figure 1 is a circuit diagram showing one embodiment of this invention, Figure 2 is a circuit diagram showing another embodiment of this invention, and Figure 3 is a circuit diagram showing another embodiment of this invention.
The figure is a circuit diagram showing a further expanded embodiment of this invention, Figure 4 is a time chart showing the operation in the case of Figure 1, and Figure 5 is a time chart showing the operation in the cases of Figures 2 and 3. It is. FIG. 6 is a power supply circuit diagram showing a conventional embodiment. In the figure, 1 is the main system power supply, 2 is the backup system power supply, 3 is the battery, 4 is the ignition switch, 5 is the reverse connection prevention diode, 6 is the input smoothing capacitance, 7 is the 3-terminal regulator, 8
is the output smoothing capacitance, 9 is the transistor, 10
is a capacitance for the main power supply system, 11 is a resistor, 12 is an interface circuit, 13 is a microcomputer CPU, 14 is a timing control circuit of a conventional power supply circuit, 14a is a timing control circuit in the case of this invention, and 15 is a speed Signal input terminal, 16 non-volatile ROM, 17 memory holding RAM, 1
8 is a driver IC, 19 is a liquid crystal display LCD,
20 is a power supply control signal SM, 21 is a diode, 2
2 is a parallel transistor, and 23 is a resistor. Note that the same reference numerals in each figure indicate the same or corresponding parts.
Claims (1)
バツクアツプ系電源２と、前記バツテリ３に接続
されたイグニツシヨンスイツチ４のＯＮ状態を検
出する検出手段１２と、前記バツクアツプ系電源
２に接続されて前記検出手段１２からの出力によ
つてＯＮ動作するスイツチ手段９と、該スイツチ
手段の出力側に接続されたメイン系電源１と、前
記バツクアツプ系電源２から常時給電され、入力
されたデータの処理を行うマイクロコンピユータ
１３と、前記メイン系電源１から給電されるマイ
クロコンピユータ周辺回路１４とを備え、前記ス
イツチ手段９が前記検出手段１２の出力でＯＮ動
作したとき前記メイン系電源１が作動状態になる
ことを特徴とするマイクロコンピユータの電源回
路。 A backup system power supply 2 which is supplied with power from a battery 3 and is always in operation; a detection means 12 which detects the ON state of an ignition switch 4 connected to the battery 3; The switch means 9 is turned ON by the output from the detection means 12, the main system power supply 1 connected to the output side of the switch means, and the backup system power supply 2 supply power at all times to process input data. A microcomputer peripheral circuit 14 is provided with a microcomputer 13 that performs the switching, and a microcomputer peripheral circuit 14 that is supplied with power from the main system power supply 1, and when the switch means 9 is turned on by the output of the detection means 12, the main system power supply 1 is activated. A power supply circuit for a microcomputer characterized by:
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988062239U JPH0726749Y2 (en) | 1988-05-13 | 1988-05-13 | Microcomputer power supply circuit |
| EP89106350A EP0340485B1 (en) | 1988-04-12 | 1989-04-11 | Control system for head-up display for automotive vehicles |
| DE68926799T DE68926799T2 (en) | 1988-04-12 | 1989-04-11 | Control system for head-up displays for motor vehicles |
| US07/337,134 US5202668A (en) | 1988-04-12 | 1989-04-12 | Control system for a head-up display for automotive vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988062239U JPH0726749Y2 (en) | 1988-05-13 | 1988-05-13 | Microcomputer power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01173817U true JPH01173817U (en) | 1989-12-11 |
| JPH0726749Y2 JPH0726749Y2 (en) | 1995-06-14 |
Family
ID=31287868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988062239U Expired - Lifetime JPH0726749Y2 (en) | 1988-04-12 | 1988-05-13 | Microcomputer power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0726749Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62156519U (en) * | 1986-03-28 | 1987-10-05 | ||
| JPWO2002030713A1 (en) * | 2000-10-06 | 2004-02-19 | 株式会社ザナヴィ・インフォマティクス | Automotive information equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60174439U (en) * | 1984-04-24 | 1985-11-19 | 富士通テン株式会社 | Power supply equipment for automotive control equipment |
| JPS62134136U (en) * | 1986-02-17 | 1987-08-24 |
-
1988
- 1988-05-13 JP JP1988062239U patent/JPH0726749Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60174439U (en) * | 1984-04-24 | 1985-11-19 | 富士通テン株式会社 | Power supply equipment for automotive control equipment |
| JPS62134136U (en) * | 1986-02-17 | 1987-08-24 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62156519U (en) * | 1986-03-28 | 1987-10-05 | ||
| JPWO2002030713A1 (en) * | 2000-10-06 | 2004-02-19 | 株式会社ザナヴィ・インフォマティクス | Automotive information equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0726749Y2 (en) | 1995-06-14 |
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