JPH0361596U - - Google Patents
Info
- Publication number
- JPH0361596U JPH0361596U JP12338789U JP12338789U JPH0361596U JP H0361596 U JPH0361596 U JP H0361596U JP 12338789 U JP12338789 U JP 12338789U JP 12338789 U JP12338789 U JP 12338789U JP H0361596 U JPH0361596 U JP H0361596U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- power
- circuit board
- transistor
- supply control
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Electric Clocks (AREA)
- Electronic Switches (AREA)
Description
第１図は本考案によるタイマー付電子機器の電
源供給回路を示す回路図、第２図は従来のタイマ
ー付電子機器における電源供給回路を示す回路図
である。
２……メイン電源（第１の電源）、３……タイ
マー用ＩＣ（電源制御回路）、４……タイマー電
源（第２の電源）、ＴＲ１……メイン電源制御ト
ランジスタ、ＴＲ２……タイマー電源検出トラン
ジスタ。
FIG. 1 is a circuit diagram showing a power supply circuit of an electronic device with a timer according to the present invention, and FIG. 2 is a circuit diagram showing a power supply circuit of a conventional electronic device with a timer. 2... Main power supply (first power supply), 3... Timer IC (power supply control circuit), 4... Timer power supply (second power supply), TR1... Main power supply control transistor, TR2... Timer power supply detection transistor.
Claims (1)
の電源と、 該第１の電源から前記主回路基板への電源供給
路中に設けられた電源制御トランジスタと、 該電源制御トランジスタを制御して前記第１の
電源から前記主回路基板への電源供給を制御する
電源制御回路と、 該電源制御回路へ電源を供給するための第２の
電源と、 該第２の電源電圧によつて導通する第２電源検
出トランジスタとを備え、 前記第２の電源電圧によつて第２電源検出トラ
ンジスタが導通状態の時には前記電源制御回路に
よつて第１の電源から主回路基板への電源供給を
制御し、第２の電源電圧が所定値より低くて第２
電源検出トランジスタが非導通状態にある時は前
記電源制御トランジスタを導通状態に維持して第
１の電源から前記主回路基板へ電源を供給するこ
とを特徴とするタイマー付電子機器の電源供給回
路。[Scope of claim for utility model registration]
a power supply control transistor provided in a power supply path from the first power supply to the main circuit board; and a power supply control transistor that controls the power supply control transistor to supply power from the first power supply to the main circuit board. a power supply control circuit for controlling supply; a second power supply for supplying power to the power supply control circuit; and a second power supply detection transistor conductive by the second power supply voltage; When the second power supply detection transistor is in a conductive state due to the power supply voltage, the power supply control circuit controls the power supply from the first power supply to the main circuit board, and when the second power supply voltage is lower than a predetermined value, 2
A power supply circuit for an electronic device with a timer, characterized in that when a power supply detection transistor is in a non-conductive state, the power supply control transistor is maintained in a conductive state to supply power from a first power supply to the main circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12338789U JPH0361596U (en) | 1989-10-20 | 1989-10-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12338789U JPH0361596U (en) | 1989-10-20 | 1989-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0361596U true JPH0361596U (en) | 1991-06-17 |
Family
ID=31671368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12338789U Pending JPH0361596U (en) | 1989-10-20 | 1989-10-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0361596U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006258995A (en) * | 2005-03-15 | 2006-09-28 | Fuji Xerox Co Ltd | Power unit for image display medium |
-
1989
- 1989-10-20 JP JP12338789U patent/JPH0361596U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006258995A (en) * | 2005-03-15 | 2006-09-28 | Fuji Xerox Co Ltd | Power unit for image display medium |
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