JPS63119210U - - Google Patents
Info
- Publication number
- JPS63119210U JPS63119210U JP1127087U JP1127087U JPS63119210U JP S63119210 U JPS63119210 U JP S63119210U JP 1127087 U JP1127087 U JP 1127087U JP 1127087 U JP1127087 U JP 1127087U JP S63119210 U JPS63119210 U JP S63119210U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- turned
- solenoid
- power supply
- drive 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
Landscapes
- Protection Of Static Devices (AREA)
Description
第１図はこの考案の一実施例を適用したソレノ
イド駆動回路の要部を示す図、第２図はこの駆動
回路の高電圧電源の電圧が低下している場合にお
いてソレノイドに印加される電圧の変化を示す図
、第３図は従来のソレノイド駆動回路の一例を示
す図、第４図はこの従来の駆動回路でソレノイド
に印加される電圧の変化を示す図である。
１２……駆動信号、１４……コンパレータ、１
５〜１７……トランジスタ、１８……高電圧電源
、１９……ソレノイド、２０……電流検知用抵抗
、２２……基準電圧設定用電源、２３……低電圧
電源、２４〜２６……ダイオード、３１……単安
定マルチバイブレータ、３２……フリツプフロツ
プ、３３……アンド回路、３４……ナンド回路、
３５，３６……異常電流検知用抵抗、３７〜４０
……トランジスタ。
Fig. 1 shows the main parts of a solenoid drive circuit to which an embodiment of this invention is applied, and Fig. 2 shows the voltage applied to the solenoid when the voltage of the high voltage power supply of this drive circuit is reduced. FIG. 3 is a diagram showing an example of a conventional solenoid drive circuit, and FIG. 4 is a diagram showing changes in the voltage applied to the solenoid in this conventional drive circuit. 12... Drive signal, 14... Comparator, 1
5 to 17... Transistor, 18... High voltage power supply, 19... Solenoid, 20... Current detection resistor, 22... Reference voltage setting power supply, 23... Low voltage power supply, 24 to 26... Diode, 31... Monostable multivibrator, 32... Flip-flop, 33... AND circuit, 34... NAND circuit,
35, 36... Resistor for abnormal current detection, 37-40
...Transistor.
Claims (1)
１のトランジスタを介して高電圧をソレノイドに
印加し、ソレノイドのコイルに流れる電流が所定
値に達したら、これを電流検知手段で検知して第
１のトランジスタをオフにし、低電圧電源からオ
ンとなつている第２のトランジスタを介して駆動
保持用低電圧をソレノイドに印加するようにした
ソレノイド駆動回路において、第１のトランジス
タがオンとなつて一定の時間が経過しても電流検
知手段から第１のトランジスタをオフとするため
の信号が出力されないとき、第１のトランジスタ
をオフとする第１のトランジスタ制御手段を具備
することを特徴とするソレノイド駆動回路の保護
装置。 At the beginning of operation, a high voltage is applied to the solenoid via the first transistor which is turned on from the high voltage power supply, and when the current flowing through the coil of the solenoid reaches a predetermined value, this is detected by the current detection means and the first transistor is turned on. In a solenoid drive circuit in which a first transistor is turned off and a low voltage for maintaining drive is applied to a solenoid via a second transistor which is turned on from a low voltage power supply, when the first transistor is turned on. The present invention is characterized by comprising first transistor control means that turns off the first transistor when the current detection means does not output a signal for turning off the first transistor even after a certain period of time has elapsed. Protection device for solenoid drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1127087U JPS63119210U (en) | 1987-01-28 | 1987-01-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1127087U JPS63119210U (en) | 1987-01-28 | 1987-01-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63119210U true JPS63119210U (en) | 1988-08-02 |
Family
ID=30798331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1127087U Pending JPS63119210U (en) | 1987-01-28 | 1987-01-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63119210U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0422109A (en) * | 1990-05-17 | 1992-01-27 | Fuji Electric Co Ltd | Electromagnet device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61141130A (en) * | 1984-12-13 | 1986-06-28 | Nippon Precision Saakitsutsu Kk | Manufacture of semiconductor device |
-
1987
- 1987-01-28 JP JP1127087U patent/JPS63119210U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61141130A (en) * | 1984-12-13 | 1986-06-28 | Nippon Precision Saakitsutsu Kk | Manufacture of semiconductor device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0422109A (en) * | 1990-05-17 | 1992-01-27 | Fuji Electric Co Ltd | Electromagnet device |
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