CN200959511Y - Circuit with short-circuit protector - Google Patents
Circuit with short-circuit protector Download PDFInfo
- Publication number
- CN200959511Y CN200959511Y CN 200620014430 CN200620014430U CN200959511Y CN 200959511 Y CN200959511 Y CN 200959511Y CN 200620014430 CN200620014430 CN 200620014430 CN 200620014430 U CN200620014430 U CN 200620014430U CN 200959511 Y CN200959511 Y CN 200959511Y
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- China
- Prior art keywords
- resistance
- circuit
- voltage control
- diode
- control circuit
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- 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.)
- Expired - Lifetime
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Abstract
The utility model relates to a circuit used for short circuit protection of circuit, consisting of a load and a voltage control circuit device used for controlling electric current make-brake, and also consists of a diode which is used to prevent reverse conduction when the voltage control circuit device is disconnecting. The diode and the voltage control circuit device are parallel connection. The circuit used for short circuit protection of circuit of the utility model can improve the accuracy and correctness of the test point voltage, with simple and reasonable circuit arrangement, the circuit protected effectively and convenient selection of the resistance.
Description
Technical field
The utility model relates to the protection of subway shield door short circuit current, more particularly, relates to a kind of circuit that is used for the short circuit protection.
Background technology
Traditional subway shield door short circuit current protective circuit comprises load, MOSFET pipe and resistance R 3, R4, R5 as shown in Figure 1.The 2nd pin of MOSFET pipe is connected in the load (i.e. LOAD among the figure), ground connection after the 3rd pin is connected with resistance R 4.One of resistance R 5 is terminated at the 1st pin of MOSFET pipe, other end ground connection.One of resistance R 3 is terminated at the 1st pin of MOSFET pipe, and the other end is connected on control signal input (i.e. control_signal among the figure).The intermediate node C that the 3rd pin of MOSFET pipe is connected with resistance R 4 is test point (i.e. test_point among the figure).The resistance of resistance R 3 is 680 ohm, and the resistance of resistance R 5 is 10K ohm, and the resistance of resistance R 4 is 20K ohm.
Foregoing circuit mainly is by gathering the 3rd pin electric current of MOSFET pipe U1, that is to say the 3rd pin of MOSFET pipe U1 directly resistance R 4 of serial connection carry out voltage measurement, thereby the conducting that reaches control MOSFET pipe U1 whether.But because the change in voltage of MOSFET pipe U1 the 3rd pin is too little, output current is too big, only needs the resistance of resistance R 4 of serial connection little, as milliohm level resistance, therefore is not easy to the type selecting of resistance, and the accuracy of the test value that obtains and accuracy are not good enough.
The utility model content
The technical problems to be solved in the utility model is, at the above-mentioned defective of being convenient to the resistance type selecting of prior art, provides a kind of circuit that is used for the short circuit protection, can improve the accuracy and the accuracy of circuit test access point.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of circuit that is used for the short circuit protection; comprise load and be used for the voltage control circuit device U1 of Control current break-make; also comprise the diode D1 that prevents reverse-conducting when described voltage control circuit device U1 disconnects, described diode D1 and described voltage control circuit device U1 are connected in parallel.
In the utility model, also comprise first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5,
The 1st pin of described voltage control circuit device U1 is connected with the 5th resistance R 5 with the 3rd resistance R 3 respectively, and the 2nd pin is connected with the negative electrode of described load with described diode D1 respectively, the 3rd pin ground connection; The other end of described the 3rd resistance R 3 is connected to signal input end; The other end of described the 5th resistance R 5 is with an end ground connection of described the 4th resistance R 4;
One of described first resistance R 1 is terminated at the anode of described diode D1, and the other end is connected to signal input end;
One of described second resistance R 2 is terminated at the intermediate node A of described first resistance R 1 and described diode D1 series connection, ground connection after the other end is connected with described the 4th resistance R 4;
In the utility model, the intermediate node B of described second resistance R 2 and 4 series connection of described the 4th resistance R is a test node.
In the utility model, the resistance of described first resistance R 1 and described the 5th resistance R 5 is 10K ohm, and the resistance of described second resistance R 2 and described the 3rd resistance R 3 is 680 ohm, and the resistance of described the 4th resistance R 4 is 20K ohm.
In the utility model, described voltage control circuit device U1 is the MOSFET pipe.
Implement the circuit that is used for short circuit protection of the present utility model, can improve the accuracy and the accuracy of test point voltage, and circuit is provided with advantages of simple, protective circuit effectively also is convenient to the type selecting of resistance.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is traditional circuit diagram that is used for the short circuit protection;
Fig. 2 is the circuit diagram that is used for the short circuit protection of the present utility model.
Embodiment
As shown in Figure 2, the utility model circuit of being used for short circuit protection comprise load LOAD, be used for the voltage control circuit device (calling the MOSFET pipe in the following text) of Control current break-make and when MOSFET pipe U1 disconnection, prevent reverse-conducting and with load output diode connected in parallel D1.
Wherein, the 2nd pin of MOSFET pipe U1 is connected with the negative electrode of load LOAD input and diode D1 respectively, and the 1st pin of MOSFET pipe is connected with the 5th resistance R 5 with the 3rd resistance R 3 respectively, the 3rd pin ground connection of MOSFET pipe U1.
In above-mentioned, also comprise first resistance R 1, second resistance R 2 and the 4th resistance R 4.One of first resistance R 1 is terminated at the anode of diode D1, and the other end is connected to signal input end (i.e. control signal among the figure); One of second resistance R 2 is terminated at the intermediate node A of first resistance R 1 and diode D1 series connection, ground connection after the other end is connected with the 4th resistance R 4; The other end of the 3rd resistance R 3 is connected to signal input end; The other end of the 5th resistance R 5 is with the 4th resistance R 4 ground connection.
Wherein, the intermediate node B that connects with the 4th resistance R 4 of second resistance R 2 is test point (i.e. test point among the figure)
In the present embodiment, the resistance of first resistance R 1 and the 5th resistance R 5 is 10K ohm, and the resistance of second resistance R 2 and the 3rd resistance R 3 is 680 ohm, and the resistance of the 4th resistance R 4 is 20K ohm.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (5)
1, a kind of circuit that is used for the short circuit protection; comprise load and be used for the voltage control circuit device (U1) of Control current break-make; it is characterized in that; also comprise the diode (D1) that prevents reverse-conducting when described voltage control circuit device (U1) disconnects, described diode (D1) is connected in parallel with described voltage control circuit device (U1).
2, circuit according to claim 1 is characterized in that, comprises first resistance (R1), second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) and the 5th resistance (R5);
The 1st pin of described voltage control circuit device (U1) is connected with the 5th resistance (R5) with the 3rd resistance (R3) respectively, and the 2nd pin is connected with the negative electrode of described load with described diode (D1) respectively, the 3rd pin ground connection; The other end of described the 3rd resistance (R3) is connected to signal input end; The other end of described the 5th resistance (R5) is with an end ground connection of described the 4th resistance (R4);
One of described first resistance (R1) is terminated at the anode of described diode (D1), and the other end is connected to signal input end;
One of described second resistance (R2) is terminated at the intermediate node (A) of described first resistance (R1) and described diode (D1) series connection, ground connection after the other end is connected with described the 4th resistance (R4).
3, circuit according to claim 2 is characterized in that, the intermediate node (B) of described second resistance (R2) and described the 4th resistance (R4) series connection is a test node.
4, circuit according to claim 3, it is characterized in that, the resistance of described first resistance (R1) and described the 5th resistance (R5) is 10K ohm, the resistance of described second resistance (R2) and described the 3rd resistance (R3) is 680 ohm, and the resistance of described the 4th resistance (R4) is 20K ohm.
5, circuit according to claim 1 is characterized in that, described voltage control circuit device (U1) is the MOSFET pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620014430 CN200959511Y (en) | 2006-08-30 | 2006-08-30 | Circuit with short-circuit protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620014430 CN200959511Y (en) | 2006-08-30 | 2006-08-30 | Circuit with short-circuit protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200959511Y true CN200959511Y (en) | 2007-10-10 |
Family
ID=38786391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620014430 Expired - Lifetime CN200959511Y (en) | 2006-08-30 | 2006-08-30 | Circuit with short-circuit protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200959511Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107194107A (en) * | 2017-06-12 | 2017-09-22 | 郑州云海信息技术有限公司 | A kind of method of improvement MOSFET ringing supply efficiency |
| TWI832310B (en) * | 2022-06-29 | 2024-02-11 | 力拓半導體股份有限公司 | A short-circuit protection circuitry |
-
2006
- 2006-08-30 CN CN 200620014430 patent/CN200959511Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107194107A (en) * | 2017-06-12 | 2017-09-22 | 郑州云海信息技术有限公司 | A kind of method of improvement MOSFET ringing supply efficiency |
| TWI832310B (en) * | 2022-06-29 | 2024-02-11 | 力拓半導體股份有限公司 | A short-circuit protection circuitry |
| US12068742B2 (en) | 2022-06-29 | 2024-08-20 | Leap Semiconductor Corp. | Short-circuit protection circuitry |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN FANGDA AUTOMATION SYSTEM CO., LTD. Free format text: FORMER OWNER: FANGDA GROUP CO., LTD. Effective date: 20101115 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 518055 FANGDA INDUSTRY CITY, LONGJING, XILI TOWN, NANSHAN DISTRICT, SHENZHEN CITY, GUANGDONG PROVINCE TO: 518055 FANGDA CITY, LONGJING, XILI, NANSHAN DISTRICT, SHENZHEN CITY, GUANGDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20101115 Address after: 518055 Guangdong city of Shenzhen province Nanshan District Xili, Longjing Fangda Patentee after: Shenzhen Fangda Automation System Co., Ltd. Address before: 518055 Guangdong city of Shenzhen province Nanshan District Xili Town, Longjing Fangda industrial city Patentee before: Fangda Group Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20071010 |
|
| EXPY | Termination of patent right or utility model |