CN201122941Y - Switching value output circuit with overflowing protection function - Google Patents
Switching value output circuit with overflowing protection function Download PDFInfo
- Publication number
- CN201122941Y CN201122941Y CNU2007200160097U CN200720016009U CN201122941Y CN 201122941 Y CN201122941 Y CN 201122941Y CN U2007200160097 U CNU2007200160097 U CN U2007200160097U CN 200720016009 U CN200720016009 U CN 200720016009U CN 201122941 Y CN201122941 Y CN 201122941Y
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- CN
- China
- Prior art keywords
- switching value
- value output
- output circuit
- overcurrent protection
- overcurrent
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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 - Fee Related
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Abstract
The utility model relates to a switching value output circuit with overcurrent protection function. The switching value output circuit is composed of an overcurrent detection device (R5), an overcurrent protection cut-off device (T1), a switching value output decvice (M1), an input controlling device and an output fault feedback device. The input controlling device controls the make-and-break of the switching value output device, and the overcurrent protection cut-off device determines the cut-off of the switching value output device and the output of fault signals according to the voltage signals corresponded to the magnitude of the current generated by the overcurrent detection device. The switching value output circuit is characterized in that the structure is novel, the circuit is simple, applicable and reliable, the switching value output circuit can meet the requirement of the industrial on-site control, and therefore the switching value output circuit belongs to a novel switching value output circuit with overcurrent protection function combining the economical efficiency and the utility into a whole.
Description
Technical field
Switching value output circuit with overcurrent protection function described in the utility model relates to the electric control circuit that industrial automation is controlled.
Background technology
The switching value output circuit is as a kind of basic output circuit, and its task is that the faint digital signal of computer or controller output is converted to the digital drive signals that can control production process.According to the difference of scene load,, can select for use different power amplifying devices to constitute different switching values and drive output channel as indicator light, relay, contactor, motor, valve etc.The overcurrent protection design of switching value output circuit is the important component part of switching value designing circuitry, the design of existing multiple comparative maturity at present.But it is very complicated that these designs have, and reliability is but not necessarily high; The employing that has is specially with the chip for driving of overcurrent protection function, so that cost is higher.At existing problem in the above-mentioned prior art, a kind of novel switching value output circuit of research and design with overcurrent protection function, existing problem is very necessary in the prior art thereby overcome.
Summary of the invention
In view of existing problem in the above-mentioned prior art; the purpose of this utility model is a kind of novel switching value output circuit with overcurrent protection function of research and design, thus problems such as the complex circuit, the reliability that solve existing design in the prior art are not high, the big cost height of investment.Switching value output circuit with overcurrent protection function described in the utility model is by overcurrent detecting device (R5), overcurrent protection cutoff device (T1), and switching value output device (M1), input control device and output fault feedback device are formed.Overcurrent detecting device (R5) is an accurate little resistance resistance, and it is connected between the source electrode of power supply and M1, and the current value that will flow through is converted into proportional magnitude of voltage.The size of resistance value is by switching value output device (M1) maximum and the decision of overcurrent protection cutoff device (T1) base stage threshold voltage of output current in normal operation.Overcurrent protection cutoff device (T1) is the positive-negative-positive triode, and its B utmost point and the E utmost point are connected in parallel on the two ends of R5, and the C utmost point links to each other by the grid of light lotus root and resistance and M1, and when the current value that flows through R5 was worth greater than protection, the T1 pipe was open-minded.Switching value output device M1 is a P channel mosfet pipe that allows big electric current to flow through.Under the effective condition of input control signal high level, M1 is open-minded, the high level signal of a big electric current of output.Input control device and output fault feedback device are control and feedback end, all adopt the light lotus root to isolate.
Switching value output circuit described in the utility model comprises overcurrent detecting device (R5), overcurrent protection cutoff device (T1), switching value output device (M1), input control device and output fault feedback device etc.The break-make of input control device control switch amount output device, that the overcurrent protection cutoff device produces according to overcurrent detecting device, with the size of current corresponding voltage signal, determine whether stopcock amount output device, and whether export fault-signal.
The utlity model has novel structure, circuit is simple, practical and reliable, can satisfy the advantages such as needs of industry spot control within the specific limits, it puts goods on the market in enormous quantities and will produce positive social benefit and remarkable economic efficiency.
Description of drawings
The utility model has an accompanying drawing, wherein
Accompanying drawing: the schematic diagram that 1, has the switching value output circuit of overcurrent protection function
Embodiment
Specific embodiment of the utility model as shown in drawings, M1 is the MOSFET of P raceway groove, as the switching value output device.It is open-minded under the effect of control signal, exports a switching value signal with certain power grade.
Control signal comes from control chip.It through a not gate negate after, enter the negative pole of the input light-emitting diode of light lotus root OT1, it is anodal to link to each other with positive supply by a current-limiting resistance.When the control signal of a high level was imported, the light lotus root was open-minded, and the current potential that A is ordered is dragged down, and through R3, the R4 dividing potential drop obtains the magnitude of voltage of this point by 24V voltage, and its value is lower than the source voltage of M1, the M1 conducting.The switching value circuit that the utility model relates to is just exported the high level signal of a big electric current.When input control signal when negative, light lotus root OT1 ends, A point links to each other with the 24V power supply by R4, the current potential that A is ordered draws the high level into 24V on also, M1 also ends, switching value circuit M1 is less than exporting.
Overcurrent detecting device (R5) is serially connected in the current path of output circuit, and when current value increased, the voltage on the R5 is linear growth also.When M1 opens, meet or exceed the protection value if flow through the electric current of R5, the magnitude of voltage of its generation also reaches the threshold voltage that triode T1 is opened.This moment T1 open-minded, the A point by on move near 24V, metal-oxide-semiconductor M1 ends, and burns because of overcurrent to prevent the output circuit element.
Output fault feedback device OT2 is serially connected between the C utmost point and A point of T1, and when the T1 conducting, OT2 is conducting also, exports a low level fault-signal.The fault feedback signal under normal circumstances is pulled to high level, and only could be put low under the situation of control signal high effectively (promptly allowing output).
When the fault feedback signal put low after, the prime control circuit should be put the control signal input low at once.Because the switching value circuit that relates at the utility model, from simple practical angle, do not design complex failure latch with fault after the self-recovering function of delaying time.T1 is of short duration shutoff M1 when over current fault takes place, and when electric current reduced, T1 made M1 recover conducting at once.
The switching value output circuit with overcurrent protection function that the utility model is related is simple, practical and reliable, can satisfy the needs of industry spot control within the specific limits.
Claims (1)
1, a kind of switching value output circuit with overcurrent protection function is made up of overcurrent detecting device (R5), overcurrent protection cutoff device (T1), switching value output device (M1), input control device and output fault feedback device; It is characterized in that overcurrent detecting device (R5) is an accurate little resistance resistance, it is connected between the source electrode of power supply and M1, and the current value that will flow through is converted into proportional magnitude of voltage; Overcurrent protection cutoff device (T1) is the positive-negative-positive triode, and its B utmost point and the E utmost point are connected in parallel on the two ends of R5, and the C utmost point links to each other by the grid of light lotus root and resistance and M1; Switching value output device M1 is a P channel mosfet pipe that allows big electric current to flow through; Input control device and output fault feedback device all adopt the light lotus root to isolate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200160097U CN201122941Y (en) | 2007-11-19 | 2007-11-19 | Switching value output circuit with overflowing protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200160097U CN201122941Y (en) | 2007-11-19 | 2007-11-19 | Switching value output circuit with overflowing protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201122941Y true CN201122941Y (en) | 2008-09-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200160097U Expired - Fee Related CN201122941Y (en) | 2007-11-19 | 2007-11-19 | Switching value output circuit with overflowing protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201122941Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102375426A (en) * | 2010-08-09 | 2012-03-14 | 深圳市合信自动化技术有限公司 | Controlling apparatus of digital quantity output of PLC and controlling method thereof |
| CN102570990A (en) * | 2010-12-29 | 2012-07-11 | 安凯(广州)微电子技术有限公司 | Overcurrent protection circuit of amplifier output stage |
| CN102970012A (en) * | 2012-11-22 | 2013-03-13 | 中国船舶重工集团公司第七一一研究所 | On-off output module with diagnosing function |
| CN104682333A (en) * | 2013-11-28 | 2015-06-03 | 北车大连电力牵引研发中心有限公司 | Switching value output protection device and system |
| CN104716623A (en) * | 2014-12-26 | 2015-06-17 | 康奋威科技（杭州）有限公司 | Fuse substitute control circuit |
| CN107039947A (en) * | 2017-05-15 | 2017-08-11 | 南京昶达新材料技术有限公司 | A kind of output circuit with short-circuit protection |
-
2007
- 2007-11-19 CN CNU2007200160097U patent/CN201122941Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102375426A (en) * | 2010-08-09 | 2012-03-14 | 深圳市合信自动化技术有限公司 | Controlling apparatus of digital quantity output of PLC and controlling method thereof |
| CN102375426B (en) * | 2010-08-09 | 2013-06-05 | 深圳市合信自动化技术有限公司 | Controlling apparatus of digital quantity output of PLC and controlling method thereof |
| CN102570990A (en) * | 2010-12-29 | 2012-07-11 | 安凯(广州)微电子技术有限公司 | Overcurrent protection circuit of amplifier output stage |
| CN102570990B (en) * | 2010-12-29 | 2014-09-17 | 安凯(广州)微电子技术有限公司 | Overcurrent protection circuit of amplifier output stage |
| CN102970012A (en) * | 2012-11-22 | 2013-03-13 | 中国船舶重工集团公司第七一一研究所 | On-off output module with diagnosing function |
| CN102970012B (en) * | 2012-11-22 | 2015-04-15 | 中国船舶重工集团公司第七一一研究所 | On-off output module with diagnosing function |
| CN104682333A (en) * | 2013-11-28 | 2015-06-03 | 北车大连电力牵引研发中心有限公司 | Switching value output protection device and system |
| CN104716623A (en) * | 2014-12-26 | 2015-06-17 | 康奋威科技（杭州）有限公司 | Fuse substitute control circuit |
| CN104716623B (en) * | 2014-12-26 | 2019-07-26 | 杭州康奋威科技股份有限公司 | A kind of substitution fuse control circuit |
| CN107039947A (en) * | 2017-05-15 | 2017-08-11 | 南京昶达新材料技术有限公司 | A kind of output circuit with short-circuit protection |
| CN107039947B (en) * | 2017-05-15 | 2019-02-26 | 南京昶达新材料技术有限公司 | A kind of output circuit with short-circuit protection |
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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: NORTH CHINA CO. Free format text: FORMER OWNER: XIE BUMING Effective date: 20080912 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080912 Address after: Beijing City, Fengtai District Fong City Park District building 15, zip code: 100076 Patentee after: China CNR Corporation Limited Address before: R & D center of Dalian Locomotive & Rolling Stock Co., Ltd., No. 51 middle The Strip, Shahekou District, Liaoning, Dalian 116022, China Patentee before: Xie Buming |
|
| ASS | Succession or assignment of patent right |
Owner name: CHINA CNR CORPORATION LIMITED DALIAN ELECTRIC TRAC Free format text: FORMER OWNER: NORTH CHINA CO. Effective date: 20090410 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090410 Address after: No. 51, middle The Strip, Shahekou District, Liaoning, Dalian Province, China: 116022 Patentee after: Dalian Electric Traction Research & Development Center of China North Locomotive Co., Ltd. Address before: Beijing City, Fengtai District Fong City Park District building 15, zip code: 100076 Patentee before: China CNR Corporation Limited |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080924 Termination date: 20111119 |