CN101350512A - Over current protective system - Google Patents
Over current protective system Download PDFInfo
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- CN101350512A CN101350512A CNA2007102011284A CN200710201128A CN101350512A CN 101350512 A CN101350512 A CN 101350512A CN A2007102011284 A CNA2007102011284 A CN A2007102011284A CN 200710201128 A CN200710201128 A CN 200710201128A CN 101350512 A CN101350512 A CN 101350512A
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Abstract
The present invention relates to an over-current protection system which comprises a signal sampling unit, a central processing unit and an output control unit. The input end of the signal sampling unit is connected with an external circuit, and is used for real-time detection of the current value of the external circuit; the maximum current value allowing the external circuit is preset in the central processing unit; the central processing unit is connected with the output end of the signal sampling unit, and is used for receiving the current value of the signal sampling circuit and judging whether the current value is the same as the maximum current value allowing the external circuit. The output control unit comprises a thyristor switch; the input end of the output control unit is connected with the central processing unit; the thyristor switch is connected within the external circuit. When the over-current situation occurs, the central processing unit can trigger the thyristor switch so as to cut off the external circuit. The thyristor switch is connected with the central processing unit, has the advantages of rapid reaction velocity and long service life, and thus can timely protect the equipment to be protected.
Description
Technical field
The present invention relates to a kind of Over Current Protection System, relate in particular to a kind of SCM Based Over Current Protection System.
Background technology
At present; at a lot of industrial equipments in the course of the work, because momentary load is overweight, cause electric current excessive and burn out; for example be applied in industry heating facility particularly in the thermoforming machine of eyeglass processing, if often easily the heater strip of thermoforming machine is burnt out when Over Current Protection System not being installed.
Summary of the invention
In view of this, be necessary to provide a kind of Over Current Protection System of protecting equipment work.
A kind of Over Current Protection System, it comprises signal sampling unit, CPU and output control unit.The input of this signal sampling unit links to each other with external circuit, and the current value of this external circuit of detecting real-time.Be preset with the lowest high-current value that allows external circuit in this CPU, this CPU links to each other with the output of this signal sampling unit, is used for the current value of received signal sample circuit and judges whether this current value is identical with the lowest high-current value that allows external circuit.This output control unit comprises reverse-blocking tetrode thyristor, the input of this output control unit links to each other with this CPU, this reverse-blocking tetrode thyristor accesses in the external circuit, when the current value of external circuit when allowing the lowest high-current value of external circuit, disconnect external circuit disconnected thereby this CPU triggers this reverse-blocking tetrode thyristor.
The output control circuit of described Over Current Protection System comprises the reverse-blocking tetrode thyristor that is connected on the CPU output, and the reverse-blocking tetrode thyristor reaction speed is fast, and long service life can in time be protected protected equipment.
Description of drawings
The module map of a kind of Over Current Protection System that Fig. 1 provides for the embodiment of the invention.
Fig. 2 is the circuit diagram of the signal sampling unit of the Over Current Protection System among Fig. 1.
Fig. 3 is the circuit diagram of the output control unit of the Over Current Protection System among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is described in further detail.
See also Fig. 1, first embodiment of the invention provides a kind of Over Current Protection System.This Over Current Protection System 100 comprises signal sampling unit 102, CPU 104, output control unit 106, display unit 108, alarm unit 110, memory cell 112, push-button unit 114 and power subsystem 116.In the present embodiment, the quantity of signal sampling unit 102 and output control unit 106 is one.
See also Fig. 2, this signal sampling unit 102 comprises front-end sampling circuit 1022, rectification circuit 1024 and signal amplification circuit 1026.This front-end sampling circuit 1022 comprises current transformer T2 (Current Transformer), and it is used to gather the ac signal of external circuit and exports the ac signal of gathering to this rectification circuit 1024.This rectification circuit 1024 comprises shunt resistance R21 and bridge rectifier B1.
This shunt resistance R21 is in parallel with this current transformer T2, and this current transformer T2 and this shunt resistance R21 all access among this bridge rectifier B1, and the output of bridge rectifier B1 is connected to this signal amplification circuit 1026.Rectification circuit 1024 is transformed into direct current with alternating current, and the direct current after the rectification inputs to this signal amplification circuit 1026.
This CPU 104 is a single-chip microcomputer.In the present embodiment, this single-chip microcomputer is a STC12C5410AD type single-chip microcomputer, and it has A/D converter and memory, by write software program set this monolithic processor controlled executive condition, to acquired signal identification, judgement, handle and send control command.Method of operation, interface type and the interface method etc. of this STC12C5410AD type single-chip microcomputer all can be referring to its descriptions of product.The output signal of the amplifier of these CPU 104 received signal sample circuits 102.Be provided with the maximum current of the protected equipment of permission that is set by the user in this CPU 104.
These output control unit 106 inputs link to each other with this CPU 104.See also Fig. 3, output control unit 106 is the SCR control circuit, and it comprises photoelectrical coupler U7, triac Q2, filter circuit 1062, and resistance R 25, R26 and current-limiting resistance R28.The input of this photoelectrical coupler U7 links to each other with the output of CPU 104 through current-limiting resistance R28, and photoelectrical coupler U7 is connected in parallel to this reverse-blocking tetrode thyristor Q2 and this filter circuit 1062 through resistance R 25 and R26 respectively.This reverse-blocking tetrode thyristor Q2 comprises grid; this grid is connected to the end of photoelectrical coupler U7; and the two ends of reverse-blocking tetrode thyristor Q2 access to respectively in the circuit (figure does not show) of protected equipment; the current value of judging external circuits when CPU 104 is when allowing the lowest high-current value of external circuit; be that overcurrent condition is when occurring; CPU 104 triggers this triac Q2 by photoelectrical coupler U7 and disconnects; the circuit that accesses to the protected equipment of output control unit 106 also disconnects simultaneously, thereby can effectively protect protected equipment.
This display unit 108, this alarm unit 110, this memory cell 112, this push-button unit 114 and this power subsystem 116 are connected to the output port of CPU 104 correspondences respectively.
This display unit 108 comprises light-emitting diode (LED) display part, and it can show real-time current value and alarm current.This alarm unit 110 comprises buzzer and triode, when the overcurrent situation occurs, thereby CPU 104 triggers this triode conducting buzzer is sounded the alarm.
This push-button unit 114 comprises four buttons, can realize the function of " upwards (Up) " " (Down) downwards " " catalogue (Menu) " " input (Enter) " respectively, its effect comprises: 1) inquiry effect: as protected equipment work after a period of time, and the size of current of the number of times of its a certain circuit generation overcurrent condition, each overcurrent condition; 2) parameter setting:, the work that will how long recover protected equipment behind the power supply of protected equipment or the deenergization takes place whether to disconnect behind the overcurrent condition as set allowing the maximum current of protected equipment; 3) operating state is selected: the State Selection such as starting working, quit work of Over Current Protection System.
This memory cell 112 is EEPROM (Electrically Erasable Programmable Read Only Memo) (Electrically Erasable ProgrammableRead-Only Memory, EEPROM), store above-mentioned relevant data, call to correlation unit for CPU as above-mentioned alarm current value historical record etc.This power subsystem 116 provides operating voltage for above-mentioned each unit, and it provides positive five volts (+5V) direct voltages.
The course of work of the Over Current Protection System 100 of the following simple declaration embodiment of the invention, it comprises normal condition and guard mode.
In normal condition; open this Over Current Protection System 100 earlier; and the user can carry out relevant parameter by 114 pairs of these Over Current Protection System 100 of push-button unit and set; as allow the lowest high-current value of protected equipment and alarm voltage etc.; allow the lowest high-current value of protected equipment to be stored in the CPU 104, other parameter such as alarm voltage then is stored in the memory cell 112.When the user set, these parameters all can be presented on the display unit 108 of this Over Current Protection System 100.Protected equipment (load) is started working, the operating current of the protected equipment of signal sample circuit 102 detecting real-times of Over Current Protection System 100.
In guard mode; when the overcurrent situation occurs; be CPU 104 relatively reach judgement from the current value of signal sample circuit 102 when allowing the lowest high-current value of protected equipment; display unit 108 shows this current value in real time; CPU 104 makes photoelectrical coupler U7 work by the current-limiting resistance R28 of output control circuit 106; the grid quilt of triac Q2 is via resistance R 25; the signal triggering of R26 and photoelectrical coupler U7 and disconnecting; so accessing to the protected circuitry at this triac Q2 two ends is off-state, thereby effectively protects protected equipment.
Be appreciated that; the quantity of signal sampling unit 102 and output control unit 106 is not limited to one; can two; three or more; sample to the electric current of an external circuit respectively in each signal sampling unit 102; the reverse-blocking tetrode thyristor correspondence of each output control unit 106 accesses to this correspondence external circuit to protect this external circuit, and therefore, the Over Current Protection System that the embodiment of the invention provides can be protected a plurality of circuit (equipment) simultaneously.
The Over Current Protection System 100 of present embodiment is by the current transformer T2 switching current value of signal acquisition circuit, certainty of measurement height, good linearity; Reach output control circuit 106 and comprise the bi-directional thyristor switch Q2 that is connected on single-chip microcomputer (CPU 104) output, bi-directional thyristor switch Q2 reaction speed is fast, and long service life can in time be protected protected equipment.
In addition; those skilled in the art can also do other variation in spirit of the present invention; as the quantity of output control circuit and the quantity of signal acquisition circuit, the selection of single-chip microcomputer type etc. are decided by the protected number of devices that is physically connected to this Over Current Protection System.Certainly, the variation that these are done according to spirit of the present invention, all should be included in the present invention's scope required for protection in.
Claims (10)
1. an Over Current Protection System is characterized in that, this Over Current Protection System comprises:
At least one signal sampling unit, the input of this at least one signal sampling unit links to each other with external circuit, and the current value of this external circuit of detecting real-time;
CPU, be preset with the lowest high-current value that allows external circuit in it, the output of at least one signal sampling unit of this CPU and this links to each other, and is used for the current value of received signal sample circuit and judges whether this current value is identical with the lowest high-current value that allows external circuit; And
At least one output control unit, it comprises reverse-blocking tetrode thyristor, and the input of this at least one output control unit links to each other with this CPU, and this reverse-blocking tetrode thyristor accesses in the external circuit; The current value of judging external circuit when CPU disconnects external circuit is disconnected thereby this CPU triggers this reverse-blocking tetrode thyristor when allowing the lowest high-current value of external circuit.
2. Over Current Protection System as claimed in claim 1; it is characterized in that; described signal sampling unit comprises front-end sampling circuit, rectification circuit and amplifying circuit; this front-end sampling circuit is gathered ac signal and is exported the ac signal of gathering to this rectification circuit; this rectification circuit receives the ac signal and the rectification of gathering and exports this amplifying circuit to, and the output of this amplifying circuit is connected to CPU.
3. Over Current Protection System as claimed in claim 2; it is characterized in that; described output control unit further comprises current-limiting resistance, photoelectrical coupler; when the current value of external circuit when allowing the lowest high-current value of external circuit; this CPU triggers this reverse-blocking tetrode thyristor disconnection through current-limiting resistance and photoelectrical coupler, thereby the external circuit that accesses to this reverse-blocking tetrode thyristor is disconnected.
4. Over Current Protection System as claimed in claim 1; it is characterized in that; described Over Current Protection System also comprises alarm unit; display unit; memory cell; push-button unit and power subsystem; this alarm unit is connected to the output of CPU; when the current value of external circuit when allowing the lowest high-current value of external circuit; this alarm unit of this central processing unit controls carries out audible alarm; the current value of this cell stores external circuit calls and is presented on the display unit greater than the number of times of the lowest high-current value that allows external circuit and the current value of external circuit for CPU; this display unit is connected to the output of CPU; with the current value of the current value that shows external circuit and external circuit number of times greater than the lowest high-current value that allows external circuit; this push-button unit can be imported relevant parameter to CPU by the user, and this power subsystem provides power supply for above-mentioned each unit.
5. Over Current Protection System as claimed in claim 2 is characterized in that described rectification circuit is a bridge rectifier.
6. Over Current Protection System as claimed in claim 1 is characterized in that described power subsystem provides positive five volts direct voltage.
7. Over Current Protection System as claimed in claim 1 is characterized in that, described reverse-blocking tetrode thyristor is a triac.
8. Over Current Protection System as claimed in claim 1 is characterized in that, described CPU is a single-chip microcomputer.
9. Over Current Protection System as claimed in claim 1; it is characterized in that; the quantity of described signal sampling unit is a plurality of; the quantity of this output control unit is a plurality of; each signal sampling unit is corresponding respectively to link to each other with an external circuit; the output of each signal sampling unit all links to each other with CPU, and the input of each output control unit all links to each other with CPU, and the reverse-blocking tetrode thyristor of each output control unit accesses to respectively in the external circuit corresponding with each signal sampling unit.
10. Over Current Protection System as claimed in claim 2 is characterized in that, described amplifying circuit is universal dual operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102011284A CN101350512A (en) | 2007-07-19 | 2007-07-19 | Over current protective system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102011284A CN101350512A (en) | 2007-07-19 | 2007-07-19 | Over current protective system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101350512A true CN101350512A (en) | 2009-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007102011284A Pending CN101350512A (en) | 2007-07-19 | 2007-07-19 | Over current protective system |
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| CN (1) | CN101350512A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088177A (en) * | 2010-12-31 | 2011-06-08 | 上海华宿电气技术有限公司 | Arc-extinguishing electric fireproofing short circuit protection device and method |
| CN103219694A (en) * | 2013-04-17 | 2013-07-24 | 宁波汉浦工具有限公司 | Over-current protecting circuit |
| CN104682332A (en) * | 2013-11-30 | 2015-06-03 | 哈尔滨智木科技有限公司 | Intelligent high-current circuit breaker |
| CN106207948A (en) * | 2016-07-25 | 2016-12-07 | 贝兹维仪器(苏州)有限公司 | There is the logger circuit protection device of warning function |
| CN106410759A (en) * | 2015-07-29 | 2017-02-15 | 青岛海尔空调电子有限公司 | Method and device for communication overcurrent protection of AC wire controller |
| CN112582990A (en) * | 2020-12-28 | 2021-03-30 | 苏州同毅自动化技术有限公司 | Isolated DC bus bidirectional overcurrent protection circuit and method |
| CN113451996A (en) * | 2021-06-21 | 2021-09-28 | 中国煤炭科工集团太原研究院有限公司 | Method and device for managing power supply of explosion-proof electrical equipment |
-
2007
- 2007-07-19 CN CNA2007102011284A patent/CN101350512A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088177A (en) * | 2010-12-31 | 2011-06-08 | 上海华宿电气技术有限公司 | Arc-extinguishing electric fireproofing short circuit protection device and method |
| CN103219694A (en) * | 2013-04-17 | 2013-07-24 | 宁波汉浦工具有限公司 | Over-current protecting circuit |
| CN103219694B (en) * | 2013-04-17 | 2015-09-23 | 宁波汉浦工具有限公司 | Current foldback circuit |
| CN104682332A (en) * | 2013-11-30 | 2015-06-03 | 哈尔滨智木科技有限公司 | Intelligent high-current circuit breaker |
| CN106410759A (en) * | 2015-07-29 | 2017-02-15 | 青岛海尔空调电子有限公司 | Method and device for communication overcurrent protection of AC wire controller |
| CN106410759B (en) * | 2015-07-29 | 2018-12-18 | 青岛海尔空调电子有限公司 | A kind of method and device thereof of exchange line control machine communication overcurrent protection |
| CN106207948A (en) * | 2016-07-25 | 2016-12-07 | 贝兹维仪器(苏州)有限公司 | There is the logger circuit protection device of warning function |
| CN112582990A (en) * | 2020-12-28 | 2021-03-30 | 苏州同毅自动化技术有限公司 | Isolated DC bus bidirectional overcurrent protection circuit and method |
| CN113451996A (en) * | 2021-06-21 | 2021-09-28 | 中国煤炭科工集团太原研究院有限公司 | Method and device for managing power supply of explosion-proof electrical equipment |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090121 |