CN107681627A - The current protecting circuit of control and protective switching device - Google Patents
The current protecting circuit of control and protective switching device Download PDFInfo
- Publication number
- CN107681627A CN107681627A CN201711161382.6A CN201711161382A CN107681627A CN 107681627 A CN107681627 A CN 107681627A CN 201711161382 A CN201711161382 A CN 201711161382A CN 107681627 A CN107681627 A CN 107681627A
- Authority
- CN
- China
- Prior art keywords
- circuit
- current
- control
- switching device
- electrical apparatus
- 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
- 230000001681 protective effect Effects 0.000 title claims abstract description 9
- 230000004043 responsiveness Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
Landscapes
- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Evolutionary Computation (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of current protecting circuit of control and protective switching device, it is characterized in that：Including current transformer, operational amplifier, comparator and the electrical apparatus release drive circuit being sequentially connected, the input of the current transformer connects three-phase current signal Ia, Ib, Ic, and microprocessor is provided between operational amplifier and the electrical apparatus release drive circuit.The current protecting circuit substantially increases the responsiveness of high current error protection, also reduces the cost of circuit design.
Description
Technical field
The present invention relates to a kind of current protecting circuit of control and protective switching device.
Background technology
The three-phase current signal of the current protecting circuit of existing control and protective switching device passes through " signal sample circuit "
" short-circuit detecting circuit " processing, then the signal being disposed is transmitted to " microcontroller circuit ", by " microcontroller circuit " root
Judged according to " short-circuit detecting circuit " incoming signal, and control " electrical apparatus release drive circuit " is gone according to the result of judgement；Should
Current protecting circuit design pattern the shortcomings that be：" signal sample circuit " and " short-circuit detecting circuit " itself does not possess fault-signal
Judgement and execution function, fault-signal by " signal sample circuit " and " short-circuit detecting circuit " handle after, it is necessary to pass through
Cross the processing of microprocessor and control action output.This design greatly reduces the responsiveness of current failure protection, also increases
The cost of circuit design is added.
The content of the invention
In view of the deficiency of background technology, the technical problems to be solved by the invention are to provide a kind of the dynamic of current failure protection
Make speed faster and the lower control and protective switching device of cost current protecting circuit.
Therefore, the present invention is adopted the following technical scheme that to realize：
The current protecting circuit of control and protective switching device, it is characterized in that：Including be sequentially connected current transformer, fortune
Calculation amplifier, comparator and electrical apparatus release drive circuit, input connection three-phase current signal Ia, Ib of the current transformer,
Ic, microprocessor is provided between operational amplifier and the electrical apparatus release drive circuit.
After adopting the above technical scheme, three-phase current signal Ia, Ib, Ic are handled and made through operational amplifier and comparator
Judge, and according to the result of judgement, directly go to control the action of electrical apparatus release drive circuit, need not move through microprocessor, this design
The responsiveness of high current error protection is substantially increased, also reduces the cost of circuit design.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Embodiment
Shown in reference picture 1, the current protecting circuit of control and protective switching device provided by the invention includes being sequentially connected
Current transformer 1, operational amplifier 2, comparator 3 and electrical apparatus release drive circuit 4, current transformer 1 input connection three
Phase current signal Ia, Ib, Ic, microprocessor 5 is provided between operational amplifier 2 and electrical apparatus release drive circuit 4.
Operation principle of the present invention is as follows：Three-phase current signal Ia, Ib, Ic are sampled through current transformer 1, and sampled result is passed through
Operational amplifier 2 carries out signal conversion and enhanced processing, and the signal handled through operational amplifier 2 is divided into two-way, all the way by micro-
Processor 5 carries out low current signal transacting, is judged and controls the signal output of electrical apparatus release drive circuit 4；Another way pass through than
Judge compared with device 3, and control the signal output of electrical apparatus release drive circuit 4.
Claims (1)
1. a kind of current protecting circuit of control and protective switching device, it is characterized in that：Including be sequentially connected current transformer,
Operational amplifier, comparator and electrical apparatus release drive circuit, the input connection three-phase current signal Ia of the current transformer,
Ib, Ic, microprocessor is provided between operational amplifier and the electrical apparatus release drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711161382.6A CN107681627A (en) | 2017-11-21 | 2017-11-21 | The current protecting circuit of control and protective switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711161382.6A CN107681627A (en) | 2017-11-21 | 2017-11-21 | The current protecting circuit of control and protective switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107681627A true CN107681627A (en) | 2018-02-09 |
Family
ID=61149699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711161382.6A Pending CN107681627A (en) | 2017-11-21 | 2017-11-21 | The current protecting circuit of control and protective switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107681627A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2127520Y (en) * | 1992-06-16 | 1993-02-24 | 林文宙 | Automatic circuit breaker |
| CN2574208Y (en) * | 2002-04-09 | 2003-09-17 | 丁文军 | Integrative earth leakage protector |
| CN201038719Y (en) * | 2006-12-22 | 2008-03-19 | 杭申控股集团有限公司 | Controller possessing spare quick brake-separating judging circuit |
| CN207504551U (en) * | 2017-11-21 | 2018-06-15 | 雷顿电气科技有限公司 | The current protecting circuit of control and protective switching device |
-
2017
- 2017-11-21 CN CN201711161382.6A patent/CN107681627A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2127520Y (en) * | 1992-06-16 | 1993-02-24 | 林文宙 | Automatic circuit breaker |
| CN2574208Y (en) * | 2002-04-09 | 2003-09-17 | 丁文军 | Integrative earth leakage protector |
| CN201038719Y (en) * | 2006-12-22 | 2008-03-19 | 杭申控股集团有限公司 | Controller possessing spare quick brake-separating judging circuit |
| CN207504551U (en) * | 2017-11-21 | 2018-06-15 | 雷顿电气科技有限公司 | The current protecting circuit of control and protective switching device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 325600 no.328, wei19 Road, Yueqing Economic Development Zone, Yueqing City, Wenzhou City, Zhejiang Province Applicant after: RADIN ELECTRIC TECHNOLOGY Co.,Ltd. Address before: 325604, No. 175, Station Road, Liushi Town, Wenzhou, Zhejiang, Yueqing Applicant before: RADIN ELECTRIC TECHNOLOGY Co.,Ltd. |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180209 |