CN209881652U - Digital input EMC circuit applied to crane control system - Google Patents
Digital input EMC circuit applied to crane control system Download PDFInfo
- Publication number
- CN209881652U CN209881652U CN201920658534.1U CN201920658534U CN209881652U CN 209881652 U CN209881652 U CN 209881652U CN 201920658534 U CN201920658534 U CN 201920658534U CN 209881652 U CN209881652 U CN 209881652U
- Authority
- CN
- China
- Prior art keywords
- circuit
- filter circuit
- control system
- capacitor
- resistor
- 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.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
A digital quantity input EMC circuit applied to a crane control system comprises a self-reset fuse PTC, an input filter circuit, a surge protection circuit, an optical coupling isolation circuit and an output filter circuit, wherein the input filter circuit comprises a first resistor R1 and a first capacitor C1, the surge protection circuit comprises a bidirectional TVS tube D2, the optical coupling isolation circuit comprises an optical coupling U and a second resistor R2, and the output filter circuit comprises a third resistor R3 and a second capacitor C2; EMC circuit can realize the self-resuming function after the trouble, has multiple anti-interference function, and the protection is comprehensive, and simple structure, with low costs and easily realization, the commonality is good, can guarantee digital input signal's among the crane control system stability, accuracy.
Description
Technical Field
The utility model belongs to the technical field of crane control system circuit design and specifically relates to a be applied to crane control system's digital quantity input EMC circuit has been related to.
Background
With the '2025 Chinese manufacturing' goal proposed in China, the demand of intelligent manufacturing is rising in various industries. The crane is used as an important link for carrying and logistics transportation, and the requirements for automation and intellectualization are imperative; the important premise for realizing automation and intellectualization is the stability of signal transmission; among many transmission signals, digital signals are important.
For heavy machinery such as a crane, the integrity and accuracy of digital signal transmission are important prerequisites for ensuring safe production; the crane is provided with more electronic equipment such as a frequency converter, a circuit breaker and the like, in the engineering operation, the EMC problems of mutual interference, radiation and the like exist between the equipment, between the external environment (such as lightning stroke) and the equipment and between strong current and weak current, and some I/O quantity signals are easily subjected to high-voltage surge impact under a specific environment, which can cause the information collected by a crane control system in a digital quantity channel to be wrong or invalid, further can cause wrong judgment and action and cause serious safety accidents; the traditional EMC circuit of present hoist control system, some only have isolation, and some only have surge protection, and the commonality is not strong, if every kind of function all installs one set of equipment additional, the space occupies greatly and the cost is higher.
SUMMERY OF THE UTILITY MODEL
In order to overcome not enough among the background art, the utility model discloses a be applied to crane control system's digital quantity input EMC circuit, the protection is comprehensive, and is with low costs and easily realize, and the commonality is strong.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a digital input EMC circuit applied to a crane control system comprises a self-reset fuse PTC, an input filter circuit, a surge protection circuit, an optical coupling isolation circuit and an output filter circuit; the self-reset fuse PTC, the input filter circuit, the surge protection circuit, the optical coupling isolation circuit and the output filter circuit are sequentially connected; one end of the self-resetting fuse PTC is connected with an external digital signal input end, and the output end of the output filter circuit is connected with a CPU of the control system.
Preferably, the self-resetting fuse PTC is connected to the input filter circuit through a diode D1; the anode of the diode D1 is connected with the self-resetting fuse PTC, and the cathode of the diode D1 is connected with the input filter circuit.
Preferably, the input filter circuit comprises a first resistor R1 and a first capacitor C1; one end of the first resistor R1 is connected with the cathode of the diode D1, and the other end is connected with the anode of the first capacitor C1; the negative electrode of the first capacitor C1 is connected to the system ground GND.
Preferably, the surge protection circuit comprises a bidirectional TVS tube D2; the bidirectional TVS tube D2 is connected in parallel with the first capacitor C1 of the input filter circuit, one end of the bidirectional TVS tube D2 is connected with the anode of the first capacitor C1, and the other end is connected with the system ground GND.
Preferably, the optical coupler isolation circuit comprises an optical coupler U and a second resistor R2; the positive pole of opto-coupler U with first electric capacity C1 positive pole links to each other among the input filter circuit, the negative pole of opto-coupler U connects system ground GND, the collecting electrode of opto-coupler U passes through second resistance R2 and links to each other with the power VCC, the projecting pole of opto-coupler U connects system ground GND.
Preferably, the output filter circuit comprises a third resistor R3 and a second capacitor C2; the positive electrode of the second capacitor C2 and one end of the third resistor R3 are both connected with the collector of an optocoupler U in the optocoupler-isolation circuit, the negative electrode of the second capacitor C2 is connected with a system ground GND, and the other end of the third resistor R3 is connected with a CPU of a control system.
Due to the adoption of the technical scheme, the utility model discloses following beneficial effect has: the self-recovery function after the circuit breaks down can be realized, the self-recovery circuit has multiple anti-interference functions such as external surge and electromagnetic interference, is comprehensive in protection, simple in structure, low in cost and easy to realize, can be used in any single chip microcomputer or embedded system used by a crane control system, can well guarantee the stability and accuracy of a digital input signal, and lays a foundation for reliable and stable operation of a crane.
Drawings
FIG. 1 is a schematic diagram of the structure of the analog output isolation circuit of the present invention;
fig. 2 is a schematic diagram of the analog output isolation circuit of the present invention.
In the figure: 1. a signal conditioning circuit; 2. an isolation amplifying circuit; 3. a gain amplification circuit; 4. an output sampling circuit; 5. a voltage follower circuit; 6. a voltage divider circuit.
Detailed Description
The present invention can be explained in detail by the following embodiments, and the object of the present invention is to protect all technical improvements within the scope of the present invention, and the present invention is not limited to the following embodiments.
As shown in fig. 1, the EMC circuit of the present invention includes a self-resetting fuse PTC, an input filter circuit 1, a surge protection circuit 2, an optical coupling isolation circuit 3 and an output filter circuit 4; the self-reset fuse PTC, the input filter circuit 1, the surge protection circuit 2, the optical coupling isolation circuit 3 and the output filter circuit 4 are sequentially connected; one end of the self-reset fuse PTC is connected with an external digital signal input end, and the output end of the output filter circuit 4 is connected with a CPU of the control system.
As shown in fig. 2, the self-resetting fuse PTC is connected to the input filter circuit 1 through a diode D1; the anode of the diode D1 is connected with the self-resetting fuse PTC, and the cathode is connected with the input filter circuit 1; when the circuit is short-circuited or overloaded, the self-reset fuse PTC is in a high-resistance state to prevent external large current from flowing into the control system, and the self-reset fuse PTC is restored to a low-resistance state after the fault is eliminated to keep a path; the diode D1 not only ensures the correct flow direction of the digital signal, but also prevents the reverse connection of the positive and negative electrodes of the external circuit.
The input filter circuit 1 comprises a first resistor R1 and a first capacitor C1; one end of the first resistor R1 is connected with the cathode of the diode D1, and the other end of the first resistor R1 is connected with the anode of the first capacitor C1; the negative electrode of the first capacitor C1 is connected with the system ground GND; the first resistor R1 and the first capacitor C1 form an RC filter circuit for suppressing the high frequency signal at the input terminal and for dividing the voltage to provide a proper voltage for the bidirectional TVS transistor D2.
The surge protection circuit 2 comprises a bidirectional TVS tube D2; the bidirectional TVS tube D2 is connected in parallel with the first capacitor C1 in the input filter circuit 1, one end of the bidirectional TVS tube D2 is connected with the anode of the first capacitor C1, and the other end is connected with the system ground GND; the bidirectional TVS tube D2 is used to suppress the surge current caused by electrostatic discharge, lightning, and the like from impacting the circuit.
The optical coupler isolation circuit 3 comprises an optical coupler U and a second resistor R2; the anode of the optocoupler U is connected with the anode of a first capacitor C1 in the input filter circuit 1, the cathode of the optocoupler U is connected with a system ground GND, the collector of the optocoupler U is connected with a power supply VCC through a second resistor R2, and the emitter of the optocoupler U is connected with the system ground GND; the second resistor R2 is a pull-up resistor of the optical coupler U, the optical coupler U is used as an EMC circuit terminal isolation element, the output signal and the main control circuit are isolated and transmitted, and the anti-interference performance of the control system can be greatly improved.
The output filter circuit 4 comprises a third resistor R3 and a second capacitor C2; the anode of the second capacitor C2 and one end of the third resistor R3 are both connected with the collector of an optocoupler U in the optocoupler-isolation circuit 3, the cathode of the second capacitor C2 is connected with a system ground GND, and the other end of the third resistor R3 is connected with a CPU of a control system; the third resistor R3 and the second capacitor C2 form an RC filter circuit for filtering out the glitch in the signal at the output terminal.
When an external digital signal flows into the EMC circuit from the input port, the external digital signal firstly flows through the self-resetting fuse PTC, and if the current and the voltage exceed the range of the self-resetting fuse PTC, the self-resetting fuse PTC is automatically disconnected, so that the protection of a control system is realized; after the fault is eliminated, the self-reset fuse PTC restores the circuit, and the electric signal enters the filter circuit 1 at the input end through the diode D1 to be filtered, so that a high-frequency signal is filtered; if the input channel is interfered by transient surge current in series, the bidirectional TVS tube D2 is conducted in a very short time, high-energy interference signals are attenuated and restored to a high-impedance state in a very short time, and the electric signals can be continuously and normally transmitted; the filtered electric signal is loaded to the anode of the optocoupler U, the optocoupler U is driven to generate a voltage or current signal at the output end, and the voltage or current signal is filtered by the output filter circuit 4 and enters the CPU of the control system, so that stable transmission of the digital signal is realized.
The part of the utility model not detailed is prior art.
Claims (6)
1. A digital input EMC circuit applied to a crane control system is characterized in that: the circuit comprises a self-reset fuse PTC, an input filter circuit (1), a surge protection circuit (2), an optical coupling isolation circuit (3) and an output filter circuit (4); the self-reset fuse PTC, the input filter circuit (1), the surge protection circuit (2), the optical coupling isolation circuit (3) and the output filter circuit (4) are sequentially connected; one end of the self-resetting fuse PTC is connected with an external digital signal input end, and the output end of the output filter circuit (4) is connected with a CPU of the control system.
2. The digital quantity input EMC circuit applied to the crane control system as claimed in claim 1, wherein: the self-reset fuse PTC is connected with the input filter circuit (1) through a diode D1; the anode of the diode D1 is connected with the self-resetting fuse PTC, and the cathode of the diode D1 is connected with the input filter circuit (1).
3. The digital quantity input EMC circuit applied to the crane control system as claimed in claim 2, wherein: the input filter circuit (1) comprises a first resistor R1 and a first capacitor C1; one end of the first resistor R1 is connected with the cathode of the diode D1, and the other end is connected with the anode of the first capacitor C1; the negative electrode of the first capacitor C1 is connected to the system ground GND.
4. The digital quantity input EMC circuit applied to the crane control system as claimed in claim 3, wherein: the surge protection circuit (2) comprises a bidirectional TVS tube D2; the bidirectional TVS tube D2 is connected in parallel with a first capacitor C1 in the input filter circuit (1), one end of a bidirectional TVS tube D2 is connected with the anode of the first capacitor C1, and the other end is connected with a system ground GND.
5. The digital quantity input EMC circuit applied to the crane control system as claimed in claim 3, wherein: the optical coupler isolation circuit (3) comprises an optical coupler U and a second resistor R2; the positive pole of opto-coupler U with input filter circuit (1) in first electric capacity C1 positive pole link to each other, the negative pole of opto-coupler U connects system ground GND, the collecting electrode of opto-coupler U passes through second resistance R2 and links to each other with the power VCC, the projecting pole of opto-coupler U connects system ground GND.
6. The digital quantity input EMC circuit applied to the crane control system as claimed in claim 5, wherein: the output filter circuit (4) comprises a third resistor R3 and a second capacitor C2; the positive electrode of the second capacitor C2 and one end of the third resistor R3 are both connected with the collector of an optocoupler U in the optocoupler-isolation circuit (3), the negative electrode of the second capacitor C2 is connected with a system ground GND, and the other end of the third resistor R3 is connected with a CPU of a control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920658534.1U CN209881652U (en) | 2019-05-09 | 2019-05-09 | Digital input EMC circuit applied to crane control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920658534.1U CN209881652U (en) | 2019-05-09 | 2019-05-09 | Digital input EMC circuit applied to crane control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209881652U true CN209881652U (en) | 2019-12-31 |
Family
ID=68965111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920658534.1U Active CN209881652U (en) | 2019-05-09 | 2019-05-09 | Digital input EMC circuit applied to crane control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209881652U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117559234A (en) * | 2024-01-12 | 2024-02-13 | 广东正超电气有限公司 | Inter-room signal transmission bus device of power distribution cabinet |
-
2019
- 2019-05-09 CN CN201920658534.1U patent/CN209881652U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117559234A (en) * | 2024-01-12 | 2024-02-13 | 广东正超电气有限公司 | Inter-room signal transmission bus device of power distribution cabinet |
| CN117559234B (en) * | 2024-01-12 | 2024-04-19 | 广东正超电气有限公司 | Inter-room signal transmission bus device of power distribution cabinet |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201467084U (en) | High-voltage pulse electronic fence circuit | |
| CN103076489A (en) | Instantaneous overcurrent detecting circuit of optical fiber communication cascade type high-voltage inverter | |
| CN209881652U (en) | Digital input EMC circuit applied to crane control system | |
| CN102749501B (en) | Isolated direct current high voltage detection method and isolated direct current high voltage detection circuit | |
| CN106034369A (en) | LED power supply with short-circuit protection circuit | |
| CN105577169A (en) | Vehicle-used wide-range voltage switching quantity input circuit | |
| CN207650383U (en) | A kind of transformer disconnection detection circuit of breaker | |
| CN201378730Y (en) | Power circuit breaker protective circuit | |
| CN106100128B (en) | Monitoring device is isolated in active power distribution network intelligent terminal accumulator | |
| CN105223433A (en) | Metal oxide arrester on-line monitoring system | |
| CN102694541B (en) | Loop latching circuit | |
| CN211478434U (en) | Low-cost isolated analog signal monitoring circuit | |
| CN211628046U (en) | Digital signal acquisition circuit of power distribution switch monitoring terminal | |
| CN204992542U (en) | Dead type overvoltage crowbar of lock | |
| CN208623326U (en) | A kind of high_voltage isolation over-voltage detection protection circuit | |
| CN210037954U (en) | Power supply voltage overvoltage and undervoltage protection indicating circuit | |
| CN209087566U (en) | A kind of adjustable more protection electronic current mutual-inductance apparatus of secondary voltage signal | |
| CN218102557U (en) | Anti-interference relay protection device | |
| CN201716293U (en) | Combustible gas concentration acquisition module | |
| CN210514443U (en) | High-performance radio frequency detection circuit | |
| CN217010683U (en) | Power supply control circuit with single-ended power supply input and multi-ended control output | |
| CN208888679U (en) | A kind of lithium-cell plate discharge over-current protection circuit | |
| CN217981626U (en) | Signal sampling circuit for mining microcomputer protection device | |
| CN217655190U (en) | Support inside and outside power supply's 4-20mA current signal acquisition circuit | |
| CN216751175U (en) | Secondary resonance elimination circuit of voltage transformer arranged in controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |