CN214850476U - Protection circuit of power line carrier PLC collector - Google Patents
Protection circuit of power line carrier PLC collector Download PDFInfo
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- CN214850476U CN214850476U CN202121445023.5U CN202121445023U CN214850476U CN 214850476 U CN214850476 U CN 214850476U CN 202121445023 U CN202121445023 U CN 202121445023U CN 214850476 U CN214850476 U CN 214850476U
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Abstract
The utility model discloses a protection circuit of power line carrier PLC collector relates to data acquisition circuit protection technical field. The utility model comprises a piezoresistor, a first transient suppression diode, a second transient suppression diode, a third transient suppression diode, an electrostatic protection device, a temperature-sensitive protection resistor and a coupling transformer; the piezoresistor is connected between two lines of AC voltage in parallel; the first transient suppression diode is connected in parallel between two lines at the input end of the coupling transformer; the second transient suppression diode is connected in parallel between two lines at the output end of the coupling transformer. The utility model discloses at unit circuit such as power line carrier power end, uplink and downlink RS485 signal communication and other communication terminals and data interface, utilize anti surge, the static ability of transient suppression diode and electrostatic protection device, improved the reliability of product, fine protection whole collector system and internals promote the whole job stabilization nature of product.
Description
Technical Field
The utility model belongs to the technical field of the protection of data acquisition circuit, especially, relate to a protection circuit of power line carrier PLC collector, the wide application is in the terminal data acquisition working circuit in fields such as electric energy, water gauge signal, heat energy, wisdom gas.
Background
A Power Line carrier, specifically named Power Line Communication, PLC; the collector is an extended network device of the intelligent centralized meter reading system, receives instructions of the concentrator and the server and collects terminal data of the intelligent electric meter. When the PLC collector collects communication, the modes such as power line carrier waves are adopted, and the actual wiring difficulty and the system cost can be reduced. When the data are uploaded to the concentrator or the server, the working efficiency of the system can be improved by adopting wired or wireless modes and the like.
When the PLC collector is used for data collection and remote communication, factors such as surge caused by power line entering, static electricity on a communication line, electromagnetic environment change and the like often cause the main control chip MCU and the communication interface control chip to be easily damaged or not to normally work, and the communication speed and the product stability are difficult to guarantee.
SUMMERY OF THE UTILITY MODEL
The utility model provides a protection circuit of power line carrier PLC collector has solved above problem.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
the utility model discloses a protection circuit of power line carrier PLC collector, including PLC collector master control MCU, power supply circuit, power line carrier communication circuit, RS485 down communication circuit, RS485 goes upward communication circuit, GPRS/4G communication circuit, NB-IoT/LoRa communication circuit, Ethernet wired communication circuit, PSTN telephone line communication circuit, data storage circuit;
the device also comprises a piezoresistor, a first transient suppression diode, a second transient suppression diode, a third transient suppression diode, an electrostatic protection device, a temperature-sensitive protection resistor and a coupling transformer;
the piezoresistor is connected in parallel between two AC lines connected with the PLC collector main control MCU; the first transient suppression diode is connected in parallel between two lines at the input end of the coupling transformer; the second transient suppression diode is connected in parallel between two lines at the output end of the coupling transformer; the temperature-sensitive protection resistor is connected in series with one line of the alternating current input end.
Furthermore, the piezoresistor adopts a 20D zinc oxide device, and the current capacity is more than 5 kA.
Further, VBR of the second transient suppression diode TVS2 is 6.0V or 6.5V or 6.8V, and SMB packaging is adopted.
Further, the temperature-sensitive protective resistor adopts MF72 series.
Compared with the prior art, the utility model following beneficial effect including:
1. the voltage dependent resistor of the circuit adopts a 20D zinc oxide device, can finish transient voltage clamping in ns short time, has the through-current capacity of more than 5kA, has large through-current characteristic, and can well protect a rear-stage circuit;
2. the first transient suppression diode and the second transient suppression diode of the circuit of the utility model are packaged by SMB, the transient power is 600W-1000W, and the transient suppression diode can act at ps time to clamp and suppress possible transient voltage;
3. the utility model discloses the first temperature sensitive protection resistance NTC1 of circuit when surge current increases suddenly, can utilize self characteristic, produces the high resistance state, and the suppression current increases, prevents overflowing of back stage circuit.
4. The utility model discloses the varistor of circuit, temperature sensitive protection resistance, first transient state restrain diode second transient state restrain the diode at AC input end, and circuit integrated protection can be carried out to primary and secondary side of coupling transformer, can restrain overvoltage in the twinkling of an eye, also can prevent thunderbolt surge, and like this, electric power carrier controller PLC Control chip and collector wholly obtain fine protection, and the overall stability of product obtains guaranteeing.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a protection circuit structure of a power line carrier PLC acquisition device of the present invention;
fig. 2 is a schematic diagram of the power line carrier PLC interface protection circuit of the present invention;
fig. 3 is the schematic diagram of the MCU power supply protection circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Please refer to fig. 1-3, the utility model discloses a protection circuit of power line carrier PLC collector, including PLC collector master control MCU, power supply circuit, power carrier communication circuit, RS485 down communication circuit, RS485 go upward communication circuit, GPRS 4G communication circuit, NB-IoT loRa communication circuit, Ethernet wired communication circuit, PSTN telephone line communication circuit, data storage circuit, its characterized in that:
the power supply further comprises a piezoresistor MOV1, a first transient suppression diode TVS1, a second transient suppression diode TVS2, a third transient suppression diode TVS3, an electrostatic protection device ESD1, a temperature-sensitive protection resistor NTC1, a coupling transformer T1, a power carrier step-down circuit R1 and C1;
the voltage dependent resistor MOV1 is connected in parallel between two AC lines connected with the PLC collector main control MCU; the first transient suppression diode TVS1 is connected in parallel between the two lines coupling the input terminals of the transformer T1; the second transient suppression diode TVS2 is connected in parallel between two lines at the output end of the coupling transformer T1; the temperature-sensitive protection resistor NTC1 is connected in series with one line of the AC input end.
The piezoresistor MOV1 is a 20D zinc oxide device, the current capacity is above 5kA, and the transient overvoltage protection can be carried out on the alternating current line.
The VBR of the second transient suppression diode TVS2 is 6.0V, 6.5V, or 6.8V, and is packaged by SMB DO-214AA), with a typical model number of SMBJ6.5CA, or P6SMB6.8CA; and performing overvoltage clamping protection on the secondary side of the transformer.
The temperature-sensitive protection resistor NTC1 is MF72 series, the typical model is 5D-9, and overcurrent suppression can be performed on inrush current entering an alternating current power line.
In the circuit of the utility model, the PLC collector main control chip MCU realizes the collection of electric quantity information to the downlink ammeter, and after the pretreatment, the data is uploaded to the upper level (concentrator) through wired (RS485\ Ethernet \ PSTN) or wireless (GPRS \4G \ NB-IoT \ LoRa) communication modes; and the instruction issued by the concentrator is issued to the terminal intelligent electric meter.
In summary, the following steps: the utility model discloses a power carrier PLC collector designs effectual protection scheme, at unit circuit such as power carrier power end, up-and-down RS485 signal communication and other communication ends and data interface, utilizes anti surge, the static ability of transient suppression diode and electrostatic protection device, has improved the reliability of product, fine protection whole collector system and inner part promote the whole job stabilization nature of product
Has the advantages that:
1. the voltage dependent resistor of the circuit adopts a 20D zinc oxide device, can finish transient voltage clamping in ns short time, has the through-current capacity of more than 5kA, has large through-current characteristic, and can well protect a rear-stage circuit;
2. the first transient suppression diode and the second transient suppression diode of the circuit of the utility model are packaged by SMB, the transient power is 600W-1000W, and the transient suppression diode can act at ps time to clamp and suppress possible transient voltage;
3. the utility model discloses the first temperature sensitive protection resistance NTC1 of circuit when surge current increases suddenly, can utilize self characteristic, produces the high resistance state, and the suppression current increases, prevents overflowing of back stage circuit.
4. The utility model discloses the varistor of circuit, temperature sensitive protection resistance, first transient state restrain diode second transient state restrain the diode at AC input end, and circuit integrated protection can be carried out to primary and secondary side of coupling transformer, can restrain overvoltage in the twinkling of an eye, also can prevent thunderbolt surge, and like this, electric power carrier controller PLC Control chip and collector wholly obtain fine protection, and the overall stability of product obtains guaranteeing.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. The utility model provides a protection circuit of power line carrier PLC collector, includes PLC collector master control MCU, power supply circuit, power carrier communication circuit, RS485 downlink communication circuit, RS485 uplink communication circuit, GPRS 4G communication circuit, NB-IoT loRa communication circuit, Ethernet wired communication circuit, PSTN phone line communication circuit, data storage circuit, its characterized in that:
the device also comprises a piezoresistor, a first transient suppression diode, a second transient suppression diode, a third transient suppression diode, an electrostatic protection device, a temperature-sensitive protection resistor and a coupling transformer;
the piezoresistor is connected in parallel between two AC lines connected with the PLC collector main control MCU; the first transient suppression diode is connected in parallel between two lines at the input end of the coupling transformer; the second transient suppression diode is connected in parallel between two lines at the output end of the coupling transformer; the temperature-sensitive protection resistor is connected in series with one line of the alternating current input end.
2. The protection circuit of the power line carrier PLC collector of claim 1, wherein the piezoresistor is a 20D zinc oxide device with a current capacity above 5 kA.
3. The protection circuit of a power line carrier PLC collector of claim 1, wherein VBR of the second transient suppression diode TVS2 is 6.0V or 6.5V or 6.8V, and SMB packaging is adopted.
4. The protection circuit of the power line carrier PLC collector as claimed in claim 1, wherein the temperature-sensitive protection resistor is of MF72 series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121445023.5U CN214850476U (en) | 2021-06-28 | 2021-06-28 | Protection circuit of power line carrier PLC collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121445023.5U CN214850476U (en) | 2021-06-28 | 2021-06-28 | Protection circuit of power line carrier PLC collector |
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| Publication Number | Publication Date |
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| CN214850476U true CN214850476U (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121445023.5U Active CN214850476U (en) | 2021-06-28 | 2021-06-28 | Protection circuit of power line carrier PLC collector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115528801A (en) * | 2022-11-28 | 2022-12-27 | 深圳市兴晟图信息技术有限公司 | Power dynamic monitoring system |
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2021
- 2021-06-28 CN CN202121445023.5U patent/CN214850476U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115528801A (en) * | 2022-11-28 | 2022-12-27 | 深圳市兴晟图信息技术有限公司 | Power dynamic monitoring system |
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