CN202903873U - RS485 circuit used for single-phase watt-hour meter - Google Patents
RS485 circuit used for single-phase watt-hour meter Download PDFInfo
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- CN202903873U CN202903873U CN 201220506943 CN201220506943U CN202903873U CN 202903873 U CN202903873 U CN 202903873U CN 201220506943 CN201220506943 CN 201220506943 CN 201220506943 U CN201220506943 U CN 201220506943U CN 202903873 U CN202903873 U CN 202903873U
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Abstract
The utility model relates to an RS485 circuit for a single-phase watt-hour meter. The RS485 circuit comprises an RS485 communication port (1) which is provided with a receiving terminal and a transmitting terminal. The RS485 circuit is characterized in that the RS485 circuit further comprises an electrostatic protection module (2) used for preventing the single-phase watt-hour meter from being damaged by static electricity; the electrostatic protection module (2) is electrically connected with the RS485 communication port (1); and the electrostatic protection module (2) is provided with wiring terminals used for communicating with a main chip of the single-phase watt-hour meter. The RS485 circuit for the single-phase watt-hour meter of the utility model can effectively prevent electrostatic damage.
Description
Technical field
The utility model relates to single-phase electric energy meter circuit engineering field, specifically refers to a kind of RS485 circuit for single-phase electric energy meter.
Background technology
Along with the high speed of electron trade, flourish, electronic devices and components have promoted the extensive utilization of extensive and VLSI (very large scale integrated circuit) to the future development of high-performance, high integrated, low-power consumption.Along with the gap in the integrated circuit is more and more less, dielectric isolation layer is more and more thinner, add and used in a large number plastics and macromolecular material etc. easily to produce the material of static in the process of electronic product, the generation that causes static charge and accumulation are in a more serious state all the time, this greatly reduces product reliability undoubtedly, has improved the repair rate of product.Particularly single-phase electric energy meter is subject to destruction and the interference of static easily in production and hanging net operation process, the RS485 circuit that is used for single-phase electric energy meter is exactly a part that is subject to easily electrostatic damage, RS485 circuit for single-phase electric energy meter of the prior art does not have special electrostatic defending module, when electric energy meter in process of production and the person of checking meter of Utilities Electric Co. when electric energy meter is carried out the RS485 communication, can touch 485 PORT COM of table meter, the static that produces in this process just might cause 485 mouthfuls damage.In sum, the RS485 circuit for single-phase electric energy meter can not well prevent electrostatic damage in the prior art.
The utility model content
The technical problems to be solved in the utility model is that a kind of RS485 circuit that is used for single-phase electric energy meter that can effectively prevent electrostatic damage is provided.
For solving the problems of the technologies described above, the technical scheme that the utility model provides is: a kind of RS485 circuit for single-phase electric energy meter, it comprises the RS485 PORT COM, the RS485 PORT COM is provided with and receives terminal and send terminal, it also comprises be used to preventing that electric energy meter is by the electrostatic defending module of electrostatic damage, described electrostatic defending module is electrically connected with the RS485 PORT COM, and described electrostatic defending module is provided with for the connection terminal that carries out communication with the master chip of single-phase electric energy meter.
After adopting above structure, the utlity model has following advantage: it also comprises be used to preventing that single-phase electric energy meter is by the electrostatic defending module of electrostatic damage, described electrostatic defending module is electrically connected with the RS485 PORT COM, and described electrostatic defending module is provided with for the connection terminal that carries out communication with the master chip of single-phase electric energy meter.When special electrostatic defending module was carried out communication as the user by RS485 port and electric energy meter, effectively filtering passed static to the single-phase electric energy meter master chip from the RS485 port, thereby prevents that effectively single-phase electric energy meter is by electrostatic damage.
As preferably, described electrostatic defending module comprises six connection terminals, it is respectively the first connection terminal, the second connection terminal, the 3rd connection terminal, the 4th connection terminal, the 5th connection terminal and the 6th connection terminal, described electrostatic defending module comprises that also four switching diodes are respectively D1, D2, D3 and D4, two conventional, electric-resistance are respectively R1 and R2, TVS pipe (TVS namely: TRANSIENT VOLTAGE SUPPRESSOR or claim that the transient voltage twin zener dioder is a kind of new product that grows up on stabilivolt technique basis, its circuit symbol is identical with common voltage stabilizing diode, profile also is as good as with general-purpose diode, when the high energy impact events of moment is stood at TVS pipe two ends, it can make with high speed its impedance suddenly reduce, absorb simultaneously a large electric current, with the voltage clamp between its two ends on a predetermined numerical value, thereby the circuit component of guaranteeing the back is avoided the high-octane impact of transient state and is damaged.), two thermistors are respectively RTA and RTB, the first connection terminal is power supply terminal, the 4th connection terminal is ground terminal, the second connection terminal is connected with the 5th connection terminal by thermistor RTB, the 3rd connection terminal is connected with the 6th connection terminal by thermistor RTA, the 5th connection terminal is successively by thermistor RTB, TVS pipe is connected with thermistor RTA and is connected with the 6th connection terminal, the second connection terminal is by resistance R 2 rear ground connection, the second connection terminal is connected with the first connection terminal by behind the switching diode D2, the 3rd connection terminal is connected with the first connection terminal by behind the switching diode D1, the 3rd connection terminal passes through to be connected with the first connection terminal after the resistance R 1, the 4th connection terminal is connected with the 3rd connection terminal by behind the switching diode D3, and the 4th connection terminal is connected with the second connection terminal by behind the switching diode D4.When static entered electric energy meter inside from the RS485 port, the response time of TVS pipe was the fastest, and transient switching will enter the voltage clamping of single-phase electric energy meter inside in a qualified scope.Simultaneously after the conducting of TVS pipe; produced an instantaneous peak point current; when peak point current passes through thermistor RTA and thermistor RTB; two thermistors can generate heat; its impedance increases several orders of magnitude within a few tens of milliseconds; thereby born most pressure drop, the electric current by thermistor can reduce gradually subsequently, thereby has protected the TVS pipe.Switching diode D1 and D3, D2 and D4 are equivalent to connect respectively in the circuit; be connected on respectively the second connection terminal and the 3rd connection terminal middle; because switching diode is that forward works; the direct impulse that has the instantaneous high pressure pulse to enter the second connection terminal and the 3rd connection terminal on protected circuit can discharge by switching diode D1 and D2 respectively, so that the voltage that enters in the chip from circuit maintains within the safe range.
As improvement, described electrostatic defending module also comprises a stabilivolt D801, and the 4th connection terminal is connected with the first connection terminal by behind the stabilivolt D801.This structure can be discharged into earth terminal fast so that surpass the instantaneous peak value voltage of power supply, thereby has avoided the electric energy meter internal components to suffer the impact of overvoltage and be damaged.
Description of drawings
Fig. 1 is the principle schematic that the utility model is used for the RS485 circuit of single-phase electric energy meter.
Fig. 2 is that the utility model is used for the principle schematic under the RS485 circuit use state of single-phase electric energy meter.
As shown in the figure: 1, RS485 PORT COM, 2, the electrostatic defending module, 3, the electric energy meter master chip.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
By reference to the accompanying drawings 1, a kind of RS485 circuit for single-phase electric energy meter, it comprises RS485 PORT COM 1, RS485 PORT COM 1 is provided with and receives terminal and send terminal, it also comprises be used to preventing that electric energy meter is by the electrostatic defending module 2 of electrostatic damage, described electrostatic defending module 2 is electrically connected with RS485 PORT COM 1, and described electrostatic defending module 2 is provided with for the connection terminal that carries out communication with the master chip of single-phase electric energy meter.Described electrostatic defending module 2 comprises six connection terminals, it is respectively the first connection terminal, the second connection terminal, the 3rd connection terminal, the 4th connection terminal, the 5th connection terminal and the 6th connection terminal (corresponding mark has 1～6 arabic numeral respectively in accompanying drawing 1), described electrostatic defending module 2 comprises that also four switching diodes are respectively D1, D2, D3 and D4, two conventional, electric-resistance are respectively R1 and R2, a TVS pipe, two thermistors are respectively RTA and RTB, the first connection terminal is power supply terminal, the 4th connection terminal is ground terminal, the second connection terminal is connected with the 5th connection terminal by thermistor RTB, the 3rd connection terminal is connected with the 6th connection terminal by thermistor RTA, the 5th connection terminal is successively by thermistor RTB, TVS pipe is connected with thermistor RTA and is connected with the 6th connection terminal, the second connection terminal is by resistance R 2 rear ground connection, the second connection terminal is connected with the first connection terminal by behind the switching diode D2, the 3rd connection terminal is connected with the first connection terminal by behind the switching diode D1, the 3rd connection terminal passes through to be connected with the first connection terminal after the resistance R 1, the 4th connection terminal is connected with the 3rd connection terminal by behind the switching diode D3, and the 4th connection terminal is connected with the second connection terminal by behind the switching diode D4.Described electrostatic defending module 2 also comprises a stabilivolt D801, and the 4th connection terminal is connected with the first connection terminal by behind the stabilivolt D801.
The utility model in the specific implementation, the direction of each diode be when describing in the literary composition the preceding terminal point to after terminal, be that operative orientation among the switching diode D2 is to point to the first connection terminal by the second connection terminal with " the second connection terminal by switching diode D2 then be connected with the first connection terminal " in the preamble.The utility model is when concrete the use, as shown in Figure 2, the electric energy meter master chip 3 that adopts take single-phase electric energy meter as the MAX13085 cake core as example, the first connection terminal is to link to each other with the VCC pin of master chip, the second connection terminal is to link to each other with the B pin of master chip, the 3rd connection terminal is to link to each other with the A pin of master chip, and the 4th connection terminal is to link to each other with the GND pin of master chip.Need to prove that because the first connection terminal is power supply terminal need simultaneously external power supply, the second connection terminal is earth terminal, need to carry out grounding connection, this belongs to those skilled in the art general knowledge, no longer describes in detail herein.
More than the utility model and embodiment thereof are described, this description does not have restricted, shown in the accompanying drawing also is one of embodiment of the present utility model, actual structure is not limited to this.If generally speaking those of ordinary skill in the art is enlightened by it, in the situation that does not break away from the utility model creation aim, without the creationary frame mode similar to this technical scheme and the embodiment of designing, all should belong to protection domain of the present utility model.
Claims (3)
1. RS485 circuit that is used for single-phase electric energy meter, it comprises RS485 PORT COM (1), RS485 PORT COM (1) is provided with and receives terminal and send terminal, it is characterized in that: it also comprises be used to preventing that single-phase electric energy meter is by the electrostatic defending module (2) of electrostatic damage, described electrostatic defending module (2) is electrically connected with RS485 PORT COM (1), and described electrostatic defending module (2) is provided with for the connection terminal that carries out communication with the master chip of single-phase electric energy meter.
2. the RS485 circuit for single-phase electric energy meter according to claim 1, it is characterized in that: described electrostatic defending module (2) comprises six connection terminals, it is respectively the first connection terminal, the second connection terminal, the 3rd connection terminal, the 4th connection terminal, the 5th connection terminal and the 6th connection terminal, described electrostatic defending module (2) comprises that also four switching diodes are respectively D1, D2, D3 and D4, two conventional, electric-resistance are respectively R1 and R2, a TVS pipe, two thermistors are respectively RTA and RTB, the first connection terminal is power supply terminal, the 4th connection terminal is ground terminal, the second connection terminal is connected with the 5th connection terminal by thermistor RTB, the 3rd connection terminal is connected with the 6th connection terminal by thermistor RTA, the 5th connection terminal is successively by thermistor RTB, TVS pipe is connected with thermistor RTA and is connected with the 6th connection terminal, the second connection terminal is by resistance R 2 rear ground connection, the second connection terminal is connected with the first connection terminal by behind the switching diode D2, the 3rd connection terminal is connected with the first connection terminal by behind the switching diode D1, the 3rd connection terminal passes through to be connected with the first connection terminal after the resistance R 1, the 4th connection terminal is connected with the 3rd connection terminal by behind the switching diode D3, and the 4th connection terminal is connected with the second connection terminal by behind the switching diode D4.
3. the RS485 circuit for single-phase electric energy meter according to claim 1, it is characterized in that: described electrostatic defending module (2) also comprises a stabilivolt D801, the 4th connection terminal is connected with the first connection terminal by behind the stabilivolt D801.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220506943 CN202903873U (en) | 2012-09-29 | 2012-09-29 | RS485 circuit used for single-phase watt-hour meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220506943 CN202903873U (en) | 2012-09-29 | 2012-09-29 | RS485 circuit used for single-phase watt-hour meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202903873U true CN202903873U (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220506943 Expired - Lifetime CN202903873U (en) | 2012-09-29 | 2012-09-29 | RS485 circuit used for single-phase watt-hour meter |
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|---|---|
| CN (1) | CN202903873U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112446495A (en) * | 2020-12-16 | 2021-03-05 | 安徽仕联电气有限公司 | Quantum computer communication module |
-
2012
- 2012-09-29 CN CN 201220506943 patent/CN202903873U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112446495A (en) * | 2020-12-16 | 2021-03-05 | 安徽仕联电气有限公司 | Quantum computer communication module |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 315191 Yinzhou Industrial Park, Zhejiang, Ningbo, Yinzhou District, Ningbo Patentee after: NINGBO SANXING MEDICAL & ELECTRIC Co.,Ltd. Address before: 315131, AUX Industrial Park, Mingguang North Road, Jiangshan Town, Ningbo, Yinzhou District, Zhejiang 1166, China Patentee before: NINGBO SANXING ELECTRIC Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130424 |
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| CX01 | Expiry of patent term |