CN203772954U - Three-phase four-wire electronic type prepayment electric energy meter platform table - Google Patents
Three-phase four-wire electronic type prepayment electric energy meter platform table Download PDFInfo
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- CN203772954U CN203772954U CN201420181571.5U CN201420181571U CN203772954U CN 203772954 U CN203772954 U CN 203772954U CN 201420181571 U CN201420181571 U CN 201420181571U CN 203772954 U CN203772954 U CN 203772954U
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Abstract
The utility model provides a three-phase four-wire electronic type prepayment electric energy meter platform table comprising an MCU, a power supply module, an RS485 module, a GPRS module, a small wireless module, an adsorption type infrared module, an MBUS module or a PLC module, an RS485 and GPRS interface conversion circuit, an MBUS and PLC module interface conversion circuit and a small wireless and adsorption type infrared interface conversion circuit. The RS485 module or the GPRS module is connected with a serial port of the MCU via the RS485 and GPRS interface conversion circuit. The small wireless module or the adsorption type infrared module is connected with the serial port of the MCU via the small wireless and adsorption type infrared interface conversion circuit. The MBUS module or the PLC module is connected with the serial port of the MCU via the MBUS and PLC module interface conversion circuit. The power supply module supplies power to the aforementioned modules. PCB utilization space is enhanced and intersecting selection among the modules is realized.
Description
Technical field
The utility model relates to a kind of electric energy meter, particularly a kind of three-phase and four-line electronic prepayment electric power table platform table.
Background technology
As shown in Figure 1, existing three-phase keyboard table adopts single chip solution to make, and function is complicated.Construction cycle is long, cost of development is high.In design, making, test process, can consume a large amount of human and material resources, financial resource.During keyboard table design, adopted PLC modular circuit to be arranged in the scheme on pcb board, module takies larger space, and the design of upper other modules of restriction table meter, if when client need to be such as MBUS, small wireless, these conventional modules of GPRS, need to re-start exploitation, cause the wasting of resources.Because PLC module is had relatively high expectations to layout, be directly arranged on the pcb board of table meter in addition, can cause the sensitivity of PLC own to decline.
Utility model content
The purpose of this utility model is to provide a kind of three-phase and four-line electronic prepayment electric power table platform table that between each communication function module, intersection is selected of realizing.
This three-phase and four-line electronic prepayment electric power table platform table that the utility model provides, comprises MCU, power module, RS485 module, GPRS module, small wireless module, absorption type infrared module, RS485 and GPRS interface conversion circuit, MBUS and PLC module interface change-over circuit and small wireless and absorption type infrared interface change-over circuit; Also have mbus module or PLC module, RS485 module or GPRS module are connected with the serial ports of MCU with GPRS interface conversion circuit by RS485; Small wireless module or absorption type infrared module are connected with the serial ports of MCU with absorption type infrared interface change-over circuit by small wireless; Mbus module or PLC module are connected with the serial ports of MCU with PLC module interface change-over circuit by MBUS; Power module is above-mentioned module for power supply.
Described RS485 and GPRS interface conversion circuit comprise optocoupler U8, optocoupler U13; The cathode terminal of optocoupler U8 is connected with GPRS interface or with the receiver output terminal of RS485 interface chip, the anode of this optocoupler is connected with power supply V485 by resistance R 165, its collector is connected with power supply V3P3SYS by resistance R 162, this collector is also connected with the serial port pin of described MCU, its emitter grounding; The anode of optocoupler U13 is connected with power supply V3P3SYS by resistance R 163, and its negative electrode is connected with the serial port pin of MCU; Its collector is connected with power supply V_485 by resistance R 17 when being equipped with described GPRS module, and this pin is also connected with the pin that receives signal in GPRS interface; This collector is connected with power supply V_485 by resistance R 66 when being equipped with described RS485 module; Its emitter-base bandgap grading passes through resistance R 67 ground connection when being equipped with described GPRS module; This emitter-base bandgap grading is by resistance R 164 ground connection when being equipped with described RS485 module, and this emitter-base bandgap grading is also connected with driver output enable end and the receiver output enable end of RS485 interface chip simultaneously.
Described MBUS and PLC module interface change-over circuit comprise optocoupler NS3, optocoupler NS4, or also comprise optocoupler U1; The collector of optocoupler NS3 is connected with power supply V3P3SYS by resistance R 215, and this pin is also connected with the serial port pin of described MCU, its emitter grounding; Its anode is connected with power supply V_485 by resistance R 219 when being connected with PLC module; This anode is connected with power supply V12 by resistance R 216 when being equipped with described mbus module; Its negative electrode is connected with the transmission data terminal of PLC module or is connected with the transmission data terminal of mbus module, and this negative electrode is also connected with power supply V12 by resistance R 190 when being equipped with described mbus module;
The anode of optocoupler NS4 is connected with power supply V3P3SYS by resistance R 191, and its negative electrode is connected with the serial port pin of described MCU; Its collector terminal is connected or receives FPDP with MBUS with PLC reception FPDP and is connected, and this collector is also connected with power supply V_485 by resistance R 220 when being equipped with described PLC module; Its emitter grounding; When being equipped with described PLC module, optocoupler U1 place in circuit, the anode of optocoupler U1 is connected with power supply V3P3SYS by resistance R 7, its negative electrode is connected with the IO port of described MCU, its collector is connected with power supply V_485 by resistance R 11, and this collector is also connected with power panel by resistance R 12 resistance in series R9; Its emitter grounding.
Described small wireless and absorption type infrared interface change-over circuit comprise two groups of resistance, every group of resistance comprises 2 resistance, when being equipped with small wireless module, small wireless module receives data terminal and is connected with the serial port pin A of described MCU by a resistance in a certain group of resistance, and its transmission data terminal is connected with the serial port pin B of described MCU by another resistance of this group resistance; When being equipped with absorption type infrared module, the reception data terminal of absorption type infrared module is connected with the serial port pin A of described MCU by a resistance in another group resistance, and its transmission data terminal is connected with the serial port pin B of described MCU by another resistance of this group resistance.
Described small wireless module and GPRS module arrangement are on logic pcb board, and described mbus module or PLC module arrangement are on power supply pcb board.
The utility model carries out brand-new design to schematic diagram circuit and PCB layout, by PLC, MBUS, small wireless, GPRS functional unit block are designed, the utilization ratio that has promoted PCB space, the intersection having realized between module is selected, and meets the demand of different user to disparate modules.The utility model can greatly shorten the construction cycle, reduces cost of development, reduces resource consumption, improve each functional unit performance.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of prior art.
Fig. 2 is functional block diagram of the present utility model.
RS485 when Fig. 3 is the GPRS of being equipped with module of the present utility model and GPRS interface conversion circuit figure.
RS485 when Fig. 4 is the RS485 of being equipped with module of the present utility model and GPRS interface conversion circuit figure.
Fig. 5 is mbus module circuit of the present utility model.
MBUS and PLC module interface change-over circuit when Fig. 6 is the PLC of being equipped with module of the present utility model.
Fig. 7 is MBUS and PLC module interface change-over circuit while being equipped with mbus module of the present utility model.
Fig. 8 is small wireless of the present utility model and absorption type infrared interface change-over circuit.
Fig. 9 is explosive view of the present utility model.
Embodiment
As shown in Figure 2, the utility model comprises MCU, voltage and current sample single module, Switching Power Supply, RS485 module or GPRS module, mbus module or PLC module, LCD/LED, external memory storage, mechanical relay control module, external voltage input detection module, absorption type infrared module or small wireless module.
It is that 71M6543G chip is management and the metering of MCU realization table meter that the utility model adopts the model of MAXIM company, can carry out sampling and the power calculation of A, B, C three-phase voltage current.GPRS module shares the same serial ports of MCU by interface conversion circuit and RS485.PLC module shares the same serial ports of MCU by interface conversion circuit and mbus module.Small wireless module by interface conversion circuit can with the same serial ports of the infrared shared MCU of absorption type.Utilize space surplus that above modularization is brought can realize integrated to external voltage input detecting circuit and mechanical relay control circuit.
As shown in Figure 3, RS485 and GPRS interface conversion circuit can allow RS485 module and GPRS module share the same serial ports of MCU.
When being equipped with GPRS module, RS485 and GPRS interface conversion circuit comprise optocoupler U8, optocoupler U13, GPRS interface.
The cathode terminal of optocoupler U8 is connected with GPRS interface, the anode of this optocoupler is connected with power supply V485 by resistance R 165, its collector is connected with power supply V3P3SYS by resistance R 162, and this collector is also connected with the serial port pin of MCU, for transmitting the information RX485_RX of reception; Its emitter grounding.The anode of optocoupler U13 is connected with power supply V3P3SYS by resistance R 163, and its negative electrode is connected with the serial port pin of MCU, for transmitting the information RX485_TX sending; Its collector is connected with power supply V_485 by resistance R 17, and this pin is also connected with the pin that receives signal in GPRS interface; Its emitter-base bandgap grading is by resistance R 67 ground connection.
Now, this Circnit Layout is: resistance R 17 is 1k Ω, and resistance R 67 is 0 Ω, and resistance R 165 is 1k Ω, and resistance R 162 and resistance R 163 are 680 Ω, can guarantee so the correct transmission of communication logic., to the resistance of resistance R 17, resistance R 67, select requirement higher herein, design can guarantee 9600 traffic rate like this.
As shown in Figure 4, when being equipped with RS485 module, RS485 and GPRS interface conversion circuit comprise optocoupler U8, optocoupler U13, RS485 interface chip U15.
The cathode terminal of optocoupler U8 is connected with the receiver output terminal RO of RS485 interface chip, the anode of this optocoupler is connected with power supply V485 by resistance R 165, its collector is connected with power supply V3P3SYS by resistance R 162, this collector is also connected with the serial port pin of MCU, for transmitting the information RX485_RX of reception; Its emitter grounding.The anode of optocoupler U13 is connected with power supply V3P3SYS by resistance R 163, and its negative electrode is connected with the serial port pin of MCU, for transmitting the information RX485_TX sending; Its collector is connected with power supply V_485 by resistance R 66; Its emitter-base bandgap grading is by resistance R 164 ground connection, and this emitter-base bandgap grading is also connected with driver output enable end DE and the receiver output enable end/RE of RS485 interface chip U15 simultaneously.
Now, this Circnit Layout is: resistance R 66 is 0k Ω, and resistance R 164 is 680 Ω, and resistance R 165 is 1k Ω, and resistance R 162 and resistance R 163 are 680 Ω, can realize two optocoupler RS485 communication.Equally, higher to the resistance requirement of resistance R 66 and resistance R 164 herein, otherwise be difficult to realize the stability that many baud rates are communicated by letter.
As shown in Figure 5, mbus module circuit comprises power conversion chip U18, comparer U16A and connector J2.Power supply V33 is MBUS driving power 33V, the power supply V12 power supply of being exported by the Switching Power Supply subsidiary loop acquisition of boosting.
MBUS data are to lean on the upset of comparer U16A to realize to the transmission of MCU, and in this process, diode D9, capacitor C 118, resistance R 193 have played vital effect.Diode D9 requires to adopt slow recovery diode.Capacitor C 118 forms charging circuit with resistance R 193, and its charge cycle is less than 1/2 of the communication baud rate cycle.The resistance of capacitor C 118 and resistance R 193 has determined the communication speed of MBUS.Resistance R 222 and capacitor C 118 form discharge circuit, and its discharge cycle is greater than 2 times of communication baud rate cycle.
It is to realize by controlling the voltage at stabilivolt V3 two ends that MCU sends data to MBUS.The voltage at stabilivolt V3 two ends has directly affected the 2 pin reference voltages of power conversion chip U18, causes that the voltage of output 1 pin of this conversion chip changes, thereby has reached the object that signal transmits.
Connector J2 is mbus module and table meter interface, and the consistent mode of this Interface design Cheng Yuguo net three-phase PLC module low pressure end signaling interface guarantees that two kinds of modules can be intersected to select.Connector J2 is pin type interface, and its insulation impedance is greater than 1000M Ω, contact impedance light rain 20m Ω, brass material, surface gold-plating.
MBUS and PLC module interface change-over circuit comprise optocoupler NS3, optocoupler NS4; When being connected with PLC module, this interface conversion circuit also comprises optocoupler U1.
As shown in Figure 6, while being connected with PLC module, the collector of optocoupler NS3 is connected with power supply V3P3SYS by resistance R 215, and this pin is also connected with the serial port pin UIU_RX of MCU, its emitter grounding; Its anode is connected with power supply V_485 by resistance R 219; Its negative electrode is connected with the transmission data terminal MBUS/PLC_TX of PLC module.
The anode of optocoupler NS4 is connected with power supply V3P3SYS by resistance R 191, and its negative electrode is connected with the serial port pin UIU_TX of MCU; Its collector terminal receives FPDP MBUS/PLC_RX with PLC and is connected, and this collector is also connected with power supply V_485 by resistance R 220; Its emitter grounding.The anode of optocoupler U1 is connected with power supply V3P3SYS by resistance R 7, and its negative electrode is connected with the IO pin PLC_RST of MCU, and its collector is connected with power supply V_485 by resistance R 11, and this collector is also connected with power panel by resistance R 12 resistance in series R9; Its emitter grounding.
Now, optocoupler U1 is used as PLC reset function.
As shown in Figure 7, while being connected with mbus module, the collector of optocoupler NS3 is connected with power supply V3P3SYS by resistance R 215, and this pin is also connected with the serial port pin of MCU, its emitter grounding; Its anode is connected with power supply V12 by resistance R 216; Its negative electrode is connected with the transmission data terminal MBUS/PLC_RX of mbus module, and this negative electrode is also connected with power supply V12 by resistance R 190.
The anode of optocoupler NS4 is connected with power supply V3P3SYS by resistance R 191, and its negative electrode is connected with the serial port pin UIU_TX of MCU; Its collector terminal receives FPDP MBUS/PLC_RX with MBUS and is connected; Its emitter grounding.
Now, the 4th pin of optocoupler NS4 is only used for representing earth impedance at this.
The switching of MBUS and PLC module, is mainly controlled by resistance R 216, resistance R 190, resistance R 219, resistance R 220, resistance R 9, resistance R 21.
When requiring to use PLC module, optocoupler NS3 configuration resistance R 215, resistance R 219, optocoupler NS4 configuration resistance R 191, resistance R 220, optocoupler U1 configuration resistance R 7, resistance R 11, resistance R 12 configure resistance R 9 simultaneously.If PLC module has now been installed, by optocoupler NS3, optocoupler NS4, optocoupler U1, has realized level conversion between module and MCU and communicated by letter.
When requiring to use mbus module, optocoupler NS3 configuration resistance R 216, resistance R 190, resistance R 215, optocoupler NS4 configures resistance R 191, and optocoupler U1 does not weld, and configures resistance R 21 simultaneously.By optocoupler NS3, optocoupler NS4, realize level conversion between mbus module and MCU and communicate by letter.
By the conversion of above configuration mode, can realize easily the switching between mbus module and PLC module.
As shown in Figure 8, small wireless and absorption type infrared interface change-over circuit comprise two groups of resistance, and every group of resistance comprises 2 resistance, are respectively resistance R 25 and resistance R 27, resistance R 26 and resistance R 28.
When being equipped with small wireless module, small wireless module sends data terminal and is connected with the serial port pin UIU_TX of MCU by resistance R 25, and it receives data terminal and is connected with the serial port pin UIU_RX of MCU by this group resistance R 27.
When being equipped with absorption type infrared module, the transmission data terminal OPT_TX of absorption type infrared module is connected with the serial port pin UIU_TX of MCU by resistance R 26 resistance in series R25, and it receives data terminal OPT_RX and is connected with the serial port pin UIU_RX of MCU by resistance R 28 resistance in series R27.
Through repeatedly debugging, when following configuration, small wireless and absorption try in infrared situation of communicating by letter when different, and small wireless and absorption type are infrared all can normally work, and waveform is good.
As shown in Figure 9, small wireless module and GPRS module arrangement are on logic pcb board, and mbus module or PLC module arrangement are on power supply pcb board.The mode that the utility model carries out two separate by power panel and logic card has realized the isolation of forceful electric power and weakness, improves security.
The utility model is readjusted power panel layout, utilize modular mode that PLC module and mbus module are compatible with on power panel, solution is emitted most of space on logic card, make more auxiliary functional circuit, the integrated possibility that becomes of functions such as mechanical relay control, external voltage input detection, thus make electric energy meter become a kind of flatbed table meter that truly meets multi-user, multi-functional demand.
Claims (5)
1. a three-phase and four-line electronic prepayment electric power table platform table, comprise MCU, power module, RS485 module, GPRS module, small wireless module, absorption type infrared module, also have mbus module or PLC module, it is characterized in that, this platform table also comprises RS485 and GPRS interface conversion circuit, MBUS and PLC module interface change-over circuit and small wireless and absorption type infrared interface change-over circuit; RS485 module or GPRS module are connected with the serial ports of MCU with GPRS interface conversion circuit by RS485; Small wireless module or absorption type infrared module are connected with the serial ports of MCU with absorption type infrared interface change-over circuit by small wireless; Mbus module or PLC module are connected with the serial ports of MCU with PLC module interface change-over circuit by MBUS; Power module is above-mentioned module for power supply.
2. three-phase and four-line electronic prepayment electric power table platform table according to claim 1, is characterized in that, described RS485 and GPRS interface conversion circuit comprise optocoupler U8, optocoupler U13; The cathode terminal of optocoupler U8 is connected with GPRS interface or with the receiver output terminal of RS485 interface chip, the anode of this optocoupler is connected with power supply V485 by resistance R 165, its collector is connected with power supply V3P3SYS by resistance R 162, this collector is also connected with the serial port pin of described MCU, its emitter grounding; The anode of optocoupler U13 is connected with power supply V3P3SYS by resistance R 163, and its negative electrode is connected with the serial port pin of MCU; Its collector is connected with power supply V_485 by resistance R 17 when being equipped with described GPRS module, and this pin is also connected with the pin that receives signal in GPRS interface; This collector is connected with power supply V_485 by resistance R 66 when being equipped with described RS485 module; Its emitter-base bandgap grading passes through resistance R 67 ground connection when being equipped with described GPRS module; This emitter-base bandgap grading is by resistance R 164 ground connection when being equipped with described RS485 module, and this emitter-base bandgap grading is also connected with driver output enable end and the receiver output enable end of RS485 interface chip simultaneously.
3. three-phase and four-line electronic prepayment electric power table platform table according to claim 1, is characterized in that, described MBUS and PLC module interface change-over circuit comprise optocoupler NS3, optocoupler NS4, or also comprise optocoupler U1; The collector of optocoupler NS3 is connected with power supply V3P3SYS by resistance R 215, and this pin is also connected with the serial port pin of described MCU, its emitter grounding; Its anode is connected with power supply V_485 by resistance R 219 when being connected with PLC module; This anode is connected with power supply V12 by resistance R 216 when being equipped with described mbus module; Its negative electrode is connected with the transmission data terminal of PLC module or is connected with the transmission data terminal of mbus module, and this negative electrode is also connected with power supply V12 by resistance R 190 when being equipped with described mbus module;
The anode of optocoupler NS4 is connected with power supply V3P3SYS by resistance R 191, and its negative electrode is connected with the serial port pin of described MCU; Its collector terminal is connected or receives FPDP with MBUS with PLC reception FPDP and is connected, and this collector is also connected with power supply V_485 by resistance R 220 when being equipped with described PLC module; Its emitter grounding; When being equipped with described PLC module, optocoupler U1 place in circuit, the anode of optocoupler U1 is connected with power supply V3P3SYS by resistance R 7, its negative electrode is connected with the IO port of described MCU, its collector is connected with power supply V_485 by resistance R 11, and this collector is also connected with power panel by resistance R 12 resistance in series R9; Its emitter grounding.
4. three-phase and four-line electronic prepayment electric power table platform table according to claim 1, it is characterized in that, described small wireless and absorption type infrared interface change-over circuit comprise two groups of resistance, every group of resistance comprises 2 resistance, when being equipped with small wireless module, small wireless module receives data terminal and is connected with the serial port pin A of described MCU by a resistance in a certain group of resistance, and its transmission data terminal is connected with the serial port pin B of described MCU by another resistance of this group resistance; When being equipped with absorption type infrared module, the reception data terminal of absorption type infrared module is connected with the serial port pin A of described MCU by a resistance in another group resistance, and its transmission data terminal is connected with the serial port pin B of described MCU by another resistance of this group resistance.
5. three-phase and four-line electronic prepayment electric power table platform table according to claim 1, is characterized in that, described small wireless module and GPRS module arrangement are on logic pcb board, and described mbus module or PLC module arrangement are on power supply pcb board.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420181571.5U CN203772954U (en) | 2014-04-15 | 2014-04-15 | Three-phase four-wire electronic type prepayment electric energy meter platform table |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420181571.5U CN203772954U (en) | 2014-04-15 | 2014-04-15 | Three-phase four-wire electronic type prepayment electric energy meter platform table |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105354929A (en) * | 2015-11-23 | 2016-02-24 | 成都兴联宜科技有限公司 | Three-phase four-wire electronic prepayment electric energy meter |
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2014
- 2014-04-15 CN CN201420181571.5U patent/CN203772954U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105354929A (en) * | 2015-11-23 | 2016-02-24 | 成都兴联宜科技有限公司 | Three-phase four-wire electronic prepayment electric energy meter |
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Granted publication date: 20140813 |