CN203519723U - Wide range DC electric energy meter - Google Patents
Wide range DC electric energy meter Download PDFInfo
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- CN203519723U CN203519723U CN201320652533.9U CN201320652533U CN203519723U CN 203519723 U CN203519723 U CN 203519723U CN 201320652533 U CN201320652533 U CN 201320652533U CN 203519723 U CN203519723 U CN 203519723U
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- 238000005070 sampling Methods 0.000 claims abstract description 87
- 238000004891 communication Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 30
- 230000001052 transient effect Effects 0.000 claims description 9
- 230000001419 dependent effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The utility model discloses a wide range DC electric energy meter comprising a communication module, a switch quantity module, a transmitter module, an electric quantity pulse module, a button and display module, a storage module, an SOC chip, a DC current sampling module, a DC voltage sampling module, and a working power supply module. The output end of the DC current sampling module is connected with the input end of the SOC chip. The output end of the DC voltage sampling module is connected with the input end of the SOC chip. The working power supply module supplies power for the SOC chip. According to the wide range DC electric energy meter, the signal values of voltage, current, power, electric quantity and the like of a DC power grid can be collected, 0 to 300mV current divider input of a DC current input signal is supported, and 0 to 1200V input of a DC voltage signal is supported. Since an SOC scheme is employed by the utility model, the number of components is greatly reduced, the cost is reduced, and the operation speed and the anti-interference ability are obviously raised.
Description
Technical field
The utility model relates to a kind of direct current energy meter, particularly a kind of wide-range direct current energy meter.
Background technology
In recent years, the new forms of energy such as sun power, wind-powered electricity generation and electric automobile are in the fast-developing phase, but the environment of its use is also very complicated: DC voltage input range changes from tens volts to more than thousand volts, the shunt millivolt signal of DC current changes to hundreds of millivolt from zero, working power also has 220VAC, 110VDC etc. multiple, and environmental interference is also very large.Due to market just rise and new nation's standard also in drafting, so new direct current energy meter product is also in the starting stage, all there is larger defect in existing product: as DC voltage, input only has the single specifications such as 220V, the millivolt signal of DC current only has the single specification of 75mV, and working power also can only be inputted civil power 220VAC.
In addition, the scheme that existing product adopts is AD chip+computation chip+managing chip, and this scheme cost is very high, and anti-interference is poor.
Utility model content
The purpose of this utility model is to provide a kind of low cost and highly reliable wide-range direct current energy meter.
This wide-range direct current energy meter that the utility model provides, comprises communication module, switching value module, transmitter module, electric pulse module, button and display module, memory module, SOC chip, DC current sampling module, DC voltage sampling module and working power module; The output terminal of DC current sampling module is connected with the input end of SOC chip, the input end of the output terminal of DC voltage sampling module and SOC chip connects, working power module is SOC chip power supply, and SOC chip is also connected with memory module with display module with communication module, switching value module, transmitter module, electric pulse module, button respectively.
Described SOC chip adopts single-chip microcomputer.
Described DC current sampling module comprises the first protection branch road, build-out resistor RA and the first filter branch; The first protection branch road comprises a transient suppressor T1, and transient suppressor T1 is connected to the two ends of DC current sampling end; Build-out resistor RA and transient suppressor T1 are connected in the two ends of DC current sampling end; The first filter branch comprises resistance R 26, resistance R 27, capacitor C 22, capacitor C 20 and capacitor C 27, resistance R 26 is connected between the positive input terminal and corresponding DC current sampling output terminal thereof of DC current sampling end, and resistance R 27 is connected between the negative input end and corresponding DC current sampling output terminal thereof of DC current sampling end; After capacitor C 22 and capacitor C 20 series connection, be connected between the two ends of DC current sampling output terminal, tie point place ground connection in the middle of this two electric capacity, capacitor C 27 is connected between the two ends of DC current sampling output terminal, and this DC current sampling output terminal is connected with the analog input end of described SOC chip.
Described DC voltage sampling module comprises the second protection branch road, the second step-down branch road and the second filter branch; The second protection branch road comprises voltage dependent resistor (VDR) RV2, inductance L V+ and inductance L V-, and voltage dependent resistor (VDR) RV2 is connected to the two ends of DC voltage sampling end, and the anode of DC voltage sampling end is connected with inductance L V+ again, and the negative terminal of DC voltage sampling end is connected with inductance L V-; The second step-down branch road comprises divider resistance RV16 and divider resistance R30; The second filter branch comprises that resistance R 31, resistance R 29, capacitor C 25, capacitor C 23 are the same with the circuit structure of described the first filter branch with capacitor C 29, the second filter branch; After DC voltage sampling end is connected with the second protection branch road; be linked into again the second step-down branch road; the second filter branch is connected between the second reduction voltage circuit and DC voltage sampling output terminal, and this DC voltage sampling output terminal is connected with the analog input end of described SOC chip.
Described working power module adopts switching power circuit, and it comprises the one chip switching power source chip that a model is TNY268.
The utlity model has wide-range, high-precision feature; Can gather the signal value such as voltage, electric current, power, electric weight of direct current network; DC current input signal is supported the input of 0 ~ 300mV shunt, and d. c. voltage signal is supported 0 ~ 1200V input.Because the utility model adopts SOC scheme, significantly reduced component number, reduce volume, reduce costs, significantly improve travelling speed and antijamming capability.
Accompanying drawing explanation
Fig. 1 is functional block diagram of the present utility model.
Fig. 2 is a kind of embodiment circuit diagram of the utility model SOC chip.
Fig. 3 is a kind of embodiment circuit diagram of DC current sampling module of the present utility model.
Fig. 4 is a kind of embodiment circuit diagram of DC voltage sampling module of the present utility model.
Fig. 5 is a kind of embodiment circuit diagram of working power module of the present utility model.
Embodiment
As shown in Figure 1, the utility model comprises communication module, switching value module, transmitter module, electric pulse module, button and display module, memory module, SOC chip, DC current sampling module, DC voltage sampling module and working power module.The output terminal of DC current sampling module is connected with the input end of SOC chip, the input end of the output terminal of DC voltage sampling module and SOC chip connects, working power module is SOC chip power supply, and SOC chip is also connected with memory module with display module with communication module, switching value module, transmitter module, electric pulse module, button respectively.
Wide-range direct current voltage signal (plurality of specifications such as 48V, 100 V, 220 V, 400 V, 600 V, 1000V) enters DC voltage sampling module, wide region DC current signal (0 ~ 300mV) enters DC current sampling module; Signal by DC voltage sampling module and the collection of DC current sampling module is delivered to SOC chip through overprotection, step-down, filtering after processing, by SOC chip, the signal of input is carried out to the processing such as AD sampling, then generate voltage, electric current, power, electric weight, the data such as pulse of gaining merit after calibration; Electric quantity data is saved in memory module in real time, guarantees that electric energy meter power failure data do not lose, thereby reaches the metering to direct current energy.Meritorious pulse is externally exported by electric pulse module.
Communication module is supported Modbus and DL/T645 communication protocol, can pass through the various parameters of communication setting electric energy meter, and the electrical parameter values such as the positive and negative direct current energy of copy reading, DC voltage, DC current, DC power.This communication module can access in other communication network easily, forms a complete energy source monitoring system.
Button and display module comprise liquid crystal display and button, can show the various data such as electric weight, voltage, electric current, power.
Switching value module comprises 2 way switch amount inputs and the output of 2 way switch amounts.
Transmitter module comprises 1 ~ 4 road transmitter output function (4 ~ 20mA, 0 ~ 20mA, 0 ~ 24mV, 0 ~ 5V, 0 ~ 10V gear optional).
As shown in Figure 2, SOC chip is comprised of single-chip, this integrated chip the function of AD chip, computation chip, managing chip.SOC chip of the present utility model can adopt MSP430427 series monolithic chip.
As shown in Figures 2 and 3, DC current sampling module comprises the first protection branch road, build-out resistor RA and the first filter branch.
The first protection branch road comprises a transient suppressor T1, and transient suppressor T1 is connected to the two ends of DC current sampling end; Build-out resistor RA and transient suppressor T1 are connected in the two ends of DC current sampling end; The first filter branch comprises resistance R 26, resistance R 27, capacitor C 22, capacitor C 20 and capacitor C 27, resistance R 26 is connected between the positive input terminal and corresponding DC current sampling output terminal thereof of DC current sampling end, and resistance R 27 is connected between the negative input end and corresponding DC current sampling output terminal thereof of DC current sampling end; After capacitor C 22 and capacitor C 20 series connection, be connected between the two ends of DC current sampling output terminal, tie point place ground connection in the middle of this two electric capacity, capacitor C 27 is connected between the two ends of DC current sampling output terminal, the DC current sampling anode I+ of output terminal and 4 pin of SOC chip are connected, and this DC current sampling negative terminal I-of output terminal and 5 pin of SOC chip are connected.
DC current sampling module possesses the wide region DC current signal acquisition capacity of 0 ~ 300mV.
As shown in Figure 2 and Figure 4, DC voltage sampling module comprises the second protection branch road, the second step-down branch road and the second filter branch.
The second protection branch road comprises voltage dependent resistor (VDR) RV2, inductance L V+ and inductance L V-, and voltage dependent resistor (VDR) RV2 is connected to the two ends of DC voltage sampling end, and the anode of DC voltage sampling end is connected with inductance L V+ again, and the negative terminal of DC voltage sampling end is connected with inductance L V-; The second step-down branch road comprises divider resistance RV16 and divider resistance R30; The second filter branch comprises that resistance R 31, resistance R 29, capacitor C 25, capacitor C 23 are the same with the circuit structure of the first filter branch with capacitor C 29, the second filter branch; After DC voltage sampling end is connected with the second protection branch road; be linked into again the second step-down branch road; the second filter branch is connected between the second reduction voltage circuit and DC voltage sampling output terminal; the DC voltage sampling anode V1+ of output terminal and 6 pin of SOC chip are connected, and this DC voltage sampling negative terminal V1-of output terminal and 7 pin of SOC chip are connected.
DC voltage sampling module possesses the ability of the wide-range direct current voltage signals collecting of the multiple voltage specifications such as 48V, 100 V, 220 V, 400 V, 600 V, 1000V.
DC current sampling module and DC voltage sampling module can be worked simultaneously, also can work independently.The signal of these two functional module collections reaches SOC chip through overprotection, step-down, filtering after processing.
As shown in Figure 5, working power module adopts switching power circuit, comprises a Switching Power Supply, can under 40 ~ 420V alternating voltage or direct supply, work, and output 3.3V, 5V, 12V voltage.
It is the chip of TNY268 that working power module can adopt model.
Claims (5)
1. a wide-range direct current energy meter, comprise communication module, switching value module, transmitter module, electric pulse module, button and display module and memory module, it is characterized in that, also comprise SOC chip, DC current sampling module, DC voltage sampling module and working power module; The output terminal of DC current sampling module is connected with the input end of SOC chip, the input end of the output terminal of DC voltage sampling module and SOC chip connects, working power module is SOC chip power supply, and SOC chip is also connected with memory module with display module with communication module, switching value module, transmitter module, electric pulse module, button respectively.
2. wide-range direct current energy meter according to claim 1, is characterized in that, described SOC chip adopts single-chip microcomputer.
3. wide-range direct current energy meter according to claim 1, is characterized in that, described DC current sampling module comprises the first protection branch road, build-out resistor RA and the first filter branch; The first protection branch road comprises a transient suppressor T1, and transient suppressor T1 is connected to the two ends of DC current sampling end; Build-out resistor RA and transient suppressor T1 are connected in the two ends of DC current sampling end; The first filter branch comprises resistance R 26, resistance R 27, capacitor C 22, capacitor C 20 and capacitor C 27, resistance R 26 is connected between the positive input terminal and corresponding DC current sampling output terminal thereof of DC current sampling end, and resistance R 27 is connected between the negative input end and corresponding DC current sampling output terminal thereof of DC current sampling end; After capacitor C 22 and capacitor C 20 series connection, be connected between the two ends of DC current sampling output terminal, tie point place ground connection in the middle of this two electric capacity, capacitor C 27 is connected between the two ends of DC current sampling output terminal, and this DC current sampling output terminal is connected with the analog input end of described SOC chip.
4. wide-range direct current energy meter according to claim 1, is characterized in that, described DC voltage sampling module comprises the second protection branch road, the second step-down branch road and the second filter branch; The second protection branch road comprises voltage dependent resistor (VDR) RV2, inductance L V+ and inductance L V-, and voltage dependent resistor (VDR) RV2 is connected to the two ends of DC voltage sampling end, and the anode of DC voltage sampling end is connected with inductance L V+ again, and the negative terminal of DC voltage sampling end is connected with inductance L V-; The second step-down branch road comprises divider resistance RV16 and divider resistance R30; The second filter branch comprises resistance R 31, resistance R 29, capacitor C 25, capacitor C 23 and capacitor C 29, resistance R 31 is connected between the positive input terminal and corresponding DC voltage sampling output terminal thereof of DC voltage sampling end, and resistance R 29 is connected between the negative input end and corresponding DC voltage sampling output terminal thereof of DC voltage sampling end; After capacitor C 25 and capacitor C 23 series connection, be connected between the two ends of DC voltage sampling output terminal, tie point place ground connection in the middle of this two electric capacity, capacitor C 29 is connected between the two ends of DC voltage sampling output terminal, and this DC voltage sampling output terminal is connected with the analog input end of described SOC chip; After DC voltage sampling end is connected with the second protection branch road; be linked into again the second step-down branch road; the second filter branch is connected between the second reduction voltage circuit and DC voltage sampling output terminal, and this DC voltage sampling output terminal is connected with the analog input end of described SOC chip.
5. wide-range direct current energy meter according to claim 1, is characterized in that, described working power module adopts switching power circuit, and it comprises the one chip switching power source chip that a model is TNY268.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320652533.9U CN203519723U (en) | 2013-10-23 | 2013-10-23 | Wide range DC electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320652533.9U CN203519723U (en) | 2013-10-23 | 2013-10-23 | Wide range DC electric energy meter |
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| CN203519723U true CN203519723U (en) | 2014-04-02 |
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| CN201320652533.9U Expired - Lifetime CN203519723U (en) | 2013-10-23 | 2013-10-23 | Wide range DC electric energy meter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526313A (en) * | 2016-12-05 | 2017-03-22 | 湖南威胜信息技术有限公司 | DC metering method |
| CN107315156A (en) * | 2017-08-09 | 2017-11-03 | 浙江涵普电力科技有限公司 | High-accuracy direct current standard electric energy meter |
| CN107422182A (en) * | 2017-06-14 | 2017-12-01 | 珠海中慧微电子股份有限公司 | Direct current energy meter |
| CN108594011A (en) * | 2018-05-08 | 2018-09-28 | 浙江正泰仪器仪表有限责任公司 | The sample circuit of electronic electric energy meter |
| CN112082694A (en) * | 2019-06-14 | 2020-12-15 | 北京振兴计量测试研究所 | Power supply and signal acquisition device for pressure sensor |
-
2013
- 2013-10-23 CN CN201320652533.9U patent/CN203519723U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526313A (en) * | 2016-12-05 | 2017-03-22 | 湖南威胜信息技术有限公司 | DC metering method |
| CN107422182A (en) * | 2017-06-14 | 2017-12-01 | 珠海中慧微电子股份有限公司 | Direct current energy meter |
| CN107315156A (en) * | 2017-08-09 | 2017-11-03 | 浙江涵普电力科技有限公司 | High-accuracy direct current standard electric energy meter |
| CN107315156B (en) * | 2017-08-09 | 2024-04-16 | 浙江涵普电力科技有限公司 | High-precision direct-current standard electric energy meter |
| CN108594011A (en) * | 2018-05-08 | 2018-09-28 | 浙江正泰仪器仪表有限责任公司 | The sample circuit of electronic electric energy meter |
| CN112082694A (en) * | 2019-06-14 | 2020-12-15 | 北京振兴计量测试研究所 | Power supply and signal acquisition device for pressure sensor |
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