CN203275514U - Electric energy production metering device for photovoltaic inverter - Google Patents
Electric energy production metering device for photovoltaic inverter Download PDFInfo
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- CN203275514U CN203275514U CN 201320121846 CN201320121846U CN203275514U CN 203275514 U CN203275514 U CN 203275514U CN 201320121846 CN201320121846 CN 201320121846 CN 201320121846 U CN201320121846 U CN 201320121846U CN 203275514 U CN203275514 U CN 203275514U
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- computation chip
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Abstract
The utility model relates to an electric energy production metering device, and particularly relates to an electric energy production metering device for a photovoltaic inverter. The electric energy production metering device comprises an electric energy metering chip, wherein an input end of the electric energy metering chip is connected to a phase current detection unit and a phase voltage detection unit, and an output end of the electric energy metering chip is connected with a system main chip MCU. According to the structure provided by the utility model, the high-precision electric energy metering chip is adopted, and information such as the electric energy production and the like of the photovoltaic grid-connected inverter can be metered accurately by applying the electric energy production metering device to the photovoltaic grid-connected inverter, thereby reflecting the advantages of solar grid-connected electric energy generation more intuitively and more accurately.
Description
Technical field
The utility model relates to a kind of generated energy measuring apparatus, particularly a kind of photovoltaic DC-to-AC converter generated energy measuring apparatus.
Background technology
In photovoltaic combining inverter, main MCU periodically carries out Sample point collection to parameters such as the voltage that is incorporated into the power networks, electric currents, calculates corresponding effective value by the Fourier scheduling algorithm, power, the real-time information such as generated energy.Due to the instability of sun power, the power that is incorporated into the power networks often changes, and often there is very large deviation in the information such as the generated energy that calculates, can not accurately reflect the generated energy of photovoltaic combining inverter, exists the inaccurate problem of metering.
Summary of the invention
The utility model technical issues that need to address are to provide a kind of device of energy accurate-metering photovoltaic DC-to-AC converter generated energy.
For solving above-mentioned technical matters, the utility model photovoltaic DC-to-AC converter generated energy measuring apparatus comprises electric energy computation chip, the input end of described electric energy computation chip is connected with respectively phase current detecting unit and phase voltage detecting unit, and described electric energy computation chip output terminal is connected with system master chip MCU.
Described phase current detecting unit comprises current transformer, and the two ends of described current transformer are connected with the series circuit of the first resistance and the second resistance, described two resistance intermediate connection point ground connection, and the other two ends of described two resistance are connected with electric energy computation chip respectively.
Described phase voltage detecting unit comprises the 3rd resistance that is connected between single-phase output terminal and neutral point and the series circuit of the 4th resistance, and described the 3rd resistance is connected with electric energy computation chip respectively with neutral point with the intermediate connection point of the 4th resistance.
The output terminal of system master chip MCU is connected with touch-screen.
After adopting said structure, the utility model adopts high precision electric energy computation chip, it is applied in photovoltaic combining inverter, can measures accurately the information such as generated energy of photovoltaic combining inverter, more intuitively embodied accurately the advantage of solar grid-connected generating.
Description of drawings
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of the utility model phase current detecting unit.
Fig. 3 is the structural scheme of mechanism of the utility model phase voltage detecting unit.
In figure: 1 is system master chip MCU, and 2 is electric energy computation chip, and 3 is the phase current detecting unit, and 4 is the phase voltage detecting unit, and 5 is touch-screen, and 6 is current transformer, and 7 is single-phase output terminal, and 8 is neutral point
Embodiment
As shown in Figure 1, the utility model photovoltaic DC-to-AC converter generated energy measuring apparatus comprises electric energy computation chip 2, the input end of described electric energy computation chip 2 is connected with respectively phase current detecting unit 3 and phase voltage detecting unit 4, and described electric energy computation chip 2 output terminals are connected with system master chip MCU1.Electric energy computation chip 2 of the present utility model adopts ADE7878.
As shown in Figure 2, described phase current detecting unit comprises current transformer 6, the two ends of described current transformer 6 are connected with the series circuit of the first resistance R 1 and the second resistance R 2, described two resistance intermediate connection point ground connection, the other two ends of described two resistance are connected with the IAN end with the IAP of electric energy computation chip ADE7878 respectively.Because the current transformer of selecting 6 is a kind of current mode CT, output signal is electric current, is converted to voltage through resistance, then accesses electric energy computation chip 2 input ends.
As shown in Figure 3, described phase voltage detecting unit comprises the 3rd resistance R 3 that is connected between single-phase output terminal 7 and neutral point 8 and the series circuit of the 4th resistance R 4, and described the 3rd resistance R 3 is connected with the VAN end with the VAP of electric energy computation chip 2 respectively with neutral point with the intermediate connection point of the 4th resistance R 4.
Electric energy computation chip of the present utility model detects respectively electric current and voltage by phase current detecting unit and phase voltage detecting unit, then transfers data to system master chip MCU by calculating again.Use like this electric energy computation chip can reduce peripheral circuit as the sampling module of photovoltaic DC-to-AC converter, design processes simplified improves the integrated level of system.Simultaneously, utilize electric energy computation chip self computing function, can alleviate the computational burden of MCU.The high precision characteristic of electric energy computation chip can guarantee the accuracy of measurement result.
Further, in order to embody intuitively the benefit of photovoltaic generation, the output terminal of system master chip MCU1 is connected with touch-screen 5.MCU reaches touch-screen to data by 485 interfaces, and the benefit of photovoltaic generation is presented on touch-screen.
Claims (4)
1. photovoltaic DC-to-AC converter generated energy measuring apparatus, it is characterized in that: comprise electric energy computation chip, the input end of described electric energy computation chip is connected with respectively phase current detecting unit and phase voltage detecting unit, and described electric energy computation chip output terminal is connected with system master chip MCU.
2. according to photovoltaic DC-to-AC converter generated energy measuring apparatus claimed in claim 1, it is characterized in that: described phase current detecting unit comprises current transformer, the two ends of described current transformer are connected with the series circuit of the first resistance and the second resistance, described two resistance intermediate connection point ground connection, the other two ends of described two resistance are connected with electric energy computation chip respectively.
3. according to photovoltaic DC-to-AC converter generated energy measuring apparatus claimed in claim 1, it is characterized in that: described phase voltage detecting unit comprises the 3rd resistance that is connected between single-phase output terminal and neutral point and the series circuit of the 4th resistance, and described the 3rd resistance is connected with electric energy computation chip respectively with neutral point with the intermediate connection point of the 4th resistance.
4. according to the described photovoltaic DC-to-AC converter generated energy of any one in claims 1 to 3 measuring apparatus, it is characterized in that: the output terminal of system master chip MCU is connected with touch-screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320121846 CN203275514U (en) | 2013-03-17 | 2013-03-17 | Electric energy production metering device for photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320121846 CN203275514U (en) | 2013-03-17 | 2013-03-17 | Electric energy production metering device for photovoltaic inverter |
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| Publication Number | Publication Date |
|---|---|
| CN203275514U true CN203275514U (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320121846 Expired - Fee Related CN203275514U (en) | 2013-03-17 | 2013-03-17 | Electric energy production metering device for photovoltaic inverter |
Country Status (1)
| Country | Link |
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| CN (1) | CN203275514U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870974A (en) * | 2016-06-21 | 2016-08-17 | 南京工程学院 | Bidirectional measurement device of electric quantity parameters of distributed photovoltaic grid-connected system |
| CN111044768A (en) * | 2018-10-15 | 2020-04-21 | 大陆汽车有限责任公司 | Method for operating a current sensor and current sensor |
-
2013
- 2013-03-17 CN CN 201320121846 patent/CN203275514U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870974A (en) * | 2016-06-21 | 2016-08-17 | 南京工程学院 | Bidirectional measurement device of electric quantity parameters of distributed photovoltaic grid-connected system |
| CN105870974B (en) * | 2016-06-21 | 2018-07-03 | 南京工程学院 | Distributed photovoltaic grid-connected system electrical parameter bidirectional measurement device |
| CN111044768A (en) * | 2018-10-15 | 2020-04-21 | 大陆汽车有限责任公司 | Method for operating a current sensor and current sensor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20180317 |