CN203191431U - Direct-current component sampling circuit of photovoltaic inverter - Google Patents
Direct-current component sampling circuit of photovoltaic inverter Download PDFInfo
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- CN203191431U CN203191431U CN 201320120554 CN201320120554U CN203191431U CN 203191431 U CN203191431 U CN 203191431U CN 201320120554 CN201320120554 CN 201320120554 CN 201320120554 U CN201320120554 U CN 201320120554U CN 203191431 U CN203191431 U CN 203191431U
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Abstract
The utility model relates to a sampling circuit and especially relates to a direct-current component sampling circuit of a photovoltaic inverter. The direct-current component sampling circuit comprises an inverter alternating current sampling module, the inverter alternating current sampling module is connected with a filtering and amplifying module, and the filtering and amplifying module is composed of two cascaded second-order low-pass filters. By adopting the structure, the active filtering and amplifying module is added in the direct-current component sampling circuit, and a grid-connected direct-current component can be accurately sampled. Meanwhile, as the Butterworth second-order low-pass filters are adopted, the higher the fidelity of low-frequency detection signals, the more sufficient the attenuation of high-frequency signals.
Description
Technical field
The utility model relates to a kind of sample circuit, particularly a kind of sample circuit of photovoltaic DC-to-AC converter DC component.
Background technology
The DC component of electric current can not overrate when distributed power source was incorporated into the power networks 0.5%.In large-power occasions, grid-connected current is easy to satisfy, but for miniature inverter, grid-connected current is less, and for example when specified 250W and 230V AC network, the maximum current DC component only is 5.4mA.This just needs the accurately DC component of sampling grid-connected current, and is controlled by electric current loop.
There is not special DC component sample circuit in traditional miniwatt photovoltaic combining inverter, perhaps only extract the DC component of grid-connected current by simple RC filtering, these ways are in can satisfy distributed power source when exporting near rated power and be incorporated into the power networks the time requirement to current dc component at inverter, but under the situation of lower-wattage operation, because the defective of sampling precision does not often reach requirement.
Summary of the invention
The utility model technical issues that need to address provide a kind of sample circuit of miniwatt photovoltaic DC-to-AC converter DC component.
For solving above-mentioned technical matters, photovoltaic DC-to-AC converter DC component sample circuit of the present utility model comprises inverter alternating current sampling module, be connected with the filtering amplification module behind the described inverter alternating current sampling module, described filtering amplification module is the second-order low-pass filter of two cascades.
Described second-order low-pass filter is the Butterworth second-order low-pass filter.
Described inverter alternating current sampling module is D.C mutual-inductor.
Described filtering amplification module output terminal is connected with the amplifier for voltage follow, and described filtering amplification module output terminal also is connected with the bias voltage input end.
The output terminal of described amplifier is connected with the DSP control module by phase inverter.
After adopting said structure, the utility model has increased the active power filtering amplification module, realizes the accurate sampling to the DC component that is incorporated into the power networks.Simultaneously, adopt the Butterworth second-order low-pass filter, the fidelity of low frequency detection signal is more high, and the high-frequency signal decay is more abundant.
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.
Among the figure: 1 is inverter alternating current sampling module, and 2 is the Butterworth second-order low-pass filter, and 3 is amplifier, and 4 is the bias voltage input end, and 5 is phase inverter, and 6 is DSP control module link
Embodiment
As shown in Figure 1, photovoltaic DC-to-AC converter DC component sample circuit of the present utility model comprises inverter alternating current sampling module 1, and inverter alternating current sampling module 1 of the present utility model is D.C mutual-inductor.Because the value of DC component is very little in miniature inverter, be difficult to detect.For the miniature inverter DC component of can accurately sampling, just the inverter alternating current need be filtered into direct current, then this direct current signal is amplified convenient the detection.So be connected with the filtering amplification module behind the described inverter alternating current sampling module 1, described filtering amplification module is the second-order low-pass filter of two cascades.
Described second-order low-pass filter is Butterworth second-order low-pass filter 2 because the output signal amplitude of Butterworth filter dullness reduces along with the rising of frequency, be a kind of corresponding low-pass filter of maximally-flat amplitude that has.The exponent number of Butterworth filter is more high, and more near desirable low-pass filter, the fidelity of low frequency signal is more high, and the high-frequency signal decay is more abundant.Consider side circuit of the present utility model, adopt two Butterworths to hang down the second-order low-pass filter cascade, be equivalent to the quadravalence low-pass filter.
Further, in order to make the output voltage of filtering amplification module can satisfy the requirement of DSP control module voltage input, described filtering amplification module output terminal is connected with the amplifier 3 for voltage follow, described filtering amplification module output terminal also is connected with bias voltage input end 4, at the bias voltage of bias voltage input end 4 adding 1.65V, so just can be so that the output signal of filtering amplification module can satisfy the input requirement of DSP control module.
Further, in order better to detect DC component, the output terminal of described amplifier 3 is connected with phase inverter 5, the output signal of filtering amplification module is connected with DSP control module link 6 by phase inverter 5 after having added bias voltage like this, is convenient to the DSP control module and better detects DC component.
Claims (5)
1. a photovoltaic DC-to-AC converter DC component sample circuit comprises inverter alternating current sampling module, it is characterized in that: be connected with the filtering amplification module behind the described inverter alternating current sampling module, described filtering amplification module is the second-order low-pass filter of two cascades.
2. according to the described photovoltaic DC-to-AC converter DC component of claim 1 sample circuit, it is characterized in that: described second-order low-pass filter is the Butterworth second-order low-pass filter.
3. according to the described photovoltaic DC-to-AC converter DC component of claim 1 sample circuit, it is characterized in that: described inverter alternating current sampling module is D.C mutual-inductor.
4. according to the described photovoltaic DC-to-AC converter DC component of claim 1 sample circuit, it is characterized in that: described filtering amplification module output terminal is connected with the amplifier for voltage follow, and described filtering amplification module output terminal also is connected with the bias voltage input end.
5. according to the described photovoltaic DC-to-AC converter DC component of claim 4 sample circuit, it is characterized in that: the output terminal of described amplifier is connected with the DSP control module by phase inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320120554 CN203191431U (en) | 2013-03-17 | 2013-03-17 | Direct-current component sampling circuit of photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320120554 CN203191431U (en) | 2013-03-17 | 2013-03-17 | Direct-current component sampling circuit of photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203191431U true CN203191431U (en) | 2013-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320120554 Expired - Fee Related CN203191431U (en) | 2013-03-17 | 2013-03-17 | Direct-current component sampling circuit of photovoltaic inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203191431U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649683A (en) * | 2018-05-21 | 2018-10-12 | 清华四川能源互联网研究院 | Power supply system and operation power system |
-
2013
- 2013-03-17 CN CN 201320120554 patent/CN203191431U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649683A (en) * | 2018-05-21 | 2018-10-12 | 清华四川能源互联网研究院 | Power supply system and operation power system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130911 Termination date: 20180317 |