CN204008829U - A kind of line voltage zero cross detection circuit - Google Patents
A kind of line voltage zero cross detection circuit Download PDFInfo
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- CN204008829U CN204008829U CN201420384745.8U CN201420384745U CN204008829U CN 204008829 U CN204008829 U CN 204008829U CN 201420384745 U CN201420384745 U CN 201420384745U CN 204008829 U CN204008829 U CN 204008829U
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Abstract
The utility model relates to photovoltaic power generation technology field, especially a kind of line voltage zero cross detection circuit.It comprises LV25-P type voltage sensor Q for being connected with electrical network and the two Schmidt's negative circuits that end pin is connected of catching for control chip; Voltage sensor+HT end pin by the first resistance of series connection is connected with electrical network ,-HT end pin by the second resistance of series connection is connected with electrical network, the ground connection adjustable resistance of positive terminal by series connection is connected with the in-phase end of voltage comparator and pass through the 4th resistance eutral grounding that the second capacity earth that the first capacity earth, negative pole end pass through to connect, the 3rd resistance that M holds pin to pass through to connect are connected with the end of oppisite phase of voltage comparator and pass through to connect; Between the in-phase end of voltage comparator and output terminal, be in series with the first adjustable resistance, the output of voltage comparator connects two Schmidt's negative circuits.The utlity model has circuit structure simple, be applicable to be applied to the TMS320F240 type fixed-point type DSP chip in photovoltaic inverting system, there is very strong practicality.
Description
Technical field
The utility model relates to photovoltaic power generation technology field, especially a kind of line voltage zero cross detection circuit for TMS320F240 type fixed-point type DSP chip.
Background technology
In today of energy growing tension, photovoltaic power generation technology more and more comes into one's own, the direct current that solar cell and aerogenerator produce need to and reach regulation through inverter inversion and require ability grid-connected, therefore, the design of inverter concerns the operation that can photovoltaic system reasonable, efficient, economic.
And TMS320F240 is the fixed-point type DSP chip of American TI Company, its structural drawing as shown in Figure 1, hardware structure be take 16 as master data processing unit, integrated High Performance DSP kernel, and there is abundant peripheral functionality, as the peripheral circuit of DSP kernel comprises circuit, reset circuit, power circuit etc. all the time, processing speed is very fast; At present, the chip of this model has been applied in photovoltaic inverting system, to utilize the characteristic of this chip to reach the requirements such as Waveform Control to inversion system, width modulation, emergency protection.
In the application of TMS320F240 type control chip, after inversion, the voltage of alternating current must be with line voltage homophase, with ability is grid-connected frequently, therefore, need to carry out phase-locked control to output voltage, because the voltage signal of exporting is sinusoidal wave, and control chip can only be identified Transistor-Transistor Logic level signal, therefore need a circuit that sine wave signal is converted to the Transistor-Transistor Logic level signal that control chip can be identified.
Utility model content
For the deficiencies in the prior art, the purpose of this utility model is to provide a kind of circuit structure simple, the line voltage zero cross detection circuit designing for TMS320F240 type fixed-point type DSP chip.
To achieve these goals, the utility model adopts following technical scheme:
A line voltage zero cross detection circuit, it comprises LV25-P type voltage sensor Q for being connected with electrical network and the two Schmidt's negative circuits that end pin is connected of catching for control chip;
Described voltage sensor+HT end pin by the first resistance of series connection is connected with electrical network ,-HT end pin by the second resistance of series connection is connected with electrical network, the ground connection adjustable resistance of positive terminal by series connection is connected with the in-phase end of voltage comparator and pass through the 4th resistance eutral grounding that the second capacity earth that the first capacity earth, negative pole end pass through to connect, the 3rd resistance that M holds pin to pass through to connect are connected with the end of oppisite phase of voltage comparator and pass through to connect;
Between the in-phase end of described voltage comparator and output terminal, be in series with the first adjustable resistance, the output of described voltage comparator connects two Schmidt's negative circuits.
Owing to having adopted such scheme, the utlity model has circuit structure simple, be applicable to be applied to the TMS320F240 type fixed-point type DSP chip in photovoltaic inverting system, there is very strong practicality.
Accompanying drawing explanation
Fig. 1 is the theory diagram of TMS320F240 type fixed-point type DSP chip;
Fig. 2 is the circuit structure diagram of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 2, the line voltage zero cross detection circuit of the present embodiment, it comprises LV25-P type voltage sensor Q for being connected with electrical network and the two Schmidt's negative circuits 1 that end pin is connected of catching for TMS320F240 type fixed-point type DSP chip; Wherein, voltage sensor Q+HT end pin by the first resistance R 1 of series connection is connected with electrical network ,-HT end pin by the second resistance R 2 of series connection is connected with electrical network, the ground connection adjustable resistance R10 of positive terminal by series connection is connected with the in-phase end of voltage comparator V and pass through the 4th resistance R 4 ground connection that the second capacitor C 2 ground connection that the first capacitor C 1 ground connection, negative pole end passes through to connect, the 3rd resistance R 3 that M holds pin to pass through to connect are connected with the end of oppisite phase of voltage comparator V and pass through to connect; Between the in-phase end of voltage comparator V and output terminal, be in series with the first adjustable resistance R10, the output terminal of voltage comparator V connects two Schmidt's negative circuits 1.
Voltage sensor Q converts the line voltage collecting and the equiphase low voltage pulse signal of line voltage to, after over-voltage comparator V, exporting one group can be with the low pressure Transistor-Transistor Logic level signal of line voltage homophase (when detected line voltage surpasses zero point, export high level), low pressure Transistor-Transistor Logic level signal is delivered to catching on end pin of control chip through two Schmidt's negative circuits by signal, thereby make the control chip interruption of setting out when rising edge being detected, and then complete the phase-locked of output voltage.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model instructions and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (1)
1. a line voltage zero cross detection circuit, is characterized in that: it comprises LV25-P type voltage sensor for being connected with electrical network and the two Schmidt's negative circuits that end pin is connected of catching for control chip;
Described voltage sensor+HT end pin by the first resistance of series connection is connected with electrical network ,-HT end pin by the second resistance of series connection is connected with electrical network, the ground connection adjustable resistance of positive terminal by series connection is connected with the in-phase end of voltage comparator and pass through the 4th resistance eutral grounding that the second capacity earth that the first capacity earth, negative pole end pass through to connect, the 3rd resistance that M holds pin to pass through to connect are connected with the end of oppisite phase of voltage comparator and pass through to connect;
Between the in-phase end of described voltage comparator and output terminal, be in series with the first adjustable resistance, the output of described voltage comparator connects two Schmidt's negative circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420384745.8U CN204008829U (en) | 2014-07-12 | 2014-07-12 | A kind of line voltage zero cross detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420384745.8U CN204008829U (en) | 2014-07-12 | 2014-07-12 | A kind of line voltage zero cross detection circuit |
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| Publication Number | Publication Date |
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| CN204008829U true CN204008829U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420384745.8U Expired - Fee Related CN204008829U (en) | 2014-07-12 | 2014-07-12 | A kind of line voltage zero cross detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852567A (en) * | 2015-05-20 | 2015-08-19 | 常州信息职业技术学院 | Totem-pole bridgeless power factor correction circuit of soft switch |
-
2014
- 2014-07-12 CN CN201420384745.8U patent/CN204008829U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852567A (en) * | 2015-05-20 | 2015-08-19 | 常州信息职业技术学院 | Totem-pole bridgeless power factor correction circuit of soft switch |
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| 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 |
Granted publication date: 20141210 Termination date: 20180712 |
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| CF01 | Termination of patent right due to non-payment of annual fee |