CN220190832U - Multi-head direct current clamp signal converter - Google Patents
Multi-head direct current clamp signal converter Download PDFInfo
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- CN220190832U CN220190832U CN202321630047.7U CN202321630047U CN220190832U CN 220190832 U CN220190832 U CN 220190832U CN 202321630047 U CN202321630047 U CN 202321630047U CN 220190832 U CN220190832 U CN 220190832U
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Abstract
The utility model discloses a multi-head direct current clamp signal converter which comprises a signal conversion module, a signal summarizing module and a digital-to-analog conversion module, wherein a plurality of signal conversion modules are connected with the input end of the signal summarizing module, the output end of the signal summarizing module is connected with the input end of the digital-to-analog conversion module, and the output end of the digital-to-analog conversion module is connected with photovoltaic inverter efficiency testing equipment; the signal conversion module comprises a direct current clamp and an analog-to-digital conversion circuit, wherein the output end of the direct current clamp is connected with the input end of the analog-to-digital conversion circuit, and the output end of the analog-to-digital conversion circuit is connected with the input end of the signal summarizing module. The utility model provides a multi-head direct current clamp signal converter which is used for converting multiple current signals of a direct current side of a centralized photovoltaic inverter into one signal, so that the total current of the direct current side of the centralized photovoltaic inverter can be measured by photovoltaic inverter efficiency test equipment through only one interface.
Description
Technical Field
The utility model relates to a multi-head direct current clamp signal converter.
Background
The photovoltaic inverter is an inverter capable of converting variable direct current voltage generated by the photovoltaic solar panel into alternating current with mains frequency, and can be fed back to a commercial power transmission system or used for an off-grid power grid. The photovoltaic inverter is one of important system balances in a photovoltaic array system, and can be used with common alternating current power supply equipment.
At present, the common inverters in the market mainly comprise a centralized inverter and a serial inverter, and the centralized inverter is used for converting the total direct current into alternating current, so that the power of the inverter is relatively large, and the centralized inverter with the power of more than 500KW is generally adopted in a photovoltaic power station.
In order to reduce the power loss during conversion, the inverter needs to continuously increase efficiency, typically around 96%. The photovoltaic inverter efficiency test equipment can detect inverter efficiency, and the mainstream photovoltaic inverter efficiency test equipment on the market at present generally adopts 1 to 2 direct current pincers, and current collection has 4 hole sites, and 3 alternating current pincers occupy 3 hole sites, and direct current pincers occupy 1 hole site, and the multichannel direct current that leads to a photovoltaic inverter efficiency test equipment to not gather the dc of dc-to-ac converter simultaneously. The efficiency requirement of the test inverter is the total current of the direct current side, and the direct current side of the existing centralized photovoltaic inverter has 8 to 16 paths of terminals, so that the existing main stream photovoltaic inverter efficiency test equipment cannot meet the test requirement.
Disclosure of Invention
The technical problem to be solved by the utility model is to overcome the defects of the prior art, and provide the multi-head direct current clamp signal converter which converts multiple current signals of the inlet end of the direct current side of the centralized photovoltaic inverter into one signal, so that the photovoltaic inverter efficiency test equipment can measure the total current of the direct current side of the centralized photovoltaic inverter only by one interface.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
the multi-head direct current clamp signal converter comprises a signal conversion module, a signal summarizing module and a digital-to-analog conversion module, wherein a plurality of signal conversion modules are connected with the input end of the signal summarizing module, the output end of the signal summarizing module is connected with the input end of the digital-to-analog conversion module, and the output end of the digital-to-analog conversion module is connected with the efficiency test equipment of the photovoltaic inverter;
the signal conversion module comprises a direct current clamp and an analog-to-digital conversion circuit, wherein the output end of the direct current clamp is connected with the input end of the analog-to-digital conversion circuit, and the output end of the analog-to-digital conversion circuit is connected with the input end of the signal summarizing module.
Further, the signal conversion module further comprises a voltage amplification circuit, wherein the input end of the voltage amplification circuit is connected with the output end of the direct current clamp, and the output end of the voltage amplification circuit is connected with the input end of the analog-to-digital conversion circuit.
Further, the direct current clamp is sleeved on a direct current side line of the centralized photovoltaic inverter.
Further, the signal summarizing module comprises an MCU chip and a crystal oscillator circuit, wherein the crystal oscillator circuit is connected with the MCU chip.
Further, the model of the MCU chip is STM32F101VET6.
Further, the power supply circuit is used for supplying power to the whole multi-head direct current clamp signal converter.
By adopting the technical scheme, the direct current side line current of the photovoltaic inverter is collected through the plurality of direct current clamps with the same type, then the voltage signal is output, the voltage signal is amplified and converted through the voltage amplifying circuit and the analog-to-digital conversion circuit, the total value is obtained through addition of the signal summarizing modules, finally the total voltage analog signal is output to the photovoltaic inverter efficiency testing equipment after the signal summarizing modules pass through the digital-to-analog conversion modules, and the total current can be obtained through self-conversion of the photovoltaic inverter efficiency testing equipment. The direct-current side inlet and outlet total current detection circuit is simple and practical in structure and high in practicability.
Drawings
FIG. 1 is a schematic block diagram of a multi-headed DC-to-DC clamp signal converter of the present utility model;
FIG. 2 is a schematic circuit diagram of a voltage amplifying circuit according to the present utility model;
FIG. 3 is a schematic circuit diagram of an analog-to-digital conversion circuit of the present utility model;
FIG. 4 is a schematic circuit diagram of a signal summarizing module of the present utility model;
fig. 5 is a schematic circuit diagram of the power supply circuit of the present utility model.
Detailed Description
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1, this embodiment provides a multi-head dc clamp signal converter, which includes a signal conversion module, a signal summarizing module and a digital-to-analog conversion module, where a plurality of signal conversion modules are all connected with an input end of the signal summarizing module, an output end of the signal summarizing module is connected with an input end of the digital-to-analog conversion module, and an output end of the digital-to-analog conversion module is connected with a photovoltaic inverter efficiency test device. For example, there are 16 paths on the direct current side of the centralized photovoltaic inverter, and 16 signal conversion modules are correspondingly arranged.
As shown in fig. 1, the signal conversion module of this embodiment includes a dc clamp, a voltage amplifying circuit and an analog-to-digital conversion circuit, where the dc clamp is connected to an input end of the voltage amplifying circuit, an output end of the voltage amplifying circuit is connected to an input end of the analog-to-digital conversion circuit, and an output end of the analog-to-digital conversion circuit is connected to an input end of the signal summarizing module.
The direct current clamp sleeves the direct current side of the centralized photovoltaic inverter, induces the electric flux, then outputs voltage signals, and the voltage signals output by the direct current clamp of the same type sequentially pass through a voltage amplifying circuit, an analog-to-digital conversion circuit, a signal summarizing module and a digital-to-analog conversion module to enter an interface of the photovoltaic inverter efficiency testing equipment, and the photovoltaic inverter efficiency testing equipment automatically converts the total current to obtain the total current. The voltage signals output by the direct current clamps with the same type are added in the signal summarizing module after signal conversion, and then the total voltage signals are output to the photovoltaic inverter efficiency testing equipment after the digital-to-analog conversion module, and the total current can be obtained through self-conversion of the photovoltaic inverter efficiency testing equipment.
As shown in fig. 2, the dc clamp of the present embodiment is of the type CT7742, and since the voltage signal output by the dc clamp is small, voltage amplification is required before the analog-to-digital conversion, and the voltage amplification circuit of the present embodiment adopts the op amp chip U3, and the type OPA2333.
As shown in fig. 3, the analog-to-digital conversion module of the present embodiment is configured to convert a voltage analog signal into a digital signal for use by the MCU chip of the signal summarizing module, where the analog-to-digital conversion module adopts an analog-to-digital conversion chip U2, and the model is AD7606BSTZ.
As shown in fig. 4, the signal summarizing module of the embodiment includes an MCU chip and a crystal oscillator circuit, the crystal oscillator circuit is connected with the MCU chip, the model of the MCU chip is STM32F101VET6, and 3.3V power is adopted, and the signal summarizing module is provided with a floating point operation unit, processes sampling data in real time, and can implement high-speed processing for adding multiple paths of signals. The digital-to-analog conversion module of the embodiment can adopt a digital-to-analog conversion chip DAC8734SPFBR of TI company to convert the voltage digital signal into an analog signal and output the analog signal to an analog quantity interface of the photovoltaic inverter efficiency test equipment.
As shown in fig. 5, the power supply circuit of the present embodiment is used for supplying power to the whole multi-head dc clamp signal converter, the model of the power supply chip U4 is TLV70433, and the 5V input power is converted into 3.3V for each module.
The technical problems, technical solutions and advantageous effects solved by the present utility model have been further described in detail in the above-described embodiments, and it should be understood that the above-described embodiments are only illustrative of the present utility model and are not intended to limit the present utility model, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present utility model should be included in the scope of protection of the present utility model.
Claims (6)
1. A multi-head DC clamp signal converter is characterized in that: the photovoltaic inverter efficiency testing device comprises a signal conversion module, a signal summarizing module and a digital-to-analog conversion module, wherein a plurality of signal conversion modules are connected with the input end of the signal summarizing module, the output end of the signal summarizing module is connected with the input end of the digital-to-analog conversion module, and the output end of the digital-to-analog conversion module is connected with photovoltaic inverter efficiency testing equipment;
the signal conversion module comprises a direct current clamp and an analog-to-digital conversion circuit, wherein the output end of the direct current clamp is connected with the input end of the analog-to-digital conversion circuit, and the output end of the analog-to-digital conversion circuit is connected with the input end of the signal summarizing module.
2. The multi-headed dc pliers signal converter of claim 1 wherein: the signal conversion module further comprises a voltage amplification circuit, wherein the input end of the voltage amplification circuit is connected with the output end of the direct current clamp, and the output end of the voltage amplification circuit is connected with the input end of the analog-to-digital conversion circuit.
3. The multi-headed dc pliers signal converter of claim 1 wherein: the direct current clamp is sleeved on a direct current side line of the centralized photovoltaic inverter.
4. The multi-headed dc pliers signal converter of claim 1 wherein: the signal summarizing module comprises an MCU chip and a crystal oscillator circuit, and the crystal oscillator circuit is connected with the MCU chip.
5. The multi-headed dc pliers signal converter of claim 4 wherein: the model of the MCU chip is STM32F101VET6.
6. The multi-headed dc pliers signal converter of claim 1 wherein: the power supply circuit is used for supplying power to the whole multi-head direct current clamp signal converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321630047.7U CN220190832U (en) | 2023-06-26 | 2023-06-26 | Multi-head direct current clamp signal converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321630047.7U CN220190832U (en) | 2023-06-26 | 2023-06-26 | Multi-head direct current clamp signal converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220190832U true CN220190832U (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321630047.7U Active CN220190832U (en) | 2023-06-26 | 2023-06-26 | Multi-head direct current clamp signal converter |
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| CN (1) | CN220190832U (en) |
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2023
- 2023-06-26 CN CN202321630047.7U patent/CN220190832U/en active Active
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