AC current filtering and sampling circuit of photovoltaic inverter

A photovoltaic inverter and filter sampling technology, applied in photovoltaic power generation, measuring current/voltage, voltage/current isolation, etc., can solve problems such as instability, affecting detection results, and misoperation, so as to improve accuracy and stability performance, stable filter function, and reliable protection function

Inactive Publication Date: 2016-03-02
LIAONING ELECTRIC POWER DEV
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  • Claims
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Problems solved by technology

[0002] At present, there are many kinds of AC current sampling circuits in photovoltaic inverters, but most of them do not have too many requirements for clutter filtering. If the AC current contains too much high-frequency clutter, it may affect the photovoltaic inverter. The detection accuracy of the device to the current
The photovoltaic inverter itself is composed of switching devices (IGBT). When it works, it will generate a lot of high-frequency clutter, high-frequency noise, etc. If there is no special treatment for current sampling, it will affect the instability of the detection results. , which may result in downtime, malfunction and other consequences

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Embodiment Construction

[0018] In order to enable the examiner to further understand the structure, features and other purposes of the present invention, the attached preferred embodiments are attached with accompanying drawings in detail as follows. The embodiments illustrated in the accompanying drawings are only used to illustrate the technical solution of the present invention , not to limit the present invention.

[0019] First, please refer to figure 1 , figure 1 It is a circuit diagram of the filter sampling circuit of the alternating current of the photovoltaic inverter of the present invention. Such as figure 1 As shown, the photovoltaic inverter AC current filter sampling circuit of the present invention includes three parts: the current conversion sampling circuit I, the active filter circuit II and the output protection circuit III. First, the current on the AC side of the inverter passes through the current conversion sampling circuit I, convert the small current signal output by the ...

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Abstract

The invention provides an AC current filtering and sampling circuit of a photovoltaic inverter. The AC current filtering and sampling circuit comprises a current conversion sampling circuit, an active filtering circuit and an output protective circuit. The current conversion sampling circuit comprises an alternating current transformer and a sampling resistor. The active filtering circuit comprises a second resistor, a third resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, and an operational amplifier chip. The output protective circuit comprises an anti-surge tube, a sixth resistor and an AD chip pin. The filtering and sampling circuit accords with the original design standard, and has the advantages of high accuracy, stability and safety.

Description

technical field [0001] The invention belongs to the technical field of new energy equipment, and in particular relates to a photovoltaic inverter AC current sampling circuit. Background technique [0002] At present, there are many kinds of AC current sampling circuits in photovoltaic inverters, but most of them do not have too many requirements for clutter filtering. If the AC current contains too much high-frequency clutter, it may affect the photovoltaic inverter. The detection accuracy of the device to the current. The photovoltaic inverter itself is composed of switching devices (IGBT). When it works, it will generate a lot of high-frequency clutter, high-frequency noise, etc. If there is no special treatment for current sampling, it will affect the instability of the detection results. , which may result in downtime, malfunction and other consequences. Therefore, there is an urgent need to find a sampling circuit that can improve the accuracy and overall stability of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/18G01R19/25H02M1/00
CPCY02E10/56
Inventor 李春东全凤岐白挺玮张志毅薛思萌黄川关士深宇宁
Owner LIAONING ELECTRIC POWER DEV
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