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Signal Analysis and Control Method of Operational Amplifier Input Pin in Photovoltaic Inverter Grid Sampling

A signal analysis method and photovoltaic inverter technology, which is applied in the field of control and input pin signal analysis of operational amplifiers (ie, operational amplifiers, operational amplifiers), and can solve problems such as operational amplifiers exceeding the safe voltage range

Active Publication Date: 2020-07-31
爱士惟科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this relatively high-precision circuit parameter for grid voltage sampling may have the risk of exceeding the safe voltage range for the input pin of the operational amplifier in the circuit when considering the influence of the grid voltage alone and the system common-mode voltage under various working conditions.

Method used

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  • Signal Analysis and Control Method of Operational Amplifier Input Pin in Photovoltaic Inverter Grid Sampling
  • Signal Analysis and Control Method of Operational Amplifier Input Pin in Photovoltaic Inverter Grid Sampling
  • Signal Analysis and Control Method of Operational Amplifier Input Pin in Photovoltaic Inverter Grid Sampling

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Embodiment 1

[0027] figure 1 Shown is a fully differential grid voltage sampling circuit of a non-isolated photovoltaic inverter. This embodiment aims to provide a method for evaluating and analyzing the input pin signal of an operational amplifier in the grid voltage sampling circuit. The input pin signal analysis method of the operational amplifier in the fully differential sampling circuit of the grid voltage of the non-isolated photovoltaic inverter includes: quantifying and equivalenting the grid voltage and system common-mode voltage to the voltage acting on the input pin of the operational amplifier, and constructing an operational amplifier The signal safety model that the input pin of the device is affected by the grid voltage and the system common mode voltage; figure 1 The equivalent of the sampling circuit in is figure 2 signal security model. In this signal safety model, the effect of grid voltage and system common-mode voltage on the input pin of the operational amplifier ...

Embodiment 2

[0031] Based on the analysis method of Embodiment 1, this embodiment provides a grid voltage sampling circuit of a non-isolated photovoltaic inverter and a signal control method for an input pin of an operational amplifier in the grid voltage sampling circuit. Such as image 3 shown in figure 1In the grid voltage sampling circuit of the non-isolated photovoltaic inverter shown, an adjusting resistor R3 is introduced, and the adjusting resistor R3 is respectively introduced into the two input pins of the operational amplifier. Then, the grid voltage and system common-mode voltage are quantified and equivalent to the voltage acting on the input pin of the op amp, and a signal safety model is constructed in which the input pin of the op amp is affected by the grid voltage and system common-mode voltage. For example, image 3 The sampling circuit shown after introducing the adjusting resistor R3 is equivalent to Figure 4 The safety signal model of the input pin of the op amp is...

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Abstract

The invention discloses a non-isolated photovoltaic inverter operational amplifier input pin signal analysis method. The acting voltage of the power grid voltage and the system common-mode voltage tothe operational amplifier input pin is quantified and equivalent and a signal safety model of the operational amplifier input pin under the effect of the power grid voltage and the system common-modevoltage is constructed, and the equivalent input signal of the operational amplifier input pin is acquired so as to judge whether the input voltage exceeds the safety input voltage range. Accordingly,the invention also discloses a non-isolated photovoltaic inverter operational amplifier input pin signal control method. The adjusting resistor R3 is introduced to the power grid voltage sampling circuit of the non-isolated photovoltaic inverter to be equivalent, and the value of the adjusting resistor R3 is adjusted and the equivalent input signal of the operational amplifier input pin is enabled to be within the safety voltage range so that the possible risk of exceeding the safety voltage range of the input pin can be effectively eliminated, and the voltage sampling accuracy of the non-isolated inverter power grid voltage sampling circuit can also be guaranteed.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to a signal analysis and control method for an input pin of an operational amplifier (that is, an operational amplifier, referred to as an operational amplifier in the present invention) in a grid voltage sampling circuit of a non-isolated photovoltaic inverter. Background technique [0002] Under the global background of energy shortage and environmental degradation, the use of new clean energy is particularly important. Solar energy is widely developed and applied due to its renewable and abundant resources. [0003] The current photovoltaic power generation technology is relatively mature, but with the increase in field application of products and the accumulation of time, some problems that were originally ignored have emerged relatively, and have received the attention of the industry. In the grid voltage sampling circuit of the non-isolated photovoltaic inverter, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
CPCG01R19/0084
Inventor 王晓龙卢盈包有鹏廖小俊
Owner 爱士惟科技股份有限公司