Solar cell volt-ampere characteristic control circuit

Abstract

The invention provides a solar cell volt-ampere characteristic control circuit. Accurately controlling and quickly scanning IV characteristic curve working points of a solar cell array is achieved based on an offset power supply and a quick-change numerical control loader. By means of the solar cell volt ampere characteristic control circuit disclosed by the invention, loader resistance can be accurately controlled, the offset power supply capable of changing along with current can be utilized, and voltage drop of loop total resistance can be offset; thus, a numerical control loader resistance valve can have a simple function relationship with the working points on the I-V curve of the cell array, and a digital quantity calculating scheme for scanning the I-V curve in a segmented mode is given out. In addition, a field-effect tube simulated resistance value can quickly scan set sections under control of the digital quantity, further voltage-current of the cell array is controlled, and voltage and current can be collected at the same time by a high-speed synchronous collector to obtain the working points on the I-V curve.

Description

technical field [0001] The invention belongs to the field of pulsed solar simulators, and relates to a solar battery volt-ampere characteristic control circuit, which realizes precise control and fast scanning of the IV characteristic curve working point of a solar battery array based on a compensation power supply and a fast-changing numerical control load. Background technique [0002] It should be understood that the volt-ampere characteristic is an important parameter for evaluating the electrical characteristics of solar cells and solar cell arrays (referred to as cell arrays). [0003] In the prior art, the commonly used measuring devices are the following two types of solar simulators: steady-state solar simulators and pulsed solar simulators. Usually, a pulsed solar simulator includes several key parts such as a pulsed xenon lamp, a pulsed power supply, a fast-changing load, and voltage-current acquisition. Among them, the fast-changing load is connected in series i...

AI Technical Summary

Problems solved by technology

[0012] 1) The compensation power supply outputs a fixed voltage, and the set value D of the load resistance does not directly correspond to the operating point of the I-V curve;

[0013] 2) The triangular wave voltage controls the load scanning, and the accurate load resistance value cannot be set;

[0014] 3) The sliding wire rheostat cannot realize program control and fast scanning;

[0015] 4) The load capacitance cannot be stabilized at the set operating point;

[0016] 5) The constant current source method is only valid in the constant voltage region of the I-V curve, and the voltage cannot be set in the constant current region

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