Noise generation circuit, self-check circuit, AFCI and photovoltaic power generation system

Abstract

The invention provides a noise generation circuit, a self-check circuit, an AFCI and a photovoltaic power generation system. The noise generation circuit comprises a power switch module, a noise generator and a capacitor; the noise generator is connected with the power switch module and the capacitor; the power switch module controls the noise generator to or not to generate a noise signal according to a self-check instruction; and the capacitor filters DC components from the noise signal when the noise generator generates the noise signal. According to the invention, noise signals are not generated beyond the self-check time, influence on the AFCI in the working state as well as on devices in a photovoltaic inverter in which the AFCI is arranged can be avoided, and normal work of the AFCI and the photovoltaic inverter are ensured.

Description

technical field [0001] Embodiments of the present invention relate to power supply technology, in particular to a noise generating circuit, a self-test circuit, an arc fault circuit interrupter (Arc Fault Circuit Interrupter: AFCI for short) and a photovoltaic power generation system. Background technique [0002] Photovoltaic power generation system is a power generation system that converts solar energy into electrical energy. In view of the advantages of photovoltaic power generation system, such as long service life, no pollution to the environment, independent power generation and grid-connected operation, more and more places choose to use photovoltaic power generation system as a power supply. At present, the above-mentioned photovoltaic power generation system is mainly composed of multiple solar panels, photovoltaic inverters, etc., wherein the solar panels and photovoltaic inverters are connected through cables and terminals. [0003] In the prior art, the above-m...

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Problems solved by technology

[0005] Embodiments of the present invention provide a noise generating circuit, a self-inspection circuit, an AFCI, and a photovoltaic power generation system, which are used to solve the problem of whether the self-inspection circuit in the AFCI is in the state of testing whether the function of the detection circuit is normal in the prior art. The noise generating circuit in the system will continue to generate noise signals, which will affect the devices in the working AFCI and the devices in the photovoltaic inverter where the AFCI is located, resulting in the failure of AFCI and photovoltaic inverters to work normally. question

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