Photovoltaic shutdown circuit and photovoltaic system

By combining the signal receiving module and the processing module, the problem of identifying control signals at long distances in the photovoltaic shutdown circuit is solved, the inverter ripple interference is shielded, and the stable and reliable operation of the photovoltaic shutdown circuit is achieved, meeting safety requirements.

CN115693924BActive Publication Date: 2026-06-09NINGBO GUANGJING TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO GUANGJING TECH CO LTD
Filing Date
2022-09-30
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing photovoltaic shutdown circuits have difficulty correctly identifying control signals at distances of over 300 meters and are severely affected by inverter ripple interference, leading to unstable operation.

Method used

The system employs a signal receiving module, a signal processing module, and a controllable switch module, including a signal modulation unit, a threshold comparison unit, and a controllable switch. Through signal modulation, amplification, delay, and filtering, interference signals are shielded to ensure that the photovoltaic shutdown circuit can correctly identify the control signal.

Benefits of technology

The photovoltaic shutdown circuit has achieved stable and reliable operation at a distance of over 300 meters, effectively avoiding the influence of interference signals and ensuring the safety and reliability of the system.

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    Figure CN115693924B_ABST
Patent Text Reader

Abstract

The application discloses a photovoltaic shutdown device circuit, which comprises a shutdown device power line, a signal receiving module, a signal processing module and a controllable switch module; the signal processing module comprises a signal modulation unit and a threshold comparison unit; the switch end of the controllable switch module is connected in series in the shutdown device power line; the signal receiving module is connected with the shutdown device power line to receive a first signal with a control signal; the signal modulation unit is used for restoring the control signal; the threshold comparison unit is connected with the signal modulation unit to receive the processed control signal and compare the processed control signal with a set threshold value to output a driving signal; and the controllable switch module is connected with the threshold comparison unit to receive the driving signal to control the on-off of the controllable switch module. The photovoltaic shutdown device circuit can correctly identify the control signal generated by a control signal generator which is more than 300 meters away from the photovoltaic shutdown device circuit, and effectively avoid the influence of interference signals on the control of the photovoltaic shutdown device circuit. The application further provides a photovoltaic system.
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