Inverter detection method and inverter

• Main Authors: WU CHAO, DENG CHAO, YU YANFEI, QU HENG, LI KECHENG
• Format: Patent
• Language: Chinese; English
• Published: 03.05.2024
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to an inverter detection circuit and method. The inverter comprises an inverter circuit, a neutral line and a voltage applying circuit, the input side of the inverter circuit is provided with a bus midpoint, the neutral line is connected with the bus midpoint of the inverter circuit and the grounding end of the grid-connected side, the neutral line is provided with a specified relay, the specified relay is used for controlling connection and disconnection of the neutral line, and the voltage applying circuit is connected with the bus midpoint. The method comprises the following steps: controlling a voltage applying circuit to apply a detection voltage to a neutral line during a self-checking period before grid connection of an inverter; under the condition that the specified relay is controlled to be switched on or switched off, sampling characteristic parameter values corresponding to sampling voltages are obtained, and the sampling voltages are voltages at the two ends of the specified