Current detection circuit of LCL type photovoltaic grid-connected inverter

• Main Authors: ZHONG FEI, ZHANG HONG, CHANG XUEFEI, ZHANG YUNBO, LIU YANG, SUN YUEXING, LIANG CHUNHUI, ZHENG WEN
• Format: Patent
• Language: Chinese; English
• Published: 03.12.2019
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The utility model discloses a current detection circuit of an LCL type photovoltaic grid-connected inverter. The method is characterized in that the method is characterized by comprising the followingsteps; the current output end of the grid-connected inverter is connected with the current input end of a current sensor; the current sensor detects and amplifies a flowing current signal; the voltage is output to the voltage division circuit; after voltage division, the signals flow into an amplifier; the current signal further amplified by the amplifier is output to the two voltage comparators;wherein the voltage comparator is used for comparing two directions of an alternating current signal, the compared signal is sent to the wiring terminal strip through the resistor and the voltage stabilizing diode, and the wiring terminal strip is connected with a microprocessor of the grid-connected inverter and sends a detected current signal to the microprocessor of the grid-connected inverter. Compared with the tradit