Hualian optocouplers are widely used in applications of new energy field, covering core equipments such as photovoltaic inverter, BMS, and energy storage/wind energy converter, etc. Among them, the gate drive optocouplers are used in the topology circuit of inverters and converters (PCS) to drive power devices like IGBT/MOSFET and protect the main control chips and low-voltage components. The high-speed optocouplers are used for isolation of various communication interfaces (RS485, I2C, I/O port, etc); Isolation amplifiers achieve high-precision detection of input/output voltage and current in inverters and converters. Compared to other types of isolation devices(capacitive/magnetic isolators), optocouplers have significant advantages in insulation safety performance, making them more suitable for high voltage applications like optical storage.