An inverter is a device that converts direct current energy (batteries, storage batteries) into current (usually 220V, 50Hz sine wave). It consists of an inverter bridge, control logic, and filtering circuit. Widely used in air conditioning, home theaters, electric grinding wheels, electric tools, sewing machines, DVDs, VCDs, computers, televisions, washing machines, range hoods, refrigerators, video recorders, massagers, fans, lighting, etc. Due to the high popularity of automobiles abroad, inverters can be used to connect batteries to drive electrical appliances and various tools when working or traveling. The on-board inverter output through the cigarette lighter has power specifications of 20W, 40W, 80W, 120W to 150W. A higher power inverter power supply needs to be connected to the battery through a connecting cable. Connecting household appliances to the output end of the power converter enables the use of various appliances in the car. Available appliances include mobile phones, laptops, digital video cameras, cameras, lights, electric razors, CD players, game consoles, personal digital assistant, electric tools, car refrigerators, and various travel, camping, medical emergency appliances.