Inverter is a converter that converts direct current (battery, battery) into constant frequency and voltage or frequency and voltage regulated alternating current (generally 220 V, 50 Hz sine wave). It is composed of inverter bridge, control logic and filter circuit. It is widely used in air conditioners, 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, when working or traveling, inverters can be used to connect batteries to drive electrical appliances and various tools to work. The on-board inverter output through the cigarette lighter is 20W, 40W, 80W, 120W to 150W. Connect household appliances to the output end of the power converter to use all kinds of appliances in the car. The electric appliances that can be used include: mobile phones, laptops, digital cameras, cameras, lighting lamps, electric shavers, CD players, game consoles, handheld computers, electric tools, car refrigerators and various kinds of travel, camping, medical emergency appliances, etc.
According to different power sources, inverters are divided into coal power inverter, solar power inverter, wind power inverter and nuclear power inverter. According to different purposes, it can be divided into independent control inverter and grid-connected inverter.
In addition to power and waveform, the efficiency of the inverter is also important. The higher the efficiency, the less energy wasted on the inverter, and more energy will be used for electrical appliances, especially when using low-power systems.
逆变器是把直流电能（电池、蓄电瓶）转变成定频定压或调频调压交流电（一般为220伏,50赫兹正弦波）的转换器。由逆变桥、控制逻辑和滤波电路组成。广泛适用于空调、家庭影院、电动砂轮、电动工具、缝纫机、DVD、VCD、电脑、电视、洗衣机、抽油烟机、冰箱、录像机、按摩器、风扇、照明等。因汽车的普及率较高，外出工作或外出旅游时，即可用逆变器连接蓄电池带动电器及各种工具工作。通过点烟器输出的车载逆变是20瓦、40瓦、80瓦、120瓦到150瓦 功率。把家用电器连接到电源转换器的输出端就能在汽车内使用各种电器。可使用的电器有：手机、笔记本电脑、数码摄像机、照像机、照明灯、电动剃须刀、CD机、游戏机、掌上电脑、电动工具、车载冰箱及各种旅游、野营、医疗急救电器等。
根据电源的不同，逆变器分为煤电逆变器、太阳能逆变器、风电逆变器和核电逆变器。根据用途不同，可分为独立控制逆变器和并网逆变器。
除了功率和波形，逆变器的效率也很重要。效率越高，浪费在逆变器上的能量就越少，更多的能量将用于电器，尤其是使用低功率系统时。