Overheat protection device and method of inverter

The invention relates to an overheat protection device and method of an inverter. The overheat protection method comprises the following steps of: detecting real-time temperature of a power device of the inverter in the operation process; judging whether the real-time temperature is greater than a first preset temperature; and if so, boosting the maximum power tracking output voltage to the right side of a maximum power point of a P-V curve, carrying out amplitude-limiting on active current giving and reducing the active current giving, wherein the output power of the inverter is reduced by reduction of the active current giving so that the temperature of the power device is reduced. When a first judgment module judge that the real-time temperature is less than the first preset temperature, the detection module continues detect. The overheat protection device and method disclosed by the invention have the advantages of capabilities of carrying out rapid control on the temperature in real time, avoiding larger fluctuation of the output power of the inverter, controlling the output power of the inverter to be zero without poweroff and effectively prolonging the grid-connected generation time of the inverter.