Temperature protection circuit

The utility model provides a temperature protection circuit, including drive unit, comparing element and detecting element, wherein: drive unit includes voltage follower and connector, the connector is including the output that is used for exporting an output voltage, voltage follower is used for with temperature changes and exports different control by temperature change voltage, comparing element includes the comparator, the output of comparator is used for producing control voltage, voltage follower links to each other with the inverting input end of comparator, the reference voltage who is decided by control voltage and output voltage is received to the non -inverting input termination of comparator, the comparator is used for doing the comparison with control by temperature change voltage with reference voltage, and then controls the control voltage that its output was exported, detecting element is used for accepting control voltage to whether switch on according to this control voltage control. Above -mentioned temperature protection circuit simple structure and cost are lower.