| 摘要 |
The utility model relates to a power module protective device, which is used for protecting a built-in switching element (4) in a power module (2) arranged on a cooling fin. The power module protective device comprises an element temperature sensor (6), a fin temperature sensor (5) and a microcomputer (9) (action limiting circuit), wherein the element temperature sensor (6) is internally arranged in the power module (2) and used for detecting the temperature of the built-in switching element (4) in the power module (2); the fin temperature sensor (5) is used for detecting the temperature of the cooling fin; and the microcomputer (9) (action limiting circuit) can find out the temperature difference between the element temperature detected by the element temperature sensor (6) and the fin temperature detected by the fin temperature sensor (5), and can generate an action limiting instruction (11a) which limits the action of the switching element (4) and output the action limiting instruction (11a) to a driving circuit (12) of the switching element (4). |
