| 摘要 |
<p>A thermal protection device for a motor driven by a PWM signal outputted from a controller comprises an overheating detecting module which includes a temperature sensor attached to a temperature measuring point and outputs an overheating detection result signal on the basis of the temperature measured by the temperature sensor. The controller has a first terminal for receiving a controlling signal and a second terminal for outputting the PWM signal. The controller stops outputting the PWM signal at the second terminal, when the controlling signal is uncoupled from the first terminal. The thermal protection device further comprises a switching element (SW41, SW51, SW61, SW71, SW81) which is coupled to the first terminal of the controller and receives the overheating detection result signal from the overheating detecting module to selectively couple or uncouple the controlling signal to or from the first terminal.</p> |
