| 摘要 |
A projector includes an apparatus casing, a light source module, a flow generating device, a sensing module, and a power module. The light source module is disposed inside the apparatus casing and includes a light-emitting part and a lampshade surrounding the light-emitting part. The flow generating device can generate an air flow for dissipating heat by the light source module. The sensing module is disposed in the apparatus casing and includes a thermo-sensitive component disposed near the lampshade and located in a flowing path of the air flow. The power module is disposed in the apparatus casing and electrically connected to the light source module and the sensing module. The power module selectively stops powering the light source module according to an electric parameter of the thermo-sensitive component. Thereby, the invention protects the projector from being overheated by use of the thermo-sensitivity of the thermo-sensitive component. |
| 主权项 |
1. A projector, comprising:
an apparatus casing; a light source module, the light source module being disposed in the apparatus casing and comprising a light-emitting part and a lampshade surrounding the light-emitting part; a flow generating device for generating an air flow, the air flow flowing through the apparatus casing and dissipating heat produced by the light source module; a sensing module, the sensing module being disposed in the apparatus casing and comprising a thermo-sensitive component, the thermo-sensitive component being disposed adjacent to the lampshade and being located in a flowing path of the air flow; and a power module, the power module being disposed in the apparatus casing and electrically connected to the light source module and the sensing module, the power module selectively stopping powering the light source module according to an electric parameter of the thermo-sensitive component; wherein the power module comprises a circuit board, the thermo-sensitive component is disposed on the circuit board, the sensing module is integrated into the power module and comprises a first voltage divider circuit, a second voltage divider circuit, and a comparator, the first voltage divider circuit is formed by a first component and a second component, the second voltage divider circuit is formed by a third component and the thermo-sensitive component, the comparator comprises a first pin, a second pin, and a third pin, the first pin is an output end of the comparator, the first voltage divider circuit is coupled to the second pin, and the second voltage divider circuit is coupled to the third pin; wherein when a resistance of the thermo-sensitive component is larger than a resistance of the second component, the output end of the comparator is at a high voltage level, and the power module powers the light source module; wherein when the resistance of the thermo-sensitive component is lower than the resistance of the second component, the output end of the comparator is at a low voltage level, and the power module does not power the light source module. |
