1. A heat dissipation system for a digital electronic signboard having a first heat dissipation subsystem and a second heat dissipation subsystem, comprising:
the first heat dissipation subsystem being disposed in a main circuit board area of a digital electronic signboard, the main circuit board area having at least two heat dissipation fans disposed therein, wherein one heat dissipation fan is appropriately disposed at a side of the main circuit board area, while another heat dissipation fan is disposed at a side of a power supply, and the heat dissipation fan disposed at the side of the power supply can be externally connected to an air guide pipe;
the second heat dissipation subsystem being disposed in a computer mainboard area of the digital electronic signboard; the computer mainboard area having at least two heat dissipation fans disposed therein, wherein one heat dissipation fans is appropriately disposed at a side of the computer mainboard, while another heat dissipation fan is disposed on the top of a microprocessor of the computer mainboard, the heat dissipation system for the digital electronic signboard is thus formed by the above mentioned heat dissipation subsystems.
2. The heat dissipation system for the digital electronic signboard of claim 1, wherein the first heat dissipation subsystem and the second heat dissipation subsystem are separated by a partition board.
3. The heat dissipation system for the digital electronic signboard of claim 1, wherein the first heat dissipation subsystem and the second heat dissipation subsystem are covered by a back cover, and the back cover comprises multiple rows of heat dissipation holes disposed thereon.
4. The heat dissipation system for the digital electronic signboard of claim 3, wherein some of the rows of heat dissipation holes on the back cover are disposed with respect to places where the heat dissipation subsystems and the air guide pipe exhaust air.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A streetlight system for illuminating a road surface, comprising:
an illuminating device having a light source for selectively providing a lower illumination brightness or a higher illumination brightness;
an infrared detection device configured for detecting a vehicle or a passerby on the road surface and generating a detection signal associated therewith; and
a controlling device configured for controlling the light source to provide the higher illumination brightness according to the detection signal, wherein the light source comprises a plurality of light emitting diodes, the light emitting diodes are connected in a manner such that only part of the light emitting diodes can be switched on to provide the lower illumination brightness and all of the light emitting diodes are switched on to provide the higher illumination brightness.
2. A streetlight system for illuminating a road surface, comprising:
an illuminating device having a light source for selectively providing a lower illumination brightness or a higher illumination brightness;
an infrared detection device configured for detecting a vehicle or a passerby on the road surface and generating a detection signal associated therewith; and
a controlling device configured for controlling the light source to provide the higher illumination brightness according to the detection signal, wherein the infrared detection device comprises an environmental temperature measuring module and an infrared temperature sensing module, the environmental temperature measuring module being configured for measuring an environmental temperature, the infrared temperature sensing module being configured for sensing the temperature of the atmosphere around the road surface, the infrared detection device generating the detecting signal if the temperature of the atmosphere around the road surface is higher than the environmental temperature, the controlling device configured for generating a controlling signal to control the light source to provide the higher illumination brightness.
3. The streetlight system according to claim 2, wherein the environmental temperature measuring module comprises a heat responsive element and a temperature measuring circuit, the heat responsive element has a resistance variable according to the environmental temperature, the temperature measuring circuit being electrically connected to the controlling device for measuring the environmental temperature according to the resistance of the heat responsive element.