Patent Application
20140042906
1. Technical Field
The present disclosure relates to an energy-saving illumination device having a human body sensing module, and particularly to an energy-saving illumination device capable of sensing the proximity of a human body to automatically turn on or off the illumination device or adjust a brightness of the illumination device.
2. Description of Related Art
An illumination device capable of sensing the presence of a human body may be used to save energy. The energy-saving illumination device employs an infrared sensor to control a light source of the illumination device. The illumination device having a human body sensing module can be used in places where continuous illumination is not needed, such as an aisle or staircase. When a human body approaches, the illumination device is turned on. When a human body is not present, the illumination device is turned off. Thus, the illumination device is capable of saving energy.
However, such a human body sensing device is integrally formed with a light tube or a bulb. The light tube or a bulb may include a plurality of LED members, which are durable and have a long lifespan. Thus, when either the illumination device or the light tube or bulb is damaged, the entire illumination device is required to be replaced, which results in a waste of resources, a high repair cost, and environmental pollution.
Therefore, there is room for improvement in the art.
The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout several views.
If the energy-saving illumination device 1 is used in a room (not shown), when someone enters the room, the infrared sensing unit 40 senses the thermal radiation 100 and the driving control unit 50 controls the light source 20 to turn on the light source 20. When the someone leaves the room, the infrared sensing unit 40 detects the lack of thermal radiation 100, and the driving control unit 50 controls the light source 20 to turn off the light source 20 or decrease an illumination intensity to a residual amount to save energy. For example, when a person leaves the room, the light source 20 can decrease the illumination intensity by fifty percent in one embodiment.
In the illustrated embodiment, the light source 20 is an LED light source, and includes an LED light tube or bulb consisting of a plurality of LED modules arranged in an array. The driving control unit 50 includes an LED control integrated circuit (IC) to generate the driving signal S2 according to the signal S1, to control the light source 20 to turn on or off, or to change an illumination intensity.
The infrared sensing unit 40 of the first embodiment includes a pyroelectric infrared sensor. The pyroelectric infrared sensor is capable of generating an electric charge according to a radiation temperature received (also called a pyroelectric effect). When a person approaches, the pyroelectric infrared sensor senses a temperature difference between thermal radiation 100 of the person and any other static radiated temperature, and generates the signal S1. The infrared sensing unit 40 can also include a circuit consisting of other electrical components, such as timing chips and electric relays. In an alternative embodiment, the infrared sensing unit 40 may use other infrared sensors, such as thermopile infrared sensors or infrared photoelectric sensors.
In the illustrated embodiment, the energy-saving illumination device 1 further includes a circuit protecting unit 60 received in the human body sensing module 30. The circuit protecting unit 60 is configured to break an electrical connection between the driving control unit 50 and the circuit board 12 when current or voltage is abnormal, or when a temperature of the light source 20 is higher than a permitted maximum, to prevent damage to the light source 20. The circuit protecting unit 60 is a fuse in the illustrated embodiment, and prevents an abnormal current flowing to the light source 20.
In the illustrated embodiment, the energy-saving illumination device 1 further includes a state indicating unit 70 positioned on the human body sensing module 30, and electrically connected to the infrared sensing unit 40 and the driving control module 50, to indicate a normal state or an abnormal state of the energy-saving illumination device 1. In the illustrated embodiment, the state indicating unit 70 includes an LED indicating light source. The LED indicating light source is capable of emitting lights of different colors to indicate the normal state and the abnormal state of the infrared sensing unit 40, the driving control unit 50, and other electrical components of the energy-saving illumination device 1. When the state indicating unit 70 indicates the abnormal state, the energy-saving illumination device 1 may be replaced or otherwise receive attention.
In an alternative embodiment, the human body sensing module 30 of the energy-saving illumination device 1 can be plate-like or sheet-like, such as a card inserting type so that users can conveniently insert the voice control module 30 into the inserting groove 11 of the lamp holder 10, giving the energy-saving illumination device 1 human body sensing function. In addition, if the light source 20 is a durable LED light source, because the voice control module 30 is detachable and inserted into the receiving groove 11, the human body sensing module 30 can be detached from the lamp holder and replaced with a new module, thereby avoiding waste.
The energy-saving illumination device 1 and the energy-saving illumination device 2 can prevent damage when the circuit is overloaded, such as an abnormal supply voltage, a short circuit of electrical components of the circuit, or short circuit when one or more light-emitting diodes of the light source 20 malfunction. In addition, the energy-saving illumination devices 1, 2 can prevent damage to the light source 20 from a high temperature, and thus prevent low-efficiency operation because of a high heat sensitivity of the light-emitting diodes of the light source 20. The energy-saving illumination devices 1, 2 are durable and have a long lifespan.
The human body sensing module 30 is capable of sensing thermal radiation 100, automatically turn on or off, adjust an illumination intensity of the illumination devices 1, 2, and are detachable, thus decreasing repair costs and avoiding waste and pollution of the environment.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the embodiments or sacrificing all of its material advantages.
| Number | Date | Country | Kind |
|---|---|---|---|
| 101215437 | Aug 2012 | TW | national |
