Patent Grant
8754586
The present invention relates to a light emitting diode (LED) and particularly to an LED illumination system.
LED provides characteristics such as saving electric power, higher lighting efficiency and longer lifespan, thus has become a new generation of illumination element. It employs Epitaxy as a photoelectric element to generate light via electro luminescence transformation. Because the LED has many advantages, such as environment friendly, lower power consumption, higher efficiency and longer lifespan, it gradually replaces the traditional illumination equipments.
At present the LED has been widely adopted on various types of illumination apparatus. However, for indoor illumination the luminosity of a single LED still cannot match the conventional fluorescent lamp or halogen lamp. In order to provide sufficient indoor illumination, multiple LEDs have to be clustered together. At present, the LED light bulbs on the market mostly have one power converter to mate an LED. Such a structure is more expensive and consumes more electric power, and also has a shorter lifespan.
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However, the DC power supply 3 and the LEDs 2 are positioned close to each other, and heat generated by the DC power supply 3 would cause high temperature to affect lighting efficiency of the LEDs 2. Moreover, the DC power supply 3 is located in the LED illumination lamp set 1, and air circulation is undesirable that results in heat dissipation of the DC power supply 3 difficult. Hence the lifespan of the DC power supply 3 suffers, and in the event that the DC power supply 3 is damaged, replacement is also difficult.
In addition, in the event that the DC power supply 3 is burnt out and on fire, as it is installed on a ceiling, instant alarm is not always possible, and the fire could also be spread to further result in even more serious danger. Furthermore, the DC power supply 3 usually is connected to the AC power source, users who try to replace the LEDs 2 could inadvertently suffer electric shock.
The primary object of the present invention is to provide an LED illumination system with a single DC power supply to provide electric power required by a plurality of LED illumination lamp sets to save cost and avert high temperature from affecting the lighting efficiency of the LED illumination lamp sets, and also avoid the hazard of electric shock during repair and maintenance of the LED illumination lamp sets.
To achieve the foregoing object, the LED illumination system according to the invention includes at least two LED illumination lamp sets, a DC power supply and at least two power circuits corresponding to the LED illumination lamp sets. The DC power supply provides sufficient electric power for the LED illumination lamp sets, and is connected to the LED illumination lamp sets via the power circuits to reduce the number of the power supply needed and save cost. The LED illumination lamp sets also are separated from the DC power supply so that the high temperature generated by the DC power supply does not affect the lighting efficiency of the LED illumination lamp sets, and the hazard of electric shock during repair and maintenance of the LED illumination lamp sets can also be avoided.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
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Each LED illumination lamp set 10 includes a reflective lamp shell 11 and a plurality of LEDs 12 which can generate light after receiving voltage. The light generated by the LEDs 12 is then reflected by the reflective lamp shell 11 for illumination.
The DC power supply 20 provides sufficient electric power for the LED illumination lamp sets 10. However, the power supplied by the DC power supply 20 also can be adjusted according to the actual number of the LED illumination lamp sets 10.
The DC power supply 20 is connected to the LED illumination lamp sets 10 via the power circuits 30. The LED illumination lamp sets 10 can be arranged according to requirements to meet illumination need, and are supplied at a required voltage by the power circuits 30.
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The PWM 23 mainly includes a Bipolar Junction Transistor (BJT) 231, a base driver 232 and an operational amplifier (OP) 233. The operational amplifier 233 sends a feedback incorporating with the base driver 232 and BJT 231 to generate pulse width modulation. The transformer 21 and the AC power source 40 may also be bridged by a fuse 26.
By means of the structure set forth above, only a single DC power supply 20 can supply electric power required by the LED illumination lamp sets 10, hence the number of the DC power supply 20 can be reduced. Compared with the conventional techniques, the invention provides many advantages, notably:
1. Save material cost and total cost is reduced.
2. The LED illumination lamp sets 10 and DC power supply 20 are separated, thus the high temperature generated by the DC power supply 20 does not affect the lighting efficiency of the LED illumination lamp sets 10.
3. The hazard of electric shock to users caused by inadvertently touching the AC power source 40 during repair and maintenance of the LED illumination lamp sets 10 can be avoided.
4. Through the PWM 23, adjustable resistor 24 and capacitor 25, stability of the LED illumination system improves, and output voltage thereof can be adjusted as desired to alter the luminosity of the LED illumination lamp sets 10 to satisfy user's preference.
| Number | Name | Date | Kind |
|---|---|---|---|
| 20110193467 | Grajcar | Aug 2011 | A1 |
| 20110291585 | Foo | Dec 2011 | A1 |
| Number | Date | Country | |
|---|---|---|---|
| 20130063044 A1 | Mar 2013 | US |
