Abstract:
The invention provides a modularized LED illuminator, wherein each module includes a power block and an illuminating block. The power block treats the extra power with rectification and transformation so that a working voltage is generated to the illuminating block for illuminating. Multiple modularized LED illuminators are connected in series or parallel to obtain larger brightness and modular connection.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to an illuminator using LED (Light Emitting Diode) as light source, and more particularly to illuminator composed of modular connected LED. 
     2. Description of Related Art 
     The LED has advantages of smaller volume, and higher efficiency. The technical progress leads to the continuous improvement of the photo-electric transfer efficiency of LED. Research and development are continuously invested into the LED. Thus the LED now has the high potential to be illuminating light source. 
     LED has been widely employed as illuminating devices with the improvement of brightness of LED. Besides indicators and traffic signal lamps, LED is gradually used in the traditional lamp. But there are some drawbacks. First, most of the conventional LED illuminators are designed into an illuminator with fixed brightness so that the conventional LED illuminators do not satisfy the need for larger brightness. Furthermore, all the components of the conventional LED illuminators are consumables. When the LED illuminator does not work, it has to be replaced with a new one without any possible of repairing. 
     It is concluded that modularized LED illuminators are more convenient for the users. Therefore, it is necessary to develop modularized LED illuminators. 
     OBJECTS AND SUMMARY OF THE INVENTION 
     It is therefore a main object of the invention to provide a LED illuminator that is designed into modular connector for replacing the damaged LED module individually without changing a new set, and facilitating to compose a bigger size of illuminator with desired number of LED modules to obtain desired brightness. 
     The modularized LED illuminator is comprised of a power block and an illuminating block, wherein said power block is used for rectifying the power source and transforming the voltage of the rectified power source such that a working voltage is generated to the illuminating block for illuminating. 
     Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will become more fully understood from the detailed description given hereinbelow illustration only, and thus are not limitative of the present invention, and wherein: 
     FIG. 1 is a system block-diagram showing the first embodiment of the invention. 
     FIG. 2 is a system block-diagram showing the second embodiment of the invention. 
     FIG. 3 is a system block-diagram showing the third embodiment of the invention. 
     FIG. 4 is a diagram showing the LED modules of the invention connected in series. 
     FIG. 5 is a diagram showing the LED modules of the invention connected in parallel. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The modularized LED illuminator provided by the invention includes a set of modules with modularized-connection function. Several embodiments are disclosed under the principle of the invention. 
     Refer to FIG. 1 showing the system block-diagram of the first embodiment of the invention. The first embodiment of the invention is suitable for the different AC power voltage in different countries worldwide. The power block  10  is composed of a rectification unit  11 , a voltage dropping unit  12 , a voltage transforming unit  13  and a voltage regulating unit  14 . The rectification unit  11  is connected to the AC power for commutating the AC power into DC (Direct Current), and send to the voltage dropping unit  12 . A full-wave or half-wave rectifier can be selected as the rectification unit  11 . The voltage dropping unit  12  is connected to the output of the rectification unit  11  for dropping the DC power into a desired voltage. The voltage dropping unit  12  is composed of low power off-line switchers so as to suit the different power voltage in different countries. After the DC power is dropped by the voltage dropping unit  12 , it is transformed into a working voltage by the transformation unit  13 . Finally passing through the voltage regulation unit  14 , the working voltage is sent to the illuminating block  20 . The illuminating block  20  is composed of at least one LED. The illuminating block  20  illuminates after receiving the regulated working voltage. 
     The second embodiment of the invention shown in FIG. 2 will be further explained as follows. 
     The power block  10  of the second embodiment of the invention is comprised of a voltage transforming unit  13  and a rectification unit  11 . The voltage transforming unit  13  coupled to the AC power source is composed of a plurality of capacitors to achieving the voltage transforming function. The AC power source is transformed into an AC working voltage and then delivered to the rectification unit  11 . The rectification  11  is a full-wave or a half-wave rectifier for commutating the AC working voltage into a DC working voltage, and then delivered to the illuminating block  20 . The illuminating block  20  is composed of at least one LED. The illuminating block  20  illuminated after receiving the DC working voltage. 
     In follows the third embodiment of the invention will be described in details, cooperating to the system block-diagram shown in FIG.  3 . 
     The power block  10  of the third embodiment of the invention is comprised of a voltage transforming unit  13  and a rectification unit  11 . The voltage transforming unit  13  is connected to the AC power source. The voltage transforming unit  13  is comprised of a transformer for transforming the AC power source into an AC working voltage which is then sent to the rectification unit  11 . The rectification  11  is a full-wave or a half-wave rectifier for commutating the AC working voltage into a DC working voltage which is then conducted to the illuminating block  20 . The illuminating block  20  is composed of at least one LED. The illuminating block  20  illuminated after receiving the DC working voltage. 
     Finally, the connection structure of the LED modules is minutely described cooperating to the connecting diagram shown in FIG.  4 . The first LED module  40  and the second LED module  50  include respectively an AC circuit  30 , two input terminals and two output terminals. The four terminals are symmetrically set upon the ends of two AC circuits  30  to form a module block for connection. 
     The first module  40  adopts the first input terminal  401  and the second output terminal  403  for receiving the AC power source and then delivering to the power block  10  and the illuminating block  20 . Furthermore, the AC power is transmitted to the first output terminal  402  and the second output terminal  404  through the AC circuit  30  and to the third input terminal  501  and the fourth input terminal  503  of the second module  50  to construct a series connection for supplying the AC power to the second module  50 . Meanwhile, the AC power source is also delivered to the third output terminal  502  and the fourth output terminal  504  for connecting more modules. 
     Besides the series connection, the invention also provides a parallel connection for achieving the modularized connection. Refer to FIG. 5 showing a connecting diagram. 
     The inner blocks of the first module  40  and the second module  50  are the same as above-mentioned in FIG.  4 . The difference in this embodiment is the AC circuit  30 . A PCB (Printed-Circuit-Board) is used to implemented the AC circuit  30  for smoothing the AC circuit loop. In case that the first input terminal  401  and the second input terminal  403  (and the third input terminal  501  and the fourth input terminal  503 ) are designed on the topside of the PCB, the first output terminal  402  and the second output terminal  404  (and the third output terminal  502  and the fourth output terminal  504 ) are laid on the bottom side. 
     In the both above-mentioned connection methods, the coordinating terminals can be welded up with metal respectively, or joint in mechanical way (like in joggle joint and so on) for keeping the circuit closed and intensive joint. 
     In practice, multiple modularized LED modules can be assembled according to the desired brightness. The selectivity and convenience is better than that of the conventional LED illuminator. Because employing a Low Power Off-line switchers and a transformer in the voltage dropping unit, the voltage response is better than that of the conventional LED illuminator. 
     The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.