Abstract:
A light emitted diode circuit includes: a plurality of driving circuits, wherein the plurality of driving circuit are connected in series, and each driving circuit includes a plurality of diodes; and a plurality of loading circuits connected with the driving circuits, respectively; wherein the plurality of driving circuits are arranged for generating a plurality of driving voltages to drive the plurality of loading circuits, respectively.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefits of U.S. provisional application No. 62/090,889 (filed on 2014, Dec., 12). The entire contents of the related applications are incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a diode circuit, and more particularly, to a light emitted diode (LED) circuit that can reduce power consumption effectively and generate less heat. 
     2. Description of the Prior Art 
     Generally, a LED circuit has higher temperature in operation which causes a bad effect to whole circuit, therefore, how to utilize a simple circuit architecture to reduce the generated heat when the LED circuit is operating is an important issue. 
     SUMMARY OF THE INVENTION 
     One of the objectives of the present invention is to provide an LED circuit whose power consumption and the generated heat can be reduced effectively. 
     According to an embodiment of the present invention, a LED circuit comprises: a plurality of driving circuits, wherein the plurality of driving circuits are connected in series, and each driving circuit comprises a plurality of diodes; a plurality of loading circuits, wherein each loading circuit connects to the corresponding driving circuit respectively; wherein the plurality of driving circuits are arranged for generating a plurality of driving voltages for driving the plurality of loading circuit respectively. 
     These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram illustrating an LED circuit according to an embodiment of the present invention. 
         FIG. 2  is a diagram illustrating a loading block according to an embodiment of the present invention. 
         FIG. 3  is a diagram illustrating an LED circuit according to another embodiment of the present invention. 
         FIG. 4  is a diagram illustrating an LED circuit according to yet another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms “include” and “comprise” are used in an open-ended fashion, and thus should not be interpreted as a close-ended term such as “consist of”. Also, the term “couple” is intended to mean either an indirect or direct electrical connection. Accordingly, if one device is coupled to another device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections. 
       FIG. 1  is a diagram illustrating an LED circuit  100  according to an embodiment of the present invention. As shown in  FIG. 1 , the LED circuit  100  comprises a plurality of driving circuits  101  to  10 M connected in series and a plurality of loading circuits, wherein each driving circuit connects to the corresponding loading circuit  120 , and each driving circuit comprises diodes D 1 , D 2 , D 3  and D 4  and nodes N 1 , N 2 , N 3  and N 4 . As shown in  FIG. 1 , the diodes D 1 , D 2 , D 3  and D 4  constitute a pattern like a bridge circuit. More specifically, take driving circuit  101  as an example, an N terminal of the diode D 1  and a P terminal of the diode D 2  connect to a node N 1  included within the driving circuit  101 , an N terminal of the diode D 2  and an N terminal of the diode D 3  connect to a node N 2  included within the driving circuit  101 , a P terminal of the diode D 3  and an N terminal of the diode D 4  connect to a node N 3  included within the driving circuit  101 , and a P terminal of the diode D 4  and a P terminal of the diode D 1  connect to a node N 4  included within the driving circuit  101 . In addition, the node N 1  of the driving circuit  101  connects to a terminal of an alternating current (AC) source, and a node N 3  of the driving circuit  10 M connects to the other terminal of the AC source, besides, the node N 1  of each driving circuit (except the driving circuit  101 ) is connected to the node N 3  of the previous driving circuit as shown in  FIG. 1 . And each loading circuit comprises at least a loading block connected in parallel. In this embodiment, more than one loading block employed here as shown in  FIG. 1 , wherein the at least a loading block connected in parallel comprises a plurality of LEDs, and the plurality of LEDs can be equally divided into a plurality of LED strings connected in parallel, and the LEDs included within each LED string are connected in series. Refer to  FIG. 1  and  FIG. 2 ,  FIG. 2  is a diagram illustrating a loading block  200  according to an embodiment of the present invention. In  FIG. 2 , a plurality of LEDs in the loading block  200  are equally divided into two LED strings (i.e. the LED strings  210  and  220 ), but it&#39;s only for illustration, not a limitation of the present invention, in other embodiments, the plurality of LEDs can be divided into three or more LED strings. As shown in  FIG. 2 , P terminals of the first LEDs of the LED strings  210  and  220  couple to a node N 21 , and N terminals of the last LEDs of the LED strings  210  and  220  couple to a node N 22 , and the nodes N 21  and N 22  are coupled to the nodes N 2  and N 4  of the corresponding driving circuit respectively, and each loading block further comprises two resistances, i.e. the resistors R 1  and R 2  whose resistances are very low, and the resistor R 1  may be coupled between the first LEDs of the LED strings  210  and  220 , and the resistor R 2  may be coupled between the last LEDs of the LED strings  210  and  220 . 
       FIG. 3  is a diagram illustrating an LED circuit  300  according to another embodiment of the present invention. The LED circuit  300  comprises a plurality of driving circuits  301  to  30 M connected in series and a plurality of loading circuits, wherein each of the driving circuits  301  to  30 (M−1) is coupled to a corresponding loading circuit, e.g. the driving circuit  301  is coupled to the loading circuit  320 . The plurality of loading circuits in  FIG. 3  are identical with the plurality of loading circuits shown in the embodiments of  FIG. 1  and  FIG. 2 , the detailed description is thus omitted here. In this embodiment, the driving circuits  301  and  30 (M−1) comprises diodes D 1  and D 2  and nodes N 1 , N 2  and N 3 , wherein N terminals of the diodes D 1  and D 2  of the driving circuits  302  to  30 (M−1) are connected to the node N 2 , and a P terminal of the diode D 1  is connected to the node N 1 , a P terminal of the diode D 2  is connected to the node N 3 . In addition, the node N 1  of the driving circuit  301  is coupled to a terminal of an AC source via the node N 1 . And the driving circuit  30 M comprises a diode D y  and nodes N 1  and N 3 , wherein a P terminal of the diode D y  is connected to the node N 1 , an N terminal of the diode D y  is coupled to the other terminal of the AC source via the node N 3 . And, the nodes N 1  of the driving circuits  302  to  30 M are connected to the node N 3  of the previous driving circuit as shown in  FIG. 3 . Refer to  FIG. 2  and  FIG. 3 , the nodes N 2  and N 3  of the driving circuits  302  to  30 (M−1) are coupled to the nodes N 21  and N 22  of the at least a loading block of the corresponding loading circuit respectively. 
       FIG. 4  is a diagram illustrating an LED circuit  400  according to yet another embodiment of the present invention. The LED circuit  400  comprises a plurality of driving circuits  401  to  40 M connected in series and a plurality of loading circuits, wherein each of the driving circuits  401  to  40  (M−1) is coupled to a corresponding loading circuit, e.g. the driving circuit  401  is coupled to the loading circuit  420 . And the plurality of loading circuits are identical with the plurality of loading circuits shown in the embodiments of  FIG. 1  and  FIG. 2 , the detailed description is thus omitted here. In this embodiment, the driving circuits  401  and  40 (M−1) comprises diodes D 1  and D 2  and nodes N 1 , N 2  and N 3 , wherein P terminals of the diodes D 1  and D 2  of the driving circuits  401  to  40 (M−1) are connected to the node N 2 , and an N terminal of the diode D 1  is connected to the node N 1 , an N terminal of the diode D 2  is connected to the node N 3 . In addition, the node N 1  of the driving circuit  401  is coupled to an AC source via the node N 1 . And the driving circuit  40 M comprises a diode D y  and nodes N 1  and N 3 , wherein a P terminal of the diode D y  is coupled to the other terminal of the AC source via the node N 1 , and an N terminal of the diode D y  is connected to the node N 1 . And, the nodes N 1  of the driving circuits  402  to  40 M are connected to the node N 3  of the previous driving circuit. Refer to  FIG. 2  and  FIG. 4 , the nodes N 2  and N 3  of the driving circuits  402  to  40  (M−1) are coupled to the nodes N 22  and N 21  of the at least a loading block of the corresponding loading circuit respectively. 
     In the embodiments of  FIG. 1  to  FIG. 4 , the AC sources are the power source from electric outlet, but this is not a limitation of the present invention. Besides, the quantity of the driving circuit, loading block, the LED string, the LED included in a LED string is variable according to the used AC source as long as the impedance matching of all loadings can reach the max power efficiency. 
     With the assistance of optical lab of Taiwan SGS Co., Ltd, the experiment condition is: environment temperature 25 Celsius degrees, humidity 60±20%, input AC source 110V 60 Hz, loading 504 LEDs, (in the present invention, there are seven driving circuits and corresponding loading circuit, each loading circuit comprises six loading blocks, each loading block comprises two Led strings, each LED string comprises six LEDs). With this condition, the measured result of the present invention is power consumption 15.66 Watt, the power factor 0.8013, and the consumed energy is 0.01566 kwHr which shows the present invention can reduce the power consumption and the generated heat. 
     Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.