Patent Publication Number: US-8994282-B1

Title: Light emitting diode control circuit with synchronization signal and package structure for the same and system for the same

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a light emitting diode control circuit and package structure for the same and system for the same, and especially relates to a light emitting diode control circuit with synchronization signal and package structure for the same and system for the same. 
     2. Description of the Related Art 
     Nowadays, the connection types of the light emitting diode lamp string modules are separated into two types: the serial-type connection and the parallel-type connection. The light emitting diode lamp string modules are widely used for external walls of the building, decoration of trees, signboards, and scenery designing. 
     The related art light emitting diode lamp string modules are commonly employed to be connected in series. Also, the amount of the light emitting diode lamp string modules is determined according to the volume of the decorated objects. In addition, all of the light emitting diode lamp string modules are controlled by the same controller which initially controls the first light emitting diode lamp string module. 
     Although the light emitting diode lamp string modules are easily connected together, the remaining light emitting diode lamp string modules behind the abnormal light emitting diode lamp string module cannot be lighted even only one of the light emitting diode lamp string modules is abnormal. That is because the control signal cannot be sent to drive all of the remaining light emitting diode lamp string modules. 
     The parallel-type light emitting diode lamp string modules are connected to the controller in parallel. Accordingly, each one of the light emitting diode lamp string modules is controlled by the controller through a control line and an address line, respectively. For example, ten control lines and ten address lines need to be used when ten light emitting diode lamp string modules are employed to be connected in parallel. 
     The remaining light emitting diode lamp string modules can still be normally controlled when one of the light emitting diode lamp string modules is abnormal. However, the amount of the control lines and the address lines increase proportionally. Therefore, complexity and the costs of the equipment also increase when the amount of the light emitting diode lamp string modules increases. 
     No matter the connection type of the light emitting diode lamp string modules is the serial-type or the parallel-type, many power transmission lines and signal transmission lines need to be used to control the colors and intensities of the light emitting diode lamp string modules. Accordingly, cost down can be achieved only if the amount of the power transmission lines or the signal transmission lines can be reduced. 
     SUMMARY OF THE INVENTION 
     In order to solve the above-mentioned problems, an object of the present invention is to provide a light emitting diode control circuit with synchronization signal. 
     In order to solve the above-mentioned problems, another object of the present invention is to provide a light emitting diode package structure with synchronization signal. 
     In order to solve the above-mentioned problems, still another object of the present invention is to provide a light emitting diode system with synchronization signal. 
     In order to achieve the object of the present invention mentioned above, the light emitting diode control circuit is applied to a power positive terminal, a power negative terminal and at least a light emitting diode. The light emitting diode control circuit includes a signal coupling unit, an operational amplifier, a synchronization and control logic unit, a light signal generating unit, an output logic unit and at least a current output unit. The signal coupling unit is electrically connected to the power positive terminal. The operational amplifier is electrically connected to the signal coupling unit and the power negative terminal. The synchronization and control logic unit is electrically connected to the operational amplifier and the power negative terminal. The light signal generating unit is electrically connected to the synchronization and control logic unit and the power negative terminal. The output logic unit is electrically connected to the light signal generating unit and the power negative terminal. The current output unit is electrically connected to the output logic unit and the light emitting diode. The synchronization and control logic unit sends a synchronization clock signal to the light signal generating unit. The light signal generating unit sends a light control signal to the output logic unit. According to the light control signal, the output logic unit is configured to control the current output unit to drive the light emitting diode. 
     In order to achieve other object of the present invention mentioned above, the light emitting diode package structure includes the light emitting diode control circuit mentioned above. The light emitting diode package structure further includes a first support, a first platform, a second support, a second platform, the light emitting diode and a package. The first platform is arranged at one side of the first support. The second support is arranged parallel to the first support. The second platform is arranged at one side of the second support. The light emitting diode control circuit is arranged on the second platform and is electrically connected to the second platform. The light emitting diode is arranged on the first platform and is electrically connected to the first platform. The light emitting diode control circuit is electrically connected to the light emitting diode. The package covers the first platform, the second platform, the light emitting diode control circuit and the light emitting diode. 
     In order to achieve other object of the present invention mentioned above, the light emitting diode system is applied to an alternating current power apparatus and an alternating current to direct current apparatus. The alternating current power apparatus sends an alternating current power to the alternating current to direct current apparatus. The alternating current to direct current apparatus rectifies the alternating current power into a rectified power. The alternating current to direct current apparatus sends the rectified power to the light emitting diode system. The light emitting diode system includes a plurality of the light emitting diode package structures mentioned above. The light emitting diode system further includes a carrier-synchronization signal generating unit and a transmission line. The carrier-synchronization signal generating unit is electrically connected to the alternating current to direct current apparatus and the light emitting diode package structure. The transmission line is electrically connected to the light emitting diode package structures. The carrier-synchronization signal generating unit detects a frequency of the rectified power to provide the synchronization and control logic unit to generate the synchronization clock signal. Therefore, the light emitting diodes in accordance with the light emitting diode control circuits are driven at the same time. 
     The efficiency of the present invention is to reduce the transmission lines of the light emitting diode lamp. Therefore, the cost of the light emitting diode lamp is reducing. 
    
    
     
       BRIEF DESCRIPTION OF DRAWING 
         FIG. 1  shows a block diagram of the first embodiment of the light emitting diode control circuit of the present invention. 
         FIG. 2  shows a perspective view of the light emitting diode package structure of the present invention. 
         FIG. 3  shows a block diagram of the first embodiment of the light emitting diode system of the present invention. 
         FIG. 4  shows a block diagram of the second embodiment of the light emitting diode system of the present invention. 
         FIG. 5  shows a block diagram of the third embodiment of the light emitting diode system of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  shows a block diagram of the first embodiment of the light emitting diode control circuit of the present invention. A light emitting diode control circuit  10  with synchronization signal is applied to a power positive terminal  20 , a power negative terminal  30  and at least a light emitting diode  40 . 
     The light emitting diode control circuit  10  includes a signal coupling unit  102 , an operational amplifier  104 , a synchronization and control logic unit  106 , a light signal generating unit  108 , an output logic unit  110 , at least a current output unit  112 , a voltage regulator  114  and an oscillator  116 . 
     The signal coupling unit  102  is electrically connected to the power positive terminal  20 . The operational amplifier  104  is electrically connected to the signal coupling unit  102  and the power negative terminal  30 . The synchronization and control logic unit  106  is electrically connected to the operational amplifier  104  and the power negative terminal  30 . The light signal generating unit  108  is electrically connected to the synchronization and control logic unit  106  and the power negative terminal  30 . The output logic unit  110  is electrically connected to the light signal generating unit  108  and the power negative terminal  30 . The current output unit  112  is electrically connected to the output logic unit  110  and the light emitting diode  40 . The voltage regulator  114  is electrically connected to the power positive terminal  20 , the power negative terminal  30 , the signal coupling unit  102 , the operational amplifier  104 , the synchronization and control logic unit  106 , the light signal generating unit  108  and the output logic unit  110 . The oscillator  116  is electrically connected to the voltage regulator  114  and the power negative terminal  30 . 
     The synchronization and control logic unit  106  sends a synchronization clock signal  118  to the light signal generating unit  108 . The light signal generating unit  108  sends a light control signal  120  to the output logic unit  110 . According to the light control signal  120 , the output logic unit  110  is configured to control the current output unit  112  to drive the light emitting diode  40 . 
       FIG. 2  shows a perspective view of the light emitting diode package structure of the present invention. A light emitting diode package structure  50  with synchronization signal includes the light emitting diode control circuit  10  mentioned above. 
     The light emitting diode package structure  50  further includes a first support  502 , a first platform  504 , a second support  506 , a second platform  508 , the light emitting diode  40  and a package  510 . 
     The first platform  504  is arranged at one side of the first support  502 . The second support  506  is arranged parallel to the first support  502 . The second platform  508  is arranged at one side of the second support  506 . The light emitting diode control circuit  10  is arranged on the second platform  508  and is electrically connected to the second platform  508 . The light emitting diode  40  is arranged on the first platform  504  and is electrically connected to the first platform  504 . The light emitting diode control circuit  10  is electrically connected to the light emitting diode  40 . The package  510  covers the first platform  504 , the second platform  508 , the light emitting diode control circuit  10  and the light emitting diode  40 . 
       FIG. 3  shows a block diagram of the first embodiment of the light emitting diode system of the present invention. A light emitting diode system  60  with synchronization signal is applied to an alternating current power apparatus  70  and an alternating current to direct current apparatus  80 . The alternating current power apparatus  70  sends an alternating current power  72  to the alternating current to direct current apparatus  80 . The alternating current to direct current apparatus  80  rectifies the alternating current power  72  into a rectified power  82 . The alternating current to direct current apparatus  80  sends the rectified power  82  to the light emitting diode system  60 . 
     The light emitting diode system  60  includes a plurality of the light emitting diode package structures  50  mentioned above. The light emitting diode system  60  further includes a carrier-synchronization signal generating unit  602  and a transmission line  604 . The carrier-synchronization signal generating unit  602  is electrically connected to the alternating current to direct current apparatus  80  and the light emitting diode package structure  50 . The transmission line  604  is electrically connected to the light emitting diode package structures  50 . 
     The carrier-synchronization signal generating unit  602  detects a frequency (50˜60 Hz) of the rectified power  82  to provide the synchronization and control logic unit  106  to generate the synchronization clock signal  118 . Therefore, the light emitting diodes  40  in accordance with the light emitting diode control circuits  10  are driven at the same time. 
       FIG. 4  shows a block diagram of the second embodiment of the light emitting diode system of the present invention. The description for the elements shown in  FIG. 4 , which are similar to those shown in  FIG. 3 , is not repeated here for brevity. Moreover, the transmission line  604  in  FIG. 3  is electrically connected to the light emitting diode package structures  50  in series. The transmission line  604  in  FIG. 4  is electrically connected to the light emitting diode package structures  50  in parallel. 
       FIG. 5  shows a block diagram of the third embodiment of the light emitting diode system of the present invention. The description for the elements shown in  FIG. 5 , which are similar to those shown in  FIG. 3˜4 , is not repeated here for brevity. Moreover, the carrier-synchronization signal generating unit  602  includes a first capacitor  622 . The first capacitor  622  is electrically connected to the alternating current to direct current apparatus  80  and the light emitting diode package structure  50 . 
     The efficiency of the present invention is to reduce the transmission lines of the light emitting diode lamp. Therefore, the cost of the light emitting diode lamp is reducing. 
     Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have been suggested in the foregoing description, and others will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.