Led lighting device

Abstract

The purpose of the present invention is to reduce heat generated through a switching IC circuit in order to protect a switching IC circuit by connecting a resistor to an LED unit in which a plurality of LEDs are connected so as to disperse heat in the resistor when a rated voltage or more is inputted. To this end, the LED lighting device comprises: a rectification circuit unit for receiving input power from a power source unit and outputting a rectified power; an LED unit having a plurality of LED channels connected in series and a resistor unit connected to the last end of the LED channels; a current sensing resistor; and a switch circuit unit comprising a plurality of switches, wherein an nth switch is connected to the rear end of an nth LED channel so as to control an operation of the nth LED channel and is controlled by a sum of a current of the nth switch and a current of an (n+1)th switch, which flows through the current sensing resistor.

1 - 27 . (canceled) 
     
     
         28 . A light emitting diode (LED) lighting device, comprising:
 a rectifier circuit unit for receiving input power from a power source unit and outputting a rectified power;   an LED unit having a plurality of LED channels connected in series a resistor unit connected to the last end of the LED channels, wherein each LED channel includes a front end and a rear end;   a current sensing resistor; and   a switch circuit unit comprising a plurality of switches, ghost light prevention resistor is connected to the front end of the first LED channel, wherein an N th  switch is connected to the rear end of an N th  LED channel so as to control an operation of the N th  LED channel, and is controlled by a sum of a current of the N th  switch and a current of an (N+1) th  switch, wherein N is a positive integer, and which flows through the current sensing resistor.   
     
     
         29 . The LED lighting device of  claim 28 , wherein ghost light prevention resistor provides a current path through the ghost light prevention resistor and prevents the generation of ghost light. 
     
     
         30 . The LED lighting device of  claim 28 , wherein a resistor unit is connected to the last LED channel, the switch circuit unit includes a switch connected to the resistor unit, and then the resistor unit distributes and decreases heat generating at the switch circuit unit. 
     
     
         31 . The LED lighting device of  claim 28 , further comprising:
 a plurality of LED operation units,   wherein each of the LED operation units comprises the LED unit, the current sensing resistor, and the switch circuit unit,   wherein the plurality of the LED operation units are connected each other in series to provide more brightness at a specific input voltage or more, compared with using one LED operation unit.   
     
     
         32 . The LED lighting device of  claim 28 , further comprising:
 a plurality of LED operation units,   wherein each of the LED operation units comprises the rectifier circuit unit, the LED unit, the current sensing resistor, and the switch circuit unit,   wherein each of the plurality of the LED operation units is connected in parallel to the power source unit.   
     
     
         33 . The LED lighting device of  claim 28 , further comprising:
 a switch circuit current blocking unit connected in series to the resistor unit for sensing and blocking a current, which flows through the switch circuit unit.   
     
     
         34 . The LED lighting device of  claim 33 , wherein a stable operation current value with which the switch circuit unit is stably operated is set in the switch circuit current blocking unit,
 wherein, when the current flowing through the switch circuit current blocking unit is greater than the stable operation current value, the switch circuit current blocking unit blocks the switch through which the current flows among the switches in the switch circuit unit to block a current flowing through the switch circuit unit.   
     
     
         35 . A light emitting diode (LED) lighting device, comprising:
 a rectifier circuit for receiving an input power from a power source unit and outputting a rectified power;   an LED unit comprising a plurality of LED channels, the plurality of LED channels being connected in series and comprising a first LED channel, a second LED channel and a N th  LED channel, wherein N is a positive integer and each LED channel includes a front end and a rear end;   a variable resistor; and   a switch circuit unit comprising a plurality of switches, ghost light prevention resistor is connected to the front end of the first LED channel, wherein an N th  switch is connected to the rear end of an N th  LED channel so as to control an operation of the N th  LED channel, and is controlled by a sum of a current of the N th  switch and a current of an (N+1) th  switch, wherein N is a positive integer and which flows through the variable resistor and   wherein, forward voltages of the LED channels are unevenly redistributed so as to keep power consumption at each of the plurality of switches the same.   
     
     
         36 . The LED lighting device of  claim 35 , wherein the 1st LED channel is coupled to the rectification circuit and the N th  LED channel is coupled to the resistor unit which is a last element in the series configuration of the LED unit. 
     
     
         37 . The LED lighting device of  claim 35 , wherein the LED unit comprises capacitors, each connected in parallel to each of the LED channels. 
     
     
         38 . The LED lighting device of  claim 35 , wherein the variable resistor value of the variable resistor is decreased to increase the number of operating LED channels, causing the lighting device to become bright. 
     
     
         39 . The LED lighting device of  claim 35 , wherein the variable resistor value of the variable resistor is increased to decrease the number of operating LED channels, causing the lighting device to become weak 
     
     
         40 . The LED lighting device of  claim 35 , wherein the LED unit further comprises a resistor connected to a last end of the LED channels and configured to decrease heat generated at the switch circuit unit. 
     
     
         41 . The LED lighting device of  claim 35 , wherein the switches of the switch circuit unit are automatically controlled by a voltage value applied to the current sensing resistor in accordance with a rectified input to the LED unit, without use of any input voltage sensing circuit or any input period sensing circuit. 
     
     
         42 . A light emitting diode (LED) lighting device, comprising:
 a rectifier circuit unit for receiving input power from a power source unit and outputting a rectified power;   an LED unit having a plurality of LED channels connected in series, wherein each LED channel includes a front end and a rear end;   a dimming control unit comprising a variable resistor for controlling the current flowing through the LED unit to control dimming of the LED channel; and   a switch circuit unit comprising a plurality of switches, ghost light prevention resistor is connected to the front end of the first LED channel, wherein an N th  switch is connected to the rear end of an N th  LED channel so as to control an operation of the N th  LED channel, and is controlled by a sum of a current of the N th  switch and a current of an (N+1) th  switch, wherein N is a positive integer and which flows through the variable resistor.   
     
     
         43 . The LED lighting device of  claim 42 , wherein the variable resistor is connected to each of the switches comprised in the switch circuit unit. 
     
     
         44 . The LED lighting device of  claim 42 , wherein the LED unit further comprises a charge storage circuit unit, receiving power from the rectifier circuit unit, storing charges at a high voltage, and outputting the stored charges at low voltage; 
     
     
         45 . The LED lighting device of  claim 42 , further comprising:
 the variable resistor value is increased to make the plurality of switches to be operated lower and to decrease the plurality of LED channels to be operated and then the lighting device becomes weak.   
     
     
         46 . The LED lighting device of  claim 42 , further comprising:
 a dimming control is performed by controlling the resistance value of the variable resistor.   
     
     
         47 . The LED lighting device of  claim 46 , further comprising:
 a dimming control is performed by controlling the current value flowing through the nth switch, and then changing the current value flowing through the LED channel to be operated through the nth switch.