Light-emitting diode driving circuit

A light-emitting diode (LED) driving circuit, for driving an LED, comprising:

• an AC/DC converting circuit, for converting an AC power source into a DC power source;
• a switching element, having an input contact, an output contact, and a control contact, wherein the input contact is connected to the AC/DC converting circuit;
• a control unit, having a power contact, a control contact, a detecting contact, and a ground contact, wherein a first resistor is disposed between the power contact of the control unit and the input contact of the switching element, and the control unit outputs a control signal to the control contact of the switching element from the control contact, so as to turn on or turn off the switching element;
• a second resistor, having a first end and a second end, and disposed between the detecting contact and the ground contact of the control unit, for enabling the control unit to detect a voltage of the DC power source, so as to determine whether to output the control signal;
• a first capacitor, having a first end and a second end, wherein the first end of the first capacitor is connected to the power contact, and the second end of the first capacitor is connected to the ground contact and the second end of the second resistor;
• a first inductor, having a first end and a second end, wherein the first end of the first inductor is connected to the first end of the second resistor, and the second end of the first inductor is connected to the LED;
• a third resistor, having a first end and a second end, wherein the first end of the third resistor is connected to the first end of the first capacitor;
• and
• a first Schottky diode, having a cathode and an anode, wherein the cathode of the first Schottky diode is connected to the second end of the third resistor, and the anode of the first Schottky diode is connected to the second end of the first inductor.

A light-emitting diode (LED) driving circuit, for driving an LED, comprising:

• an AC/DC converting circuit, for converting an AC power source into a DC power source;
• a switching element, having an input contact, an output contact, and a control contact, wherein the input contact is connected to the AC/DC converting circuit;
• a control unit, having a power contact, a control contact, a detecting contact, and a ground contact, wherein a first resistor is disposed between the power contact of the control unit and the input contact of the switching element, and the control unit outputs a control signal to the control contact of the switching element from the control contact, so as to turn on or turn off the switching element;
• a second resistor, having a first end and a second end, and disposed between the detecting contact and the ground contact of the control unit, for enabling the control unit to detect a voltage of the DC power source, so as to determine whether to output the control signal;
• a first capacitor, having a first end and a second end, wherein the first end of the first capacitor is connected to the power contact, and the second end of the first capacitor is connected to the ground contact and the first end of the second resistor;
• a first inductor, having a first end and a second end, wherein the first end of the first inductor is connected to the first end of the second resistor, and the second end of the first inductor is connected to the LED;
• a third resistor, having a first end and a second end, wherein the first end of the third resistor is connected to the first end of the first capacitor;
• and
• a first Schottky diode, having a cathode and an anode, wherein the cathode of the first Schottky diode is connected to the second end of the third resistor, and the anode of the first Schottky diode is connected to the second end of the first inductor.