Light-emitting diode lamp string system

Alight-emitting diode lamp string system comprising:

• a light-emitting diode lamp string comprising a plurality of light-emitting diode lamps electrically connected to each other, wherein each of the light-emitting diode lamps comprises a first controller and a plurality of light-emitting diodes electrically connected to the first controller respectively;
• and
• a control apparatus receiving a direct-current power and comprising a controller, a power circuit, a controlled switch, and an impedance component, wherein the controlled switch is electrically connected to the controller and is arranged on the power circuit to form a first loop, and the impedance component is connected across the controlled switch and is arranged on the power circuit to form a second loop, and the control apparatus is electrically connected to the light-emitting diode lamp string through the power circuit,
• wherein when the controller performs a lighting mode, the controller switches the controlled switch to turn on or off the controlled switch, so that when the controlled switch is turned on, a first voltage is formed from the direct-current power through the first loop, and when the controlled switch is turned off, a second voltage is formed from the direct-current power through the second loop;
• wherein the first voltage and the second voltage have a voltage difference and form a lighting signal;
• the first controller of each of the light-emitting diode lamps identifies the lighting signal to drive each of the light-emitting diodes to operate based on the lighting signal;
• wherein each of the light-emitting diode lamps further comprises:
• an impedance-balancing unit electrically connected to the first controller and the light-emitting diode;
• wherein the impedance-balancing unit adjusts an impedance of the light-emitting diode lamp to a fixed impedance based on the direct-current power received by the light-emitting diode lamp, so that a voltage of each of the light-emitting diode lamps is similar.