LED light string controller, LED light string and artificial Christmas tree

A light string controller, comprising:

• a housing, wherein, an accommodation space sealed is provided inside the housing, an opening is provided on two opposite sides of the housing;
• a control circuit board provided inside the accommodation space, wherein, a power supply terminal and an output terminal are provided on the control circuit board;
• two wires, wherein, the two wires pass through two openings of the housing and are connected to the power supply terminal and the output terminal of the control circuit board;
• wherein, the power supply terminal is configured to be connected to a DC power supply though one wire of the two wires, the output terminal is configured to be connected to a light string through the other wire of the two wires, a power supply from the power supply terminal to the output terminal is controlled according to an output of high and low levels of the control circuit board;
• wherein a circuit is provided on the control circuit board, the circuit includes:
• a master control chip configured to output high and low levels;
• a voltage conversion module connected to a power supply terminal of the master control chip, wherein the voltage conversion module is configured to be connected to the DC power supply and supply power to the master control chip,
• a control signal receiving module connected to an input terminal of the master control chip, wherein the control signal receiving module is configured to obtain and transmit a trigger signal to the master control chip,
• an LED driving module connected to an output terminal of the master control chip, wherein the LED driving module is configured to control a power supply to the light string according to an output of the high and low levels of the master control chip;
• the light string controller further comprising a key sheet and a keycap, the key sheet is located at the accommodation space and electrically connected to the control circuit board, the keycap is provided near a button of the key sheet and passes through the housing;
• the key sheet is electrically connected to the control circuit board;
• the key sheet obtains a key signal generated when the button of the key sheet is pressed, and transmits the key signal to the control circuit board;
• the control signal receiving module includes a key control unit connected to the button of the key sheet, wherein the key control unit is configured to obtain and transmit the key signal to the master control chip.