The principle of the touch-control table lamp is to install an electronic touch IC inside, and form a control loop with the electrode sheet at the touch point of the desk lamp.
When the human body touches the sensing electrode sheet, the touch signal is transmitted to the touch sensing end by the pulsating direct current, and then the touch sensing end will send a trigger pulse signal to control the light on; touch it again, the touch signal will generate a pulse signal to the touch sensing end by the pulsating direct current, and then the touch sensing end will stop sending the trigger pulse signal. When the alternating current passes zero, the light will naturally go out.
However, sometimes after a power outage or unstable voltage, it will light up automatically. If you touch paper or cloth with excellent signal sensitivity, it can also be controlled.
The working principle of the adjustable desk lamp is that the resistor R2, potentiometer RP1, and capacitor C form a resistor-capacitor phase shift circuit. By adjusting RP1, the conduction angle of the bidirectional thyristor V can be changed, thereby changing the brightness of the bulb EL. Resistor R1 is a current limiting resistor. The charging speed of C is also related to the parallel circuit.
When R1 and RP2 are fixed, the size of the shunt is determined by the resistance of the photoresistor RL. When the grid voltage rises, the light brightness increases, the RL resistance decreases, the shunt increases, the voltage across the capacitor C rises slower, the thyristor V conduction angle decreases, the output voltage decreases, and the light brightness decreases; conversely, when the grid voltage decreases, the RL resistance increases, the shunt decreases, the thyristor conduction angle increases, the output voltage increases, and the light brightness increases. The light brightness automatically stabilizes at the set value.
The analog variable brightness table lamp and analog variable control center have the functions of remote control on and off, multiple brightness adjustable at will, and automatic brightness memory storage.
The above functions are realized by using a button on the remote control. Press and release the button to turn on or off. Press and hold the button to dim the light. It will cycle from off to the brightest and from the brightest to off. When you need a certain light, just release your hand. When you turn off the light, the brightness state at that time will be automatically saved. The automatically memorized brightness state will appear when you turn on the light next time. This saves power while protecting your eyes.
