How is the countdown function of the fan realized?

Fans are an indispensable appliance for cooling in hot weather. In recent years, fans have been equipped with a countdown function that allows users to set a timer for the device to turn off automatically after a certain period. This function helps save energy and prevent the fan from running unnecessarily, making it more convenient for users. So, how is the countdown function of a fan implemented? Generally, there are two types of countdown functions: mechanical and electronic.

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Mechanical countdown function works by using a spring-loaded timer that is set by the user. When the timer runs out, the spring is released and the fan turns off. This mechanism is simple and reliable, but it requires manual setting and cannot be adjusted after the timer is set.

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Input Power: 45W
input voltage: 220-240V
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Electronic countdown function is more common in modern fans. It uses a microcontroller to control the countdown and turn off the fan automatically. The microcontroller is programmed with a timer function that can be set by the user through a control panel or remote control. The timer function sends a signal to the motor to turn off the fan when the time is up.

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The electronic countdown function has several advantages over the mechanical one. It allows for more precise timing, and users can set the countdown time to any duration they want. In addition, electronic timers can be programmed to repeat the countdown at regular intervals, which is useful for fans used in commercial or public spaces.

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To implement the electronic countdown function, a fan must be equipped with a microcontroller and a timer circuit. The timer circuit is typically a simple RC circuit that generates a pulse signal to trigger the microcontroller when the countdown is complete.

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