The present invention relates to the electric fan speed regulator. More particularly, the present invention relates to a Fan speed Controller based on room temperature that controls the speed of the fan with respect to the room temperature. Automatic fan speed regulator is the device that automatically regulates the speed of the fan according to the surrounding temperature.

Background of the invention

Electric fan is one of the most popular electrical devices due to its cost effectiveness and low power consumption advantages. It is also one of the most sensible solutions to offer a comfortable and energy efficient. In fact, the fan has been long used and still available in the market. With the improvement of people's living standards, people's demand for electrical appliances are constantly moving to the existing. The existing fan are equipped with deferent regulators such as manual speed regulator or a remote controlled speed regulator where a person needs to manually set the speed of the fan. Such becomes a difficult task for people to wake up in the night and adjust the speed of the fan & more difficult task when it comes to Old age people for whom waking up in the midnight is very challenging looking to their age & in worst of the scenarios accidents can happen while reaching to Fan regulators for changing the speed of the fan and/or are not proficient using the puzzling remote controls. Day by day there is one or the other alternate technologies getting in to the market but there is an instant need to provide an invention that can overcome the difficulties and provide an economic and reliable energy efficient / saving solution, as well meets the requirements of maintaining constant room temperature.

Summary of the Invention

The present invention is a Fan speed Controller based on room temperature. The temperature controlled electric fan speed regulator comprises an alternating-current power supply, a direct-current power supply, a microcontroller, a display, a coupling circuit, wherein the components are electrically connected to complete the circuit. The temperature controlled electric fan speed regulator can automatically regulate the speed of an electric fan according to the room temperature, is convenient to use, and has the advantages of simple ness in manufacturing, stable performance, convenience in installation and debugging, and longer service life, thus being generalized favourably.

Brief Description of drawing

Fig.l represent the circuit block diagram of the present invention.

Detailed Description of the Invention

The present invention relates to the electric fan speed regulator. More particularly, the present invention relates to a Fan speed Controller based on room temperature, i.e., it controls the speed of the fan with respect to the room temperature. Automatic fan speed regulator is the device that automatically regulates the speed of the fan according to the surrounding temperature.

The present invention can automatically adjust the wind speed of the electric fan according to the indoor temperature, and is easy to use, has the advantages of simple production, stable performance, convenient installation and operation, and long service life.

As shown in Fig. 1,:

The present invention comprises an AC power supply, Push buttons/Regulator, a Zero crossing detector, and a control circuit containing a resistor, a TRIAC controller, and a display unit all connected electronically to form a complete circuit. The AC power supply supplies power to Zero crossing detector and Microcontroller, wherein the zero crossing detector will synchronize with the TRIAC through microncontroller to generate the output signal to the fan. Microncontroller receives temperature information through the push buttons and sends command to TRIAC for controlling the speed when in the auto mode.

The present invention further comprising mode adjustment switch/regulator, which contains a LED to display the mode in operation wherein the Green Light describes the Auto mode when the Red light describes that Manual mode. Manual mode provides free access to the user to change the fan speed as per the requirement. To change the mode of operation the user has to press the push buttons for 3-5 seconds.

In another embodiment the regulator also forms a part of the invention, wherein regulator in Zero position indicates the circuitry in auto mode, which will be indicated by Green LED light & when regulator is switched to Position 1,2,3, etc., the fan speed is controlled manually which will be indicated by constantly glowing Red LED light. During the course of manual operation the auto circuitry will remain in OFF / Sleep mode. The same can wake up / can turn to ON State by turning the regulator back to 'Ο' Zero position.

The control circuit includes a resistor, a TRIAC controller, and a display unit where the signal from zero crossing detector will synchronize with the TRIAC through microncontroller to generate the output signal to the fan.

The microcontroller used in the present invention are COTEX MO microcontrollers. The microcontroller receives the set temperature data through the push buttons and the command sent to TRIAC for controlling the fan speed.

After the power is turned on, to output the square wave pulse signal with adjustable duty cycle from the signal output terminal integrated circuit IC, so that the TRIAC is triggered to turn on and drive the fan motor M to run.

In operation when power is turned on the power supply supplies power to Zero Crossing Detectors and Microcontrollers, from wherein Zero Crossing Detectors synchronized with the TRIAC through the microcontroller and microcontroller receiveing the temperature data and out put is generated to run the fan accordingly.

When the indoor ambient temperature increases, the thermistor RT resistance decreases, so that IC control terminal voltage rise, the signal output side of the square wave pulse duty cycle increased TRIAC conduction angle increase, fan motor in the unit time power longer time, running time, speed up, thus increasing the air volume to achieve the purpose of cooling. On the other hand, when the indoor ambient temperature drops, the resistance of the thermistor RT increases, so that the control terminal voltage of the integrated circuit IC decreases, the duty cycle of the output side of the signal output decreases, and the TRIAC turns on. The fan motor becomes shorter in the unit time, the running time is shortened and the rotational speed is reduced, thereby reducing the air flow and causing the room temperature to rise.