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Electric fan circuit with second-level protection function

A secondary protection and electric fan technology, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of human injury, limit the rotation space of electric fans, etc., and achieve adjustable detection distance and anti-corrosion. strong interference effect

Inactive Publication Date: 2012-06-20
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This protection method has certain dangers. If the electric fan fails to stop in time due to inertia, it will cause harm to the human body. There are also a few invention patents that use the detection device to realize the long-distance detection of the human body to achieve the purpose of timely protection of the human body. However, due to Its detection distance is fixed, which limits the rotation space of the electric fan, and fails to realize the combination of electric fan rotation and protection function well.

Method used

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  • Electric fan circuit with second-level protection function
  • Electric fan circuit with second-level protection function
  • Electric fan circuit with second-level protection function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] Specific implementation

[0014] The electric fan starts:

[0015] Such as figure 1 When the switch K is closed and the switch S is opened, the NE555 chip NE555 of the 555 time base integrated circuit 2 works in the reset state. At this time, its pin 3 output is at low level, so that the transistor BJT1 is turned on and BJT1 is turned on. After being switched on, a voltage drop is generated on the resistor R3 connected in series to its base b, and the current is limited by the potentiometer W to make the triac BCR conduct, so that direct current passes through the motor DJ to drive the fan to rotate.

[0016] Wind speed adjustment:

[0017] Such as figure 1 After the electric fan starts, adjust figure 1 The potentiometer W in the middle can realize the stepless speed regulation of the electric fan.

[0018] Infrared detection distance adjustment:

[0019] Such as figure 2 As shown, when the switch S is closed, the sensitivity of the infrared sensor is adjusted by adjusting the ...

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Abstract

The invention discloses an electric fan sensing automatic protector capable of adjusting a detection distance. The circuit of the protector comprises five parts, such as a 555 time-base integration circuit, a contactless switching circuit, an alarm sound analogue circuit, a power supply circuit and an infrared ray detection device and the like. According to the protector disclosed by the invention, a second-level human body protection device is designed, so that close-distance detection and long-distance detection can be carried out on human bodies, therefore the operations of automatic shutdown and sound prompting are realized, and the human bodies are effective to protect.

Description

Technical field [0001] The present invention relates to the field of electric fan protection and control, more specifically, the present invention relates to an electric fan circuit with a secondary protection function Background technique [0002] Checking the related patents of electric fans with the function of protecting the human body, it is found that most of the patents are aimed at protecting the human body by stopping the rotation of the fan when the human body touches the electric fan. "Touch the electric fan protection circuit that stops rotating" is an invention patent. This protection method is dangerous. If the electric fan fails to stop in time due to inertia, it will cause harm to the human body. There are also a few invention patents that realize the long-distance detection of the human body through the detection device to achieve the purpose of protecting the human body in time. The detection distance is fixed and the rotation space of the electric fan is limit...

Claims

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Application Information

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IPC IPC(8): F04D27/00H02H5/12
Inventor 黎翠凤李宏光
Owner LUDONG UNIVERSITY