First, the principle of touch switch chip
The basic working principle of the circuit is that the frequency of human body charging is the same as that of commercial power. When the human body touches the touchpad, it becomes the standard MOS level after being limited, amplified and shaped in the input buffer stage. When the touch duration is more than 32 milliseconds and less than 332 milliseconds, the control circuit of the control logic part is in the switch working state. When the touch duration is more than 332 milliseconds, the control circuit of the control logic part is in dimming working state, and the phase angle of the output trigger pulse changes continuously and periodically from 4 1 to 159, which is divided into three processes according to human perception: fast, slow and pause.
When the touch is over, the brightness memory will remember the phase angle. If the touch is applied for more than 32 milliseconds and less than 332 milliseconds, the phase angle will still be remembered by this part when the circuit is closed, so as to ensure that the originally selected phase angle and the original brightness of the light source will be maintained when the circuit is turned on next time. Phase-locked loop ensures the synchronization of trigger pulse and commercial power, and the working clock of the circuit is also generated by it. At the same time, the circuit also has the functions of remote control (that is, remote trigger) and gradual sleep (that is, from light to dark and finally closed), and its duration is set by external circuits.
Second, is the touch switch good?
Touch switch is a new product with the development of science and technology. Generally speaking, it refers to the wall switch designed by the principle of touch-sensitive chip, which is the replacement product of the traditional mechanical button wall switch. Touch switch can be more intelligent and convenient to operate, and has incomparable advantages over traditional switches. It is a very popular decorative switch for home products at present.
The touch switch is charged and self-sustaining under normal circumstances, so the power consumption is certain. Its service life is not as long as that of traditional switches. But it's really convenient.
Third, the touch switch manufacturer recommended
1, AJ brand touch screen switch under Zhongshan Ai Jia Electronic Equipment (Hong Kong) Industrial Co., Ltd., is suitable for indoor installation and has the advantages of backlight display and touch screen design.
2. Di Chin brand touch switch LN820 of Shenzhen Di Chin Lock Industry Co., Ltd. is widely used for intelligent lighting in hotels, hotels, apartments, offices, warehouses, factories, hospitals, family villas and other places ... The current price is 80 yuan/piece.
The above recommendation is about the principle of touch switch chip and the popularization of products in many aspects. From this, we can know that, first of all, touch switches are different from ordinary button switches. They can control the switch of electric appliances or lighting lamps with a touch. On the other hand, the touch switch occupies a relatively small area, because it can play the role of intelligent control and cannot be separated from a relatively small chip. So what is the working principle of this chip? Through the above, we can know before buying.
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