The difference between waterproof light touch switch and thin film switch and current control.
Difference between waterproof light touch switch and thin film switch
One switch is very similar to a waterproof light touch switch, called a membrane switch. The difference between a membrane switch and a waterproof light touch switch is that the membrane switch is a key with a circuit of its own. Usually the top layer is a printed or patterned panel made of materials such as PET or PC, the bottom layer is a conductive circuit, and the middle layer is an analog switch. A double-sided adhesive made of PET material that acts as an isolator. The lowest part is usually the contact and connection lines on the PET material. Membrane switch is easy to use and flexible, and can be customized to different colors, sizes and appearance according to different needs.
The maximum current of the touch switch is generally DC 12V, 50 mA.
Touch switch related knowledge:
Light touch switch in use must pay attention to the current, AC and DC circuit button switch ability is very different, need to confirm the rated DC occasion control capacity is very low. This is mainly because DC does not have zero points (current zero intersections) like AC, so once an arc is produced it is difficult to eliminate the arc and the arc takes a long time. And the current direction is unchanged, so there will be contact migration phenomenon, the contact will be unable to break due to uneven, may lead to misoperation.
The constant current and surge current of some types of load are quite different. It must be used in the allowed surge current range. The larger the inrush current, the greater the consumption and migration of the contacts, and the failure of the contacts can not be switched due to the fusion and migration of the contacts.
Light touch switch will produce reverse induction voltage in the case of inductance. The higher the voltage, the greater the energy, the greater the contact consumption and migration. Therefore, it is necessary to confirm the rated conditions and mark the control Valley in the rated value, but these are not enough. The voltage, current waveforms and load types are special when switching on and off. In the load circuit, it is necessary to verify the actual equipment separately. The field of micro voltage L and current requires the use of tiny load products. When using general purpose silver contacts, it may lead to contact reliability.