Causes and processing methods of dithering of keyswitch
Release time：2018-11-19 Clicks： Click
What is the reason for the keyswitch when it is shaking? How should we deal with it? Now let's give you a detailed introduction.
The reason why the keyswitch is quivering is:
The scanning frequency of dynamic display can't be lower than 25Hz in theory. In practice, it usually takes more than 30Hz to have better display effect. It is normal to show when you don't press the button. It flutters when you press the button, because the scanning frequency can satisfy the display requirement when you don't press the button. After pressing, the program increases. And many delays and other reasons make the scanning frequency unable to meet the demand, so that there is a "jitter" appearance, key switch suppliers.
How to deal with the jitter of button switches:
The link to deal with the problem is how to reduce the running time of the keyboard program to ensure that the scanning program can scan on time. It is advocated that some of the programs displayed in the scan should be placed in the continuous processing of the timekeeper. The keyboard switch can ensure the scanning frequency. In addition, the delay in some keyboard processing programs should be changed to the time-keeping process. Break.
Keyboard switch for some use of the structure is particularly serious, usually we will understand and understand the structure of the key switch, after finishing, we will communicate and communicate with you, so that we can better complete the use of keyboard switch after detailed understanding and more light cars when maintenance and replacement. A familiar road.
Presentation of key switch: a contact structure with small contact interval and fast-acting mechanism, which operates with prescribed stroke and force, is covered with a shell, and a switch with drive rod (hereinafter referred to as switch) has contact: in the type of switch, compared with semiconductor switch with switch characteristics, it passes through. Machine keys, switch devices and switches of contacts are used to realize the functions of switches. Contact forms: Electrical input and output circuits of contacts are formed according to various uses.
The characteristics of keyswitch are as follows:
Rated value: generally refers to the value used as the reference to guarantee the switching characteristics and performance, such as rated current, rated voltage and so on. Its premise is specific conditions (load type, current, voltage, frequency, etc.).
Operation mode (self-lock/unlock): When the handle is pressed, the switch will have a locking action called self-lock, and the unlocked action is called unlock.
Insulation resistance: refers to the value of resistance between non-connected terminals, between terminals and non-charged metal parts, between terminals and ground.
Voltage withstanding: The critical value of insulating damage will not be caused by the high voltage added by the key switch manufacturer for 1 minute at the specified measuring position.
Contact resistance of key switch: It represents the resistance of contact part of contact point, but generally represents the resistance value of conductor resistance including spring and terminal part.
Vibration resistance: When the vibration key switch is used by misoperation, because the vibration closed contact points are not separated in the vibration range within the specified time.
Impulse Resistance: Durable impact means that the key switch will not be damaged by the mechanical impact during transportation or installation. V meets the impact within the range of action characteristics. Misoperation impact means that when the key switch is used, the contact closed by the impact will not be separated within the specified time.