Deal with the problem of key switch jitter and vibration to understand its basic parameters

Classification：Key switch news

Author: AUGO Electronics

Release date：2022-02-20 21:58:18

The reason why the key switch vibrates and vibrates: .
In theory, the scanning frequency of dynamic display cannot be lower than 25Hz. In practice, it usually takes more than 30Hz to have a better display effect. It is normal for the display to appear when the button is not pressed. After pressing the button, the display vibrates. When the button is pressed, the scanning frequency can meet the display requirements. After pressing, the scanning frequency cannot meet the demand due to the increase of programs and many delays, so that the appearance of "vibration" appears, the key switch supplier.
How to deal with the jitter of the key switch: .
The key to solving the problem is how to reduce the running time of the key program to ensure that the scanning program can scan on time. It is recommended to place the program that scans the display part in the continuous processing part of the timer. The delay in some programs of key processing is changed to punctual interrupt.
The key switch is very serious about the structure when it is used. Usually we will understand and understand the structure of the key switch. After sorting out, we will communicate and communicate with everyone, so that we can better complete the key switch after a detailed understanding. use and become more proficient when repairing and replacing.
Introduction of key switch: a switch with a small contact interval and a snap action mechanism, a contact structure with a specified stroke and a specified force for switching action, covered with a shell, and a switch with a driving rod outside, (hereinafter referred to as the switch) has contacts: In the switch type, compared with the semiconductor switch with switching characteristics, the function of the switch is realized by the mechanical switch of the contact, and the contact form: the electrical input and output circuit of the contact is formed according to various purposes.
The characteristics of the key switch: .
Rated value: generally refers to the value that is used as a guaranteed reference for switching characteristics and performance, such as rated current, rated voltage, etc., which are premised on specific conditions (type of load, current, voltage, frequency, etc.).
Operation mode (self-locking/unlocking): After pressing the handle, the switch will have a locking action, which is called self-locking, and if there is no locking action, it is called no-locking.
Insulation resistance: refers to the resistance value between non-connected terminals, between each terminal and non-charged metal parts, and between each terminal and ground.
Withstand voltage: the critical value that the key switch manufacturer will not cause insulation damage after applying high voltage for 1 minute at the specified measurement location.
Button switch contact resistance: indicates the resistance of the contact part of the contact, but generally indicates the resistance value of the conductor including the spring and the terminal part.
Vibration resistance: When the malfunctioning vibration key switch is in use, the vibration range that the contacts closed due to vibration do not separate within a specified time.
Impact resistance: Durable impact means that the key switch will not be damaged by the mechanical impact during transportation or installation, and the impact within the range that meets the operating characteristics. Malfunction impact means that the key switch is used due to The shock range in which the contacts closed by shock do not separate within a specified time.

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