If there is an English word for reset, it means restoring the factory settings. Home routers generally do not have a switch, because most of them are powered by the power adapter, and the power will be cut off if the power adapter is unplugged or the power switch is turned off.
How does the function of the non-self-locking key switch contact the shrapnel for contact conduction? With overcharge and discharge protection circuit, the limit protection battery non-self-locking key switch mainly controls the size of the current.
< /span>Solution: software delay debounce (actually a kind of ignorance) and hardware debounce software judgment: switch closed - delay - delay - is it still closed? ——If it is determined to be open, software solutions can reduce costs, but sometimes hardware deterioration beyond the range of delay will cause failures.
Hardware solution: A dedicated debounce chip or a bistable debounce circuit is assembled by yourself, which is an RS flip-flop composed of two NAND gates.
Key Switch Features:
Rated value: generally refers to the value 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): the switch will have a locking action after pressing the handle is called self-locking, and the one without locking action 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 at which the key switch manufacturer will not cause insulation damage after applying high voltage to the specified measurement site for 1 minute.
Contact resistance: Indicates the resistance of the contact portion of the contact, but generally indicates the resistance value including the resistance of the spring and the conductor at the terminal portion.
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 refers to the impact range that the contact closed due to impact does not separate within a specified time when the key switch is in use.
The key switch has the advantages of small contact resistance load, accurate operating force error, and diversified specifications. It has been widely used in electronic equipment and white goods, such as audio and video products, digital products, remote controls, communication products, and household appliances. , Security products, toys, computer products, fitness equipment, medical equipment, money detector pens, laser pen buttons and so on. Because of the environmental conditions of the key switch (elastic force with pressure less than 2 times/environmental temperature and humidity conditions and electrical performance), large equipment and high-load buttons are directly replaced by conductive rubber or dome switch hardware shrapnel, such as medical equipment, TV. machine remote control, etc.
