Introduction to the Requirements for the Use of Metal Key Switches
Release time：2019-08-19 Clicks： Click
What are the requirements for the use of metal key switches? Specific we need to know what content, specific details we will introduce to you below.
The characteristics of metal key switch:
Grounding: Metal key switch has more interference than linear power supply. Common mode interference sensitive power equipment should adopt grounding and shielding mode. According to the EMC constraints of ICE1000, EN61000 and FCC, the metal key switch adopts EMC method. Therefore, metal key switches should usually have EMC filters. If the HA series metal key switches with Lidworf technology ground their FG terminals or connect them to the user's situation, the above EMC requirements can be met.
(2) Maintenance circuit: Metal key switch in planning needs to have overcurrent, overheat, short circuit and other maintenance functions. Therefore, the metal key switch module with complete maintenance function should be preferred in planning. The technical parameters of the maintenance circuit should be matched with the operation characteristics of electrical equipment to prevent damage to electrical equipment or metal key switch.
(3) Expansion intention: The expansion direction of metal key switch is high frequency, high reliability, low power consumption, low noise, anti-interference and modularization. Because the key technology of metal key switch is high frequency, foreign major metal key switch manufacturers are committed to synchronously developing new high intelligent components, especially improving the loss of secondary rectifier materials, increasing the power ferrite (Mn? Zn) data, in order to achieve high frequency, high magnetic power and high flux density (Bs). Yes, capacitor miniaturization is also a key technology. The application of SMT technology in metal key switch has made great progress. Both sides of the circuit board are equipped with metal devices to ensure that the metal key switch is light, small and thin. Daiwa Electrical Appliances focus on metal key switches and other products.
High frequency: The high frequency of metal key switch will inevitably change the traditional PWM switch technology. Completing ZVS and ZCS soft switch technology has become the mainstream technology of metal key switch, greatly improving the operation efficiency of metal key switch. In terms of high fastness and reliability, American metal key switch manufacturers reduce the stress of equipment by reducing operating current and junction temperature, which greatly improves the reliability of products.
Modularization: Modularization is the general trend of metal key switch development. Modular power supply can be selected to form a distributed power supply system, and N + 1 redundant power supply system can be planned to achieve parallel expansion. In view of the shortcoming of high operating noise of metal key switch, if only high frequency is sought, the noise will increase. By choosing the circuit technology of partial resonant converter, high frequency noise reduction can be achieved theoretically. However, there are still some technical problems in the practical application of some resonant converter technology, so we need to do a lot of work in this field to master this technology. It is practical.
Introduction to the Characteristic, Principle and Connection Mode of Key Switch
The formation of these basic parameters allows us to use the button switch more clearly these problems, which can help us better choose the switch suitable for ourselves.