Big power electromagnetic compatible switch

Abstract

The invention provides a big power electromagnetic compatible switch. The switch comprises an electric circuit, a power supply and a device. The invention adopts a soft-switching technique that: firstly, interference factors are directly eliminated by inhibiting an interference source; secondly, coupling and radiation between the interference source and the interfered equipment are eliminated so as to cut off the transmission route of the electromagnetic interference; and thirdly, the anti-interference ability of the interfered equipment is improved, the sensibility of the interfered equipment on noise is lowered, switch loss and switch noise are reduced. A buffer circuit is added to an input part of the switch control power supply, an EMI filter is added to an input and output circuit of the switch power supply, materials with good electric conductivity are used to shield electric fields, materials with high magnetic conductivity are used to shield magnetic fields, various measures are taken to achieve good anti-interference effects, so that the power switch is capable of resisting the electromagnetic interference and particularly meets related EMC standards in terms of lightning strike, surge, mains voltage, electric fields, magnetic fields, electromagnetic wave, static discharge, pulse train, voltage dip, RF electromagnetic field conduction anti-interference, radiation anti-interference, conduction emission, radiation emission and the like.

Description

technical field [0001] The invention relates to an equipment device of a power supply, in particular to an equipment device of a switching power supply. Background technique [0002] Switching power supplies generally use pulse width modulation (PWM) technology, which is characterized by high frequency, high efficiency, high power density, and high reliability. In addition, it also has the advantages of small size, light weight, and remote monitoring, so it is widely used In program-controlled switching, optical data transmission, wireless base stations, cable television systems and IP networks, it is the core power for the normal operation of information technology equipment. However, because its switching devices work in the high-frequency on-off state, the high-frequency fast transient process It is the source of electromagnetic interference (EMD) itself. The electromagnetic interference EMI signal generated by it has a wide frequency range and a certain amplitude. It wil...

AI Technical Summary

Problems solved by technology

[0002] Switching power supplies generally use pulse width modulation (PWM) technology, which is characterized by high frequency, high efficiency, high power density, and high reliability. In addition, it also has the advantages of small size, light weight, and remote monitoring, so it is widely used In program-controlled switching, optical data transmission, wireless base stations, cable television systems and IP networks, it is the core power for the normal operation of information technology equipment. However, because its switching devices work in the high-frequency on-off state, the high-frequency fast transient process It is the source of electromagnetic interference (EMD) itself. The electromagnetic interference EMI signal generated by it has a wide frequency range and a certain amplitude. It will pollute the electromagnetic environment through conduction and radiation, and cause interference to communication equipment and electronic products. Existence, the power grid of the input power has been disturbed, affecting other equipment, making it unable to work normally, and also affecting the power supply quality of the power grid