Non-isolated DC-DC circuit board capable of resisting electromagnetic interference

Abstract

The invention discloses a non-isolated DC-DC circuit board capable of resisting electromagnetic interference. The non-isolated DC-DC circuit board comprises a printed circuit board, and a DC-DC powersupply chip, a filter capacitor, a rectifier diode and an energy storage inductor which are arranged on the printed circuit board, wherein the filter capacitor is connected to the input end of the DC-DC power supply chip, the rectifier diode and the energy storage inductor are connected to the output end of the DC-DC power supply chip, the rectifier diode is grounded, and the energy storage inductor is connected with the load; at the moment of switching-on or switching-off of an internal switch of the DC-DC power supply chip, the area enclosed by a generated current loop is a transient currentbackflow area, and a rectifier diode is arranged at a position close to the filter capacitor, so that the area of the transient current loop is reduced, and the magnetic flux is reduced to reduce electromagnetic interference. According to the non-isolated DC-DC circuit, the layout is more optimized, the area of the transient current loop is reduced while the area of the closed current loop and the area of the open current loop of the switching tube are minimized, and electromagnetic interference of the current loop to peripheral chips and signal lines is reduced.

Description

technical field [0001] The invention relates to the technical field of power supply circuits, in particular to an anti-electromagnetic interference non-isolated DC-DC circuit board. Background technique [0002] Non-isolated DC-DC power supplies are widely used in power electronics, military industry, scientific research, industrial control equipment, communication equipment, mobile communications, routers and other communication fields, as well as industrial control, automotive electronics, aerospace and other fields. With the continuous improvement of product performance requirements , the requirement for DC-DC power supply capability is getting higher and higher. Compared with the isolated DC-DC, the non-isolated DC-DC uses modules to build a power system, which has a shorter design cycle, high reliability, and easy system upgrades. The non-isolated DC-DC conversion is used in the same control board . When selecting, it will be selected according to the actual use of th...

AI Technical Summary

Problems solved by technology

[0005] At present, although the layout of the non-isolated DC-DC takes into account the minimization of the area of ​​the two main current loops, the closed current loop and the disconnected current loop of the switch tube, but less attention is paid to the transient current loop, so it is often designed There will still be electromagnetic interference in DC-DC circuits, so it is necessary to pay attention to issues related to transient current loops to optimize products

Images