Should the structural engineer know EMC knowledge?
2016-12-06 16:37:53 Source:Shenzhen YLZ technology co., LTD Author:Admin Visit:333
We often communicate with the corporate R & D person in charge of cooperation and found that such a phenomenon: EMC problem seems to be just a matter of hardware personnel to solve the problem of EMC is also the important task of hardware personnel! Arrangements for training or technical exchanges are also mainly hardware personnel things, there are few structural personnel involved! Seems to have nothing to do with them! In fact, the emergence of EMC problems with the structure and the staff have a very big responsibility!
First of all, the structure is metal equipment, the structure of the product design for EMC performance impact of a large proportion of such equipment space radiation problem can be reduced by shielding measures! If we do not rely on the general use of computer chassis shield is difficult to meet the EMC standards. So the structure of the gap of the lap, the structure of the opening hole, the structure and the cable connector lap will easily lead to product space radiation exceeded. In addition, the overlap is not easy to lead to poor electrostatic discharge, resulting in static string into the board lead to system abnormalities!
For the plastic shell equipment, such as MP3, mobile phones, terminal equipment, there is no ground discharge, such equipment is usually no problem with discharge, but the air discharge often a problem, electrostatic sensitive points mainly in the equipment gap or hole. If the hardware to solve more trouble, because the static has been string into the board, by filtering and PCB design uncertainty is relatively large, but if the plastic structure of the upper and lower cover overlap or gap, the design of electrostatic creepage distance, if the system needs Test through the air discharge 6KV, then the general retention of 6mm creepage distance can guarantee 6KV air discharge can not be carried out. This design to eliminate a certain voltage electrostatic discharge occurred at the same time to avoid the accumulation of electrostatic damage effect.
Although EMC issues need to be addressed from a system standpoint, in some cases it may be more convenient to structure the solution. Therefore, structural engineering is also must master certain EMC design skills, in order to meet the EMC performance requirements of products, structural engineers should master the following EMC design content:
1, metal shielding shell design, you need to consider different parts of the lap, the size of the aperture aperture, hole spacing, how to use conductive material overlap, cable connector design lap;
2, the plastic shell, vents and device veneer distance, gap maze structure designed to ensure that the electrostatic creepage distance.
3, of course, must also understand some basic knowledge of EMC.
First of all, the structure is metal equipment, the structure of the product design for EMC performance impact of a large proportion of such equipment space radiation problem can be reduced by shielding measures! If we do not rely on the general use of computer chassis shield is difficult to meet the EMC standards. So the structure of the gap of the lap, the structure of the opening hole, the structure and the cable connector lap will easily lead to product space radiation exceeded. In addition, the overlap is not easy to lead to poor electrostatic discharge, resulting in static string into the board lead to system abnormalities!
For the plastic shell equipment, such as MP3, mobile phones, terminal equipment, there is no ground discharge, such equipment is usually no problem with discharge, but the air discharge often a problem, electrostatic sensitive points mainly in the equipment gap or hole. If the hardware to solve more trouble, because the static has been string into the board, by filtering and PCB design uncertainty is relatively large, but if the plastic structure of the upper and lower cover overlap or gap, the design of electrostatic creepage distance, if the system needs Test through the air discharge 6KV, then the general retention of 6mm creepage distance can guarantee 6KV air discharge can not be carried out. This design to eliminate a certain voltage electrostatic discharge occurred at the same time to avoid the accumulation of electrostatic damage effect.
Although EMC issues need to be addressed from a system standpoint, in some cases it may be more convenient to structure the solution. Therefore, structural engineering is also must master certain EMC design skills, in order to meet the EMC performance requirements of products, structural engineers should master the following EMC design content:
1, metal shielding shell design, you need to consider different parts of the lap, the size of the aperture aperture, hole spacing, how to use conductive material overlap, cable connector design lap;
2, the plastic shell, vents and device veneer distance, gap maze structure designed to ensure that the electrostatic creepage distance.
3, of course, must also understand some basic knowledge of EMC.
