Siemens Simodrive Power Supply Line Noise PCB Clone
Siemens Simodrive Power Supply Line Noise PCB Clone can reproduce a printed circuit board in the precontext of all the productive documents are absent by extract layout, gerber file and schematic from existing PCB board;
PCB Clone will inevitably encounter the noise issue from power supply line, when the emergence of electro-magnetic interference on the digital circuit, the main reason is on the power supply line and grounding line, use oscillograph to monitor the obvious noise voltage. Although there are a lot of people can assure that these noises is the main cause for electro-magnetic interference when restore wiring diagram from PCB, but normally has no effective measures to deal with them, in order to achieve the purpose of noise elimination, it is necessary to understand the generating source of these noises:
1, noise from the power supply line:
From the graphic below, there is a typical gate circuit output terminal, when the output is high electrical level, Q3 is open circuit, Q4 cut out; when the output is low electrical level, Q3 cut out, and Q4 is open circuit. Both these two status can form the high impedance value, which can restrict the current from power supply.
When the status of PCB circuit change, Q3 and Q4 will bring to connection together in a transient moment, and this moment there will be a transient low impedance value occurs between the power supply and ground, it will generate like 30-100mA peak value current.
And when the gate output electrical level turns from low to high, power supply will not only keep the output current, but also charge the capacitor which makes the current value reach saturation. Due to there is different level of conductance value on the power supply line when clone pcb card, as a result of that, when current start to muted, sensible voltage will emerge. And the noise on the power supply line can be monitored. Also due to the existence of power supply line impedance, the voltage will fall in the short time.
Tags: копировать pwb bom,копировать pwb gerber,копировать pwb schematic