The picture shows a phase in a motor drive. Are C4B and R5B absorbing spike voltages? The voltage is 60V. How is this type selected?
Dominika Posted on November 17, 2020
Filtered high frequency interference
In addition, inside the MOS tube: there is a capacitor between GS
The capacitance value is calculated according to the signal frequency
Mirna Posted on November 17, 2020
The capacitor is an absorbing capacitor, which needs to be selected according to the voltage spike generated by the parasitic inductance on the bus. The high-frequency non-inductive capacitor should be placed as close as possible to the MOSFET on the PCB.
That resistor seems to be the discharge resistor of the bus capacitor, the circuit is missing part.
Race Posted on November 17, 2020
How is the parasitic inductance on the bus produced?
Stevan Posted on November 17, 2020
Capacitors are absorption capacitors, and resistors and capacitors need to be selected based on the voltage spikes generated by the parasitic inductance on Vbus.
