All About Circuits

Gate-source voltage waveform in brushless motor drive

A

Thread Starter

Ashkan4818

Joined Jul 23, 2022
1
What should be the gate-source voltage waveform of the high side MOSFETs in a brushless motor drive with a trapezoidal control method?
1000005919.jpg
Are these parts marked in red in the picture above normal?

There is no such thing at the bottom side MOSFETs
1000005903.jpg

Schematic:
0kbCG.jpg


When I reduce the value of R47 and R57, this effect is reduced, but the drive is no longer able to rotate the motor

Can this event be due to BEMF or is it Miller effect?

How can I remove the part shown in the first picture without affecting the performance of the drive?
 
You must log in or register to reply here.
Thread starter Similar threads Forum Replies Date
M Possible Affect of Lower Gate to Source Threshold Voltage for an Inverter Application Power Electronics 9
achen How to change the threshold of voltage difference between source and drain when the gate voltage is zero Analog & Mixed-Signal Design 8
V MOSFET not conducting even when supplied with specified gate to source voltage Power Electronics 23
L Voltage spikes on the Gate-source of upper H-Bridge MOSFETs (for LLC converter) causing gate to source short failures Power Electronics 2
N MOSFET for appropriate Gate-Source voltage Power Electronics 3
Similar threads
Possible Affect of Lower Gate to Source Threshold Voltage for an Inverter Application
How to change the threshold of voltage difference between source and drain when the gate voltage is zero
MOSFET not conducting even when supplied with specified gate to source voltage
Voltage spikes on the Gate-source of upper H-Bridge MOSFETs (for LLC converter) causing gate to source short failures
MOSFET for appropriate Gate-Source voltage

You May Also Like

Top