Brushless DC Motor Thermal Issues

[APDahlen]

Hello @tomz0840,

You likely already know this material, but you have inspired me to write the attached article. In the near future, I will have another showing how to get started with a breadboard version of the circuit.

Sincerely,

Aaron

Guide to Bootstrap Operation in a MOSFET Gate Drive Circuit

What is a bootstrap circuit? The term “bootstrap” evokes the image of a person pulling themselves up by their bootstraps. In electronics, the bootstrap circuit is defined as a circuit that uses the output signal to “pull up” on the input signal. In analog circuits, this technique is used to increase the input impedance of an amplifier or provide increased stage linearity. In switching circuits, the bootstrap is the energy source used to turn on the high-side MOSFET as shown in Figure 1. The boo…