Gate charge profiler for power transistors

A gate charge profiler system, comprising:

• a power transistor comprising a gate that controls conduction between a drain and a source;
• a gate driver configured to drive the gate of the power transistor with a gate drive current in response to an input signal;
• a gate charge profiler, comprising:
• an analog comparator configured to generate a comparison signal when a drain-source voltage across the drain and the source equals a threshold voltage;
• and
• a timer arranged subsequent to the analog comparator and configured to output a time value based on input of a transition of the input signal and input of the comparison signal;
• and
• a controller, configured to:
• output the input signal to the gate driver and the timer;
• and
• calculate a value of a gate charge of the power transistor based on the gate drive current and the time value.

A method, comprising:

• driving, by a gate driver, a gate of a power transistor with a gate drive current in response to an input signal to control conduction between a drain and a source of the power transistor;
• comparing, by a voltage comparator unit, a drain-source voltage across the drain and the source and a threshold voltage to generate a comparison signal;
• determining, by a timer unit, a time value based on input of a transition of the input signal and input of the comparison signal;
• and
• calculating, by a controller, a value of a gate charge of the power transistor based on the gate drive current and the time value.