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AFE539F1-Q1: Active discharge question

CHO SR
Genius 3415 points
Part Number: AFE539F1-Q1

Tool/software:

Hi TI Team,

The customer asks questions about the link's Active discharge.

Link: How to Reduce the Power Resistor for DC-Link Discharge in Traction-Inverter Applications

1. The resistance is reduced

2. Recommendation application or document request.

I don't understand the link document well, so I'm asking additional questions.

If you simply control PWM, the instantaneous power consumption is the same.

I think the initial power is the same even if I change the duty, how can I reduce the resistance?

Below is a brief description of the discharge circuit to see the trend.

V3 is the PWM Gate control signal waveform.

  • 0
    TI__Mastermind 36278 points

    Hello, 

    The effective resistance of the load resistor is changed as the PWM duty cycle is modulated by reducing the amount of time the resistor is connected to GND and the amount of current flowing through the resistor and FET. At the beginning of the discharge, the discharge should be slow, and then gradually get faster. It doesn't look like the PWM duty cycle is changing in the screenshot you shared. Try increasing the K parameter in the AFE539F1 so the response of the PWM output is larger. 

    Best,

    Katlynne Jones