When designing a vibration suppression drive controller, we need to consider several key factors to reduce or eliminate oscillations during the drive process. Here are some effective suppression methods and suggestions:
- Increase resistance: Adding a resistance between the gate and the source can suppress the oscillation caused by the LC oscillation circuit formed by the parasitic capacitance and the parasitic inductance. The value of the resistance is usually about 30Ω to avoid the current is too small and affect the charge and discharge speed of the capacitor.
- Use diodes: Adding diodes to the gate drive circuit can speed up the speed at which the MOSFET is turned off, especially if the capacitor discharge slows down after increasing the resistance. Schottky diodes are usually chosen because of their smaller voltage drop.
- Reduce the distributed inductance: When designing the drive circuit, minimize the distributed inductance, which can make the drive signal change from damped oscillation to exponential attenuation, thereby reducing the oscillation amplitude and high-frequency switching loss.
- Adjust the On and off time: By adjusting the on and off time of the MOSFET, you can reduce the amplitude of the oscillation. For example, the reverse parallel fast recovery diode on the drive resistance can change the MOSFET turn-on and turn-off time constants, so as to ensure a shorter turn-off time while increasing the turn-on time and reducing the voltage change rate.
- Using active vibration suppression technology: Active vibration suppression technology cancels the zero point of the shaper and the pole of the flexible system through feedforward open-loop control technology, avoiding the vibration mode of the excited object to eliminate residual vibration.
- Vibration suppression function: Some Servo drivers have vibration suppression function, which can reduce tracking errors, shorten load positioning time, and improve equipment production capacity through proprietary control algorithms at frequencies prone to vibration.
Through the above method, the vibration in the drive controller can be effectively suppressed, and the stability and performance of the system can be improved. In practical applications, it may be necessary to choose the most appropriate suppression strategy according to the specific circuit design and application scenario.
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