Editing Dead-time distortion
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# PWM to top transistor: PWM signal that is controls when the top side transistor is in conductive state. | # PWM to top transistor: PWM signal that is controls when the top side transistor is in conductive state. | ||
# PWM to bottom transistor: PWM signal that is controls when the bottom side transistor is in conductive state. | # PWM to bottom transistor: PWM signal that is controls when the bottom side transistor is in conductive state. | ||
− | # Grey areas: | + | # Grey areas: time when neither of PWM signals are in "on" state making both transistor non-conductive. This is necessary to prevent on-state overlapping and shoot-through currents from V+ to GND. |
# Positive current load voltage: this is the achieved (distorted) PWM signal on load when current direction is positive in load inductor. | # Positive current load voltage: this is the achieved (distorted) PWM signal on load when current direction is positive in load inductor. | ||
# Negative current load voltage: this is the achieved (distorted) PWM signal on load when current direction is negative in load inductor. | # Negative current load voltage: this is the achieved (distorted) PWM signal on load when current direction is negative in load inductor. | ||
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===Distortion elimination=== | ===Distortion elimination=== | ||
The bottom image shows the exactly same experiment with the one above but this time [[Argon (servo drive)]] dead time correction was turned on. Notice how dips almost completely disappear and PWM duty cycle setpoint shows more sine-like waveform. | The bottom image shows the exactly same experiment with the one above but this time [[Argon (servo drive)]] dead time correction was turned on. Notice how dips almost completely disappear and PWM duty cycle setpoint shows more sine-like waveform. | ||
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