AM2434: Can PRU-ICSS PWM with Phase Shift Operate at 96 kHz?

Ogata Tokoku

Part Number: AM2434

I have a question about the PRUICSS PWM sample.

Sample: PRU-ICSS PWM WITH PHASE SHIFT

Under the following conditions, I would like to operate with a carrier frequency of 96 kHz.
Is this possible? (By changing "PWM_OUTPUT_FREQ" in the code to 96000 and outputting the PWM waveform.)
If not, how high can the frequency be increased, and what is the limiting factor?

Conditions

Output 3-phase gate signals:
UP/UN, VP/VN, WP/WN (3 pairs). Each pair should be complementary outputs.
Target motor: single axis.
Carrier frequency and dead time will not change during operation.
Duty cycle will change during operation.

9 months ago

0 Manoj Koppolu 9 months ago

TI__Intellectual 1920 points

Hi,

Ogata Tokoku said:
UP/UN, VP/VN, WP/WN (3 pairs). Each pair should be complementary outputs.

Do you need phase shift also between 3 pairs ?

Ogata Tokoku said:
If not, how high can the frequency be increased, and what is the limiting factor?

Do you see any issues increasing to 96KHZ for the example in SDK? Maximum Frequency depends on number PWM signals required, phase shift configured.

Please go through PRU firmware at motor_control_sdk\source\pruicss_pwm\pruicss_pwm_with_phase_shift\firmware and comment out axis 2 and axis 3 related code, if you need only 6 PWM signals without phase-shift between 3 pairs and rebuild the PRU firmware.

Documentation for the example is available here :

https://software-dl.ti.com/processor-industrial-sw/esd/motor_control_sdk/am243x/11_00_00_06/docs/api_guide_am243x/EXAMPLE_PRUICSS_PWM_WITH_PHASE_SHIFT.html

Let us know, if you need any help.

Thanks & regards,
Manoj.

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AM2434: Can PRU-ICSS PWM with Phase Shift Operate at 96 kHz?