ePWM
7 - 28 TMS320F2837xD Microcontroller Workshop - Control Peripherals
Programmable options are available to support the magnetic properties and characteristics of the
transformer and associated circuitry.
Purpose of the PWM Chopper
Allows a high frequency carrier
signal to modulate the PWM
waveform generated by the Action
Qualifier and Dead-Band modules
Used with pulse transformer-based
gate drivers to control power
switching elements
Shown in the figure below, a high-frequency carrier signal is ANDed with the ePWM outputs.
Also, this circuit provides an option to include a larger, one-shot pulse width before the sustaining
pulses.
ePWM Chopper Waveform
EPWMxA
EPWMxB
CHPFREQ
EPWMxA
EPWMxB
OSHT
EPWMxA
Programmable
Pulse Width
(OSHTWTH)
Sustaining
Pulses
With One-Shot Pulse on EPWMxA and/or EPWMxB
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