ePWM
7 - 26 TMS320F2837xD Microcontroller Workshop - Control Peripherals
approach offers an inexpensive solution that is independent of the control microprocessor, it is
imprecise, the component parameters must be individually tailored to the power converter, and it
cannot adapt to changing system conditions.
The second approach to shoot-through control separates transitions on complimentary PWM
signals with a fixed period of time. This is called dead-band. While it is possible to perform
software implementation of dead-band, the C28x offers on-chip hardware for this purpose that
requires no additional CPU overhead. Compared to the passive approach, dead-band offers
more precise control of gate timing requirements. In addition, the dead time is typically specified
with a single program variable that is easily changed for different power converters or adapted
on-line.
ePWM Dead-Band Sub-Module Registers
(lab file: EPwm.c)
Rising Edge Delay = T
TBCLK
x DBRED
Falling Edge Delay = T
TBCLK
x DBFED
Name Description Structure
DBCTL Dead-Band Control EPwmxRegs.DBCTL.all =
DBCTL2 Dead-Band Control 2 EPwmxRegs.DBCTL2.all =
DBRED 14-bit Rising Edge Delay EPwmxRegs.DBRED =
DBFED 14-bit Falling Edge Delay EPwmxRegs.DBFED =
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