PXS20RM Datasheet, PDF (655/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Flexible Motor Control Pulse Width Modulator Module (FlexPWM)
V+
Top Left
Submodule 0 _{Bottom Left}
Top Right
Submodule 1 _{Bottom Right}
Left Side
Right Side
Transformer
Figure 25-6. Phase Shifted PWMs Applied to a Transformer Primary
25.3.2.4 Double Switching PWMs
Double switching PWM output is supported to aid in single shunt current measurement and three phase
reconstruction. This method support two independent rising edges and two independent falling edges per
PWM cycle. The VAL2 and VAL3 registers are used to generate the even channel (labelled as PWMA in
the figure) while VAL4 and VAL5 are used to generate the odd channel. The two channels are combined
using XOR logic (see Figure 25-17) as shown in Figure 25-7. The DBLPWM signal can be run through
the deadtime insertion logic.
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
25-9