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Digital Signal Controllers
Twelve individually controlled enhanced PWM (EPWM) channels provide variable duty cycles for
high-speed switching in the converter bridge and battery charging circuits. Each of the EPWMs has its
own timer and phase register, allowing phase delay to be programmed in, and all of the EPWMs can be
synchronized to drive multiple stages at the same frequency. Multiple timers give access to multiple
frequencies, and fast interrupt management is available to support additional control tasks. Multiple
standard communication ports, including the CAN bus, provide simple interfaces to other components and
systems.
With integrated flash memories, F28x controllers enable straightforward program development and
updates while helping to protect intellectual property. Extensive third-party support is available for control
algorithms, including software modules for solar power inverters that have been developed and are in
development.
Figure 7 shows a multichannel buck converter driven by the independently timed EPWMs. All channels
can be run at different frequencies, as shown in the example, or the same frequency can be chosen for all
channels. For four channel frequencies, four EPWM modules are required. The choice of whether to run
the modules as masters or slaves depends on the frequency and synchronization requirements of the
system. If the channels are run as frequency multiples, it makes sense to synchronize, and a 1× master
and 3× slave configuration is appropriate. If the channels cannot be fixed at multiples, then all the modules
must be masters without synchronization, though resonance frequencies may be an issue. development.
Figure 7. Design Example - Multichannel Buck Converter
SPRAAE3 – May 2006 TMS320C2000™ DSP Controllers: A Perfect Fit for Solar Power Inverters 7
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