Pwm2 Pwm1) - Texas Instruments Concerto F28M36 Series Technical Reference Manual

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7.3.9 Controlling Zero Voltage Switched Full Bridge (ZVSFB) Converter

The example given in

(modules). In such a case, control is achieved by modulating the duty cycle. It is also possible to

dynamically change the phase value on a cycle-by-cycle basis. This feature lends itself to controlling a

class of power topologies known as phase-shifted full bridge, or zero voltage switched full bridge. Here the

controlled parameter is not duty cycle (this is kept constant at approximately 50 percent); instead it is the

phase relationship between legs. Such a system can be implemented by allocating the resources of two

PWM modules to control a single power stage, which in turn requires control of four switching elements.

shows a master/slave module combination synchronized together to control a full H-bridge. In

this case, both master and slave modules are required to switch at the same PWM frequency. The phase

is controlled by using the slave's phase register (TBPHS). The master's phase register is not used and

therefore can be initialized to zero.

Figure 7-69. Controlling a Full-H Bridge Stage (F

Var = Variable

SPRUHE8E – October 2012 – Revised November 2019

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assumes a static or constant phase relationship between legs

C28 Enhanced Pulse Width Modulator (ePWM) Module

Applications to Power Topologies

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