I am developing a phase shift converter for battery system using F28335. I found there is a gate signal loss issue in transient.
The issue can be described as:
When the close-loop feedback control is applied to the proposed high resolution phase-shift modulation scheme, there is the issue of gate signal loss for the low voltage side full bridges with the dynamic feedback control where the phase-shift angle is adjusted in real-time mode.
at the beginning the high resolution phase-shift register TBPHSHR is lower than the value of CPMA3. Then the controller updates the phase-shift angle or TBPHSHR register value, which is larger than CPMA3. At the instant
highlighted by the circle, the counter 1 reaches zero and the new phase-shift register value is updated for both counter 2 and counter 3. Since the new TBPHSHR value is higher than CPMA3, the counter 3 and CPMA3 loses an event to set Vgs41 & Vgs51 to zero in the next switching cycle, resulting in all the switches in a low voltage full bridge being turned on simultaneously. This is an error or fault state because it shorts the battery pack and also shorts the low voltage winding of the transformer for at least one and a half switching cycle.
Can anyone help me to avoid this from happening.
