A switching control strategy is prepared for single and dual inductor current-fed push-pull converters. The prepared switching control strategy can be used with both current-fed push-pull converters with an active voltage doubler rectifier, or active rectifier, in the secondary side of the isolation transformer.
The prepared switching control strategy makes turn-on and turn-off method of the primary side power switches zero-voltage-switching and zero-current-switching usually. The soft-switching operation of the single and dual inductor push-pull converters
with both types of active rectifier, is explained. Simulation and experimental results are supply to validate soft switching operation of the current-fed push-pull converters with the prepared switching control method.
- Single and dual inductor current-fed push-pull converter
- Active rectifier
Fig. 1. (a) Dual, and (b) single inductor CFPP converters with the secondary side voltage doubler rectifier.
EXPECTED SIMULATION RESULTS:
Fig. 2. U1 current (A) of dual inductor CFPP converter along with its switch control signal and corresponding secondary side switch (U4) control signal.
Fig. 3. Drain to source (VDS) voltage (V) of U1 and scaled (100:1) gate control signal of dual inductor CFPP converter.
Fig. 4. U1 current (A) of single inductor CFPP converter and control signal.
Fig. 5. Drain to source voltage (VDS) (V) and gate control signal (200:1) of U1 of single inductor CFPP converter.
Figure 6. U1 current (A) of dual inductor CFPP converter along with its switch control signal and corresponding secondary side switch (U4) control signal in mode II.
Fig. 7. U1 current (A) of single inductor CFPP converter along with its switch control signal in mode II.
A switching control method is planned for single and dual inductor CFPP converters with secondary side active rectifiers. The primary side power switches are turned-on and turned-off with ZVS and ZCS commonly with the help of synchronous operation of the secondary side power switches.
The gain growth of CFPP converters due to the planned switching method is tell under two modes of operation with similar switching quality. The work dependency of the switching control strategy on the leakage inductance of the isolation transformer is critically consider.
A detailed theoretical analysis is provided assuming ideal circuit conditions. Simulation and experimental results are provided to further validate the operation of the proposed switching control strategy.
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