A new method for deriving isolated DC-DC converter with single-stage power conversion is proposed in this project. The semiconductors, conduction losses, and switching losses are reduced significantly by integrating the interleaved DC converters into the full-bridge diode-rectifier. Various high-frequency bridgeless DC rectifiers are harvested based on different types of interleaved DC converters, including conventional DC converters and high step-up DC converters with soft switching.
The non-isolated DC cell in the non-isolated two-switch DC-DC converter with an isolated DC cell, the structure of the IBB converters presented. Although a wide voltage gain range with flexible control can be achieved, it should be noted that the conversion efficiency will be hurt by the cascaded two-stage conversion architecture due to the additional conduction and switching losses.
Based on the proposed dc to dc converter with soft switching capability can be derived by employing the input stage of an isolated DC converter as the primary-side circuit of the IBB converters. The primary-side circuit can be full-bridge, half-bridge, or three-level half-bridge, etc., as shown. Since the focus of this paper is the DC rectifiers, only the IBB converter topologies with full-bridge input stage are shown. Obviously, the input stage of the IBB converter is a DC-cell, and the two cells are linked by a high-frequency inductor and transformer. This structure is similar to the non-isolated two-switch DC-DC converter.
BLOCK DIAGRAM EXPLANATION
The input supply is fed to the isolated DC-DC converter. Present-day fast converters operate at much higher switching frequencies chiefly to reduce the weight and size of the filter components. As a consequence, switching losses now tend to predominate, causing the junction temperatures to rise. Special techniques are employed to obtain clean turn-on and turn-off of the devices. And the converter operates depending on the load. The converter is controlled by a driver circuit and operates by using a PIC controller.
- PIC Controller
- Driver Board
- Matlab/ Simulink
- The voltage stresses of the semiconductor in the DC-rectifier are reduced significantly due to the voltage multiplier. Hence low voltage rated devices with better conduction and switching performance can be used to improve efficiency.
- Soft switching within the whole operating range has been achieved for all of the active switches and diodes respectively by adopting the optimized phase shift control.