Abstract
High-voltage gain conversion is necessary for several applications, especially for low voltage renewable source applications. In order to achieve a high-voltage gain, the presented paper proposes a class of transformerless DC-DC converters based on three switched-capacitor networks. The proposed converters have the following characteristics: reduced voltage stress on the capacitors and power devices; obtained high voltage gain with small duty cycle; and reduced conduction losses in the power switches. To verify the operation principle of the proposed converters, the detailed analysis in different conditions of the proposed converters and a comparison considering existing topologies are also discussed in the paper. Moreover, the parameter selection and controller design for the converters are determined. Finally, to reconfirm the theoretical analysis, both the simulation and experimental results taken from a 400 W prototype operating at 60 kHz are given.
Highlights
Nowadays, we are facing global surface temperature, the energy crisis and environmental pollution problems
In order to provide the boost ability and reduce the duty cycle of the switches in the range of 0 to 0.5, the transformer-less DC-DC converter with Z-source network, which combines two capacitors and two inductors connected in an X-shape, has been presented in [22]
When K < 0.096, the converter expresses in discontinuous conduction mode (DCM) with several colored curves with
Summary
We are facing global surface temperature, the energy crisis and environmental pollution problems. For non-isolated structures, the conventional boost DC-DC converter including two semiconductors (one switch and one diode), one inductor and one capacitor is commonly provided to convert a low voltage source into a high DC-bus voltage with simple circuit and low cost. Many step-up DC-DC converters have proposed to achieve high voltage ratios without isolated transformers or couple inductors. In order to provide the boost ability and reduce the duty cycle of the switches in the range of 0 to 0.5, the transformer-less DC-DC converter with Z-source network, which combines two capacitors and two inductors connected in an X-shape, has been presented in [22]. In order to further achieve the high voltage gain, a combination of two switched-capacitor cells and energy storage cell has been proposed in [29].
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