Interleaved High Step up Converter

Description

ABSTRACT

The proposed converter consists of switched capacitors and two coupled inductors. This combination can provide a relatively high voltage boost gain while operating with a small duty cycle. The converter can be powered either by one individual DC voltage source in an interleaved manner or two independent DC voltage sources as a multiport converter. The configuration of the proposed converter has advantages such as low power losses, longer lifetime of input sources due to non-pulsating input current, low voltage stress across the main switches, and slight output voltage fluctuation.

EXISTING SYSTEM

Generally, high voltage boost gain cannot be achieved us in conventional step-up converters since the parasitic parameters will set an upper limit on the duty ratio at which the converter can efficiently operate. In recent years many high step-up DC-DC converters have been proposed. Among the developed converters, the high step-up single switch converters exhibit large input current ripple which makes them unsuitable to operate at heavy load due to high conduction losses.

PROPOSED SYSTEM

The proposed interleaved high step-up converter is shown. The converter is composed of two coupled-inductors and four diode-capacitor voltage multiplier (DCVM) stages. Each DCVM stage consists of one diode and one capacitor. The DVCM stages are inserted between the input and output stages of the converter to enhance the voltage conversion ratio. By increasing the number of DCVM stages, it is possible to reach a higher voltage gain at a constant duty ratio. however, for simplicity and better understanding, four DCVM stages are used. The coupled inductors reside in the proposed converter so that a modified flyback forward interleaved structure is formed.

BLOCK DIAGRAM

BLOCK DIAGRAM EXPLANATION 

The proposed converter can be powered either by one individual DC voltage source in an interleaved manner or two independent DC voltage sources as a multiport converter. This converter combines the advantages of the coupled inductors with the diode-capacitor multipliers and hence a super step-up gain can be easily achieved with a minimum number of multipliers and low turns ratio of the coupled inductors while the converter operates at low duty ratio. The proposed converter exhibits high efficiency in a wide range of operations. It also presents low current ripples and low conduction losses which make it suitable for high power applications. In addition, the voltage stress across the switches and diodes is much lower than the output voltage.

CIRCUIT DIAGRAM

ADVANTAGES

• Low power losses,
• Longer lifetime of input sources due to non-pulsating input current, low voltage stress across the main switches.
• Slight output voltage fluctuation.

APPLICATIONS

• Renewable energy

HARDWARE REQUIREMENTS       

• PIC Controller

  

   

• Driver Board

  

SOFTWARE REQUIREMENTS

• Matlab / Simulink