A Novel High Step-up DC/DC Converter Based on Integrating Coupled Inductor and Switched-Capacitor Techniques for Renewable Energy Applications

 

ABSTRACT

 

The suggested structure consists of a coupled inductor and two voltage multiplier cells, in order to obtain high step-up voltage gain. In addition, two capacitors are charged during the switch-off period, using the energy stored in the coupled inductor which increases the voltage transfer gain. The energy stored in the leakage inductance is recycled with the use of a passive clamp circuit. The voltage stress on the main power switch is also reduced in the proposed topology. Therefore, a main power switch with low resistance RDS(ON) can be used to reduce the conduction losses.

 

 

 

 

 

CIRCUIT DIAGRAM

 

EXISTING SYSTEM:

Some transformer-based converters like forward, push–pull, or flyback converters can achieve high step-up voltage gain by adjusting the turn ratio of the transformer. However, the leakage inductor of the transformer will cause serious problems such as voltage spike on the main switch and high power dissipation. In order to improve the conversion efficiency and obtain high step-up voltage gain, many converter structures have been presented. Switched capacitor and voltage lift techniques have been used widely to achieve high step-up voltage gain. However, in these structures, high charging currents will flow through the main switch and increase the conduction losses. Coupled-inductor-based converters can also achieve high step-up voltage gain by adjusting the turn ratios. However, the energy stored in the leakage inductor causes a voltage spike on the main switch and deteriorates the conversion efficiency.

 

PROPOSED SYSTEM:

          This paper presents a novel high step-up dc/dc converter for renewable energy applications. The suggested structure consists of a coupled inductor and two voltage multiplier cells in order to obtain high-step-up voltage gain.

In addition, a capacitor is charged during the switch-off period using the energy stored in the coupled inductor, which increases the voltage transfer gain. The energy stored in the leakage inductance is recycled with the use of a passive clamp circuit. The voltage stress on the main power switch is also reduced in the proposed topology.

Therefore, a main power switch with low resistance can be used to reduce the conduction losses. The operation principle and the steady-state analyses are discussed thoroughly. To verify the performance of the presented converter, laboratory prototype circuit is implemented. The results validate the theoretical analyses and the practicability of the presented high-step-up converter.

 

 

BLOCK DIAGRAM:

INPUT DC supply

Coupled Inductor Integrated with switch

Clamping circuit

Voltage multiplier cells

OPTO coupler circuit

BUFFER circuit

PIC controller circuit

12 V DC

Load

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TOOLS AND SOFTWARE USED:

• MP LAB
• ORCAD/PSPICE
• MATLAB/SIMULINK

 

OUTPUT:

• HARDWARE
• SIMULATION

 

REFERENCE:

Ali Ajami, Hossein Ardi, and Amir Farakhor, “A Novel High Step-up DC/DC Converter Based on Integrating Coupled Inductor and Switched-Capacitor Techniques for Renewable Energy Applications”, IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 30, NO. 8, AUGUST 2015.