UG Project PPT

Transformer-less Voltage Quadrupler DC Converter With

PV input JOSE J ABRAHAM (312311105053) JOHN PETER RAJA D(312311105052) GUIDED BY– DR ARUNACHALAM ASSOCIATE PROFESSOR

St. Joseph’s College of EngineeringD EDEPARTMENT OF EEE

OBJECTIVE

• To implement voltage quadrupler DC to DC converter

• 1)To achieve High voltage gain by interleaving technique

• 2)Without transformer

• 3)To Reduce number of switches

• 4)To Reduce the voltage stress of both active switches and diodes

DRAWBACKS

• snubber needed

• leakage inductance is more

• filter value is high

• more number of switches

• Losses due to transformer

FULL BRIDGECONVERTER

CONVENTIONAL METHOD 1

The DC-DC converter to set up the voltage level using transformer. The transformer is used to increase or decrease the output voltage (depending on the transformer ratio).

Conventional Simulation Circuit Diagram :

The above fig shows conventional simulation circuit diagram.

Input Voltage Waveform :

The fig shows the simulated input voltage for the Conventional circuit in MATLAB.

Output Voltage and Current Waveforms :

The fig shows the simulated output Voltage and current for conventional circuit in MATLAB.

Conventional isolated converters, such as flyback converters, can achieve high voltage

gain by adjusting the turn ratio of the transformer.

Conventional method 2 –flyback converter

Drawbacks

•High voltage spikes

•Transformer ratio high

•Low efficiency

Advantages

Single switch

SIMULATION CIRCUIT DIAGRAM:

INPUT VOLTAGE:

OUTPUT VOLTAGE AND CURRENT:

The proposed topology utilizes input-parallel output-series configuration and is derived from a two-phase interleaved boost converter for providing a much higher voltage gain without adopting an extreme large duty cycle and reduces the voltage stress of both active switches and diodes.

QUADRUPLER CIRCUIT

MODE 1 – MODE 3:

During Mode 1, switches S1 and S2 are turned ON,D1a,D1b,D2a,D2b are all OFF.

MODE 2:

During Mode 2: For this operation mode, switch S1 remains conducting and S2 is turned OFF . Diodes D2a and D2b become conducting.

MODE 4:

During Mode 4,For this operation mode, switch S2 remains conducting and S1 is turned OFF. Diodes D1a and D1b become conducting.

BLOCK DIAGRAM

SIMULATION CIRCUIT DIAGRAM:

Simulation Circuit Diagram - Transformer-less Voltage Quadrupler DC Converter is shown in Fig:

INPUT VOLTAGE

Simulated input voltage - Transformer-less Voltage Quadrupler DC Converter is shown in Fig:

OUTPUT VOLTAGE:

Simulated Output voltage - Transformer-less Voltage Quadrupler DC Converter with is shown in Fig:

OUTPUT CURRENT:

Simulated Output current -Transformer-less Adaptable Voltage Quadrupler DC Converter with Low Switch Voltage Stress is shown in Fig:

VOLTAGE STRESS ACROSS - SWITCHES S1 AND S2 and DIODES D1A,D2B,D2A,D1B :

Simulated Voltage stress across switches S1 and S2 and diodes D1A,D2B,D2A,D1B of the Transformer-less Voltage Quadrupler DC Converter is shown in Fig:

Mathematical analysis

PV MODULE DESIGN

MODIFIED CIRCUIT SIMULATION WITH PV INPUT

SIMULATED – INPUT VOLTAGE

SIMULATED – OUTPUT VOLTAGE

•High step up voltage gain.

•Voltage stress is reduced.

•Efficiency is high.

•Automatic uniform current sharing characteristic of the two interleaved phases for voltage boosting mode.

•Battery backup systems for uninterrupted power supplies.

•Stand alone power supply

•DC drives

ADVANTAGES:

APPLICATIONS:

[1] R. W. Erickson and D. Maksimovic, Fundamentals of Power Electronics,2nd ed. Norwell, MA, USA: Kluwer, 2001.

[2] Q. Zhao, F. Tao, F. C. Lee, P. Xu, and J.Wei, “A simple and effective to alleviatethe rectifier reverse-recovery problem in continuous-current-mode boost converter,” IEEE Trans. Power Electron., vol. 16, no. 5, pp. 649–658, Sep. 2001.

[3] Q. Zhao and F. C. Lee, “High-efficiency, high step-upDC–DCconverters,” IEEE Tran s. Power Electron., vol. 18, no. 1, pp. 65–73, Jan. 2003.

[4] W. Li and X. He, “Review of non-isolated high step-up DC/DC converters in photovoltaic grid-connected applications,” IEEE Trans. Ind. Electron., vol. 58, no. 4, pp. 1239–1250, Apr. 2011.

[5] N. P. Papanikolaou and E. C. Tatakis, “Active voltage clamp in flyback converters operating in CCM mode under wide load variation,” IEEE Trans. Ind. Electron., vol. 51, no. 3, pp. 632–640, Jun. 2004.

REFERENCES