This document describes a high boost ratio hybrid transformer DC-DC converter for photovoltaic module applications. The converter aims to increase efficiency by reducing switching losses and current ripple while allowing for maximum power point tracking. It achieves an output efficiency over 96% by utilizing a hybrid transformer to simultaneously transfer inductive and capacitive energy. The converter was simulated and results showed the output voltage reaching over 500V with low ripple at the input of 40V, demonstrating its high boost ratio capability.

1. HIGH BOOST RATIO HYBRID TRANSFORMER
DC-DC CONVERTER FOR PHOTOVOLTAIC
MODULE APPLICATION
Under the guidance of
Mr.K.KRISHNA KUMAR
PRESENTED BY:
M.Anusha(11A21A0269)
L.Santosh kumar(11A21A0261)
M.Sai kumar(11A21A0262)
M.Rohith singh(11A21A0263)

2.  The main objective of this project is a high boost ratio hybrid
transformer is increasing the efficiency of the converter for
photovoltaic module applications.
 Switching losses are reduced.
 Able to implement maximum power point tracking(MPPT)
 Current ripple and conduction losses are also reduced.
 Output efficiency is greater than 96%
OBJECTIVES

3.  The main drawback of the converter there was a
High input current ripple.
 Output diode stresses are increased.
Light load efficiency of the converter is reduced
because of switching losses are more dominent
under light load condition.
PROBLEM IDENTIFICATION

4. Conventional systems
High step-up dc–dc converters using coupled-inductor and switched-capacitor
techniques.
(a) High-step coupled-inductor roboost dc-dc converter.
(b) High step-up dc-dc converter with coupled-inductor and switched-capacitor.

5.  PREVIOUS METHODS:
1.High step coupled inductor boost DC-DC converter
2. High step up DC-DC converter with coupled
inductor and
switched capacitor
 PROPOSED METHOD:
High boost ratio hybrid transformer DC-DC converter
SOLUTION METHODS

6.  The previous methods drawbacks are overcomed by using
high boost ratio hybrid transformer DC-DC converter.
This method is advantageous for a two stage PCS.
 By using this method, we achieve high level efficiency.
 The inductive and capacitive energy can be transferred
simultaneously to the high voltage DC bus.
 Increasing the total delivered power and decreases the
losses in the circuit.
 Adding resonant inductor and reducing the capacitance of
the switched capacitor in energy transfer path.
PROBLEM FORMULATION

7.  DC-DC conversion stage using PCS.
ABOUT PREVIOUS METHODS

8.  PCS accomplished single stage or double stage
 The double-stage PCS consists of a dc–dc conversion stage
that is connected to either a low power individual inverter.
 a high-power centralized inverter have multiple inverters.
 The high boost ratio dc–dc conversion stage of the PCS
requires a high efficiency.

9.  The high boost ratio DC-DC converter sare isolated or
non isolated .
 However, transformer-isolated converters tend to be
less efficient and more expensive due to the increased
manufacturing costs.
 A non isolated dc–dc converter with a high boost ratio
would be advantageous for a two-stage PCS
 Because it can be easily integrated with current PV
systems while reducing the cost and maintaining a
high system efficiency

10. Combination of coupled inductor and boost
converter:

11.  DC-DC converter with coupled inductor and switched
capacitor:

12.  The above methods was proposed to increase the boost
ratio without significant cost and efficiency penalties
 Light load efficiency of the converter is reduced because
switching losses were more dominant under light load
conditions.
 In this leakage inductance is produced. It provides severe
rigging and additional voltage stress on diode.
 Ripple current increased

13.  Now a days electric power is more important .
 Generating electric power from the renewable
energy sources.
 For that PV modules are increasing day by day.
 The output of the PV module is in b/w 20-45v.
 By using non isolated step up transformer DC-DC
converter
EXPLANATION

14. High boost ratio non isolated dc–dc converter ,a
clamp-mode couple-inductor buck–boost converter.
The converter’s leakage energy from the coupled-
inductor was recycled reducing the losses of the
system.
The output diode stress for this converter was similar
to that of a traditional fly back converter, i.e., higher
than the output dc bus voltage.

Another drawback of the converter was that there
was a high input current ripple due to the fact that
there was no direct energy
transfer path when the MOSFET was OFF.
Conventional System

15. EQUIVALENT CIRCUIT

16. C= input capacitor
HT= hybrid transformer with turns ratio 1:n
S1=active MOSFET switch
D1=clamping diode
Cc=clamped capacitor
Lr=resonant inductor
Cr=resonant capacitor

17. OPERATING MODES

18.  The important function of the dc–dc converter for PV
applications is being able to implement maximum
power point tracking (MPPT).
 This paper presents a non isolated, high boost ratio
hybrid transformer dc–dc converter with applications
for low-voltage renewable energy sources.
 The proposed converter utilizes a hybrid transformer
to transfer the inductive and capacitive energy
simultaneously.
 achieving a high boost ratio with a smaller sized.

19. From the circuit , we calculate boost ratio:
 The first flux balance on the magnetizing inductor of
hybrid transformer
Vcc =Vin/(1-D)
 Second flux, according to the flux balance on the
resonant inductor.
Vcr= nVin+Vcc =(n+1/(1-D))

20.  The last flux balance that governs circuit is voltage
second balance of the magnetizing inductor
VinD= (Vo-Vcr-Vin)/(1+n)*(1-D)
 The boost conversion ratio
Mb=Vo/Vin=n+2/n-D

21. BLOCK DIAGRAM

22. MODES OF OPERATION

23. SIMULATION CIRCUIT

24. 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1
-100
0
100
200
300
400
500
time(sec)
voltage(volts)
OUTPUT VOLTAGE

25. 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
time(sec)
current(amps)
OUTPUT CURRENT

26. 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1
39
39.5
40
40.5
41
Time(sec)
voltage(volts) INPUT VOLTAGE

27. 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1
0
50
100
150
200
250
Time(sec)
power(watts)
OUTPUT POWER

28. DESIGN PARAMETERS

29.  A high boost ratio dc–dc converter with
hybrid transformer suitable for alternative
dc energy sources with low dc voltage
input is proposed in this paper.
 The resonant conversion mode is
incorporated into a traditional high step-
up PWM converter with coupled-inductor
and switched-capacitor.
FUTURE SCOPE

30. CONCLUSION

31. 1. J.-S. Lai, “Power conditioning circuit topologies,”
IEEE Ind. Electron. Mag., vol. 3, no. 2, pp. 24–34, Jun.
2009.2
2. S. B. Kjaer, J. K. Pedersen, and F. Blabber, “A review
of single-phase grid-connected inverters for
photovoltaic modules,” IEEE Trans. Ind. Appl., vol.
41, no. 5, pp. 1292–1306, Sep./Oct. 2005.
REFERENCES