This paper proposes current-fed resonating full-bridge encouragement DC/AC/DC convertor with zero -current exchanging technique. The proposed convertor is suited for the high electromotive force applications. However, since it controls the secondary switch to construct up the primary electromotive force during the really short period of clip, the ZCS operation is easy achieved without any extra conductivity losingss of magnetising current in the isolation transformer and resonating circuit. Furthermore, there are no extra circuits required for ZCS operation of power switches. Therefore, the proposed convertor can accomplish low EMI noise ensuing from the soft shift without any extra conductivity losingss. The chief of this paper is to imitate and hardware execution of current fed resonating full-bridge encouragement DC/AC/DC convertor. The public presentation of this convertor is observed by utilizing MATLAB simulation. The control circuit, power circuit and driver circuit are fabricated on general purpose PCB.Current-fed resonant full-Bridge encouragement DC/AC/DC Converter is implemented and the consequences observed by simulation are validated by the experimental consequences.

Index Terms- Bridge, current-fed, dc/ac/dc convertor, resonant.


A full span dc/ac/dc convertor is widely used in high power dc/dc application. Power electronic convertors are limited by high frequence application due to exchanging losingss in power shift devices.

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shift losingss are reduced by Turn on/Turn off the shift devices either at Zero electromotive force shift ( ZVS ) and/or zero current shift ( ZCS ) blink of an eyes.

The soft shift technique reduces the electromotive force /current emphasiss of chief switches & A ; achieve soft shift of the chief switch ‘s is a combination of the desirable characteristics of conventional switch manner convertor & A ; resonating convertor. MOSFET are progressively preferred for high power & A ; high frequence application because of low conductivity loss, low cost & A ; high frequence capableness. It is located at the primary side of transformer. It besides achieves soft commuting for end product rectifier rectifying tubes. A proposed convertor circuit consists of resonating inductance and resonating capacitance.

Block diagram and description will be presented in subdivision II. The Proposed strategy convertor circuit diagram and description presented in subdivision III.Simulation consequence will be presented in subdivision IV. Section V will explicate the execution of DC/AC/DC convertor. Advantages of proposed circuit at the primary side of transformer are

Merely one L and C circuit required for full proposed strategy.

To accomplish Zero Current Switching.

To accomplish soft exchanging for end product of individual stage inverter.

Resonant inductance and resonating capacitance circuit helps to turn on/turn off the chief switch quietly.

Rearward recovery job of rectifier is eliminated.


All-switched manner convertors concerns transformer parasitic elements.

The transformer escape induction causes unwanted electromotive force spikes that may damage the circuit constituents.

The weaving electrical capacity may ensue in current spikes.

A critical factor that determines the size and the cost of a convertor is its operation frequence.


It achieves ZCS for MOSFETs.

It achieves soft commuting for end product rectifier rectifying tubes.

It provides simple construction.

It regulates the District of Columbia end product electromotive force without over shoot, with decreased shift losingss, compact size and high efficiency.

Rearward recovery job of rectifier rectifying tubes is eliminated.


Battery coursers and dischargers.

Uninterruptible Power Systems ( UPS ) .

Alternative energy systems.

Hybrid electric vehicles.

Medical X-ray imagination.


Figure: 2. Block diagram

The input AC supply is given to rectifier to covert AC into DC.This DC is given to individual stage full-Bridge inverter through filter to covert DC into AC.This AC is given to the isolation transformer. The isolation transformer end product is given to the full-bridge uncontrolled rectifier to covert AC into DC.The end product DC supply is given to the burden. The burden will be a DC motor Load. On/off procedure of MOSFET switch is controlled by pulsation width transition circuit ( PWM ) .


Figure: 3. Proposed Converter Circuit



Vin – Input signal Voltage

iL – Inductor Current

ir – Resonant current

T1 to T4 – MOSFETs

Lin – Input Inductor

Io – Output Current

CT1 to CT4 – MOSFET parasitic


L – Inductor

C – Transformer Parasitic


Ll – Transformer Escape


CF – Capacitive filter


A. Simulation circuit

Figure: 4a. Simulation Circuit

B. Simulation end product

Triping pulsations to MOSFET 1 & A ; 2

Figure: 4b. PWM pulsation for T1 and T2

Triping pulsations to MOSFET 3 & A ; 4

Figure: 4b. PWM pulsation for T3 and T4

Figure: 5. Current Vs Time

Figure: 6. Voltage Vs Time

Figure: 7. Enlarge end product of Current VsTime

Figure: 8. Enlarge end product of Voltage VsTime


This paper has presented a current -fed resonating full-bridge dc/ac/dc convertor system with transformer isolation. The dc/ac convertor is controlled by changing the control frequence and the changeless MOSFET turn-off clip. During the whole control scope, the MOSFET current and electromotive force wave forms do non overlap, so the exchanging power dissipations do non happen. The ac/dc rectifier rectifying tubes operate in discontinuous scope so their shift power dissipations are besides minimized. Thus, high efficiency of the system can be obtained. Due to the fact that all of the parasitic electrical capacities and inductions are included in the resonant or filter circuits, the system does non bring forth parasitic oscillations and is devoid of uncontrolled high electromotive force and current spikes.

The proposed convertor has really attractive characteristics, such as ZCS for all active switches, no rectifying tube change by reversal recovery jobs due to soft commuting of rectifier rectifying tubes, simple topology construction, and convenient control scheme. It seems more attractive in high power applications utilizing MOSFET as chief switches, and high efficiency can be achieved. Experimental consequences confirm the theoretical and simulation analysis.


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