A POWER QUALITY IMPROVE EV CHANGE WITH BRIDGELESS LUO CONVERTER
ABSTARCT : An high non-linear diode bridge rectifier has been used in the electric vehicle charger for the use of DC voltage at only the DC-DC converter input but also to implement significant power quality problems only at existing AC input.
By eliminating their input bridges, such problems developed a tremendous a need boost the Performance of power quality of developed battery chargers. Also in proposed method, these are accomplished by a inclusion of even a advanced Power Quality bridgeless LUO converter.
This current PFC converter indeed a addition made by two LUO converters with such a standard inductor, operating independently and over corresponding half-cycles. A converter offers a high power density and low cost based EV charging strategy with higher precision operating in only a single switching cycle because of the absence of an input diode bridge from conventional PFC converters. The input current in a charger becomes rendered and it makes its source voltage, accurately on step, but it reaches the high input power factor.
The problem of high switch voltage stress remains in these converters, which, in turn, lowers the converter efficiency.
Therefore, a modified isolated LUO converter fed single stage EV charger in DCM, is designed and implemented in this work, to charge a 48V, 100Ah EV battery in constant current and constant voltage (CC-CV) mode.
The significant contribution of proposed work is seen with remarkably reduced voltage stress across the PFC switches, which is obtained with certain modification made in the base isolated LUO structure.
The proposed LUO converter is modified version of basic isolated LUO converter with one additional switch and two clamping diodes.
Assuming that both transformers of the two structures have the same cost, namely the total transmitted power, copper amount and iron core specifications are the same. Usually a transformer’s power loss consists of load loss and no-load loss.
the power losses are identical in the two transformers due to their same settings. As for the secondary side, it is difficult to compare their power losses directly. Thus, it is necessary to analyze their load losses and no load losses in detail.
The proposed method is implemented to overcome the power quality issues by selective harmonic distortionsof 3rd and 5th order.
The converter design is based on LUO power factor correction controller.
PID control logic is applied through the PIC controller.
To compare the efficiency of the two kinds of structure fairly, the power losses in both transformers and power
converters are considered in the following evaluation model.
The main objective of this project is to design bridgeless AC-DC converter for electric vehicle charger.
To improve the power quality & THD a closed loop control system is implemented.
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