Abstract
The manuscript proposes a quadratic gain bidirectional converter (QGBC). The proposed converter is operated in two different stages—step-up (motoring) and step-down (regenerative braking)—which can be employed in electric vehicle (EV) applications. The converter is operated in the continuous inductor current mode (CICM). For regenerative braking (RB) of permanent magnet brushless DC (PMBLDC) motor, the self-inductance of the motor is exploiting to step up the back electromagnetic force (EMF) of the motor to extract the energy even at low rotor speed. The design parameters of the converter are selected as battery voltage V s = 48 V , output voltage V o = 200 V , output power P o = 1 kW , and switching frequency f s = 20 kHz . The design system is simulated using MATLAB/Simulink. Finally, a 1 kW prototype is developed for validation and performance analysis of the converter. The converter operates at maximum efficiency of 95% during step-up operation of the converter. A DSP microcontroller TMS320F28335 is used to control the switches of the converter in the experimental setup.
Highlights
A high gain bidirectional DC-DC converters (BDCs) is proposed in [1, 2]. e high gain BDCs are used in electric vehicles (EVs) as they convert low voltage to high voltage and recovery of energy during regenerative braking (RB) which will enhance the driving range of the vehicle
To get higher voltage gain without wider duty cycle operation, a voltage multiplier circuit (VMC) [16] is proposed. e number of diodes required for 2N − 1 combinations for N diode-capacitor VMC and N fold of voltage gain are described in details
The phase-shift control technique is used, and soft switching is applied for minimum switching loss. ere are different topologies of quadratic voltage gain converter proposed in [21, 22]. is quadratic converter has a ripple current on the low voltage side which affects the performance of the battery/supercapacitor
Summary
In this converter, only three switches are used for bidirectional buck-boost operation with dual input and dual output ports, but the voltage gain is same as the conventional boost converter. Ere are different resonant converters used for wide voltage gain and higher efficiency [19, 20] In this fixed frequency, the phase-shift control technique is used, and soft switching is applied for minimum switching loss. E proposed converter has the following advantages: high voltage gain at a low duty cycle, fewer power switches, a simple construction, and easy control. E load on the converter consists of VSI fed PMBLDC Motor with a pulley and belt in the converter’s step-up operation.
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