Analysis of a 4-phase tapped-inductor DC-DC converter for high boost ratio wide input voltage range applications

Abstract

Detailed analysis of a 4-phase tapped-inductor boost DC-DC converter operating in continuous conduction mode is presented.Expressions needed to evaluate converter performance are derived. These are then used to plot input-and output-side current ripple characteristics. It is shown that inputand output-side ripple vary in proportion and the converter operates with low ripple over certain ranges of duty ratio. The performance of a 1-phase converter is seen to represent the worst-case scenario for 3-and 4-phase converters. For a given per-unit load and type of snubber, 1-and 4-phase converter efficiencies are identical. Converter is suitable for applications with wide input voltage range, requiring low input-and outputside ripple, high efficiency and boost ratios. Theoretically derived characteristics are validated through simulations and there is good agreement between analytical and simulation results.

High boost‐ratio bidirectional converter for interfacing low‐voltage battery energy storage system to a DC bus

“…The terminal voltages of the RES feeding the DC microgrids are, however, much lower than these DC-bus voltages, necessitating the use of high boost-ratio DC-DC converters (HBRCs) to interface these sources to the DC bus [4-8, 10-12, 15]. The HBRCs employed in these applications can be categorised into those with galvanic isolation [8,[14][15][16][17] and those without [4][5][6][7][8][9][10][11][12][13][14][15][18][19][20][21][22][23][24][25][26]. Galvanic isolation can be provided using either transformers or coupled inductors [14][15][16][17].…”

“…However, they suffer from the high switch and diode voltage stress [6]. Interleaved CIBCs have input-side always parallel connected to share input current, thus reducing conduction and switching losses and also increasing power handling capability [4][5][6]15]. In cascade CIBCs, the output-side part of the circuit is also parallel connected [6,13,15] lowering output current and voltage ripple.…”

“…A novel bidirectional passive lossless snubber circuit to clamp the voltage spikes without affecting normal operation is thus proposed. For operation with low input and output ripple allowing significant filter capacitor reduction, input current sharing for higher power ratings and efficiency, low input voltage and hence switch voltage stress the structure for the interface is modular [4][5][6][7]. Through careful selection of the tapped-inductor windings turns-ratio and duty-cycle, the necessary boost-and buck-ratio and further reductions in the size of components can be achieved while keeping the device blocking voltages within acceptable limits.…”

“…high input voltage) means higher switch stress and vice-versa. From[4,5], a high duty-ratio equates to high ripple operation.BTIBC performance is evaluated based on the above design considerations, by designing and simulating a two-phase converter with the following specifications:Vbat = 60 V (during charging) and 48 V (during discharging); V bus = 380 V, P o = 1 kW, f sw = 100 kHz, output voltage ripple is 2% of the capacitor voltage, coupling coefficient, k = 0.99, turns-ratio, n = 6, duty-cycle, D 1 = 0.53 (in buck-mode operation) and D 2 = 0.5 (in boost-mode operation), L 1N = 2.97 mH, L 2N = 84.8 µH, C o = 2.5 µF, r L1N = 0.75 Ω, r L2N = 0.028 Ω, and r ds,on = 0.032 Ω.…”

Investigation of Four Phase Interleaved Boost Converter Under Open Loop and Closed Loop Control Schemes for Battery Charging Applications

“…In conventional boost converter, the magnitude of ripple in the output voltage is high which is not desirable for battery charging applications. By the concept of interleaving, the output voltage ripple along with input current ripple is reduced to a value depending upon the duty cycle of operation [3]. For example, in two phase operation of boost converter, minimum ripple is obtained at 50% duty cycle and in three phase operation at 33% and 66% [4].…”