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Switch fault diagnosis is an important design criterion for dc-dc converters, as it can improve system reliability, prevent converter damage, and production losses to end users. This paper proposes a short circuit fault (SCF) diagnosis method for interleaved dc-dc converters that can detect the fault and identify the faulty switch in less than one switching cycle. The dc-link current is utilized as...
DC-to-DC power supplies for CPUs or GPUs are critical components on the motherboard of modern computer systems. Converting an intermediate bus voltage (e.g. 12 V) to the core voltage (∼0.9 V) of CPUs or GPUs must be efficient, compact and cost effective. This paper proposes an active-clamp forward converter (ACFC) power block to supply core voltage on a motherboard. The ACFC power block can be individually...
This paper presents a DC/DC buck-boost converter topology with high voltage gain and dual outputs. Unlike many of the high step-down / step-up DC/DC converters, this topology uses relatively less number of LC components and three active semiconductor devices, switched in a non-overlapping way. In the proposed converter, the overall gains at both the output ports are non-linear functions of duty-cycles...
This paper presents a DC-DC step-down power conversion architecture that allows a power cable, such as USB cable, to deliver both power transmission and power conversion functions. In this architecture, an S-Hybrid converter topology is proposed to utilize parasitic inductance readily available in the cable for power conversion stage. As a result, the explicit inductor often required in a buck converter...
A time-length compensation algorithm to eliminate sub-harmonic oscillation is proposed in primary-side regulation flyback converter with average current control method to realize constant output current. A matrix analysis method is put forward to analyze the sub-harmonic oscillation in CCM mode. Based on the above analysis, a simple time-length compensation algorithm is added to eliminate sub-harmonic...
This paper presents the design optimization and experimental results for a 150-kHz, high-power, non-isolated, bidirectional buck-boost converter operated in continuous-conduction mode (CCM) and implemented with SiC MOSFETs. Although the SiC MOSFETs exhibit a much better reverse-recovery characteristic than their Si counterparts, their efficiency at high-frequencies can be significantly improved by...
A precise overload protection is able to improve the thermal design of power supply systems. However, as for LLC resonant off-line converters, there are not many studies about how to detect the load conditions at the primary side of the converters which is important to realize the precise overload protection. In this paper, we implement a lossless and precise load detection technique by a novel average...
Wide bandgap (WBG) semiconductor devices allow power electronic converters to achieve higher efficiency, higher power density and potentially higher reliability. However, the design challenges accompanied by applying the new WBG devices have risen accordingly. In this paper, a non-isolated bidirectional DC-DC converter equipped with Gallium Nitride (GaN) semiconductor transistors is presented. The...
This paper presents the in-depth design of an isolated dc-dc power converter for aerospace applications rated at 30 W, dual 15 V dc outputs, 10–80 V input, switching at 1 MHz and using enhancement-mode GaN power transistors. A recently proposed three-switch active-clamp flyback topology is chosen as an effective means to deal with the large input voltage variation, and meet the high efficiency target...
A bidirectional buck-boost converter with a new soft-switching active-snubber cell that reduces switching losses is introduced. Soft-switching cell consists of an active snubber switch, a snubber inductor, and a two-winding transformer with associated magnetizing current reset circuit. The soft-switching cells enable the buck and boost rectifier to turn off with a controlled turn-off rate of their...
This paper reveals how the conducted common mode noise of a boost converter can be reduced by the use of leakage inductance of coupled inductor. Specifically, it shows how the common mode impedance due to the leakage inductance of a coupled inductor can be used to reduce common mode current, and this point is experimentally verified using two kinds of inductors: a gapped core inductor with a higher...
A voltage doubler circuit is realized to extend the soft-switching range of Dual Active Bridge (DAB) converters. No extra hardware is added to the DAB to form this circuit, since it is composed of the dc blocking capacitor and the low side full bridge converter, which already exist in DAB. With the voltage doubler, the DAB converter can achieve soft switching and high efficiency when the low side...
The capacitor current would be imbalanced under the conventional control strategy in the half-bridge three-level (HBTL) DC/DC converter due to the effect of the output inductance of the power supply and the input line inductance, which would affect the converter's reliability. This paper proposes a pulse-wide modulation (PWM) strategy composed of two operation modes for the HBTL DC/DC converter, which...
Growth of electricity consumption for data center increases rapidly as computation continues to move into the cloud computing. Energy management has become a key issue for the next generation of data center. 48V to 12V step-down isolated converters are often required in server, telecom and automotive applications. Using resonant topology such as LLC realizes ZVS turn-on for all switches over the entire...
The aim of this work is to present a novel topology of a three-phase LLC converter with integrated magnetics. The converter operation and the comprehensive theoretical analysis are presented; this analysis follows the first harmonic approximation (FHA) approach to simplify the system model. Usually, LLC converter achieves zero voltage switching (ZVS) as long as it working in the inductive region....
Recently, because of the pollution problems of the fossil fuels, demand of renewable energy sources is increased. Solar panels and fuel-cells generate low voltage, therefore high voltage gain dc-dc converters are needed to boost their low output voltage to meet the inverters required voltage. Z-source converter has several advantages such as high voltage gain, isolated energy source from the load...
In this paper, a cascaded multi-stage non-isolated high voltage conversion ratio (VCR) bidirectional DC/DC converter is proposed. The VCR is n times of the conventional buck/boost converter with only n+2 switches. All the switches can achieve full range ZVS whether in the buck or boost mode. The low voltage side current ripple can be reduced with two-phase interleaved structure, which is suitable...
This paper proposes a dual-bridge based LC series resonant dc-dc converter. The input inverter unit incorporates two bridge structures, i.e., a full-bridge inverter and a half-bridge inverter. For the output rectifier, it can be a full-bridge rectifier or an asymmetric half-bridge rectifier. Different from the conventional resonant converter, a fixed-frequency PWM control is employed which makes the...
The LLC resonant power supply topology shows great promise for meeting the demands of increased power density while maintaining high efficiency. But there is a tradeoff between maximizing efficiency and accommodating regulation over a wide input voltage range. The most efficient designs have narrow input voltage range, therefore requiring a large DC bus capacitor to support the required holdup time,...
With the increasing power demand of automotive systems, a 42V power system has the trend to coexist with the traditional 14V system in order to decrease the system current stress. In the dual-voltage and dual-battery architecture, a compact, high efficient and bidirectional DC/DC converter is typically needed. In this paper, a hybrid bidirectional DC-DC converter for 42/14V dual-voltage automotive...
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