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The near magnetic field radiations from power electronics systems are very important as they generate EMI and degrade EMI filter's performance. This paper discussed the near magnetic field radiation behavior of magnetic components including differential mode (DM) and common mode (CM) inductors. The sources and the main radiation mechanism are identified for different inductor structures with either...
Both high switching frequency and high efficiency are critical in reducing power adapter size. The active clamp flyback (ACF) topology allows zero voltage soft switching under all line and load conditions, eliminating all leakage inductance and snubber losses. Using enhanced mode GaN switches, an optimized active clamp flyback can enable 5–10x higher switching frequency, while improving efficiency...
This work presents a small form factor, 12 V to 3.7 V resonant switched-capacitor (ReSC) converter IC with feedback regulation and autotuned zero current switching. The converter uses a modified series-parallel architecture to operate with single-voltage rated devices without degrading the net V-A product. Quasi-resonant operation is used to operate with conversion ratios below the nominal 3:1 level...
This paper proposed a new topology that can achieve high-step-down conversion compared with traditional buck converter. A coupled inductor is employed to extend duty cycle which is for high-step-down applications. Soft-switching of all switches can be achieved. A prototype with 24 V input 5 V/2 A output is given to verify the circuit operation. Switching frequency is up to 1.3 MHz to minimize magnetics...
In this work, a new set-up is presented to characterize the large signal electrical parameters of on-Silicon integrated coupled inductors for Power Supply on Chip. The proposed system is suitable to perform the measurements under different large-signal test conditions given by the dc bias current up to 2 A and ac current through one or both windings, with amplitudes ranging from 0 A to 0.5 A at frequencies...
In high voltage direct current (HVDC) converters, a series connection of semiconductor devices is often used to achieve the desired blocking voltage. In such configuration, an unequal voltage sharing may drive one or more devices into avalanche breakdown, eventually causing the failure of the entire group of devices. This paper presents the experimental evaluation of SiC MOSFETs from different manufacturers...
For the first time we report on detailed, quantitative reliability measurements and accelerated life data for > 1,300 of 900V, 10mOhm, 32mm2 SiC MOSFETs being developed for automotive and industrial applications. SiC MOSFETs were characterized and subjected to High-Temperature Reverse Bias (HTRB), High-Temperature Gate Bias (HTGB), Thermal Shock, and High-Humidity High-Temperature Reverse Bias...
The high power density converter is required due to the strict demands of volume and weight in more electric aircraft, which makes SiC extremely attractive for this application. In this work, a prototype of 50 kW SiC high power density converter with the topology of two-level three-phase voltage source inverter is demonstrated. A gate assisted circuit is further introduced to reduce the switching...
The reliability of the MOSFET is a concern as it has been extensively used for the critical power supply applications in hybrid electric vehicles, high-speed electric trains, and electric aircraft. The MOSFET is subject to the multiple electro-mechanical stresses simultaneously during its operation. The degradation in MOSFET is random in nature due to these stresses along with manufacturing imperfection...
Turn-off delay time is temperature sensitive and can be used to estimate the junction temperature of insulated-gate bipolar transistors (IGBTs). In this paper, a high-resolution measurement circuit is designed to detect the turn-off delay time and estimate the corresponding junction temperature. Details of the circuit are demonstrated. Turn-off delay time at different junction temperature, different...
In this paper, the lifetime prediction of power device modules based on the linear damage accumulation in conjunction with real mission profile assessment is studied. Four tests are performed under two superimposed power cycling conditions using an advanced power cycling test setup with 600 V, 30 A, 3-phase molded IGBT modules. The superimposed power cycling conditions are made based on a new lifetime...
This paper shows a combinational decoupling method to minimize dc-bus capacitance and improve power density for DC to AC applications, especially for single-phase inverters. The proposed method is combined with in-series structure and in-parallel structure together with power equations analyzed. The detailed control strategy is given. The simulations are conducted via PLECS software to prove the theoretical...
Adaptive on-time (AOT) hysteretic control has gained increasing popularity in automotive electronics, because of its superior line regulation and fast load transient response. However, it faces serious switching frequency deviation and soft start issues from the conventional implementations. To mitigate these, this paper proposes a clock-synchronized AOT hysteretic control which adaptively synchronizes...
In traditional battery systems, a large number of battery cells are usually connected in series and parallel with a fixed topology during operation to supply the desired voltage and current. However, this fixed configuration has low reliability, low fault tolerance, and voltage imbalance issue. This paper proposes a new modular and reconfigurable battery pack (MRBP) consisting of reconfigurable battery...
DC power distribution systems for data centers, industrial applications and residential areas are expected to provide higher efficiency, reliability and lower cost compared to ac systems. Accordingly they have been an important research topic in recent years. In these applications an efficient power factor correction rectifier, supplying a dc distribution bus from the conventional three-phase ac mains...
This paper proposes a new high gain soft switching dc-dc topology based on switched inductor boost converter (SIBC). SIBC itself as a high gain boost topology has the issue of high conduction loss in switching diodes and high switching loss in the main switches. Also, it has severe EMI issue due to the diode path between input and switching node. The new topology is derived aiming at zero voltage...
This paper presents a general methodology to generate multiple outputs for different switched-capacitor DC-DC converters. By enabling the sharing of power switches and capacitors among outputs and the power-switch current-stress minimization, the required number and size of power switches and capacitors are minimized to optimize the area efficiency of the power converter. Experimental results demonstrate...
A novel dual-input dual-buck inverter (DIDBI) is presented to interface a low voltage DC source, a high voltage DC source and an AC load simultaneously. The presented DIDBI allows a low voltage DC source, e.g. low voltage bus, battery and renewable source, to supply power to the AC load directly, even though the voltage of the low voltage DC source is lower than the peak amplitude of the output AC...
A high efficiency and high power density sigma converter for 48/1V voltage regulator module (VRM) is proposed in this paper. The Sigma converter is a quasi-parallel converter that uses a high efficiency unregulated converter to deliver most power to the load with small power flowing through buck converter responsible for regulating the output voltage. The unregulated isolated converter is LLC converter...
This paper proposes a modified coupled-inductor SEPIC dc-dc converter for low power and high voltage gain applications such as for piezoelectric drive systems. The converter uses the same components as of SEPIC converter with an additional diode. Compared to conventional topologies with similar voltage gain expression, the proposed topology uses less components to achieve same or even higher voltage...
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