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In this paper, the optimisation possibilities of a quasi-resonant induction cooker are investigated. Simulations show that main losses of the induction cooker occur in the heating coil and the RC-IGBT (power switch). The performance of the coil can be improved mainly by minimising the coil resistance. The IGBT-optimisation is based on the reduction of tail current in soft switching mode. The tail...
Further automotive efficiency improvements require higher voltage levels than 14 V for electric energy generation and distribution. As long as not all electric consumers can be adapted to the higher voltage level, DC/DC-converters link automotive power nets with different voltages. For low voltage converters without galvanic isolation mostly multiphase DC/DC-converters with coupled or uncoupled inductors...
Time domain technique is used to analyze the LCC converter with capacitive output filter. The converter was operated with frequency control above resonance under heavy load conditions. The analysis is validated with PSPICE simulation and results from an experimental prototype.
This paper presents a voltage balancing method for a four-level hybrid-clamped inverter. The relationship between the capacitor currents and switching functions is studied. A modified phase-shifted PWM method is used to regulate the capacitor currents by adjusting the start and end time of the PWM signals slightly according to the capacitor voltages and the polarity of the output current. Experimental...
This paper describes evaluation of IGBT partial turn-off behavior by 3 types of circuit topologies, hard switching (SW) type, Zero Voltage Switching (ZVS) type and Tail Loss Cancel (TLC) method. Partial turn-off method by ZVS without over elimination in proposed Snubber Assisted Zero voltage and Zero current transition (SAZZ) topology obtained highest efficiency of 97.42 % at 30 kW, 1.82 % higher...
The series connection of IGBTs is necessary when the blocking voltage requirements are higher than the rated voltage of commercially available IGBTs. However, voltage unbalances caused by different switching behaviors during the turn off process of series connected IGBTs could lead to the failure of one IGBT if it exceeds its maximum blocking voltage. This paper demonstrates that the proper operation...
This paper investigates the parasitic turn on during the reverse recovery of the body diode of the normally on 1200 V SiC JFET. During the reverse recovery flows a hole current through the space charge region. The hole current is increasing the charge in the space charge region and the gradient of electrical field increases. A higher gradient of electrical field with the same switching speed causes...
The low switching losses of the Silicon Carbide (SiC) components enable power converter to operate at higher switching frequencies and higher junction temperature. Operating at high switching frequencies enables to reduce volume and weight of passive component. Operating at high junction temperature helps to reduce size and weight of the cooling system or even enables the use of a natural cooling...
This paper deals with a transformer-less Variable Speed Drive based on High Power Medium Voltage PWM Voltage Source Converters connected to a distribution network without transformer. This technology represents the new generation of high efficient and compact power conversion solution. The transformer-less “architecture” of this variable speed drive was proposed thanks to a global system study combining...
Power storage system using battery and super-capacitor are more and more popular in renewable energy, smart grid and electrical vehicles. But the voltage and current of the basic battery cells and super-capacitor are limited. So in practical applications, a large number of cells are connected in seriously or parallel to improve the output voltage and current ability. Due to the differences between...
The harmonic elimination problem for the PWM is formulated as a set of transcendental equations, and a conventional solution to this problem needs iterative computation. This paper presents a noniterative algorithm based on a trigonometric harmonic cancellation rule among pulses. The effectiveness of the algorithm was confirmed by simulations and experiments.
The high cost of Electric Vehicles (EVs), their low driving range and their long charge time limit the automotive market share. In this paper, a new concept of slow/fast low-cost on-board battery charger for EV or plug-in hybrid EV, developed by Valeo, is presented. The major innovation is that a same converter device operates in the charger and traction modes. In charger mode, the electric machine...
This work presents a new multilevel unidirectional single-phase PFC rectifier topology well-suited for applications targeting for high efficiency and/or high power density. The characteristics of this rectifier topology, including the principles of operation, modulation strategy, feedback control scheme, and dimensioning equations are described in this paper. Finally, a 3 kW laboratory prototype is...
This paper presents new three-phase high power factor ac grid interface circuits appropriate for future bipolar dc active distribution networks. The ac-to-dc power converter concept is constructed by combining a six-switch buck-type PFC converter and a bipolar dc-dc boost-type inverting-link circuit. The characteristics of this concept, including an appropriate modulation and control structure, are...
Active Voltage Control (AVC) is an implementation of classic Proportional-Derivative (PD) control and multi-loop feedback control to force an IGBT to follow a pre-set switching trajectory. Previously, AVC was mainly used for controlling series-connected IGBTs in order to enable voltage balance between IGBTs. In this paper, the nonlinear IGBT turn-off transient is further discussed and the turnoff...
The dynamic IGBT model is characterized with a circuit simulator characterization tool by utilizing datasheet information and after that the model is tuned by using data from experimental measurements. The circuit simulator simulation results from both models are compared with the experimental results and the possible accuracy improvements are reported. The main research question of this work is how...
Nowadays the field-stop (FS) IGBT provides lower saturation voltage drop and lower switching losses than the conventional non-punch-through (NPT) IGBT, making the FS IGBT well suited for induction heating (IH) applications. A relatively recent improvement in the FS IGBT — the integration of an antiparallel diode on the IGBT die through use of the shorted-anode (SA) technology — made the FS IGBT even...
This paper presents a test circuit and methodology suitable for testing high-power half-bridge submodules such as would be used in cascaded converters for high-voltage dc converters. The circuit utilizes a series resonant tank and two half-bridge submodules with voltage and impedance cancellation in order to minimize hardware requirements.
Toward the aim of advanced integration in power electronic, the properties of Multicell interleaved converters are of prime interest. Among these properties, the EMC behavior is interesting and the dynamic performances are excellent. However their implementation requires the monitoring and balancing of intercell currents. On one hand, the converter control must ensure a satisfying balanced distribution...
The Charge Extraction Model is a high voltage IGBT model for the turn-off behaviour under extreme switching conditions to evaluate different gate driving circuits. This model is a physical founded IGBT model and considers the carrier distribution and the current profiles during the switching-off in one dimension through the device. It can be used for circuit simulations and shows some advantages in...
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