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Advanced IGBTs need to be shut off when a short circuit occurs within less than 0.5μs as the current density of IGBTs increases. In this paper, a circuit design and the measurement results are described for an IC chip which enables the short-circuit detection within 20-ns. The circuit detects the short-circuit condition by checking the existence of a plateau in a gate drive waveform. The proposed...
Induction welding and high frequency hardening are the two most straightforward applications in induction heating for the power inverter. Practical industrial welders require at the same time power levels up to 1 MW while frequencies are in the range between 200–500 kHz, depending on the characteristics of the tube to be weld, while hardening power supplies require power levels up to 400 kW with frequencies...
This paper proposes a new power device combination that can reduce total power loss for a single-phase inverter reduced common-mode noise. In the proposed common mode voltage reduction PWM, to reduce the common-mode voltage of a single-phase inverter, the half bridge connected to the live end of the single-phase commetial power source perform PWM, and the other half bridge connected to the neutral...
Along with the further study of multi-terminal VSC-HVDC and HVDC Grid, as the key equipment, high voltage dc circuit breaker (DCCB) received great attention. Firstly, based on the comparison of the existing circuit breaker, a new topology for current-limiting HVDC circuit breaker was proposed in this paper. Secondly, the working principle of this breaker is analyzed. This topology allowing IGBT (insulation...
Inductive Power Transfer (IPT) is the most available method to transfer the power wireless by loose coupling. Various IPT systems for electric vehicles are either under development or deployed as aftermarket options in the automotive industry. In this work, a series-series compensated inductive power transfer system for electric vehicles is presented and investigated, which allows a power transmission...
Traction drives frequently operate at large torque and low speed states, which results in large junction temperature fluctuations and high peak value of inverter power devices. Therefore, the reliability of IGBTs will decrease significantly without suitable thermal control. In order to reduce power losses and junction temperature in low speed operation, the main studies of this paper are as follows:...
This paper proposes an online dynamic electro-thermal model to compute the junction temperature of an IGBT under real time operating conditions. The proposed computational model is based on transient thermal capacitance and power loss calculations. Insulated Gate Bipolar Junction Transistor is popularly used in mission safety critical applications such as aerospace. Usually mission critical application...
In order to develop power electronic systems with high power densities the performance of the cooling system has to be increased. Thereby, the thermal resistance of power semiconductor modules is an important design aspect. However, the thermal resistance of modules is influenced by cross-coupling effects which are dependent on the module layout and the heatsink. These cross-coupling effects are not...
This paper proposes a new design procedure for a bidirectional LCL DC-DC converter. This converter employs two DC/AC insulated-gate bipolar transistor-based (IGBT) converters and a passive LCL filter instead of a typical high frequency transformer. The presented LCL filter design is based on zero reactive power. Higher step ratio is achieved by utilizing post-resonant mode of operation. The proposed...
This paper presents a power-hardware-in-the-loop (PHiL) grid emulator (GE) which is based on switch-mode voltage source inverters (VSI) with the magnetic coupling. The grid emulator is controlled to reproduce the typical grid fault behaviors (under-voltage, interruption, frequency variation, fault-ride-through etc.) for the equipment under test (EUT). In past several different commercial grid emulators...
This paper introduces a simplified method for estimating switching energy losses in an IGBT device of a Voltage Source Converter (VSC) using Electro-Magnetic Transient (EMT) simulations. By considering the switching process as characterized by an equivalent circuit model of a unit cell that represents one leg of a VSC, equations are derived to evaluate the switching losses at different load currents...
Increasing the channel width of an IGBT is an obvious method in order to decrease the on-state losses significantly due to the lower Vce,sat-value. The accordingly higher desaturation current leads to the development of faster short circuit detection methods, such as the new 2D — short circuit detection method, which is able to detect a fault event far ahead of the desaturation process of the power...
In order to avoid a bridge shoot-through, a simultaneous on-state of both IGBTs in a bridge leg is strictly forbidden. Therefore, the complementary switch is commonly turned on with a dead-time interval to ensure a complete turn-off the other IGBT. Due to the longer tail-current interval of IGBT switching process, for the purpose of absolute safe operation, the interlocking time to is empirically...
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