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DC-link capacitors are usually utilized in voltage source converters to stabilize the DC-link voltage and suppress the transmission of current harmonics into the power grid. To guarantee the reliability of voltage source converters, in addition to select the DC-link capacitors with optimum capacitance, appropriate rated voltage and enough ripple current capacity, thermal design is also of great importance...
Inherent high switching frequency ability makes silicon carbide Metal-Oxide-Semiconductor Field-Effect transistor more sensitive to the parasitics and noise in the circuit. The layout of gate driver has a crucial influence on the parasitics, hereby the propagation delay and rise/fall time of the driving signal which is among the dominant factors to determine the switching performance of power device...
An electromagnetic interference (EMI) filter design method for electric vehicle (EV) application is proposed in this paper. By transforming the design problem to an optimization problem, the filter volume, system disturbance level, inverter touch current and filter leakage current are taken into account simultaneously. A topology and order evolution approach is merged into the optimization algorithm...
Silicon carbide (SiC) devices have its unique advantages of high operating temperature, high voltage capability with low switching losses when compared to its silicon counterparts. This paper presents a systematic method for long-term reliability analysis for SiC devices. The reliability block diagrams (RBDs) have been established for a SiC power module with standard wire-bonded package. The reliability...
In this paper, a genetic algorithm based converter system design procedure is presented with the feature of speed and universal. This method can better pack a high power density power converter.
In the power electronic device and the electronic equipment installed in electric vehicles (EV), the flyback converter is most commonly used as the auxiliary power supply. The electromagnetic interference (EMI) emitted by a flyback converter can transmit directly through the power supply port to other power electronic devices powered by the same power supply system. In this paper, the mechanism of...
In this paper, compact power module design and evaluation method is presented for EV application. This method can help to design a high power density power converter.
The thermal finite element model of the power module based on the actual physical conditions is not easy to be consistent with the experimental results, limited by the accuracy of the input conditions. In this paper, a method of calibrating the transient thermal finite element model using the measured thermal structural function is proposed and practiced. The structural functions derived from the...
The main function of the DC-link decoupling capacitors, integrated between the voltage source and the power devices, is to suppress the effect of the parasitic inductors and minimize the voltage overshoot. Besides, decoupling capacitors can also affect the electromagnetic interference frequency spectra. In this paper, the elïects of decoupling capacitors are explained from the time-domain and the...
The parasitic parameters in the power module have a negative effect on switching losses and dynamic characteristics. With the rapid development of integrated circuit technology, the high current, high frequency and high pressure working environment put forward higher requirements for the switching circuit delay, reliability and power consumption. The rational layout of the power module is the key...
In the power electronic device and the electronic equipment installed in electric vehicles (EV), the flyback converter is most commonly used as the auxiliary power supply. The electromagnetic interference (EMI) emitted by a flyback converter can transmit directly through the power supply port to other power electronic devices powered by the same power supply system. In this paper, the mechanism of...
Compared with the silicon semiconductors, silicon carbide (SiC) metal-oxide-semiconductor Field-Efïect transistor (MOSFET) can operate at higher switching frequency and higher temperature, which makes the junction temperature estimation more significant and challenging. In this paper, different thermo- sensitive electrical parameters (TSEPs) are investigated about their potential to measure the junction...
This paper presents a novel die attach material that withstands high working temperature of at least 415 °C after low temperature liquid bonding at 250 °C. The die attach material was preform compressed with Cu@Sn core-shell microparticles, which were produced using an electroless process. When the reflow temperature reached Sn melting point, the outer Sn layer melted and connected the inner Cu cores...
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...
Improved from the conventional analytical thermal model, a fast compact model based on finite differential method wtih PSPICE is presented in this paper. The paper presents the physical basis and the practical consideration. Based on the model, a cooling system example was introduced and verified for high power density converter systems design.
Insulated gate bipolar transistors (IGBTs) are the critical components for electrical vehicle inverter. This paper introduced a general approach of lifetime evaluation of IGBT modules for electric vehicles mission-profile. A general evaluation procedure were provided and discussed. The driving cycle FTP-75 was used as an input to the lifetime evaluation procedure. The lifetime of IGBT modules in electrical...
The layout of power modules is one of the key points in power module design. In this paper, along with design examples, an improved automatic layout method for planar power module is presented. Some practical considerations and implementations are introduced in the optimization procedure.
The rotor shape of external rotor surface permanent-magnet machine (SPM) substantially affects the induced voltage, the iron losses and the torque ripple, which are importance machine performances. This paper proposes a rotor design method to optimize these motor performances, by using rectangular magnet without complex shape. According to the rectangular magnet, a non-uniform air gap is obtained,...
The layout of power modules is one of the key points in power module design, especially for high power densities, where couplings are increased. In this paper, along with the design example, a fast and universal layout design method for both wirebond and planar power modules is presented. Some practical considerations and implementations are introduced in the optimization of module layout design.
This paper presents an analytical approach for evaluating the magnet eddy-current losses of interior permanent-magnet synchronous machines (IPMSMs) during flux weakening. To investigate the magnet eddy-current losses, an analytical method of the time-varying magnetic flux density in the magnet is proposed based on the armature reaction magnetic field analysis. According to the time-varying magnetic...
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