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In order to avoid conventional topology's drawbacks, a new topology that the diode rectifier is replaced by the thyristor rectifier and the control strategy of the active voltage quality regulator with variable dc-bus voltage are proposed in this paper. This paper analyzes the circuit topology and control strategy in detail. Then losses and efficiency of the both circuit topologies are compared in...
To overcome the drawbacks of the conventional gate drive, in this paper a closed-loop gate control method is proposed. In this novel method, the switching speed, specifically di/dt, is measured from the voltage across the parasitic inductance of the IGBT module and a closed-loop control is employed to adaptively adjust the gate drive voltage to control the switching speed according to a preset control...
This paper presents a variable timing controlled soft-switching inverter. The proposed timing control is based on a simple voltage sensing circuit that detects zero voltage crossing condition to determine the main switch turn-on time. The proposed technique can be applied to different types of zero-voltage switching type inverters. In this paper, the coupled-magnetic type soft-switching inverter is...
In this paper, an active gate control method for high power IGBTs in wind power generation system is investigated. With this method, the turn off voltage of the high power IGBTs using Trench-/Field-Stop technology can be clamped at proper level. The implementation of the control strategies is also introduced, which has been used in the practical wind power generation system. It is based on the control...
The present paper proposes an application of the split C-V method to trench gated IGBTs. A model of the gate to emitter capacitance along with an illustration of the monitoring of injected charges in the trench oxide of a trench gated IGBT during an accelerated ageing campaign are presented.
An active fault protection method is proposed to prevent the IGBTs from being damaged should they be under over-current and short circuit fault conditions. A closed-loop gate drive method is used to effectively control the IGBT turn-off switching speed independent of the fault type or resultant over-current level. Compared with conventional solutions, the proposed method can limit fault current level,...
In this paper, the most suitable time to replace to the damaged element in open-loop and closed-loop control for the fault-tolerant induction motor drive system is presented, with a previous stage of fault-diagnostic to detect a short-circuit or open-circuit failure in the power device. The technique is based on the connection of bidirectional switches to isolate electrically the damaged element by...
Hybrid vehicle traction applications require compact power modules with high reliability. A major challenge is the lifetime under thermal cycles. While the requirements are moderate with respect to (active) power cycles, there are challenging requests for a high lifetime under (passive) temperature cycles. Base plates and solder interfaces limit the stability for temperature cycles in the classical...
A dual-interleaved boost converter is presented with zero-voltage switching for applications in electric vehicle power trains. The topology has one input inductor and an interphase transformer (IPT) between the two channels. By using an appropriate differential inductance value for the IPT, the converter achieves transitions with zero-voltage switching in the devices. The circuit operation is described...
High temperature inverter involves thermal management, packaging, semiconductor device, switching circuit, and control circuitry. This paper is to focus on the drivetrain inverter design consideration for electric and hybrid electric vehicles. Basic structure and switching characteristics of different insulated-gate-bipolar-transistors (IGBTs) will be discussed. The use of silicon carbide Schottky...
Several techniques for analyzing and estimating power losses in insulated-gate bipolar transistors (IGBTs), diodes, MOSFETs, and other power electronics switching devices are known. Most of the approaches in the literature deal with periodic pulse width modulation (PWM) switching schemes. This paper presents a simple analysis tool to estimate these losses under aperiodic switching schemes, e.g. hysteresis...
Design consideration of a three-phase inverter with 1200 V Si-IGBT and SiC-JBS hybrid pairs has been implemented to further reduce the power loss and increase the power density. A low-on-voltage SiC-JBS has been developed to reduce the conduction loss. In order to minimize the switching loss of Si-IGBT, a high-speed gate driving technique is introduced. A 4 kVA class three-phase hybrid pair inverter...
Conventional wisdom that the SiC JFET is only a normally on device has recently been superseded by the first practical normally off SiC JFET. This new true enhancement mode, three-terminal, pure-SiC design provides designers with a normally off solution that retains all the benefits of the normally on SiC JFET. With only a simple change in series gate impedance, the EM SiC JFET can be used with common...
The pulse width modulation strategies of Z-source inverter can be classified into two categories according to the two different shoot through state insertion ways. This paper focuses on a loss analysis of Z-source inverter using the both PWM strategies. Based on the semiconductor device loss model, the losses evaluation formula are derived firstly for both cases, then a loss-oriented comparison of...
In order to find the optimal converter topology for a given AC motor drive, as defined by its mission profile, suitable assessment criteria have to be applied. A new semiconductor chip area based approach is proposed to compare and assess different motor drive converter topologies. It determines the total semiconductor chip area based on the drive's operating point and the optimal partitioning of...
In a commutation cell, the implementation of IGBT and MOS requires an insulated signal. Traditionally, the insulated signal is carried out by a DC supply with a high insulation transformer for energy transmission and an optical fiber or pulse transformer for the switch control information. A new approach seems promising: the switch control information by a wireless transmission. Analog or digital...
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