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Power Electronics Specialists Conference, 1998. PESC 98 Record. 29th Annual IEEE

Date 22-22 May 1998

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  • 29th Annual IEEE Power Electronics Specialists Conference [front matter]

    Publication Year: 1998 , Page(s): i - ii
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    Freely Available from IEEE
  • Table of contents

    Publication Year: 1998 , Page(s): x - xxxi
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  • Gate-drain capacitance behaviour of the DMOS power transistor under high current flow

    Publication Year: 1998 , Page(s): 1716 - 1719 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (274 KB)  

    The gate-drain capacitance of a power DMOS transistor was measured under high current conditions of up to 250 A. Depending on V/sub GS/ a strong nonlinear characteristic was observed. Using the measured capacitance data the characteristics of the inner MOS transistor and the epi region have been determined separately for parameterisation and modelling. View full abstract»

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  • Author's index

    Publication Year: 1998 , Page(s): 2137 - 2141
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    Freely Available from IEEE
  • A novel full-bridge zero-voltage-transition PWM DC/DC converter with zero-voltage/zero-current switching of the auxiliary switches

    Publication Year: 1998 , Page(s): 961 - 966 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (468 KB)  

    In this paper, a novel full-bridge (FB) zero-voltage-transition (ZVT) PWM DC/DC converter topology is proposed. The proposed FB-ZVT PWM DC/DC converter has ZVS of main switches for wide load and line ranges and an advantage of achieving zero voltage and zero current switching of the auxiliary switches using the auxiliary network. The auxiliary network is simply composed of saturable inductor, auxiliary capacitors and auxiliary diodes. With the help of the proposed auxiliary network, the improved FB-ZVT PWM DC/DC converter has so much improved characteristics with respect to the overall system efficiency. The operation principles are explained in detail and the several interesting simulation and experimental results verify the validity of the proposed circuit from a 83 kHz, 1 kW prototype converter using IGBTs View full abstract»

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  • A highly efficient buck converter with double-anti-crossover synchronous rectification using a newly developed control IC

    Publication Year: 1998 , Page(s): 1243 - 1247 vol.2
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    A highly efficient buck power converter is described that uses a newly developed control IC. The control IC has a new gate driving scheme that utilizes double-anti-crossover control for synchronous rectification. It reduces loss in power MOSFETs by restraining pass-through current. A maximum efficiency of 93% is obtained in the buck power converter, whose output voltage is 3.3 volts View full abstract»

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  • Zero-voltage-transition topologies for Cuk converters

    Publication Year: 1998 , Page(s): 930 - 935 vol.2
    Cited by:  Papers (3)
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    With continuous input and output current, wide output voltage range and small output filter, Cuk topology has gathered more and more attention. Soft switching is especially important to a Cuk converter because the power handling capability requirements of semiconductor devices are higher than those of other topologies. Several kinds of zero-voltage-transition (ZVT) topologies newly proposed can be applied to Cuk converters to achieve soft switching. These ZVT topologies combine both merits of conventional PWM converters and resonant converters. The power switches in the ZVT topologies commutate under zero-voltage-switching by aid of resonant snubber cells during short ZVT time. Circuit operations are identical to common PWM topologies during test time. Four classes of ZVT topologies for Cuk converters with power MOSFETs employed as power switches are discussed in this paper. Qualitative descriptions and experimental results are presented to illustrate each class of ZVT topology View full abstract»

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  • Noise characteristics of piezoelectric-transformer DC-DC converter

    Publication Year: 1998 , Page(s): 1262 - 1267 vol.2
    Cited by:  Papers (5)
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    A piezoelectric-transformer (PT) is expected for a low-electric-noise device because it transmits power by mechanical vibration. However, there has been no study about noise of the PT so far. In this paper, we propose a model which focuses on a parasitic impedance of the PT, and compare its simulated result with an observed common-mode noise in the PT DC-DC converter to confirm a mechanism of the common-mode noise occurrence. As a result, we found that the parasitic impedance between the input and output terminals of the PT provides the path for common-mode noise. Furthermore, we propose an improved version of the PT DC-DC converter to reduce the common-mode noise, that is based on this noise analysis. As a result, drastic noise reduction was achieved View full abstract»

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  • Alternative methods of estimating the magnetising characteristics and the rotor time constant for the induction machine vector control

    Publication Year: 1998 , Page(s): 973 - 978 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (436 KB)  

    Two different methods to evaluate the induction machine parameters for the indirect vector control are proposed. The routines are carried out with an inverter-fed induction machine to estimate the magnetising inductance, M, and the rotor time constant, Tr, needed to tune the controllers. One of the methods utilises the slip equation of the field oriented induction machine to develop recursive estimators for the parameters. The other one uses the Kalman filter and the discrete model of the machine to obtain the required parameters. Both methods are based on the stator current error vector as a reference to the parameters' level of uncertainty. Simulation results show the identification of these parameters by both methods for six different reference excitation levels. The effectiveness of the methods is discussed throughout the paper View full abstract»

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  • A single-stage rectifier with PFC and fast regulation of the output voltage

    Publication Year: 1998 , Page(s): 1642 - 1648 vol.2
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    This paper describes a new way to increase the efficiency and to reduce the size and cost in power factor correctors with fast regulation of the output voltage by integration of power factor corrector and DC/DC regulator in the rectifier with only one control stage. With this converter, a high power factor and a tight regulated output voltage are achieved. The proposed converter has advantages such as efficiency and size over the two stage structure, and simplicity over other single stage solutions. Experimental results and design consideration are presented View full abstract»

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  • An improved zero voltage and zero current switching full bridge PWM converter with secondary active clamp

    Publication Year: 1998 , Page(s): 948 - 954 vol.2
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    An improved zero voltage and zero current switching (ZVZCS) full bridge (FB) PWM converter is proposed to solve the problems of the previously presented ZVZCS-FB-PWM converter with secondary active clamp such as narrow ZVS range of leading-leg switches. By adding an auxiliary inductor in between the leading-leg and separated input source voltages, the ZVS of leading leg switches can be extended to the whole line and load ranges, which eliminates unwanted hard switching of clamp switch and simplifies its control. The principle of operation is explained and analyzed. The features and design considerations of the proposed converter are also illustrated and verified on a 3 kW, 100 kHz IGBT based experimental circuit View full abstract»

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  • Novel current mode bi-directional high-frequency link DC/AC converter for UPS

    Publication Year: 1998 , Page(s): 1867 - 1871 vol.2
    Cited by:  Papers (8)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    The novel current mode bidirectional high-frequency link DC/AC power converter proposed in the paper is based on the flyback power converter. Its operation modes, basic operational principle, instantaneous voltage control method and brief design are explained. The experimental result of 250 W/50 Hz output power with 50 kHz switching frequency shows that the proposed HFL converter has the following advantages: bidirectional power flow; fewer components; small size; light weight; simple control scheme; good dynamic response; and high efficiency View full abstract»

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  • A new DC-to-DC ZVS PWM converter for high input voltage applications

    Publication Year: 1998 , Page(s): 967 - 972 vol.2
    Cited by:  Papers (4)
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    A new three-level DC-to-DC converter controlled by pulse-width modulation is proposed in this paper. This converter is suitable for high input voltage and high power applications featuring zero-voltage switching and half of the input voltage as the maximum voltage across the switches. The complete operating principle, theoretical analysis, relevant equations and design example are provided in this paper. The experimental results of a 1.5 kW prototype, operating at 50 kHz rated at 600 V input voltage and 25 A output current, are presented View full abstract»

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  • Practical object-oriented simulation approach for active PFC converter with digital control

    Publication Year: 1998 , Page(s): 1098 - 1104 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB)  

    In this paper, an efficient power electronic circuit simulation approach of a single-phase active PFC power converter system is discussed. The control circuit simulation software algorithm used in this simulation technique can also be applied to a digital signal processor (DSP) for the control of a practical power factor conversion circuit. This circuit simulation technique is based on a circuit equation modeled by substituting control input dependent time-varying resistors in place of active power switches and passive diodes incorporated into the active PFC converter circuit treated here, one state-vector equation described by state-variables for inductors and capacitors together with an algebraic computation method to transform the matrices of the circuit equation into matrices of the state vector equation. In addition, this paper proves the effectiveness of a single-phase PFC power converter with digital control strategy and its performance evaluation on the basis of computer-aided simulation View full abstract»

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  • Insulated gate triac: device operation and applications

    Publication Year: 1998 , Page(s): 1180 - 1185 vol.2
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    A new three-terminal power switch is described. The MOS-gated bi-directional device has forward and reverse conducting paths that utilize the same area, thus saving silicon space significantly. A single MOS-gate controls the current flow in both the forward and reverse directions. Two examples of power electronic applications that benefit from the use of this device are briefly discussed View full abstract»

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  • Improved capacitance model for power bipolar transistor turn-off performance

    Publication Year: 1998 , Page(s): 1214 - 1218 vol.2
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    High voltage bipolar transistors are widely employed in many power supplies and most self-oscillating electronic ballasts for voltage applications up to 600 V. At the time of turn-off, these devices show significant storage time and fall time. This paper presents a new model to predict the fall time performance of power bipolar transistors. This is achieved by redefining the effective depletion capacitance to account for stored charge in the drift region of a power bipolar transistor in high level injection. The authenticity of the model is tested under various hard and soft switching load conditions. The model will enable better simulation of bipolar transistor turn-off characteristics in applications such as electronic lamp ballasts View full abstract»

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  • A novel test equipment for resonant circuits in high input voltage soft switching type DC-AC inverters and DC-DC converters

    Publication Year: 1998 , Page(s): 1985 - 1990 vol.2
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    Recently, soft-switching techniques have been gradually introduced into DC-AC inverters and DC-DC power converters. The resonance phenomena generated by the inductor and capacitor are usually employed to achieve the soft-switching of main power switches and diodes in these power conversion circuits. In this paper, novel test equipment for resonant circuits is proposed and analysed, enabling the examination of the performance characteristics of the inductor and capacitor in high-voltage resonant circuits by using a relatively low voltage power supply View full abstract»

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  • Charge control modeling during transient behavior of PT-IGBT using PSpice macromodel

    Publication Year: 1998 , Page(s): 1704 - 1710 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (504 KB)  

    A new PSpice model of punch-through (PT) IGBTs is developed to account for the presence of the buffer layer and its influence on the dynamic behavior of the device. The recombination and redistribution of charge in the base region of IGBTs during a transient behavior are modeled and represented by equivalent electric circuits. In particular, the effect of the external voltage (clamping voltage) on the tail current decay is modeled. Besides, phenomena such as the “tail bump” and the variation of the slope in the initial part of the output voltage Vce during a turn-off transient are modeled. The proposed model is validated by comparing several simulation runs to the experimental traces at different static and dynamic working conditions View full abstract»

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  • A 100 kVA power conditioner for three-phase four-wire emergency generators

    Publication Year: 1998 , Page(s): 1906 - 1911 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (556 KB)  

    A 100 kVA power conditioner for three-phase four wire emergency generators is presented to compensate current harmonics and asymmetries caused by nonlinear and/or unbalanced loads. Three-phase voltage type converter with split-dc-capacitor is adopted as the power circuit and a new direct source current control method is suggested, which simplifies the controller. The proposed power conditioner shapes the generator current sinusoidally inphase with the voltage and allows the generator to supply maximum power even to single phase loads. An IGBT based 100 kVA prototype with the controller realized with a DSP (TMS320C32) is built and tested to verify the performance of the power conditioner View full abstract»

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  • A fast and stable simulation algorithm with self-optimization of time step for switching power converters

    Publication Year: 1998 , Page(s): 1105 - 1110 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (284 KB)  

    This paper presents a new fast and stable simulation algorithm for switching power converters. This algorithm satisfies all requirements for the algorithm, such as accuracy, speed, stability and easiness. Especially, this algorithm automatically optimizes a time step to get fast simulation, and it converges the simulation in any type of power converters View full abstract»

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  • Field oriented control of a single-phase induction motor drive

    Publication Year: 1998 , Page(s): 990 - 996 vol.2
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    This paper investigates the vector control of a single-phase induction motor drive to implement low cost systems for low power applications. The static power converter side is implemented using a single-phase rectifier cascaded with a four-switch inverter (FSI). The vector control is based on the field orientation concepts that were adapted for this type of machine. Simulation and experimental results are provided to illustrate the operation of the systems View full abstract»

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  • A novel simplified space-vector modulated control scheme for three-phase switch-mode rectifier

    Publication Year: 1998 , Page(s): 1358 - 1361 vol.2
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    A novel simplified control scheme for three-phase switch-mode rectifier is proposed in this paper. The proposed control scheme is based upon a load-conductance rectifier controller, in which reference current signals are obtained. The goal to follow the reference current is converted to follow a reference voltage. A simplified control scheme utilizing space-vector modulation is developed to calculate the duty ratio required to synthesize the reference voltage. The proposed scheme has the advantage of space-vector modulation with fast dynamic response, and is simple enough to be implemented in a low-cost microprocessor View full abstract»

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  • Turn-off failure of IGBTs under clamped inductive load

    Publication Year: 1998 , Page(s): 1191 - 1195 vol.2
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB)  

    This paper reports the mechanism of failure of IGBTs during clamped inductive switching stress. With the help of measurements and two-dimensional (2-D) numerical simulations, the turn-off failure of IGBTs under clamped inductive load is shown to occur due to thermally assisted carrier multiplication at the reverse biased planar p-base n-drift junction. The failure mechanism is unchanged even if the IGBT is susceptible to latch-up in static conditions View full abstract»

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  • Analysis and design of regenerative load system for power system test

    Publication Year: 1998 , Page(s): 1625 - 1630 vol.2
    Cited by:  Papers (1)
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    This paper presents a regenerative load system to replace the conventional passive load for the long-term testing of power equipment and motor-generator sets. This system has three merits: economic, safety and power quality improvement. The energy consumption can be less than 20% of the passive load and the utility source current can be shaped into a pure sinusoidal waveform with power factor near to unity. For realism, the utility source inductance is taken into consideration. Through root-locus analysis and PSpice simulation, the authors conclude that for a stable system, the following conditions must be met: (1) the addition of a damping circuit; and (2) the current gain of the inverter must be kept below one. In addition, they have developed a simple control method to regulate the energy-storage capacitor voltage, using the energy-balance concept and a memory circuit to calculate the required utility source current. The transient response is less than two cycles. Finally, PSpice simulation and experimental results are provided to verify the feasibility of this regenerative load system View full abstract»

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  • A new split source type converter for SRM drives

    Publication Year: 1998 , Page(s): 1290 - 1294 vol.2
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB)  

    This paper describes a new split source-type power converter topology for switched reluctance motor drives. The new converter topology consists of 2 DC link capacitors, 6 switches and 6 diodes with 2 switches and 2 diodes added to a conventional split source power converter to drive an 8/6 pole SRM. The main advantage of the proposed converter is fast suppression of the tail current in the phase-winding, hence resulting in the minimization of negative torque using doubly boosted voltage in the demagnetizing mode. The control characteristics of the proposed converter is compared with those of the asymmetric bridge power converter that is widely used. Through laboratory experiments, the proposed power converter has shown higher efficiency and more output power than any other counterpart under heavy load conditions and/or in high-speed operation View full abstract»

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