Ultra Compact Three-phase PWM Rectifier

Karutz, P.; Round, S.D.; Heldwein, Marcelo Lobo; Kolar, J.W.

doi:10.1109/apex.2007.357609

Cited by 30 publications

(10 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For typical SJ devices, this capacitance rises from a few 100 pF to over 10 nF for low-blocking voltage levels. As reported in [10], this effect causes long delay times at turn-off of the device that results in significant current distortions at lower current levels. This effect is even more distinctive if higher switching frequencies are used or if a device with a large chip area is applied.…”

Section: Introductionmentioning

confidence: 90%

On the Tradeoff Between Input Current Quality and Efficiency of High Switching Frequency PWM Rectifiers

Hartmann

Ertl

Kolar

2012

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

Due to their basic physical properties, power MOSFETs exhibit an output capacitance C oss that is dependent on the drain-source voltage. This (nonlinear) parasitic capacitance has to be charged at turn-off of the MOSFET by the drain-source current in rectifier applications that yield input current distortions. A detailed analysis shows that the nonlinear behavior of this capacitance is even more pronounced for modern super junction MOS-FET devices. Whereas C oss increases with increasing chip area, the on-state resistance of the MOSFET decreases accordingly. Hence, a tradeoff between efficiency and input current distortions exists. A detailed analysis of this effect considering different semiconductor technologies is given in this study and a Pareto curve in the η-THD I space is drawn that clearly highlights this relationship. It is further shown that the distortions can be reduced considerably by the application of a proper feedforward control signal counteracting the nonlinear switching delay due to C oss . The theoretical considerations are verified by experimental results taken from 10-kW laboratory prototypes with the switching frequencies of 250 kHz and 1 MHz.Index Terms-Efficiency, high-frequency power converters, input current quality, super junction (SJ).

show abstract

Section: Introductionmentioning

confidence: 90%

On the Tradeoff Between Input Current Quality and Efficiency of High Switching Frequency PWM Rectifiers

Hartmann

Ertl

Kolar

2012

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

“…In this model some details, such as the impedance of the mains, the characteristics of the EMI-filter, the delay times of the switches or the characteristic right hand zero of the boost circuit are not considered for sake of simplicity. Previous work on a 400 kHz VR system [5] showed that a simple P+Lag controller…”

Section: B Controller Designmentioning

confidence: 99%

“…A classical analog approach for current control shows several problems, such as limited accuracy and configurability [3], [4]. Using purely digital current control, by application of a modern high speed DSP, is a good way to control these rectifiers for medium and high switching frequencies (fs = 20 kHz…200 kHz) [5]. However, for very high switching frequencies of over 1 MHz even these digital systems reach their limit and a current controller can not be realized using just a single DSP.…”

Section: Introductionmentioning

confidence: 99%

High-frequency, three-phase current controller implementation in an FPGA

Hartmann

Round

Kolar

2008

2008 11th Workshop on Control and Modeling for Power Electronics

Self Cite

View full text Add to dashboard Cite

Three phase rectifiers with switching frequencies of 500 kHz or more require high speed current controllers. At such high switching frequencies analog controllers as well as high speed DSP-systems have limited performance. In this paper, two high speed current controller implementations using two different FPGAs -one for switching frequencies up to 1 MHz and one for switching frequencies beyond 1 MHz -are presented to overcome this performance limitation. Starting with the digital system design all the blocks of the signal chain, containing A/D interface, digital controller implementation using HW-multipliers and implementation of a novel high speed, high resolution PWM are discussed and compared. Final measurements verify the performance of the controllers.

show abstract

“…The CSC equivalent to a VSR-fed VSI (or VSR-VSI) is a CSR front end to a voltage boosting Current Source Inverter (CSI) to synthesize AC output. Work that has quantified the power density of CSRs and CSR-CSI based VFDs has focused on a Silicon Carbide (SiC)-based CSR or CSR-CSI because these topologies are compatible with presently available SiC MOSFETs and JFETs [5], [6], [11], [12], [14]. This work has been forward-looking, projecting power densities of up to 30kW/liter with switching frequencies >100kHz.…”

Section: Iintroductionmentioning

confidence: 99%

“…This paper also identifies that a distinct characteristic of CSCs is its behavior during discontinuous current mode (DCM) of operation at light loads. The switching frequency usual increased to minimize DC link current ripple and avoid DCM [5], [6], [11], [12], [14]. Without some mitigation of DCM steering diodes and dynamic brake circuitry is required to mitigate over voltage phenomena in the advent of DCM [10], reducing both power density and efficiency.…”

Section: Iintroductionmentioning

confidence: 99%

Power density and efficiency of system compatible, sine-wave input/output drives

Cuzner¹,

Drews²,

Venkataramanan

2012

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

View full text Add to dashboard Cite

The benefits of Variable Frequency Drives (VFDs) have not been fully realized in many applications because they compete in the power density of legacy equipment, such as electro-mechanical motor controllers. This is especially the case in Navy shipboard systems where sensitive equipment is in close proximity to VFDs. In this context, this paper compares the power densities, efficiencies and costs of a Voltage Source Converter (VSC), Current Source Converter (CSC) and mixed VSC/CSC based VFDs. A meaningful comparison is made based upon an actual hardware implementation that meets stringent power quality and electromagnetic compatibility (EMC) requirements. Hardware results of a CSC/VSC based VFD are provided in order to support the findings of the study. Special consideration is given to operation at light loads.

show abstract

Ultra Compact Three-phase PWM Rectifier

Cited by 30 publications

References 5 publications

On the Tradeoff Between Input Current Quality and Efficiency of High Switching Frequency PWM Rectifiers

On the Tradeoff Between Input Current Quality and Efficiency of High Switching Frequency PWM Rectifiers

High-frequency, three-phase current controller implementation in an FPGA

Power density and efficiency of system compatible, sine-wave input/output drives

Contact Info

Product

Resources

About