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# IET Power Electronics

## Filter Results

Displaying Results 1 - 13 of 13
• ### High power factor transformerless single-stage single-phase ac to high-voltage dc converter with voltage multiplier

Publication Year: 2012, Page(s):149 - 157
Cited by:  Papers (6)
| | PDF (793 KB)

This study proposes a transformerless single-stage single-phase ac to high-voltage dc converter based on Cockcroft-Walton (CW) voltage-multiplier circuit with only adding one bi-directional switch and one boost inductor. This study also derives a new method of circuit representation for CW voltage multiplier, which simplifies the equivalent circuit and is convenient for simulation. Compared with c... View full abstract»

• ### Family of non-isolated zero current transition bi-directional converters with one auxiliary switch

Publication Year: 2012, Page(s):158 - 165
Cited by:  Papers (11)
| | PDF (663 KB)

A new family of non-isolated zero current transition bi-directional converters is introduced. Basic non-isolated bi-directional DC-DC converters are derived by combining basic DC-DC converters and they are able to transfer energy between two DC sources using two main switches. In the proposed bi-directional converters, instead of using two independent auxiliary circuits for each main switch, same ... View full abstract»

• ### Time-domain identification of pulse-width modulated converters

Publication Year: 2012, Page(s):166 - 172
Cited by:  Papers (4)
| | PDF (628 KB)

A discrete time domain-based system identification method for PWM DC-DC converters is proposed. Accurate information on the system's open-loop response is essential in the design of the system controller in order to obtain the desired closed-loop response. This is especially true in switch-mode converters where component uncertainty exists. It is conjectured in this study that an identification me... View full abstract»

• ### High-efficiency bidirectional dc-dc converter with high-voltage gain

Publication Year: 2012, Page(s):173 - 184
Cited by:  Papers (23)
| | PDF (1415 KB)

The aim of this study is to develop a high-efficiency bidirectional dc-dc converter for a power storage system. The proposed converter can boost the voltage of an energy-storage module (e.g. battery) to a high-voltage-side dc bus for the load demand. When the high-voltage-side dc bus has excess energy, this energy-storage module can be charged by the dc bus. In this study, a coupled-inductor bidir... View full abstract»

• ### Voltage-boosting converters with hybrid energy pumping

Publication Year: 2012, Page(s):185 - 195
Cited by:  Papers (11)
| | PDF (1515 KB)

Voltage-boosting converters with hybrid energy pumping are presented. Hence, the corresponding voltage conversion ratios are higher than the traditional boost converter or some existing voltage-boosting converters. Above all, by changing the circuit connection or turn-on types of switches, there are three voltage conversion ratios to be generated. Hence, there are three types of voltage-boosting c... View full abstract»

• ### Analysis of the ramp compensation approaches to improve stability for buck converters with constant on-time control

Publication Year: 2012, Page(s):196 - 204
Cited by:  Papers (8)
| | PDF (788 KB)

This study presents new sub-harmonic analysis for constant on-time control with ramp compensation. Ramp compensation of constant on-time control can be fulfilled by either directly feeding back a sensed inductor current signal as an internal ramp or using an external compensation ramp with a fixed slope during the off time and a fixed level during the on time. Based on the inductor current informa... View full abstract»

• ### Bit-stream-based space vector modulators

Publication Year: 2012, Page(s):205 - 214
Cited by:  Papers (1)
| | PDF (946 KB)

Bit-stream-based control, which uses one bit wide signals to control power electronics applications, is a new approach for controller design in power electronic systems. This study presents a novel family of three-phase space vector modulators, which are based on the bit-stream technique and suitable for three-phase inverter systems. Each of the proposed modulators simultaneously converts a two-ph... View full abstract»

• ### Input filter pre-charge scheme for high-power PWM-current source rectifiers connected to a weak utility supply

Publication Year: 2012, Page(s):215 - 220
| | PDF (521 KB)

High-power PWM current source rectifiers are normally connected to the ac grid by means of a lightly damped LC input filter. Pre-charge schemes employing pre-insertion resistors are typically used to mitigate the over-voltage across the filter capacitors during the connection to the grid. However, noticeable distortion of the grid voltage may still occur during the insertion of the input filter to... View full abstract»

• ### Harmonic winding losses in the transformer of a forward pulse width modulated DC-DC converter for continuous conduction mode

Publication Year: 2012, Page(s):221 - 236
Cited by:  Papers (3)
| | PDF (1177 KB)

This study presents general winding power loss expressions for a high-frequency (HF) three-winding forward transformer operated in continuous conduction mode (CCM), where the source of the transformer excitation is considered to be non-sinusoidal with many significant harmonics. The efficient operation of an isolated converter is dependent upon the performance of the transformer used. The expressi... View full abstract»

• ### Passivity-based control of an asymmetric nine-level inverter for harmonic current mitigation

Publication Year: 2012, Page(s):237 - 247
Cited by:  Papers (1)
| | PDF (865 KB)

In this study is approached the design problem of a control law for an asymmetric nine-level multilevel cascade inverter when it is implemented as active filter for harmonic current mitigation purposes. Two are the main features of the proposed controller, namely, its structure is defined considering at a fundamental level the precise establishment, in terms of mathematical expressions, of the ste... View full abstract»

• ### New technique for inductive power transfer using a single controller

Publication Year: 2012, Page(s):248 - 256
Cited by:  Papers (19)
| | PDF (753 KB)

Inductive power transfer (IPT) technology has become a preferred technique for supplying contactless power to numerous applications, ranging from microwatt bio-engineering devices to high-power battery charging systems. Typical IPT systems employ two separate controllers, one on the powering or primary side and the other on the receiving or pick-up side of the system, to facilitate contactless p... View full abstract»

• ### Winding resistance of litz-wire and multi-strand inductors

Publication Year: 2012, Page(s):257 - 268
Cited by:  Papers (50)
| | PDF (1448 KB)

This study presents an approximate model for multi-strand wire winding, including litz-wire winding. The proposed model is evaluated using Dowell's equation. The model takes into account the existence of proximity effect within the litz-wire bundle between the strands and between the bundles, as well the skin effect. The expressions for optimum strand diameter and number of strands at which minimu... View full abstract»

• ### Sensorless control of induction motors using multi-level converters

Publication Year: 2012, Page(s):269 - 279
Cited by:  Papers (2)
| | PDF (1303 KB)

This study describes a sensorless speed control scheme for induction motors supplied by a multi-level inverter. The scheme exploits the low DC link voltage used in some of the multi-level converter configurations which employ H-Bridges. The rotor position is tracked by measuring the rate of change of motor stator currents when low-voltage test vectors are applied using the H-Bridges. In this way, ... View full abstract»

## Aims & Scope

IET Power Electronics brings together five principal power electronics themes including: applications of power semiconductor technology; circuits; devices; techniques; and performance management.

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