2006 IEEE International Symposium on Circuits and Systems
The AC side current of some high switching frequency AC-DC converters may be programmed so as to ... more The AC side current of some high switching frequency AC-DC converters may be programmed so as to draw a sinusoidal current with adjustable amplitude and phase with respect to at AC applied voltage. This may be viewed as virtual capacitance emulation. Simultaneously to rectifying real power, such converters may be applied for compensation of reactive power system currents and for
This paper considers a unique type of multitude DC/DC conversion ratios switched capacitor conver... more This paper considers a unique type of multitude DC/DC conversion ratios switched capacitor converter. The multitude conversion ratios enable the converter to be able to be almost continuous and competitive to inductive based converters. The paper summarizes the basic rules of the topology as well as presenting two possible ways of implementing the topology. The paper also discusses the difference between the series type topology and the parallel one as well as the reasons to implement the latter type of converter. The topologies are presented theoretically as well as the actual prototype characteristics and experimental results.
2016 IEEE International Conference on the Science of Electrical Engineering (ICSEE), 2016
This paper considers the operation and the control of the General Transposed Series-Parallel Swit... more This paper considers the operation and the control of the General Transposed Series-Parallel Switched Capacitor Converter. The paper reviews the complex topology of this type of converter as well as addresses the control scheme of the converter. The paper shows the advantage of this converter in voltage regulation due to its multitude input/output voltage ratio. Moreover, these multitude voltage ratios require a control system that is based a look up table as well as considerations regarding the discrete nature of this converter.
IEEE Microwave and Wireless Components Letters, 2021
A new power amplifier (PA) efficiency enhancement technique using short-time Fourier transform (S... more A new power amplifier (PA) efficiency enhancement technique using short-time Fourier transform (STFT) in envelope tracking (ET) topology is introduced. The proposed technique produced a time–frequency matrix that illustrated the signal spectrum at each time frame. The applied filter was made time variant by setting a threshold for the preserved power percentage at each time frame. The technique gave full control over the tradeoff between bandwidth (BW) reduction and power consumption efficiency and provided a significant BW reduction over pure ET. The proposed method was demonstrated on a 37 dBm, 40-MHz long-term evolution signal at 2.4 GHz, using 65 W 3-dB compression-point GaN PA. The resulting efficiencies were 38.6% [16-quadrature amplitude modulation (QAM)] and 41.9% (64-QAM).
... POPI concept is presented. The POPI is a black box without source elements, in which the in... more ... POPI concept is presented. The POPI is a black box without source elements, in which the instantaneous output power equals the input. A method based on a controlled time-variable transformer is presented. It is interesting ...
... B. Stabilization of Gas Laser Systems by LFR's The plasma tube of a gas laser system has... more ... B. Stabilization of Gas Laser Systems by LFR's The plasma tube of a gas laser system has a ... tube, by a current source, implies a stable mode of operation without application of ballast resistors. ... The ideal CSC is a loss-free storage-ele-ment-less two-port element which transfers ...
IEEE Transactions on Circuits and Systems I: Regular Papers, 2015
In this paper the power losses of efficient capacitive converters with multitude transfer ratio v... more In this paper the power losses of efficient capacitive converters with multitude transfer ratio values are discussed. The loss mechanism circuits, based on general transposed series parallel (GTSP) topology, is studied and the losses are calculated, which in turn enables the “bottlenecks” to be identified and overcome. The calculations show that for a given number of switching cells the power losses of such converters are mainly dependent on the voltage conversion ratio, the topology function, the resistances of the switches in on and off states, the ESR of the capacitors, the switching frequency, the voltage drop, and the load. The theory explains the fact that was observed in experiments, that for low voltage conversion ratio values, efficiency decrease was measured. It is shown that for these low voltage ratio values the mechanism associated to the off resistance of the switches is more dominant and reduces the efficiency. This power loss estimation can be used as a powerful tool for the performance optimization of capacitive converters. The theoretical results are verified experimentally on a 10-cell GTSP converter prototype. The experimental results show good agreement with the proposed theory.
2008 IEEE 25th Convention of Electrical and Electronics Engineers in Israel, 2008
Modern wireless communication transmit systems require power efficient and linear power amplifier... more Modern wireless communication transmit systems require power efficient and linear power amplifiers. This paper investigates different topologies of power processing systems applied to EDGE and WLAN systems, based on envelope elimination and restoration (EER). The analysis takes into account the power distribution of the signals, the the power dissipated at the source and the output power. By comparing the power
IEE Proceedings - Electric Power Applications, 2006
ABSTRACT A systematic procedure to synthesise power gyrators for variable switching frequency ope... more ABSTRACT A systematic procedure to synthesise power gyrators for variable switching frequency operation is presented. Based on the gyrator equations, topological constraints are first established and two types of gyrators, i.e. G and R, are defined. A boost converter with an output filter and the Cuk converter are shown to have the unconditionally stable characteristics of G-gyrators with a controlled input current whereas a buck converter with an input filter and also the Cuk converter are shown to behave as G-gyrators with a controlled output current if damping networks are inserted and certain stability conditions are accomplished. Similarly, a boost converter with an output filter is shown to behave as a power R-gyrator with stable dynamics
A four-stage inductive storage XRAM (inverse MARX) circuit was used to amplify current and power.... more A four-stage inductive storage XRAM (inverse MARX) circuit was used to amplify current and power. By means of switching action, individual inductors are charged in series and discharged in parallel to the load. A microprocessor controls the timing of the switches, which results in a predetermined load current waveform. The use of present asymmetric GTOs at much higher currents than rated allowed the amplification and shaping of a 2.5 kA charging current to 9.6 kA at the load. An energy of 25 kJ was transferred to the load, yielding 84% efficiency. The losses were mainly due to the winding resistance of the inductors. With the best-performance commercially available GTOs, this circuit may deliver over 100 kJ with an energy density of 1.6 kJ/kg. Simulation and experimental results are presented
... 11. THE POPI CONCEPT The POPI network is a black box power processing unit that controls th... more ... 11. THE POPI CONCEPT The POPI network is a black box power processing unit that controls the inputioutput voltages and currents such that the instantaneous output power and input power are equal. For a two-port network ...
2006 IEEE International Symposium on Circuits and Systems
The AC side current of some high switching frequency AC-DC converters may be programmed so as to ... more The AC side current of some high switching frequency AC-DC converters may be programmed so as to draw a sinusoidal current with adjustable amplitude and phase with respect to at AC applied voltage. This may be viewed as virtual capacitance emulation. Simultaneously to rectifying real power, such converters may be applied for compensation of reactive power system currents and for
This paper considers a unique type of multitude DC/DC conversion ratios switched capacitor conver... more This paper considers a unique type of multitude DC/DC conversion ratios switched capacitor converter. The multitude conversion ratios enable the converter to be able to be almost continuous and competitive to inductive based converters. The paper summarizes the basic rules of the topology as well as presenting two possible ways of implementing the topology. The paper also discusses the difference between the series type topology and the parallel one as well as the reasons to implement the latter type of converter. The topologies are presented theoretically as well as the actual prototype characteristics and experimental results.
2016 IEEE International Conference on the Science of Electrical Engineering (ICSEE), 2016
This paper considers the operation and the control of the General Transposed Series-Parallel Swit... more This paper considers the operation and the control of the General Transposed Series-Parallel Switched Capacitor Converter. The paper reviews the complex topology of this type of converter as well as addresses the control scheme of the converter. The paper shows the advantage of this converter in voltage regulation due to its multitude input/output voltage ratio. Moreover, these multitude voltage ratios require a control system that is based a look up table as well as considerations regarding the discrete nature of this converter.
IEEE Microwave and Wireless Components Letters, 2021
A new power amplifier (PA) efficiency enhancement technique using short-time Fourier transform (S... more A new power amplifier (PA) efficiency enhancement technique using short-time Fourier transform (STFT) in envelope tracking (ET) topology is introduced. The proposed technique produced a time–frequency matrix that illustrated the signal spectrum at each time frame. The applied filter was made time variant by setting a threshold for the preserved power percentage at each time frame. The technique gave full control over the tradeoff between bandwidth (BW) reduction and power consumption efficiency and provided a significant BW reduction over pure ET. The proposed method was demonstrated on a 37 dBm, 40-MHz long-term evolution signal at 2.4 GHz, using 65 W 3-dB compression-point GaN PA. The resulting efficiencies were 38.6% [16-quadrature amplitude modulation (QAM)] and 41.9% (64-QAM).
... POPI concept is presented. The POPI is a black box without source elements, in which the in... more ... POPI concept is presented. The POPI is a black box without source elements, in which the instantaneous output power equals the input. A method based on a controlled time-variable transformer is presented. It is interesting ...
... B. Stabilization of Gas Laser Systems by LFR's The plasma tube of a gas laser system has... more ... B. Stabilization of Gas Laser Systems by LFR's The plasma tube of a gas laser system has a ... tube, by a current source, implies a stable mode of operation without application of ballast resistors. ... The ideal CSC is a loss-free storage-ele-ment-less two-port element which transfers ...
IEEE Transactions on Circuits and Systems I: Regular Papers, 2015
In this paper the power losses of efficient capacitive converters with multitude transfer ratio v... more In this paper the power losses of efficient capacitive converters with multitude transfer ratio values are discussed. The loss mechanism circuits, based on general transposed series parallel (GTSP) topology, is studied and the losses are calculated, which in turn enables the “bottlenecks” to be identified and overcome. The calculations show that for a given number of switching cells the power losses of such converters are mainly dependent on the voltage conversion ratio, the topology function, the resistances of the switches in on and off states, the ESR of the capacitors, the switching frequency, the voltage drop, and the load. The theory explains the fact that was observed in experiments, that for low voltage conversion ratio values, efficiency decrease was measured. It is shown that for these low voltage ratio values the mechanism associated to the off resistance of the switches is more dominant and reduces the efficiency. This power loss estimation can be used as a powerful tool for the performance optimization of capacitive converters. The theoretical results are verified experimentally on a 10-cell GTSP converter prototype. The experimental results show good agreement with the proposed theory.
2008 IEEE 25th Convention of Electrical and Electronics Engineers in Israel, 2008
Modern wireless communication transmit systems require power efficient and linear power amplifier... more Modern wireless communication transmit systems require power efficient and linear power amplifiers. This paper investigates different topologies of power processing systems applied to EDGE and WLAN systems, based on envelope elimination and restoration (EER). The analysis takes into account the power distribution of the signals, the the power dissipated at the source and the output power. By comparing the power
IEE Proceedings - Electric Power Applications, 2006
ABSTRACT A systematic procedure to synthesise power gyrators for variable switching frequency ope... more ABSTRACT A systematic procedure to synthesise power gyrators for variable switching frequency operation is presented. Based on the gyrator equations, topological constraints are first established and two types of gyrators, i.e. G and R, are defined. A boost converter with an output filter and the Cuk converter are shown to have the unconditionally stable characteristics of G-gyrators with a controlled input current whereas a buck converter with an input filter and also the Cuk converter are shown to behave as G-gyrators with a controlled output current if damping networks are inserted and certain stability conditions are accomplished. Similarly, a boost converter with an output filter is shown to behave as a power R-gyrator with stable dynamics
A four-stage inductive storage XRAM (inverse MARX) circuit was used to amplify current and power.... more A four-stage inductive storage XRAM (inverse MARX) circuit was used to amplify current and power. By means of switching action, individual inductors are charged in series and discharged in parallel to the load. A microprocessor controls the timing of the switches, which results in a predetermined load current waveform. The use of present asymmetric GTOs at much higher currents than rated allowed the amplification and shaping of a 2.5 kA charging current to 9.6 kA at the load. An energy of 25 kJ was transferred to the load, yielding 84% efficiency. The losses were mainly due to the winding resistance of the inductors. With the best-performance commercially available GTOs, this circuit may deliver over 100 kJ with an energy density of 1.6 kJ/kg. Simulation and experimental results are presented
... 11. THE POPI CONCEPT The POPI network is a black box power processing unit that controls th... more ... 11. THE POPI CONCEPT The POPI network is a black box power processing unit that controls the inputioutput voltages and currents such that the instantaneous output power and input power are equal. For a two-port network ...
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Papers by Sigmond Singer