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This paper describes the boost mode test of a current source inverter (CSI) fed permanent magnet synchronous motor (PMSM) drive. By using a dc-dc converter together with the CSI, the output voltage of the CSI can be boosted. The modified field oriented control scheme for this CSI PMSM drive is explained and tested in real-time control. The modeling and experimental results show the CSI can drive the...
A simulation software, based on a SPICE kernel, is presented in order to study the interaction between power components and their drivers. It provides a complete environment to perform simulation of power electronics systems and their associated digital control laws. Efficient IGBT and diode models, which describe accurately a wide variety of IGBT and freewheeling diode components, are included with...
This paper compares the performance of Switched-Capacitor (SC) and inductor-based DC-DC conversion technologies. A metric to compare between the two topologies is discussed, and is used to compare switch utilization. Fundamental limits on utilization of reactive elements developed in the literature for all DC-DC converters are also reviewed and discussed, and this analysis shows that popular SC and...
Dynamic power consumption in the gate-drive circuitry limits the light-load efficiency of high frequency integrated dc-dc converters. In this paper a power MOSFET gate charge recycling technique is introduced, where the output capacitor is used to store a portion of the gate charge between switching events. The charge is transferred between the gate of power MOSFET and the output capacitor using transmission...
This paper is focused on the measurement of a Bode plot of a switching power converter from a single simulation in the time domain by means of a multisine signal. The proposed procedure allows an important saving in simulation time compared to a single-tone injection approach. It can be especially useful in the case of evaluating power converters with digital compensators by means of simulation tools...
Parallel operation of PWM rectifiers and inverters has been used in UPS, motor drives, telecom power supply, and other applications to reduce system development cost and to provide easy power scalability as well as redundancy. Conventional symmetric interleaving can eliminate certain harmonics and their sideband components but is not necessarily optimal for EMI filter design if the filter attenuation...
The causes for which fast-hard-switching operation may differ from the traditional clamped inductive switching mode are mainly attributed to the parasitic loop inductances of PCB and device package as well as the parasitic output capacitances of the semiconductor switch. These parasitic elements form the basis of the proposed model, which fundamentally represents the dynamics of hard-switched converters...
A hybrid control scheme of a regulated multi-modes charge pump and its modeling are proposed in this paper. It can achieve very high efficiency over wide input and load range. It is controlled to adaptively change the conversion mode at different input voltage. It also combines device segmentation and pulse skipping modulation to improve the efficiency over a wide load range. Due to the complexity...
Using a variable frequency, or spread spectrum clock in switched-mode power supplies is a popular method for reducing EMI in noise-sensitive applications. A system that operates with a fixed frequency-spread must inevitably be over-designed to compensate for the uncertainties in the parasitic components, as well as aging and temperature effects. In this work, a self-calibrated, adaptive spread spectrum...
This paper presents a fully integrated capacitive DC/DC-converter with a gearbox type topology. By merging multiple topologies the output voltage range is increased. The dual loop digital control improves load regulation compared with a conventional hysteretic control and reduces ripple under low load operation. The converter was implemented in a 90 nm CMOS technology and measurements are presented.
This paper focuses on fault evolution in a photovoltaic array during night-to-day transition. The effect of a maximum power point tracker on fault current is first discussed. When a PV fault occurs in daylight, overcurrent protection devices work properly. However, when the same fault occurs at night, our results demonstrate that the fault current is difficult to detect. As a result, the fault might...
Markov reliability models to estimate Photovoltaic (PV) inverter reliability are proposed for utility-interactive systems. These are then extended to generate a unified PV energy-yield model. The integrated reliability-energy yield framework is superior to conventional methods as it accounts for inverter failures and repairs. The proposed analytical framework is utilized to compare conventional central...
This paper focuses on a mixed-signal IC realization of a digitally controlled power converter which steps up/down from 2.7-5.5 V to 1-3.6 V for battery powered portable applications. In particular, in this work a Σ-Δ modulated digital pulse-width modulator is combined with a low power second-order multi-bit Σ-Δ ADC in a 0.5 μm CMOS process. It is shown that precise output voltage positioning in buck,...
Silicon carbide (SiC) MOSFET power devices are expected to replace silicon IGBTs in power electronics applications requiring higher efficiency and power density, as well as capability to operate at higher temperatures. This paper reports on the development of high efficiency SiC power MOSFETs, power modules and switching converters at GE. The prototype 30A, 1200V discrete devices have on-resistance...
The SIDO converter is appealing in low-power applications requiring two independent supply voltages. The use of a single inductor significantly reduces the cost and size of the converter, however the complexity of the controller is greatly increased due to the inherent coupling of the two output voltages in continuous conduction mode. The accuracy of the traditional averaging technique is examined...
This paper presents modeling of line-frequency converters with and without phase control. The operation of the converters can be described by two algebraic equations based on defined mapping functions. Unlike previous work that develops the mapping functions using direct Fourier expansion, double-Fourier series method is applied to avoid the assumption on the perturbation frequency. The resulting...
Use of small dc bus capacitors is desirable in variable-speed drives and distributed power systems as it can reduce the size and improve reliability of the system. However, small dc bus capacitors may lead to instability of the dc bus voltage. Such voltage stability problem can occur when the bus is fed from a PWM rectifier or a line-frequency rectifier. This paper considers the case when a line-frequency...
This paper presents a predictive method of current control for grid connected three level neutral point clamped inverter in synchronous rotating frame. The predictive current controller calculates the inverter voltage required to force the load current to follow the reference. To validate the performance the computational time has been compared with DSP processor TMS320C240 and the maximum permissible...
In this paper, a double closed loop current controller is proposed for Parallel Hybrid Active Power Filter (PHAPF) characterized by series connection of a three-phase single-tuned series resonance LC filter for the seventh harmonic frequency and a low voltage rating three-phase voltage source PWM inverter. The proposed controller is composed by a grid current feedback control and a 5th harmonic of...
Concerns about the consumption of energy by information technology (IT) equipment are driving a concerted effort to manage and reduce this power consumption. One of the most important metrics for energy management systems is the current power consumption. IT equipment power supplies are now generally required to report their input power with accuracy in the range of 2-5%. This paper describes some...
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