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This paper presents a diagnostic study on the regular sampled Space Vector PWM (SVPWM) for sub-harmonics, when operated with fractional carrier ratios in variable frequency applications. Also a modified approach is proposed for refinement of the harmonic profile of SVPWM with a low computational dynamic sampling and carrier generation. When inverters are operated at fractional fundamental frequencies...
This manuscript presents modified scheme of synchronous space-vector modulation allowing providing nonlinear dependences between the fundamental voltage and fundamental frequency of dual three-phase open-winding ac drive with four modulated inverters. Behavior of the system with six control modes (characterized by different dc-voltages and switching frequencies of inverters) and two nonlinear Voltage/Frequency...
Materials of this paper show possibility of realization of any nonlinear dependences between voltage and frequency (nonlinear V/F (Volt/Hertz) dependences) of the open-loop six-phase drive on the base of four inverters, controlled by specialized algorithms of space-vector modulation. Specific continuous and discontinuous schemes of modulation allow providing in this case symmetry of the phase voltage...
In this paper, an attempt to implement auto synchronization technique using Charge Pump Phase Locked Loop (CPPLL) for grid connected solar photovoltaic system (SPV) has been made. The main aim of this paper is to reduce the phase angle mismatch between the grid voltage and inverter voltage, which in turn would improve the quality of power delivered by eliminating the unwanted islanding condition....
This paper proposed a high efficiency standalone inverter design for Google Little Box Challenge (LBC). A full bridge inverter is designed with two high frequency legs and one low frequency leg. To improve the system efficiency, asymmetrical unipolar modulation is utilized and interleaved switching is used. The synchronization between high switching frequency leg and low switching frequency leg is...
This paper describes a universal sinusoidal modulator developed primarily for the multilevel cascaded H-bridges converters. The modulator was implemented as a FPGA entity and its versatile features allows it to be easily reused in various topologies based on H-bridges. This includes the control of the H-bridge resonant converters by pulse frequency modulation so that it is well suitable for the power...
The paper describes methods and techniques of synchronized space-vector pulsewidth modulation (PWM), providing symmetry (quarter-wave symmetry and/or half-wave symmetry) of the output voltage waveforms of modulated voltage source inverters for adjustable speed drives. In this case spectra of symmetrical output voltage of inverters do not contain subharmonics (of the fundamental frequency), which are...
New method of synchronized pulsewidth modulation (PWM) has been disseminated for control of dual neutral-point-clamped inverters feeding asymmetrical dual three-phase (six-phase) motor drive with two DC voltage sources. A novel control strategy for this drive topology is based on variation of switching frequencies of each inverter depending on the magnitudes of voltages of the corresponding DC sources...
Specialized combined schemes of synchronized pulsewidth modulation (PWM) have been applied for control of symmetrical dual three-phase (six-phase) drive on the base of two neutral-point-clamped inverters, providing both common-mode voltage cancellation and continuous synchronization of the output voltage of inverters during the whole control diapason. Simulations give the behaviour of six-phase systems...
The paper presents results of analysis of operation of dual three-phase (six-phase) aeromobile traction drive on the base of two three-phase inverters, supplied by two isolated DC sources with different voltages (Fuel Cells + Battery). A novel control strategy for this drive topology is based on variation of switching frequencies of each inverter depending on the magnitudes of voltages of the corresponding...
Partial Discharge (PD) off- line and on-line measurements are required to prevent early failures on low voltage induction motors fed by inverter drives. Conventional methods use commercial digital scopes to visualize simultaneously the waveform of the applied impulsive voltage and the acquired PD pulses, as well as appropriate solutions to attenuate power electronic voltage impulses. A new approach...
The implementation of complex functionality in low-power nano-CMOS technologies leads to enhance susceptibility to parametric disturbances (environmental, and operation-dependent). The purpose of this paper is to present recent improvements on a methodology to exploit power-supply voltage and temperature variations in order to produce fault-tolerant structural solutions. First, the proposed methodology...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
A circuit for on-chip measurement of long-term jitter, period jitter, and clock skew, is demonstrated. The circuit uses a single latch and a voltage-controlled delay element, and is evaluated in a stand-alone pad frame. Excellent reproduction of jitter measured by oscilloscope is shown. Measured jitter resolution is 1 ps or better. The circuit is also incorporated into a 2 GHz clock distribution network...
This paper presents results of application of a new method of synchronized pulsewidth modulation (PWM) for control of symmetrical six-phase traction drives with two DC sources. The six-phase (dual three-phase) drive system includes in this case a symmetrical induction motor which has two sets of windings spatially shifted by 60 electrical degrees. Analysis of operation of the symmetrical six-phase...
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