The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper explains a current sensing technique suitable for digital controller implementation. The technique uses only one analog comparator to estimate the DC as well as ripple of the inductor current of a regulated DC-DC converter. For systems where input voltage variation is anticipated, a low speed ADC can be used to take care of the variation in input voltage for inductor current estimation...
This paper proposes a high step-up, transformerless, dc/dc converter suitable for applications where high efficiency at low power throughput is required. The proposed converter achieves high step-up dc/dc conversion through a resonant LC tank and realizes high-efficiency operation via the softswitching enabled by this resonant network. Flat efficiency is obtained via discontinuous conduction mode...
Power factor correction (PFC) converter consumes a large part of volume of power supply. Typical switching frequency of commercial PFC converter is usually not higher than several hundred kHz. Increasing the switching frequency of PFC converter to MHz by using GaN devices can greatly reduce the size and increase power density of power supply. In order to eliminate the high turn-on loss of cascode...
In this paper, the operating modes of the bidirectional CLLLC resonant converter are analyzed in time domain to determine the steady-state operating point. The operating mode boundaries, mode transitions and mode distribution are discussed and the dependencies of modes on voltage transfer ratio, inductor ratio and switching frequency are illustrated. Based on the mode analysis results, normalized...
In recent years, interest in the application of the Power Factor Corrector has grown considerably. This paper gives a comprehensive account of Critical Conduction Mode (CrM) in the Power Factor Corrector. The Critical Conduction Mode technique is newer than Continuous Conduction Mode (CCM). The analysis shows the principle which are based on structural schema and mathematical description of the waveforms...
This paper discusses the dependence of efficiency on the switching frequency of a Single Ended Primary Inductor Converter (SEPIC), for use in photovoltaic (PV) maximum power point tracking (MPPT) applications. An MPPT system comprises of a DC/DC converter and tracking algorithm set to run the PV at its maximum power point. The SEPIC is a non-inverting DC/DC converter able to output a voltage greater...
Series connected battery cells can use balancing circuits so that each individual cell has the same state of charge (SOC) as the others. In this paper series-loaded resonant (SLR) converters are used to trickle charge individual cells to accomplish this charge equalization goal and increase the reliability of the battery pack. Analytical equations are used to support the design of an SLR converter...
A diode-clamped three-level dual-boost reversible PWM rectifier is proposed in this paper. As this topology is deduced from the dual-boost PWM rectifier, it inherits the merits of no hidden danger of shoot-through and no body diodes' reverse recovery problems, which are the two main problems of the conventional half-bridge and full-bridge rectifiers. Thus, the proposed circuit has the advantages of...
Voltage regulator modules (VRMs) have to maintain perfect current sharing between modules in both static and dynamic loading. In this study, sliding mode control was applied to both the voltage loop and the current share loop of the two-phase VRM with the aim of providing an effective current sharing scheme. Unlike other sliding mode control implementation that uses infinite switching frequency in...
The purpose of this paper is to present a new digital control boundary current mode buck-boost dc-dc converter. This buck boost dc-dc converter is intended for use as the low power converters, such as solar and wind power generation. The buck-boost dc-dc converter is widely used in the energy management field, because it has capability to obtain the wide input range characteristic. Moreover, the circuit...
This paper proposes a systematic approach to design the output filter of a 10 kW, low-voltage 400 Vll,rms, fouroutput phase, hard-switched AC source based on the Three-Level Neutral Point Clamped Voltage Source Converter topology. Given specifications of the AC source, such as the voltage quality, the control performance or the conducted EMI at the output of the source, are translated into corresponding...
The analytical expressions for boost converter loss are presented in this paper. All significant sources of conduction and dynamic losses within the converter elements, including losses in choke magnetic material and switching losses which occur due to diode recovery time, are discussed. Sources of losses in continuous and discontinuous current mode of converter are examined. The equivalent input...
Because switching frequency of the fixed band hysteresis current controller varies greatly, it is more difficult to design the output filter. Although variable band hysteresis control can achieve fixed switching frequency, it requires more processor resources when it is actualized by software. This paper analyzes the changing patterns of switching frequency by transient current equation, and replaces...
This paper presents the analysis and design of the full-bridge (FB) LC parallel resonant plasma driver at the radio-frequency (RF) operation with variable-inductor based phase control scheme. Since the switching frequency of the RF plasma module is mainly fixed at 13.56MHz for EMC regulation, the variable-inductor control scheme can adjust the transconductance amplitude to enable load-current regulation...
A new interleaved three-level inverter with reduced ripple current of filter inductor is proposed. This inverter consists of six power switches, including two interleaved power switches at the top location and the bottom location separately, and two double frequency power switches at the middle locations. The inverter theory and PWM method are explained. The ripple current expression equations of...
A current-fed DC-DC converter with zero-current switching (ZCS) is presented in this paper. The front stage, which is a DC-DC buck converter, is used to regulate the output voltage by utilizing pulse-width modulation. The rear stage, which is a push-pull DC-DC converter by using the current-fed technique, is used to transfer energy from low voltage side to high voltage side for high voltage applications...
This paper presents a method for power loss analysis applied on single-phase grid-connected PV inverter. The often neglected current ripple effects are included in power device switching and conduction losses. The relationships amongst component losses, output inductance, switching frequency and dc-link voltage are investigated. It is shown that current ripple effect is important to power loss analysis...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.