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 provides a novel voltage space vector modulation algorithm dedicated to the inverter fault-tolerant motor drive systems based on the four-switch inverter topology. The proposed technique ensures an accurate phase voltage modulation even under a DC-link voltage imbalance. Moreover, the capacitor voltages of the DC-link are leveled up so that the simultaneous motor drive operation is obtained...
A low-dropout regulator (LDO) with 800 mA load current with wide range input voltage is designed and proposed in this paper. The designed LDO includes two cascaded LDOs. The first one uses a p-type of DMOS power transistor to convert a wide input voltage (3.9 to 20 V) to a stable output voltage of 3 V, which provides a supply voltage for other circuits. The second LDO is designed to achieve a large...
A Li-ion battery charger with dual input source capability and high efficiency is proposed in this work. An internal source determination circuit could choose the sufficient energy source for charging system. Also, a new approach of smooth transition to avoid oscillation between charging mode switching is used through current-mode-like smooth transition circuit. Pulse frequency modulation with adaptive...
In this paper the transistor open-circuit fault diagnosis strategy based on the converter voltage estimation error in the voltage oriented controlled three-phase two-level AC/DC lineside converter was presented. In accordance with the developed method, for the converter voltage estimation, the signals of the duty cycles of the voltage modulator as well as simple calculations, that use the line-to-line...
Bandgap voltage is typically used as the reference voltage of voltage regulators, such as dc-dc converters. Two high-precision CMOS bandgap reference circuits, labeled as current-mode and voltage-mode bandgap circuits, are proposed. The voltage-mode bandgap circuit can work with the supply voltage ranging from 2.5 V to 5V, while the current-mode bandgap works from 1.8 V to 5V. Both of them were designed...
Acapacitor-less low drop-out linear regulator with a new compensation technique is presented. A conventional LDO suffers intrinsic stability problem at low load currents and require a large offchip capacitor to make LDO stable. This off-chip capacitor occupies large area in the chip and thus not ideal for SoC applications. Many LDO architectures have been proposed recently but still some of them requires...
This paper provides an open switch fault diagnosis method for a voltage oriented controlled AC/DC line side converter. The technique is based on rectifier phase voltage errors calculations. For the faulted transistors localization, the average voltage errors of the rectifier are computed and their values and signs are analyzed. The proposed method is valid under the rectifier as well as the regenerative...
In this paper the transistor open-circuit fault diagnostic technique that is based on the grid current prediction in the voltage oriented controlled three-phase two-level rectifier was discussed. For the current one-step prediction, the rectifier's dynamics equation was discretized using the Euler's method. The proposed technique allows to detect single and multiple transistor faults under the rectifying...
In this paper, an analog voltage based maximum power point tracking (MPPT) algorithm for individual photovoltaic (PV) panel is proposed. The fixed voltage reference method is the simplest method for tracking, but it does not give good MPPT efficiency because the MPP voltage point changes at different solar insolation levels. A roughly linear slope is formed when connecting the MPP points measured...
This paper presents a half-bridge driver to fulfill the requirement for interfacing with MEMs sensors. The upper switch of the driver is implemented by a p-type power transistor to make the driver feasible for pulse density modulated input signal. The high-side “ground” reference voltage VSSH is regulated through the proposed charge pump circuit, which harvests the charges flowing into the VSSH node...
Zigbee wireless sensor network is widely used in telemonitoring systems, one of which is telemonitoring system for environments. The sensor nodes are placed in areas in which power source are not available. Hence, a system that can supply the energy use of energy resources available in the environment is required. This paper shows the solar power supply design for a node in ZigBee wireless sensor...
Bio-medical wearable devices restricted to their small-capacity embedded-battery require energy-efficiency of the highest order. However, minimum-energy point (MEP) at sub-threshold voltages is unattainable with SRAM memory, which fails to hold below 0.3V because of its vanishing noise margins. This paper examines minimum-energy operation of 2T and 3T1D e-DRAM gain cells as an alternative to SRAM...
This paper presents a 0.65-V flipped voltage follower (FVF)-based regulator with an embedded sub-1-V voltage reference. A low-pass filter is employed in the current coupling path to reduce the bias noise and improve the power supply rejection (PSR) at a low-frequency band (<kHz). The chip is fabricated in a 0.18-μm CMOS process and occupies an active area of 0.076 mm2. The proposed FVF regulator...
This paper presents the design of a high-voltage (HV) rail-to-rail error amplifier. This circuit controls the output signal of a low drop-out voltage regulator (LDO) according to the reference voltages and based on stacked standard transistors. The circuit is designed using 65 nm CMOS process technology with a nominal voltage of 2.5 V and is optimized for arbitrary values of supply voltage up to 5...
This paper presents a high-voltage (HV) driver for switching a buck converter. The circuit is based on 3-stacked CMOS using gate control circuits to drive maximum current which indicates minimized on-resistance of the HV-driver thus achieving faster switching. The circuit is designed and fabricated using 65 nm CMOS TSMC process technology with a nominal voltage of 2.5 V and with a supply voltage of...
In this paper the algorithm for battery charge control of renewable energy sources — wind turbine and solar panel. Every operating block is also described with specifying the dependencies. The principle of the charging current limitation that prevents battery failure as a result of a strong internal resistance increase while preliminary deep discharge is considered.
Paper includes efficiency change test results from standardized power supply depending on input voltage and efficiency tests of transformer based voltage regulator with different loads. Approximately is calculated necessary efficiency of voltage regulator to be used with power supply. THD analysis is done of output voltage signal, harmonic content has been measured as well. Brief explanation of possible...
A circuit called prectulator is proposed in this paper. It utilizes the output transistor (Mpr) of a linear regulator also as a passive rectifier for providing a regulated DC output from an AC input. The bulk voltage and the gate voltage (Vg) of Mpr are biased by an auxiliary rectifier and an error amplifier (Ae), respectively. During startup and overload situations, overdriving Mpr may occur and...
Ten different modulation methods of the isolated quasi Z-source inverter based DC-DC converter were tested to find out radiated emission levels. EMC measurements were performed on a low power 250 W prototype. A radiated emission test was carried out in a GTEM cell (gigahertz transverse electromagnetic cell) according to the EMC standard IEC 61000-4-20. To obtain a complete overview of the emissions,...
Three key requirements for wearable healthcare and biomedicai devices are the mechanical flexibility, the wireless interface, and the energy autonomy, because unobtrusive and maintenance-free devices are needed for the constant monitoring of vital human health data. Previously reported flexible healthcare and biomedicai devices, however, requires wired connection [1,2] or wireless power transmission...
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.