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A 0.18 μm CMOS Low-Dropout (LDO) Voltage Regulator is proposed in this paper for battery-operated measurement systems. With a quiescent current of only 7 μA, it supplies a 1.8 V output voltage from a 3.6 V to 1.9 V battery input voltage, featuring a line regulation of 0.00647 mV/V and a load regulation of 0.0024 mV/mA for a load current of 50 mA over a 100 pF load. Further, thanks to the use of a...
In this paper, a 13.56 MHz regulated dual-output active rectifier is proposed for implantable medical devices (IMDs). By adopting the pulse-width modulation (PWM) to control the conduction time of the rectifying switches, the proposed active rectifier is able to realize the rectification and regulation of dual-output voltages without adding DC-DC converters. The proposed automatic digital offset compensation...
Aiming at the complicated control problem of the existing inductively coupled power transfer system, a self-oscillating control method for the push-pull resonant converter with parallel-series compensation is proposed. The necessity of designing the start-up circuit is explained by illustrating the principle of self-oscillating control. Based on the analysis of the energy transfer mechanism of the...
A research of process, voltage and temperature variation influence on PLL system and stabilization methodology of VCO's control voltage is shown. PLL control voltage stabilization methodology provides robust mechanism to stabilize PLL's control voltage and decrease power consumption. Proposed stabilization principle was realized by excluding leakage current of a MOSFET capacitor which is caused by...
This paper presents a control scheme of a three-phase three-switch unidirectional delta-type rectifier, using a modification of discontinuous two-level space vector modulation (2L-SVM) strategy based on Vienna rectifier. The proposed arrange method was created, in order to procreate the discontinuous gate-drive signals for each power switch on the basis of five-segment switching sequence. For this...
In this paper, a single phase effective closed loop control for solar inverter is proposed. As solar irradiance level changes with atmospheric conditions, output of the inverter varies. To maintain the output voltage of the inverter constant a close loop is implemented using PWM technique. A PWM signal is generated by comparing the output of PI controller with two identical triangular signals having...
The design of PWM/PFM controller for SMPS is explained in this paper. An application concerning logic controller to manage is given. controller used here is Pulse frequency modulation (PFM)and pulse width modulation(PWM). In general for light load pulse width modulated buck converter operates with high efficiency since it has less switching losses, for heavy load operation pulse frequency modulation...
Leakage power dissipation is drastically increasing with the scaling of the each new technology node. The number of gates per chip has increased for improving the performance of the circuits, rise in operating frequency and many more has resulted in greater leakage power dissipation. That demands low power integrated circuits (ICs). In this paper, bootstrapping technique has been used so as to overcome...
This paper presents about the designing of the controller for integrated Buck Buck-Boost converter for maintaining the constant DC output voltage. This constant output voltage can be used for low voltage application. The absence of transformer includes the advantages of losses is less, efficient power factor and high efficiency. It provides the simple control structure with the positive constant output...
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...
Back to back (B2B) voltage source converter is used for HVDC system and ac drive system to control active-reactive power. In this paper reduced switch back to back converter is used for induction motor drive system which is operated in unity as well as leading power factor. Active and reactive power flow are independently controlled. The active power transfer is controlled by angle delta; where delta...
Owing to the need for low power consumption, portable and wearable electronics operate at low voltages, typically below 1V, with recent designs in near- and subthreshold operation resulting in voltages down to 0.3 to 0.5V. Meanwhile, voltage range of the most common energy source - the Li-ion battery - is 3 to 4.2V, motivating the need for compact power converters capable of large conversion ratio...
Energy harvesting (EH) is a topic of intensive research promising battery-free operation of massive networks of wireless IoT devices. To simultaneously satisfy the EH and IoT, ultra-low-power (ULP) consumption with ultra-low-voltage (ULV) supply are required. Some, e.g., photovoltaic, EH output voltage (<0.3V) is below the threshold voltage (Vt) of even the most recent FinFET CMOS transistors,...
The numerous limitations of Electro Mechanical Relays (EMRs) for implementing Single-Pole, Single-Throw (SPST) Bi-Directional Switches (BDS) lead to new developments based on power semiconductor devices. This work gives an insight into the design and operation of BDSs based on the combination of unidirectional voltage blocking and bidirectional current conduction power devices, which aim to substitute...
Control of a three-phase inverter with neutral-line voltage injection is proposed to improve the output voltage waveform. This inverter consists of a main three-phase inverter and an auxiliary single-phase inverter; the main inverter acts in the 120-degree conduction mode and the auxiliary inverter behaves as a wave shaper with three times frequency of the main frequency. The main inverter converts...
This paper deals with a comprehensive study and comparison on the conventional linear-assisted converter and a new structure named, LDO-assisted converter based on a new class-AB LDO regulator instead of the conventional linear one, in terms of efficiency, output ripple, and load transient response. The new structure reduces difference between input and output voltages and also switching frequency...
An adaptive inverter-based dead-time controller for synchronous DC-DC converter is proposed. With this controller, the switching time is precisely controlled and thus simultaneously eliminates the power losses caused by body-diode conduction, power-stage shoot-through current and inductor reverse current. A pair of inverters are used to replace the high speed comparators in this controller for even...
This paper presents a 2/3 step-down switched-capacitor DC-DC converter with integrated NMOS-LDOs in both charging and discharging phases to suppress the output voltage ripple. A gate driving technique implementing adaptive gate slope and gate pre-charge is proposed to reduce the switching noise during phase transitions and assist the turn-on of the regulation transistors, respectively. Good load regulation...
Increasing the channel width of an IGBT is an obvious method in order to decrease the on-state losses significantly due to the lower Vce,sat-value. The accordingly higher desaturation current leads to the development of faster short circuit detection methods, such as the new 2D — short circuit detection method, which is able to detect a fault event far ahead of the desaturation process of the power...
In radio-frequency receivers, variable-gain amplifiers (VGAs) are often used in order to compensate for the change of the signal level during the channel transmission and to relax the constraints on the succeeding analog-to-digital converter (ADC). In this paper, a novel VGA is introduced using a floating-gate MOS transistor (FGMOS). The voltage gain, the linearity, the valid region for proper operation,...
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