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This paper presents a 15-bit ΔΣ ADC with 10kHz-BW which can handle 30V CM voltages with high AC CMRR (in excess of 115dB at 10kHz) while operating from a 1.8 V supply. An HV capacitively-coupled chopper at its input enables the accurate sampling of input signals beyond the supply rails. Chopping is used to mitigate the ADC's offset and to enhance its CMRR, especially at high frequencies.
Presents a low offset current sensing circuit based on switched-capacitor, in which resistance sensing technique is used. Under the control of clock switch, the switched-capacitor integrator could feed the operational amplifier offset voltage back to major circuit as a negative feedback regulator periodically to reduce the influence from the offset to the output. It is shown in the HSPICE simulation...
3-dimensional touch sensing and long battery lifetime are two desired attributes in interactive displays. By employing piezoelectric material and rectifier circuitry related technique, force touch induced charges are used for both force strength detection and energy harvesting, achieving 3dimensional touch sensing and extended battery lifetime at the same time for interactive displays.
An on-chip DC-DC converter for energy harvesting is proposed for a new battery-less solar cell tag applied to the Internet of Things (IoTs) devices. The main purpose of this design is to maximize the transfer efficiency and to stably provide a high enough supply voltage to the back-end loads. The overall circuit consists of a crosscoupled charge pump, a maximum power point tracking (MPPT) circuit,...
This paper investigates nonlinear control methods for single-ended primary-inductor converters (SEPIC). The fast-switching and average models show the converter nonlinearity in terms of inductor currents, capacitor voltages, and the switching duty cycle. The control law intuitively should be nonlinear to drive and guarantee the system stability. Two different control laws based on the passivity and...
Modular multilevel converters (MMC) have many advantages owing to their power-stage modularity. However, this modularity does not extend directly to the control. Particularly, the balancing control usually requires central coordination and increases in complexity with the system size. This paper presents a balancing control method for a more general modular multilevel converter with series and parallel...
In this paper, a new control method for capacitive link universal power converters is proposed to eliminate the need for measuring the output and input voltages. Capacitive link universal converters are a new class of power converters that offer high power density and reliability, and are capable of transferring power between any type of source and load, dc or ac, with any number of phases, emerges...
A battery-free power management circuit (PMC) for an impact-type piezoelectric energy harvester for micro wind is presented in this paper. As the energy generated by micro wind is intermittent, sleep mode is adopted for the PMC to save power. A new energy sensing circuit is designed to detect the energy level generated by the piezoelectric cantilever and then to control the operation modes, sleep...
The main purpose of this paper is to develop a DC voltage controller with AC power ripple compensation for single phase ACDC converter, which is served as the front-end converter for an energy storage system. Due to the single phase ACDC converter circuit topology, the AC and DC side both exist power ripple with doubled grid frequency. In conventional controller, DC voltage is controlled to be a constant...
In this paper, different energy harvesting solutions for an autonomous miniature wireless sensing node are invista-gated. The communication part is realized with Low Power Wide Area Network (LP-WAN) LoRa technology that combine low-power and long range capabilities. Solar, Thermal and Piezo harvesting techniques are compared for autonomous sensing application.
As a step toward sustainable wireless sensing, we present a proof of concept system that uses a Plant Microbial Fuel Cells (PMFC) as a power source. To match the very low power production capabilities of the PMFC, we couple it with an ultra-low power wake-up receiver used as a trigger for sampling and transmission of the sensed value. We demonstrate that this combination, with a new, receiver initiated...
This paper shows the design of a self-powered wireless digital sun sensor (including magnetometer). The information of satellite attitude and magnetic field intensity can be transferred to the attitude determination and control system (ADCS) through Bluetooth. Four solar cells in parallel connection and a super capacitor make sure that the sun sensor can work both in sunshine and shadow areas. The...
This paper proposes a modified sub-module voltage measurement technique for the PSC-PWM modulated modular multilevel converter (MMC) using less voltage sensors. With this technique, the sub-modules per arm are divided into several groups according to their respect carrier phase angles. This arrangement ensures that only one sensor is needed within each divided group. Therefore, the number of sensors...
In this paper, a single-input dual-output rectifier for piezoelectric energy harvesting is proposed. An energy harvester often needs to feed multiple devices. The proposed rectifier provides dual outputs and the number of circuit components in the current path is reduced compared with conventional circuits. Furthermore, with this rectifier, the internal capacitance of the piezoelectric element is...
This paper presents a trimming correction technique to calibrate the offset in capacitive readout circuits of MEMS sensors. The technique relies on a N-bit digital voltage divider which allows to implement an equivalent variable capacitor with sub-femto Farad step variations. To reduce area occupation, a hybrid approach entailing both resistive and capacitor voltage dividers is introduced. Design...
This paper presents a LED driver IC based on a self-resonant Hybrid-Switched Capacitor Converter (H-SCC) operating in the MHz range. Capacitors and switches of the LED driver are integrated on-chip in a low-cost 5V 0.18μm bulk CMOS technology. The effective chip area is 7.5mm2. A conventional SMD output capacitor and a 6.4 mm2 150nH SMD air-core inductor are enough to operate the driver in a compact...
This paper presents a novel architecture for a kilo-ohm to giga-ohm pseudo-resistor (PR), based on transistors operating in subthreshold with a fixed-Vgs configuration. This PR when used in an RC filter has a very low and constant settling time regardless of the programmed pole frequency. The proposed PR takes advantage of bootstrapping to improve its tuning range. By defining a constant VGs for the...
In previous work, the authors proposed an active common-mode filter (ACF) that is able to reduce the radiated noise from power cables connected to power converters and evaluated its radiated noise reduction effect by using an oscillator as a common-mode (CM) noise source. In this paper, this ACF is applied to a motor drive system fed by a PWM inverter, and the attenuation characteristics of the CM...
Series stacking of dc voltage domains to allow power delivery at higher voltages and lower currents has been explored for some time. Differential power processing (DPP) is an integral part of many such applications. DPP benefits from bidirectional converters to process the difference in currents between two consecutive stacked domains to regulate voltages of each domain. In this paper we discuss the...
This paper describes a simple control architecture realized using hybrid feedforward control for a power factor correction (PFC) rectifier based on a four-switch non-inverting buck-boost converter. The converter operates in continuous conduction mode, with smooth transitions between the buck and the boost operations across a line-cycle. To implement the PFC functionality, the controller computes the...
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