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This paper introduces an enhanced speed self-sensing method that tracks stator flux linkage in electric machines at very low speeds. Volt-second sensing technology is used to mitigate the inverter nonlinearity, which is the major source of flux estimation error in the very low speed range. By integrating volt-second sensing in the Gopinath style closed-loop flux observer, the rotor speed information...
An original and modern integrated current sensor is designed and presented in this paper. It can provide a sense current proportional to an output current available to the microcontroller via an external resistor. The ratio between output and sense current is modeled and simulated. The errors between the two currents increase in low currents domain. A solution consisting in a gate back regulation...
The article considers multichannel integrated circuits (ICs) MH2XA010-02/03, which are realized on the radiation-hardened structured array (SA) MH2XA010 and designed for analog signal processing of optoelectronic sensors. It gives the electric circuits of ICs, the description of their functionality features and the measurement results of their main parameters.
This paper describes the concept of the dynamic duty-cycle limiter of the boost dc-dc converter. Duty-cycle limitation in boost converters is usually used to protect the bottom switch against an excessive current, and also to avoid instability occurring at high duty-cycle operations. Compared to fixed limitation, dynamic limiter enables to detect and maintain maximal possible output voltage VMAX,...
This paper presents a study of Operational Transconductance Amplifiers (OTAs) for voltage to current conversion circuits. The paper includes a comparative analysis of three OTA architectures implemented in 0.35µm CMOS AMS Technology under ± 1.65V power supply voltage. The impact of the OTA topology has been investigated by simulation. The designed OTAs managed to deliver large current values of 10mA...
Droop control is used in dc micro-grids to share load among multiple sources but practical factors deteriorates the performance. In this paper, the impact from cable resistance and voltage regulation error is analyzed. Cable resistance introduces extra output resistance thus changes the load sharing ratio while voltage error introduces a constant current deviation. To suppress the sharing unbalance...
This work proposes the use of inductive links in order to wirelessly power autonomous sensors. In order to increase the powering distance and the power efficiency, resonant tanks were considered. To drive the transmitting resonant network, a commercial class D amplifier was used. Working frequency was restricted to 150 kHz. Commercial magnetic-core coils were selected as they provide high coil values...
Monolithic power management integrated circuit chips are widely used in both consumer products and industrial products. In some applications the load changes drastically. A 2MHz integrated synchronous Buck converter is designed to manage the dynamic load for these applications. The current mode control and active voltage positioning are employed to achieve high transient performance at pulse load...
Adaptive voltage positioning (AVP) has been used in DC-DC switching power converters for powering integrated circuits due to its advantages of utilizing allowable output voltage tolerance while decreasing the output filter capacitance requirement, and achieving faster transient response. Most of the AVP control schemes in the published literature require current sensing and sampling circuits which...
This paper describes a current sharing technique for digitally controlled multiphase buck DC-DC converters. The effective duty cycle mismatches and resistance mismatches are digitally compensated to achieve equal current sharing without sensing currents. Effects of various non-idealities on the current sharing performance are discussed. Experimental results are shown for a four-phase synchronous buck...
It is very important to identify the electrical parameters accurately for the servo system of PM motor, that keep the fine torque response and the fine speed response. Generally, the electrical parameters of PM motor are identified by using the motor voltage and motor current. However, current sensor often has the offset value. In this case, the servo system of PM motor has the torque ripple and can...
The power distribution equipment, the key equipment in certain unmanned aerial vehicle (UAV), is in charge of the power distribution management and the signal conversion of airborne sensors, and must be comprehensively tested before the trial flight of UAV to ensure the flight safety. The automatic test method for the equipment is researched and an automatic test system is developed to meet the test...
The main aim of this paper is the analysis and experimental evaluation of the performance of a photovoltaic power plant controlled by a dedicated algorithm. This is devoted to the search of the maximum power point during the energy conversion of the photovoltaic panels. The proposed approach uses a control strategy that does not requires the current sensing, which is a main cause of noises, errors...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
The real time monitoring and control of resistance spot welds is a problem of critical importance in automotive and many other manufacturing industries. However, till this date, there are no reliable, low-cost, non-destructive techniques for predicting the size and strength of the weld nuggets in real time. This paper investigates the usage of voltage, current, and force data for the above tasks....
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