Less-conventional low-consumption galvanic separated MOSFET-IGBT gate drive supply

A simple half-bridge, galvanic separated power supply which can be short circuit proof is proposed for gate driver local supplies. The supply is made while hacking a common mode type filter as a transformer, as the transformer shows a good insulation, it has a very low parasitic capacitance between primary and secondary coils, and it is cost-effective. Very low standby losses were observed during lab experiments. This makes it compatible with energy efficient drives and solar inverters

Addressing Overvoltage Protection for High Voltage Loads

In most of the electrical systems mainly the damage is caused by overvoltage and excess current. This paper addresses the methods and issues related with the overvoltage protection for high voltage loads. If the voltage exceeds beyond the withstanding voltage capacity of the device it may damage it. The design and development of primary and secondary protection circuits are described. This includes use of IC MPS2400 for protecting the loads from damage due to overvoltage. This overvoltage protection controller is used with an external N-channel MOSFET to isolate the sensitive loads from destructive voltage spikes and surges. The Gate output voltage and Gate sourcing current are measured. Output Turn on response and Output turn off response are characterized. Results are discussed

Development of a Sensor Readout Integrated Circuit Towards a Contact Lens for Wireless Intraocular Pressure Monitoring

This design covers the design of an integrated circuit (IC) in support of the active contact lens project at Cal Poly. The project aims to monitor intraocular eye pressure (IOP) to help diagnose and treat glaucoma, which is expected affect 6.3 million Americans by 2050. The IC is designed using IBM’s 130 nm 8RF process, is powered by an on-lens thin film 3.8 V rechargeable battery, and will be fabricated at no cost through MOSIS. The IC features a low-power linear regulator that powers a current-starved voltage-controlled oscillator (CSVCO) used for establishing a backscatter communication link. Additional circuitry is included to regulate power to and from the battery. An undervoltage lockout circuit protects the battery from deep discharge damage. When recharging, a rectifier and a voltage regulator provides overvoltage protection. These circuit blocks are biased primarily using a 696 mV subthreshold voltage reference that consumes 110.5 nA

Testing of MEMS gyroscopes

Tato diplomová práce se zabývá teoretickými poznatky o konstrukcích a parametrech MEMS gyroskopů. Dále je prezentován navržený měřicí řetězec pro testování MEMS gyroskopů ve společnosti Honeywell International s.r.o. a to zejména s použitím systémů: Polytec MSA-500, goniometrických plošin a kontroléru od firmy Standa a kontroléru pro řízení Peltierových článků. Praktická část diplomové práce obsahuje popis navrženého kontroléru pro řízení teploty testovaného zařízení a také popis aplikace v prostředí LabVIEW („Measurement systém“), která se používá pro řízení pozice dvou goniometrických plošin a pro řízení Peltierových článků. Tento systém je schopen plně řídit pozici goniometrických plošin, zarovnat povrch testovaného zařízení do ideálně kolmé pozice vůči optické hlavě analyzátoru Polytec MSA-500 a také kontrolovat teplotu testovaného zařízení. Závěrečná část diplomové práce je věnována testům základních parametrů MEMS gyroskopů se zaměřením na závislost tzv. Angle Random Walk a offsetu MEMS gyroskopu na kvalitě vakua v prostředí struktury.This diploma thesis presents theoretical information regarding MEMS gyroscopes their parameters and designs. The description of measurement chain be used for testing of MEMS gyroscopes in Honeywell International s.r.o. is presented. Special focus is devoted to: the Polytec MSA-500 system, the Standa goniometers and their controller, Peltier cell and its driver. The practical part of this thesis contains the description of the thermal control system and also the description of the developed “Measurement system” in the LabVIEW software which is used for controlling the goniometers position and the Peltier cell. The system is able to fully control two goniometer stages, align the surface of tested MEMS device to orthogonal position with respect to the Polytec MSA-500 measurement head and also control the temperature of the tested device. The last part of this thesis presents the tests of the MEMS gyroscope parameters with special focus to the MEMS gyroscope angle random walk and the bias dependence on the vacuum quality of the structure environment.

Improvements to a Bi-directional Flyback DC-DC Converter for Battery System of the DC House Project

The DC House project relies primarily on renewable energy sources to provide DC power to the various loads of the house. However, not all renewable sources are capable of providing power at all times of the day. A back-up energy source in the form of a battery storage system must be available to meet the electrical needs of the house. A bi-directional flyback power converter was initially designed to allow a battery to charge from as well as discharge to the 48V bus line of the DC House. The design provided a 35W prototype to demonstrate the converter’s feasibility. Further improvements to increase power output through changes in design as well as improving the control scheme of the bi-directional converter were conducted. Results allowed an increase of output power to 48W with efficiency at 82% for both charging and discharging. The improvements to the control scheme allowed for better management of charging and discharging cycles of the battery

KONTROL PID PADA SISTEM KENDALIMOTOR SERVO PENGGERAK ROBOT BERJARI

Nowadays, in the industry sector, there were many professions in contact with fingers in line with this phenomeon there were any risks caused by those professions, to prevent this problem bionic finger robot was developed. Bionic robot finger was a robot which had appearance like the hand of human, had 5 fingers as the real fingers. It was designed by set up five servo motors to move the 5 of fingers’ robot and 5 flex sensors in the gloves. If flex sensor in the gloves moved, the information would be sent to Arduino Uno to be processed and sent to servomotor. Bigger curvature we gave to the flex sensorbigger resistance value we got. Controlling of robot finger did by using Bluetooth HC-05 module. The voltage of these systems came out from power supply. The balance of design between mechanic and electronic was needed to give maximal performance

Cell Phone Charger for the DC House Project

The goal of this project is to create a multiple output cell phone charger for the DC House project. The cell phone charger is essentially a DC-DC converter. The converter takes an input of 48 volts from the outlet in the DC House and decreases the voltage level to 5 volts; the input voltage level of all cellular devices. By designing an isolated flyback converter with initial specification in LTSpice simulation software, a converter was created. By monitoring the input and output voltage and current using the multi-meters and electronic load, we determined the charger to be 71% efficient when both outputs were running at a full load of 1 ampere. Using the same equipment the load and line regulations were determined. Output one had a load regulation of 1.35% and a line regulation of 0.34%. Output two had a load regulation of 2.02% and a line regulation of 0.3%. By viewing each output on the oscilloscope, we determined the voltage ripple of each output to be 3.45% and 4.42%. With these results, we know we have created a quality and affordable multiple output cell phone charger

The Little Probe That Could! (A Story of Mission Impossible Engineering)

Starting with the Space Shuttle flight 4A (Nov. 30, 2000), the International Space Station (ISS) power system employs large, high voltage, solar arrays with the negative ground tied to chassis. An intense study by a NASA sponsored Tiger Team in the early ‘90s determined that this configuration leads to the structure being at a high negative potential relative to the local plasma (approximately 140v negative without any intervention) and, that at any potential greater than around 70v negative, the anodized aluminum structure and its components will undergo destructive arcing. A set of plasma contactor units (PCUs) was deployed to provide a conductive xenon plasma path for remitting electrons collected by the arrays and thus bring the potential closer to zero and mitigate the arcing danger. In late July 2000, the ISS program office at JSC issued an engineering change notice that directed the development of some means to independently assess the performance of the PCU’s, and to have hardware available for launch on STS-97 (ISS Flight 4A) the very mission scheduled to deliver and install the first set of large Station solar arrays on November 30th. This allowed only a mere 4.5 months to design, build, test, manifest, complete EVA training, and deliver for launch. NASA Glenn, NASA Johnson, and Design_Net Engineering formed a unique team to try to accomplish the directive. The subject of this paper is to describe the Floating Potential Probe (FPP) and the fast-track program approach used to quickly develop this autonomous system for measuring the electrical potential between the ISS and the surrounding space plasma. At the time, most people involved with the Floating Potential Probe (FPP) project believed that there was less than a 10% chance of successfully making it onboard Flight 4A and even less chance that it would work

I MHz PWM Generation Using Intersective Method

This project serves as a basis to investigate the performance of a PWM generator circuit. This is due to available PWM generation method cannot cover a wide operation frequency and wide duty cycle range. PWM signal had been used in various application including power system, communication and control systems. Pulse-width modulation (PWM) is a very efficient way of providing intermediate amounts of electrical power between fully on and fully off

Design of temperature sensor power suply using TEG

Tato práce se zabývá návrhem a sestrojením elektrického zařízení, které by umožnilo napájení snímače teploty na rotujících částech elektrického stroje. Jedná se o využití termoelektrického generátoru (TEG).This thesis describes the design and construction of a device that would allow power supply the sensors on rotating parts of the machine. We use thermoelectric generators (TEG).