Multiple Choice Questions
... (1) Instrument is a device for determining (a) the magnitude of a quantity (b) the physics of a variable (c) either of the above (d) both (a) and (b) (2) Electronic instruments are preferred because they have (a) no indicating part (b) low resistance in parallel circuit (c) very fast response (d) hi ...
... (1) Instrument is a device for determining (a) the magnitude of a quantity (b) the physics of a variable (c) either of the above (d) both (a) and (b) (2) Electronic instruments are preferred because they have (a) no indicating part (b) low resistance in parallel circuit (c) very fast response (d) hi ...
PDF
... Abstract Wind energy has become one of the significant alternative renewable energy resources because of its abundance and the strong drive for its commercialization. Dynamic electric load variations and wind velocity excursions cause excessive changes in the prime mover kinetic energy and the corre ...
... Abstract Wind energy has become one of the significant alternative renewable energy resources because of its abundance and the strong drive for its commercialization. Dynamic electric load variations and wind velocity excursions cause excessive changes in the prime mover kinetic energy and the corre ...
Alternating Current and Voltage
... The maximum voltage is called the peak value. From the graph it is obvious that the peak value would not be a very accurate measure of the voltage available from an alternating supply. In practice the value quoted is the root mean square (r.m.s.) voltage. The r.m.s. value of an alternating voltage o ...
... The maximum voltage is called the peak value. From the graph it is obvious that the peak value would not be a very accurate measure of the voltage available from an alternating supply. In practice the value quoted is the root mean square (r.m.s.) voltage. The r.m.s. value of an alternating voltage o ...
Implementation of Sinusoidal PWM Technique for direct AC
... In all,the progress of the matrix converter has significantly improved its performance, rendering it an acceptable choice for compact and integrated converter-motor drives. Copyright to IJIREEICE ...
... In all,the progress of the matrix converter has significantly improved its performance, rendering it an acceptable choice for compact and integrated converter-motor drives. Copyright to IJIREEICE ...
doc - Design Group
... series with a 300 Ohm current limiting resistor. See the design calculations / considerations for the 244 in the Ship Number Display Board section. Communication with the XBee Pic for Okay to Send and Message Waiting This was a data line only and did not require any special considerations. The only ...
... series with a 300 Ohm current limiting resistor. See the design calculations / considerations for the 244 in the Ship Number Display Board section. Communication with the XBee Pic for Okay to Send and Message Waiting This was a data line only and did not require any special considerations. The only ...
A New Active Power Factor Correcti Power Factor Correction
... Current Mode (CICM-DICM)12. In this way, the freewheeling diode is turned off softly (no recovery losses) and the switch is turned on at zero current, so the commutation losses are reduced. On the other hand the higher current peaks increase device stresses and conduction losses and may call for hea ...
... Current Mode (CICM-DICM)12. In this way, the freewheeling diode is turned off softly (no recovery losses) and the switch is turned on at zero current, so the commutation losses are reduced. On the other hand the higher current peaks increase device stresses and conduction losses and may call for hea ...
BL20-400 - Power Supply and Battery Charging
... From this results a trickle charging voltage of 27 V for a 24 V lead acid battery. In case of higher ambient temperatures, the charging voltages must be reduced following the instructions of the battery manufacturers, whereas in case of external voltage losses they must be increased accordingly. The ...
... From this results a trickle charging voltage of 27 V for a 24 V lead acid battery. In case of higher ambient temperatures, the charging voltages must be reduced following the instructions of the battery manufacturers, whereas in case of external voltage losses they must be increased accordingly. The ...
G9EJ-1-E DC Power Relays
... and immediately ON again, the coil temperature, and consequently the coil resistance, will be higher than usual. This means that the must operate voltage will also be higher than usual, exceeding the rated value ("hot start"). In this case, take the appropriate countermeasures, such as reducing the ...
... and immediately ON again, the coil temperature, and consequently the coil resistance, will be higher than usual. This means that the must operate voltage will also be higher than usual, exceeding the rated value ("hot start"). In this case, take the appropriate countermeasures, such as reducing the ...
goettlicher_peter_20110509
... Galvanic isolation needed for: Definition of GND-point at sensitive frontend Compensation of voltage drop on cable Avoiding currents in the safety GND system Need exactly ONE cable per channel to detector ...
... Galvanic isolation needed for: Definition of GND-point at sensitive frontend Compensation of voltage drop on cable Avoiding currents in the safety GND system Need exactly ONE cable per channel to detector ...
IMPLEMENTING FREQUENCY REGULATION CAPABILITY IN SOLAR PHOTOVOLTAIC POWER PLANTS
... The PV technology, although promising in many aspects, suffers from several drawbacks such as relatively higher cost, low efficiencies, inherent output intermittency and daily ...
... The PV technology, although promising in many aspects, suffers from several drawbacks such as relatively higher cost, low efficiencies, inherent output intermittency and daily ...
The design of a high voltage scr pulse generator for
... significant amount of power and is bulky and quite fragile. In applications such as testing highly attenuative materials where high voltage pulses are required, avalanche transistors” 3 or silicon controlled rectifiers (scr)4, ’ can be used, since they can withstand hundreds of volts (singly or in c ...
... significant amount of power and is bulky and quite fragile. In applications such as testing highly attenuative materials where high voltage pulses are required, avalanche transistors” 3 or silicon controlled rectifiers (scr)4, ’ can be used, since they can withstand hundreds of volts (singly or in c ...
Transformer Rectifier Sets for Electrostatic Precipitators
... metering feedback bushings, terminal board for temperature alarm contacts ...
... metering feedback bushings, terminal board for temperature alarm contacts ...
Lecture 1: Signals & Systems Concepts
... system that transforms the source voltage (signal) to the voltage (signal) across the capacitor – A CD player takes the signal on the CD and transforms it into a signal sent to the loud speaker – A communication system is generally composed of three sub-systems, the transmitter, the channel and the ...
... system that transforms the source voltage (signal) to the voltage (signal) across the capacitor – A CD player takes the signal on the CD and transforms it into a signal sent to the loud speaker – A communication system is generally composed of three sub-systems, the transmitter, the channel and the ...
RV Power Products` Solar Boost™ 50 MPPT PV
... All PV modules have what is known as a maximum power point. The maximum power point is where module voltage times output current equals maximum power. A PV’s maximum power point is constantly changing with module temperature and solar insolation. The MPPT controller tracks that power point as it cha ...
... All PV modules have what is known as a maximum power point. The maximum power point is where module voltage times output current equals maximum power. A PV’s maximum power point is constantly changing with module temperature and solar insolation. The MPPT controller tracks that power point as it cha ...
CMOS Power Dissipation
... when both the NMOS and PMOS are ON and there is a direct path between Vdd and GND • Also called crowbar current • Accounts for more than 20% of total power dissipation • As clock frequency increases transitions increase consequently short circuit power dissipation increases • Can be reduced : – fast ...
... when both the NMOS and PMOS are ON and there is a direct path between Vdd and GND • Also called crowbar current • Accounts for more than 20% of total power dissipation • As clock frequency increases transitions increase consequently short circuit power dissipation increases • Can be reduced : – fast ...
900 MHz RF Transceiver Data Sheet (Rev. 0)
... CMOS synthesizer (Fujitsu MB87006A, Siemens PMB2307, or similar). Logic “1” turns on power to VCO, and divider/prescalers. VBATT connection for regulator. Normally connected to 3.3 V dc or battery. Base connection to external regulator pass transistor (MMBT3906 or similar). Connection for VCO tank c ...
... CMOS synthesizer (Fujitsu MB87006A, Siemens PMB2307, or similar). Logic “1” turns on power to VCO, and divider/prescalers. VBATT connection for regulator. Normally connected to 3.3 V dc or battery. Base connection to external regulator pass transistor (MMBT3906 or similar). Connection for VCO tank c ...
Pulse-width modulation
Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being MPPT.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible. Typically switching has to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on.The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel.