a novel integrated power quality controller for microgrid
... transformer with air gap is selected, and the primary winding current of the transformer is detected. A voltage-sourced inverter is applied to follow the primary current to produce another current, which is injected to the secondary. When the injected current is adjusted, the equivalent impedance of ...
... transformer with air gap is selected, and the primary winding current of the transformer is detected. A voltage-sourced inverter is applied to follow the primary current to produce another current, which is injected to the secondary. When the injected current is adjusted, the equivalent impedance of ...
A/D and D/A - University of Detroit Mercy
... • A/D converters have specific upper and lower voltage ranges. Typical values used are 0-10V or -10 to 10 V. • If the input signal is higher than the upper limit or lower than the lower limit the converter saturates. This can be prevented by appropriate signal conditioning. ...
... • A/D converters have specific upper and lower voltage ranges. Typical values used are 0-10V or -10 to 10 V. • If the input signal is higher than the upper limit or lower than the lower limit the converter saturates. This can be prevented by appropriate signal conditioning. ...
Towards a Portuguese participation in the European Spallation
... - A 3-phase transformer, with multiple (N) secondary winding systems, feeds N isolated capacitor chargers; - DC/DC converters are supplied by the capacitor banks and generate a variable DC voltage at their outputs, however with high HF contents; - The output of all the DC/DC converters are connected ...
... - A 3-phase transformer, with multiple (N) secondary winding systems, feeds N isolated capacitor chargers; - DC/DC converters are supplied by the capacitor banks and generate a variable DC voltage at their outputs, however with high HF contents; - The output of all the DC/DC converters are connected ...
Versatile Waveform Generator Operates from 0.1Hz to 20MHz
... Figure 11. This circuit modulates a 10MHz carrier with 10kHz, and then recovers the modulating signal. The internal phase detector can also demodulate frequency-modulated signals (Figure 11). In this circuit, the output of one MAX038 is being frequency modulated with a 10kHz sine wave. The ±34mV si ...
... Figure 11. This circuit modulates a 10MHz carrier with 10kHz, and then recovers the modulating signal. The internal phase detector can also demodulate frequency-modulated signals (Figure 11). In this circuit, the output of one MAX038 is being frequency modulated with a 10kHz sine wave. The ±34mV si ...
4 l General information 12 l Single
... 3*) European regulations often require an earthed neutral conductor N. If one considers the star point of the autotransformer in the delta grid there is a direct (and devastating) short circuit either through the PE conductor via L3 to N on the winding ‘2V’ or via ‘2V’ and the earthed ‘1V’. 4*) Cons ...
... 3*) European regulations often require an earthed neutral conductor N. If one considers the star point of the autotransformer in the delta grid there is a direct (and devastating) short circuit either through the PE conductor via L3 to N on the winding ‘2V’ or via ‘2V’ and the earthed ‘1V’. 4*) Cons ...
MC13783 Switcher Settings to Optimize +/
... and video bandwidth of 30 kHz from 100 kHz to 1800 kHz below and above the carrier, with averaging done over 50% to 90% of the useful part of the burst (excluding midamble) and then averaged over 50 or 200 such burst measurements. The switching spectrum is measured at the spectrum analyzer with zero ...
... and video bandwidth of 30 kHz from 100 kHz to 1800 kHz below and above the carrier, with averaging done over 50% to 90% of the useful part of the burst (excluding midamble) and then averaged over 50 or 200 such burst measurements. The switching spectrum is measured at the spectrum analyzer with zero ...
RTCA SC-135 and EUROCAE WG-14
... directly to the designated pins of the EUT connector, usually between each pin and case ground. This method is used for assessing the dielectric withstand voltage or damage tolerance of equipment interface circuits. a. A dielectric withstand voltage or high potential (hi-pot) test may be used in lie ...
... directly to the designated pins of the EUT connector, usually between each pin and case ground. This method is used for assessing the dielectric withstand voltage or damage tolerance of equipment interface circuits. a. A dielectric withstand voltage or high potential (hi-pot) test may be used in lie ...
Lecture Notes
... A Square-law modulator requires three features: a means of summing the carrier and modulating waves, a nonlinear element, and a band pass filter for extracting the desired modulation products. Semi-conductor diodes and transistors are the most common nonlinear devices used for implementing square l ...
... A Square-law modulator requires three features: a means of summing the carrier and modulating waves, a nonlinear element, and a band pass filter for extracting the desired modulation products. Semi-conductor diodes and transistors are the most common nonlinear devices used for implementing square l ...
Monjolo: An Energy-Harvesting Energy Meter Architecture
... Existing commercial meters are expensive and hard to install ...
... Existing commercial meters are expensive and hard to install ...
Open circuit test
... excitation branch. Thus the wattmeter measures only the iron loss. Since the secondary of the transformer is open, the primary draws only no load current. This no load current is negligible. As the copper losses depend on current they can be neglected. Current, voltage and power are measured at the ...
... excitation branch. Thus the wattmeter measures only the iron loss. Since the secondary of the transformer is open, the primary draws only no load current. This no load current is negligible. As the copper losses depend on current they can be neglected. Current, voltage and power are measured at the ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
... reuse of their switching frequency. Consequently, the delivered trapezoidal voltage pulses reach considerably high values of dv/dt (often more than 10 kv/μs). Situated in a system consisting of the PWM inverter, feeding cable and induction motor (IM) is then strongly influenced by its leakage capaci ...
... reuse of their switching frequency. Consequently, the delivered trapezoidal voltage pulses reach considerably high values of dv/dt (often more than 10 kv/μs). Situated in a system consisting of the PWM inverter, feeding cable and induction motor (IM) is then strongly influenced by its leakage capaci ...
A Cuk converter for VSI-fed BLDC motor drive has been
... The BLDC motor is a three-phase synchronous motor consisting of a stator having a three-phase concentrated windings and a rotor having permanent magnets. It does not have mechanical brushes and commutator assembly; hence, wear and tear of the brushes and sparking issues as in case of conventional dc ...
... The BLDC motor is a three-phase synchronous motor consisting of a stator having a three-phase concentrated windings and a rotor having permanent magnets. It does not have mechanical brushes and commutator assembly; hence, wear and tear of the brushes and sparking issues as in case of conventional dc ...
G. Escobar, A.M. Stankovic, and D.J. Perreault, “Regulation and Compensation of Source Harmonics for the Boost-Converter Based Power Factor Precompensator,” 2001 IEEE Power Electronics Specialists Conference , Vancouver, Canada, June 2001, pp. 539-544.
... source will see the controlled system as the same equivalent resistor at each harmonic frequency. Our solution considers the main parameters of the system (the capacitance and the inductance) and of the applied load as unknowns; we also allow for harmonics in the voltage source. While in the case of ...
... source will see the controlled system as the same equivalent resistor at each harmonic frequency. Our solution considers the main parameters of the system (the capacitance and the inductance) and of the applied load as unknowns; we also allow for harmonics in the voltage source. While in the case of ...
0901008
... units in paralleling. These techniques need some forms of control interconnection among the paralleling inverters (K. De Brabandere 2007 and Y. Li et al. 2004). These interconnecting wires not only restrict the location of the inverter units, but can also act as a source of noise and failure. Theref ...
... units in paralleling. These techniques need some forms of control interconnection among the paralleling inverters (K. De Brabandere 2007 and Y. Li et al. 2004). These interconnecting wires not only restrict the location of the inverter units, but can also act as a source of noise and failure. Theref ...
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.