Measurement and technology
... (2) lowand medium-frequency circuits (up to a few megahertz), (3) and (3) high-frequency circuits (up to a few gigahertz). Line-frequency circuits: related specifically to the three-phase power supply ...
... (2) lowand medium-frequency circuits (up to a few megahertz), (3) and (3) high-frequency circuits (up to a few gigahertz). Line-frequency circuits: related specifically to the three-phase power supply ...
AC vs DC AC Voltage stands for Alternating Current. The flow of elec
... “What is the difference between AC & DC?” ...
... “What is the difference between AC & DC?” ...
REFINEMENT OF HARMONICS USING APF WITH SINUSOIDAL
... cancellation of lower-order harmonics by controlling the input currents Ifa, Ifb, and Ifc to be at the desired harmonic frequencies, with variable amplitude and phase, and opposite to the load generated harmonics (ILa; ILb; ILc). The PWM switching frequency is chosen to be high and the switching fre ...
... cancellation of lower-order harmonics by controlling the input currents Ifa, Ifb, and Ifc to be at the desired harmonic frequencies, with variable amplitude and phase, and opposite to the load generated harmonics (ILa; ILb; ILc). The PWM switching frequency is chosen to be high and the switching fre ...
Design Strategy for a 3-Phase Variable Frequency Drive (VFD)
... new PWM output from the micro-controller discussed earlier in this section; which is fed into the driver. The internal circuitry to the driver takes the logic level input and uses that to control the output which goes to the MOSFTE gate. Figure 3.1 shows the internal structure to the Gate Driver. It ...
... new PWM output from the micro-controller discussed earlier in this section; which is fed into the driver. The internal circuitry to the driver takes the logic level input and uses that to control the output which goes to the MOSFTE gate. Figure 3.1 shows the internal structure to the Gate Driver. It ...
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... appropriate signals to inverter switches. In addition to XILINX FPGA, Matlab/Simulink, system Generator software was used for simulation and verification of the proposed circuit before implementation, Simulation and experimental results show that both are in close agreement. The present PWM signal g ...
... appropriate signals to inverter switches. In addition to XILINX FPGA, Matlab/Simulink, system Generator software was used for simulation and verification of the proposed circuit before implementation, Simulation and experimental results show that both are in close agreement. The present PWM signal g ...
WK239ARM MICRO CONTROLLER BASED AUTOMATIC PLANT
... and embedded trace support, together with 128/512 kilobytes of embedded high speed flash memory. A 128-bit wide memory interface and unique accelerator architecture enable 32-bit code execution at maximum clock rate. For critical code size applications, the alternative 16-bit Thumb Mode reduces code ...
... and embedded trace support, together with 128/512 kilobytes of embedded high speed flash memory. A 128-bit wide memory interface and unique accelerator architecture enable 32-bit code execution at maximum clock rate. For critical code size applications, the alternative 16-bit Thumb Mode reduces code ...
0496755001195066370
... conversion. Control circuitry includes use of a popular Synchronous PWM controller for voltage regulation and overload current limit. Protection circuitry includes output short circuit current limit. The output shuts down when the voltage feedback loop is opened. ...
... conversion. Control circuitry includes use of a popular Synchronous PWM controller for voltage regulation and overload current limit. Protection circuitry includes output short circuit current limit. The output shuts down when the voltage feedback loop is opened. ...
- Krest Technology
... This paper presents a flux-weakening solution by employing the voltage boost capability of Z-source inverters to overcome the voltage limitation in conventional drives for highspeed applications, e.g. hybrid/electric vehicles. In this control strategy, a flux-weakening algorithm has been developed t ...
... This paper presents a flux-weakening solution by employing the voltage boost capability of Z-source inverters to overcome the voltage limitation in conventional drives for highspeed applications, e.g. hybrid/electric vehicles. In this control strategy, a flux-weakening algorithm has been developed t ...
CT-CATVPS60/90 CATV Power Supply 60/90VAC, 15A
... The CableTronix CT-CATVPS60/90 is a CATV power supply designed to provide conditioned power to remote active devices over a hardline CATV cable distribution plant. This unit is designed to work with either 120VAC or 220VAC input voltages with a 60VAC or 90VAC selectable output. The enclosure is buil ...
... The CableTronix CT-CATVPS60/90 is a CATV power supply designed to provide conditioned power to remote active devices over a hardline CATV cable distribution plant. This unit is designed to work with either 120VAC or 220VAC input voltages with a 60VAC or 90VAC selectable output. The enclosure is buil ...
MH7702
... to 22μH. Small size and better efficiency are the major concerns for portable device, such as MH7702 used for mobile phone. The ...
... to 22μH. Small size and better efficiency are the major concerns for portable device, such as MH7702 used for mobile phone. The ...
LED Po w er - Power Partners, Inc.
... Dimming Control (-D type only) For -A type, dimming and output current adjustment is set by internal potentiometer, which can be accessed by removing the “Adj Io” plug on the LED driver case. For -D type, dimming can be controlled in 3 different ways using the Dim(+) and Dim(-) leads: using an exter ...
... Dimming Control (-D type only) For -A type, dimming and output current adjustment is set by internal potentiometer, which can be accessed by removing the “Adj Io” plug on the LED driver case. For -D type, dimming can be controlled in 3 different ways using the Dim(+) and Dim(-) leads: using an exter ...
2A. Two similar inductive coils with negligible resistance are wound
... 4A. A symmetrical 3 phase, RYB sequence, 3 wire, 400V, 50 Hz supply feeds an unbalanced star connected load. The branch impedances of the load are Z R= (8.66+j5) Ω, ZY = (7.07‐j7.07) Ω and ZB=(10+j17.32) Ω. Calculate the three line currents by converting star connected ...
... 4A. A symmetrical 3 phase, RYB sequence, 3 wire, 400V, 50 Hz supply feeds an unbalanced star connected load. The branch impedances of the load are Z R= (8.66+j5) Ω, ZY = (7.07‐j7.07) Ω and ZB=(10+j17.32) Ω. Calculate the three line currents by converting star connected ...
Micropower Circuit Monitors Positive Supply
... Abstract: The following application note shows a circuit that converts the load current of a positive power supply into a ground referenced signal voltage using the ICL7612 operational amplifier. The inexpensive circuit of Figure 1 converts the load current of a positive power supply to a groundrefe ...
... Abstract: The following application note shows a circuit that converts the load current of a positive power supply into a ground referenced signal voltage using the ICL7612 operational amplifier. The inexpensive circuit of Figure 1 converts the load current of a positive power supply to a groundrefe ...
Lecture: PWM Techniques - Ohio State ECE
... Excellent dynamic response Low cost and easy implementation ...
... Excellent dynamic response Low cost and easy implementation ...
BD35310316
... required to produce N level output is (m-1) where m is the number of carrier waveforms. The single sinusoidal reference waveform has peak to peak amplitude of A m and a frequency fm. The multiple triangular carrier waves are having same peak to peak amplitude Ac and frequency fc (4). The single sinu ...
... required to produce N level output is (m-1) where m is the number of carrier waveforms. The single sinusoidal reference waveform has peak to peak amplitude of A m and a frequency fm. The multiple triangular carrier waves are having same peak to peak amplitude Ac and frequency fc (4). The single sinu ...
Rack mount Power supply with 90
... UL, CSA, TUV, BABT Recognized Enable control (active low) EN55022 Class B N+1 Redundant Accurate current sharing utilizing third wire on 2.5V and 3.3V Low profile height fits 1U system ...
... UL, CSA, TUV, BABT Recognized Enable control (active low) EN55022 Class B N+1 Redundant Accurate current sharing utilizing third wire on 2.5V and 3.3V Low profile height fits 1U system ...
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.