Control of DFIG-WT under unbalanced grid voltage conditions
... ⎣⎢iβ r ⎦⎥ vαβ rs ⎢⎣ vβrs ⎦⎥ vαβ rs ⎢⎣vβ rs ⎦⎥ ...
... ⎣⎢iβ r ⎦⎥ vαβ rs ⎢⎣ vβrs ⎦⎥ vαβ rs ⎢⎣vβ rs ⎦⎥ ...
2016 China International Conference on Electricity Distribution
... minimum interval is 0.02 Hz. Since voltage fluctuation can endanger sensitive loads widely and potentially a number of research studies have been conducted on its detection. Hilbert Huang Transform (HHT) is often used at present, since it can provide instantaneous frequency and instantaneous amplitu ...
... minimum interval is 0.02 Hz. Since voltage fluctuation can endanger sensitive loads widely and potentially a number of research studies have been conducted on its detection. Hilbert Huang Transform (HHT) is often used at present, since it can provide instantaneous frequency and instantaneous amplitu ...
Aalborg Universitet Application with Shunt Active Power Filter Embedded
... output of the UPS system, as shown in Fig. 1. Thus all DC/AC modules will see resistive load no matter which kind of load the system has since the shunt APF eliminates the harmonics brought by the load. As a result, DC/AC modules provide only active power. Hereby, a virtual resistor is inserted into ...
... output of the UPS system, as shown in Fig. 1. Thus all DC/AC modules will see resistive load no matter which kind of load the system has since the shunt APF eliminates the harmonics brought by the load. As a result, DC/AC modules provide only active power. Hereby, a virtual resistor is inserted into ...
2.1 Make Accurate Low-Level Measurements with High
... The best way to understand the concept of resolution is by comparison with a yardstick. Divide a 1 meter yardstick into millimeters. What is the resolution? The smallest “tick” on the yardstick is the resolution. Yes, you might be able to “interpolate” between these, but in the absence of this sophi ...
... The best way to understand the concept of resolution is by comparison with a yardstick. Divide a 1 meter yardstick into millimeters. What is the resolution? The smallest “tick” on the yardstick is the resolution. Yes, you might be able to “interpolate” between these, but in the absence of this sophi ...
Operation Manual – April 2012
... sequencer before connecting the Sync-Step. Since the early development of electronic musical instruments there have been many different voltage standards between manufacturers. 5 Volts DC is very common in more recent times but some early analogue devices used 15 Volts DC to trigger EGs and VCAs. Th ...
... sequencer before connecting the Sync-Step. Since the early development of electronic musical instruments there have been many different voltage standards between manufacturers. 5 Volts DC is very common in more recent times but some early analogue devices used 15 Volts DC to trigger EGs and VCAs. Th ...
V. Board Design - UCF EECS - University of Central Florida
... its upper threshold, which forces an internal comparator to go high and turn the PFETs off. When the PFETs are off the current flows through the catch diodes D1 and D2, and the current through the LED and inductors decrease until the SNS voltage falls to its lower threshold. From here the cycle repe ...
... its upper threshold, which forces an internal comparator to go high and turn the PFETs off. When the PFETs are off the current flows through the catch diodes D1 and D2, and the current through the LED and inductors decrease until the SNS voltage falls to its lower threshold. From here the cycle repe ...
as PDF
... Figure 7: Input and output signals at voltage monitors. The overshoots and especially the undershoots are not acceptable. Certain improvements in the loads or the board technology have to be done in order to guarantee signal integrity. ...
... Figure 7: Input and output signals at voltage monitors. The overshoots and especially the undershoots are not acceptable. Certain improvements in the loads or the board technology have to be done in order to guarantee signal integrity. ...
ZXLD1350 30V 350mA LED DRIVER with AEC-Q100 Description
... When input voltage VIN is first applied, the initial current in L1 and RS is zero and there is no output from the current sense circuit. Under this condition, the (-) input to the comparator is at ground and its output is high. This turns MN on and switches the LX pin low, causing current to flow fr ...
... When input voltage VIN is first applied, the initial current in L1 and RS is zero and there is no output from the current sense circuit. Under this condition, the (-) input to the comparator is at ground and its output is high. This turns MN on and switches the LX pin low, causing current to flow fr ...
AMS2907 数据手册DataSheet 下载
... Note 2: Line and Load regulation are guaranteed up to the maximum power dissipation of 1.2W for SOT-223 package and 0.9W for SOT-89 package. Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the fu ...
... Note 2: Line and Load regulation are guaranteed up to the maximum power dissipation of 1.2W for SOT-223 package and 0.9W for SOT-89 package. Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the fu ...
TPS62240 数据资料 dataSheet 下载
... The TPS62240 step down converter operates with typically 2.25MHz fixed frequency pulse width modulation (PWM) at moderate to heavy load currents. At light load currents, the converter can automatically enter Power Save Mode and operates then in PFM mode. During PWM operation, the converter uses a un ...
... The TPS62240 step down converter operates with typically 2.25MHz fixed frequency pulse width modulation (PWM) at moderate to heavy load currents. At light load currents, the converter can automatically enter Power Save Mode and operates then in PFM mode. During PWM operation, the converter uses a un ...
CHAPter 10 - Amazon Web Services
... problems. Figure 10-3 shows the circuit diagram for a ladder type D/A converter. ...
... problems. Figure 10-3 shows the circuit diagram for a ladder type D/A converter. ...
UCC2837 数据资料 dataSheet 下载
... The transient performance of a linear regulator built using the UCC3837 can be predicted by understanding the dynamics of the transient event. Consider a load transient on the application circuit of Fig. 1, where the output current steps from a low value to a high value. Initially, the output voltag ...
... The transient performance of a linear regulator built using the UCC3837 can be predicted by understanding the dynamics of the transient event. Consider a load transient on the application circuit of Fig. 1, where the output current steps from a low value to a high value. Initially, the output voltag ...
CHAPter 10 - Amazon Web Services
... problems. Figure 10-3 shows the circuit diagram for a ladder type D/A converter. ...
... problems. Figure 10-3 shows the circuit diagram for a ladder type D/A converter. ...
report - Auburn Engineering
... From the data in the table, the maximum energy savings we are able to achieve is almost 95%. V. CONCLUSION This project has examined the operation of a circuit in a subthreshold region. We have shown that a circuit can still function as its intended design when operated below the threshold voltage. ...
... From the data in the table, the maximum energy savings we are able to achieve is almost 95%. V. CONCLUSION This project has examined the operation of a circuit in a subthreshold region. We have shown that a circuit can still function as its intended design when operated below the threshold voltage. ...
All in One PC Power Supply Reference Design
... Pdrv = Q g ⋅ Fsw ⋅ Vcc => gate charge selection - Body diode losses ...
... Pdrv = Q g ⋅ Fsw ⋅ Vcc => gate charge selection - Body diode losses ...
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.