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PP101007-a - Indico
PP101007-a - Indico

... semiconductors are in the off-state (i.e. zero current in the load). Only the triggers for the switched elements of the power supply are inhibited. ...
EN 1724852
EN 1724852

... voltage with reference voltage generated by varying the width of each comparator depending on the value of reference voltage each comparator gives its logic level. The four bit comparator requires fifteen comparator since they will generate their respective fifteen levels in this way they are acting ...
Full-text
Full-text

Load balancing by SVC Light
Load balancing by SVC Light

PDF - WordPress.com
PDF - WordPress.com

... The interest in Distributed Generation (DG) systems is rapidly increasing because larger power plants are becoming less feasible in many regions due to increasing fuel costs and stricter environmental regulations. Distributed generation systems (DGS) have mainly been used as a standby power source f ...
Gain Block Active Bias Circuit AN035
Gain Block Active Bias Circuit AN035

... The value of Vref will be determined by selecting the appropriate gain control resistor values for operational amplifier U1. The component value table on Page 2 shows the resistor values (R1-R4) required to set Vref at 4.71 volts with a supply voltage of 5.00 volts. U1 must be a single supply, rail- ...
- Electrotehnică, Electronică, Automatică (EEA)
- Electrotehnică, Electronică, Automatică (EEA)

Design Idea
Design Idea

... can be used to drive LEDs with a constant current IP from a variable voltage source VIN, see right figure. The only condition is to limit the voltage across the CLD to a value less than VAK; that voltage is the difference between V IN and the voltage drop at the LED, VF-LED. The CL20M45 is designed ...
G1-M1 (Protection Relay)
G1-M1 (Protection Relay)

... Which actions are executed? Measuring ...
Selecting the correct IC for power-supply
Selecting the correct IC for power-supply

ICS251 - Integrated Device Technology
ICS251 - Integrated Device Technology

ARDUINO AND NOKIA 3310 LCD, 84x84 pixels
ARDUINO AND NOKIA 3310 LCD, 84x84 pixels

... diodes within the 3.3V device will attempt to clamp the incoming signal to 3.3V thus protecting the rest of the 3.3V device. Clamping diodes are normally found on the input lines of low voltage devices. Note that according to the code in the library all pins are configured as output pins on the ardu ...
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ry: I I s

Power Flow Formulation Based on a Mixed-Linear and
Power Flow Formulation Based on a Mixed-Linear and

... i.e. fixed amounts of active and reactive power are consumed by the load regardless of the voltage at the bus delivering electricity to that particular load. However, the actual active and reactive power consumed by the loads are functions of the voltage magnitude and the frequency at the load termi ...
STK5DFU340D-E Advance Information 2-in
STK5DFU340D-E Advance Information 2-in

... CB is recommended to be approximately 3 times the value calculated above. The recommended value of CB is in the range of 1 to 47 μF, however, the value needs to be verified prior to production. When not using the bootstrap circuit, each high side driver power supply requires an external independent ...
O A RIGINAL RTICLES
O A RIGINAL RTICLES

... schematically construct a circuit, run simulation, analyze the results, and manage the data with a graphical environment and view the results directly during simulation. It is one of the most powerful and intuitive CAD software packages available. Load Flow Analysis Model: Power flow analysis is the ...
BUT11/ 11A NPN Silicon Transistor Absolute Maximum Ratings
BUT11/ 11A NPN Silicon Transistor Absolute Maximum Ratings

... 2. A critical component is any component of a life support which, (a) are intended for surgical implant into the body, device or system whose failure to perform can be or (b) support or sustain life, or (c) whose failure to perform reasonably expected to cause the failure of the life support when pr ...
LM2575
LM2575

... voltage range and available in an adjustable output version, the LM2575 has an integrated switch capable of delivering 1 A of load current, with excellent line and load regulation. The device also offers internal frequency compensation, a fixed-frequency oscillator, cycle-by-cycle current limiting, ...
IOSR Journal of VLSI and Signal Processing (IOSR-JVSP)
IOSR Journal of VLSI and Signal Processing (IOSR-JVSP)

No Slide Title - UW BME Design - University of Wisconsin–Madison
No Slide Title - UW BME Design - University of Wisconsin–Madison

... and easy to use rat vital monitoring device to aid in this process. The current design for this monitoring device includes force-sensing resistors for monitoring breathing rate, thermistors to monitor rectal temperatures, and pulse oximeters to monitor SpO2 levels and heart rates. The design also in ...
EE_ece_3rd - Jasdev Singh Sandhu Group of Institutes
EE_ece_3rd - Jasdev Singh Sandhu Group of Institutes

... What is efficiency? Derive the condition for maximum efficiency. What is auto-transformer how it is different from conventional Explain the following a. Star connection b. Delta connection Explain the 3-phase and 4-wire system of distribution of electrical power. Mention the advantage of underground ...
AN021 : Voltage Level Conversion
AN021 : Voltage Level Conversion

The proposed switched-coupled-inductor converter is a
The proposed switched-coupled-inductor converter is a

... with a high voltage conversion ratio inherent in this converter. By adopting coupled-inductor and switched-capacitor techniques, the proposed converter successfully enlarges the voltage conversion ratio without a high turns ratio of the coupled inductor. The proposed converter can be also expanded t ...
ZXLD1360Q Description Pin Assignments Features Typical
ZXLD1360Q Description Pin Assignments Features Typical

Page 1 of 8 6moons audio reviews: darTZeel NHB
Page 1 of 8 6moons audio reviews: darTZeel NHB

< 1 ... 803 804 805 806 807 808 809 810 811 ... 1202 >

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.
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