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Introduction
Introduction

METRAHIT  ENERGY TRMS SYSTEM Multimeter
METRAHIT ENERGY TRMS SYSTEM Multimeter

... Or in the case of power measurement: • Momentary measured values of active power, voltage and current • Maximum value for periodic power with date and time User Safety and Overload Protection Dangerous alternating contact voltages of greater then 30 V and direct voltages of greater than 35 V are ind ...
Power MOSFET Basics: Understanding Gate Charge and Using it to
Power MOSFET Basics: Understanding Gate Charge and Using it to

... such Cgd and Cds stay relatively constant, since they vary as a function of Vds. At this time Cgs is generally larger than Cgd and therefore the majority of drive current flows into Cgs rather than into Cgd. This current, through Cgd and Cds, depends on the time derivative of the product of the capa ...
LM2596 - ONSemi
LM2596 - ONSemi

... (buck converter). It is capable of driving a 3.0 A load with excellent line and load regulation. This device is available in adjustable output version and it is internally compensated to minimize the number of external components to simplify the power supply design. Since LM2596 converter is a switc ...
IOSR Journal of Electrical and Electronics Engineering PP 46-54 www.iosrjournals.org
IOSR Journal of Electrical and Electronics Engineering PP 46-54 www.iosrjournals.org

Owners Instruction Manual - Alner Hamblin Electronics
Owners Instruction Manual - Alner Hamblin Electronics

... to the “bridge” position and the upper “left” phono socket (or the left XLR socket) is used for the input. The two red speaker terminals are used to connect to the loudspeaker, with the one nearest the input sockets (left channel) being “positive”. As supplied, the amplifier electronics zero volt li ...
power distribution equipment
power distribution equipment

ZXCT1023EV1 User Guide Issue 1
ZXCT1023EV1 User Guide Issue 1

... small value sense resistors necessary at higher currents. The wide input voltage range of 20V down to as low as 2.5V makes it suitable for a range of applications. It requires no additional components, thus making it a versatile device with minimal component count. The ZXCT1023 in the TDFN1218-4L pa ...
Transient Voltage Protection for Stratix GX Devices
Transient Voltage Protection for Stratix GX Devices

... Ampere’s Law states that a current through a looped conductor generates a magnetic field. If this current is changing with time (di/dt), the flux of the magnetic field, through the area shaped by that line, changes with time as well (dФ/dt). Faraday’s Law states that a voltage emerges between the ed ...
Final Control Element
Final Control Element

... are needed, but can also be used for linear applications by transforming circular to linear motion with a bolt and screw transducer. On the other hand, some actuators are intrinsically linear, such as piezoelectric actuators. ...
PI_SC1271K rev B 060515_Off-Line CVCC Flyback
PI_SC1271K rev B 060515_Off-Line CVCC Flyback

... The InnoSwitch? family of ICs dramatically simplifies the development and manufacturing of low-voltage, high current power supplies, particularly those in compact enclosures or with high efficiency requirements. The InnoSwitch architecture is revolutionary in that the devices incorporate both primar ...
Arrangement for Connecting Plural Self
Arrangement for Connecting Plural Self

... A power converter device according to claim 1, further comprising: a gate blocking means for stopping the operation of said converters; and a gate deblocking means for restarting the operation of said converters. 5. A power converter device according to claim 2, further comprising: a gate blocking m ...
Tuning for Mileage by mpgmike
Tuning for Mileage by mpgmike

... Often times addressing only a few of the ECU’s inputs will allow you to tune for a mileage gain, only to have the adaptive memory take it away as time goes on. The load sensing devices give the ECU a clue as to what you are up to, and it won’t tolerate it. By generating a lower voltage signal from t ...
MC33800, Engine Control Integrated Circuit
MC33800, Engine Control Integrated Circuit

... The 33800 is a combination output switch and driver Integrated Circuit (IC) which can be used in numerous powertrain applications. The IC contains two programmable constant current drivers (CCD), an octal, low side, serial switch (OSS), and six, external MOSFET gate pre-drivers (GD). The IC has over ...
Guidelines for Evaluating System Performance of Cypress
Guidelines for Evaluating System Performance of Cypress

... You can verify basic crystal oscillator operation by using an oscilloscope. However, because most oscilloscopes cannot measure signal frequency accurately, you should use a frequency counter for this measurement. If the crystal frequency is not within the specified limits, investigate the cause of t ...
DC to DC Square Root Transmitters, Isolated API 4440 G
DC to DC Square Root Transmitters, Isolated API 4440 G

... external zero and span controls for fine adjustment. It is then passed to the output stage, which is internally configured for voltage or current output, with the gain scaled to the specific range required. Common ranges as well as custom ranges are possible. Consult the factory for assistance with ...
NA-277 277V to 120V Step Down Transformer
NA-277 277V to 120V Step Down Transformer

... Nora's step down transformer is an accessory offered to take 277V supply voltage and reduce it to 120V. The transformer is installed by a qualified electrician on a supply junction box before the 120V load. ...
CA3140, CA3140A
CA3140, CA3140A

... For those cases where bandwidth reduction is desired, for example, broadband noise reduction, an external capacitor connected between Terminals 1 and 8 can reduce the open loop -3dB bandwidth. The slew rate will, however, also be proportionally reduced by using this additional capacitor. Thus, a 20% ...
Aalborg Universitet Modulation Scheme for Harmonic Reduction
Aalborg Universitet Modulation Scheme for Harmonic Reduction

Motor Starters
Motor Starters

... As the horse power of a motor increases the maximum number of starts per hour increases or decreases? ...
Linear Complexity Search Algorithm to Locate Shunt and Series
Linear Complexity Search Algorithm to Locate Shunt and Series

... X i max is the maximal size of shunt or series capacitor at location i which may be determined by physical and/or environmental considerations. In our optimization formulation, we do not include any voltage/line flow magnitude bounds as constraints since we mainly focus on the effect of capacitive c ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331,
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331,

... For efficient and reliable operation of power system, the voltage and reactive power control must be properly done to make voltage at all the buses within the acceptable limits [1]-[2]. Facts devices provide voltage support at critical buses in the system (shunt connected controllers) and regulate p ...
Power MOSFET Basics
Power MOSFET Basics

... smaller dimensions, RS, RCH, RACC are reduced because more individual unit cells can be packed in a given silicon area. RJFET on the other hand suffers from a “JFET”-effect where current is constrained to flow in a narrow n-region by the adjacent P-body region. Due to the absence of RJFET, trench ...
The capacitive divider in medium-voltage switchgear
The capacitive divider in medium-voltage switchgear

... However, the technology used offers much more than merely a continual visual “yes”/“no” indication. If a suitable device is connected onto the measurement capacitance of the divider, the value of the voltage can also be continuously displayed. If this cost-effective device is used directly at the in ...
A1147 and A1148: Low Current Ultrasensitive Two
A1147 and A1148: Low Current Ultrasensitive Two

... Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reliable operation between VCC(est) and VCC(max) requires enhanced RJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions. ...
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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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