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ATPL250A - Atmel Corporation
ATPL250A - Atmel Corporation

Multi-Output Power Supplies with VCOM Amplifier and High
Multi-Output Power Supplies with VCOM Amplifier and High

... The MAX17126B generates all the supply rails for thinfilm transistor liquid-crystal display (TFT LCD) TV panels operating from a regulated 12V input. They include a step-down and a step-up regulator, a positive and a negative charge pump, an operational amplifier, a highaccuracy high-voltage gamma r ...
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... connected. The drive current capability in parallel operation is 2X the drive of either channel. Small differences in switching speed between the driver channels will produce a transient current (shoot-through) in the output stage when two output pins are connected to drive a single load. Difference ...
PI3426832691
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... standard machines, redesigned motors are not considered the best solution [2]. One of the mature control systems of induction motor is the field oriented control method. The FOC method is widely used and presents some high standards in modern industrial drives. A continuous trend in IM drives is to ...
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... Understandably, early designs in this field owed a lot to previous valve ampli­ fier practice, with transformer inter­ stage coupling being used to allow a push-pull output configuration. How­ ever, the real break-through in this field came with the introduction, in 1956, of the " quasi-complementar ...
Series 700 A/VS Power Conditioner
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... furnishes bias voltage for germanium detectors, silicon detectors, or ionization chambers. It can be used with any detector that draws less than 100 A of current, and whose gain is insensitive to the applied voltage. The output voltage is continuously adjustable from zero to full scale with a calibr ...
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Y. Han, A. Li, G. Cheung, C.R. Sullivan, and D.J. Perreault, “Evaluation of Magnetic Materials for Very High Frequency Power Applications,” 2008 IEEE Power Electronics Specialists Conference , June 2008, pp. 4270 – 4276
Y. Han, A. Li, G. Cheung, C.R. Sullivan, and D.J. Perreault, “Evaluation of Magnetic Materials for Very High Frequency Power Applications,” 2008 IEEE Power Electronics Specialists Conference , June 2008, pp. 4270 – 4276

... by varying the amplitude of the rf source. The current of the inductor is equal to the capacitor current and can be calculated from the output voltage and the known capacitor impedance. (These considerations motivate the use of high-precision lowloss capacitors such as mica or porcelain capacitors. ...
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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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