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ME995-3K VARIABLE DOSERATE KILOGRAMS OF CEMENT
ME995-3K VARIABLE DOSERATE KILOGRAMS OF CEMENT

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On the Cause and Control of Residual Voltage Generated by
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... on the electrode without feedback. The width of the anodic pulse remains unaltered during this time. Region B clearly shows that the residual voltage is being maintained at the set point (VSP = 0), due to the onset of the feedback set by k = 1000 s/V. The average anodic pulse width is about 916 µs b ...
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... simultaneously, the shunt peaking technique was used in the TIA stage. Figure 3 shows that the bandwidth can be significantly improved by using the shunt peaking technique. However, this comes at the cost of significant gain peaking which introduces Inter Symbol Interference (ISI). For this reason, ...
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... the current to the motor will be a series of high current pulses instead of the desired average of the voltage waveform. Averaging is easier to attain at lower frequencies if the parasitic motor inductance is relatively high, but high inductance is an undesirable motor characteristic. The ideal freq ...
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2014 RA420 PEMC2014 135-Ozsoy
2014 RA420 PEMC2014 135-Ozsoy

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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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