1) Consider the following pulse width modulation RC circuit. The circuit consist
ID: 1854032 • Letter: 1
Question
1) Consider the following pulse width modulation RC circuit. The circuit consists of a switch, two resistors and a capacitor. The resistances of these two resistors are 100?. The capacitance of the capacitor is 50?F. The corresponding circuit scheme for each topology is shown below: a) What is the input current and the voltage across the output load and current across the output load? (Hint: input current is the mean of the vector I, while output voltage is the mean of the vector y. Use this value to calculate the output current.) b) What is the efficiency of the converter? (Use the values above to calculate the input and output powers to obtain the efficiency)Explanation / Answer
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, 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. Contents [hide] 1 History 2 Principle 2.1 Delta 2.2 Delta-sigma 2.3 Space vector modulation 2.4 Direct torque control (DTC) 2.5 Time proportioning 2.6 Types 2.7 Spectrum 2.8 PWM sampling theorem 3 Applications 3.1 Telecommunications 3.2 Power delivery 3.3 Voltage regulation 3.4 Audio effects and amplification 3.5 Electrical 4 See also 5 References 6 External links
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