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Figure 1146 Three-phase voltage source inverter waveforms
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The VSI circuit described in the foregoing paragraphs can provide a variablefrequency supply provided that the commutation frequency of the electronic switches can be varied Thus, in general, it is necessary to also provide the capability for timing circuits that can provide variable switching rates; this is often accomplished with a microprocessor (discussed in 14) The limitations of the VSI of Figure 1145 can be overcome with the use of more advanced switching schemes, such as pulse-width modulation (PWM) and sinusoidal PWM The complexity of these schemes is beyond the scope of this book, and the interested reader is invited to explore a more advanced power electronics text to learn about advanced inverter circuits We shall simply mention that it is possible to signi cantly reduce the harmonic content of the inverter waveforms and to provide variable-frequency, variable-amplitude, three-phase supplies for AC motors by means of power switching circuits under microprocessor control These advances are nding a growing eld of application in the electric vehicle arena This subject is approached again in 17
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Power electronic devices can handle up to a few thousand volts and up to several hundred amperes and have a host of industrial applications Various families of power electronic circuits and their application were discussed in this chapter Voltage regulators are used in DC power supplies to provide a stable DC voltage output The principal element of a voltage regulator is the Zener diode Transistors nd application both as power ampli ers and as switches; BJTs, MOSFETs, and IGBTs are all commonly employed, especially for switching functions Each of these devices offers speci c advantages, such as greater current capability, or faster response Device technology is rapidly improving, especially among power MOSFETs Power diodes and various types of thyristors nd widespread application in recti ers and controlled recti ers, both for single- and three-phase circuits Recti ers are a necessary element of DC power supplies; controlled recti ers also nd application as DC motor drives and in many other variable-voltage applications Electric motor drives based on power electronic devices allow for the implementation of sophisticated motor controls DC motor drives include controlled regulators and choppers (DC-DC converters), while AC motor drives consist of inverter circuits (DC-AC converters) Both of the latter circuits make extensive use of high-power switching elements, such as MOSFETs, thyristors, BJTs, and IGBTs
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CYU 111 CYU 112 CYU 113 CYU 114 P = 13 W IL = 54 A; IAC = 075 A; = 8495 VL = 2387 V 120 V, 60 W
Part II
Electronics
HOMEWORK PROBLEMS
Section 1: Regulators and Recti ers 111 Repeat Example 111 for a 7-V Zener diode 112 For the current regulator circuit shown in Figure
P112, nd the expression for RS
RS Zener DC R vAC + ~ _ Constant current L1 L2 D2 D1
117 A vehicle battery charge circuit is shown in Figure
P117 Describe the circuit, and draw the output waveform (L1 and L2 represent the inductances of the windings of the alternator)
+ Vbatt
Figure P112
113 For the shunt-type voltage regulator shown in
Figure P113, nd the expression for the output voltage, Vout
RS Zener DC Vout
Figure P117
118 Repeat Example 112 for = /3 and /6 119 The circuit shown in Figure P119 is a speed control
system for a DC motor Assume that the thyristors are red at = 60 and that the motor current is 20 A and is ripple free The supply is 110 VAC (rms) a Sketch the output voltage waveform, vo b Compute the power absorbed by the motor c Determine the volt-amperes generated by the supply
Figure P113
114 For the circuit shown in Figure 1117, if the LR
load is replaced by a capacitor, draw the output waveform and label the values
S1 i vAC S2 + vo D1 D2
115 Draw vL (t) and label the values for the circuit in
Figure 1117 if the diode forward resistance is 50 , the forward bias voltage is 07 V, and the load consists of a resistor R = 10 and an inductor L = 2 H
116 For the circuit shown in Figure P116, vAC is a
sinusoid with 10-V peak amplitude, R = 2 k , and the forward-conducting voltage of D is 07 V a Sketch the waveform of vL (t) b Find the average value of vL (t)
Figure P119
1110 A full wave, single-phase controlled recti er is
used to control the speed of a DC motor The circuit is similar to that of Figure 112, except for replacing the resistive load with a DC motor The motor operates at 110 V and absorbs 4 kW of power The AC supply is 80 V, 60 Hz Assume that the motor inductance is very large (ie, the motor current is ripple free), and that the motor constant is 0055 V/rev/min If the motor runs at 1,000 rev/min at rated current: a Determine the ring angle of the converter b Determine the rms value of the supply current
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