High Pass RC Circuit Diagram, Derivation and Application: The High Pass RC Circuit is shown in Fig. 29.1. The reactance of the capacitor is given as i.e., Reactance XC of the circuit capacitor decreases with the increase in frequency. Thus at low frequencies the capacitor C offers considerable reactance and so blocks them, but at […]
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Single Phase Full Bridge Inverter: The main drawback of half-bridge inverter is that it requires 3-wire dc supply. This difficulty can, however, be overcome by using a single phase full bridge inverter shown in Fig. 27.39 (a). It consists of four thyristors and four diodes. In this inverter, number of thyristors and diodes is twice
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Inverter – Definition and Classification of Inverters: A device that converts dc power into ac power at desired output voltage and frequency is known as an inverter. Some industrial applications of inverters are for adjustable-speed ac drives, induction heating, standby aircraft power supplies. The dc power input to the inverter may be battery, fuel cells,
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Three Phase Cycloconverter – Types, Working and Applications: A cycloconverter converts ac at one frequency to an ac of another frequency. Cycloconverters can be classified as single-phase to single-phase, three-phase to single-phase and three-phase to 3-phase devices. They can also be classed as step-up and step-down cycloconverters. A step-up cycloconverter provides an output whose frequency
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AC Regulator – Definition and Classification: An ac regulator converts a constant ac voltage into a variable ac voltage of the same frequency. No doubt, ac voltage level can be changed by auto-transformer, tap-changing transformer, saturable reactors etc. These devices have been in use for long time and still are in use. But ac regulators
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Step Down Chopper with RLE Load Working Principle: The choppers are widely employed for speed control of dc motors in industrial and traction drives. Figure 27.30 (a) shows the basic Step Down Chopper with RLE Load for the control of a dc series motor. The Step Down Chopper with RLE Load is shown to consist
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Step up Step down Chopper or Buck Boost Converter – Working Principle: A chopper can also be used for stepping up or down the supply voltage by varying its duty cycle. This is also known as a buck-boost converter. The principle of operation is illustrated in Fig. 27.29. As shown, the output voltage polarity is
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Step up Chopper – Definition, Circuit Diagram and its Working Principle: In a step-down chopper the output voltage lies between zero and supply voltage. However, there are techniques by which the output of a chopper obtained is higher than the supply voltage. Such types of choppers are called Step up Chopper. The circuit diagram of
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Three Phase Converter Circuit: For large sized (rating exceeding 15 kW) motors 3-phase drive is employed. The output voltage of a 3-phase converter has less ripple contents than that of single-phase converter. So the filtering requirements for smoothing out the load current are less and the current is mostly continuous. Three phase converter could be
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Single Phase Dual Converter Circuit Diagram with Four Quadrant of Operation: We have seen that Single Phase full Converters with inductive loads allow only a two-quadrant operation. If two of these full converters are connected back to back, it is known as Single Phase Dual Converter as depicted in Fig. 27.20 (a) , both the
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