Power Converters Interview Questions and Answers: 1. What is freewheeling diode? Ans. Freewheeling diode is a bypass or commutating diode. It is connected across motor terminals to allow for dissipation of energy stored in motor inductance and to provide for continuity of motor current when the thyristors are blocked. It also provides protection against transient overvoltages. […]
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Digital to Analog and Analog to Digital Converters Interview Questions and Answers: 1. Why conversion of an analog signal into an equivalent digital signal is essential? Ans. Because most sensors have analog output while much data processing is accomplished with digital computers, analog-to-digital conversion is essential. 2. What is digital-to-analog conversion? Ans. Basically, D/A conversion is the
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Voltage to Current Converter Circuit: Occasionally in industrial electronics, it is necessary to provide a current proportional to certain voltage, even though the load impedance may vary. A circuit which can perform this job, is called a Voltage to Current Converter Circuit. The circuit of Voltage to Current Converter Circuit is shown in Fig. 36.25.
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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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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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Single Phase Full Wave Controlled Rectifier (or Converter): In case of Single Phase Full Wave Controlled Rectifier (or Converter) both positive and negative halves of ac supply are used and, therefore, the effective value of dc voltage is high and ripple content is less compared to half-wave rectifiers. There are two basic configurations of Single
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What is a Power Converter? Solid-state power converter are employed for obtaining the appropriate form of electrical energy such as direct current or adjustable-frequency alternating current (required to operate most electronic circuits and motor drives) from fixed-frequency alternating current. Types of Power Converters: AC to DC converters : AC to DC converters convert alternating current
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Step Up Converter or Boost Converter: A Step Up Converter, or boost converter, produces a dc output voltage higher than its supply voltage. In the circuit shown in Fig. 17-34(a), L1 is directly connected to the supply, and D1 is in series with L1 and C1 The collector of Q1 is connected to the junction
Step Down Converter: A step-down switching regulator, or Step Down Converter (also termed a buck converter), produces a dc output voltage lower than its input voltage. The basic circuit arrangement for a step-down converter is shown in Fig. 17-30. Note the presence of the catch diode (D1). This is normally reverse biased when Q1 is
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