Dual Converter Control of DC Separately Excited Motor: A Dual Converter Control of DC Separately Excited Motor (Fig. 5.35) consists of two fully-controlled rectifiers connected in anti-parallel across the armature. For power ratings upto around 10 kW, sigle-phase fully-controlled rectifiers can be used. For higher ratings, three-phase fully controlled rectifiers are employed. Rectifier A, which […]
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Performance of DC Motors Operating on Phase Controlled Converters: The nature of the output voltage and output current of a phase controlled converters impains the performance of the dc motor operating on these converters. The output of the converter is in the form of pulses. The average voltage is superimposed by an ac ripple which […]
DC Motor Control through Converters: DC motor control is conveniently and efficiently achieved by phase-controlled converters wherein the ac input voltage is converted to a controlled dc output. The commutation process, the transfer of current from one thyristor to the other, in these converters is the inexpensive natural or line commutation. As, an incoming thyristor is […]
AC DC Converters: AC DC Converters – The naturally commutated phase-controlled converter is a common type of controlled power electronic converter which has reigned supreme for the last 30 years. Above a few tens of kW, three-phase rectifiers are used, the most common arrangements being the fully/semi-controlled bridges. Semiconverter systems, including a free-wheeling diode give […]
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 […]