Search Results for – "dc to dc converter"

Dual Converter Control of DC Separately Excited Motor

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 […]

DC Motor Control through Converters

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: 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

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

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 […]

Synchronous Motor and Brushless DC Motor Drives

Synchronous Motor and Brushless DC Motor Drives: Brushless DC Motor Drives (Trapezoidal PMAC): The cross section of a 3-phase 2 pole Brushless DC Motor Drives is shown in Fig. 7.15. It has permanent magnet rotor with wide pole arc. The stator has three concentrated phase windings, which are displaced by 120° and each phase winding […]

DC Motor Drives

DC Motor Drives: Armature Voltage Control using Transformer : Variable voltage for the dc motor control can also be obtained by either using an auto-transformer or a Armature … Chopper Control of Separately Excited DC Motor : Motoring Control : A transistor Chopper Control of Separately Excited DC Motor drive is shown in Fig. … […]

Use of Efficient Semiconductor Converters

Use of Efficient Semiconductor Converters: Prior to development of Use of Efficient Semiconductor Converters, inefficient power modulators were employed in several applications. While replacement of these power modulators by the semiconductor converters in appropriate applications brings about substantial amount of energy saving, the cost of replacement can be recovered in a short period ranging from […]

DC Traction

DC Traction using Semiconductor Chopper Controlled DC Motors: Chopper control has replaced resistance control in all dc traction schemes, such as 1500 V dc main line and suburban traction, 750 V dc underground traction and electric buses. The chopper control has following additional advantages over the resistance control: Regenerative braking can be carried out almost […]