Author: Vijay
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Totem-pole Power factor Correction (PFC) Rectifier: Analysis and Design
Totem-pole PFC Circuit Analysis The analysis of totem-pole PFC circuit involves mainly derive and design of the following components. When positive input voltage and currents, D2 always conduct; Q1 and Q2 conduct alternatively When negative input voltage and currents, D1 always conduct; Q1 and Q2 conduct alternatively In a full cycle period, the area of…
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Totem-pole Power Factor Correction (PFC) Rectifier: Description and Operation
Totem-pole PFC rectifier is widely used topology in single-phase applications for power factor correction. Circuit Description The totem-pole topologies are shown below. This topology replace the conventional diode bridge rectifier in boost PFC topology with an active high-frequency switches in one leg and low-frequency diodes in another leg. The diode leg can be further replace…
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Variable Frequency Control Method
Variable frequency control, as name saying, this type of control keep on change the frequency for controlling the converter output voltage. Vo = Function (frequency) In this control, the PWM pulse frequency either increases or decreases to get the required output voltage after the design as per reference value given. Full-bridge Inverter: In general, normal…
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Rectifier Filters: Use of filters, Types of filters, Design of filters
The rectifier is used to convert the AC source to DC source. But in actual, it can produce pulsating DC that means waveform will have both AC and DC components. To get actual DC voltage, we need to use filters those reduce or eliminates the AC quantity and gives only DC quantity to the load.…
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Zero-voltage switching (ZVS) considerations and limits in PSFB Resonant Converter
The ZVS analysis with its considerations and derivation of critical/boundary equations to operate circuit shown in PSFB circuit and operation modes are discussed in PSFB operation with turn-on loss-free converter are discussed below. In simple words, achieving ZVS means the MOSFET is turning-ON with zero voltage across it. This can happen when the internal output…
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Magnetic Core Material Hysteresis Loop (BH curve)
Hysteresis means lagging. The Hysteresis loop is used to understand the properties of the magentic core material. It is an important paremater in the selection of core material for various applications. We know, when placing the magnetic material inside the current carrying electrical circuit, EMF will be produced. In magnetic field, a magnetic bar is…
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Example of Transformer Design Procedure with Core Selection Cross-checking and Calcultion of Losses
Design Procedure: The design of transformer procedure is given here. Step-3: Calculate the area product (AP) for the selction of core using the equation. It is a product of window (AW) and cross-sectional (AE) areas of core. From core data sheet, AE is directly available AE = 420 mm2 Window area can be calculated using…
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Transformer Losses Explanation and Its Equations Derivation Fundamentals
Losses occurs in the transformer by its core and conductor materials. These are named as Core losses are depends on the only core properties and these are sub-divided into Hysterisis and eddy current losses. Copper losses are depends on the only conductor properties i.e. wire. Hysteresis Losses When we place the magnetic core around a…
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Different flux wavefroms and variation of its RMS EMF equations
Average value of EMF for a transformer primary coil is Sinusoildal Flux Form factor is 1.11. Hence, RMS EMF Bipolar Square Flux Form factor is 1. Hence, RMS EMF Unipolar Square Flux The average EMF for unipolar square flux is Form factor for unipolar flux is 1, therefore RMS EMF is
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Derivation of Transformer Core Area Product and Number of turns Equations used in Design Procedure
Area Product (AP) of core and number of turns (Np and Ns) for winding on core are two main equations which used in transformer desing procedure Area Product (AP) Area product is nothing but product of two areas, here in magnetics design, it’s a cross-sectional area and window area. Current carrying conductor/wire is an electrical…
