Switching Power Supplies A - Z (Second Edition) by Sanjaya Maniktala

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By Sanjaya Maniktala

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This publication is the main finished examine to be had of the theoretical and sensible facets of controlling and measuring Electromagnetic Interference in switching energy offers, together with enter filter out instability considerations.
The new version is carefully revised with six thoroughly new chapters, whereas the prevailing EMI chapters are accelerated to incorporate many extra step by step numerical examples and key derivations and EMI mitigation suggestions. New themes disguise the size and breadth of contemporary switching energy conversion innovations, lucidly defined in easy yet thorough phrases, now with uniquely targeted «wall-reference charts» delivering quick access to even advanced topics.
Step-by-step and iterative strategy for calculating high-frequency losses in ahead converter transformers, together with Proximity losses according to Dowells equations
Thorough, but uniquely easy layout flow-chart for development DC-DC converters and their magnetic parts below normal wide-input provide conditions
Step-by-step, solved examples for stabilizing keep watch over loops of all 3 significant topologies, utilizing both transconductance or traditional operational amplifiers, and both current-mode or voltage-mode keep an eye on

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But we may well ask — despite the obvious efficiency concerns, do we really need reactive components in principle! For example, we may have realized we don’t really need an input or output capacitor for implementing a linear regulator — because the seriesÀpass element (the BJT) is all that is required to block any excess voltage. For switching regulators, however, the reasoning is rather different. This leads us to the general “logic of switching power conversion” summarized below. • A transistor is needed to establish control on the output voltage and thereby bring it into regulation.

For example • • A certain parasitic inductance may be quite helpful during the turn-on transition of the switch — by acting to limit any current spike trying to pass through the switch. But it can be harmful due to the high voltage spike it creates across the switch at turn-off (as it tries to release its stored magnetic energy). On the other hand, a parasitic capacitance present across the switch, for example, can be helpful at turn-off — but unhelpful at turn-on, as it tries to dump its stored electrostatic energy inside the switch.

Eventually, it will reach an infinite value (in theory). In fact, this can be mathematically proven by differentiating the inductor charging current equation with respect to time, and then putting R 5 0 as follows: VIN ð1 2 e2tR=L Þ R   dIðtÞ VIN R 2tR=L 5 e R L dt IðtÞ 5  dIðtÞ  VIN 5  L dt  R50 The Principles of Switching Power Conversion 29 So, we see that when the inductor is connected directly across a voltage source VIN, the slope of the line representing the inductor current is constant and equal to VIN/L (the current rising constantly).

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