Circuits

DC Power Supplies: Power Management and Surge Protection for by Nihal Kularatna

By Nihal Kularatna

As we more and more use digital units to direct our day-by-day lives, so grows our dependence on trustworthy power assets to energy them. simply because smooth digital structures call for regular, effective, trustworthy DC voltage sources―often at a sub-1V level―commercial AC strains, batteries, and different universal assets now not suffice. New applied sciences additionally require complicated concepts to guard opposed to typical and artifical failures. nonetheless, regardless of its significance, useful details in this serious topic continues to be tough to find.

Using basic, obtainable language to stability assurance of theoretical and sensible elements, DC strength provides, energy administration and Surge Protection info the necessities of strength electronics circuits appropriate to low-power structures, together with smooth transportable units. A precis of underlying ideas and crucial layout issues, it compares educational learn and courses and reports DC energy provide basics, together with linear and low-dropout regulators. content material additionally addresses universal switching regulator topologies, exploring resonant conversion approaches.

Coverage comprises different very important themes such as:

  • Control facets and keep an eye on theory
  • Digital regulate and keep an eye on ICs utilized in switching regulators
  • Power administration and effort efficiency
  • Overall strength conversion degree and easy defense concepts for larger reliability
  • Battery administration and comparability of battery chemistries and charge/discharge management
  • Surge and temporary safeguard of circuits designed with sleek semiconductors in response to submicron measurement transistors

This really good layout source explores appropriate primary parts of energy assets, with quite a few stated references and dialogue of industrial parts and brands. despite their past event point, this knowledge will enormously reduction designers, researchers, and lecturers who, learn, layout, and convey the workable new strength resources had to propel our smooth digital world.

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Additional info for DC Power Supplies: Power Management and Surge Protection for Power Electronic Systems

Sample text

A comprehensive account of these technologies is available in [4]. 2 Reverse-Biased Diode-Based Voltage References The most common and simple way to achieve a reference source is to use a reversebiased diode, or a zener diode as it is commonly called, where it enters into a voltage breakdown region. A zener diode has two distinctly different breakdown mechanisms: zener breakdown and avalanche breakdown. The zener breakdown voltage decreases as the temperature increases creating a negative temperature coefficient (TC).

Transistors are used. 12(c) indicates the feedback loop arrangement with an error amplifier, which could be easily implemented by using an op-amp. 13(a) comprises an error amplifier that has the output voltage of V X and gain of AEA. 13(b). 38) where APT = g mrop , β= RY , RX + RY and RX + RY >> RL . Therefore Vo = VB APT β V A A β + REF PT EA . 1 Dropout Voltage This is the minimum voltage difference allowed for the series pass element before the regulator goes out of regulation. Usually a PMOS transistor-based version allows very low value and hence a high efficiency.

Control circuit characteristics directly affect system bandwidth and the achievable DC regulation. The voltage reference is used for comparison of the output voltage in the control circuit, and primarily governs the steady-state accuracy of the device. The control circuit can be based on an op-amp or a circuit designed with discrete components. This directly governs the output transient response and the stability of the output. More on this will be discussed later. In general the designer should be conscious of the power consumption of the control circuits to get the best efficiency.

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