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Pulse Width Modulated (PWM) Power Supplies, Volume 45 [Kõva köide]

(Florence, Italy)
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Analyzes a particular type of power source: the switching mode power supplies that utilize the Pulse Width Modulation technique to operate, used to feed the electronic boards of most modern equipment. Provides designers of such power supplies with an overview of the interdisciplinary design methods. The arrangement is by function the input stage, the flyback converter, etc. with a final chapter explaining the relation between them and the underlying theory. No index. Annotation copyright Book News, Inc. Portland, Or.

A restricted source of power supply is analysed in this book - namely the switching mode power supplies (SMPS), which utilise the Pulse Width Modulation (PWM) technique to operate. Even though restricted, such a class of power supply is vital to circuits as most of modern electronic equipment is dependant on this form of technology to feed electronic boards. Its main advantages are greater efficiency, and its minimum physical size and weight.


Interdisciplinary knowledge such as circuit theory, semiconductor devices theory and technology, magnetics theory and technology, linear and nonlinear control theory is involved in the design of an SMPS.


This volume provides designers with an in-depth overview on the latest interdisciplinary methods involved in the design of switching mode power supplies, providing the reader with a tool whereby the learning time can be reduced and information about switching mode power supplies design processes can be easily accessed. The book adopts a systemic approach, subdividing the information into functional blocks whose properties and relationships are evaluated and compared with each other. A comprehensive list of references to the literature is given thus enabling the reader to follow up on more detail.


A restricted source of power supply is analysed in this book - namely the switching mode power supplies (SMPS), which utilise the Pulse Width Modulation (PWM) technique to operate. Even though restricted, such a class of power supply is vital to circuits as most of modern electronic equipment is dependant on this form of technology to feed electronic boards. Its main advantages are greater efficiency, and its minimum physical size and weight.


Interdisciplinary knowledge such as circuit theory, semiconductor devices theory and technology, magnetics theory and technology, linear and nonlinear control theory is involved in the design of an SMPS.


This volume provides designers with an in-depth overview on the latest interdisciplinary methods involved in the design of switching mode power supplies, providing the reader with a tool whereby the learning time can be reduced and information about switching mode power supplies design processes can be easily accessed. The book adopts a systemic approach, subdividing the information into functional blocks whose properties and relationships are evaluated and compared with each other. A comprehensive list of references to the literature is given thus enabling the reader to follow up on more detail.

1. The Power Supply System. Power supply parameters. Linear vs.
switching power supplies. Voltage mode, voltage feedforward, current mode.
2. The Input Stage. The basic ac/dc converter. Bulk capacitor sizing. The
computation of ton. The inrush current problem. The bridge diodes sizing. The
power factor. The EMI problem. EMI filtering.
3. The Flyback Converter.
Output voltage computation. Computation of Dmax. Computation of Lp.
Comparison between DM and CM. The transformer. Sizing of the core.
Computation of the secondary winding number of turns, Ns. Parasitic
interactions between the switching transistor and the transformer. Transient
switchings. D-phase power losses in the MOSFET. Resultant waveforms. MOSFET
transistor sizing. Output diode.
4. The Forward Converter. Output voltage
computation. Computation of Dmax. The transformer. Parasitic interactions
between the switching transistor and the transformer. Output and
demagnetization diodes.
5. The Push-Pull Converter. Output voltage
computation. The "volt-seconds" problem. The transformer. Semiconductor
switch. Output diodes. The "half bridge" variant. Computation of the half
bridge's capacitances. Cascaded push-pull.
6. The Output Stage. The filter
capacitor. The C filter. The LC filter. The coupled inductor. Comparison
"Independent inductors vs. coupled inductor". Design conclusions.
Postregulators. Magnetic amplifier. Desaturation of the magnetic amplifier.
The magnetic amplifier's control-to-output transfer function. The mag amp's
delay problem. Mag amp compensation.
7. SMPS Control Theory. Electrical
circuits modelling. Calculation of the transfer function. Frequency response.
Control targets. Controller design. Conclusions. Compound excitation signals.
Switching networks. Control techniques. Voltage mode techniques. Input
voltage feedforward control. From voltage mode to current mode: the
conductance control. Conductance control loop analysis. Voltage mode loop
analysis. Current mode: the peak current control. Slope compensation. Control
loop insulation by optocouplers. The right half plane zero. Output impedance
computation. References.