A buck converter is a step-down DC to DC converter. Its design is similar to the step-up boost converter, and like the boost converter it is a switched-mode power supply that uses two switches (a transistor and a diode), an inductor and a capacitor.
The simplest way to reduce the voltage of a DC supply is to use a linear regulator (such as a 7805), but linear regulators waste energy as they operate by dissipating excess power as heat.
Power Electronics is the technology associated with efficient conversion, control and conditioning of electric power from its available input into the desired electrical output form. The field of the book is concerned of electrical power processing using electronic devices the key component of which is a switching power converter.
Power Conversion Circuits and Diodes
6.002 Fall 2000
.Power Conversion Circuits (PCC)
+ – 5V DC
solar cells, battery
+ – 5V DC
DC-to-DC UP converter Power efficiency of converter important, so use lots of devices: MOSFET switches, clock circuits, inductors, capacitors, op amps, diodes
Reading: Chapter 16 and 4.4 of A & L.
6.002 Fall 2000 Lecture 24
.First, let’s look at the diode
+ vD –
v ⎛ VD ⎞ ⎜ e T − 1⎟ iD = I S ⎜ ⎟ ⎠ ⎝ I S = 10 −12 A
VT = 0.
The HCMOS MC68HC11A8 is an advanced 8-bit microcontroller (MCU) with highly sophisticated on-chip peripheral capabilities. A fully static design and high-density complementary metal-oxide semiconductor (HCMOS) fabrication process allow E-series devices to operate at frequencies from 3 MHz to dc, with very low power consumption.
Creation of the Converter, A Case Study DC Motor Drive, Verification of the Design, Improvements on PCB Version,... as the main contents of the document "Design of a Switch-Mode Power Electronic Converter for Teaching Laboratory". Invite you to refer to the lecture content more learning materials and research.
Power electronics is the technology of processing and controlling the flow of electric energy
by supplying voltages and currents in a form that is optimally suited to the end-user’s
requirements .Atypical block diagram is given in Figure 1.1 . The input power can be
either AC and DC sources. A general example is one in which the AC input power is from
the electric utility. The output power to the load can be either AC and DC voltages. The
power processor in the block diagram is usually called a converter. Conversion technologies
are used to construct converters.
Điện tử công suất đã trở thành một phân ngành đóng vai trò quan trọng bậc nhất
trong công nghiệp và không dừng lại ở đó, ngày càng thâm nhập sâu vào cuộc sống qua
các ứng dụng đột phá trong dân dụng. Cùng với sự phát triển không ngừng của các
nghành điện tử và các ngành khoa học khác, điện tử công suất đã và đang đạt được
những thành tựu mới to lớn.
AC/DC I/O interface. A discrete interface that converts alternating current (AC) voltages from field devices into direct current (DC) signals that the processor can use. It can also convert DC signals into proportional AC voltages. action. A set of control instructions prompting a PLC to perform a certain control function during the execution of a sequential function chart step. acyclic message. An unscheduled message transmission. A/D. See analog-to-digital converter. address. (1) The location in a computer’s memory where particular information is stored.
AC motors convert AC electrical energy to Mechanical energy. AC motors:
the armature of rotor is a magnet (different to DC motors).
the stator is formed by electromagnets (like in DC motors). Effects of AC Supply on Magnetic Poles Consider the rotor to be a permanent magnet.
Current flowing through conductors energize the magnets and develop N and S poles.
The strength of electromagnets depends on current.
First half cycle current flows in one direction.
Second half cycle it flows in opposite direction...
Electric DC machines, as indeed any other type of electric machine, can be used to either produce electric energy from the input mechanical energy, or to convert electric energy into output mechanical energy. These two possible operating regimes are called generation and motoring.
Recent progress in information technology, wireless communication, biotechnology
and microelectronics requires advanced technologies and new magnetic materials to
meet demands of modern devices. This collection of eight chapters provides an up‐todate
review of recent trends and developments in technology, characterization
methods, theory and applications of modern magnetic materials with original, never
published contributions from the renowned scientists in the field of magnetism.
The switching regulator is increasing in popularity because it offers the advantages of higher power conversion efficiency and increased design flexibility (multiple output voltages of different polarities can be generated from a single input voltage). This paper will detail the operating principles of the four most commonly used switching converter types: Buck: used the reduce a DC voltage to a lower DC voltage. Boost: provides an output voltage that is higher than the input. Buck-Boost (invert): an output voltage is generated opposite in polarity to the input....
This book also covers: Analysis of converters used in electric drive systems, as well as DC, induction, and brushless DC motor drives; detailed treatment of supervisory down to switch level converter controls, nonlinear average value modeling of converters and drive systems, operational impedances and reduced-order modeling, guidelines for computer simulation of machines and drive systems.
Since the first edition of Analysis of Electric Machinery was published, the reference frame theory that was detailed in the book has become the universally accepted approach for the analysis of both electric machines and electric drive systems. Now in its second edition, Analysis of Electric Machinery and Drive Systems presents, in one resource, the application of this theory to the analysis, simulation, and design of the complete drive system including the machine, converter, and control.
Electrical consumption, especially direct or variable frequency currents, has
strongly increased over 50 years in industry. This situation explains the growth of
At the beginning, when rectifiers replaced DC machines, only diodes and
thyristors were used. Then power transistors appeared and enabled the extension of
smaller power applications for domestic use. New research topics were developed
around converters and power devices.
Oscillator circuits are used for generating the periodic signals that are needed in various applications. These circuits convert a part of dc power into the periodic output and do not require a periodic signal as input. This chapter begins with the basic principle of sinusoidal oscillator circuits. Several transistor circuits are subsequently analyzed in order to establish their design procedures.
Biochemical Basis of Megaloblastic Anemia The common feature of all megaloblastic anemias is a defect in DNA synthesis that affects rapidly dividing cells in the bone marrow. All conditions that give rise to megaloblastic changes share in common a disparity in the rate of synthesis or availability of the four immediate precursors of DNA: the deoxyribonucleoside triphosphates (dNTPs): dA(adenine)TP and dG(guanine)TP (purines), dT(thymine)TP and dC(cytosine)TP (pyrimidines).