Power electronics and motor drives: advances and trends by Bimal K. Bose

By Bimal K. Bose

Energy electronics is a space of very important and swiftly altering expertise. Technological developments within the quarter give a contribution to functionality development and price aid, with functions proliferating in business, advertisement, residential, army and aerospace environments. This booklet is intended to aid engineers working in some of these parts to stick up to date at the most up-to-date advances within the box, in addition to to be a automobile for clarifying more and more complicated theories and arithmetic. This booklet can be an economical and handy approach for engineers to get up-to-speed at the most modern tendencies in strength electronics.

The reader will receive an analogous point of informative guideline as they might if attending an IEEE direction or a coaching consultation, yet with no ever leaving the workplace or front room! the writer is in a superb place to supply this guide as he teaches many such classes.

* Self-learning complicated instructional, falling among a standard textbook and a pro reference.
* virtually each web page positive factors both a close determine or a bulleted chart, observed by way of transparent descriptive explanatory text.
* The significant other web site comprises figures as PowerPoint shows, so the reader can stick with alongside on his or her domestic machine

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Extra info for Power electronics and motor drives: advances and trends

Sample text

As reverse voltage is applied in the forward conduction, the current decreases linearly (due to leakage inductance), reverses, and then turns off with a snap. High di/dt at turn-off causes a reverse voltage (Vrrm) that is higher than the applied voltage (VR). The recovery charge Qrr and the corresponding recovery time trr are important diode parameters. Diodes are classified as slow-recovery diodes, fast-recovery diodes, and Schottky diodes. The former two types have P-I-N geometry, whereas the last type has a metal–semiconductor junction.

In the log-log graph, the dc collector current and peak collector current at saturated condition are indicated on the vertical axis. Similarly, peak collector voltage is indicated on the horizontal axis. The safe active operating area can be exceeded over the dc limit area if the device is switched on a duty-cycle basis. The first negative slope represents the thermal limit junction power dissipation curve, which is dictated by the maximum junction temperature (Tj). The second and third slopes, which operate at higher collector voltage, are limited by the second breakdown effect.

The buck or step-down chopper can control the dc voltage at output by duty cycle control operation. The load freewheeling diode (FWD) circulates the load inductive current when the GTO is off. The circuit is shown with a turn-on snubber inductance (LL) and turn-off RCD polarized snubber. When the device is turned on by a gate pulse, the turn-on current di/dt is slowed down by LL, which also reduces turn-on switching loss. The snubber capacitor CS, which is initially charged to supply voltage, starts discharging to RS through the snubber leakage inductance LS and the device.

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