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CONTENTSAbstract

1.Choise of designing direction

1.1 The review of circuit solutions

.1.1 Three-phase rectifier with center tap

1.1.2 Three-phase regulated rectifier with center tap (LH=¥)

.1.3 Three-phase bridge regulated rectifier

.1.4 Non-symmetrical scheme of three-phase bridge rectifier

.1.5 Larionov’s scheme

1.2 The review of constructive solutions

1.2 Statement of problem

2.Principle of designed scheme operation

. Calculation of rectifier working on active-inductive load

. Construction of the device of literatureA Reference data of diodeB Reference data of throttleC Reference data of transformer

Appendix D Reference data of clamped connection

rectifier electronic converter

INTRODUCTION Electronic apparatus are referred to devices of a power electronics used in various systems and electric power supply sources, which serve for conversion of electrical energy with one parameters to electrical energy with other parameters. For example, conversion an alternating-current to a direct one (rectifiers); a dc to ac (inverters); alternating-current of one frequency to an alternating current of another frequency (frequency converters); a direct voltage (current) of one value to a direct voltage (current) of other value (a voltage (current) converters). Electronic devices for a filtration and stabilization of current and voltage are also referred to devices of power electronics. All set of forth-above devices are termed as converters.

The design procedure of low power converters differs from a design procedure of high-power converters die to specific features of these devices, but electromagnetic processes in them have the same character. Course designing on discipline « Bases o power electronics » puts the purpose obtaining of practical skills in calculation of power electronics converters explanatory note, development of designs and drawing up of engineering specifications of converting units. 1. CHOICE OF DESIGNING DIRECTION 1.1 The review of circuit solutions .1.1Three-phase rectifier with center tap

The latter kind of load should be considered as opposite electromotive force with inductance. The component element of complicated schemes of three - phased current rectifiers is a simple three - phased scheme with center tap, suggested by Mitkevich. In this scheme dispersion of transformer windings aren’t taken into account, that is available for small power rectifiers; also it is considered that valves and transformer are ideal. In idealized scheme commutation is realized instantaneously, at any time moment current is conducted only by one valve, anode of which has the most high potential. The durability of work of every valve is . The rectified voltage and current contain thrice-repeated pulsation by period.

1.1 - The three-phased rectifier with center tap by active-inductive load.

It should be mentioned that in three-phased rectifier with center tap there is such a phenomenon as steady-state magnetization of transformer core. It is one of the disadvantage of usage given scheme. three-phased current rectifiers for decreasing of rectified current alternative component there usually link up inductive smoothing filter in a series with load, inductance of which has definite value (LH). The work regime of such a scheme is:ra=0, La=0, 0


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