POWER SEMICONDUCTOR SYSTEMS I Author: Ales Havel Phone number: 4287 Headquarters: E227 Web page:

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Presentation transcript:

POWER SEMICONDUCTOR SYSTEMS I Author: Ales Havel Phone number: 4287 Headquarters: E227 Web page:

Presentation contents  Main types of converters  AC-DC converters Single phase rectifiers Construction possibilities, wiring Load voltage and current waveforms Mathematics Neat examples Three phase rectifiers Construction possibilities, wiring Load voltage and current waveforms Mathematics Neat examples  DC-DC converters  DC-AC converters  AC-AC converters

Power converters  A power semiconductor converter is an electrical device for converting electrical energy.

Division of AC/DC converters  Properties of rectifiers  Number of input phases Single phase rectifiers Three phase rectifiers n – phase rectifiers  Number of pulses P = 1, 2, 3, 6…  Possibilities of output voltage control Without control Diode rectifiers Half-controlled rectifiers Diodes + Thyristors Full-controlled rectifiers Thyristors  Wiring Bridge rectifiers Node rectifiers

Half-wave single phase diode rectifiers Voltage Current Resistive load Inductive load

Half-wave single phase diode rectifiers Voltage Current R+L+D0 load R+L load

Half-wave single phase diode rectifiers Voltage Current R+C load R+V load

Two pulse diode rectifiers Voltage Current

Two pulse thyristor controlled rectifiers

Important mathematical relations Output to Input phase RMS voltage ratio p[-]U L / U 1 [-] Limit of load current continuity for resistive load p[-]α[°] The output AVG voltage of diode rectifier or thyristor rectifier with control angle α = 0°: The output AVG voltage of thyristor rectifier with control angle α. Condition 1: The load current must be continuous Condition 2: No parallel bypass diode on the load

Example 1- submission Calculate the output AVG voltage of the 2-pulse bridge controlled rectifier, if you know the following values: α = 60°, U 1 = 230V

Example 1- solution a) General calculation approach: b) Calculation utilizing the basic relation: c) Calculation utilizing the table values:

Example 1- question? How will change the output AVG voltage value if we use the bypass diode parallel to the load? Solution:

Six pulse thyristor controlled rectifiers

Thank You for your attention