Power Electronic Devices

Mar 22, 2025#study37

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The document discusses power electronic devices, categorizing them into main circuits that handle energy conversion or control tasks and the devices themselves that facilitate this process. It outlines concepts related to power losses in these devices, including conduction losses, cutoff losses, and switching losses, with conduction losses being the primary contributor. The classification of power electronic devices is based on the degree of control: 1. **Half-controlled devices** (e.g., thyristors) can be turned on by a control signal but cannot be turned off by it. 2. **Fully-controlled devices** can be both turned on and off by control signals. 3. **Uncontrolled devices** (e.g., power diodes) have no control signals and operate based solely on the voltage and current in the main circuit.

Power Electronic Devices#

The beginning mentions that this part relates to power electronic devices, divided into:
Main circuit => The circuit that directly undertakes the task of converting or controlling electrical energy.
Power electronic devices => Electrical devices that realize the conversion or control of electrical energy.
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Losses in Power Electronic Devices:#

Conduction Loss - Cut-off Loss - Switching Loss

Conduction loss is the main reason for power loss in devices;
when the switching frequency is high, switching loss becomes the main reason;

Classification of Power Electronic Devices#

Classified by the degree of control over the device
Semi-controlled devices can be controlled to conduct through a control signal but cannot be controlled to turn off. For example, thyristors.
Fully controlled devices can control both their conduction and cut-off. These are self-turn-off devices.
Uncontrolled devices
Power Diode, which has only two terminals and cannot be controlled by a control signal to turn on or off, does not require a driving circuit^[externally voltage-driven], and the conduction and cut-off of the device are entirely determined by the voltage and current it bears in the main circuit.

Power Electronic Devices

Power Electronic Devices#

Related Concepts of Power Electronic Devices#

Losses in Power Electronic Devices:#

Classification of Power Electronic Devices#