Power Electrical Engineering for Renewables | L2

A diode is what type of device?

Uncontrolled.

What type of device is uncontrolled?

Diode.

A thyristor is what type of device?

Half-controlled.

What type of device is half-controlled?

Thyristor.

A transistor is what type of device?

Fully-controlled.

What type of device is fully-controlled?

Transistor.

A converter consists of which two elements?

Power switching semiconductor + energy storage element.

What does the controller do?

Switches on/off the semiconducting devices in the converter.

What are two types of circuits that are present in power electronics?

Information circuit & power circuit.

What circuit interfaces between an information circuit and a power circuit?

A drive circuit.

A diode has how many terminals?

2

How are on/off states determined for a diode?

By power circuit.

A thyristor has how many terminals?

3

How is a thyristor turned on?

Control signal.

How is a thyristor turned off?

Power circuit.

A transistor has how many terminals?

3

How is a transistor turned on/off?

Control signal.

What semi-conductive device is this?

Diode.

What semi-conductive device is this?

Diode.

What is an N-type semi-conductor?

Electrons are the majority carriers.

What is a P-type semi-conductor?

Holes are the majority carriers.

An equilibrium junction creates a ____________ that results in ________.

charge separation, E (electric field)

In an equilibrium junction, E ________ diffusion of carriers.

stops

The equilibirum junction leads to what condition?

Thermal equilibrium.

What is characteristic of a reverse-biased PN junction?

Ve+ to n & Ve- to p

For a reverse-biased PN junction, what happens if you apply a voltage in circuit?

It will induce an applied electric field.

In a reverse-biased PN junction, do the applied electric field and the E-field within the space-charge region point in the same or opposite direction?

Same

Does the total magnitude of the reverse-biased PN electric field (E_T) increase or decrease compared to the thermal equilibrium value?

Increase

What is the resulting action of the forces in a reverse-biased PN junction?

Increased electric field holds back the holes and the electrons in their proper regions.

What is characteristic of a forward-biased PN junction?

Ve+ to p & Ve- to n

In a forward-biased PN junction, do the applied electric field and the E-field within the space-charge region point in the same or opposite direction?

opposite

Does the total magnitude of the forward-biased PN electric field (E_T) increase or decrease compared to the thermal equilibrium value?

decrease

What is the resulting action of the forces in a forward-biased PN junction?

Diffusion of charges begins and continues as long as a voltage is applied (to induce the required E-field).

What is the relevant meaning of diffusion of charges in a forward-biased pn-junction?

Current.

What is a benefit of a thyristor?

Used in very high power situations.

What semi-conductive device is this?

Thyristor.

What semi-conductive device is this?

Thyristor.

What semi-conductive device is this?

Transistor.

What semi-conductive device is this?

Transistor.