II. Core Components and Circuit Elements
- Power Electronic Switching Devices
A power electronic switching device is an integrated system of active, switchable power semiconductor drivers. Its primary function is to control power flow by switching on and off at high speeds. A key characteristic of an ideal power switch is its ability to dissipate very low or near-zero power, which is achieved by minimizing power loss during its ON and OFF states. These devices are selected based on their power handling capability (the product of their voltage and current ratings) rather than their power dissipation rate.
- Linear Circuit Elements
Linear circuit elements are components that exhibit a linear relationship between the current input and the voltage output.
| Element | Description | Measurement Unit | Key Formula / Principle |
| Resistor | A device that restricts the flow of electric current, converting electrical energy into other forms like heat or light. | Ohm (Ω) | R = ρ * (L/A) where ρ is resistivity, L is length, and A is cross-sectional area. |
| Capacitor | A device that stores electrical energy in an electric field. It consists of two conductive plates separated by a dielectric insulator. | Farad (F) | Stores electrical energy through charging and releases it through discharging. 1 Farad = 1 Coulomb/Volt. |
| Inductor | A device that stores electrical energy in a magnetic field. Its simplest form is a wire coil. | Henry (H) | Inductance is proportional to the number of loops and depends on the core material. |
| Transformer | A device that transfers electrical energy from one circuit to another, altering the voltage level through electromagnetic induction. | N/A | Operates based on Faraday’s law of electromagnetic induction. Consists of a primary winding, secondary winding, and a magnetic core. |
- Ancillary Devices
- Controllers: Receive electronic signals from a measured variable, compare them to a set point, and use digital algorithms to manage a process.
- Sensors: Measure constantly varying currents to provide feedback for control loops, ensuring smooth and accurate converter function.
- Filters: Analog circuits, either active or passive, used for signal processing to remove undesired frequencies from a signal.
- Electromagnetic Devices: Apply the principle of electromagnetism in technologies like motors, generators, and electric bells.