skifteforsyninger

Skifteforsyninger, also known as switched-mode power supplies (SMPS), are electronic power supplies that use a switching regulator to convert electrical power. They are a widely used type of power supply due to their high efficiency and compact size compared to traditional linear power supplies.

The core principle behind a skifteforsyning is to rapidly switch a power source on and off, typically at a high frequency. This switching action, controlled by a feedback loop, regulates the output voltage or current. By switching, the power components are either fully on or fully off, minimizing power dissipation and thus increasing efficiency. Components like transistors act as high-speed switches, and inductors and capacitors are used for energy storage and filtering to smooth out the switched waveform into a stable DC output.

Skifteforsyninger can be designed to step up (boost), step down (buck), or invert voltage. Their efficiency can often exceed 80-90%, which is significantly higher than the 30-50% efficiency typical of linear power supplies. This high efficiency leads to less wasted heat, allowing for smaller and lighter designs.

Common applications for skifteforsyninger include personal computers, televisions, mobile phone chargers, and various industrial electronic devices. While generally reliable, they can sometimes generate electromagnetic interference (EMI) due to their high-frequency switching operation, requiring careful design and filtering to mitigate this.