Many people are unsure what a switching power supply is, often assuming it’s similar to a linear one without understanding the differences or underlying principles. Additionally, when a switching power supply malfunctions, they may not know where to find specialized repair vendors. Below, we’ll explain the basic principles of a switching power supply.
What is a Switching Power Supply?
The commonly heard term “switch mode power supply” (SMPS) refers to a switching power supply. Essentially, it converts power into the necessary voltage and current through various forms. The input power can be divided into two types: alternating current (AC), like household electricity, and direct current (DC), like car chargers.
Switching power supplies operate by using pulse width modulation (PWM) control. They store and convert power through magnetic components by switching between saturation and cutoff states. This results in favorable electrical characteristics; in terms of size and weight, switching power supplies are lighter and more compact than linear power supplies, making them highly portable.
Switching Power Supply vs. Linear Power Supply
| Category | Switching Power Supply | Linear Power Supply |
|---|---|---|
| Efficiency | High | Low |
| Stability | Moderate | High |
| Hold-up Time | About 16ms | About 1ms |
| Circuit Design | Complex | Simple |
| Size & Weight | Small & Light | Large & Heavy |
Applications of Switching Power Supplies
Switching power supplies are now widely used in the SMPS market and can be broadly categorized into six sectors:
- Computing Industry: Laptops and peripherals
- Telecommunications: Network, data, and communication devices
- Consumer Electronics: Consumer devices like smartphones
- Industrial and Test Instruments: Medical and industrial-related equipment
- Military and Aerospace: Upgrading outdated equipment
- Other Related Sectors: Outdoor lighting equipment, car chargers
Switching Power Supplies｜Development Trends and Current Status in Taiwan
Domestically manufactured switching power supplies (SMPS) are mainly applied to communications, computers, and related accessories. With Taiwan’s advancing information industry, SMPS production has reached a global leading position. Raw materials primarily consist of ICs, semiconductors, magnetic components, capacitors, electronic components, casings, and printed circuit boards.
The U.S. and Japan supply ICs and power semiconductors, while Taiwan can produce other materials domestically. With downstream industries like PCs, electronics, and communications, switching power supplies are tapping into extensive commercial and application opportunities. As demand for portability grows, the trend is toward reducing the size of switching power supplies to enhance product value and competitiveness.
Do you have a deeper understanding of switching power supplies after this explanation? Founded in 1972, PHIHONG is a world-renowned leader in power supply manufacturing, trusted by prominent clients worldwide. PHIHONG remains dedicated to developing and producing high-efficiency power products that meet stringent quality and safety standards. Contact us to explore partnership opportunities and learn more about our power supply solutions.