Differences Between Non-Isolated and Isolated Power Supplies in LED Lighting

LED lighting has become increasingly popular because of its energy efficiency and long lifespan. However, when it comes to the power supply for LED lights, there are two main types: non-isolated and isolated power supplies. This article explores the differences between these two types of power supplies and their implications in LED lighting applications.


Non-Isolated Power Supply: A non-isolated power supply, also known as a buck converter, does not provide electrical isolation between the input and output sides. This means that the input and output currents share a common ground reference.

Isolated Power Supply: An isolated power supply, also known as a flyback converter, provides electrical isolation between the input and output sides. It uses a transformer to transfer energy from the input to the output, ensuring galvanic isolation.

Differences Between Non-Isolated and Isolated Power Supplies:

  1. Electrical Isolation:

The main difference between non-isolated and isolated power supplies is that isolated power supplies offer electrical isolation between the input and output sides. This isolation eliminates the direct electrical connection between the input and output, providing safety benefits and reducing the risk of electric shock.

  1. Voltage Regulation:

Non-isolated power supplies are typically used for low-power LED lighting applications. They usually operate with a fixed output voltage, making them simpler and cost-effective. On the other hand, isolated power supplies offer better voltage regulation and can be used in high-power LED lighting applications. They can provide regulated and stable output voltage even with varying input voltage or load conditions.

  1. Noise and Interference:

The electrical isolation provided by isolated power supplies helps to reduce the transmission of noise and interference from the input side to the output side. This is particularly important in LED lighting applications where radio frequency interference (RFI) or electromagnetic interference (EMI) can affect the performance of other sensitive electronic components.

  1. Safety and Protection:

Isolated power supplies are often preferred in LED lighting applications where safety is a concern. The isolation barrier prevents direct contact with the high-voltage input, reducing the risk of electrical shock. Additionally, isolated power supplies provide better protection against overvoltage, overcurrent, and short circuits, improving the reliability and lifespan of the LED lighting system.

  1. System Design and Efficiency:

Non-isolated power supplies are simpler in design and have fewer components, making them cost-effective for low-power LED lighting applications. However, they may have lower efficiency compared to isolated power supplies, as they are not suitable for high-power applications. Isolated power supplies offer higher efficiency and more flexibility in system design, but they tend to be more complex and expensive.

AIKO’s power supplies all use isolated power supplies. Isolated power supplies provide electrical isolation, better voltage regulation, increased safety and protection features.

For more information, please contact us.


Email: info@aikoled.com

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