1. The security

Isolated power module refers to the use of a transformer through a transformer (such as 48VDC, 24VDC, 12VDC, etc.) to reduce the voltage to the required voltage.  which is then used as a load source. The non-isolated power supply module directly introduces various voltages into the electronic circuit, and then boosts the output through the electronic components. The input and output are directly connected through the electronic components, and there is no isolation device such as transformer in the middle, which is called the non-isolated power supply module. As a product that can be safely used by end users, engineers usually consider the reliability of the insulation and isolation of the system when designing power supply solutions. In contrast, the isolated power module is safer than the non-isolated power module.

2.The efficiency of 

Due to the loss of energy shortage, variable voltage magnetoelectricity conversion efficiency of the isolated power supply module, generally higher, most power supply manufacturer in the industry of the isolated power supply module efficiency can reach more than 91%, compared with total isolation power supply module efficiency is lower than 88%, so the heat in the isolation power supply module than isolated power supply module of heating efficiency is much larger.

3. Cost and volume

Since the non-isolated power supply module does not need to use transformers for electrical isolation between input and output, compared with the power supply module, the output power is the same and the output performance is the same (such as output precision, load effect, dynamic response, etc.). The non-isolated power module is small in size, low in cost and easy in design. If the design can consider the input and output of the non-isolated power module, compared with the isolated power module, the use of non-isolated power module design, can be said to be the first choice of engineers.

4. Loading range

The output load range of the isolated power module is smaller than that of the non-isolated power module. In general, the output load range of the isolated power module is 30≤42V, and the output load range of the non-isolated power module is 30≤84V. When many manufacturers choose the power supply, in order to adapt to the overall adaptability, the power supply must adapt to the full voltage 90×265V input, the load range must reach 84V. This kind of choice has certain risk and hidden danger. At 90V input, the power supply may lose its constant current function. These non-isolating devices are suitable for high voltage, low current applications, and the high current cost is not lower than the isolation.

Power module and non-isolated power module have their own advantages, for different industries, different design requirements, for a long time, these two products have been closely related in the industry. However, with the improvement of the design level of the power module manufacturers, the volume and cost of the isolated power module are also decreasing. Therefore, many users prefer to use the isolated power module when using the isolated power module.