Difference between isolated power module and non isolated power module

1. Safety

The isolated DCDC power supply module refers to the isolated power supply that uses a transformer to reduce the voltage of various voltages (such as 48VDC, 24VDC, 12VDC, etc.) to the required voltage through the transformer, and then uses it as the load power supply. The non isolated power supply module is to directly introduce various voltages into the electronic circuit, and then conduct voltage rise and fall output through the electronic components. The input and output are directly connected through the electronic components, and there are no isolation devices such as transformers in the middle. Therefore, it is called the non isolated power supply module. As a product that can be safely used by end users, engineers will generally consider the insulation and isolation reliability of the system when designing the power supply scheme. In contrast, DC and DC isolated power modules have higher security than non isolated power modules.

2. Efficiency

Since the non isolated power module has less energy lost by the magnetoelectric conversion of the transformer, the efficiency is generally high. The efficiency of the non isolated power module of most power supply manufacturers in the industry can reach more than 91%. In contrast, the efficiency of DC and DC isolated power modules is generally below 88%, so the heat generation of DC and DC isolated power modules is relatively larger than that of non isolated power modules.

3. Cost and volume

Since the non isolated power supply module does not need to use a transformer for electrical isolation between input and output, compared with the DC DC power supply module, the non isolated power supply module requires smaller volume, lower cost and less design difficulty with the same output power and the same output performance (such as output accuracy, load effect, dynamic response, etc.). If the design can consider that there is no isolation between the input and output, compared with the DC DC isolated power module, the non isolated power module can be used for the design, which can be said to be the first choice of the engineer.

4. Load range

The output load range of DCDC isolated power module is smaller than that of non isolated power module.

Generally speaking, the output load range of the DC DC isolated power module is 30-42v, and the load range of the non isolated power module can be 30-84v. Many manufacturers require that the power supply can adapt to the full voltage of 90-265v input and the load range is as high as 84v for the overall adaptability when selecting the power supply. There are certain risks and hidden dangers in such selection. When 90V is input, the power supply may lose the constant current function. Thd non isolation is suitable for high voltage and small current, and the cost of large current is not cheaper than that of isolation.