1. Safety

Isolated DCDC power module refers to the isolated power supply, which uses a transformer to reduce various voltages (such as 220VAC, 48VDC, 24VDC, 12VDC, etc.) to the required voltage through the transformer, and then uses it as a load power supply. The non isolated power supply module is to directly introduce various voltages (such as 220VAC, 48VDC, 24VDC, 12VDC, etc.) 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 is no isolated device such as transformer in the middle, so it is called the non isolated power supply module. As a product that can be used safely by end users, engineers generally consider the insulation and isolation reliability of the system when designing power supply schemes. In contrast, DC isolated power module is safer than non isolated power module.

2. Efficiency

The efficiency of non isolated power modules is generally high because they lack the energy lost by the magnetoelectric conversion of voltage transformation. The efficiency of non isolated power modules of most power manufacturers in the industry can reach more than 91%. In contrast, the efficiency of DC isolated power modules is generally below 88%, so the heating of DC isolated power modules is relatively larger than that of non isolated power modules.

3. Cost and volume

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

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 DC isolated power module is 30-42v, and the load range of non isolated power module can be 30-84v. When selecting power supply, many manufacturers require that the power supply can adapt to the full voltage input of 90-265v for the overall adaptability, and the load range is also required to be as high as 84v. Such selection has certain risks and hidden dangers. When 90V is input, the power supply may lose the constant current function. Thd non isolation is suitable for high-voltage low current, and the cost of high current is not cheaper than isolation.