Difference between isolated power module and non isolated power module
2022-09-04

1. Security

Isolated DCDC power module refers to the isolated power supply that uses transformers to reduce the voltage of various voltages (such as 48VDC, 24VDC, 12VDC, etc.) to the required voltage through transformers, and then supplies power to the load. The non isolated power supply module directly introduces various voltages into the electronic circuit, and then performs voltage rise and fall 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, so it is called the non isolated power supply module. As a product that can be used safely 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 are more secure than non isolated power modules.

2. Efficiency

Because the non isolated power module has less energy lost by the magnetoelectric conversion of voltage transformation, its efficiency is generally high. The efficiency of the non isolated power module of most power manufacturers in the industry can reach more than 91%. In contrast, the efficiency of DC DC isolated power modules is generally below 88%, so the heating of DC 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 the same output power and the same output performance (such as output accuracy, load effect, dynamic response, etc.), smaller volume, lower cost and less design difficulty. If there is no isolation between input and output in the design, it can be said that it is the first choice of engineers to use non isolated power modules compared with DC isolated power modules.

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 the power supply to be able to adapt to the full voltage input of 90-265v and the load range as high as 84v for the sake of overall adaptability when selecting the power supply. Such selection has certain risks and hidden dangers. When 90V is input, the power supply may lose its constant current function. These non isolated THDS are suitable for high voltage and small current. The cost of making large current is not cheaper than that of isolation.