Why high voltage input or output DC-DC Converter cannot use non-isolated design

A high-voltage DC-DC Converter refers to a converter with input or output voltage higher than 100V, commonly used in fields such as electronic equipment, medical devices, and industrial automation. Due to the inherent dangers of high voltage, safety considerations are crucial when using high-voltage power supplies. To ensure both safety and stability, only isolated power modules should be employed.

1. Hazards of High-Voltage Power Supplies: High voltage produced by these power supplies poses a significant risk to human safety. Furthermore, there is a potential for current backflow and voltage leakage, which can damage circuits or lead to safety hazards like fires. Therefore, strict attention must be paid to safety measures while using high-voltage power supplies, including appropriate protective measures.
2. Advantages of Isolated Power Modules: Isolated power modules utilize an isolation transformer to separate the input voltage from the output voltage, ensuring circuit safety and stability. On the other hand, non-isolated power modules do not employ an isolation transformer and directly convert the input voltage to the output voltage. As a result, non-isolated power modules exhibit energy losses during conversion and are susceptible to interference and crosstalk between components, potentially impacting their efficiency and stability.

Also Read: Advantages of Non-isolated DC-DC Converter

3. The use of isolated power modules is necessary when dealing with high-voltage power supplies due to safety, stability, and technical requirements. Here are the reasons why isolated power modules are preferred:
4. Security Considerations: High voltage generated by high-voltage power supplies poses significant safety risks. Isolated power modules effectively prevent issues like current backflow and voltage leakage, ensuring the circuit’s safety and preventing potential damage or accidents. Non-isolated power modules lack these safety features, increasing the risk to circuits and overall safety.
5. Stability Concerns: Stability is paramount when working with high-voltage power supplies. Isolated power modules help reduce interference and crosstalk between components, enhancing circuit stability and reliability. Conversely, non-isolated power modules are prone to interference and crosstalk, compromising their stability and reliability in high-voltage applications.
6. Technical Requirements: High-voltage power supplies come with specific technical requirements that must be met for safe and reliable operation. Isolated power modules are designed to meet these technical requirements, ensuring compatibility with high-voltage power supplies and maintaining circuit safety and stability. Non-isolated power modules may not meet the technical specifications of high-voltage applications, leading to compromised safety and stability.