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How is the efficiency comparison between forward switching power supplies and flyback switching power supplies?

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.03.27
In modern electronic devices, switch mode power supplies play a crucial role as key components for energy conversion. Forward switching power supplies and flyback switching power supplies are two common topology structures that exhibit their respective advantages in different application scenarios.


Forward Switching Power Supply




Flyback Switching Power Supply

Forward switching power supplies are usually suitable for applications with high power and high output voltage. For example, in industrial equipment, server power supplies, and other situations that require stable high voltage output. The forward switching power supply has high efficiency, can provide larger output power, and has good stability in output voltage.

Taking PLC (Programmable Logic Controller) in industrial automation as an example, forward switching power supply can provide stable power support. PLC usually requires reliable high-voltage power supply to ensure the normal operation of the system. The forward switching power supply can meet this requirement, ensuring the stability and reliability of the PLC.

Flyback switching power supplies are more suitable for low-power, multi output, or isolated power applications. For example, in the fields of consumer electronics, communication devices, etc. The flyback switching power supply has a relatively simple structure, low cost, and can achieve multiple outputs, so it has significant advantages in these applications.

Taking smartphone chargers as an example, flyback switching power supplies are often used. Mobile phone chargers need to provide different voltage charging circuits for the phone simultaneously, such as 5V for charging and 3.3V for supplying internal circuits of the phone. The flyback switching power supply can easily achieve multiple outputs to meet the charging needs of mobile phones.

In addition, in some situations that require isolated power sources, such as medical equipment, laboratory instruments, etc., flyback switching power supplies can also play an important role. It can effectively isolate the input and output terminals, providing a safe and reliable power supply.

However, it should be noted that the choice in practical applications does not solely depend on the topology itself. Other factors need to be considered, such as cost, efficiency, size, heat dissipation, etc. When designing switch mode power supplies, engineers will conduct a comprehensive evaluation based on specific application requirements and select the most suitable solution.

In summary, both forward switching power supplies and flyback switching power supplies have their own advantages in practical applications. Understanding their characteristics and usage scenarios can help us better choose suitable switching power supplies to meet the power needs of different devices and systems.
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