9904-149 | WOODWARD | High frequency switching power supply technology

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9904-149 | WOODWARD | High frequency switching power supply technology

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The development of 9904-149 switching power supplies has freed power supplies from bulky and inefficient variable voltage linear power supplies. However, with the development of electronic technology, many devices are moving towards portability and miniaturization, which requires power supply technology to move towards high-frequency development. Research has shown that the volume and weight of power supply products are inversely proportional to the square of the power supply frequency.

1) Miniaturization, lightweighting, and high power density of power electronic equipment

One of the development directions of power electronic equipment is miniaturization. 9904-149 reduces its volume and weight, and improves power density. For example, as the size of large-scale integrated circuits (VLSI) in microprocessors continues to decrease, the size of power supply is much larger compared to microprocessors. Therefore, new technologies must be adopted to reduce the volume and weight of switching power supplies. In the 20th century, people did a lot of work in improving the power density of switching power supplies. The miniaturization and weight reduction of switch mode power supplies are particularly important for portable electronic devices such as mobile phones and digital cameras. In order to achieve high power density in switch mode power supplies, it is necessary to increase the operating frequency of PWM DC/DC converters, thereby reducing the volume and weight of energy storage components in the circuit.

2) High frequency power electronics technology

Before 1980, the switching frequency of PWM DC/DC converters in 9904-149 switching power supplies was 20-50 kHz. Since 1980, increasing the switching frequency has become the most effective way to reduce the size of switching power supplies, while also improving the dynamic performance of switching power supplies. Nowadays, 0-500 kHz has become the standard switching frequency for switching power supplies with outputs below 100 W. The specially manufactured low-power switching power supply has a switching frequency of several megahertz.

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