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The role of switching power supply inductance

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.05.24
The basic composition of switch mode power supply

Switching power supply is a high-efficiency power supply, which consists of input filtering capacitors, rectifier bridges, intermediate capacitor filtering Composed of PWM modulator, output stage, and feedback control circuit. Among them, The control signal of the PWM modulator is isolated through a high-frequency transformer, and the feedback control circuit further controls the PWM duty cycle by comparing the difference between the output voltage and the set value, achieving the stability of the power output voltage.


Inductance of high-power switching power supply

The role of switching power supply inductance

1. Filter power supply noise

In switching power supplies, inductance is mainly used to filter out noise in the power supply, including high-frequency noise and low-frequency noise. In switch mode power supplies, high-frequency noise mainly comes from PWM modulators, while low-frequency noise mainly comes from output loads and rectifier bridges. Inductance can filter high-frequency noise by limiting the rate of current rise. For low-frequency noise, inductance can filter it by limiting the rate of change of current.

2. Reduce fluctuations in power supply voltage

Switching power supplies can cause fluctuations in output voltage during operation due to changes in load and power input. And inductance can generate current in the inductance during power supply voltage fluctuations to maintain stable voltage output. At the same time, inductance can also limit the instantaneous power supply current and protect the switching transistor.

3. Improve the efficiency of switching power supplies

Inductors have the ability to store and release energy, which can reduce the energy loss of power sources. In switch mode power supplies, inductors can store energy in high-frequency transformers, and then reuse this energy to improve the efficiency and stability of the power supply.

Summary

Inductors in switching power supplies are important components that can filter out noise and voltage fluctuations in the power supply, while also improving the efficiency and stability of the power supply. In the design of switch mode power supplies, the selection of inductance and the design of parameters are very important. Only by selecting and designing inductance reasonably can the performance and reliability of switch mode power supplies be guaranteed.
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