High-frequency ripple noise originates from the high-frequency power switching converter circuit. In this circuit, the input DC voltage is subjected to high-frequency switching conversion by power devices, followed by rectification and filtering to achieve stable voltage output. The output end contains high-frequency ripples at the same frequency as the switching operation. The impact of these ripples on the external circuit primarily depends on the conversion frequency of the DC stabilized power supply, the structure and parameters of the output filter. Designing to increase the operating frequency of the power converter can reduce the filtering requirements for high-frequency switching ripples.
The purpose of high-frequency ripple suppression is to provide a path for high-frequency ripples. Common methods for analyzing 400Hz power sources include:
1. Enhance the operating frequency of the DC power supply to increase the high-frequency ripple frequency, which is beneficial for suppressing the output high-frequency ripple.
2. Increased output high-frequency filter can suppress output high-frequency ripple.
3. Utilizes multi-stage filtration.
