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开题报告表格 西南科技大学毕业设计（论文）开题报告

The NCP1351 is a current-mode controller targeting low power off-line flyback Switched Mode Power Supplies (SMPS) where cost is of utmost importance. Based on a fixed peak current technique (quasi-fixed TON), the controller decreases its switching frequency as the load becomes lighter. As a result, a power supply using the NCP1351 naturally offers excellent no-load power consumption, while optimizing the efficiency in other loading conditions. When the frequency decreases, the peak current is gradually reduced down to approximately 30% of the maximum peak current to prevent transformer mechanical resonance. The risk of acoustic noise is thus greatly diminished while keeping good standby power performance.

开关稳压电源被誉为高效节能电源，代表着稳压电源的发展方向，现已成为稳压电源的主流产品，目前，开关电源正进入一个蓬勃发展的新时期。