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开关电源需要适应不同开关频率的要求。作为保证电流模DC-DC变换器环路稳定的重要部分,斜坡补偿电路也需要满足这一要求。基于峰值电流模控制(PCMC)的降压型DC-DC变换器,阐述了斜坡补偿的原理和多种斜坡补偿方案,设计了能够自适应开关频率的二次斜坡补偿电路。在0.35μm BCD工艺下,对不同工作频率下的斜坡补偿电路和整体电源电路进行了仿真验证。结果表明,在全频率范围内没有出现次谐波振荡和过补偿现象,电路工作稳定。该斜坡补偿电路适用于开关频率可调的开关电源领域。
Switching power supply needs to adapt to different switching frequency requirements. As an important part of ensuring the loop stability of the current mode DC-DC converter, the slope compensation circuit also needs to meet this requirement. Based on the peak current mode control (PCMC) step-down DC-DC converter, the principle of slope compensation and various slope compensation schemes are expounded. A secondary slope compensation circuit is designed to adapt the switching frequency. Under the 0.35μm BCD process, the slope compensation circuit and the overall power circuit under different operating frequencies are simulated and verified. The results show that subharmonic oscillation and overcompensation are not observed in the whole frequency range, and the circuit is stable. The slope compensation circuit is suitable for the switching frequency adjustable switching power supply.