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为了提高开关电源全负载下的效率,尤其在轻载或空载下具有与满载相当的效率,本文提出一种绿色模式开关电源的控制芯片设计,使其能根据负载大小调节开关管工作频率:在满载或重载时,系统工作在固定的开关频率,此时采用传统的PWM控制方式;在轻载时,引入绿色模式模块来降低振荡器产生的振荡频率进而降低开关管的开关频率。而开关电源的效率会随着开关电源开关频率的降低而升高,主要是因为开关频率的降低会减少开关管的开关损耗和驱动损耗。在此该绿色模式控制方式基于一反激式峰值电流模式控制的开关电源上得以实现。芯片设计采用CSMC工艺,,仿真结果表明当负载在0A~1A的范围时效率提升最大可达31.9%。
In order to improve the efficiency of full-load switching power supply, especially with light load or no-load full load with considerable efficiency, this paper presents a green-mode switching power supply control chip design, enabling it to adjust the size of the load switch tube operating frequency: At full load or heavy load, the system operates at a fixed switching frequency. In this case, the traditional PWM control mode is adopted. At light load, the green mode module is introduced to reduce the oscillation frequency of the oscillator and thus the switching frequency of the switch tube. The efficiency of the switching power supply with the switching power supply switching frequency decreases and increases, mainly because the lower switching frequency will reduce the switch switching losses and drive losses. The green mode control is based on a flyback peak current mode control switching power supply. The chip design uses the CSMC process, the simulation results show that the maximum efficiency up to 31.9% when the load in the range of 0A ~ 1A.