一种带动态开关控制电路的开关式DC-DC转换器

Dynamic Width Controller for Switch Mode DC-DC Converter

该文设计了一种带开关宽度动态控制电路的开关式DC-DC转换器。该DC-DC转换器将芯片检测到的负载电流与芯片内部的参考电流进行比较,根据负载的大小动态选择最优的开关宽度和对应的开关驱动器,以减小DC-DC转换器在高频率、轻负载时的转换损耗,从而提高芯片的整体效率。芯片采用低功耗的电压-电流转换电路为开关宽度动态控制电路提供电流信息。为了保证芯片的安全工作,具有保护功能的电路被集成在芯片内部。芯片采用了标准的0.35μm CMOS工艺,实验结果显示,该文设计的电路可以实现DC-DC转换器的动态开关控制,在低负载时效率最大可提高6%。

A Dynamic Width Controller （DWC） for switch mode DC-DC converter is designed. Based on the comparison result of the sensed load current and the internal reference current, the controller can select the optimum switch width and drivers for the DC-DC converter according to the load current condition. The controller can improve the efficiency of DC-DC converter for high switching frequency and light load applications. The chip adopts a low power cost Voltage-Current Converter （VCC） to provide load current information for the DWC. To ensure the security of the chip＇s performance, protection circuits are also integrated. The chip is simulated and fabricated under standard 0.35 μm CMOS process. The experiment results show that the proposed circuit can achieve dynamic switch width control for the DC-DC converter, and the maximum efficiency improvement is 6%for light load condition.