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首页> 外文会议>International Conference on Circuits, System and Simulation >Efficiency improvement of dual mode DC-DC buck converter under light load using PTWS with a zero current detector
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Efficiency improvement of dual mode DC-DC buck converter under light load using PTWS with a zero current detector

机译：使用PTW具有零电流检测器的轻负载下双模DC-DC降压转换器的效率改进

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This paper presents a dual-mode DC-DC buck converter using power transistor width scaling (PTWS) with a zero current detector to improve power efficiency under light load. The buck converter is operated in a dual mode, combining the switching frequency modulation (SFM) mode which uses the voltage controlled oscillator (VCO) under light load, with the PWM mode for heavy load. To enhance power efficiency under light load a PTWS scheme is employed, in which the inductor current is detected using a zero current detector (ZCD) and then used to select the gate size of the power switching transistor. The proposed circuit was designed using a Magnachip 0.35μm CMOS process. Simulation results shows that our proposed converter has 81.3% ~ 93% power efficiency for output load currents of 10mA ~ 250mA, which is a 5.3% improvement compared to a simple SFM-PWM dual mode and an 8.9% improvement compared to a PWM-only mode under a light load of 10mA, respectively.
机译：本文采用双模DC-DC降压转换器，采用电源晶体管宽度缩放（PTW），具有零电流检测器，以提高轻负载下的功率效率。降压转换器以双模式运行，组合在轻负载下使用电压控制振荡器（VCO）的开关频率调制（SFM）模式，PWM模式为重负载。为了提高光负荷下的功率效率，采用PTWS方案，其中使用零电流检测器（ZCD）检测电感电流，然后用于选择电源开关晶体管的栅极尺寸。所提出的电路使用Magnachip0.35μmCMOS工艺设计。仿真结果表明，与简单的SFM-PWM双模相比，我们所提出的转换器具有81.3 ％〜93 ％功率效率，用于输出负载电流为10mA〜250mA，这是5.3 ％的改进，与简单的SFM-PWM双模和8.9 ％改进相比仅在10mA的轻负载下的仅PWM模式。

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