Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Power supply

The Analysis and Design of Dual Buck Switching Mode Power Supply

Author XuSiMing
Tutor SunLongJie
School Xi'an University of Science and Technology
Course Power Electronics and Power Drives
Keywords DC voltage converter Pulse width modulation Pulse Frequency Modulation High efficiency Low power consumption
Type Master's thesis
Year 2009
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With the growing popularity of portable electronic products , the DC voltage converter (DC-DC) chips are widely used. These products typically use a single battery-powered , energy limited , how to improve the conversion efficiency , reduce power consumption and extend battery life, and became a designer needs to consider the main problem . This graduation project proposed based on pulse width modulation (PWM) and pulse frequency modulation (PFM) mode , high- efficiency , low-power switching power supply DC voltage converter design method . Circuit load current is small (about lt ; 70mA ) load current (about gt; 70mA ) , the inductor current is continuous , the switching frequency of 2MHz Voltage PWM control operating modes ; discontinuous inductor current , a more small , the switching frequency of the peak current and voltage dual control of the PFM operating mode, to achieve a high conversion efficiency in the load current changes the range of 0 ~ 500mA . Chip using SMIC 0.35μm CMOS mixed-signal model design . The simulation and test results show that the circuit can realize a smooth transition between PWM and PFM mode power supply , as well as two modes , and has a better ability to load and linear regulator . Output voltage error of less than 4% of the soil , the maximum quiescent operating current of less than 18μA, maximum conversion efficiency of 90% . The paper first and second chapters discuss the switching power supply DC-DC regulator principle and control methods . The third chapter describes the system structure and the operating mode of the graduation design of the DC-DC converter . Chapter IV Intro design idea of the main circuit of the DC-DC converter module . Chapter 5 gives the the BUCK system simulation results .

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