Research on Design Technology of High Efficiency Boost DC-DC Converter with Wide Load Range

Mengli Li; Tianhao Li; Lili Li

doi:10.6911/WSRJ.202503_11(3).0014

Authors

Mengli Li
Tianhao Li
Lili Li

DOI:

https://doi.org/10.6911/WSRJ.202503_11(3).0014

Keywords:

DC-DC switching power supply; over-zero detection; PWM/PSM automatic switching; high efficiency.

Abstract

In order to solve the problem of low conversion efficiency of traditional DC-DC switching power supply under light load, this paper adopts the combination of zero crossing detection technology and pulse width modulation (PWM)/skip period modulation (PSM) automatic switching technology through in-depth study of the source of power loss. The conversion efficiency under different loads is improved. On the one hand, through the zero crossing detection technology, when the inductance current drops to zero, the intermittent current tube is turned off in time to prevent the current from flowing back to the power supply and causing energy loss; On the other hand, PSM is used to skip part of the cycle to reduce the working frequency, that is, to reduce the switching loss and drive loss, improve the conversion efficiency of the system, and solve the problem of low efficiency of DC-DC switching power supply at light load. Based on the 0.18 μm BCD process completes the physical implementation and test verification of the proposed method. The test results show that when the input voltage is 3.7 V and the output voltage is 4.6 V, the system can achieve smooth switching between PWM mode and PSM mode, and can timely turn off the intermittent current tube when the inductance current crosses zero. The highest efficiency can reach 97% and the lowest efficiency can reach 92.22% in the full load range of 10 mA-900 mA.

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