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Study on the Digital Current Mode Control of Switching-Mode Power Supply

Author: ZhouGuoHua
Tutor: XuJianPing
School: Southwest Jiaotong University
Course: Power Electronics and Power Drives
Keywords: Switching Power Supply Digital control Peak current control Mean current control Single - edge modulation Dual - edge modulation
CLC: TN86
Type: Master's thesis
Year: 2007
Downloads: 762
Quote: 11
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Abstract


Compared with traditional analog control , digital control and better power management easy to implement , easy to interface with the digital system , easy to implement a variety of control algorithms without the need to change the hardware circuit . This thesis on the basis of the digital control , the digital current control techniques (including the digital peak current control and the digital current control mean ) conducted intensive research . Buck converter as an example , the paper single edge ( leading and trailing edges ) and the peak current of the double edge ( triangle leading edge and triangular trailing edge ) modulated digital control technology and digital the mean current control technology were studied in detail , and the different algorithms of the various modulation methods were compared. The results show that : the digital peak current control technology , leading edge modulation planted with excellent load transient characteristics ; for digital average current control technique , dual-edge modulation methods ( triangle edge modulation and triangular trailing edge modulation ) with excellent load transient characteristics. Papers based on different algorithms to establish small-signal model of the S domain ; latter rectangle method , bilinear transform zero-order hold control method and pole-zero matching method commonly used discrete small signal model of the Z domain ; various small signal analysis and frequency domain simulation model . The paper examines the stability of digital peak current control and digital control algorithm of the mean current in the four modulation mode , the results indicate that the sub-harmonic oscillation problems can be avoided by selecting an appropriate modulation method . Leading edge modulation and the triangular front modulated digital peak current control, average current control of the double edge modulation digital sub-harmonic oscillations will not appear in the entire duty cycle range . Paper using digital control algorithm flexibility , the introduction of digital slope compensation technology , eliminating the algorithm in the presence of sub-harmonic oscillations , improve the transient response of switching converter performance .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Power supply
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