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Control method for improving dynamic response of switch power

專利號(hào)
US10097077B2
公開日期
2018-10-09
申請(qǐng)人
SOUTHEAST UNIVERSITY（CN Nanjing）
發(fā)明人
Shen Xu; Chong Wang; Xianjun Fan; Weifeng Sun; Shengli Lu; Longxing Shi
IPC分類
G05F1/70; G05F1/00; A61B17/32; B41J2/00; H02M3/158; H02M1/08; G05B19/042; H02M1/00
技術(shù)領(lǐng)域
mode,module,voltage,pid,load,lth,vo,dynamic,htl,output
地域： Nanjing

摘要

A control method for improving dynamic response of switch power is based on a closed-loop control system comprising a sampling module, a dynamic control module, an error calculation module, a PID module, a mode control module, and a PWM module. The sampling module samples an output voltage Vo, and the dynamic control module compares the output voltage Vo with a set maximum voltage Vomax, a set minimum voltage Vomin, and a reference voltage Vref, so as to determine whether to adopt a dynamic mode. In the dynamic mode, when the output voltage Vo changes greatly, the output voltage Vo is rapidly restored to a stable voltage by inputting large power or small power.

說明書

, ?
the primary inductance Lp=1.6 mH, the primary peak current of the LTH mode is Ip_LTH=0.4 A, the switch period is that TLTH=14.3 us, η is the system efficiency which is 0.8, and Io(n) is an output load current. In order to decrease the error of the rising slope, the value of subtracting the sampling result V(n?5) before five periods from the sampling result V(n) of the current period is taken as the size of the slope, and it can be obtained that when switching from light load to heavy load, the LTH is invoked, and the relationship between the output load and the corresponding working state thereof and the slope is table 1; therefore, for example, when switching from light load to heavy load (7Ω), the output jumps out of the LTH mode and enters the PFM mode when the output voltage reaches 5V, the initial working state is 350 Ts/clk (57 kHz), and the primary peak current is 0.286 A; in this way, large ripple waves will not be introduced by the output. The output voltage is sampled digitally. The digital quantity corresponding to 5V is 583, and Kup is calculated by the digital quantity.

TABLE 1

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1
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