Control method for improving dynamic response of switch power
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
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the primary inductance of the HTL mode is that Ip_HTL=0.141 A, the switch period is that THTL=500 us, η is the system efficiency which is 0.6, and Io(n) is an output load current. In order to decrease the error of the descending slope, the value of subtracting the sampling result V(n) from the sampling result V(n?5) before five periods is taken as the size of the slope, and it can be obtained that when switching from heavy load to light load, the HTL is invoked, and the relationship between the output load and the corresponding working state thereof and the slope is table 2; therefore, for example, when switching from heavy load to small load (500Ω), the output jumps out of the HTL mode and enters the DPFM mode when the output voltage reaches 5V, the initial working state is 4330 Ts/clk (4.62 kHz), and the primary peak current is 0.151 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 Kdown is calculated by the digital quantity.
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