Power converter capable of optimizing transient response characteristics

Abstract

The invention relates to the technical field of electronics, and particularly relates to a power converter capable of optimizing transient response characteristics, which comprises a working circuit provided with an energy storage element and a control circuit, wherein the working circuit is switched between a charging mode and a discharging mode alternatively under effects of modulation signals and is used for converting input voltage to output voltage; the control circuit comprises a comparator and a modulator; the comparator is used for comparing a signal at the output end of an error amplifier and a current detection signal to generate a comparison signal; the modulator is used for generating a modulation signal according to the comparison signal and a clock signal; a compensating branch is controllably connected between the output end of the error amplifier and the grounding end; and the compensating branch is used for conducting or breaking connection with the output end of the error amplifier under effects of a second control signal. The power converter cuts off the compensating branch in the case of no requirements of the system, charges on the compensating branch are saved, the output end signal of the error amplifier can be recovered quickly in the case of requirements of the system, output voltage has little fluctuation, and stability of the system is facilitated.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a power converter. Background technique [0002] In recent years, as battery-powered portable devices have improved in performance and become richer in features, the demands placed on power converters have become higher and higher. in such as figure 1 In the current mode step-down converter shown, in order to achieve high conversion efficiency in a wide load range, the prior art uses different control strategies to stabilize the output voltage according to light load or heavy load, such as using a hybrid control method to stabilize the output voltage at light load Mode adopts the pulse frequency modulation method, and the heavy load mode adopts the pulse width modulation method. However, during the use of the power converter, there is often a situation of switching between light and heavy loads and no loads, and the output voltage Vout during the switching process often fluc...

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Problems solved by technology

in such as figure 1 In the current mode step-down converter shown, in order to achieve high conversion efficiency in a wide load range, the existing technology adopts different control strategies to stabilize the output voltage according to light load or heavy load, such as using a hybrid control method to stabilize the output voltage at light load Mode adopts the pulse frequency modulation method, and the heavy load mode adopts the pulse width modulation method. However, during the use of the power converter, there is often a situation of switching between light and heavy loads and no loads, and the output voltage Vout during the switching process often fluctuates. If it is too large, it will affect the stable operation of the system

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