Adaptive hysteresis control converter for enhancing transient characteristics, control method and equipment

Abstract

The invention provides an adaptive hysteresis control converter for enhancing transient characteristics, a control method and equipment. The converter is used for converting input electric energy intoelectric energy with controllable voltage or current required by a load, comprises a compensation unit, an input unit, a processing unit and a comparison unit, and is characterized in that the compensation unit and the processing unit are respectively connected with the input unit and the comparison unit. Compared with the existing slope compensation technical scheme of inductive current sampling, the characteristic that the MOS tube works in a linear resistance region is utilized to substitute traditional RC resistors, different slope compensation characteristics are generated under steady-state and transient-state conditions, the stability of the converter in a steady state is realized, the linear resistance value of the MOS is changed by utilizing feedback control in a transient state,the slope compensation capability is improved, the transient characteristic of the hysteresis control converter is improved, and the hysteresis control converter is simple in circuit structure, easyin technical operation and lower in cost.

Description

technical field [0001] The application relates to the field of integrated circuits, in particular to an adaptive hysteresis control converter, a control method and a device for enhancing transient characteristics. Background technique [0002] Buck converters (step-down switching converters) are widely used in voltage control mode, peak current control mode and hysteresis control mode. Compared with the voltage control mode and peak current control mode, the hysteresis control mode does not require a compensation network and an error amplifier, the loop structure is simple and self-oscillated, and the transient response speed is fast and the power consumption is low, so it is widely used. . [0003] The converter in the hysteretic control mode needs to sample the output ripple for feedback control. Under the development trend of ultra-low feedback reference voltage, it is more and more difficult for the hysteretic control mode to achieve better transient characteristics. Th...

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Problems solved by technology

[0006] The other mainly uses an adaptive ramp generating circuit to generate a ramp signal representing the inductor current, and adopts a hysteresis mode of the upper and lower threshold voltages in a dynamic adjustment method, so that the converter can obtain good transient response characteristics, but the circuit implementation is relatively complicated. higher cost

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