Four-tube synchronous control buck-boost conversion circuit with multi-mode switching and low dynamic interference

Abstract

The invention discloses a four-tube synchronous control buck-boost conversion circuit with multi-mode switching and low dynamic interference, which comprises a power level transmission circuit, a current sampling circuit, an oscillator, a ramp generator, a pulse modulation circuit, an error amplifier, a sequential control logic circuit, a hysteresis mode selection circuit and a direct-current offset voltage circuit. The sequential control logic circuit controls on-off of four tubes by designing a time sequence in different modes. The hysteresis mode selection circuit reduces output voltage ripple deterioration through a hysteresis comparator. The direct-current offset voltage circuit is used for reducing dynamic interference generated during mode switching. According to the four-tube synchronous control buck-boost conversion circuit provided by the invention, the problems of output voltage ripple deterioration and large dynamic interference caused by frequent switching of working modes of the existing buck-boost conversion circuit can be solved on the premise of providing reliable output voltage.

Description

technical field [0001] The invention belongs to the technical field of microelectronics, and further relates to a four-tube synchronous control buck-boost conversion circuit with multi-mode switching and low dynamic interference in the technical field of integrated circuits. The invention can be used in the integrated circuit to control the power supply module of the electronic equipment to switch between multiple working modes. Background technique [0002] In recent years, buck-boost converters have been widely used in battery-powered electronic devices. How to prolong the working time of battery power under the same battery capacity has become the primary issue in the field of power management. By increasing the input voltage range, the buck-boost converter can continue to work under lower input voltage conditions when powering electronic equipment, thus extending the use time of battery power. However, due to the inverting characteristics of the input voltage and the ou...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, and propose a multi-mode switching low dynamic interference 4-tube synchronous control buck-boost conversion circuit, aiming at providing electronic equipment with a stable power supply voltage to solve the problem of lifting The problems of output voltage ripple deterioration and large dynamic interference caused by frequent switching of the working mode of the voltage converter

Images