SIDO Buck switching converter and digital control method

Abstract

The invention discloses an SIDO Buck switching converter and a digital control method. The converter comprises a sampling module, an A / D conversion module, an error calculation module, a PID control module, a CCB order changing control module, a PWM module and a gate-level driving logic circuit. The method comprises the steps that: the sampling module converts an analog signal into a discrete signal, which is then converted into a digital signal through the A / D conversion module, and the digital signal is input into the error calculation module; the PID module determines a duty ratio of a newswitching period according to an error value; the PWM module outputs a PWM signal according to the duty ratio, and the driving circuit determines the on-off of a switching tube to realize the adjustment of an output voltage value; and the CCB order changing control module judges whether to enter order changing control or not, and enables the system to return to a steady state by adjusting the input power when the input voltage changes. According to the invention, the cross interference of two branches of the switching converter is reduced, dynamic response of the switching converter is improved, and the steady-state performance of the system is improved.

Description

Technical field [0001] The invention relates to the technical field of isolated DC-DC converters, in particular to a SIDO Buck switching converter and a digital control method. Background technique [0002] With the rapid development of science and technology, electronic devices have increasingly higher requirements for integration. In portable electronic devices such as smartphones and tablet computers, multiple processing units are packaged in one chip. This method is called on-chip. System (System on chip, SoC). SoC contains a variety of processing units, and different units require different operating voltages. Therefore, a power management module is required to supply power to each unit. The traditional solution is to use multiple independent power supplies to supply power separately, so there are multiple external inductors and multiple power tubes are required. [0003] In order to save chip area, improve system integration, and reduce the number of external filter inducto...

AI Technical Summary

Problems solved by technology

[0004] In the current power management, in order to obtain relatively high efficiency, a multi-mode control method is generally selected, which will lead to a decline in the dynamic performance of the power supply and cannot meet the increasingly high dynamic performance requirements.

Images