A sido Buck switching converter and digital control method

Abstract

The invention discloses a SIDO Buck switching converter and a digital control method. The converter includes a sampling module, an A / D conversion module, an error calculation module, a PID control module, a CCB sequence change control module, a PWM module and a gate-level drive logic circuit. The method is as follows: the sampling module converts the analog signal into a discrete signal, and then converts it into a digital signal by the A / D conversion module, and inputs it to the error calculation module; the PID module determines the duty ratio value of the new switching cycle according to the error value; The empty ratio value outputs the PWM signal, and the drive circuit determines the on-off of the switch tube to realize the adjustment of the output voltage value; the CCB sequence change control module judges whether to enter the sequence change control, and when the input voltage changes, the system returns to the state by adjusting the input power. steady state. The invention reduces the cross interference of two branches of the switch converter, improves the dynamic response of the switch converter and improves the steady-state performance of the system.

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, the requirements for integration of electronic devices are increasing day by day. In portable electronic devices such as smart phones and tablet computers, various processing units are packaged in each chip. This method is called on-chip. System (System on chip, SoC). SoC contains a variety of processing units, and the operating voltages required by different units are also different. 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. [0003] In order to save chip area, improve system integration, and reduce the number of ext...

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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.

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