A Control Loop System for Multi-mode Digital Switching Power Supply

Abstract

A control loop system for a multi-mode digital switching power supply, including a digital sampling module, an error generation module, a state register module, a state judgment module, an error amplification module, a control voltage limiting module and a multi-mode switch signal generation module, the digital sampling The module collects the controlled signal and converts it into a digital signal Vod. The state judgment module judges the state value state that the control loop system needs to enter according to the trigger condition of the state transition. The error amplifier generates the control value P(n) according to the error signal e(n). The control quantity P(n) enters the control voltage limiting module, and the control voltage limiting module obtains the corresponding control voltages Vc1(n) and Vc2(n) according to the state value state and P(n) of the control loop system at this time, multi-mode The switching signal generating module obtains a duty ratio signal according to Vc2(n) and the state value state, and controls the conduction of the switching tube of the controlled power converter.

Description

technical field [0001] The invention relates to a digital switching power supply, in particular to a control loop system for a multi-mode digital switching power supply. Background technique [0002] With the development of digital technology, digital power supply has been paid more and more attention due to its own advantages. In AC-DC and DC-DC switching power supply, more and more control systems are realized in digital way, but with the global energy In short supply, the United States VI energy efficiency standard has higher and higher requirements for power conversion efficiency. Now it is imminent to realize a switching power supply with high efficiency in the whole load range. At light load, switching loss accounts for most of the energy loss of the entire system. The direct way to reduce switching loss at this time is to reduce the switching frequency. Based on this consideration, many digital power supplies now adopt multi-mode control schemes. At heavy load, the s...

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Problems solved by technology

When the load is between M and N, the system will switch back and forth between the two modes. The switching condition is that the output voltage is greater than or less than the set limit, but this scheme does not eliminate the back and forth between the two modes. jump, the output voltage still has a certain fluctuation

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