Control loop system used for multi-mode digital switch power source

Abstract

The invention discloses a control loop system used for a multi-mode digital switch power source. The control loop system comprises a digital sampling module, an error generating module, a state registering module, a state judgment module, an error amplification module, a control voltage limiting module and a multi-mode switch signal generating module. The digital sampling module collects controlled signals and converts the controlled signals into digital signals Vod, the state judgment module judges the state for the control loop system to get into according to state switching triggering conditions, the error amplification module generates a control variable P(n) according to error signals e(n), the control variable P(n) enters the control voltage limiting module, the control voltage limiting module obtains the corresponding control voltage Vc1(n) and Vc2(n) according to the state of the control loop system at the moment and the P(n), and the multi-mode switch signal generating module obtains duty ratio signals according to the Vc2(n) and the state to control a controlled power converter switch pipe to be connected.

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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