An Adaptive Slope Compensation Method for Digitally Controlled Power Converters

Abstract

The present invention provides an adaptive slope compensation method for a digitally controlled power converter, which is used to process the final compensation slope of the voltage ripple and feed it back to the power circuit, including the following steps: Step 1, inputting the voltage ripple to drive the control circuit Control signal; step 2, detecting the control signal to obtain the N-period off time, and thus constructing the N time queue; step 3, selecting the maximum and minimum values ​​in the off time of the N time queue to calculate the frequency jitter amplitude; step 4, According to frequency jitter amplitude T Jitter and the preset reference frequency jitter amplitude value T set Perform slope closed-loop adjustment to obtain the final compensation slope S c , and this final compensation slope S c Slope compensation for power circuits. Therefore, the self-adaptive compensation method of the digital control power converter provided by the present invention can automatically adjust the optimal compensation slope when the system is running, and always maintain an appropriate compensation value and dynamic response speed to improve the transient performance of the control system.

Description

technical field [0001] The invention relates to an adaptive slope compensation method for a digitally controlled power converter, which is used to solve the problem of frequency jitter of a control system caused by the small output ripple required by the power converter in a steady state. Background technique [0002] With the continuous development of high-performance microprocessors, especially DSP digital controllers, the application of digitally controlled power converters is becoming more and more extensive. Aiming at the limitations of traditional analog controllers, the digital controllers adopted have simple system configuration and high reliability. , strong flexibility, good compatibility and easy real-time monitoring. [0003] With the development of electronic information technology and the Internet, microprocessors of electronic equipment such as computers have put forward new requirements for the power supply system of microprocessors and other loads: lower out...

AI Technical Summary

Problems solved by technology

However, frequency jitter interferes with the power converter and aggravates the electromagnetic compatibility of the system. The method of increasing the compensation slope in the traditional voltage control mode and current mode has the disadvantages of reducing sensitivity and slowing down the dynamic response speed. In the working state, the control system of the traditional power converter still cannot solve the balance problem of low output voltage ripple and fast dynamic response capability, and the control system of the power converter is very sensitive to noise, etc.

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