Fast transient response digital switch converter and control method of fast transient response digital switch converter

Abstract

The invention provides a digital switch converter with fast transient response capability. The digital switch converter comprises a Buck type switch converter power level main topology structure, an A / D (analog-to-digital) sampling conversion unit, a prediction control unit, a fuzzy PID (proportion integration differentiation) control unit, a DPWM (digital pulse width modulation) unit and a driving unit, wherein the A / D sampling conversion unit respectively samples the analog output voltage value and the analog inductor current value of the sampling switch converter and converts analog signals into digital signals, the prediction control unit predicts the next switch period output voltage value according to the A / D sampling digital signal value combined with the Buck type switch converter main topology structure, the fuzzy PID control unit determines the switch period duty ratio according to the output voltage error value and the output voltage error deviation value, and the DPWM unit and the driving unit output the corresponding on-off state of a power tube of the PWM driving switch converter according to the duty ratio for regulating the output voltage value.

Description

technical field [0001] The invention relates to a digital switching converter, especially a digital switching converter with fast transient response and a control method thereof, which can overcome the delay effect of the digital converter, dynamically adjust the control performance, and effectively improve the transient response performance of the converter . Background technique [0002] As the power supply system of electronic products, the performance of switching converters is related to the processing accuracy, reliability and stability of electronic products. Traditional analog converters have inherent shortcomings, such as process deviation, poor flexibility, non-linear compensation, inconvenient integration, etc., making it difficult to meet the growing requirements of portable electronic products. In recent years, the number of digital converters that have attracted much attention has decreased Common problems in analog converters, high integration, strong functio...

AI Technical Summary

Problems solved by technology

Traditional analog converters have inherent shortcomings, such as process deviation, poor flexibility, non-linear compensation, inconvenient integration, etc., making it difficult to meet the growing requirements of portable electronic products. In recent years, the number of digital converters that have attracted much attention has decreased Common problems in analog converters, high integration, strong function scalability, complete monitoring functions, easy to interface with digital systems, support more protocols, and easy to implement a variety of nonlinear control algorithms

Digital switching converters have steps such as data sampling, quantization, data processing, algorithm compensation, and DPWM generation. Loop delay is an inherent defect in digital control systems, which affects the transient response performance of digital switching converters.

[0003] The most commonly used control method for switching converters is PID control. The advantage is that the design is simple, but it is difficult to ensure the stability of the converter when the input and load vary in a large range. This is because the converter is a nonlinear system, and it is difficult to abstract the required The precise mathematical model of the controller, so the control effect and regulation quality of the controller are limited, and it is difficult to obtain fast transient response performance

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