Method for controlling fuzzy PID digital control DC-DC converter

A DC-DC and fuzzy control technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve problems such as inability to guarantee system stability, improve system performance, and limit the scope of application, and achieve small overshoot , high control precision, optimized transient performance effect

Inactive Publication Date: 2015-07-15
SOUTHEAST UNIV
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Problems solved by technology

However, due to the nonlinear nature of the DC-DC converter system, the controller designed based on the small-signal model cannot guarantee the stability of the system under large-sca

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  • Method for controlling fuzzy PID digital control DC-DC converter
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  • Method for controlling fuzzy PID digital control DC-DC converter

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Embodiment Construction

[0020] Such as figure 1, the control method of fuzzy PID digital control DC-DC converter of the present invention, based on the fuzzy PID compensator that comprises ADC unit, comparator (Comparator), is provided with fuzzy control unit and PID control unit, digital pulse width modulator (DPWM) And the control system of the drive unit (Driver), the control system is connected in series with the main topology of the Buck DC / DC converter to form a closed loop. The main topology of the converter power stage includes NMOS transistor Q1, PMOS transistor Q2, inductor L, capacitor C and output load resistance Ro, the drain of NMOS transistor Q1 is connected to the positive terminal of input voltage Vin, the source of NMOS transistor Q1 and The substrate is connected to the source of the PMOS transistor Q2 and one end of the inductor L, the other end of the inductor L is connected to one end of the capacitor C, the input end of the ADC, and one end of the output load resistor Ro, and t...

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Abstract

The invention discloses a method for controlling a fuzzy PID digital control DC-DC converter. Based on a control system which comprises an ADC unit, a comparator, a fuzzy PID compensator with a fuzzy control unit and a PID control unit, a digital pulse width modulator and a driver unit, the control system and the main topology of a Buck type DC-DC converter are connected in series to form a closed loop, the analog output voltage of the converter is subjected to A/D conversion and then is input to the comparator to be compared with a digital reference voltage signal, the output voltage error value and the error deviation value are calculated, the fuzzy control unit determines the duty ratio value of the switching period according to the output voltage error value and the error deviation value, and the digital pulse width modulator and the driver unit output corresponding PWM according to the duty ratio value to control a power tube to be connected or disconnected so that the output voltage value can be regulated. The defect of the nonlinear effect of the converter is overcome, the system response is accelerated, overshooting is reduced, and good input disturbance resistance and load disturbance resistance are achieved.

Description

technical field [0001] The invention relates to a digital switching converter, in particular to a fuzzy PID digital control DC-DC converter control method applied to a digital control switching converter, which can dynamically adjust conventional PID control parameters according to the output voltage error and error deviation, effectively Improve the transient response performance of the converter. Background technique [0002] DC-DC converters are widely used in various portable electronic products as DC voltage supply equipment. Early DC-DC converters usually use analog control because it has the advantages of simple control, high precision, and mature technology. The improvement of function and other requirements has promoted the generation and development of digital control power supply. Compared with analog control, digital control has many advantages, such as digital devices are not easily affected by aging and environmental variables, are not sensitive to noise, hav...

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Application Information

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IPC IPC(8): H02M3/157G05B13/02
CPCH02M3/157
Inventor 常昌远周志琪赵欣朱文文黄晓敏吴承恩
Owner SOUTHEAST UNIV
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