High transient response digital control system and method of switch power supply

A technology of digital control system and switching power supply, applied in general control system, control/regulation system, adaptive control, etc., can solve the problems of start-reset logic, error, etc., achieve small physical space, improve transient response, and overall The effect of superior performance

Active Publication Date: 2010-12-15
SOUTHEAST UNIV
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Problems solved by technology

When using advanced ICs such as the latest gigahertz DSPs, FPGAs, ASICs and microprocessors, if the core

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  • High transient response digital control system and method of switch power supply
  • High transient response digital control system and method of switch power supply
  • High transient response digital control system and method of switch power supply

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Embodiment Construction

[0024] see figure 1 and Figure 4 , the control system includes: sampling module, AD conversion module, data processing module, fuzzy PID module, DPWM module and undervoltage protection module. The above control system is connected with the controlled switching power supply to form a closed-loop system. The output voltage of the main structure is sampled, and the sampling output is converted into an 8-bit digital signal by the A / D conversion module and then enters the data processing module. The device compares the sampled voltage signal with the given voltage signal to obtain the voltage deviation ε u And record it, and calculate the deviation change rate Δε from the current deviation record and the last deviation record u , will ε u and Δε u Input the fuzzy PID module (the fuzzy PID module uses the digital error signal to control the DPWM module, which outputs a switch control signal to the power supply with a duty cycle, so that the output value of the power supply foll...

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PUM

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Abstract

The invention discloses a high transient response digital control system and a method of a switch power supply, the control system comprises a sampling module, an AD conversion module, a data processing module, a fuzzy PID module and a DPWM module, the control system is connected with a controlled switch power supply to form a closed-loop system, the sampling module samples output of the switch power supply, sampling output is converted to digital signals through A/D conversion, continuous digital signals enter the data processing module to be digitally filtered and to be compared with a set voltage value, the generated deviation and deviation variance rate are supplied to the fuzzy PID module, a control algorithm is carried out in the fuzzy PID module, an appropriate duty ratio is submitted to the DPWM output module, and PWM signals of a switch control pipe are generated and output, therefore, the switch pipe of the digital power supply can be controlled better to be used for stabilizing the voltage. Simultaneously, under-voltage detection is carried out on digital signals of the output voltage, and if the voltage is abnormal, PWM turnoff signals are sent out immediately to stop the system.

Description

technical field [0001] The invention relates to a control system of a switching power supply, in particular to a high transient response digital control system and method of a switching power supply. Background technique [0002] In this field, because the switching power supply based on synchronous rectification is used to convert an available direct current (DC) level voltage into another DC level voltage. A buck converter is a specific type of switching power supply that selectively stores energy in an output inductor coupled to the load by switching the current flowing into the output inductor to provide a regulated DC output voltage to the load. [0003] A general DPWM control circuit is constructed with analog circuit components such as operational amplifiers, comparators and passive components such as resistors and capacitors for loop compensation, and some digital circuit components such as logic gates and flip-flops. But often in a harsh working environment, the pe...

Claims

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Application Information

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IPC IPC(8): H02M3/157G05B13/02G05B11/42
Inventor 徐申李青乘陈宁孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV
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