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Passive control method based on fal function integral for buck converter with constant power load

A constant power load, passive control technology, applied in output power conversion devices, DC power input to DC power output, control/regulation systems, etc. deviation, improving anti-interference ability and dynamic performance, and the effect of simple and easy parameter setting

Active Publication Date: 2022-04-12
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Theoretically, the Buck converter can achieve gradual convergence to the ideal value under the action of the passive controller, but due to the fluctuation of the load, when the load changes suddenly, the output voltage of the converter will produce a voltage deviation

Method used

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  • Passive control method based on fal function integral for buck converter with constant power load
  • Passive control method based on fal function integral for buck converter with constant power load
  • Passive control method based on fal function integral for buck converter with constant power load

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Embodiment Construction

[0027] specific implementation

[0028] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0029] figure 1 The shown is the integral passive control structure diagram of the Buck converter with constant power load based on the fal function. The circuit includes a distributed power supply E, a controllable switch tube, a freewheeling diode, an inductor L and a capacitor C, and a resistive load R. Constant power load CPL, the designed integral passive control based on the fal function will collect the converter inductor current i L , capacitor voltage V o (that is, the output voltage) is input as a control parameter into the passive control and the integral control based on the fal function. Even in the case of load fluctuations, it can be processed by the controller and generated by PWM chopping to generate a PWM wave control with a specific duty ratio. Control the switch tube D to make the output voltage stable without de...

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Abstract

The present invention is an integral passive control method based on the fal function of a Buck converter with a constant power load. On the basis of passive control, the method considers the situation of a sudden change in load, and introduces the fal function into the integral link to obtain the Compensation control rate Δu; In the formula, the voltage tracking error of Buck converter is defined as e=V o * -V o , where V o * is the reference voltage, V o Respectively output voltage, k i is the integral gain, α is an adjustable parameter, δ is the interval length, and t is time; add the main control rate u of the passive control and the compensation control rate Δu when the load changes suddenly to obtain the integral passive controller based on the fal function The control rate u*, the obtained control rate u* is processed by PWM chopping to generate a PWM wave, which controls the output voltage of the DC-DC converter, and realizes passive control under the condition of constant power load and resistive load.

Description

technical field [0001] The invention belongs to the field of voltage converter control, and relates to a control method for a Buck converter with a constant power load, in particular to an integral passive control method based on a fal function for a Buck converter with a constant power load. Background technique [0002] In recent years, due to the development of power electronics technology, DC-DC converters are often used in power electronics convenient equipment, DC motor drives, and DC microgrids. There are extremely high requirements for stability and precision. The diversity and randomness of the load will seriously affect the closed-loop performance of the DC-DC converter. The negative impedance characteristic of the constant power load will cause the converter to oscillate cyclically. The traditional linear control cannot solve the constant power problem. Passive control ensures the energy dissipation in inductors and capacitors by injecting virtual damping, ensuri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 张泽华宋桂英杨博伟侯明宣刘畅
Owner HEBEI UNIV OF TECH
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