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High anti-interference fast response control system and method for resonance type DC-DC converter

A DC-DC and control system technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as strong voltage gain nonlinearity, high mathematical model order, and high difficulty in precise control , to achieve the effect of improving speed and accuracy, good accuracy, and broad application prospects

Inactive Publication Date: 2020-07-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The inventors of the present disclosure found that although the LLC resonant converter has the above-mentioned advantages, due to the existence of multiple resonant elements, its operation process is complicated, the voltage gain is nonlinear, and the order of the mathematical model is high, which makes it difficult to establish an accurate model; at the same time, it is susceptible to Input voltage fluctuations, resonant component parameter drift, load changes and other disturbance effects, the model is time-varying, and precise control is difficult

Method used

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  • High anti-interference fast response control system and method for resonance type DC-DC converter
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  • High anti-interference fast response control system and method for resonance type DC-DC converter

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Embodiment 1

[0037] As mentioned in the background technology, because the existing LLC resonant converter is susceptible to disturbances such as input voltage fluctuations, resonant element parameter drift, and load changes, it is difficult to accurately control the existing control methods. Therefore, Embodiment 1 of the present disclosure A high anti-disturbance and fast response control system for a resonant DC-DC converter is provided.

[0038] First, a small-signal model of the LLC resonant converter is established to obtain its input-to-output transfer function.

[0039] Then, design the tracking-differentiator (TD), plan the transition process, solve the contradiction between rapidity and overshoot, and obtain the differential signal of the given signal.

[0040] Thirdly, according to the LLC resonant converter model, a linear state observer (LESO) is designed to observe the system state and disturbance, and a compensation function is designed to reduce the burden of LESO and impro...

Embodiment 2

[0099] Embodiment 2 of the present disclosure provides a high anti-disturbance and fast response control method for a resonant DC-DC converter. The control block diagram is as follows image 3 As shown, including tracking differentiator (TD), linear extensional state observer (LESO) and synovial membrane controller (SMC).

[0100] After the voltage reference signal v passes through TD, it outputs its tracking signal v 1 , the first and second order differential signal v 2 and v 3 . The control signal u output by the controller and the output voltage y of the converter (V o ) enters LESO, and outputs the estimated state z 1 ,z 2 and estimated disturbance z 3 .

[0101] Among them, f 0 (z 1 ,z 2 ) is a partial interference compensation designed according to the converter model to reduce the burden on LESO and improve accuracy.

[0102] v 1 , v 2 with z 1 ,z 2 form the error signal e 1 、e 2 , together with v 3 It is sent to the sliding mode controller together w...

Embodiment 3

[0154] Embodiment 3 of the present disclosure provides an electronic device, including the high-disturbance immunity and fast-response control system for a resonant DC-DC converter described in Embodiment 1 of the present disclosure.

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Abstract

The invention provides a high anti-interference fast response control system and method for a resonance type DC-DC converter and belongs to the technical field of advanced control of efficient power conversion systems. The system comprises a tracking differentiator, a linear expansion state observer and a sliding mode controller; the tracking differentiator outputs a tracking signal, a first-orderdifferential signal and a second-order differential signal according to a received voltage reference signal; the linear expansion state observer obtains a first estimation state, a second estimationstate and estimation disturbance according to a received signal, and then obtains a first error signal and a second error signal; the sliding mode controller outputs a control signal according to a preset sliding mode control law, the received first error signal, the received second error signal, the received second-order differential signal and the estimated total disturbance, and generates a PWMdriving signal through a driving generator to drive the switching tube of the converter to act. The method has the high anti-interference characteristic of active disturbance rejection control and the fast dynamic response characteristic of sliding mode control, and can effectively relieve a buffeting problem easily caused by traditional sliding mode control.

Description

technical field [0001] The present disclosure relates to the field of advanced control technologies for high-efficiency power conversion systems, and in particular to a high-disturbance and fast-response control system and method for a resonant DC-DC converter. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Resonant DC-DC converters have natural soft switching characteristics, high efficiency and power density, and are widely used in fields such as electric vehicle charging and discharging. Among them, the LLC resonant DC-DC converter has a wide range of soft switching, low switching loss, large output voltage range, and easy magnetic integration of resonant inductors and transformers, and has become a research and application hotspot. [0004] The electric vehicle charging system is generally composed of AC-DC and DC-DC. The DC-DC con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33569
Inventor 段彬白浩张承慧宋金秋杨东江苏祺钧
Owner SHANDONG UNIV
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