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Sliding-mode controller of LLC (logic link control) series resonance DC-DC converter and control method thereof

A technology of series resonance and converter, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve problems such as difficult to meet requirements, output waveform distortion, slow dynamic response speed, etc., and achieve good adaptability performance, improve dynamic characteristics, and improve the effect of dynamic response speed

Active Publication Date: 2011-10-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional PID control has the advantages of simple control, good stability, and strong applicability, but it is sensitive to changes in system parameters. When the load changes in a large range, especially with nonlinear loads, it has slow dynamic response and poor output waveform. Defects such as distortion
Nowadays, the application range of LLC series resonant DC-DC converters is becoming wider and wider, and its performance requirements are constantly improving. In particular, it is required that the converter has high steady-state accuracy and fast dynamic response speed. Traditional PID control Policies Difficult to Meet

Method used

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  • Sliding-mode controller of LLC (logic link control) series resonance DC-DC converter and control method thereof
  • Sliding-mode controller of LLC (logic link control) series resonance DC-DC converter and control method thereof
  • Sliding-mode controller of LLC (logic link control) series resonance DC-DC converter and control method thereof

Examples

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Embodiment 1

[0030] Such as figure 2 and 3 As shown, a sliding mode controller of an LLC series resonant direct-to-direct converter includes: a second-order sliding mode control loop, a hysteresis comparator, an isolation circuit and a dual-frequency switching controller.

[0031] The input terminal of the second-order sliding mode control loop is connected to the output terminal of the LLC series resonant DC-DC converter to sample the output voltage signal v of the converter o , and generate a sliding mode output signal;

[0032] The second-order sliding mode control loop is composed of subtractor A1, adder A4, proportional regulator A2 and differential regulator A3; wherein, the first input terminal of the subtractor A1 is the input terminal of the second-order sliding mode control loop and receives the LLC The output voltage signal v of the series resonant DC-DC converter o , the second input terminal of the subtractor A1 receives the reference voltage signal V provided by the exter...

Embodiment 2

[0038] Such as figure 2 and 4As shown, a sliding mode controller of an LLC series resonant direct-to-direct converter, including: a third-order sliding mode control loop, a hysteresis comparator, an isolation circuit and a dual-frequency switching controller.

[0039] The input terminal of the third-order sliding mode control loop is connected to the output terminal of the LLC series resonant DC-DC converter to sample the output voltage signal v of the converter o , and generate a sliding mode output signal;

[0040] The third-order sliding mode control loop is composed of a subtractor B1, an adder B5, a proportional regulator B2, a differential regulator B3 and an integral regulator B4; wherein, the first input terminal of the subtractor B1 is the third-order sliding mode control loop. The input terminal receives the output voltage signal v of the LLC series resonant DC-DC converter o , the second input terminal of the subtractor B1 receives the reference voltage signal V...

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PUM

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Abstract

The invention discloses a sliding-mode controller and control method of an LLC series resonance DC-DC converter, comprising a sliding-mode control ring circuit, a hysteresis comparator connected with the sliding-mode control ring circuit, an isolation circuit connected with the hysteresis comparator, and a dual-frequency shifting controller connected with the isolation circuit. Simultaneously theinvention also discloses a control method of the sliding-mode controller. In the invention, the sliding-mode control is applied to the LLC series resonance DC-DC converter so that the LLC series resonance DC-DC converter improves the dynamic response speed of the converter on the basis of having excellent steady-state characteristics and has excellent adaptability to the nonlinear load; simultaneously the dual-frequency shifting mode is adopted to control the output of the LLC series resonance DC-DC converter; the converter can adjust the converter to a new working state by frequency shiftinginstantaneously when the input voltage jumps or the load changes; therefore, the dynamic response time is shortened, the dynamic characteristic of the converter is improved, and the application situation with high-performance requirement can be met.

Description

technical field [0001] The invention belongs to the technical field of resonant converter control, and in particular relates to a sliding mode controller of an LLC series resonant direct-to-direct converter and a control method thereof. Background technique [0002] Such as figure 1 As shown, the existing LLC series resonant DC-DC converter usually adopts the traditional PID control feedback loop, and the subtractor compares the sampling output with the reference value, and the comparison result is connected to the voltage after the PID control adjustment and signal isolation. Controlled frequency conversion circuit, the voltage controlled frequency conversion circuit converts the input voltage signal into a square wave output with a duty cycle of 50% corresponding to the frequency, and the square wave output signal drives the power switch tube after the drive circuit to realize the adjustment of the output. In order to avoid the power switch tube of the same bridge arm fro...

Claims

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Application Information

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IPC IPC(8): H02M3/338
CPCY02B70/10
Inventor 马皓郭津
Owner ZHEJIANG UNIV