A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range

Hui-pin LIN; Xiao-guang JIN; Liang XIE; Jin HU; Zheng-yu LU

doi:10.1631/FITEE.1600029

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A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range

Regular Papers | Updated：2022-05-19

- A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range
- 一种新颖的用于宽输入电压范围的LLC谐振变换器的变模态控制策略
- Frontiers of Information Technology & Electronic Engineering Vol. 18, Issue 3, Pages: 410-422(2017)
- Affiliations：
  
  College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
- Author bio：
- Funds：
- DOI：10.1631/FITEE.1600029
  CLC： TM923.61
- Received：20 January 2016，
  
  Accepted：10 November 2017，
  
  Published：2017-03
- Accepted：
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Hui-pin LIN, Xiao-guang JIN, Liang XIE, et al. A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range[J]. Frontiers of Information Technology & Electronic Engineering, 2017, 18(3): 410-422.
DOI：

Hui-pin LIN, Xiao-guang JIN, Liang XIE, et al. A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range[J]. Frontiers of Information Technology & Electronic Engineering, 2017, 18(3): 410-422. DOI： 10.1631/FITEE.1600029.

摘要

本文提出了一种新颖的适用于LLC谐振变换器的混合模态控制策略，可以使得LLC谐振变换器输入宽电压范围。这种控制策略结合了全桥LLC谐振变换器，半桥LLC谐振变换器，变频控制和变脉宽控制的优点。在这种控制策略下，不同的输入电压决定了不同的电路工作模态。当输入电压很低的时候，电路采用了全桥电路和变频控制（FB_VF模态）。当输入电压升高到一定值，电路切换到全桥电路和移相控制（FB_PS模态）。当输入电压进一步上升时，电路切换到半桥电路和变频控制（FB_VF模态）。这种电路模态的切换是由数字信号处理器（digital signal processor

DSP）来实现的，不需要外加辅助电路，只需要修改一下软件。从轻载到重载下，LLC谐振变换器的原边MOSFET可以实现零电压开通（zero-voltage switching

ZVS），副边二极管可以实现零电流关断（zero-current switching

ZCS）。本文用一个额定功率300 W，输出电压450 V的LLC，输入电压20 V到120 V的谐振变换器的样机验证了这个优化的控制策略。实验结果显示，在这种控制策略下，变换器的最大工作效率可以达到95.7%，并且输入电压范围扩大了3倍。

Abstract

This paper proposes a new variable-mode control strategy that is applicable for LLC resonant converters operating in a wide input voltage range. This control strategy incorporates advantages from full-bridge LLC resonant converters

half-bridge LLC resonant converters

variable-frequency control mode

and phase-shift control mode. Under this control strategy

different input voltages determine the different operating modes of the circuit. When the input voltage is very low

it works in a full-bridge circuit and variable frequency mode (FB_VF mode). When the input voltage rises to a certain level

it shifts to a full-bridge circuit and phase-shifting control mode (FB_PS mode). When the input voltage further increases

it shifts into a half-bridge circuit and variable frequency mode (HB_VF mode). Such shifts are enabled by the digital signal processor (DSP)

which means that no auxiliary circuit is needed

just a modification of the software. From light load to heavy load

the primary MOSFET for the LLC resonant converter can realize zero-voltage switching (ZVS)

and the secondary rectifier diode can realize zero-current switching (ZCS). With an LLC resonant converter prototype with a 300 W rated power and a 450 V output voltage

as well as a resonant converter with 20-120 V input voltage

the experiments verified the proposed control strategy. Experimental results showed that under this control strategy

the maximum converter efficiency reaches 95.7% and the range of the input voltage expands threefold.

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