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Novel PSPWM control method and system for LLC resonant converter with fixed-frequency variable structure

A resonant converter and control method technology, applied in the control/regulation system, DC power input conversion to DC power output, AC power input conversion to DC power output and other directions, can solve problems such as output voltage limitation and reduce cycle The effect of current, improving transmission efficiency, and simple control method

Inactive Publication Date: 2021-03-02
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional frequency control mode, the output voltage of the LLC converter will be limited by the operating frequency and can only be adjusted within a limited range.

Method used

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  • Novel PSPWM control method and system for LLC resonant converter with fixed-frequency variable structure
  • Novel PSPWM control method and system for LLC resonant converter with fixed-frequency variable structure
  • Novel PSPWM control method and system for LLC resonant converter with fixed-frequency variable structure

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Experimental program
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Embodiment

[0056] Three ways of embodiment are realized as follows:

[0057] When the inverter circuit works in the fixed-frequency PWM control mode (FBLLC mode) of the half-bridge LLC structure. The switch tubes Q3 and Q4 are continuously turned off, the auxiliary switch tubes Q5 and Q6 are continuously turned on, and the input split capacitor C in1 、C in2 And switch tubes Q1, Q2, Q5, Q6 form a half-bridge LLC resonant converter. At this time, the switching frequency of the switching tube Q1 and the switching tube Q2 is always equal to the series resonance frequency, and the duty cycle of the switching tubes Q1 and Q2 can be set when working in the half-bridge mode (the set value is between 0 and 0.5), However, in order to ensure the continuity between the output voltage level and the multi-working mode switching, the embodiment of the present invention further selects reasonable parameter design to ensure the optimal effect, including setting the duty cycle of the switching tube Q1 a...

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Abstract

The invention provides a novel PSPWM control method and system for an LLC resonant converter with a fixed-frequency variable structure. The LLC resonant converter adopting a full-bridge and half-bridge variable structure mixed working mode is arranged; the LLC resonant converter comprises a direct-current input source Vin, a primary side full-bridge / half-bridge hybrid inverter, an LLC resonant tank, an isolation transformer, a secondary side full-bridge rectifying circuit, an output filter capacitor Co and an output resistance load R which are connected in sequence; a first switching tube Q1,a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4 in the primary side full-bridge / half-bridge hybrid inverter form a full-bridge inverter, and auxiliary switching tubes Q5 and Q6 are reversely connected in series between the midpoint between input split capacitors Cin1 and Cin2 and the midpoint of a full-bridge leading arm; and based on the switching-on and switching-off process of a primary side switching tube, three modes of conversion of a primary side working mode are completed, and the three modes correspond to a low voltage section, a medium voltage section and a high voltage section of an output voltage range respectively.

Description

technical field [0001] The implementation of the present invention relates to a novel primary-side switching tube pulse width modulation control scheme (PSPWM control) of a fixed-frequency variable structure LLC resonant converter, which realizes wide gain and wide output voltage range, and belongs to the isolated DC-DC power in the power electronics industry. field of converter technology. Background technique [0002] With the rapid development of power electronics technology and the substantial increase in the demand for new energy, new energy power generation technology has attracted widespread attention due to its advantages of high efficiency and low pollution. Among them, DC-DC converters (DC-DC converters) are widely used in high-power DC fields, such as communication power supplies, server power supplies, electric vehicle charging and lighting power supplies, making the requirements for converter efficiency and power density change. Therefore, the relevant DC conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088H02M7/483H02M7/5387H02M3/335
CPCH02M1/088H02M7/483H02M7/53871H02M3/33523Y02B70/10
Inventor 潘健石迪宋豪杰陈光义熊嘉鑫刘松林陈庆东刘孙德刘雨晴张琦
Owner HUBEI UNIV OF TECH
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