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Wide gain control method of variable topology LLC resonant converter.

A resonant converter, gain control technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problem of not meeting the requirements of wider input voltage, efficiency is greatly affected by switching frequency, Due to the complex design of magnetic components and other problems, the effect of small frequency conversion range, wide voltage gain range and low requirements is achieved.

Active Publication Date: 2020-02-07
MORNSUN GUANGZHOU SCI & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this circuit can only double the voltage gain and cannot meet the requirements of wider input voltage, and the full bridge / half bridge structure adopts frequency conversion control, the design of magnetic components is still relatively complicated, and the efficiency is more affected by the switching frequency. Big

Method used

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  • Wide gain control method of variable topology LLC resonant converter.
  • Wide gain control method of variable topology LLC resonant converter.
  • Wide gain control method of variable topology LLC resonant converter.

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Embodiment Construction

[0024] Such as image 3 As shown, the variable topology LLC resonant converter of this embodiment includes an inverter circuit 10 , an LLC resonant cavity 20 , a transformer T and a rectification network 30 sequentially connected from input to output. In the figure Vin is the input power of the converter, Ro is the output load R of the converter 0 .

[0025] The inverter circuit 10 is a variable topology circuit combining a full bridge / half bridge, and is composed of a switching tube S1, a switching tube S2, a switching tube S3, and a switching tube S4. The LLC resonant cavity 20 includes a resonant inductance Lr, an excitation inductance Lm and a resonant capacitor Cr, and a bidirectional switch composed of a switching tube S5 and a switching tube S6 is additionally provided. The rectification network 30 is a full bridge rectification circuit composed of 4 diodes D1-D4 connected in parallel to output filter capacitor C 0 constitute.

[0026] The drain of the switching tub...

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Abstract

The invention discloses a wide gain control method of a variable topology LLC resonant converter. The wide gain control method is applied to a variable topology LLC resonant converter composed of an inverter circuit, an LLC resonant cavity, a transformer and a secondary rectifier and filter output circuit. An input voltage range is divided into a low voltage section, a medium voltage section and ahigh voltage section which correspond to three different modes; the variable topology LLC resonant converter adopts variable-frequency PFM control of an FBLLC structure in the low-voltage section ofthe input voltage, and the output voltage gain is changed by changing the switching frequency; the variable topology LLC resonant converter adopts fixed-frequency PWM control of an FBLLC structure inthe medium voltage section of the input voltage, and the output voltage gain is changed by changing the duty ratio of an inverter circuit switching tube (S1); and the variable topology LLC resonant converter adopts fixed-frequency PWM control of an HBLLC structure in the high voltage section of the input voltage, and the output voltage gain is changed by changing the duty ratio of the inverter circuit switching tube (S1).

Description

technical field [0001] The invention relates to the technical field of switching converters, in particular to a wide gain control method of a variable topology LLC resonant converter. Background technique [0002] With the rapid development of power electronics technology, switching converters have been widely used. People place more demands on switching converters: high power density, high reliability and small size. As a kind of resonant converter, LLC resonant converter has many advantages such as low noise, low stress and low switching loss. LLC resonant converter generally adopts two methods of frequency conversion and fixed frequency control. However, when the input voltage and load vary widely, the operating frequency range of the LLC resonant converter using frequency conversion control alone is very wide, making the magnetic components in the circuit The design is difficult, and when the voltage gain is wide, the efficiency of the traditional variable frequency co...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33507H02M3/33569H02M1/0058Y02B70/10
Inventor 杜鹃李思远李永昌
Owner MORNSUN GUANGZHOU SCI & TECH
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