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LLC resonant converter and control method

A technology of a resonant converter and a control method, which is applied in the control/regulation system, the conversion of AC power input to DC power output, and the conversion of DC power input to DC power output, etc., can solve the problems of large device stress and inconvenient converter design. , to achieve the effect of small frequency conversion range, excellent comprehensive performance, and reduced loss

Inactive Publication Date: 2020-01-17
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of a boost circuit, the device stress will be greater, which also brings some inconvenience to the design of the converter.

Method used

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  • LLC resonant converter and control method
  • LLC resonant converter and control method

Examples

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Embodiment Construction

[0028] Such as image 3 As shown, the 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 .

[0029] The inverter circuit 10 is a full-bridge inverter circuit composed of a switch tube S1, a switch tube S2, a switch tube S3, and a switch 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.

[0030] The drain of the switching tube S1 is connected to the drain of the switching tube S2 and the positiv...

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PUM

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Abstract

The invention discloses an LLC resonant converter and a control method, and the LLC resonant converter is lower in design difficulty, and comprises an inverter circuit, an LLC resonant cavity, a transformer and a rectification network which are sequentially connected from the input to the output. The LLC resonant cavity comprises a resonant inductor Lr, an excitation inductor Lm and a resonant capacitor Cr, and is additionally provided with a two-way switch; the resonant inductor Lr and the resonant capacitor Cr are connected in series between the first output end of the inverter circuit and the first end of the primary side coil of the transformer. The second output end of the inverter circuit is connected with the second end of the primary side coil of the transformer, the excitation inductor Lm is connected with the primary side coil of the transformer in parallel, the first end of the two-way switch is connected with the first end of the primary side coil of the transformer by being connected between the resonance inductor Lr and the resonance capacitor Cr, and the second end of the two-way switch is connected with the second end of the primary side coil of the transformer; theresonant inductor Lr is connected between the first end of the two-way switch and the first end of the primary side coil of the transformer, and the resonant capacitor Cr is connected between the first end of the two-way switch and the first output end of the inverter circuit.

Description

technical field [0001] The invention relates to the technical field of switching converters, in particular to an LLC resonant converter and a control method thereof. Background technique [0002] With the rapid development of the field of power electronics, switching converters are used more and more widely. 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. However, the traditional LLC resonant converter generally needs to adjust the output voltage by changing the switching frequency. When the load or input voltage fluctuates, the switching frequency needs to be changed in a wide range, which brings great difficulties to the design, analysis and control of the converter. great difficulty. When the voltage gain is wide, the efficiency of the traditional variable frequency control LLC resona...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/5387H02M7/5395
CPCH02M3/3353H02M7/53871H02M7/5395H02M1/0048H02M7/4815Y02B70/10
Inventor 余逸群李思远王志燊
Owner MORNSUN GUANGZHOU SCI & TECH
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