Low voltage stress single-stage AC-DC converter based on LLC series resonance

A series resonance, AC-DC technology, applied in high-efficiency power electronic conversion, irreversible AC power input into DC power output, irreversible DC power input into AC power output and other directions, can solve the problem of inappropriate LCD power supply, Switch tube high voltage stress and other problems, to achieve the effect of input power factor correction, step-up and step-down, and wide output voltage adjustment range

Inactive Publication Date: 2009-08-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A general single-stage AC-DC converter can realize power factor correction and output voltage regulation at the same time by adjusting a switch variable, but the switch tube has to bear relatively high voltage stress, so it is not suitable for LCD power supplies with a wide input AC voltage range

Method used

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  • Low voltage stress single-stage AC-DC converter based on LLC series resonance
  • Low voltage stress single-stage AC-DC converter based on LLC series resonance
  • Low voltage stress single-stage AC-DC converter based on LLC series resonance

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Embodiment Construction

[0017] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0018] Low voltage stress single-stage AC-DC converter based on LLC series resonance, including:

[0019] Input filter circuit E, rectifier bridge Q, inductor L, capacitors C and CO, two switch tubes S 1 and S 2 , Diode D, D O1 and D O2 ,D 1 and C 1 are the switching tube S 1 integrated body diode and bulk capacitance, D 2 and C 2 are the switching tube S 2 integrated body diode and bulk capacitance, L r and L m are the leakage inductance and excitation inductance integrated in the transformer T;

[0020] The input filter circuit E and the rectifier bridge Q form an input rectification filter circuit;

[0021] Inductor L, switch tube S 1 , Diode D and capacitor C form a buck-boost circuit;

[0022] Switch tube S 1 and S 2 , capacitance C and C r , transformer T, and T integrated leakage inductance L r and magnetizing inductance L m Con...

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Abstract

The invention provides an LLC series resonance-based low-voltage stress single stage AC-DC convertor, which comprises an input rectification filter circuit consisting of an input rectification circuit (E) and a rectifier bridge (Q), a buck-boost circuit consisting of an inductor (L), a first switching tube (S1), a third diode (D) and a first capacitor (C), an output rectification filter circuit consisting a first diode (DO1), a second diode (DO2) and a third capacitor (CO), and an LLC series resonant inverter circuit consisting of a first switching tube (S1), a second switching tube (S2), a first capacitor (C), a second capacitor (Cr), a transformer (T), a leakage inductor (Lr) and a magnetic inductor (Lm). The convertor realizes input power factor correction and the functions of voltage boost and voltage buck, has wide output voltage regulation range, uses less switching tubes, is high in efficiency and low in cost, and can be used as an LCD power supply.

Description

technical field [0001] The invention relates to the technical field of single-stage AC-DC converters, in particular to low voltage stress single-stage AC-DC converters based on LLC series resonance. Background technique [0002] At present, LCD power supplies widely use two-stage AC-DC converters based on LLC series resonance, such as figure 1 shown. In this scheme, the converter is divided into two independent power transfer stages. The first stage is the power factor correction stage. Through a specific control strategy, the input current follows the input voltage waveform, making the input current sinusoidal, improving the power factor, and reducing harmonic content. At the same time, the control circuit also feeds back the output voltage to initially adjust the output voltage. The second stage is a DC-DC conversion stage based on LLC series resonance. The second stage fine-tunes the output voltage of the first stage, and all switching tubes realize soft switching. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/21H02M7/44H02M1/42
CPCY02B70/126Y02B70/10
Inventor 张波肖文勋张桂东
Owner SOUTH CHINA UNIV OF TECH
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