Regulation method of wide input llc resonant converter based on adjustable transformer ratio

A resonant converter and transformer technology, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve the problems of reduced efficiency, filter inductance, system instability, and sensitive converter gain, etc., to achieve Improvement of efficiency and stability, effect of high converter efficiency

Active Publication Date: 2018-12-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, when the input voltage changes in a large range, it is necessary to adjust the switching frequency to deviate from the resonance point, which will lead to a decrease in the performance and efficiency of the LLC resonant converter, and will cause the gain sensitivity of the converter, resulting in system instability
However, the current hybrid control introduces symmetrical PWM modulation or asymmetrical PWM modulation that reduces the duty cycle, which will lead to a reduction in efficiency or require a filter inductor on the output side, which is not conducive to the improvement of the efficiency and stability of the LLC filter.

Method used

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  • Regulation method of wide input llc resonant converter based on adjustable transformer ratio
  • Regulation method of wide input llc resonant converter based on adjustable transformer ratio
  • Regulation method of wide input llc resonant converter based on adjustable transformer ratio

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0024] Such as figure 1 As shown, the topology of the wide-input LLC resonant converter based on the adjustable transformer ratio provided by the present invention consists of a full-bridge inverter link, a resonant cavity, a transformer with taps on the secondary side, and an uncontrolled full-bridge rectifier link. where: resonant inductance L r is 90μH, the magnetizing inductance L m is 270µH, the resonant capacitor C r is 30nF, the output capacitance is 1000μF, and the resonant frequency f r It ...

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Abstract

The invention provides an adjustable transformer ratio-based wide-input LLC resonant converter and a regulation and control method. The adjustable transformer ratio-based wide-input LLC resonant converter comprises an inversion module, a resonance module, a transformer and a rectification module, wherein after an input voltage passes through the inversion module and the resonance module in sequence, the input voltage is subjected to voltage reduction through the transformer; then a stable direct current voltage is output through the rectification module, and taps are arranged on the secondary side of the transformer and are used for adjusting the transformer ratio according to the magnitude of the input voltage. By adoption of the LLC resonant converter designed in the invention, a relatively small switching frequency variation range can be maintained, and can be basically stabilized between 0.8fr and fr (which is illustrated in the specification); and meanwhile, the stable output voltage can be guaranteed in a relatively wide input voltage range, so that the efficiency and the stability of the LLC resonant converter are improved.

Description

technical field [0001] The invention relates to the field of electrical engineering, in particular to a wide-input LLC resonant converter based on an adjustable transformer transformation ratio and a control method. Background technique [0002] The LLC resonant converter has the advantages of high efficiency and high power density, and is widely used in DC-DC converter applications. The LLC resonant converter can realize the zero-voltage turn-on (ZVS) of the primary switch tube and the zero-current turn-off (ZCS) of the secondary switch tube in the entire operating range. Its parasitic components include junction capacitance of semiconductor devices and magnetic flux leakage of transformers. Both inductance and magnetizing inductance can be used to realize ZVS, which makes the LLC resonant converter have high operating efficiency. The loss caused by the most important loss magnetic components of the LLC resonant converter, the LLC resonant converter usually adopts the vari...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/338
CPCH02M3/3381H02M3/3385Y02B70/10Y02P80/10
Inventor 李文宇王志新
Owner SHANGHAI JIAO TONG UNIV
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