Straight-through prevention half-bridge LLC resonance converter
A resonant converter and anti-shoot-through technology, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, can solve the problems of high voltage stress of switching tubes and low efficiency of converters, and achieve improved power density. Effect of low voltage stress and improved efficiency
Inactive Publication Date: 2016-05-04
YANSHAN UNIV
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Problems solved by technology
[0003] In recent years, due to the continuous development of the aerospace industry, higher requirements have been put forward for the research and development of aerospace secondary power supplies. The traditional push-pull converter has high voltage stress on the switching tube and is hard switching, and the efficiency of the converter is low. It can be applied to occasions with low input voltage, but the bridge converter has the hidden danger of bridge arm shoot-through, so it is forbidden to apply
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[0024] specific implementation plan
[0025] The present invention will be further described below in conjunction with accompanying drawing.
[0026] A kind of anti-straight-through half-bridge LLC resonant converter of the present invention, such as figure 1 As shown, the converter is driven by the input source V in , a primary circuit, an LLC resonant network, a transformer, and a secondary circuit. The primary circuit is composed of an anti-straight-through half-bridge structure circuit composed of two power switch tubes and diodes connected in series. The secondary circuit is composed of Composed of rectifier circuit; LLC resonant network and transformer are composed of high-frequency transformer, resonant inductor L r , Exciting inductance L m and resonant capacitor C r constitute;
[0027] The primary side circuit includes a first power switch tube S 1 , the second power switch tube S 2 , Anti-shoot-through diode D 1 ; The first power switch tube S 1 , Anti-shoo...
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The invention discloses a straight-through prevention half-bridge LLC resonance converter. The converter is composed of an input source Vin, a primary circuit, an LLC resonance network, a transformer and a secondary circuit. The primary circuit is formed by a straight-through prevention half-bridge circuit formed in such a manner that two power switch tubes are serially connected with a diode. The secondary circuit is formed by a rectification circuit. The LLC resonance network and the transformer are formed by a high-frequency transformer, a resonance inductor Lr, an excitation inductor Lm and a resonance capacitor Cr. According to the invention, the LLC resonance structure and the straight-through prevention half-bridge structure are combined, the LLC resonance structure and a straight-through prevention half-bridge arm are integrated, so that the primary side straight-through prevention structure and soft switching of the primary power switch tubes are realized, and the reliability, the power density and the efficiency of the power converter are improved. The straight-through prevention half-bridge LLC resonance converter is applicable to the aerospace and military fields high in reliability, can be applied to the occasions of high input voltages and is simultaneously capable of realizing straight-through prevention, high reliability, high efficiency and high power density.
Description
technical field [0001] The invention relates to the field of power electronic converters for systems such as communication power supplies, aerospace high-reliability power supplies, and hybrid electric vehicles, and in particular relates to an anti-straight-through half-bridge LLC resonant converter. Background technique [0002] Switching power supplies are widely used in various fields of national production. The continuous development of aerospace and military fields has put forward higher requirements for the development of power converters with high reliability, high power density, high efficiency, and high power. The LLC resonant converter is widely used because it can realize soft switching in the whole load range and has high efficiency. The invention adopts the combination of LLC resonance and anti-through half-bridge structure to construct a highly reliable and high-efficiency converter. [0003] In recent years, due to the continuous development of the aerospace ...
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IPC IPC(8): H02M3/335H02M1/38
CPCH02M1/38H02M3/33569Y02P80/10
Inventor 赵清林范满义杨秋霞李晓菊
Owner YANSHAN UNIV