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Three-phase three-level LLC resonance direct current converter and control method of three-phase three-level LLC resonance direct current converter

A resonant DC/converter technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and controlling/regulating systems, etc., can solve problems such as large switching losses, improve power density, reduce filter capacitance, The effect of reducing switching losses

Inactive Publication Date: 2014-02-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a three-phase three-level LLC resonant DC converter, which effectively solves the problem of large switching loss caused by the hard switching of the converter switch tube in the prior art

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  • Three-phase three-level LLC resonance direct current converter and control method of three-phase three-level LLC resonance direct current converter

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Embodiment Construction

[0025] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0026] Such as figure 1 As shown, a three-phase three-level LLC resonant DC converter includes an input voltage dividing capacitor unit 1, a half-bridge three-level unit 2, a full-bridge unit 3, a resonant network 4, a three-phase isolation transformer 5, rectification and filtering Circuit 6. Wherein the input voltage dividing capacitor unit 1 includes the input DC voltage V in , the voltage divider capacitor C d1 and C d2 , the capacity is large and equal, and its voltage is the input voltage V in half of the V in / 2, voltage dividing capacitor C d1 、C d2 can be regarded as the voltage V in / 2 voltage source. The half-bridge three-level unit 2 includes a switching tube Q 1 , Q 3 , Q 4 and Q 6 and their respective body diodes and parasitic capacitances, the freewheeling diode D f1 and D f2 and the flying capacitor C ss . Full bridge un...

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Abstract

The invention discloses a three-phase three-level LLC resonance direct current converter which comprises an input voltage partial capacitor unit, a half-bridge three-level unit, a full-bridge unit, a resonance network, a three-phase isolation transformer and a rectification and filter circuit. The input voltage partial capacitor unit, the half-bridge three-level unit, the full-bridge unit, the resonance network, the three-phase isolation transformer and the rectification and filter circuit are sequentially connected. According to the three-phase three-level LLC resonance direct current converter, as the resonance network is additionally arranged, the soft-switching function of the three-phase three-level LLC resonance direct current converter is achieved, and switching losses are reduced. The invention further discloses a control method of the three-phase three-level LLC resonance direct current converter. Frequency converting control is adopted to the control method, ZVS of a switching tube and ZCS of an auxiliary edge rectifier tube can be achieved within a wide voltage range and a wide load range, and the three-phase three-level LLC resonance direct current converter has the high efficiency and the high power density.

Description

technical field [0001] The invention relates to a three-phase three-level LLC resonant DC converter and a control method thereof, belonging to the field of electric energy conversion devices. Background technique [0002] With the wide application of various power electronic equipment, people put forward strict requirements on the power quality of power conversion devices using mains power. The International Electrotechnical Commission has formulated corresponding standards to limit the harmonic content, which requires the use of power factor correction technology for electrical devices. Medium and high-power high-frequency switching power supplies are generally three-phase 380VAC±20% input, and the rectified DC bus voltage will reach a maximum of about 640V; if the three-phase power factor technology is used, the DC bus voltage will usually reach 760-800V, It may even be as high as thousands of volts, which greatly increases the voltage stress of the switch tube in the sub...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/483
CPCY02B70/1433Y02B70/10
Inventor 刘福鑫胡高平金峰阮新波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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