Control system and method of hybrid cascaded H-bridge rectifier, output voltage ratio of which being 1: 2

A technology of output voltage and hybrid cascading, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of few researches on multi-level rectifiers, and achieve low switching frequency, The effect of reducing volume and weight and improving system efficiency

Inactive Publication Date: 2018-03-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Considering the combination of hybrid cascaded inverters with a voltage ratio of 1:2, which is relatively more researched now, the independent power supply generated by rectification is just used as the inverter input, while the existing research on multilevel rectifiers with asymmetric DC side voltage rare

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  • Control system and method of hybrid cascaded H-bridge rectifier, output voltage ratio of which being 1: 2
  • Control system and method of hybrid cascaded H-bridge rectifier, output voltage ratio of which being 1: 2
  • Control system and method of hybrid cascaded H-bridge rectifier, output voltage ratio of which being 1: 2

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Embodiment Construction

[0023] The present invention will be further explained below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, the main circuit of the cascaded H-bridge rectifier includes an AC input power supply, an input filter inductor, a low-voltage H-bridge unit and a high-voltage H-bridge unit, and two filter capacitors C connected in parallel with the DC side outputs of the low-voltage H-bridge unit and the high-voltage H-bridge unit 1 、C 2 and load, the first to fourth switching tubes Q 11 ~Q 14 The composition output voltage is u dc1 The low-voltage H-bridge unit: the fifth to eighth switching tubes Q 21 ~Q 24 The composition output voltage is u dc2 The high-voltage H-bridge unit, u dc2 Generate u through the voltage divider circuit dc2 / 2, the first to eighth switching tubes all include input terminals, output terminals and control terminals, the input current flows through the filter inductor, low-voltage H-bridge unit and high-voltage H-bri...

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Abstract

The invention discloses a control system and method of a hybrid cascaded H-bridge rectifier, the output voltage ratio of which being 1: 2. By comparing total modulated wave vr1 and output vcmp of a cascaded unit 1:2 voltage division adjuster, a square wave output signal of a high-voltage unit modulator is obtained to drive a switching tube of a high-voltage unit H bridge; and a low-voltage unit modulated wave vr2 obtained after the total modulated wave vr1 subtracts the output signal of the high-voltage unit modulator 4) intersects with a high-frequency single-polarity triangular wave in positive and negative symmetry to obtain an output signal of a low-voltage unit modulator so as to drive a switching tube of a low-voltage unit H bridge. The method can obtain rectification voltage output,the voltage ratio of which is 1:2, so that the high-voltage unit switching tube having large voltage stress is allowed to work under a low frequency condition, switching loss can be greatly reduced,and meanwhile, the switching loss of a low-voltage unit having low voltage stress is also reduced; and high-frequency work can obviously reduce volume weight of a filtering device, and thus power density is improved.

Description

technical field [0001] The invention relates to a control system and method for a hybrid cascaded H-bridge rectifier with an output voltage of 1:2, and belongs to the technical field of control in electric energy conversion devices. Background technique [0002] In multi-electric aircraft, the frequency conversion AC power supply system is a developing trend. The output frequency of the generator is 360-800Hz. Some electrical equipment cannot withstand the wide range of power frequency changes. It needs to be converted into direct current (270V / 28V) or constant frequency alternating current (115V / 400Hz) through the secondary power supply system. To be used by airborne equipment. These power supply systems use autotransformer rectifiers or transformer rectifiers to achieve AC / DC conversion, and the inverter link uses a traditional bridge structure. [0003] However, ATRU has problems such as heavy weight, uncontrollable output voltage, poor three-phase unbalanced input char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/14
CPCH02M1/14H02M7/219
Inventor 陈杰戴文婧陈新龚春英
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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