Tri-level half-bridge single-stage inverter and control method

A three-level half-bridge and control method technology, applied in electrical components, AC power input into DC power output, output power conversion devices, etc. The small capacity of the flyback inverter achieves the effect of low cost, high power density and small output voltage ripple

Inactive Publication Date: 2009-04-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The capacity of the single-stage flyback inverter is small, the quality of the output voltage waveform is not high, and the application occasions are limited

Method used

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  • Tri-level half-bridge single-stage inverter and control method
  • Tri-level half-bridge single-stage inverter and control method
  • Tri-level half-bridge single-stage inverter and control method

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Embodiment Construction

[0016] figure 1 It is the schematic diagram of the main circuit topology of the three-level half-bridge single-stage inverter, and its circuit composition is: power supply U in The positive pole is connected to the first input capacitor C 11 Positive pole and the first power switch tube S 1 the drain of the power supply U in The negative terminal of is connected to the second input capacitor C 12 The negative pole and the fourth power switch tube S 4 source, the first input capacitor C 11 The negative pole of the second input capacitor C 12 The positive pole of is connected to the first transformer T 1 Primary winding N p1 The non-identical end of the second power switch S 2 source of the third power switch S 3 The drains are connected to the first transformer T 1 Primary winding N p1 Connected to the terminal of the same name, the first clamping diode D 1 The cathode is connected to the first power switch tube S 1 source and the second power switch S 2 the drain...

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Abstract

The invention provides a three-level half-bridge single-stage inverter and a control method thereof, belonging to the inverter field. One passage of voltage output circuit of the inverter consists of a power (V in ), two capacitors (C11 and C12), six power switch tubes (S1-S4, S9 and S10), two clamping diodes (D1 and D2), a transformer (T1), a filter inductor (L f1 ) and a filter capacitor (C f1 ), and another passage of voltage output circuit of the inverter consists of a power (V in ), two capacitors (C21 and C22), six power switch tubes (S5-S8, S11 and S12), two clamping diodes (D3 and D4), a transformer (T2), a filter inductor (L f2 ) and a filter capacitor (C f2 ). The inverter is formed by the differential combination of two three-level half-bridge DC converters with bidirectional power currents; the switch tube has low voltage stress and is suitable for high-voltage input sites; the load adaptability is strong and the dynamical performance is excellent. The three-level half-bridge single-stage inverter has two control methods as follows: a no-bias voltage semi-period working mode with two passages of inverters work in a half period respectively and a bias voltage full-period working mode with two passages of inverters work at the same time.

Description

technical field [0001] The invention relates to a three-level half-bridge single-stage inverter and a control method, belonging to the inverter in the field of power electronics. Background technique [0002] The widely used inverter is a static converter device that uses power semiconductor devices to convert direct current into alternating current for use with alternating current loads. The input and output electrical isolation of the traditional inverter technology uses a power frequency transformer, which has been gradually eliminated due to the shortcomings of large noise, bulkiness, and large output filter inductance, while the output AC load and the input DC power supply are isolated by a high-frequency transformer with a frequency above 20kHz The inverter is called a high-frequency link inverter. The volume, weight and audio noise of the high-frequency link inverter are greatly reduced, and the shortcomings of the low-frequency link inverter are overcome. It will re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/537
Inventor 马运东丛庆王芳胡祖荣
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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