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Low voltage wide input push-pull positive stimulate three level DC converter and controlling method thereof

A technology of push-pull forward excitation and control method, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and controlling/regulating systems.

Inactive Publication Date: 2010-08-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sum of the voltage stresses of all power switch tubes in the two working modes is the same as that of the traditional push-pull forward DC converter, which is 4 times the input voltage, and the traditional push-pull forward three-level DC converter generally requires flying capacitor clamps Bit power switch voltage

Method used

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  • Low voltage wide input push-pull positive stimulate three level DC converter and controlling method thereof
  • Low voltage wide input push-pull positive stimulate three level DC converter and controlling method thereof
  • Low voltage wide input push-pull positive stimulate three level DC converter and controlling method thereof

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Embodiment Construction

[0018] As shown in Figure 1. Low voltage wide input push-pull forward three-level DC converter, including input voltage dividing capacitor circuit 1 and rectification and filtering circuit 5, wherein input voltage dividing capacitor circuit 1 includes input power supply U in , the first input voltage dividing capacitor C 1 , the second input voltage dividing capacitor C 2 , the rectification and filtering circuit 5 includes four rectification diodes, that is, the first rectification diode D 1 to the fourth rectifier diode D 4 , filter inductance L f , filter capacitor C f ;Input power U in The anode of the first input divider capacitor C is connected 1 The positive terminal of the input voltage dividing capacitor circuit 1 constitutes the positive output terminal of the input power supply U in Connect the negative pole of the second input voltage dividing capacitor C 2 The negative terminal of the input voltage dividing capacitor circuit 1 constitutes the negative outp...

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Abstract

The invention discloses a low voltage wide input push-pull forward three-level direct current convertor and a method for controlling the convertor, which belong to direct current convertors and methods for controlling the convertors. The convertor of the invention is composed of an input dividing capacitance circuit, a first level branch, a second level branch, a third level branch, a clamping capacitor, an insulating transformer, a rectifier bridge and a filter circuit. The method for controlling the convertor of the invention comprises: driving signals of a first power switch tube and a fifth power switch tube are complementary, the driving signals of a fourth power switch tube and a sixth power switch tube are complementary, two working modes of three levels and two levels exist, in the three level working mode, a second power switch tube and a third power switch tube are conducted complementarily for 180 degrees, the first power switch tube and the fourth power switch are modulated by PWM, in two level working mode, the first power switch tube and the fourth power switch tube are cut normally, the fifth power switch tube and the sixth power switch tube are conducted normally, and the second power switch tube and the third power switch tube work by PWM. The invention reduces the conducting loss, improves the conversion efficiency, and saves a flying capacitor.

Description

technical field [0001] The invention relates to a DC converter of an electric energy conversion device and a control method thereof, in particular to a low voltage wide input push-pull forward three-level DC converter and a control method thereof. Background technique [0002] With the continuous shortage of fossil energy and the aggravation of environmental pollution, the distributed power generation system based on new energy and renewable energy has become a research hotspot, and the direct-to-direct converter is an important part of it. And new energy and renewable energy, such as: fuel cells, photovoltaic cells, etc., the output voltage changes with the change of load and environment, and the range of change is wide. In addition to reducing the voltage stress of the power switch tube, the traditional push-pull forward three-level DC converter is also suitable for wide input voltage applications because it can work in two modes: three-level and two-level. However, the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/337
Inventor 姚志垒王勤肖岚严仰光
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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