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An isolated bidirectional dc-dc converter

A DC-DC and converter technology, applied in the field of isolated bidirectional DC-DC converters, can solve the problems of the control effect not meeting the requirements, sacrificing the power transmission capability or soft switching characteristics of the converter, etc.

Active Publication Date: 2016-04-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution can reduce or eliminate the backflow power, but it often sacrifices the power transmission capability or soft switching characteristics of the converter, and the control effect is still not up to the requirement

Method used

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  • An isolated bidirectional dc-dc converter
  • An isolated bidirectional dc-dc converter
  • An isolated bidirectional dc-dc converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1: first and second inductance L k1 , L k2 The other end is connected to the busbar as the first structure, when the energy from U 1 Lateral U 2 Each switching mode during side transmission, one cycle can be divided into 6 switching modes, among which the first 3 switching modes and the last 3 switching modes are semi-circularly symmetrical, so only the first 3 switching modes need to be analyzed. Can. where the primary side regulator capacitor C 1 The voltage across the terminal is U 1 , the secondary side regulator capacitor C 2 The voltage across the terminal is U 2 .

[0056] In this example, if image 3 As shown, the first power switch S 1 and the second power switch S 2 The driving pulse is complementary, the first power switch S 1 The drive pulse width is always greater than the second power switch S 2 the drive pulse width. The third power switch tube S 3 and the fourth power switch S 4 The driving pulse is complementary, the third powe...

Embodiment 2

[0060] Embodiment 2: first and second inductance L k1 , L k2 The other end is connected to the busbar as the first structure, when the energy from U 2 Lateral U 1 Each switching mode during side transmission, one cycle can be divided into 6 switching modes, among which the first 3 switching modes and the last 3 switching modes are semi-circularly symmetrical, so only the first 3 switching modes need to be analyzed. Can. Primary side regulator capacitor C 1 The voltage across the terminal is U 1 , the secondary side regulator capacitor C 2 The voltage across the terminal is U 2 .

[0061] In this example, if Figure 7 As shown, the first power switch S 1 , the third power switch tube S 3 Always in off state, no need to provide drive pulse. Fifth power switch tube S 5 , the sixth power switch tube S 6 The driving pulses are complementary, the pulse widths are equal and there is a dead time; the seventh power switch tube S 7 , the eighth power switch tube S 8 The d...

Embodiment 3

[0066] Embodiment 3: first and second inductance L k1 , L k2 The other end is connected to the busbar as the second structure, when the energy is from U 1 Lateral U 2 Each switching mode during side transmission, one cycle can be divided into 6 switching modes, among which the first 3 switching modes and the last 3 switching modes are semi-circularly symmetrical, so only the first 3 switching modes need to be analyzed. Can. Primary side regulator capacitor C 1 The voltage across the terminal is U 1 , the secondary side regulator capacitor C 2 The voltage across the terminal is U 2 .

[0067] In this example, if Figure 11 As shown, the first power switch S 1 and the second power switch S 2 The driving pulse is complementary, the second power switch S 2 The driving pulse width is always greater than the first power switch S 1 The driving pulse width; the third power switch S 3 and the fourth power switch S 4 The driving pulse is complementary, the fourth power swi...

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Abstract

The invention relates to an isolated bi-directional DC (direct current)-DC converter, comprising a primary side converter, wherein the primary side convertor consists of a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a first inductor and a second inductor, the first power switch tube and the second power switch tube are connected in series by the first inductor for forming a first bridge arm, the third power switch tube and the fourth power switch tube are connected in series by the second inductor for forming a second bridge arm, a primary side voltage stabilizing capacitor is connected between a positive bus-bar and a negative bus-bar of the primary side converter, one end of the first inductor is connected with a primary winding of an isolating transformer, the other end of the first inductor is connected with the bus-bars of the primary side converter via a first diode, one end of the second inductor is also connected with the primary winding of the isolating transformer, the other end of the second inductor is connected with the bus-bar of the primary side converter via a second diode, a secondary winding of the isolating transformer is connected with the input end of a secondary side converter, and a secondary side voltage stabilizing capacitor is connected between a positive bus-bar and a negative bus-bar of the output end of the secondary side converter. The isolated bi-directional DC-DC converter can be widely used in the technical field of power electronic converters.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to an isolated bidirectional DC-DC converter for energy bidirectional transmission from DC power to DC power. Background technique [0002] Bidirectional DC-DC Converters (Bidirectional DC-DC Converters) are DC-to-DC converters that can adjust energy bidirectional transmission as needed. Mainly used in DC uninterruptible power supply systems, aerospace power systems, DC motor drive systems, hybrid energy electric vehicles and other occasions. The isolated bidirectional DC-DC converter uses a transformer to achieve electric energy conversion with electrical insulation by using magnetic coupling. Since the turn ratio of the primary and secondary coils of the transformer can be designed, a reasonable selection of the turn ratio can make the converter operate under better conditions. Work, obtain higher or very low voltage, and achieve a larger voltage transformatio...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/5387H02M7/219
Inventor 黄震孙凯张犁
Owner TSINGHUA UNIV
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