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A kind of control method of bidirectional dc-dc converter

A converter and control signal technology, applied in control/regulation systems, output power conversion devices, instruments, etc., can solve the problems of complex structure and many electronic components, achieve simple structure, reduce the number of capacitors, and facilitate detection and maintenance effect

Active Publication Date: 2019-01-25
GOODWE TECHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of more electronic components and complex structures in the bidirectional DC-DC converter in the prior art

Method used

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  • A kind of control method of bidirectional dc-dc converter
  • A kind of control method of bidirectional dc-dc converter
  • A kind of control method of bidirectional dc-dc converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a bidirectional DC-DC converter, such as Figure 1A As shown, it includes a first switch network and a second switch network, the first port of the first switch network is connected to the first power supply, and the second port of the second switch network is connected to the second power supply. Wherein, the voltage of the first power source is lower than the voltage of the second power source. Usually, the first power source is a battery, and the second power source is a voltage converted from an AC bus to a DC.

[0036] The bidirectional DC-DC converter also includes: a transformer, used to transfer the energy of the first side and the second side to each other. The first side of the transformer is connected to the first switching network through the inductor, and the second side of the transformer is connected to the second switching network through the capacitor and the inductor, that is, the second side of the transformer forms an LC serie...

Embodiment 2

[0048] This embodiment provides a method for controlling the conversion of electric energy from a first power source to a second power source, which is used in the controller of the bidirectional DC-DC converter described in Embodiment 1, and the method includes:

[0049] S10: Control the switching tubes of SD1 and SD4 to be closed, and at the same time, the switching tube of SD7 is closed.

[0050] When the switch tube S1 of SD1 and the switch tube S4 of SD4 are closed, and the switch tube S7 of SD7 is closed, the current loop is as follows Figure 2A As shown, at this time, the inductors Lr1 and Lr2 are in the energy storage state, and the electric energy is transferred from the first power supply DC1 to Lr1 and Lr2.

[0051] S20: control the switching tubes of SD1 and SD4 to be closed, and at the same time, the switching tube of SD7 is turned off.

[0052] When the switch tube S1 of SD1 and the switch tube S4 of SD4 are closed, and the switch tube S7 of SD7 is opened, the ...

Embodiment 3

[0062] This embodiment provides a method for controlling the conversion of electric energy from the second power source to the first power source, which is used in the controller of the bidirectional DC-DC converter described in Embodiment 1. The method includes:

[0063] S50: control the switch tubes of SD6 and SD7 to be closed, and at the same time, the switch tubes of SD2 and SD3 to be closed.

[0064] When the switch tube S6 of SD6 and the switch tube S7 of SD7 are closed, and the switch tube S2 of SD2 and the switch tube S3 of SD3 are closed, the current loop is as follows Figure 3A As shown, at this time, the electric energy is converted from the second power supply DC2 to the first power supply DC1; at the same time, the inductors Lr1 and Lr2 are in the energy storage state, and the electric energy is also transferred to Lr1 and Lr2.

[0065] S60: control the switching tube of SD6 to close, the switching tube of SD7 to open, and at the same time, the switching tubes of S...

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Abstract

The invention discloses a bidirectional DC-DC converter and a control method. The bidirectional DC-DC converter comprises a first switch network and a second switch network, wherein a first port of the first switch network is connected with a first power supply, a second port of the second switch network is connected with a second power supply, the voltage of the first power supply is smaller than the voltage of the second power supply, the bidirectional DC-DC converter also comprises a transformer, the transformer is used for mutually transferring energy between a first side and a second side, the first side of the transformer is connected with the first switch network by an inductor, and the second side of the transformer is connected with the second switch network by a capacitor and an inductor. By arranging the capacitor at the second side of the transformer, the requirement for a voltage resistant range of the capacitor can be reduced, the number of capacitors in parallel is reduced, and thus, the cost of the bidirectional DC-DC converter is reduced. The bidirectional DC-DC converter is simple in structure and is convenient to detect and maintain.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a control method for a bidirectional DC-DC converter. Background technique [0002] A DC converter is a device that converts direct current into another required direct current, that is, converts the input of large voltage and low current into a small voltage and high current through a DC converter or converts the input of small voltage and high current through a converter Into large voltage and small current. Because the main power transmission path in a general unidirectional DC converter uses a unidirectional conduction device, the energy transfer direction of the DC converter can only be in one direction, and cannot be transferred in the opposite direction. In other fields, such as aerospace power systems, electric vehicles, and DC uninterruptible power supply systems, DC converters with bidirectional energy flow are required in these fields. [0003] Ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353H02M3/33561
Inventor 黄敏许金韡万建徐卫军刘滔
Owner GOODWE TECHNOLOGIES CO LTD
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