Bidirectional DC converter and bidirectional DC conversion control method
A bidirectional DC conversion and control terminal technology, applied in the direction of DC power input conversion to DC power output, control/regulation systems, instruments, etc., can solve the problems of bidirectional converter efficiency decline and other issues
Active Publication Date: 2019-12-17
SUZHOU INOSA UNITED POWER SYST CO LTD
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Problems solved by technology
[0008] The technical problem to be solved by the present invention is to provide a new bidirectional DC converter and a bidirectional DC conversion control method in view of the problem that the efficiency of the above bidirectional converter is seriously reduced when the voltage transmission ratio varies in a large range
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[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0043] Such as Figure 5 As shown, is a schematic diagram of an embodiment of the bidirectional DC converter of the present invention, and the bidirectional DC converter can realize bidirectional energy transmission. The bidirectional DC converter in this embodiment includes a first chopping unit 51, a second chopping unit 52, a first inductor L1, a second inductor L2, a transformer Tx1, a voltage detection unit and a control unit, wherein the voltage detection unit is connected to The first external terminal V1DC is used to detect the voltage of the first external terminal V1DC; the first side of...
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The invention provides a bidirectional DC converter and a control method of bidirectional DC conversion. The bidirectional DC converter comprises a first chopping unit, a second chopping unit, a transformer, a voltage detection unit and a control unit, wherein the second chopping unit is connected to a positive bus and a negative bus, a first capacitor is arranged between the positive bus and thenegative bus, a second inductor and a second capacitor are connected in series between an intermediate tap of a secondary winding of the transformer and the negative bus, two ends of the second capacitor are connected to a second external terminal, and the control unit is used for adjusting a duty ratio of a pulse width modulation signal output to a control end of the first chopping unit accordingto a voltage of the second external terminal until a voltage measured by the voltage detection unit reaches a preset value when energy flows to the second external terminal from the first external terminal. By the bidirectional DC converter, high-efficiency energy transmission can be ensured when the bidirectional DC converter possess a relatively large transmission ratio change range.
Description
technical field [0001] The invention relates to the field of DC converters, and more specifically, to a bidirectional DC converter and a bidirectional DC conversion control method. Background technique [0002] With the continuous development of electric vehicles and the automation industry, more and more applications require two-way energy transmission. Bidirectional energy transmission can be realized by two unidirectional power converters, but this method not only has low power density but also low reliability, so bidirectional power converters emerge as the times require. [0003] Compared with the traditional unidirectional power converter, although the power density of the bidirectional power converter is improved, its efficiency and other characteristics will be reduced. Based on this, realizing high-efficiency, high-power-density bidirectional power converters is one of the key research points in the power supply industry today. [0004] Such as figure 1 Shown is ...
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IPC IPC(8): H02M3/335
CPCH02M3/33584
Inventor 蒙杰成
Owner SUZHOU INOSA UNITED POWER SYST CO LTD