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Method for operating a power converter in a soft-switching range

A power converter and switch technology, which is used in output power conversion devices, DC power input conversion to DC power output, instruments, etc., can solve problems such as complex voltage elimination methods

Inactive Publication Date: 2008-06-04
SMA SOLAR TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the DAB and TAB converter structures described above, the voltage cancellation method is complicated to implement, for example, due to the use of look-up tables

Method used

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  • Method for operating a power converter in a soft-switching range
  • Method for operating a power converter in a soft-switching range
  • Method for operating a power converter in a soft-switching range

Examples

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Embodiment Construction

[0033]Figure 1 shows an embodiment of a dual active bridge power converter 10 according to the present invention. The power converter 10 includes: a first port 20 including port terminals 21 and 22 ; a first bridge circuit 30 including switches 31 - 34 and nodes 35 , 36 . The transformer 40 of the power converter 10 includes a first number of turns N 1 The first winding 41 and has a second number of turns N 2 The second winding 43. The power converter 10 further includes: a second bridge circuit 50 including switches 51 - 54 and nodes 55 , 56 ; and a second port 60 including port terminals 61 and 62 .

[0034] A power source 70 may be coupled to port terminals 21 and 22 . In operation, the source voltage V s Applied to port terminals 21 and 22. Load 80 may be coupled to port terminals 61 and 62 . In operation, the load voltage V 1 May be present between port terminals 61 and 62. Also, in operation, the first rectangular pulse wave voltage V w1 may be presented between...

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Abstract

In order to convert the first DC voltage into a second DC voltage, a first bridge circuit included in the power converter is controlled to convert the first DC voltage into a first AC voltage. This first AC voltage is transformed into a second and possibly further AC voltage. The second and possibly further AC voltages are converted into DC voltages via respective bridge circuits. In order to increase the efficiency of the power converter, the switches of the power converter are controlled to operate in soft switching. Additionally, the duty cycle of each AC voltage is controlled. In one embodiment, the half-cycle voltage-time integral of each AC voltage is controlled to be substantially equal.

Description

technical field [0001] The present invention relates to a method of operating a power converter in a soft switching range and to a power converter configured to operate in a soft switching range. Background technique [0002] Power converters are known in the art to be used to supply power from a power source to a load, where specific characteristics of the power source are incompatible with specific characteristics of the load, such as rated voltage and operating voltage, respectively. [0003] For DC / DC conversion, a Dual Active Bridge (DAB) converter is known. The DAB converter converts a DC voltage of a power source coupled to a first port to an AC voltage using a first active bridge. This AC voltage is transferred to the second active bridge using an electromagnetic coupling device such as a transformer. A second active bridge converts the AC voltage to a DC voltage. The DC voltage is provided to a second port of the power converter. In this way, the power converter...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33584
Inventor H·陶A·科特索波洛斯J·L·杜阿特M·A·M·亨德里克斯
Owner SMA SOLAR TECH AG
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