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

A technology of power converter and switch, which is applied in the direction of output power conversion device, conversion of DC power input to DC power output, instruments, etc.
CN101194412BInactive Publication Date: 2011-12-07SMA SOLAR TECH AG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SMA SOLAR TECH AG
Publication Date
2011-12-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

For converting a first DC voltage to a second DC voltage, a first bridge circuit comprised in a power converter is controlled to convert the first DC voltage to a first AC voltage. The first AC voltage is transformed to a second and possibly further AC voltage. The second and each possibly further AC voltage is converted to a DC voltage by respective bridge circuits. To increase efficiency of the power converter switches of the power converter are controlled to operate in soft switching. Thereto a duty cycle of each AC voltage is controlled. In an embodiment, a half-cycle voltage-time integral of each AC voltage is controlled to be substantially equal.
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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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