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Method and system for reducing input circulating current of multiple non-isolated modules operating in parallel

A non-isolated, current-input technology, applied in parallel operation of DC power supplies, irreversible AC power input conversion to DC power output, DC power input conversion to DC power output, etc., can solve the problem of total output power reduction and module M_A overheating damage and other problems, to achieve the effect of eliminating input circulation, reducing or input circulation

Active Publication Date: 2021-06-11
DELTA ELECTRONICS (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the existence of this input circulation not only causes the total output power to be greatly reduced, but also may cause module M_A to be overheated and damaged if it works for a long time

Method used

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  • Method and system for reducing input circulating current of multiple non-isolated modules operating in parallel
  • Method and system for reducing input circulating current of multiple non-isolated modules operating in parallel
  • Method and system for reducing input circulating current of multiple non-isolated modules operating in parallel

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Embodiment Construction

[0068] In order to make the description of the present invention more detailed and complete, reference may be made to the attached drawings and various embodiments described below, and the same numbers in the drawings represent the same or similar components. On the other hand, well-known components and steps have not been described in the embodiments in order not to limit the invention unnecessarily. In addition, for the sake of simplifying the drawings, some known and conventional structures and elements will be shown in a simple and schematic manner in the drawings.

[0069] Moreover, when an element is "connected", "coupled" or "disposed" to another element herein, it may mean that the element is directly connected, directly coupled or directly disposed on another element, or it may refer to a certain An element is indirectly connected, coupled or disposed indirectly to another element, that is, there are other elements interposed between the element and another element. ...

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Abstract

The invention discloses a method and system for reducing input circulation of multiple non-isolated modules running in parallel. Among them, the input ends and output ends of multiple non-isolated modules are respectively connected in parallel, and each non-isolated module includes a first-stage converter, a bus capacitor and a second-stage converter that are electrically connected in sequence, wherein, for each non-isolated An isolation module, the method includes: comparing the first signal reflecting the input power of the non-isolation module with a reference value to obtain a comparison result; adjusting the voltage of the bus capacitor of the non-isolation module according to the comparison result, when the comparison result is the first When the signal is greater than the reference value, the voltage of the bus capacitor of the non-isolated module is reduced, and when the comparison result is that the first signal is smaller than the reference value, the voltage of the bus capacitor of the non-isolated module is increased. According to the comparison result between the first signal and the reference value, the invention can adjust the busbar voltage of the busbar capacitor in the non-isolated module, so as to eliminate the input circulation among multiple non-isolated modules running in parallel.

Description

technical field [0001] The invention relates to a method and system for reducing input circulation of multiple non-isolated modules operating in parallel. Background technique [0002] In digital power control, the non-isolated modules of the secondary architecture have the advantages of high efficiency and high power density compared with the isolated modules of the secondary architecture. However, when the input and output of the modules are connected in parallel to work together, it is easy to have input circulation between the modules. As a result, the input current of some modules is too large to trigger the current limit, resulting in the total output power of the system not reaching the rated value, and in severe cases, some modules may even be damaged due to excessive input current. [0003] For example, for the AC / DC non-isolated modules of the two-level architecture, when running in parallel, the input circulation will be generated between the parallel modules due ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00H02J1/10
CPCH02M1/00H02M1/0038H02M3/1584H02M7/06H02M1/0022H02M1/0048H02M1/007H02M1/327H02M3/1586Y02B70/10
Inventor 刘红光白新民
Owner DELTA ELECTRONICS (SHANGHAI) CO LTD