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Power converting unit, large step-up ratio composite-structure bridge type impedance network DC/DC (Direct Current/Direct Current) converter and control method of converter

A technology of conversion unit and impedance network, which is applied in the field of fuel cell power generation system, can solve the problems of fuel cell efficiency and low boost ratio, and achieve the effects of high boost multiple, maintaining efficiency, and flexible operation

Pending Publication Date: 2019-03-01
北京中科绿能科技有限公司
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  • Application Information

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Problems solved by technology

[0005] In view of this, the present application provides a power conversion unit, a large boost ratio combined structure bridge-type impedance network DC / DC converter and a control method to solve the problem of low efficiency and low boost ratio of existing fuel cells

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  • Power converting unit, large step-up ratio composite-structure bridge type impedance network DC/DC (Direct Current/Direct Current) converter and control method of converter
  • Power converting unit, large step-up ratio composite-structure bridge type impedance network DC/DC (Direct Current/Direct Current) converter and control method of converter
  • Power converting unit, large step-up ratio composite-structure bridge type impedance network DC/DC (Direct Current/Direct Current) converter and control method of converter

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Embodiment Construction

[0015] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0016] The technical solutions provided by various embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0017] The fuel cell vehicle power system configuration is as follows: figure 1 As shown, the system consists of a fuel cell engine (FCE), a DC / DC converter, a battery (Battery), ...

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Abstract

The invention discloses a power converting unit, a large step-up ratio composite-structure bridge type impedance network DC / DC (Direct Current / Direct Current) converter and a control method of the converter. The power converting unit comprises a bridge type impedance network circuit, a half bridge-structure power device unit and a DC capacitor. The DC / DC converter comprises the power converting unit, a power supply V1, an isolated full-bridge DC / DC converter and a power supply V2, wherein the positive pole and the negative pole of the power supply V1 are correspondingly connected with the positive pole and the negative pole of the input end of the power converting unit; the positive pole and the negative pole of the output end of the power converting unit are correspondingly connected withthe positive pole and the negative pole of the input end of the isolated full-bridge DC / DC converter; and the positive pole and the negative pole of the output end of the isolated full-bridge DC / DC converter are correspondingly connected with the positive pole and the negative pole of the power supply V2. According to the control method, four working modes of series resonance, parallel resonance,bidirectional power flow and unidirectional power flow of the DC / DC converter are realized by controlling the topology structure of a circuit through a bidirectional switch. The power switch has a soft switching operating environment; the energy bidirectional power flow operation is realized; and the converter has the characteristics of high boosting multiple and high efficiency.

Description

technical field [0001] The present application relates to the field of fuel cell power generation systems, in particular to a power conversion unit, a DC / DC converter and a control method. Background technique [0002] In recent years, due to environmental pollution and energy security considerations, the research and development of electric vehicles has developed rapidly. Electric vehicles include three categories: pure electric vehicles, hybrid vehicles and fuel cell electric vehicles. Fuel cell electric vehicles are considered to be the ultimate development direction of electric vehicles in the 21st century. At present, there is an upsurge of research and development of fuel cell electric vehicles in domestic and foreign business circles. DC / DC converter is a key technology of fuel cell electric vehicles. [0003] Fuel cells in the prior art generally use low-voltage and high-current systems, so the fuel cell DC / DC converter requires a very high boost ratio (greater than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M3/335B60L15/00B60L50/51
CPCH02M3/158H02M3/33584B60L15/007H02M1/0058H02M1/007Y02T10/72Y02T10/70
Inventor 许海平原增泉温平平
Owner 北京中科绿能科技有限公司
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