Bootstrap boosting SEPIC converter based on synchronous rectification technology

A technology of synchronous rectification and bootstrap boost, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., and can solve the problems of reducing the overall efficiency of SEPIC converters and reducing the output current level of converters, etc. , to achieve the effect of reducing circuit loss, increasing output current level, and optimizing circuit structure

Inactive Publication Date: 2019-10-29
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing SEPIC converter realizes the rectification switching function through the diode, and the forward conduction voltage drop of the diode will increase with the increase of the conduction current, which will eventually lead to a large current flowing through the diode. , the power dissipation on the rectifier diode accoun

Method used

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  • Bootstrap boosting SEPIC converter based on synchronous rectification technology

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[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0026] In order to make the above objectives, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] As attached figure 1 Shown is the working principle diagram of the SEPIC converter of the present invention, which includes a synchronous rectifier circuit and a bootstrap b...

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Abstract

The invention discloses a bootstrap boosting SEPIC converter based on a synchronous rectification technology. The converter comprises a synchronous rectification circuit and a bootstrap boosting driving circuit. The synchronous rectification circuit increases current allowed to pass the circuit, and the bootstrap boosting driving circuit realizes synchronous rectification. According to the invention, a power type N-channel MOSFET with small on-resistance is used as a rectification switch triode; a grounding switch triode and the rectification switch triode are in opposite order of conduction and have complementary on-time; by controlling the working order of the grounding switch triode and the rectification switch triode, the synchronous rectification function of the synchronous rectification SEPIC converter is realized; in addition to switching loss in the circuit, the loss on the rectification switch triode is only the loss caused by extremely low on-resistance; in the case of high duty ratio, the circuit loss is greatly reduced, and the overall efficiency of the SEPIC converter is improved; and the output current level of the SEPIC converter is improved while taking into accountthe heat dissipation package and heat dissipation conditions of a rectification component.

Description

technical field [0001] The invention relates to a device and method for a bootstrap boost SEPIC converter based on synchronous rectification technology, which belongs to the field of power supplies, and in particular relates to a SEPIC converter. Background technique [0002] With the development of life and industry, the requirements for power converters are getting higher and higher. Power converters with both step-up and step-down functions are used in battery charging and discharging, super capacitor charging and discharging, automotive applications, and need to provide multiple inputs. There are more and more applications in fields such as photovoltaic power generation systems with a large output voltage range, so the research on power converters has become particularly important. [0003] The single-ended primary winding inductive converter (SEPIC) is a step-up-buck converter that allows the output voltage to be greater than, less than or equal to the input voltage of ...

Claims

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Application Information

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IPC IPC(8): H02M3/155H02M3/158
CPCH02M3/155H02M3/1588H02M1/0048H02M3/1557Y02B70/10
Inventor 山炳强任宝森张睿尹国慧隋宗强刘键铭赵广方赵国栋吕云扬刘香
Owner QINGDAO UNIV
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