Wide range output control method for LLC resonant transformation circuit

A resonant conversion and output control technology, which is applied in the direction of converting AC power input to DC power output, DC power input to DC power output, irreversible DC power input to AC power output, etc., to achieve wide output voltage range, The effect of small output voltage ripple and high efficiency

Inactive Publication Date: 2017-09-22
NARI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is very difficult for the LLC resonant conversion circuit to meet the relatively wide output voltage range of the electric vehicle charger under the condition of competitive power density.

Method used

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  • Wide range output control method for LLC resonant transformation circuit
  • Wide range output control method for LLC resonant transformation circuit
  • Wide range output control method for LLC resonant transformation circuit

Examples

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0027] The LLC resonant conversion circuit adopted in the method of the present invention is a single applied half-bridge LLC resonant circuit or a derivative circuit formed by connecting two or more half-bridge LLC resonant circuits in parallel or in series. It can also be a single-applied full-bridge LLC resonant circuit or a derivative circuit formed by connecting two or more full-bridge LLC resonant circuits in parallel or in series.

[0028] Such as figure 1 Shown is a full-bridge LLC resonant conversion circuit suitable for the method of the present invention, and can also be applied to a full-wave rectification type LLC resonant conversion circuit. figure 1 In the circuit shown, the inp...

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Abstract

The invention discloses a wide range output control method for an LLC resonant transformation circuit. The LLC resonant transformation circuit works under different working modes depending on correlation between the output voltage and the load size. The trend is that the LLC resonant transformation circuit works under a variable frequency working mode when the LLC resonant transformation circuit is in a high output voltage or heavy load state; when the LLC resonant transformation circuit is in a low output voltage or light load state, the LLC resonant transformer works under a working mode with a fixed frequency variable effective duty ratio or under an intermittent working mode with a fixed frequency fixed effective duty ratio. According to the method provided by the invention, the wide range output voltage requirement of the LLC resonant transformation circuit can be effectively met.

Description

technical field [0001] The invention relates to a wide range output control method of an LLC resonant conversion circuit. Background technique [0002] For power electronics products, performance indicators such as cost, reliability, and efficiency are the first life of the product, and these key parts are often difficult to obtain simultaneously. Taking electric vehicle chargers as an example, there are roughly two output voltage ranges of electric vehicle chargers, 200V-500V and 300V-750V. The relatively wide output voltage range of the charger has brought certain difficulties to designers, and sometimes it is likely to be traded at the expense of efficiency, cost or other performance indicators. [0003] The LLC resonant conversion circuit is favored by people in the industry because of its advantages of high efficiency and higher power density. However, it is very difficult for the LLC resonant conversion circuit to meet the relatively wide output voltage range of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/48
CPCH02M3/33523H02M7/48H02M7/4815Y02B70/10
Inventor 丁志刚周华良杨志宏夏雨李明珠沈志浩程德荣谢明李
Owner NARI TECH CO LTD
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