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LLC resonant converter, and control circuit and resonance current sampling circuit thereof

A resonant converter and resonant current technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve the problems of bridge arm switch control, low converter efficiency, and inability to obtain resonant current. Achieve the effect of reducing switching loss and improving accuracy

Pending Publication Date: 2018-08-17
SHENZHEN EN PLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the switching tube realizes hard switching when it is turned off, since the controller of the LLC resonant DC converter cannot obtain the resonant current, it cannot control the bridge arm switch to achieve the ZVS of the switching tube, and the efficiency of the converter is low

Method used

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  • LLC resonant converter, and control circuit and resonance current sampling circuit thereof
  • LLC resonant converter, and control circuit and resonance current sampling circuit thereof
  • LLC resonant converter, and control circuit and resonance current sampling circuit thereof

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Embodiment Construction

[0022] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. Wherein, similar elements in different implementations adopt associated similar element numbers. In the following implementation manners, many details are described for better understanding of the present application. However, those skilled in the art can readily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the application are not shown or described in the description, this is to avoid the core part of the application being overwhelmed by too many descriptions, and for those skilled in the art, it is necessary to describe these operations in detail Relevant operations are not necessary, and they can fully understand the relevant operations according to the description in the specification and genera...

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Abstract

The invention provides an LLC resonant converter, and a control circuit and a resonance current sampling circuit thereof. An inductor is connected with a resonant cavity of the LLC resonant converterto sense a resonance current of the resonant cavity and convert the resonance current to an AC induction voltage so that a voltage conversion sub-circuit converts the AC induction voltage to a DC voltage and outputs the DC voltage to a controller; and therefore, real-time sampling of the resonance current is realized, basis is provided for further control of the controller, and through the controlof a switch-off current of a switch tube, the switching loss of a bridge arm switch can be reduced, and the control accuracy of the controller is improved.

Description

technical field [0001] The invention relates to the field of LLC resonant converters, in particular to an LLC resonant converter, a control circuit thereof, and a resonant current sampling circuit. Background technique [0002] With the development of the new energy industry, the demand for the charging pile industry is increasing day by day. At the same time, the requirements for the power level of the charging pile are increasing day by day. The 10KW-20KW DC charging module has begun to be popularized. In the current AC / DC DC module, DC / DC mostly adopts a three-level LLC resonant DC converter, which can reduce the voltage stress of the switching tube to half of the input DC bus (DC700V-850V), select low-voltage devices in the case of high-voltage input, and at the same time The LLC resonant DC converter can not only realize the ZVS of the switch tube, but also realize the ZCS of the rectifier diode, improve the conversion efficiency and reduce the electromagnetic interfer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/33569H02M1/0054Y02B70/10
Inventor 戴国峰程中原
Owner SHENZHEN EN PLUS TECH CO LTD
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