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lclc resonant circuit, wide range constant power output DC charger and control method

A technology of resonant circuit and charging machine, which is applied in the direction of converting AC power input to DC power output, electric vehicle charging technology, irreversible DC power input conversion to AC power output, etc., which can solve the problem of LLC converter efficiency reduction and power MOS Increased switching loss of tubes, increased switching frequency and other issues, to achieve the effect of significantly improved efficiency, high overall working efficiency, and wide voltage output range

Active Publication Date: 2020-03-24
SHANDONG LUNENG SOFTWARE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the LLC resonant circuit also has its inherent disadvantages: due to its slow output / input gain curve, the switching frequency increases when the low voltage is output, the switching loss of the power MOS tube increases, and the efficiency of the LLC converter decreases.
[0008] None of the above categories can meet the needs of all car charging, thus increasing the complexity and cost of car charging facilities in a disguised form, and affecting the charging experience of customers

Method used

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  • lclc resonant circuit, wide range constant power output DC charger and control method
  • lclc resonant circuit, wide range constant power output DC charger and control method
  • lclc resonant circuit, wide range constant power output DC charger and control method

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Embodiment Construction

[0046] The present invention is described in detail below in conjunction with accompanying drawing:

[0047] Compared with the existing DC charger based on the traditional LLC resonance technology, the present invention mainly improves the LLC resonance circuit of the charger and its control mode, thereby widening its voltage output and constant power range, and improving its overall performance. runtime efficiency. The details will be described below.

[0048] On the one hand, the invention discloses an LCLC resonant circuit, comprising: a series-parallel resonant network composed of a series resonant inductor, a series resonant capacitor and a parallel resonant inductor; capacitors are connected in series on the branches of the parallel resonant inductor. A full-bridge LLC series resonant circuit is used for illustration.

[0049] figure 2 For the traditional LLC full bridge resonant circuit. image 3 It is an improved LCLC full bridge resonant circuit.

[0050] In the...

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Abstract

The invention discloses an LCLC resonant circuit, a wide range constant power output DC charger and a control method, comprising: a series-parallel resonant network composed of a series resonant inductor, a series resonant capacitor and a parallel resonant inductor; Connect capacitors in series. Beneficial effects of the present invention: the charger designed by the present invention has a wider voltage output range, and the output range is 750-200V; at the same time, the charger designed by the present invention has higher overall working efficiency, especially when the charger is output at low voltage, the efficiency is significantly improved .

Description

technical field [0001] The invention relates to the field of DC charging of new energy electric vehicles, in particular to an LCLC resonant circuit, a wide range constant power output DC charger based on LCLC resonant technology and a control method thereof. Background technique [0002] The LLC resonant circuit is a circuit that has attracted the attention of the industry recently, and its theoretical research has been relatively mature. Compared with the traditional hard switching technology, it has some obvious advantages: it can realize the ZVS turn-on of the MOS tube in the variable frequency range, thereby reducing the switching loss of the circuit and improving the efficiency of the converter; when the switching frequency is lower than or equal to The rectifier diode is naturally turned off at the resonant frequency, which eliminates the turn-off loss and voltage peak of the rectifier part; the current waveform is a sine wave, and the conduction and radiation interfer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/04H02M7/48B60L53/20
CPCB60L53/20H02J7/045H02M7/48H02M7/4815Y02T10/70Y02T10/7072Y02T10/92Y02T90/14
Inventor 杨勇杨军虎丁玉华刘爱忠黄厚诚孙永亮于波峰唐亮冯立玮马桂荣
Owner SHANDONG LUNENG SOFTWARE TECH
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