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Current- sharing control method for interleaved parallel LLC

A flow control and parallel technology, applied in control/regulation system, output power conversion device, DC power input conversion to DC power output, etc., can solve problems such as complex control, improve power density, and improve circuit uneven current , the effect of effective control

Pending Publication Date: 2021-03-19
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to detect the zero-crossing point of the resonant current in real time, and the control is complicated

Method used

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  • Current- sharing control method for interleaved parallel LLC
  • Current- sharing control method for interleaved parallel LLC
  • Current- sharing control method for interleaved parallel LLC

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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] The present invention provides a current sharing control method of interleaved parallel LLC, specifically:

[0047] Step 1, design the LLC circuit:

[0048] The LLC resonant converter is composed of three modules: inverter network, resonant cavity and rectifier filter network, such as figure 1 As shown, the interleaved parallel LLC circuit is composed of two sets of basic LLC circuits, and adopts the method of input parallel connection and output parallel connection, such as figure 2 shown;

[0049] LLC1 circuit consists of inverter circuits Q1, Q2, Q3, Q4, resonant network Lr1 、C r1 , L m1 , transformer T1 and rectifier circuit D1, D2, D3, D4; the connection mode is that the power supply is connected to the input of the inverter circuit, the output terminal is connected to the resonant network, the primary and secondary sides of ...

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Abstract

The invention discloses a current-sharing control method for interleaved parallel LLC, and the method comprises the steps: designing LLC circuits, enabling the two LLC circuits to be connected in parallel, forming an LLC circuit parallel system, enabling the input ends of the LLC circuits to be connected in parallel, and enabling the output ends of the LLC circuits to be connected in parallel; anddesigning and determining key parameters, carrying out steady-state modeling on the designed interleaved parallel LLC circuits, obtaining gain expressions before and after introducing a phase shift angle, and then analyzing the steady-state model and the expressions to show the feasibility of the scheme. Current sharing control is carried out on the interleaved parallel LLCs, the interleaved parallel LLC stability can be well improved, the power density is improved, the non-uniform flow degree can be effectively controlled, the influence of the module and parameters on the circuit is reduced,the excellent characteristics of the product are improved, and the problem of non-uniform flow of the circuit is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of interleaved parallel LLC resonant converters, and relates to a current sharing control method of interleaved parallel LLCs. Background technique [0002] With the development of power supply products, high frequency, high efficiency, and high power density have become the development trend. Since the LLC resonant converter can realize soft switching in the full load range, it is more and more widely used. However, due to its large output current ripple, if the filter device is added, the volume of the product will inevitably increase, and the final output will also increase. cost, and the LLC converter is not suitable for high-power occasions. Moreover, the development of technology has made electric vehicles the mainstream of this era. Problems such as the small number of charging piles, long charging time for vehicles, and low charging efficiency have emerged. Based on this, This problem can be solved ...

Claims

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Application Information

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IPC IPC(8): H02M3/335H03H7/42
CPCH02M3/33569H03H7/42
Inventor 尹有为许烨文赵金伟张少杰潘加阳
Owner XIAN UNIV OF TECH
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