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LLC resonant circuit, control method and LLC resonant converter

A technology of resonant circuit and resonant capacitor, which is applied in the fields of adjusting electrical variables, control/regulating systems, and high-efficiency power electronic conversion. The effect of the flow effect

Inactive Publication Date: 2020-11-13
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an LLC resonant circuit, a control method and an LLC resonant converter to solve the problems of poor current sharing effect and poor reliability among modules in the related art

Method used

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  • LLC resonant circuit, control method and LLC resonant converter
  • LLC resonant circuit, control method and LLC resonant converter
  • LLC resonant circuit, control method and LLC resonant converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] see figure 1 , figure 1 It is a structural diagram of an LLC resonant circuit provided by an embodiment of the present application.

[0059] like figure 1 As shown, this embodiment provides an LLC resonant circuit, which is applied to a series-type two-channel common-inductance LLC resonant converter, including: a capacitor unit 1, a first half-bridge circuit 2, a second half-bridge circuit 3, and two common-inductance LLC resonant converters. Inductive dual resonant cavity 4, first transformer T1, second transformer T2, first rectifier circuit 5 and second rectifier circuit 6;

[0060] The capacitor unit 1 includes a first capacitor Cin1 and a second capacitor Cin2 connected in series, the first end of the first capacitor Cin1 is connected to the first end A of the capacitor unit 1, and the first end A of the second capacitor Cin2 is connected. The terminal is connected to the second terminal B of the capacitor unit 1, the second terminal of the first capacitor Cin1...

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PUM

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Abstract

The invention discloses an LLC resonant circuit, a control method and an LLC resonant converter. The LLC resonant circuit comprises a capacitor unit, a first half-bridge circuit, a second half-bridgecircuit, two paths of common-inductance double resonant cavities, a first transformer, a second transformer, a first rectifying circuit and a second rectifying circuit. The primary side capacitor unitis connected with two direct-current capacitors in series. Two half-bridge direct current inputs are constructed. The formed negative feedback plays a role in inhibiting the problem of non-uniform current of the two modules. By combining passive automatic current sharing realized by sharing the same resonant inductor through two resonant cavities, the topology further improves the current sharingeffect in a full-load range, realizes extremely high current sharing degree, and can effectively solve the problem of non-uniform current among modules caused by parameter difference of resonant elements.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an LLC resonant circuit, a control method and an LLC resonant converter. Background technique [0002] A direct current-direct current (DC / DC) converter is a device that converts electrical energy of one voltage value into electrical energy of another voltage value in a DC circuit. New energy storage, DC microgrids, large data centers, electric vehicle charging and LED lighting all place higher and higher requirements on the capacity, efficiency and power density of DC / DC converters. Therefore, the development of high-efficiency, High power density, high reliability DC / DC converters are required for industrial energy saving and applications. The LLC resonant converter is a relatively common DC / DC converter at present. On the one hand, the LLC resonant converter realizes Zero Voltage Switching (ZVS) on the primary side and Zero Current Switching (ZCS) on the secondary ...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33561H02M3/33592H02M1/0074H02M1/009Y02B70/10
Inventor 陈仲伟刘浩田张允伍也凡冷阳朱熹谢欣涛侯益灵
Owner STATE GRID HUNAN ELECTRIC POWER
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