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LLC resonant converter

A technology of resonant converters and transformers, which is applied in the direction of instruments, converting DC power input to DC power output, and adjusting electrical variables. It can solve the problems of small signals being too large, and achieve the effects of improving small signals and improving dynamic response.

Pending Publication Date: 2021-12-07
SHANGHAI JUNTAO POWER EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides an LLC resonant converter to solve the problem that the power level of the existing LLC resonant converter is too large in the full working range, and enhance the ability of LLC resonant conversion to suppress load disturbance and suppress input disturbance

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0025] In the description of the present application, it should be understood that the terms "first" and "second" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, unless otherwise specified,...

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Abstract

The invention discloses an LLC resonant converter which comprises a voltage loop main loop and a current loop auxiliary loop connected in series in the voltage loop main loop. The voltage loop main loop comprises a switch tube, a switch tube, a resonant inductor, a transformer, a resonant capacitor, a diode D201, a diode D202, an output capacitor, an output resistor, a resistor R201, a resistor R203, a capacitor C203, a capacitor C202, a capacitor C204, a resistor R204, an operational amplifier U1, a resistor R202, a resistor R216, a photoelectric coupler, a resistor R101, a resistor R102, a resistor R103, a capacitor C101 and a resonant controller. The invention provides an LLC resonant converter, which can effectively improve the problem that the power level of a series LLC resonant converter is too large in small signal in a right working range, and enhance the load disturbance suppression and input disturbance suppression capabilities of the LLC resonant converter.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an LLC resonant converter. Background technique [0002] In switching power supply applications, the LLC resonant converter has become a DC-DC topology that has attracted much attention in the past decade due to its excellent soft switching, EMI, high efficiency, and high power density, and is widely used in consumer electronics. , industry, communication and other fields. Like the PWM converter, the LLC resonant converter is a highly nonlinear system with multiple input variables, and it is disturbed by load and input during operation. The small-signal characteristics of the power stage of the existing LLC resonant converter will change greatly in the whole working range (different input voltage and different load conditions), which brings troubles to the design of the compensation network. Single closed-loop control makes it difficult for the series LLC resonant con...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/48
CPCH02M3/33592H02M7/48Y02B70/10
Inventor 杨欣高云峰陈航
Owner SHANGHAI JUNTAO POWER EQUIP CO LTD