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Full-bridge llc resonant converter and its resonant current detection method

A resonant converter and resonant circuit technology, which is applied in the direction of converting DC power input to DC power output, converting AC power input to DC power output, and only measuring current, can solve the problem of high cost of current transformers and improve the efficiency of full-bridge LLC. The overall cost of the resonant converter, etc.

Active Publication Date: 2022-06-03
HANGZHOU ZHONGHEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The LLC resonant converter can be divided into full-bridge type and half-bridge type according to the rectification method. For the full-bridge type LLC resonant converter, most of them use circuit transformers to detect the resonant current, but due to the high cost of current transformers , thus increasing the overall cost of the full-bridge LLC resonant converter

Method used

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  • Full-bridge llc resonant converter and its resonant current detection method
  • Full-bridge llc resonant converter and its resonant current detection method

Examples

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Embodiment 1

[0026] This embodiment provides a full-bridge LLC resonant converter, which aims to solve the problem of high overall cost caused by using a current transformer to sample the resonant current in the existing full-bridge LLC resonant converter.

[0027] Specifically, refer to figure 1 As shown, the full-bridge LLC resonant converter includes: a full-bridge rectifier circuit 10 , a resonant circuit 20 , a detection circuit 30 and a secondary circuit 40 .

[0028] The full-bridge rectifier circuit 10 includes two first bridge arms and two second bridge arms, both of which are used for rectification. The resonance circuit 20 has an access point A1 and an access point A2. One of the first bridge arms is connected between the access point A1 and the forward end of the DC source, the other first bridge arm is connected between the access point A2 and the reverse end of the DC source, and one of the second bridge arms Connected between the access point A1 and the reverse end of the ...

Embodiment 2

[0052] This embodiment provides a method for detecting resonant current, which is applied to the full-bridge LLC resonant converter shown in the first embodiment. figure 1 and figure 2 As shown, the resonant current detection method includes step S10 and step S20.

[0053] In step S10, the voltage value of the first resistor R1 is obtained and recorded as V1. The acquisition method is not limited here, and can refer to the method correspondingly used by the existing current transformer when performing the resonant current detection.

[0054] Step S20, set the voltage value V 1 Enter the first formula to get the resonant current, where the first formula is: Ir=(2*C 5 ) / (R 1 *C 1 )*V 1 , where Ir is the resonant current flowing through the resonant circuit 20, C 5 is the capacitance value of the resonant capacitor C5, R 1 is the resistance value of the first resistor R1, C 1 is the capacitance value of the first capacitor C1. For this step, reference may be made to th...

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Abstract

The invention discloses a full-bridge LLC resonant converter, which relates to the technical field of power electronics, and includes a full-bridge rectifier circuit, a resonant circuit, a detection circuit and a secondary circuit; the resonant circuit includes a first inductance, a second inductance, and a resonant capacitor As well as the transformer group, the resonant capacitor has a first end and a second end, the potential values ​​of the first end and the second end are the same and opposite in direction; the detection circuit includes a first resistor and a first capacitor, the first resistor and the first capacitor are connected in series, and the second One end of a capacitor far away from the first resistor is connected to any end of the resonant capacitor, the end of the first resistor far away from the first capacitor is grounded, and the ratio of the voltage across the first capacitor to the voltage across the first resistor is greater than 50, making the resonance current The value is linearly related to the voltage across the first resistor. The invention detects the resonant current by replacing the current transformer with the first resistor and the first capacitor to reduce the overall cost. The invention also discloses a method for detecting the resonant current.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a full-bridge LLC resonant converter and a resonant current detection method thereof. Background technique [0002] LLC resonant converter is one of the main power stage topologies of led tv, which has many advantages over other converters, such as: a) it works under zvs (zero voltage switching) conditions over the entire load range, In order to achieve high efficiency; b) The operating frequency range is relatively narrow, which is convenient for the design of high-frequency transformers and input filters; c) The voltage stress of the switch used on the primary side is clamped on the input voltage, while the two diodes on the secondary side is always equal to twice the output voltage of the center-tapped transformer. [0003] The LLC resonant converter can be divided into full-bridge type and half-bridge type according to the rectification method. For the full-bridge ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/219H02M7/162H02H7/12G01R19/00H02M1/00
CPCH02M3/3353H02H7/1213G01R19/0092H02M1/0009Y02B70/10
Inventor 李锐程志杰王金鑫许双全卢继东刘宏森
Owner HANGZHOU ZHONGHEN ELECTRIC CO LTD
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