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Full-bridge LLC resonant converter and resonant current detection method thereof

A resonant converter and resonant circuit technology, applied in the direction of converting DC power input to DC power output, measuring only current, measuring current/voltage, etc., can solve the problem of increasing the overall cost of full-bridge LLC resonant converter and the cost of current transformers higher question

Active Publication Date: 2020-12-25
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 resonant current detection method thereof
  • Full-bridge LLC resonant converter and resonant current detection method thereof

Examples

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Embodiment 1

[0026] This embodiment provides a full-bridge LLC resonant converter, aiming to solve the problem that the current full-bridge LLC resonant converter uses a current transformer to sample the resonant current, resulting in high overall cost.

[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] Wherein, 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 positive 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 ...

Embodiment 2

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

[0053] Step S10, acquiring the voltage value of the first resistor R1 and denoting it as V1. The acquisition method is not limited here, and it can refer to the corresponding method used by the existing current transformer when detecting the resonant current.

[0054] Step S20, 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 the related de...

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Abstract

The invention discloses a full-bridge LLC resonant converter, which relates to the technical field of power electronics and comprises a full-bridge rectifier circuit, a resonant circuit, a detection circuit and a secondary circuit, the resonance circuit comprises a first inductor, a second inductor, a resonance capacitor and a transformer bank, the resonance capacitor is provided with a first endand a second end, and the first end and the second end have the same potential value and opposite directions; the detection circuit comprises a first resistor and a first capacitor which are connectedin series, the end, away from the first resistor, of the first capacitor is connected to any end of the resonant capacitor, the end, away from the first capacitor, of the first resistor is grounded,and the ratio of voltage values at the two ends of the first capacitor to voltage values at the two ends of the first resistor is larger than 50. The resonance current value and the voltage values atthe two ends of the first resistor are in linear relation. According to the invention, the first resistor and the first capacitor are used for replacing a current transformer to carry out resonance current detection so as to reduce the overall cost, and the invention also discloses a resonance current detection method.

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, and it has more advantages than other converters, for example: a) It works under the condition of ZVS (zero voltage switching, zero voltage switching) in the whole 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 to the input voltage, while the two diodes on the secondary side The voltage 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 th...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02H7/12G01R19/00H02M1/00
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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