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A light-load control method for energy feedback of a buck-boost LLC two-stage converter

A technology of energy feedback and control method, applied in the direction of adjusting electrical variables, control/regulating systems, converting DC power input to DC power output, etc., can solve problems such as large output ripple, increase false load, reduce converter efficiency, etc. Achieve small output ripple, improve voltage regulation capability, and improve the effect of high output voltage

Active Publication Date: 2021-10-15
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, putting the circuit into burst mode will cause a large output voltage ripple, and adding a preload will reduce the efficiency of the converter by dissipating energy
However, the research on energy feedback control is currently limited to LLC circuits. Directly applying the energy feedback control method to the Buck-Boost LLC cascaded topology has problems such as excess energy in the bus capacitor, excessive stress on the power tube, and large output ripple.

Method used

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  • A light-load control method for energy feedback of a buck-boost LLC two-stage converter
  • A light-load control method for energy feedback of a buck-boost LLC two-stage converter
  • A light-load control method for energy feedback of a buck-boost LLC two-stage converter

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Embodiment Construction

[0023] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The energy feedback control principle of the Buck-Boost LLC two-stage converter disclosed in this application is as follows: figure 1 The shown Buck-Boost LLC two-stage converter includes: a first switching tube S 1 , the second switch tube S 2 , the third switch tube S 3 , the fourth switch tube S 4 , pre-stage inductance L b The four-switch tube pre-stage Buck-Boost converter, and the excitation inductance L m , Resonant inductance L r , Resonant capacitance C r , transformer, first rectifier tube SR 1 , the second rectifier tube SR 2 , output capacitance C O The post-stage LLC converter composed of the first switching tube S 1 with the second switch S 2 connected in series to form the first bridge arm, and the third switching tube S 3 with the fourth switch S 4 The second bridge arm is formed in series, and the pre-stage induc...

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Abstract

The invention discloses a light-load control method for energy feedback of a Buck-Boost LLC two-stage converter, and belongs to the technical field of power generation, power transformation or power distribution. In each light-load working cycle, the microcontroller configures the timer to enter the energy feedback control mode, and generates a set of switching signals of the primary and secondary sides with a phase difference, and then drives the switching tubes of the primary side and the switching tubes of the secondary side respectively. The rectifier tube reverses the terminal voltage on the secondary side, and realizes that the energy of the load passes through the resonant circuit and then transfers back to the source, thereby reducing the output voltage. After entering the energy feedback control mode, part of the energy will be fed back to the primary side every cycle. By adding phase adjustment, the invention solves the problem of excess output energy under the light load state, ensures the stability of the output voltage, and improves the voltage regulation capability of the two-stage converter under the light load state.

Description

technical field [0001] The invention relates to a Buck-Boost LLC converter, in particular to a light-load control method for energy feedback of a Buck-Boost LLC two-stage converter, and belongs to the technical field of power generation, power transformation or power distribution. Background technique [0002] The LLC resonant converter can realize the zero-voltage turn-on of the switch tube and the zero-current turn-off of the rectifier tube on the secondary side in the full load range, and has the characteristics of high efficiency, but the LLC resonant converter has weak voltage regulation ability and often uses pulse frequency modulation Stable output voltage, which is not conducive to the design of magnetic components and electromagnetic interference. The Buck-Boost LLC two-stage converter can be improved by pre-stage voltage regulation, and the superposition of the current of the pre-stage and post-stage during the dead time can enhance the soft switching capability of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/08
CPCH02M1/08H02M3/33584
Inventor 钱钦松郑德军刘琦杨兰兰孙伟锋时龙兴
Owner SOUTHEAST UNIV
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