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A digital soft-start method for a full-bridge llc converter

A soft-start, converter technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problem of inability to effectively limit inrush current, and achieve the purpose of reducing inrush current and voltage stress, and reducing inrush current. Effect

Inactive Publication Date: 2018-03-06
GUANGDONG UNIV OF TECH
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Problems solved by technology

At the same time, using this soft start method cannot effectively limit the inrush current within a certain range

Method used

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  • A digital soft-start method for a full-bridge llc converter
  • A digital soft-start method for a full-bridge llc converter
  • A digital soft-start method for a full-bridge llc converter

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Embodiment

[0031] Such as figure 1 , figure 2 As shown, the present invention is a digital soft-start method for a full-bridge LLC converter, which is divided into three steps.

[0032] First, set the upper limit of the resonant inductor current I for initial soft start rh (attached figure 2shown in ①) and the lower limit-I rl (attached figure 2 shown in ②). When the bus voltage V in For the rated range, applying a drive pulse requires I rh rl . Then according to the design parameters of the circuit, the switching time of each switching tube is accurately calculated by solving the differential equation. The formula is given as follows:

[0033] Q 1 , Q 2 , Q 3 , Q 4 Opening time calculation formula (Q 1 , Q 4 Simultaneously turn on and turn off; Q 2 , Q 3 Simultaneous turn-on and turn-off):

[0034]

[0035]

[0036] Among them, U cr , I Lr for each cycle Q 1 , Q 4 tube open or Q 2 , Q 3 Calculate the initial value of the tube turn-on start state, V in i...

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Abstract

The invention discloses a digital soft start method for a full-bridge LLC converter, comprising the following steps: S1, setting the upper limit Irh and the lower limit -Irl of the resonant inductor current for the initial soft start, and accurately limiting the surge current at start-up to Within the stable working range of the circuit; S2, according to the design parameters of the circuit, accurately calculate the switching time of each switching tube by solving the differential equation; S3, keep the switching frequency of f1 unchanged until the output voltage is at this switching frequency The stable value Vo1 that can be reached; S4, the switching frequency from f1 is continuously reduced within a fixed time interval until the output voltage reaches the rated output voltage Vo, or when f1 is less than the resonant frequency fr, the soft start ends. The invention optimizes the design of the soft start process, sets the upper limit and lower limit of the resonance network current according to the design parameters of the circuit, accurately calculates the switching time of each switching tube through the differential equation, and then uses the method of digital control look-up table to strictly control the entire Soft start process.

Description

technical field [0001] The invention relates to the research field of electronic power and electric drive, in particular to a digital soft start method for a full-bridge LLC converter. Background technique [0002] With the rapid development of power electronics technology, more high frequency, high efficiency, high power density and low noise requirements are put forward for switching power supply. At present, the relatively mature soft switching technology, such as phase-shifted full bridge, is difficult to achieve a truly ideal soft switching (including the main switching tube and the secondary rectifying diode), and as the switching frequency increases, its loss continues to increase , so seeking a more efficient, high switching frequency and high power density topology has become the focus of current research. LLC resonant full-bridge converter, as one of the more outstanding performances in the full-bridge topology, has the following advantages: the primary MOSFET ZVS...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36
CPCH02M1/36H02M1/0012
Inventor 李志忠兰尚荣李学易李优新刘东峰程昱黄国宏
Owner GUANGDONG UNIV OF TECH
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