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A full-wave active rectification type llc resonant converter and its control strategy

A resonant converter and control strategy technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve the problems of reducing the utilization rate of magnetic cores, inconvenient processing, complex transformer technology, etc.

Inactive Publication Date: 2021-01-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the power-down is maintained, the transformer works in an asymmetric state, and there is a bias magnetic field, and the introduction of the auxiliary winding makes the transformer process complicated, not easy to process, and reduces the utilization rate of the magnetic core.

Method used

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  • A full-wave active rectification type llc resonant converter and its control strategy
  • A full-wave active rectification type llc resonant converter and its control strategy
  • A full-wave active rectification type llc resonant converter and its control strategy

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Embodiment Construction

[0055] The technical solution of the present invention will be described in detail in conjunction with the accompanying drawings.

[0056] as attached Figure 4 As shown, the full-wave active rectification LLC resonant converter consists of an input source U in , Input bus capacitance C in , primary switch network, resonant inductor L r , Resonant capacitance C r , n+m transformers, n secondary full-wave active rectification switch networks, m secondary full-wave rectifier switch networks, output filter capacitor C o and output load R o constitute, where n≥1, m≥0, transformer T k The magnetizing inductance value of the primary side is L m，k , where 1≤k≤n+m; the two ends of the input of the primary switch network are respectively connected to the input source U in The two ends of the switch network are connected, and the output terminal a of the primary switching network is connected to the resonant inductor L r Connected to one end, the resonant inductance L r The oth...

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Abstract

The present invention discloses a full-wave active rectification LLC resonant converter and a control policy thereof, belonging to the technical field of power electronic converters. The input source,an input bus capacitor, a primary side switching network, a resonance inductor, a resonance capacitor, a transformer, n (>=1) secondary side full-wave active rectification switching networks, m (>=0)secondary side full-wave rectification switching networks, an output filtering capacitor and an output load; when an input voltage is close to a rated working point, a secondary side assistant activeswitch tube maintains closure, and a convertor employs frequency conversion control; when an input voltage drops, the duty ratio of the secondary side assistant active switch is regulated to maintainthe stable output voltage; and the full-wave active rectification LLC resonant converter can meet two demands of the power system for the steady-state working point efficiency and the transient voltage drop, and is specially suitable for application occasions where the power system is required to have a power-down maintenance capacity such as a server power source and a rail traffic power source.

Description

technical field [0001] The invention relates to a full-wave active rectification type LLC resonant converter and a control strategy thereof, belonging to the technical field of power electronic converters, in particular to the technical field of isolated DC-DC power conversion. Background technique [0002] With the development of information technology, isolated DC power supply modules are used for power supply in many applications, and the demand for them is increasing and the requirements are getting higher and higher. Especially in servers, rail transit and other occasions, DC power modules are required to have high efficiency and small size. At the same time, when the input voltage drops, the output voltage must be stable for a certain period of time to ensure that the system can save key data and switch to the backup power supply. and so on. In order to achieve this goal, the size of the input bus capacitor is usually increased to ensure the power-down time requiremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592Y02B70/10
Inventor 汤欣喜吴红飞邢岩罗有纲
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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