Full-wave active rectification LLC resonant converter and control policy thereof

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 problems such as bias magnetism, complex transformer technology, and reduced core utilization.

Inactive Publication Date: 2019-02-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Abstract
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Problems solved by technology

However, when working in power-down hold, the transformer works in an asymmetric state, and there is a magnetic bias, and the introduction of

Method used

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  • Full-wave active rectification LLC resonant converter and control policy thereof
  • Full-wave active rectification LLC resonant converter and control policy thereof
  • Full-wave active rectification LLC resonant converter and control policy thereof

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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 Shown, described a kind of full-wave active rectification type LLC resonant converter is by input source (U in ), input bus capacitance (C in ), primary switching network (10), resonant inductor (L r ), resonant capacitor (C r ), transformer (T), n (≥ 1) secondary full-wave active rectification switch network (20, k (k = 1 ~ n)), m (≥ 0) secondary full-wave rectification switch network (30 , k (k=n+1~n+m)), output filter capacitor (C o ) and the output load (R o ) form, where the transformer (T k , k=1~n+m) The value of the primary magnetizing inductance is L m ; The input two ends of the primary side switch network (10) are respectively connected with the input source (U in ) are connected to both ends, the output terminal a of the primary switching network (10) is connected to the resonant inductor (L r ) co...

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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 LLC resonant converter and its control strategy, which belongs to the technical field of power electronic converters, especially the isolated DC-DC electric energy conversion technical field. 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 requirement, but...

Claims

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Application Information

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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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