A bidirectional resonant converter and its control method

A technology of resonant converter and control method, applied in control/regulation system, conversion of DC power input to DC power output, instruments, etc., can solve the problems of reducing transmission efficiency, unable to work at the resonant frequency point, increasing circuit complexity, etc.

Active Publication Date: 2018-08-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

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Problems solved by technology

The problem with this solution is that the series resonant converter cannot work at the resonant frequency point during phase-shift control, which reduces the transmission efficiency; and the output side of the converter adopts synchronous rectification, which increases the complexity of the circuit

Method used

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  • A bidirectional resonant converter and its control method
  • A bidirectional resonant converter and its control method
  • A bidirectional resonant converter and its control method

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Embodiment Construction

[0033] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] as attached figure 2 As shown, the bidirectional resonant converter consists of a primary side full bridge circuit (10), an auxiliary inductance (L a ), a resonant circuit (20), a transformer (T) and a secondary full-bridge circuit (30), wherein the primary full-bridge circuit (10) consists of a first switching tube (S 1 ), the second switching tube (S 2 ), the third switching tube (S 3 ), the fourth switching tube (S 4 ) and the first voltage source (V 1 ), the resonant circuit (20) consists of a resonant inductance (L r ), resonant capacitor (C r ), the transformer (T) consists of a secondary winding (N S ) and a primary winding (N P ), the secondary side full bridge circuit (30) consists of the fifth switching tube (S 5 ), the sixth switching tube (S 6 ), the seventh switching tube (S 7 ), the eighth switching tube (S ...

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Abstract

The invention discloses a bidirectional resonant converter and a control method thereof, which belong to the technical field of power electronic converters. The bidirectional resonant converter is composed of a primary side full-bridge circuit, an auxiliary inductor, a resonant circuit, a transformer and a secondary side full-bridge circuit, wherein the resonant circuit is composed of a resonant inductor and a resonant capacitor. By constructing a fully-symmetrical circuit structure and utilizing the primary side full-bridge circuit and the secondary side full-bridge circuit, the bidirectional resonant converter has a bidirectional power transmission capacity, the duty ratio control and the phase shifting angle control are adopted so that voltage at the two sides and bidirectional currents can be adjusted in a wide range, and the switching process of power transmission directions can be rapid and smooth. According to the bidirectional resonant converter and the control method thereof, the bidirectional resonant converter has the bidirectional power transmission capacity, the control strategy is simple, soft switching of all switching tubes is realized, the switching loss can be effectively reduced, the efficiency can be effectively improved, and the bidirectional resonant converter and the control method thereof are especially suitable to be used in bidirectional isolated DC power conversion occasions such as energy storage systems and electric vehicles.

Description

technical field [0001] The invention relates to a bidirectional resonant converter and a control method thereof, belonging to the technical field of power electronic converters, in particular to the technical field of isolated bidirectional-direct current electric energy conversion. Background technique [0002] In the application of aerospace power system, new energy power generation system, electric vehicle system, uninterruptible power supply system and other technical fields, bidirectional DC converters are required to reduce the volume, weight and cost of the system. In consideration of safety, a transformer is usually used to electrically isolate the primary and secondary sides of the converter. How to improve the power transmission efficiency of the bidirectional converter, find a control method with superior performance, and realize the smooth switching of the power transmission direction have always been the key issues in this technical field. [0003] Traditional ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 吴红飞李玥玮邢岩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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