A soft-switching bidirectional dc/dc conversion circuit and converter

A conversion circuit and soft switching technology, applied in the field of converters, can solve the problems of increased conduction loss, complex circuit, and less than ideal effect.

Active Publication Date: 2020-07-07
SHENZHEN SINEXCEL ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using a resonant network (such as LLC, LCC, CLLC, LCL) to achieve soft switching can achieve high efficiency in a certain operating range or frequency range, but the effect is not ideal for wide-range applications
However, using an active c...

Method used

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  • A soft-switching bidirectional dc/dc conversion circuit and converter
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  • A soft-switching bidirectional dc/dc conversion circuit and converter

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Embodiment Construction

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Typical embodiments of the invention are shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0036] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intervening elements at the same time. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodim...

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Abstract

A soft-switching bidirectional DC/DC conversion circuit and converter, including k parallel-connected buck-boost circuits, the two bridge arm switches in each buck-boost circuit are switched in turn to enter the conduction state, and during the switching process there is In the dead zone, the driving waveforms of k buck-boost circuits are interleaved in time by 1/(k f s ), f s Represents the switching frequency of the buck-boost circuit, where the switching frequency f s According to real-time changes in real-time input voltage, real-time output voltage and real-time output power, the f s Make the circuit work in intermittent working mode, and the energy stored in the energy storage inductor can complete the charge and discharge of the parasitic capacitance in each bridge arm switch within the dead time, and maintain the diode during the freewheeling process in the dead time energy consumption. The invention has low conduction loss and switching loss, high efficiency, and can maintain high-efficiency operation in a wide range; material cost is reduced; current ripple is superimposed, and the ripple frequency is doubled while the peak and valley cancel each other, effectively reducing the high-voltage and low-voltage sides Filter volume; unitized design for easy expansion.

Description

technical field [0001] The invention relates to the field of converters, in particular to a soft-switching bidirectional DC / DC converter. Background technique [0002] As the energy transmission link between high-voltage DC unit (DC busbar or high-voltage battery, etc.) , data centers, electric vehicles, aerospace, uninterruptible power supplies, etc. Generally, the current stress on the low-voltage side of the DC / DC converter is relatively large, and the voltage stress on the high-voltage side is relatively high. The Buck / Boost circuit in the traditional hard switching mode has serious switching loss (large current and high voltage during the switching process), reverse recovery is also very serious, and it is difficult to improve efficiency and frequency; at the same time, the size of the radiator and passive components often Larger, low power density; in addition, the voltage conversion rate and current change rate are large during the hard switching process, and the EM...

Claims

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Application Information

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IPC IPC(8): H02M3/158H02M1/088
CPCH02M1/088H02M3/1584H02M1/0058H02M3/1586Y02B70/10
Inventor 滕辉范小波任远航
Owner SHENZHEN SINEXCEL ELECTRIC
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