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A Low Current Ripple Coupled Inductor Bidirectional DC Converter

A technology of bidirectional DC conversion and coupled inductance, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, instruments, etc., can solve problems such as voltage level mismatch, reduce current ripple, increase gain, and avoid impact effect

Inactive Publication Date: 2020-12-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims at the problem that the voltage level of the output terminal of the storage battery does not match the voltage level of the DC bus in the hybrid energy source electric vehicle, and needs to be connected through a bidirectional DC converter for energy interaction. The invention proposes a low current ripple coupling inductor bidirectional The DC converter acts as the interface between the battery and the DC bus, see the following description for details:

Method used

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  • A Low Current Ripple Coupled Inductor Bidirectional DC Converter
  • A Low Current Ripple Coupled Inductor Bidirectional DC Converter
  • A Low Current Ripple Coupled Inductor Bidirectional DC Converter

Examples

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Embodiment 1

[0061] A low current ripple coupled inductor bidirectional DC converter, see figure 1 , the low current ripple coupled inductor bidirectional DC converter consists of:

[0062] 1) An inductance L is connected in parallel at the low-voltage interface a1 and capacitance C L , an inductor L is connected in parallel at the high-voltage interface a2 and capacitance C H , inductance L a1 and capacitance C L , and inductance L a2 and capacitance C H Both constitute the LCR structure, that is, the LCR structure is added in both directions.

[0063] 2) On the low voltage side inductance L a1 Connect the equivalent leakage inductance L k One end of the equivalent leakage inductance L k The other end of the parallel connection equivalent excitation inductance L m One end and the primary inductance L 1 At one end, the equivalent magnetizing inductance L m The other end of the, and the primary side inductance L 1 Connect the other end of the capacitor C 3 One end of the capa...

Embodiment 2

[0068] Combine below Figure 1-Figure 7 The scheme in Example 1 is further introduced, see the following description for details:

[0069] (1) Topology

[0070] The embodiment of the present invention proposes as figure 1 The shown low current ripple coupled inductance bidirectional DC converter increases the gain by introducing a coupled inductance during operation, and at the same time increases the LCR structure to reduce the current ripple. figure 2 and image 3 It is the operation schematic diagram of the low current ripple coupled inductance bidirectional DC converter in two modes. Figure 4 and Figure 5 It is an important working waveform of the converter in the two modes of the low current ripple coupled inductor bidirectional DC converter.

[0071] (2) Gain derivation

[0072] In order to facilitate the analysis of the voltage gain and component stress of the converter in Boost mode, the leakage inductance of the coupled inductor and the additional inductance ...

Embodiment 3

[0097] Below to figure 1 low current ripple coupled inductor bidirectional DC converter and figure 2 , image 3 The schematic diagram of the operation of the converter is shown to illustrate the principles and best implementation modes of the embodiments of the present invention. The important waveforms during the operation of the converter are as Figure 4 , Figure 5 shown.

[0098] figure 2 Shown is the switching state of the converter in Boost mode. At this time the power switch Q1 for the main, power switch Q 2-4 acts as a freewheeling diode. Such as figure 2 (a) shows the power switch Q 1 The flow path of the converter current when it is turned on, the low-voltage power supply and the primary side of the coupled inductor L 1 Series via power switch Q 1 Constitute the charging circuit, capacitor C 2 via power switch Q 3 The freewheeling diode and the secondary side of the coupled inductor L 2 Series to capacitor C 3 Discharge, charge current flows throug...

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Abstract

A low current ripple couple inductor bidirectional DC / DC converter is disclosed. The converter comprises: an inductor and a capacitor are connected in parallel at a low-voltage interface; another inductor and another capacitor are connected in parallel at a high-voltage interface; the inductor and the capacitor, as well as the other inductor and the other capacitor, all form an LCR structure, thatis, an LCR structure is added in both directions; The equivalent model of the coupling inductor is composed of a primary inductor, a secondary inductor, an equivalent leakage inductor and an equivalent excitation inductor. The LCR structure is added to reduce the current ripple to realize a boost ratio of 5-10 times. At that same time, the LCR structure is adde to reduce the current ripple. The continuous, low-ripple low-voltage interface current designed by the invention can avoid the impact on the input source, and is very suitable for use at the interface between the battery and the high-voltage bus bar in the composite energy source electric vehicle system.

Description

technical field [0001] The invention relates to the application occasion of a bidirectional DC converter of a composite energy source electric vehicle system, in particular to a novel low current ripple (LCR) coupled inductance bidirectional DC converter, which belongs to the technical field of power electronic power conversion. Background technique [0002] In recent years, with the increasing shortage of non-renewable energy sources, energy issues have attracted more and more attention. At the same time, more and more cars are used by people around the world. At present, most automobiles still use fossil fuels as the main energy source. As the current main energy source, the combustion of fossil energy will bring many environmental problems. In this context, new energy vehicles have become a hot spot in the development of the current automotive industry, among which electric vehicles are an important development direction of new energy vehicles. As the main energy storag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/1582
Inventor 张云刘禾雨张伟
Owner TIANJIN UNIV
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