SK289058B6 - High gain boost converter with the coupled inductors and the resetting of the magnetic flux - Google Patents

Abstract

The high gain boost converter with the coupled inductors and the resetting of the magnetic flux, consists of the DC source (1) and the boost converter (2). The latter consists of the power switches (3), the coupled boost inductors (4), coupled desaturating block (5) and the output part (7) comprising the output condenser with the load and the control circuit (8). The connection is characterized by the converter that obtains a high constant gain due to reciprocal magnetic coupling between the inductors. The desaturating inductor ensures resetting of a magnetic flux of the coupled inductors hence it prevents the magnetic circuit of oversaturation and this energy is moved via desaturating rectifier to the load, so that the efficiency of the connection is higher.

Description

The field of technology

The subject of the invention is an interlaced step-up converter with high gain, coupled inductances and magnetic flux reset designed for source applications. The invention belongs to the field of power electronics.

Current state of the art

Increasing efficiency, power density and other parameters is the current trend in power electronics. Step-up converters are used wherever it is necessary to increase the voltage level of the power source, but recently especially in converters for cars, where they increase the voltage from the batteries to power the electric motor. And it is precisely in electric cars that a high profit is required.

In the field of step-up converters, interleaved converters are increasingly being used (Yie-Tone Chen, Zong-Xing Lu, Ruey-Hsun Liang: Analysis and Design cf a Novel High-Step-Up DC/DC Converter with Coupled Inductors, In: IEEE Transactions on Power Electronics, 2017, DOI 10.1109/TPEL.2017.2668445; He Liu, and Donglai Zhang: Two-Phase Interleaved Inverse-Coupled Inductor Boost without Right Haif Piane Zeros, In: IEEE Transactions on Power Electronics, 2016, DOI 10.1109/TPEL. 2016.2565723; Xiucheng Huang, Fred C. Lee, Qiang Li, Weijing Du: High Frequency High Efficiency GaN-Based Interleaved CRMBi-directional Buck/Boost Converter with Inverse Coupled Inductor, In: IEEE Transactions on Power Electronics, 2015, DOI 10.1109/TPEL .2015.2476482; K. C. Tseng, J. Z. Chen, J. T. Lin, C. C. Huang, and T. H. Yen: High Step-up Interleaved Forward-Flyback Boost Converter with Three-Winding Coupled Inductors, In: IEEE Transactions on Power Electronics, 2014, DOI 10.1109/TPEL .2014.2364292), fig. 3, as they have more favorable parameters (smaller current and voltage ripple, efficiency, higher dynamics, shading - disconnection of unused branches, reduction of electromagnetic interference, n-fold frequency of the output current ripple, etc.) compared to classic step-up converters (Sam Abdel-Rahman, Franz Stückler, Ken Siu: PFC boost converter design guide - 1200 W design example, Application Note; Abdul Fathah: Design cf a Boost Converter, Bachelor thesis, 2013; B. M Hasaneen, Adel A. Elbaset: Design And Simulation cf DC/ DC Boost Converter, In: The Twelfth International Middle East Power System Conference, MEPCON'2008, South Valley University, Faculty of Eng., Aswan, Egypt, Vol. I, March 13-15, 2008), fig. 2. An advantageous feature of interleaved step-up converters is the possibility of magnetically binding these inductances, which further improves their properties and increases their possibilities (possibility of soft switching of power switches, etc.). The magnetic coupling in these converters ensures a smaller ripple of the current taken, and thus reduces the requirements for the size of the input capacity. Some such inverters also allow bidirectional operation (in one direction they are increasing, in the other direction they are decreasing). However, with the increasing number of branches of the converter, the demands on its management increase, which can be realized in different ways (complementary switching, with overlap, etc.).

The essence of the invention

The interlaced boost converter with high gain, coupled inductances and magnetic flux reset consists of three parts. The first part of the system consists of an interleaved step-up converter with a constant high gain, which increases the input voltage to the desired output value. The second part of the system consists of a desaturation block, whose task is to desaturate (prevent oversaturation) the magnetic circuit due to mutual magnetic coupling with other inductances, and in addition, this energy is transferred to the load through the desaturation rectifier, which increases the efficiency of the entire connection. The last part of the system consists of a control circuit that controls the switching of the transistors of the step-up converter so that the required voltage value is reached at the output.

The interleaved step-up converter with high gain, coupled inductances and magnetic flux reset achieves high constant gain and also high efficiency precisely because of the strong mutual magnetic coupling between individual inductances, where all inductances are installed on the central post of a single magnetic circuit. Tertiary (desaturation) inductance ensures the resetting of the magnetic flux of the coupled inductance, and therefore prevents the oversaturation of the magnetic circuit, and in addition, this energy is transferred to the load through the desaturation rectifier, which increases the efficiency of the entire connection. The technical solution achieves high efficiency and high constant gain compared to a classic step-up converter. The use of the tertiary (desaturation) inductance ensures the resetting of the magnetic flux of the coupled inductance, and thus prevents the oversaturation of the magnetic circuit, and in addition, this energy is transferred to the load through the desaturation rectifier. The mentioned connection has all the properties of classic step-up converters, but compared to the original step-up converters, it brings other advantageous properties, namely small current and voltage ripple, high dynamics, EMI reduction and shielding, i.e. disconnection of unused branches.

Overview of images on drawings

In fig. 1 shows a schematic of an interlaced boost converter with high gain, coupled inductances and magnetic flux reset.

In fig. 2 shows a diagram of a classic boost converter and in fig. 3 shows a diagram of a classic interlaced boost converter. Figures 2 and 3 complete the description of the current state of the art.

Examples of implementation of the invention

Interleaved boost converter with high gain, coupled inductances and magnetic flux reset according to fig. 1 consists of a DC source 1, to which is connected an interleaved boost converter 2 formed by series connection of coupled boost inductances 4 and power switches 3. The output from the interleaved boost converter 2 is fed to a coupled desaturation block 5 formed by a coupled desaturation winding 6 and a desaturation rectifier, which is connected to the output part 7 formed by the output capacitor and the load. Control of the switching of the power switches 3 is provided by the control circuit 8. The coupled boosting inductance 4 of the interlaced step-up converter 2 and the coupled desaturation winding 6 of the coupled desaturation block 5 are installed on the central column of a single magnetic circuit.

Industrial applicability

The interleaved step-up converter with high gain, coupled inductances and magnetic flux reset can be used in all applications requiring DC voltage boosting (drives, electric cars, backup sources, telecommunications, in converters for renewable energy sources, conventional power supplies, etc.).

List of relationship tags

-One-way source

- Interleaved boost converter

3 - Power switches

-Bonded boosting inductances

-Tethered desaturation block

-Bonded desaturation winding

- The output part formed by the output capacitor and the load

8 - Control circuit

Ti, T ₂ - Control electrodes

Claims (2)

PATENT CLAIMS 1. Interleaved boost converter with high gain, coupled inductances and magnetic flux reset, consisting of a DC source (1), an interleaved boost converter (2), a coupled 5 desaturation block (5), an output part (7) and a control circuit (8), characterized in that an interlaced boost converter (2) consisting of power switches (3) and coupled boost inductances (4) is connected to the DC power source (1), the output from the interlaced boost converter (2) is connected to a coupled desaturation block (5) ) formed by a coupled desaturation winding (6) and a desaturation rectifier, the output of which is connected to the output part (7) formed by the output capacitor and 10 load, while the control circuit (8) is connected to the control electrodes (Ti, T ₂ ) of the power switches (3) ). 2. Interleaved boost converter with high gain, coupled inductances and magnetic flux reset according to claim 1, characterized in that the coupled boost inductances (4) of the interleaved boost converter (2) and the coupled desaturation winding (6) of the coupled desaturation block (5) are installed on the central post of a single magnetic circuit.