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High-gain and wide-duty cycle control Boost converter

A converter and duty ratio technology, applied in the field of power electronic converters, can solve the problems of narrow application range and increased circuit control cost, etc., achieve flexible voltage gain adjustment, improve efficiency, and achieve simple effects

Active Publication Date: 2018-10-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the duty cycle can only work in the range of d≥0.5, if an independent start-up control circuit is used, the cost of circuit control is increased, and the application range is narrow

Method used

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  • High-gain and wide-duty cycle control Boost converter
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  • High-gain and wide-duty cycle control Boost converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as figure 1 As shown, a high gain, wide duty cycle control Boost converter of this embodiment, the power supply V in The positive poles of the coupled inductors T 1 The primary winding inductance L 1a Terminal of the same name, coupled inductor T 2 The primary winding inductance L 2a terminal connection of the same name, the coupled inductor T 1 The primary winding inductance L 1a The non-identical ends of the switches are respectively connected with the switch tube S 1 Drain, diode D 1 The anode connection of the switching tube S 1 source and supply V in The cathode connection of the diode D 1 The cathode and capacitance C 1 、C 3 one end of the diode D 3 the anode connection, the capacitor C 1 The other end of the power supply V in The negative connection of the capacitor C 3 The other end of the coupled inductor T 1 The secondary winding inductance L 1b Connected to the dotted end, the coupled inductor T 1 The secondary winding inductance L 1b ...

Embodiment 2

[0057] Embodiment 2 Equivalent circuit structure

[0058] A high-gain, wide-duty ratio control Boost converter of this embodiment has the same structure as that of Embodiment 1, and its equivalent circuit structure is as follows figure 2 shown.

[0059] figure 2 A kind of high gain, the equivalent structure of wide duty cycle control Boost converter proposed for the present embodiment; Total T in this structure 1 , T 2 Two coupled inductors, combined with figure 1 , each coupled inductor has two windings, and the coupled inductor T 1 and T 2 The end of the same name is represented by "*". Among them, L 1a , L 2a are coupled inductance T 1 , T 2 Primary winding inductance, L 1b , L 2b are coupled inductance T 1 , T 2 Secondary winding inductance, L 1a , L 2a The number of turns are N P1 , N P2 , L 1b , L 2b The number of turns are N s1 , N s2 , coupled inductance T 1 , T 2 The turns ratio is n 1 =N p1 / N s1 , n 2 =N p2 / N s2 . combine figure 2...

Embodiment 3

[0060] Working principle of embodiment 3 (d≥0.5)

[0061] A kind of high gain, wide duty ratio control Boost converter in the present embodiment, switching tube S 1 and switch tube S 2 The input signal duty ratio of the gate is d≥0.5, and the main working waveform of the converter in this embodiment when d≥0.5 is as follows image 3 As shown, there are 9 working modes in one switching cycle, such as Figure 4-12 shown.

[0062] Modal 1[t 0 -t 1 ]

[0063] at t 0 moment, the switching tube S 1 start conduction, S 2 To maintain conduction, the diode D 1 、D 2 、D 5 and D 6 off, D 3 and D 4 conduction. The corresponding equivalent circuit is as Figure 4 shown, the coupled inductor T 1 The magnetizing inductance L m1 and leakage inductance L k1 In the charging state, the leakage inductance current i Lk1 Gradually increases, the power supply through the secondary winding N of the coupled inductor s1 To the doubler capacitor C 3 Charge. Coupled inductance T 2 ...

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Abstract

The invention discloses a high-gain and wide-duty cycle control Boost converter and belongs to the technical field of converters. The high-gain and wide-duty cycle control Boost converter disclosed bythe invention is characterized in that a clamping absorption unit 1 is composed of a clamping diode D1 and a clamping capacitor C1; a clamping absorption unit 2 is composed of a clamping diode D2 anda clamping capacitor C2; a pressure doubling unit 1 is composed of a capacitor C3, a diode D3 and a secondary winding L1b of a coupling inductor T1; a pressure doubling unit 2 is composed of a capacitor C4, a diode D6 and a secondary winding L2b of a coupling inductor T2. The high-gain and wide-duty cycle control Boost converter disclosed by the invention has the benefits that on the basis of thebasic Boost converter, the coupling inductor T1, the pressure doubling unit 1, the coupling inductor T2 and the pressure doubling unit 2 are respectively added to obtain two different forms of Boostconverters; the input sides of the two different forms of Boost converters are connected in parallel, and the output sides are connected in a manner of series connection of the capacitors, so that theconverter has higher boosting capacity; the voltage stresses of a switching tube and the diodes are reduced, and the voltage gain can be adjusted within a duty cycle range that d is less than o but more than 1.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a high-gain, wide duty ratio control Boost converter. Background technique [0002] In applications such as uninterruptible power supplies and new energy power generation, high-gain DC / DC converters have been widely used. Based on the traditional two-phase interleaved parallel Boost converter, a new non-isolated high-gain DC / DC converter is proposed. The proposed converter has the characteristics of low input current ripple, automatic two-phase inductor current sharing, low switch and diode voltage stress, and high boost capability, and is suitable for applications with a large input-to-output voltage ratio and no electrical isolation. [0003] In the prior art, the interleaved parallel DC / DC converter implemented by coupled inductors can achieve high voltage gain, and also has the characteristics of low input current ripple, low switching device voltage stre...

Claims

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Application Information

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IPC IPC(8): H02M3/07
CPCH02M3/07
Inventor 胡雪峰梁文娟马鹏辉章家岩
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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