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Tap coupling inductance type non-isolated DC boost converter and modulation method thereof

A coupled inductance, DC boost technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of weak boost capability of classic Boost topology and large voltage stress of switching tube.

Inactive Publication Date: 2019-01-29
CHINA ELECTRIC POWER RES INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Restricted by its working principle, the boost capability of the classic Boost topology is weak, and the voltage stress of the switch tube is relatively large, so it is not suitable for applications in:

Method used

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  • Tap coupling inductance type non-isolated DC boost converter and modulation method thereof
  • Tap coupling inductance type non-isolated DC boost converter and modulation method thereof
  • Tap coupling inductance type non-isolated DC boost converter and modulation method thereof

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Embodiment 1

[0093] In the present invention, such as figure 1 The new circuit topology shown realizes non-isolated high ratio DC-DC boost conversion. The circuit topology is simple and clear, including: 1 coupled inductor (double winding) with a center tap; 2 fully controlled power electronic switching devices S 1 and S 2 (IGBT or MOSFET devices can be selected according to the voltage and power level in practical applications); 4 power diodes D 1 、D 2 、D 3 and D 4 ; 2 capacitors C 1 and C 2 ;

[0094] One end of the coupled inductor with a center tap is connected to the positive pole of the power supply input end, and the other end is connected to the anode of the fourth diode; the cathode of the fourth diode is respectively connected to the cathode of the third diode and the first diode. The anode of a diode is connected; the anode of the third diode is connected to the middle tap of the coupled inductor; the cathode of the first diode is connected to the positive pole of the po...

Embodiment 2

[0165] The simulation under MATLAB-SIMULINK is used as a verification case, such as figure 1 As shown, take the main circuit parameter C 1 =C 2 = 100μF, L 1s = L 2s =1.01mH L 1-2M =1mH, turns ratio N=1, where L 1s and L 2s Inductance L 1 and L 2 self-inductance, L 1-2M is the inductance L 1 with L 2 mutual inductance. In this example, under the condition of N=1, satisfy L 1s = L 2s ≈L 1-2M , which can be considered as an approximate ideal coupling situation.

[0166]The input DC voltage is U in =800V, conduct open-loop simulation test in two modes of non-over-conduction modulation and over-conduction modulation, and take the conduction duty cycle G 1 =0.5, direct duty ratio G 2 =0.5, resistive load R L =100Ω, the obtained DC output voltage waveforms under transient state and steady state are respectively as attached Figure 5 (a / b / c) shown.

[0167] It can be seen that when the non-over-conduction modulation mode is adopted, the average value of the output ...

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Abstract

The invention relates to a tap coupling inductance type non-isolated DC boost converter and a modulation method thereof. The tap coupling inductance type non-isolated DC boost converter comprises a coupling inductor with an intermediate tap, two fully-controlled power electronic switching devices, four power diodes and two capacitors. The circuit topology provided by the invention adopts two modulation modes such as non-conduction modulation and conduction modulation to obtain different voltage gain characteristics. The voltage gain is significantly higher than that of a traditional Boost circuit in conduction modulation, thereby being capable of meeting application requirements in high voltage gain occasions. Meanwhile, the topology contains two symmetrical switching tubes, thereby reducing the voltage stress, and adapting to application requirements of higher voltage grades.

Description

technical field [0001] The invention relates to the technical field of power electronic power conversion, in particular to a tap-coupled inductance non-isolated DC boost converter and a modulation method. Background technique [0002] DC boost converter is a kind of important power electronic conversion device, which is widely used in switching power supply, renewable energy generation and DC power system. Generally, DC boost converters can be divided into two types: isolated type and non-isolated type according to whether the input-output side is electrically isolated. Among them, the non-isolated DC boost converter has the advantages of high efficiency and high power density. It is widely used in photovoltaic power generation, switching power supply, active power factor correction and other fields. Its representative topology is the classic Boost topology. [0003] Restricted by its working principle, the boost capability of the classic Boost topology is weak, and the vol...

Claims

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Application Information

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IPC IPC(8): H02M3/07
CPCH02M3/07
Inventor 朱淼徐莉婷李修一何国庆李光辉孙艳霞袁晓冬
Owner CHINA ELECTRIC POWER RES INST
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