Double-bootstrap three-level Zeta converter

A three-level, converter technology, applied in the direction of adjusting electrical variables, converting DC power input to DC power output, instruments, etc., can solve the problems of high loss, large equipment volume, and high cost, and achieve volume reduction and transformer reduction Equipment, cost saving effect

Active Publication Date: 2014-08-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high loss, large equipment volume and high loss in the conversion circuit and cascade converter that do not require isolation when the current topological structure of the main circuit of the DC converter is changed by adding a transformer or cascading. The problem of high cost, now provides dual bootstrap three-level Zeta converter

Method used

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  • Double-bootstrap three-level Zeta converter

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specific Embodiment approach 1

[0025] Specific implementation mode one: refer to figure 1 Describe this embodiment in detail, the dual-bootstrap three-level Zeta converter described in this embodiment includes: power supply Vin, capacitor Cd1 of No. 1, capacitor Cd2 of No. 2, capacitor Cb1 of No. 3, capacitor Cb2 of No. 4, capacitor No. 5 Capacitor Cb3, No. 6 capacitor Cb4, No. 7 capacitor Cf, No. 1 switch tube S1, No. 2 switch tube S2, No. 3 switch tube S3, No. 1 inductor L1, No. 2 inductor L2, No. 3 inductor L3, resistor Rf, a No. diode VD1, No. 2 diode VD2, No. 3 diode VD3, No. 4 diode VD4, No. 5 diode VD5 and No. 6 diode VD6;

[0026] The positive pole of the power supply Vin is simultaneously connected to one end of the first capacitor Cd1 and the source of the first switch tube S1,

[0027] The drain of the No. 1 switch tube S1 is simultaneously connected to one end of the No. 1 inductor L1, the anode of the No. 3 diode VD3, the anode of the No. 2 diode VD2, and one end of the No. 5 capacitor Cb3.

...

specific Embodiment approach 2

[0076] Embodiment 2: This embodiment is a further description of the dual-bootstrap three-level Zeta converter described in Embodiment 1. In this embodiment, the voltage of the power supply Vin is 10V.

specific Embodiment approach 3

[0077] Specific embodiment three: this embodiment is a further description of the dual-bootstrap three-level Zeta converter described in specific embodiment two. In this embodiment, the driving signals of the first switching tube S1 and the second switching tube S2 The frequency is 50kHz and the duty cycle is 0.7.

[0078] This specific implementation is studied by means of simulation. In the simulation process, the input voltage is selected to be 10V, the frequencies of the first switch tube S1 and the second switch tube S2 are both 50kHz, and the duty cycle is 0.7. The first switch tube S1, The second switching tube S2 and the third switching tube S3 realize complementary conduction. The voltage waveform at both ends of switch tube S1 is as follows: image 3 As shown, the voltage waveforms at both ends of the fifth diode VD5 and the sixth diode VD6 are as follows Figure 4 As shown, the converter output voltage waveform is as Figure 5 shown.

[0079] From image 3 , ...

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Abstract

The invention discloses a double-bootstrap three-level Zeta converter and belongs to the technical field of power electronic converters. The invention aims to solve the problems that loss in a conversion circuit and a cascade converter which do not need to be isolated is high, the equipment size is large and the cost is high when a topological structure of a direct current converter main circuit is changed by means of adding a transformer or utilizing cascade connection at present. According to the double-bootstrap three-level Zeta converter, a switching inductor circuit with an auxiliary switch is added on the basis of a topological structure of an original two-level Zeta converter circuit, so that a conversion ratio of the direct current converter is improved. The switching loss of the double-bootstrap three-level Zeta converter is 3 / 2n the switching loss under the condition that n circuits are in cascade connection with one another on the premise of the same effect with the traditional mode of increase of transformers and cascade connection of n circuits; and moreover the transformer equipment is reduced, so that the total equipment size is reduced, and the cost is saved. The invention is applied to modification of the topological structure of the direct current converter main circuit.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters. Background technique [0002] Currently, DC converters are widely used in electric vehicles, electric cleaning vehicles, mobile phones, and battery backup systems in renewable energy systems and uninterruptible power supplies. Although the traditional two-level DC converter is widely used and the technology is mature, its output voltage is limited by the circuit topology and cannot achieve a high voltage conversion ratio; in addition, in the case of high output voltage amplitude, the switch two The voltage stress on the terminal is relatively large, and the requirements for the value of the energy storage element are also relatively high. Due to the limitations of these factors, the traditional two-level DC converter cannot fully meet the requirements in the application. [0003] The relationship between the output voltage and the input voltage of the existing traditional DC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
Inventor 刘洪臣管恩惠赵丹周祺堃
Owner HARBIN INST OF TECH
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