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Capacitive energy storage type isolated DC-DC converter and control method thereof

A DC-DC and capacitive energy storage technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, converting DC power input to DC power output, etc., can solve the problem of increased volume of isolation transformers, low power levels, and reduced power density, etc. problems, to achieve the effect of enhanced common mode noise suppression

Active Publication Date: 2022-03-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the constraints of the magnetic material characteristics of the isolation converter DC-DC converter, the power level is generally not high. Under high power and high current conditions, the design of the isolation transformer has become a difficult point in the industry, which limits the isolation DC-DC converter. Applications in High Power Scenarios
When the switching frequency decreases, the volume of the isolation transformer as a passive component increases significantly, reducing the power density

Method used

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  • Capacitive energy storage type isolated DC-DC converter and control method thereof
  • Capacitive energy storage type isolated DC-DC converter and control method thereof
  • Capacitive energy storage type isolated DC-DC converter and control method thereof

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Embodiment 1

[0039] Such as figure 1 , figure 2 As shown, one aspect of the present invention provides a capacitor C energy storage type isolated DC-DC converter, including a primary side loop, a secondary side loop, a capacitor C and a controller, wherein the primary side loop includes a series The first power semiconductor switching element T connected to form the first series branch 1U , the first power semiconductor switching element T 1M and the first power semiconductor switching element T 1L , connected in series with the first inductor L 1 The primary side DC voltage source and the first power semiconductor switching element T 1M connected in parallel; the secondary side circuit includes a fourth power semiconductor switching element T connected in series and forming a second series branch 2U , the fifth power semiconductor switching element T 2M and the sixth power semiconductor switching element T 2L , connected in series with a second inductor L 2 The secondary side DC ...

Embodiment 2

[0047] Other features of this embodiment are the same as those of Embodiment 1, the only difference is that the power semiconductor switch can be IGBT, reverse conduction IGBT, IGBT and diode in series, or diode. For example, if image 3 As shown, the power semiconductor switching device covers IGBT, reverse conduction IGBT and diode.

Embodiment 3

[0049] Other features of this embodiment are the same as those of Embodiment 1, the only difference is that the series combination of power semiconductor switching elements includes the series connection of IGBTs (such as Figure 4a ), the series connection of reverse conducting IGBTs (such as Figure 4b ), the overall series connection formed after the IGBT and the diode are connected in series (such as Figure 4c ), a series connection of diodes (as Figure 4d ), reverse-conducting IGBT anti-series (such as Figure 4e ).

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Abstract

The invention discloses a capacitive energy storage type isolated DC-DC converter and a control method thereof. The capacitive energy storage type isolated DC-DC converter comprises a primary side loop, a secondary side loop, a capacitor and a controller. According to the capacitor energy storage type isolated DC-DC converter, the energy of the input side is stored through the DC capacitor, and then the energy is released to the load side through the semiconductor switch. Energy is stored and released in a time-sharing mode, time-sharing energy exchange is carried out through capacitor buffering and input power and output power, electrical isolation of an input stage and an output stage is achieved by means of the isolation characteristic after a semiconductor device is turned off, and amplitude adjustment of output voltage or current can be achieved. Electrical isolation and buck-boost conversion of an input side and an output side can be realized without using an isolation transformer, and design and control are simple.

Description

technical field [0001] The invention relates to the field of power electronics and power transmission, and in particular to a capacitive energy storage type isolated DC-DC converter and a control method thereof. Background technique [0002] Isolated DC-DC converters are widely used in the field of power industry. Because of their advantages of high flexibility, good modularity and strong insulation performance, isolated DC-DC converters are widely used in aerospace, metallurgical industry, rail transit, marine ships, military industry and other fields. DC-DC converters have a wide range of applications. [0003] However, due to the constraints of the magnetic material characteristics of the isolation converter DC-DC converter, the power level is generally not high. Under high power and high current conditions, the design of the isolation transformer has become a difficult point in the industry, which limits the isolation DC-DC converter. Applications in high-power scenario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/12
CPCH02M3/33569H02M1/12
Inventor 马俊鹏王顺亮张芮刘天琪
Owner SICHUAN UNIV
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