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A capacitor energy storage type isolated dc-dc converter and its control method

A technology of DC-DC and capacitive energy storage, which is applied in the direction of adjusting electrical variables, control/regulation systems, converting DC power input to DC power output, etc. It 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: 2022-04-15
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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  • A capacitor energy storage type isolated dc-dc converter and its control method
  • A capacitor energy storage type isolated dc-dc converter and its control method
  • A capacitor energy storage type isolated dc-dc converter and its control method

Examples

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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 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 conduction IGBT (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 (such as Figure 4d ), reverse-conducting IGBT anti-series (such as Figure 4e ).

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Abstract

The invention discloses a capacitor energy storage type isolated DC-DC converter and a control method thereof. The capacitor energy storage type isolated DC-DC converter includes a primary side circuit, a secondary side circuit, a capacitor and a controller. The capacitive energy storage type isolated DC-DC converter of the present invention stores the energy on the input side through the DC capacitor, and then releases the energy to the load side through the semiconductor switch. The storage and release of energy have time-sharing characteristics, through capacitive buffering, time-sharing energy exchange between input power and output power, using the isolation characteristics of semiconductor devices after they are turned off, to achieve electrical isolation from the input stage and output stage, and to achieve output Amplitude regulation of voltage or current. The electrical isolation of the input side and the output side and the buck-boost conversion can be realized without using an isolation transformer, which has the advantages of simple design and control.

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 Patents(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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