Power converter and control method thereof

A technology for power converters and transformers, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, control/regulation systems, etc., can solve the problems of complex control methods and difficulty in realizing output current sharing.

Active Publication Date: 2020-12-22
SHANGHAI YIFINE ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a power converter and its control method, which are used to solve the technical problems of complex control mode and difficult realization of output current sharing when multiple LLC circuits are combined

Method used

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  • Power converter and control method thereof
  • Power converter and control method thereof
  • Power converter and control method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] The present application provides a power converter, which implements output current sharing and capacity expansion by connecting multiple resonant circuit units in parallel on the primary sides and connecting the secondary sides in series.

[0031] The power converter provided by the present application includes at least two resonant circuit units, the primary side input sides of the at least two resonant circuit units are connected in parallel between the positive and negative poles of the input power supply, and the secondary side output of the at least two resonant circuit units terminals are connected in series. Thus, the output voltage of the power converter is the sum of the output voltages of all resonant circuit units.

[0032] like figure 1 As shown, as an embodiment, the power converter includes four resonant circuit units—the first unit 110 , the second unit 120 , the third unit 130 and the fourth unit 140 . The positive poles of the primary sides of the fo...

Embodiment 2

[0046] The present application provides a control method matching the above power converter. Figure 8 It is a flow chart of the control method of the power converter provided by this application.

[0047] like Figure 8 As shown, the control method of the power converter includes the following steps:

[0048] S810: Output a given voltage for each resonant circuit unit, and the phase difference between the control pulses of two adjacent resonant circuit units is 1 / the total number of resonant circuit units (ie 1 / N). Wherein, the given voltage of each resonant circuit unit is the same.

[0049] S820: Accumulate output voltages of all resonant circuit units to obtain a collection voltage.

[0050] S830: Comparing the given voltage and the collected voltage to obtain a comparison result.

[0051] S840: According to the comparison result, uniformly control the given voltages of all the resonant circuit units, so as to control the frequency of each resonant circuit unit. Moreo...

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Abstract

The invention discloses a power converter and a control method thereof, and the power converter comprises at least two resonance circuit units, the primary side input sides of the at least two resonance circuit units are connected in parallel between the positive and negative electrodes of an input power supply, and the secondary side output ends of the at least two resonance circuit units are sequentially connected in series. In the application, although the voltage gain of each resonance circuit unit may be different due to the difference of component parameters or line arrangement geometricstructures, the output current of each resonance circuit unit is forced to be equal due to output series connection, so that the current sharing effect is achieved.

Description

technical field [0001] The present application relates to the technical field of power converters, in particular to a power converter and a control method thereof. Background technique [0002] The LLC circuit is one of the preferred topologies of the isolated DC / DC power converter. It has the characteristics of easy to realize soft switching on the primary and secondary sides of the power converter, and has low electromagnetic interference noise. The three-level LLC circuit is an extension of the basic LLC circuit. For the same power switch voltage tolerance, the allowable value of the input voltage is doubled. Therefore, this circuit is one of the better options for the isolated DC / DC circuit in the power converter under the condition of three-phase AC 380V power supply. [0003] In order to increase the power density of the converter, a higher switching frequency can be used. However, the power capacity of high-frequency electronic components is generally not as large a...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33569H02M3/33592H02M1/0077Y02B70/10
Inventor肖章钦吕遥张烨栋肖章程
OwnerSHANGHAI YIFINE ELECTRIC