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Control method of AC-DC converter, control device, output system and storage medium

A control method and technology of a control device, applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., can solve the problem of switching tube operating frequency changes, high research and development costs, AC-DC converter design Difficulties and other issues to achieve the effect of reducing R&D costs and avoiding design difficulties

Active Publication Date: 2018-10-09
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the pulse density modulation technology will lead to changes in the operating frequency of the switching tube, the performance requirements for the input and output filter circuits are very high, which leads to difficulties in the design of the AC-DC converter, resulting in high research and development costs.

Method used

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  • Control method of AC-DC converter, control device, output system and storage medium
  • Control method of AC-DC converter, control device, output system and storage medium
  • Control method of AC-DC converter, control device, output system and storage medium

Examples

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no. 1 example

[0029] see figure 1 , the embodiment of the present application provides an output system 10 , and the output system 10 includes: an AC-DC converter 11 and a control device 20 .

[0030] The AC-DC converter 11 can be an AC-DC converter of a common type on the market, wherein, figure 2 A topology diagram of the AC-DC converter 11 is shown. based on figure 2 According to the structure shown, the AC-DC converter 11 may include: a three-phase input terminal connected to a three-phase line, a switch matrix connected to the three-phase input terminal, a transformer connected to the switch matrix, a transformer connected to the transformer A rectification circuit, and a DC output terminal connected to the rectification circuit, and the DC output terminal is also used to connect with an external load.

[0031] In this embodiment, the switch matrix of the AC-DC converter 11 may include: 14 switch tubes, and each switch tube in the 14 switch tubes may be a field effect tube, and th...

no. 2 example

[0038] see Figure 4 , the embodiment of the present application provides a control method of an AC-DC converter, the control method of the AC-DC converter is applied to a control device connected to the AC-DC converter, the control method of the AC-DC converter, It includes: step S100, step S200, step S300 and step S400.

[0039] Step S100: Obtain the three-phase input parameters, resonance parameters and DC output parameters of the AC-DC converter, and determine the operation of the AC-DC converter according to the three-phase input parameters and the DC output parameters model.

[0040] In order to facilitate the control of the control device, the control device pre-divides a sinusoidal period of the three-phase signal into multiple time intervals, for example, the number of time intervals can be 12. Based on this, the polarity of the voltages of phase a, phase b and phase c in each time interval can be determined, and the relationship between the voltages of phase a, pha...

no. 3 example

[0182] see Figure 11 , the embodiment of the present application provides a control device 20, the processor 24 in the control device 20 includes:

[0183] A mode determination module 110, configured to obtain the three-phase input parameters, resonance parameters, and DC output parameters of the AC-DC converter, and determine the AC-DC output parameters according to the three-phase input parameters and the DC output parameters. The working mode of the converter.

[0184] A state determining module 120, configured to determine a state diagram of the AC-DC converter in the working mode according to the three-phase input parameters, the resonance parameters and the DC output parameters, the state diagram representing Parameters of each excitation state in at least one excitation state used to excite the AC-DC converter to work.

[0185] The duration determination module 130 is configured to obtain the duration of each excitation state according to the parameters of each excit...

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Abstract

The embodiment of the invention provides a control method of an AC-DC converter, a control device, an output system and a storage medium, and relates to the technical field of electrical control. Thecontrol method comprises the steps of obtaining a three-phase input parameter, a resonance parameter and a direct-current output parameter of the AC-DC converter, and determining a working mode of theAC-DC converter according to the three-phase input parameter and the direct-current output parameter; determining a state diagram of the AC-DC converter under the working mode according to the three-phase input parameter, the resonance parameter and the direct-current output parameter; obtaining the duration of each excitation state according to the parameters of each excitation state in the state diagram; and controlling the PWM conduction duration of a corresponding switch transistor in a switch matrix of the AC-DC converter according to the duration of each excitation state. When PWM control is adopted, the working frequency of the switch transistors is fixed, and particularly high performance requirements for input and output filter circuits are avoided, and therefore the technical problem that the design of the AC-DC converter is difficult due to the fact that the PDM is adopted is avoided, and the research and development cost of the AC-DC converter is reduced.

Description

technical field [0001] The present application relates to the technical field of electric control, and in particular, relates to a control method, a control device, an output system and a storage medium of an AC-DC converter. Background technique [0002] At present, in electrical control technology, pulse density modulation technology (Pulse Density Modulation, PDM) can be used to control the output voltage of the AC-DC converter. However, because the pulse density modulation technology will lead to changes in the operating frequency of the switching tube, the performance requirements for the input and output filter circuits are very high, which leads to difficulties in the design of the AC-DC converter, resulting in high research and development costs. Contents of the invention [0003] The present application aims to provide a control method, a control device, an output system and a storage medium of an AC-DC converter. [0004] Embodiments of the application are achie...

Claims

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Application Information

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IPC IPC(8): H02M7/217
CPCH02M7/217
Inventor 张政权
Owner SOUTHWEST JIAOTONG UNIV
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