Experimental test system for LLC direct-current power supply device

Abstract

The utility model belongs to the technical field of measurement, and particularly relates to an experimental test system for an LLC direct-current power supply device, which comprises a first transformer T1, a second transformer T2, an ACDC converter and a DCAC converter, and is characterized in that the primary side of the first transformer T1 is connected to a power grid; the primary side of the second transformer T2 is connected in parallel with the secondary side of the first transformer T1 and the alternating current output side of the DCAC converter, and the secondary side of the second transformer T2 is connected to the alternating current output side of the ACDC converter; the direct current output side of the ACDC converter is connected with the direct current side input side of the LLC direct current power supply device, and the direct current output side of the LLC direct current power supply device is connected with the direct current input side of the DCAC converter, so that the experimental test of three basic control operation modes of an output constant voltage mode, an input constant voltage mode and an input constant current mode of the LLC direct current power supply device is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the direct current power supply device experimental test technical field, specifically relates to a kind of experimental test system for LLC direct current power supply device. BACKGROUND

[0002] With the increasing demand for the operation function and operation mode of direct current power supply device, the simple output constant voltage mode of LLC direct current power supply device cannot meet the product demand, and the output constant voltage mode, input constant voltage mode and input constant current mode are widely used as the three basic operation modes of LLC direct current power supply device. However, for newly developed products, it is urgent to build an experimental test platform to test and verify the three basic operation functions of LLC direct current power supply device. SUMMARY

[0003] To solve the technical problems in the background art, the utility model provides an experimental test system for LLC direct current power supply device, which can meet the experimental test of the output constant voltage mode, input constant voltage mode and input constant current mode of LLC direct current power supply device.

[0004] To achieve the above technical solutions, the utility model provides an experimental test system for LLC direct current power supply device, which comprises a first transformer T1, a second transformer T2, an ACDC converter and a DCAC converter.

[0005] The primary side of the first transformer T1 is connected to the power grid, and the secondary side of the first transformer T1 is connected to the primary side of the T2 transformer and the AC output side of the DCAC bidirectional converter. The primary side of the second transformer T2 is connected in parallel with the secondary side of the first transformer T1 and the AC output side of the DCAC converter, and the secondary side of the second transformer T2 is connected to the AC output side of the ACDC converter. The DC output side of the ACDC converter is connected to the DC input side of the LLC direct current power supply device, and the DC output side of the LLC direct current power supply device is connected to the DC input side of the DCAC converter.

[0006] Further, the DCAC converter uses a DCAC bidirectional converter, and the ACDC converter also uses a DCAC bidirectional converter.

[0007] Further, the DCAC bidirectional converter and the ACDC bidirectional converter use a bidirectional converter using a droop control strategy.

[0008] The utility model has the advantages of:

[0009] The utility model discloses a structure for the experimental test system of LLC direct current power supply device, including ACDC two -way converter, DCAC two -way converter, first transformer T1 and second transformer T2, ACDC two -way converter's DC output side and LLC direct current power supply device's DC side input are connected, and the DC output side of LLC direct current power supply device and DCAC two -way converter's DC input side are connected, thereby realizing the experimental test of the output constant voltage mode, input constant voltage mode, input constant current mode three basic control operation mode of LLC direct current power supply device.

[0010] Advantages of the additional aspects of the utility model will be partly given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0011] The drawings accompanying the specification of the utility model form a part of the utility model and serve to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof serve to explain the utility model, and do not constitute improper limitation on the utility model.

[0012] Figure 1 It is a structure schematic diagram for the experimental test system of LLC direct current power supply device of the utility model.

[0013] Figure 2 It is the voltage characteristic curve diagram of two -way converter of the utility model.

[0014] 1-ACDC two -way converter;2-DCAC two -way converter;3-second transformer T2;4-first transformer T1. DETAILED DESCRIPTION

[0015] The utility model will be further described below in conjunction with the drawings and embodiments.

[0016] It should be pointed out that the following detailed description is all exemplary, and aims at providing further explanation of the utility model. Unless otherwise indicated, each technical and scientific term used in the embodiment has the same meaning as that understood by ordinary maintenance personnel in the technical field to which the utility model belongs.

[0017] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, it means that the features, steps, operations, devices, components and / or their combinations exist.

[0018] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.

[0019] In this utility model, terms such as "fixed connection," "connected," and "joined" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For researchers or maintenance personnel in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0020] Example 1:

[0021] like Figure 1 As shown, this embodiment provides an experimental testing system for LLC DC power supply devices, including: a first transformer T1, a second transformer T2, an AC-DC bidirectional converter, and a DC-AC bidirectional converter;

[0022] The primary side of the first transformer T1 is connected to the power grid, and the secondary side of the first transformer T1 is connected to the primary side of the transformer T2 and the AC output side of the DCAC bidirectional converter. The primary side of the second transformer T2 is connected in parallel with the secondary side of the first transformer T1 and the AC output side of the DCAC bidirectional converter. The secondary side of the second transformer T2 is connected to the AC output side of the ACCDC bidirectional converter. The DC output side of the ACCDC bidirectional converter is connected to the DC input side of the LLC DC power supply unit, and the DC output side of the LLC DC power supply unit is connected to the DC input side of the DCAC bidirectional converter.

[0023] The turns ratio of the first transformer T1 and the second transformer T2 can be determined according to the voltage operating range of the input and output sides of the LLC DC power supply device.

[0024] This embodiment takes an LLC DC power supply with an input voltage range of 500V-600V and an output voltage range of 1500V-1800V as an example. Therefore, a transformer with a turns ratio of 380V / 1000V can be selected as the first transformer T1, and a transformer with a turns ratio of 1180V / 380V can be selected as the second transformer T2. From this, the DC no-load voltage of the ACDC bidirectional converter can be calculated as follows:

[0025] 380÷380×1000÷1180×380×1.414=455V (1)

[0026] The DC no-load voltage of the DCAC bidirectional converter is:

[0027] 380÷380×1000×1.414=1414V (2)

[0028] The DC no-load voltage of the ACDC bidirectional converter is 455V, so the DC voltage target value can be adjusted in the range of 500V-600V when the ACDC bidirectional converter operates in the rectification mode, satisfying the input side voltage range test condition of the LLC DC power supply device;

[0029] The DC no-load voltage of the DCAC bidirectional converter is 1414V, so the DC voltage can normally experiment the load feedback function in the range of 1500V-1800V when the DCAC bidirectional converter operates in the inversion mode, satisfying the output side voltage range test condition of the LLC DC power supply device.

[0030] Figure 2 The voltage characteristic curve of the bidirectional converter is shown. According to the curve, when the voltage is in the first quadrant, the bidirectional converter is in the rectification mode, and when the voltage is in the second quadrant, the bidirectional converter is in the inversion mode. The bidirectional converter in this paper includes the DCAC bidirectional converter and the ACDC bidirectional converter.

[0031] The bidirectional converter measured by using the droop control is used, that is, when the bidirectional converter operates in the rectification mode, the output voltage decreases with the increase of the output current, and when the bidirectional converter operates in the inversion mode, the output voltage increases with the increase of the output current, which can be described by the following formula:

[0032] U dc =U0-R dp ·I dc (3)

[0033] Wherein U0 is the starting voltage of the bidirectional converter, Udc is the actual voltage output by the bidirectional converter, and Idc is the actual current output by the bidirectional converter, wherein Idc is positive when the bidirectional converter operates in the rectification mode, and Idc is negative when the bidirectional converter operates in the inversion mode.

[0034] In this embodiment, the method for realizing the test of the LLC DC power supply device is as follows:

[0035] The ratio of the first transformer T1 is 380V / 1000V, the ratio of the second transformer T2 is 1180V / 380V, the DC no-load voltage of the bidirectional converter ACDC is 455V, the DC no-load voltage of the bidirectional converter DCAC is 1414V, the input voltage range of the LLC DC power supply device is 500V-600V, the output voltage range is 1500V-1800V, the maximum power of the LLC DC power supply device matches the maximum power of the two bidirectional converters, therefore the starting voltage U0 of the ACDC bidirectional converter can be set to 600V, the maximum droop voltage Urm is 500V, and the ACDC bidirectional converter is controlled to operate in a rectification mode to provide a DC voltage for the input side of the LLC DC power supply device; the starting voltage U0 of the DCAC bidirectional converter is 1500V, the maximum incremental voltage Uim is 1600V, and the DCAC bidirectional converter is controlled to operate in an inverter mode to provide a load for the output side of the LLC DC power supply device.

[0036] When the LLC DC power supply device tests the output voltage mode, the output voltage target value can be set to any voltage value Uin between U0-Uim, at this time the DCAC bidirectional converter operates in a power state corresponding to the current value Iin based on the voltage value Uin to provide a load for the LLC DC power supply device, and the output voltage target value of the LLC DC power supply device can be dynamically adjusted between U0-Uim.

[0037] When the LLC DC power supply device tests the input voltage mode, the input voltage target value can be set to any voltage value Urn between U0-Urm, at this time the ACDC bidirectional converter operates in a power state corresponding to the current value Irn based on the voltage value Urn to provide energy for the LLC DC power supply device, and the input voltage target value of the LLC DC power supply device can be dynamically adjusted between U0-Urm.

[0038] When the LLC DC power supply device tests the input current mode, the input current target value can be set to any current value Irn between 0-Irm, at this time the ACDC bidirectional converter operates in a power state corresponding to the voltage value Urn based on the current value Irn to provide energy for the LLC DC power supply device, and the input current target value of the LLC DC power supply device can be dynamically adjusted between 0-Irm.

[0039] Through the design of the LLC DC power supply device experimental test platform, combined with the voltage droop characteristics of the bidirectional converter, the experimental test verification work of the three basic control operation modes of the LLC DC power supply device, output constant voltage mode, input constant voltage mode and input constant current mode, can be met.

[0040] The same or similar parts among various embodiments in the specification can be referred to each other. Especially, for the terminal embodiment, since it is basically similar to the method embodiment, the description is simple, and the relevant part can be referred to the description in the method embodiment.

[0041] The units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, that is, can be located in one place, or can be distributed to multiple network units. Part or all of the units can be selected to achieve the purpose of the embodiment.

[0042] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An experimental test system for an LLC DC power supply device, characterized by, Comprise: The first transformer T1, the second transformer T2, the ACDC converter and the DCAC converter; The primary side of the first transformer T1 is connected to the power grid, and the secondary side of the first transformer T1 is connected to the primary side of the T2 transformer and the AC output side of the DCAC bidirectional converter; The primary side of the second transformer T2 is connected in parallel with the secondary side of the first transformer T1 and the AC output side of the DCAC converter, and the secondary side of the second transformer T2 is connected to the AC output side of the ACDC converter; the DC side input of the LLC DC power supply device is connected to the DC output side of the ACDC converter, and the DC output side of the LLC DC power supply device is connected to the DC input side of the DCAC converter.

2. The experimental test system for LLC DC power supply device according to claim 1, characterized in that, The DCAC converter adopts a DCAC bidirectional converter; the ACDC converter adopts a DCAC bidirectional converter.

3. The experimental test system for LLC DC power supply device according to claim 2, characterized in that, The DCAC bidirectional converter and the ACDC bidirectional converter adopt a bidirectional converter using a droop control strategy.

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