DC converter

Abstract

The utility model provides a direct current converter, which relates to the field of power supply processing and comprises a first transformer, a second transformer, a first voltage stabilizing unit, a second voltage stabilizing unit, a first switch unit and a second switch unit. The first transformer comprises a first primary side unit and a first secondary side unit, and the second transformer comprises a second primary side unit and a second secondary side unit; the first primary side and the second primary side are connected in series and are used for accessing an input voltage; a first output end of the second voltage stabilizing unit is connected with a second end of the first switch unit and a first end of the second switch unit respectively; the second end and the fourth end of the second switch unit are used for being connected with a load and outputting rectified voltage to the load. According to the utility model, voltage sharing can be automatically carried out according to the power demand of a load, so that a specified rectified voltage is output, and meanwhile, the problem that the direct current density of a transformer in a direct current converter is too large can be solved.

Description

Technical Field

[0001] This utility model relates to the field of power supply processing, and more specifically, to a DC-DC converter. Background Technology

[0002] DC-DC converters, as key power electronic devices, function to efficiently convert a DC power supply of a specific specification into another DC power supply with different output characteristics to meet the power supply needs of various load devices. However, under the current technological background, the design and application of DC-DC converters face some significant technical challenges. In particular, the problem of excessive transformer power density is particularly prominent, which not only increases the overall size and weight of the device, limiting its application potential in certain compact spaces, but also leads to higher energy consumption and manufacturing costs.

[0003] Furthermore, rectifier diodes, as crucial components in DC-DC converters, are responsible for filtering out AC components to ensure a clean DC output. However, in high-power-density operating environments, rectifier diodes often generate significant heat. If this heat cannot be effectively dissipated, it will severely threaten their operational stability and lifespan. Excessive temperature not only degrades diode performance but can also trigger serious faults such as thermal breakdown, thereby affecting the reliability and safety of the entire DC-DC converter.

[0004] Therefore, how to solve the problems of excessive power density of transformers and heat dissipation risks of rectifier diodes in DC converters has become a hot topic and a difficult point in the current field of power electronics research. Utility Model Content

[0005] The purpose of this invention is to provide a DC converter that can automatically equalize voltage according to the power demand of the load, thereby outputting a specified rectified voltage. At the same time, it can also solve the problem of excessive DC density in the transformer of the DC converter.

[0006] This utility model provides a DC-DC converter, including: a first transformer, a second transformer, a first voltage regulator unit, a second voltage regulator unit, a first switching unit, and a second switching unit;

[0007] The first transformer includes a first primary side and a first secondary side unit, and the second transformer includes a second primary side and a second secondary side unit;

[0008] The first primary side is connected in series with the second primary side and is used to connect to the input voltage. The first end of the first secondary side unit is connected to the first input end of the first voltage regulator unit. The second end of the first secondary side unit is connected to the third end of the second secondary side unit, the first end of the first switching unit, and the third end of the second switching unit. The third end of the first secondary side unit is connected to the second end of the second secondary side unit and the fourth end of the second switching unit. The fourth end of the first secondary side unit is connected to the second input end of the first voltage regulator unit.

[0009] The first output terminal of the first voltage regulator unit is connected to the second output terminal of the second voltage regulator unit and the second terminal of the second switching unit, respectively; the second output terminal of the first voltage regulator unit is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively.

[0010] The first end of the second secondary side unit is connected to the first input end of the second voltage regulator unit, the second end of the second secondary side unit is connected to the third end of the first secondary side unit and the fourth end of the second switching unit, the third end of the second secondary side unit is connected to the second end of the first secondary side unit, the first end of the first switching unit and the third end of the second switching unit, and the fourth end of the second secondary side unit is connected to the second input end of the second voltage regulator unit.

[0011] The first output terminal of the second voltage regulator unit is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively; the second terminal and the fourth terminal of the second switching unit are used to connect to the load and output the rectified voltage to the load.

[0012] In one possible implementation, it also includes: a first filtering unit and a second filtering unit;

[0013] The first end of the first filter unit is connected to the first output end of the first voltage regulator unit and the second end of the second switch unit, respectively; the second end of the first filter unit is connected to the second end of the first secondary side unit and the first end of the first switch unit, respectively.

[0014] The first end of the second filtering unit is connected to the second output end of the first voltage regulator unit, the first output end of the second voltage regulator unit, and the second end of the first switching unit. The second end of the second filtering unit is connected to the third end of the first secondary side unit, the second end of the second secondary side unit, and the fourth end of the second switching unit.

[0015] In one possible implementation, the first filtering unit includes a first capacitor, and the second filtering unit includes a second capacitor.

[0016] In one possible implementation, the first secondary edge unit includes: a first secondary edge and a second secondary edge;

[0017] The first end of the first secondary side is connected to the first input terminal of the first voltage regulator unit, and the second end of the first secondary side is connected to the third end of the second secondary side unit, the first end of the first switching unit, and the third end of the second switching unit, respectively.

[0018] The first end of the second secondary side is connected to the second end of the second secondary side unit and the fourth end of the second switching unit, respectively, and the second end of the second secondary side is connected to the second input end of the first voltage regulator unit.

[0019] In one possible implementation, the second secondary edge unit includes: a third secondary edge and a fourth secondary edge;

[0020] The first end of the third secondary side is connected to the first input end of the second voltage regulator unit, and the second end of the third secondary side is connected to the third end of the first secondary side unit and the fourth end of the second switching unit, respectively.

[0021] The first end of the fourth secondary side is connected to the second end of the first secondary side unit, the first end of the first switching unit, and the third end of the second switching unit, respectively, and the second end of the fourth secondary side is connected to the second input end of the second voltage regulator unit.

[0022] In one possible implementation, the first voltage regulator unit includes: a first rectifier diode and a second rectifier diode;

[0023] The positive terminal of the first rectifier diode is connected to the first end of the first secondary side unit, and the negative terminal of the first rectifier diode is connected to the second output terminal of the second voltage regulator unit and the second end of the second switching unit, respectively.

[0024] The positive terminal of the second rectifier diode is connected to the fourth terminal of the first secondary side unit, and the negative terminal of the second rectifier diode is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively.

[0025] In one possible implementation, the second voltage regulator unit includes: a third rectifier diode and a fourth rectifier diode;

[0026] The positive terminal of the third rectifier diode is connected to the first terminal of the second secondary side unit, and the negative terminal of the third rectifier diode is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively.

[0027] The positive terminal of the fourth rectifier diode is connected to the fourth terminal of the second secondary unit, and the negative terminal of the fourth rectifier diode is connected to the fourth terminal of the second secondary unit.

[0028] In one possible implementation, the first switching unit includes: a first switch.

[0029] In one possible implementation, the second switching unit includes: a second switch and a third switch;

[0030] The first end of the second switch is connected to the second output end of the first voltage regulator unit and the second end of the first switch unit, and the second end of the second switch is connected to the first output end of the first voltage regulator unit and the second output end of the second voltage regulator unit.

[0031] The first end of the third switch is connected to the second end of the first secondary side unit, the third end of the second secondary side unit, and the first end of the first switch unit. The second end of the third switch is connected to the second end of the second secondary side unit and the third end of the first secondary side unit.

[0032] One possible implementation also includes: a third capacitor;

[0033] One end of the third capacitor is connected to one end of the second primary side, and the other end of the third capacitor is used to connect to the load.

[0034] The beneficial effects of the invention provided by this utility model are as follows: By setting a first transformer, a second transformer, a first voltage regulator unit, a second voltage regulator unit, a first switching unit, and a second switching unit in the DC-DC converter, it is possible to automatically equalize the voltage according to the power demand of the load, thereby outputting a specified rectified voltage. At the same time, by setting the first transformer and the second transformer, the granularity of the transformer in the DC-DC converter is reduced, solving the problem of excessive DC density of the transformer in the DC-DC converter. Furthermore, by setting the first voltage regulator unit and the second voltage regulator unit, the loss of the voltage regulator unit can be reduced, and the heat dissipation risk can be reduced. As a result, the DC-DC converter provided by this utility model embodiment has high DC-DC conversion efficiency and can flexibly output rectified voltage. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1A schematic diagram of a DC-DC converter provided in an embodiment of this utility model;

[0037] Figure 2 Another structural schematic diagram of the DC-DC converter provided in this embodiment of the present invention;

[0038] Figure 3 A schematic diagram of a first secondary unit in a DC-DC converter provided in an embodiment of this utility model;

[0039] Figure 4 A schematic diagram of a second secondary unit in a DC-DC converter provided in an embodiment of this utility model;

[0040] Figure 5 A schematic diagram of the structure of the first voltage regulation unit in a DC-DC converter provided in this embodiment of the present invention;

[0041] Figure 6 A schematic diagram of the structure of the second voltage regulation unit in a DC-DC converter provided in this embodiment of the present invention;

[0042] Figure 7 A schematic diagram of the structure of the second voltage regulation unit in a DC-DC converter provided in this embodiment of the present invention;

[0043] Figure 8 This is another schematic diagram of the structure of the DC-DC converter provided in the embodiment of the present utility model;

[0044] Figure 9 This is another structural schematic diagram of a DC-DC converter provided in an embodiment of the present invention.

[0045] Icons: First primary side - T1; Second primary side - T2; First capacitor - C1; Second capacitor - C2; First secondary side - L1; Second secondary side - L2; Third secondary side - L3; Fourth secondary side - L4; First rectifier diode - D1; Second rectifier diode - D2; Third rectifier diode - D3; Fourth rectifier diode - D4; First switch - K1; Second switch - K2; Third switch - K3; Third capacitor - C3. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0048] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0049] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0051] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] How to solve the problems of excessive power density of transformers and heat dissipation risks of rectifier diodes in DC converters has become a hot topic and a difficult point in the current field of power electronics research.

[0053] Based on the aforementioned problems, this utility model proposes a DC-DC converter. By incorporating a first transformer, a second transformer, a first voltage regulator unit, a second voltage regulator unit, a first switching unit, and a second switching unit, the converter can automatically equalize voltage according to the load's power demand, thereby outputting a specified rectified voltage. Furthermore, by including the first and second transformers, the granularity of the transformers in the DC-DC converter is reduced, solving the problem of excessive DC density in the transformers. Additionally, by including the first and second voltage regulator units, the losses of the voltage regulator units can be reduced, lowering the risk of heat dissipation. Therefore, the DC-DC converter provided by this utility model has high DC-DC conversion efficiency and can flexibly output a specified rectified voltage.

[0054] Figure 1 Please refer to the schematic diagram of a DC-DC converter provided in an embodiment of this utility model. Figure 1 This embodiment provides a DC-DC converter, which includes: a first transformer, a second transformer, a first voltage regulator unit, a second voltage regulator unit, a first switching unit, and a second switching unit.

[0055] The first transformer includes a first primary side T1 and a first secondary side unit, and the second transformer includes a second primary side T2 and a second secondary side unit.

[0056] Optionally, the first transformer and the second transformer are different transformers, and the turns ratio of the primary side to the secondary side of the second transformer is greater than the turns ratio of the primary side to the secondary side of the first transformer.

[0057] The first primary side T1 and the second primary side T2 are connected in series and used to connect the input voltage. The first terminal of the first secondary side unit is connected to the first input terminal of the first voltage regulator unit. The second terminal of the first secondary side unit is connected to the third terminal of the second secondary side unit, the first terminal of the first switching unit, and the third terminal of the second switching unit. The third terminal of the first secondary side unit is connected to the second terminal of the second secondary side unit and the fourth terminal of the second switching unit. The fourth terminal of the first secondary side unit is connected to the second input terminal of the first voltage regulator unit.

[0058] The first output terminal of the first voltage regulator unit is connected to the second output terminal of the second voltage regulator unit and the second terminal of the second switching unit, respectively. The second output terminal of the first voltage regulator unit is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively.

[0059] The first end of the second secondary side unit is connected to the first input end of the second voltage regulator unit. The second end of the second secondary side unit is connected to the third end of the first secondary side unit and the fourth end of the second switching unit. The third end of the second secondary side unit is connected to the second end of the first secondary side unit, the first end of the first switching unit, and the third end of the second switching unit. The fourth end of the second secondary side unit is connected to the second input end of the second voltage regulator unit.

[0060] The first output terminal of the second voltage regulator unit is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively; the second terminal and the fourth terminal of the second switching unit are used to connect to the load and output the rectified voltage to the load.

[0061] Optionally, the first voltage regulator unit and the second voltage regulator unit are used to rectify and protect the voltage output by the first secondary side unit and the second secondary side unit.

[0062] Optionally, the first switching unit and the second switching unit in the DC converter provided by this utility model can be turned on under the control of the control unit, so that the first primary side T1 and the second primary side T2 are used to connect to the DC voltage to be transformed, and the DC voltage to be transformed is output to the first voltage regulator unit and the second voltage regulator unit after being transformed by the first transformer and the second transformer, so as to output the rectified voltage to the load through the first switching unit or the second switching unit.

[0063] For example, the DC converter provided by this utility model can be applied to any scenario that requires DC conversion of voltage, such as a charging module.

[0064] For example, the control unit in the charging module can determine the rectified voltage required by the load. When the rectified voltage required by the load is greater than a preset threshold, it can control the first switching unit to turn on and the second switching unit to turn off, thereby connecting the input voltage through the first and second transformers. A series circuit is formed by the first transformer, the second transformer, the first voltage regulator unit, the second voltage regulator unit, and the first switching unit to achieve DC-DC conversion of the input voltage to output the rectified voltage required by the load. The rectified voltage required by the load is a voltage greater than the preset threshold.

[0065] For example, the control unit in the charging module can determine the rectified voltage required by the load. When the rectified voltage required by the load is less than a preset threshold, it can control the second switching unit to turn on and the first switching unit to turn off. This allows the input voltage to be connected through the first and second transformers, and a parallel circuit is formed through the first transformer, the second transformer, the first voltage regulator unit, the second voltage regulator unit, and the second switching unit to achieve DC-DC conversion of the input voltage to output the rectified voltage required by the load. The rectified voltage required by the load is a voltage less than the preset threshold.

[0066] In this embodiment, by setting a first transformer, a second transformer, a first voltage regulator unit, a second voltage regulator unit, a first switching unit, and a second switching unit in the DC-DC converter, voltage equalization can be automatically performed according to the power demand of the load, thereby outputting a specified rectified voltage. At the same time, by setting the first transformer and the second transformer, the granularity of the transformer in the DC-DC converter is reduced, solving the problem of excessive DC density of the transformer in the DC-DC converter. Furthermore, by setting the first voltage regulator unit and the second voltage regulator unit, the loss of the voltage regulator unit can be reduced, and the heat dissipation risk can be reduced. As a result, the DC-DC converter provided by this embodiment has high DC-DC conversion efficiency and can flexibly output rectified voltage.

[0067] In one possible implementation, Figure 2 This is another structural schematic diagram of the DC-DC converter provided in an embodiment of the present invention, referred to... Figure 2 As shown, in Figure 1 Based on this, the DC converter provided by this utility model also includes: a first filter unit and a second filter unit.

[0068] The first end of the first filter unit is connected to the first output end of the first voltage regulator unit and the second end of the second switch unit, respectively. The second end of the first filter unit is connected to the second end of the first secondary unit and the first end of the first switch unit, respectively.

[0069] Optionally, the second end of the first filtering unit is also connected to the third end of the second switching unit.

[0070] The first end of the second filter unit is connected to the second output end of the first voltage regulator unit, the first output end of the second voltage regulator unit, and the second end of the first switch unit. The second end of the second filter unit is connected to the third end of the first secondary side unit, the second end of the second secondary side unit, and the fourth end of the second switch unit.

[0071] Optionally, the first end of the second filtering unit is also connected to the first end of the second switching unit.

[0072] Optionally, when the first transformer, the second transformer, the first voltage regulator unit, the second voltage regulator unit, and the first switching unit form a series circuit, the first filter unit and the second filter unit are used to filter out high-frequency waves from the voltage output by the series circuit, thereby improving the stability of the DC converter provided by this utility model.

[0073] Optionally, when the first transformer, the second transformer, the first voltage regulator unit, the second voltage regulator unit, and the first switching unit form a parallel circuit, the first filter unit and the second filter unit are used to filter out high-frequency waves from the voltage output by the parallel circuit, thereby improving the stability of the DC converter provided by this utility model.

[0074] In one possible implementation, the first filter unit includes a first capacitor C1, and the second filter unit includes a second capacitor C2.

[0075] Optionally, one end of the first capacitor C1 is connected to the first output terminal of the first voltage regulator unit and the second terminal of the second switching unit, respectively, and the other end of the first capacitor C1 is connected to the second terminal of the first secondary unit and the first terminal of the first switching unit, respectively.

[0076] Optionally, one end of the second capacitor C2 is connected to the second output terminal of the first voltage regulator unit, the first output terminal of the second voltage regulator unit, and the second terminal of the first switching unit, and the other end of the second capacitor C2 is connected to the third terminal of the first secondary unit, the second terminal of the second secondary unit, and the fourth terminal of the second switching unit. The first capacitor C1 and the second capacitor C2 can be selected according to the requirements of the charging module.

[0077] In one possible implementation, Figure 3 A schematic diagram of the structure of the first secondary unit in a DC-DC converter provided in this embodiment of the present invention is shown below. Figure 3 As shown, in Figure 1 Based on this, the first secondary edge unit includes: the first secondary edge L1 and the second secondary edge L2.

[0078] The first end of the first secondary side L1 is connected to the first input terminal of the first voltage regulator unit, and the second end of the first secondary side L1 is connected to the third terminal of the second secondary side unit, the first terminal of the first switching unit, and the third terminal of the second switching unit, respectively. The first end of the second secondary side L2 is connected to the second terminal of the second secondary side unit and the fourth terminal of the second switching unit, respectively, and the second end of the second secondary side L2 is connected to the second input terminal of the first voltage regulator unit.

[0079] Optionally, the first secondary side L1 and the second secondary side L2 are alternately connected to the first voltage regulator unit, the second voltage regulator unit, the first switching unit, and the second switching unit for full-wave rectification. The first secondary side L1 and the second secondary side L2 are used to transform the input voltage from the first primary side T1 and deliver the transformed input voltage to the first voltage regulator unit, the second voltage regulator unit, the first switching unit, and the second switching unit, so that when the first switching unit or the second switching unit is turned on, a series or parallel circuit can be formed to output voltage to the load.

[0080] In one possible implementation, Figure 4 A schematic diagram of a second secondary unit in a DC-DC converter provided in this embodiment of the present invention is shown below. Figure 4 As shown, in Figure 1 Based on this, the second secondary edge unit includes: the third secondary edge L3 and the fourth secondary edge L4.

[0081] The first end of the third secondary side L3 is connected to the first input terminal of the second voltage regulator unit, and the second end of the third secondary side L3 is connected to the third terminal of the first secondary side unit and the fourth terminal of the second switching unit, respectively. The first end of the fourth secondary side L4 is connected to the second terminal of the first secondary side unit, the first terminal of the first switching unit and the third terminal of the second switching unit, respectively, and the second end of the fourth secondary side L4 is connected to the second input terminal of the second voltage regulator unit.

[0082] Optionally, the third secondary side L3 and the fourth secondary side L4 are alternately connected to the first voltage regulator unit, the second voltage regulator unit, the first switching unit, and the second switching unit for full-wave rectification. The third secondary side L3 and the fourth secondary side L4 are used to transform the input voltage from the second primary side T2 and deliver the transformed input voltage to the first voltage regulator unit, the second voltage regulator unit, the first switching unit, and the second switching unit, so that when the first switching unit or the second switching unit is turned on, a series or parallel circuit can be formed to output voltage to the load.

[0083] In one possible implementation, Figure 5 A schematic diagram of the first voltage regulation unit in a DC-DC converter provided in this embodiment of the present invention is shown below. Figure 5 As shown, in Figure 1 Based on this, the first voltage regulator unit includes: a first rectifier diode D1 and a second rectifier diode D2.

[0084] The positive terminal of the first rectifier diode D1 is connected to the first terminal of the first secondary unit, and the negative terminal of the first rectifier diode D1 is connected to the second output terminal of the second voltage regulator unit and the second terminal of the second switching unit, respectively; the positive terminal of the second rectifier diode D2 is connected to the fourth terminal of the first secondary unit, and the negative terminal of the second rectifier diode D2 is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively.

[0085] Optionally, when the first transformer, the second transformer, the first voltage regulator unit, the second voltage regulator unit, and the first switching unit form a series circuit, the first rectifier diode D1 and the second rectifier diode D2 are used to regulate the voltage in the series circuit and rectify the current in the series circuit, thereby improving the stability of the DC converter provided by this utility model when outputting voltage to the load.

[0086] Optionally, when the first transformer, the second transformer, the first voltage regulator unit, the second voltage regulator unit, and the first switching unit form a parallel circuit, the first rectifier diode D1 and the second rectifier diode D2 are used to regulate the voltage in the parallel circuit and rectify the current in the parallel circuit, thereby improving the stability of the DC converter provided by this utility model when outputting voltage to the load.

[0087] In one possible implementation, Figure 6 A schematic diagram of a second voltage regulation unit in a DC-DC converter provided in this embodiment of the present invention is shown below. Figure 6 As shown, in Figure 1 Based on this, the second voltage regulator unit includes: a third rectifier diode D3 and a fourth rectifier diode D4.

[0088] The positive terminal of the third rectifier diode D3 is connected to the first terminal of the second secondary unit, and the negative terminal of the third rectifier diode D3 is connected to the second terminal of the first switching unit and the first terminal of the second switching unit respectively; the positive terminal of the fourth rectifier diode D4 is connected to the fourth terminal of the second secondary unit, and the negative terminal of the fourth rectifier diode D4 is connected to the fourth terminal of the second secondary unit.

[0089] Optionally, when the first transformer, the second transformer, the first voltage regulator unit, the second voltage regulator unit, and the first switching unit form a series circuit, the third rectifier diode D3 and the fourth rectifier diode D4 are used to regulate the voltage in the series circuit and rectify the current in the series circuit, thereby improving the stability of the DC converter provided by this utility model when outputting voltage to the load.

[0090] Optionally, when the first transformer, the second transformer, the first voltage regulator unit, the second voltage regulator unit, and the first switching unit form a parallel circuit, the third rectifier diode D3 and the fourth rectifier diode D4 are used to regulate the voltage in the parallel circuit and rectify the current in the series circuit, thereby improving the stability of the DC converter provided by this utility model when outputting voltage to the load.

[0091] In one possible implementation, the first switching unit includes: a first switch K1.

[0092] Optionally, one end of the first switch K1 serves as the first end of the first switch unit, and the other end of the first switch K1 serves as the other end of the first switch unit.

[0093] Optionally, the first switch K1 serves as a control switch for the series circuit, used to control the formation of the series circuit in this invention. When the first switch K1 is turned on, a series circuit is formed in the DC-DC converter provided by this invention, thereby outputting a voltage greater than a preset threshold to the load.

[0094] In one possible implementation, Figure 7 A schematic diagram of a second voltage regulation unit in a DC-DC converter provided in this embodiment of the present invention is shown below. Figure 7 As shown, in Figure 1 Based on this, the second switching unit includes: a second switch K2 and a third switch K3.

[0095] The first end of the second switch K2 is connected to the second output end of the first voltage regulator unit and the second end of the first switch unit, and the second end of the second switch K2 is connected to the first output end of the first voltage regulator unit and the second output end of the second voltage regulator unit.

[0096] The first end of the third switch K3 is connected to the second end of the first secondary side unit, the third end of the second secondary side unit, and the first end of the first switch unit. The second end of the third switch K3 is connected to the second end of the second secondary side unit and the third end of the first secondary side unit.

[0097] Optionally, the second switch K2 and the third switch K3 together serve as control switches for the parallel circuit, used to control the formation of the parallel circuit in this invention. When the second switch K2 and the third switch K3 are turned on, the DC converter provided by this invention can form a parallel circuit, thereby outputting a voltage less than a preset threshold to the load.

[0098] In one possible implementation, Figure 8 This is another structural schematic diagram of the DC-DC converter provided in an embodiment of the present invention, referred to... Figure 8 As shown, in Figure 1 Based on this, the DC converter provided by this utility model also includes: a third capacitor C3.

[0099] One end of the third capacitor C3 is connected to one end of the second primary side T2, and the other end of the third capacitor C3 is used to connect to the load.

[0100] Optionally, the third capacitor C3 is used to filter the input voltages of the first and second transformers, thereby improving the stability and safety of the DC converter provided by this invention when outputting voltage to the load.

[0101] Figure 9This is another structural schematic diagram of the DC-DC converter provided in an embodiment of the present invention, referred to... Figure 9 As shown, the DC converter provided by this utility model adopts a two-way rectified output method.

[0102] Among them, path A is the branch where the first capacitor C1 is located, and path B is the branch where the second capacitor C2 is located.

[0103] Optionally, the first primary side T1 and the second primary side T2 are connected in series to achieve current sharing of the rectifier diodes at the output end. The first secondary side L1, the second secondary side L2, the third secondary side L3 and the fourth secondary side L4 are two-way interleaved full-wave rectified outputs, which overcomes the difference in transformer windings and ensures current and voltage sharing of the two outputs in the hardware circuit. Then, the series-parallel switching control of the first switch K1, the second switch K2 and the third switch K3 is connected to the total output port, realizing automatic voltage sharing in both series and parallel relay modes at the output end.

[0104] For example, when the output request voltage received by the control unit is below a preset threshold, the first switch K1 at the output terminal is opened, and the second switch K2 and the third switch K3 are opened, thereby realizing the parallel output of paths A and B after full-wave rectification and interleaving. When the output request voltage received by the control unit is above the preset threshold, the first switch K1 at the output terminal is closed, and the second switch K2 and the third switch K3 are opened, thereby realizing the series output of paths A and B after full-wave rectification and interleaving.

[0105] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A DC-DC converter, characterized in that, include: The first transformer, the second transformer, the first voltage stabilizing unit, the second voltage stabilizing unit, the first switching unit, and the second switching unit; The first transformer includes a first primary side and a first secondary side unit, and the second transformer includes a second primary side and a second secondary side unit; The first primary side is connected in series with the second primary side and is used to connect to the input voltage. The first end of the first secondary side unit is connected to the first input end of the first voltage regulator unit. The second end of the first secondary side unit is connected to the third end of the second secondary side unit, the first end of the first switching unit, and the third end of the second switching unit. The third end of the first secondary side unit is connected to the second end of the second secondary side unit and the fourth end of the second switching unit. The fourth end of the first secondary side unit is connected to the second input end of the first voltage regulator unit. The first output terminal of the first voltage regulator unit is connected to the second output terminal of the second voltage regulator unit and the second terminal of the second switching unit, respectively; the second output terminal of the first voltage regulator unit is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively. The first end of the second secondary side unit is connected to the first input end of the second voltage regulator unit, the second end of the second secondary side unit is connected to the third end of the first secondary side unit and the fourth end of the second switching unit, the third end of the second secondary side unit is connected to the second end of the first secondary side unit, the first end of the first switching unit and the third end of the second switching unit, and the fourth end of the second secondary side unit is connected to the second input end of the second voltage regulator unit. The first output terminal of the second voltage regulator unit is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively; the second terminal and the fourth terminal of the second switching unit are used to connect to the load and output the rectified voltage to the load.

2. The DC-DC converter according to claim 1, characterized in that, Also includes: The first filtering unit and the second filtering unit; The first end of the first filter unit is connected to the first output end of the first voltage regulator unit and the second end of the second switch unit, respectively; the second end of the first filter unit is connected to the second end of the first secondary side unit and the first end of the first switch unit, respectively. The first end of the second filtering unit is connected to the second output end of the first voltage regulator unit, the first output end of the second voltage regulator unit, and the second end of the first switching unit. The second end of the second filtering unit is connected to the third end of the first secondary side unit, the second end of the second secondary side unit, and the fourth end of the second switching unit.

3. The DC-DC converter according to claim 2, characterized in that, The first filtering unit includes a first capacitor, and the second filtering unit includes a second capacitor.

4. The DC-DC converter according to claim 1, characterized in that, The first secondary edge unit includes: a first secondary edge and a second secondary edge; The first end of the first secondary side is connected to the first input terminal of the first voltage regulator unit, and the second end of the first secondary side is connected to the third end of the second secondary side unit, the first end of the first switching unit, and the third end of the second switching unit, respectively. The first end of the second secondary side is connected to the second end of the second secondary side unit and the fourth end of the second switching unit, respectively, and the second end of the second secondary side is connected to the second input end of the first voltage regulator unit.

5. The DC-DC converter according to claim 1, characterized in that, The second secondary edge unit includes: a third secondary edge and a fourth secondary edge; The first end of the third secondary side is connected to the first input end of the second voltage regulator unit, and the second end of the third secondary side is connected to the third end of the first secondary side unit and the fourth end of the second switching unit, respectively. The first end of the fourth secondary side is connected to the second end of the first secondary side unit, the first end of the first switching unit, and the third end of the second switching unit, respectively, and the second end of the fourth secondary side is connected to the second input end of the second voltage regulator unit.

6. The DC-DC converter according to claim 1, characterized in that, The first voltage regulator unit includes: a first rectifier diode and a second rectifier diode; The positive terminal of the first rectifier diode is connected to the first end of the first secondary side unit, and the negative terminal of the first rectifier diode is connected to the second output terminal of the second voltage regulator unit and the second end of the second switching unit, respectively. The positive terminal of the second rectifier diode is connected to the fourth terminal of the first secondary side unit, and the negative terminal of the second rectifier diode is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively.

7. The DC-DC converter according to claim 1, characterized in that, The second voltage regulator unit includes: a third rectifier diode and a fourth rectifier diode; The positive terminal of the third rectifier diode is connected to the first terminal of the second secondary side unit, and the negative terminal of the third rectifier diode is connected to the second terminal of the first switching unit and the first terminal of the second switching unit, respectively. The positive terminal of the fourth rectifier diode is connected to the fourth terminal of the second secondary unit, and the negative terminal of the fourth rectifier diode is connected to the fourth terminal of the second secondary unit.

8. The DC-DC converter according to claim 1, characterized in that, The first switching unit includes: a first switch.

9. The DC-DC converter according to claim 1, characterized in that, The second switching unit includes: a second switch and a third switch; The first end of the second switch is connected to the second output end of the first voltage regulator unit and the second end of the first switch unit, and the second end of the second switch is connected to the first output end of the first voltage regulator unit and the second output end of the second voltage regulator unit. The first end of the third switch is connected to the second end of the first secondary side unit, the third end of the second secondary side unit, and the first end of the first switch unit. The second end of the third switch is connected to the second end of the second secondary side unit and the third end of the first secondary side unit.

10. The DC-DC converter according to claim 1, characterized in that, Also includes: Third capacitor; One end of the third capacitor is connected to one end of the second primary side, and the other end of the third capacitor is used to connect to the load.

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