Wide voltage range direct current output circuit

Abstract

The application relates to the field of electrical components, and discloses a wide-voltage-range direct-current output circuit, a direct-current voltage input module, the direct-current voltage input module is used for inputting a first direct-current voltage to the direct-current output circuit, the voltage range of the first direct-current voltage comprises a first voltage range and a second voltage range, the first direct-current voltage value in the first voltage range is greater than the first direct-current voltage value in the second voltage range; a first inductor and a first switch, the first inductor and the first switch are connected with the direct-current voltage input module respectively, the first switch is opened or closed according to the value of the first direct-current voltage; a first circuit topology and a second circuit topology, the first circuit topology is connected with the first switch, and the second circuit topology is connected with the first inductor; a transformer, the transformer is connected with the first circuit topology and the second circuit topology respectively; and a direct-current voltage output module, the direct-current voltage output module is connected with the transformer. A direct-current output circuit suitable for a wide voltage range is provided.

Description

Technical Field

[0001] This application relates to the field of electrical components, and in particular to DC output circuits with a wide voltage range. Background Technology

[0002] As countries around the world increasingly focus on global climate change, a series of carbon emission plans, such as carbon peaking and carbon neutrality, are being implemented. Photovoltaic energy storage technology has seen unprecedented development. However, existing photovoltaic energy storage technologies suffer from a wide input voltage range due to varying time of day—for example, higher input voltage at midday when solar radiation is stronger, and lower input voltage in the morning or evening when solar radiation is weaker. Existing DC photovoltaic energy storage systems exhibit poor compatibility across this wide voltage range. Utility Model Content

[0003] This application primarily addresses the technical problem of poor compatibility of existing wide-voltage DC photovoltaic energy storage systems across a wide voltage range. It provides a DC output circuit adaptable to a wide voltage range.

[0004] To solve the above-mentioned technical problems, this application provides a DC output circuit with a wide voltage range, characterized in that the DC output circuit with a wide voltage range includes,

[0005] A DC voltage input module is used to input a first DC voltage to a DC output circuit. The voltage range of the first DC voltage includes a first voltage range and a second voltage range. The first DC voltage value in the first voltage range is greater than the first DC voltage value in the second voltage range.

[0006] A first inductor and a first switch are respectively connected to the DC voltage input module. The first switch opens or closes based on the value of the first DC voltage.

[0007] When the DC voltage value of the first DC voltage is within the first voltage range, the first switch is closed, and the first DC voltage is output by the first switch;

[0008] When the DC voltage value of the first DC voltage is within the second voltage range, the first switch is turned off, and the first DC voltage is output by the first inductor;

[0009] A first circuit topology and a second circuit topology, wherein the first circuit topology is connected to the first switch and the second circuit topology is connected to the first inductor;

[0010] A transformer, which is connected to both the first circuit topology and the second circuit topology;

[0011] A DC voltage output module, wherein the DC output voltage module is connected to the transformer.

[0012] In one possible implementation, the wide voltage range DC output circuit further includes,

[0013] A rectifier and filter module is connected to both the transformer and the DC voltage output module.

[0014] In one possible implementation, the first circuit topology includes,

[0015] A first switching transistor and a first capacitor are arranged sequentially along the direction of flow of the first DC current, and the first switching transistor is connected to a first inductor.

[0016] The second inductor connects the first capacitor to the transformer via the second inductor.

[0017] The second capacitor has a first connection point and a second connection point. The first connection point of the second capacitor is connected to the transformer, and the second connection point of the second capacitor is located between the first switch and the DC voltage input module.

[0018] In one possible implementation, the second circuit topology includes the first circuit topology, and the second circuit topology further includes,

[0019] The second switching transistor has a first connection point and a second connection point. The first connection point of the second switching transistor is connected to the connection line between the first switching transistor and the first capacitor, and the second connection point of the second switching transistor is connected to the connection line between the transformer and the second capacitor.

[0020] In one possible implementation, the wide voltage range DC output circuit further includes,

[0021] An active clamping circuit is connected to the second circuit topology and the first inductor, respectively.

[0022] In one embodiment, the active clamping circuit includes a first connection point and a second connection point. The first connection point of the active clamping circuit is connected to the connection line between the second capacitor and the second switching transistor, and the second connection point of the active clamping circuit is connected to the connection line between the first inductor and the first switching transistor.

[0023] In one possible implementation, the active clamping circuit includes,

[0024] A third switch and a third capacitor are connected in sequence. The third switch is located near the first connection point of the active clamping circuit, and the third capacitor is located near the second connection point of the active clamping circuit.

[0025] In one possible implementation, the wide voltage range DC output circuit further includes,

[0026] A grounding line is provided, which is connected to the connection line between the second capacitor and the transformer.

[0027] In one possible implementation, the transformer includes,

[0028] The primary winding and the secondary winding are electrically isolated from each other by magnetic coupling. The primary winding is connected to the second inductor and the second capacitor, and the secondary winding is connected to the rectifier and filter module.

[0029] In one possible implementation, the first voltage range is 100V to 200V, and the second voltage range is 50V to 100V.

[0030] Compared to existing technologies, the first DC voltage of this application is input to the DC output circuit through a DC voltage input module. When the input first DC voltage is within a first voltage range, the first switch is closed, the first inductor is simultaneously bypassed, and the first DC voltage flows through the first switch. Then, the first DC voltage is supplied to the transformer via a first circuit topology, and finally output by the DC voltage output module to achieve a regulated output of the first DC voltage. When the input first DC voltage is within a second voltage range, the first switch is open, the first DC voltage flows through the first inductor to achieve a boost voltage, then the first DC voltage is input to the transformer via a second circuit topology, and finally output by the DC voltage output module. These two first DC voltage transmission modes further improve the ability of the DC output circuit of this application to handle a wide voltage range. Attached Figure Description

[0031] Appendix Figure 1 This is a block diagram of the DC circuit with a wide voltage range according to this application;

[0032] Appendix Figure 2 This is a circuit diagram of the DC circuit with a wide voltage range according to this application.

[0033] Explanation of the labels in the diagram:

[0034] 10. Wide voltage range DC output circuit;

[0035] 100. DC voltage input module;

[0036] 200. First inductor;

[0037] 300. First switch;

[0038] 400. First circuit topology; 410. First switching transistor; 420. First capacitor; 430. Second capacitor; 440. Second inductor;

[0039] 500. Second circuit topology; 510. Second switching transistor;

[0040] 600. Transformer; 610. Primary winding; 620. Secondary winding;

[0041] 700. Rectifier and filter module;

[0042] 800, DC voltage output module;

[0043] 900, Active clamping circuit; 910, Third switching transistor; 920, Third capacitor. Detailed Implementation

[0044] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] Existing DC photovoltaic energy storage systems suffer from poor compatibility across a wide voltage range.

[0046] Therefore, this application provides a DC output circuit with a wide voltage range, wherein the DC output circuit with a wide voltage range includes,

[0047] A DC voltage input module is used to input a first DC voltage to a DC output circuit. The voltage range of the DC voltage includes a first voltage range and a second voltage range. The first DC voltage value in the first voltage range is greater than the first DC voltage value in the second voltage range.

[0048] A first inductor and a first switch are respectively connected to the DC voltage input module. The first switch opens or closes based on the value of the first DC voltage.

[0049] When the DC voltage value of the first DC voltage is within the first voltage range, the first switch is closed, and the first DC voltage is output by the first switch;

[0050] When the DC voltage value of the first DC voltage is within the second voltage range, the first switch is turned off, and the first DC voltage is output by the first inductor;

[0051] A first circuit topology and a second circuit topology, wherein the first circuit topology is connected to the first switch and the second circuit topology is connected to the first inductor;

[0052] A transformer, which is connected to both the first circuit topology and the second circuit topology;

[0053] A DC voltage output module, wherein the DC output voltage module is connected to the transformer.

[0054] Example 1:

[0055] Photovoltaic energy storage is a technology that stores the electrical energy generated by a photovoltaic (PV) power generation system for further utilization. The power output of a PV system depends on the intensity of solar radiation; the stronger the solar radiation, the more energy the PV cells receive, and the higher the power output. Therefore, PV systems are more suitable for installation in areas with abundant sunlight. However, even with abundant sunlight, power output varies at different times of day. Specifically, solar radiation is stronger at midday, resulting in more energy received by the PV cells, while weaker solar radiation in the morning or evening leads to less energy received. Existing PV systems are typically used in conjunction with DC output voltage. The PV system inputs DC voltage into a DC output circuit, which then stabilizes the DC voltage for output. However, due to the time of day, existing PV systems have a wide range of DC voltage inputs to the output circuit. This wide range of DC voltages presents a compatibility issue, meaning that existing DC output circuits cannot simultaneously handle both high and low voltage ranges of DC voltage.

[0056] Appendix Figure 1 This is a block diagram of the DC circuit with a wide voltage range according to this application. Please refer to the attached diagram. Figure 1 As shown, the wide voltage range DC output circuit 10 of this application includes a DC voltage input module 100. The DC voltage input module 100 is connected to the photovoltaic power generation system and is used to input the first DC voltage generated by the photovoltaic power generation system into the DC output circuit. Furthermore, the voltage range of the first DC voltage includes a first voltage range and a second voltage range. The first DC voltage value in the first voltage range is greater than the first DC voltage value in the second voltage range. That is, any first DC voltage value within the first voltage range is greater than any first DC voltage value within the second voltage range, so that the subsequent wide voltage range DC output circuit 10 processes the first DC voltage according to the first voltage range and the second voltage range.

[0057] In one implementation, the first voltage range is 100V to 200V. The second voltage range is 50V to 100V.

[0058] Please refer to the attached document. Figure 1 As shown, the wide voltage range DC output circuit 10 of this application further includes a first inductor 200 and a first switch 300. The first inductor 200 and the first switch 300 are respectively connected to the DC voltage input module 100, that is, the first switch 300 and the first inductor 200 are connected in parallel. The first DC voltage is selectively directed to either the first switch 300 or the first inductor 200. In specific applications, when the first switch 300 is open, the first DC voltage flows to the first inductor 200. When the first switch 300 is closed, the first DC voltage flows to the first switch 300, and the first inductor 200 is bypassed. The first switch 300 is opened or closed according to the value of the first DC voltage. When the first DC voltage value is within the first voltage range, the first switch 300 is closed, and the first DC voltage is output by the first switch 300. When the first DC voltage value is within the second voltage range, the first switch 300 is open, and the first DC voltage flows through the first inductor 200 to achieve voltage boost.

[0059] Please refer to the attached document. Figure 1 As shown, the DC output circuit 10 with a wide voltage range of this application also includes a first circuit topology 400 and a second circuit topology 500. The first circuit topology 400 is connected to the first switch 300 to receive the first DC voltage from the first switch 300, and the second circuit topology 500 is connected to the first inductor 200 to receive the first DC voltage from the first inductor 200.

[0060] Please refer to the attached document. Figure 1 As shown, the DC output circuit 10 with a wide voltage range of this application also includes a transformer 600 and a DC voltage output module 800. The transformer 600 is connected to the first circuit topology 400 and the second circuit topology 500 respectively to receive the first DC voltage from the first circuit topology 400 and the second circuit topology 500, and achieves regulated output after adjustment by the transformer 600.

[0061] Please refer to the attached document. Figure 1As shown, the wide voltage range DC output circuit 10 of this application also includes a rectifier and filter module 700 and a DC voltage output module 800. The rectifier and filter module 700 is connected to the transformer 600 and the DC voltage output module 800, respectively. The rectifier and filter module 700 is used to receive the first DC voltage from the transformer 600 and to smooth the first DC voltage. The filter unit in the rectifier and filter module 700 is generally composed of energy storage components such as capacitors and inductors. By utilizing the charging and discharging characteristics of capacitors and the current-resisting characteristics of inductors, the AC components in the first DC voltage are filtered out, making the output first DC voltage smoother and more stable to meet the power supply stability requirements of electronic devices.

[0062] Please refer to the attached document. Figure 1 As shown, the DC output circuit 10 with a wide voltage range of this application also includes an active clamping circuit 900. The active clamping circuit 900 is connected to the second circuit topology 500 and the first inductor 200 respectively. The active clamping circuit 900 is used to limit voltage spikes when the switch is open, thereby realizing protection of the circuit when it is disconnected.

[0063] Appendix Figure 2 This is a circuit diagram of the DC circuit with a wide voltage range according to this application. Please refer to the attached diagram. Figure 2 As shown, the first circuit topology 400 includes a first switching transistor 410 and a first capacitor 420. The first switching transistor 410 and the first capacitor 420 are arranged sequentially along the flow direction of the first DC current. The first switching transistor 410 is connected to the first inductor 200.

[0064] The first circuit topology 400 also includes a second inductor 440, and the first capacitor 420 is connected to the transformer 600 through the second inductor 440.

[0065] The first circuit topology 400 also includes a second capacitor 430, which has a first connection point and a second connection point. The first connection point of the second capacitor 430 is connected to the transformer 600, and the second connection point of the second capacitor 430 is located between the first switch 300 and the DC voltage input module 100.

[0066] Please refer to the attached document. Figure 2 As shown, the second circuit topology 500 includes all the components in the first circuit topology 400. The second circuit topology 500 also includes a second switch 510. The second switch 510 has a first connection point and a second connection point. The first connection point of the second switch 510 is connected to the connection line between the first switch 410 and the first capacitor 420. The second connection point of the second switch 510 is connected to the connection line between the transformer 600 and the second capacitor 430.

[0067] Reference Appendix Figure 2The active clamping circuit 900 shown includes a first connection point and a second connection point. The first connection point of the active clamping circuit 900 is connected to the connection line between the second capacitor 430 and the second switching transistor 510, and the second connection point of the active clamping circuit 900 is connected to the connection line between the first inductor 200 and the first switching transistor 410.

[0068] Furthermore, the active clamping circuit 900 includes a third switch 910 and a third capacitor 920, the third switch 910 and the third capacitor 920 being connected in sequence, the third switch 910 being disposed near the first connection point of the active clamping circuit 900, and the third capacitor 920 being disposed near the second connection point of the active clamping circuit 900.

[0069] Please refer to the attached document. Figure 2 As shown, the wide voltage range DC output circuit 10 also includes a grounding line, which is connected to the connection line between the second capacitor 430 and the transformer 600.

[0070] Please refer to the attached document. Figure 2 The transformer 600 shown includes a primary winding 610 and a secondary winding 620. The primary winding 610 is electrically isolated from the secondary winding 620 by magnetic coupling. The primary winding 610 is connected to the second inductor 440 and the second capacitor 430, and the secondary winding 620 is connected to the rectifier and filter module 700.

[0071] In practical use, when the first DC voltage is within the first voltage range, the first DC voltage is input by the DC voltage input module 100. The first switch 300 is closed and the first inductor 200 is bypassed. The first DC voltage is delivered from the first switch 300 to the first switching transistor 410. At this time, the first switching transistor 410 is in the conducting state, while the second switching transistor 510 and the third switching transistor 910 are in the cut-off state. Then, the first DC voltage passes through the first capacitor 420, the second inductor 440, the primary winding 610, and the second capacitor 430 in sequence to form a circuit and cause the primary winding 610 to generate a magnetic field. At the same time, the secondary winding 620 generates an induced electromotive force, thereby generating a current in the secondary winding 620 to further realize the transfer of the first DC voltage from the primary winding 610 to the secondary winding 620. Finally, the first DC voltage is output by the DC voltage output module 800 after passing through the rectifier and filter module 700.

[0072] When the first DC voltage is within the second voltage range, the first DC voltage is input by the DC voltage input module 100, the first switch 300 is turned off, and the first DC voltage is supplied from the first inductor 200 to the first switch transistor 410. At this time, the first switch transistor 410 and the second switch transistor 510 are in the on state, and the third switch transistor 910 is in the off state. Then the first DC voltage passes through the second switch transistor 510 and the second capacitor 430 in sequence to form a circuit, thereby causing the first inductor 200 to work and realize the boost of the first DC voltage. Further, the second switch transistor 510 switches from the on state to the off state. At this time, the active clamping circuit 900 works to limit voltage spikes. At this time, the first DC voltage starts from the first inductor 200 and passes through the first capacitor 420, the second inductor 440, the primary winding 610 and the second capacitor 430 in sequence to form a circuit. This causes the primary winding 610 to generate a magnetic field, and the secondary winding 620 to generate an induced electromotive force, thereby generating a current in the secondary winding 620. This further realizes the transfer of the first DC voltage from the primary winding 610 to the secondary winding 620. Finally, the first DC voltage is output by the DC voltage output module 800 after passing through the rectifier and filter module 700.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0075] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A DC output circuit with a wide voltage range, characterized in that, The wide voltage range DC output circuit includes, A DC voltage input module is used to input a first DC voltage to a DC output circuit. The voltage range of the first DC voltage includes a first voltage range and a second voltage range. The first DC voltage value in the first voltage range is greater than the first DC voltage value in the second voltage range. A first inductor and a first switch are respectively connected to the DC voltage input module. The first switch opens or closes based on the value of the first DC voltage. When the DC voltage value of the first DC voltage is within the first voltage range, the first switch is closed, and the first DC voltage is output by the first switch; When the DC voltage value of the first DC voltage is within the second voltage range, the first switch is turned off, and the first DC voltage is output by the first inductor; A first circuit topology and a second circuit topology, wherein the first circuit topology is connected to the first switch and the second circuit topology is connected to the first inductor; A transformer, which is connected to both the first circuit topology and the second circuit topology; A DC voltage output module, wherein the DC output voltage module is connected to the transformer.

2. The wide voltage range DC output circuit according to claim 1, characterized in that, The wide voltage range DC output circuit also includes, A rectifier and filter module is connected to both the transformer and the DC voltage output module.

3. The wide voltage range DC output circuit according to claim 2, characterized in that, The first circuit topology includes, A first switching transistor and a first capacitor are arranged sequentially along the direction of flow of the first DC current, and the first switching transistor is connected to a first inductor. The second inductor connects the first capacitor to the transformer via the second inductor. The second capacitor has a first connection point and a second connection point. The first connection point of the second capacitor is connected to the transformer, and the second connection point of the second capacitor is located between the first switch and the DC voltage input module.

4. The wide voltage range DC output circuit according to claim 3, characterized in that, The second circuit topology includes the first circuit topology, and the second circuit topology also includes, The second switching transistor has a first connection point and a second connection point. The first connection point of the second switching transistor is connected to the connection line between the first switching transistor and the first capacitor, and the second connection point of the second switching transistor is connected to the connection line between the transformer and the second capacitor.

5. The wide voltage range DC output circuit according to claim 4, characterized in that, The wide voltage range DC output circuit also includes, An active clamping circuit is connected to the second circuit topology and the first inductor, respectively.

6. The wide voltage range DC output circuit according to claim 5, characterized in that, The active clamping circuit includes a first connection point and a second connection point. The first connection point of the active clamping circuit is connected to the connection line between the second capacitor and the second switching transistor, and the second connection point of the active clamping circuit is connected to the connection line between the first inductor and the first switching transistor.

7. The wide voltage range DC output circuit according to claim 6, characterized in that, The active clamping circuit includes, A third switch and a third capacitor are connected in sequence. The third switch is located near the first connection point of the active clamping circuit, and the third capacitor is located near the second connection point of the active clamping circuit.

8. The wide voltage range DC output circuit according to claim 5, 6, or 7, characterized in that, The wide voltage range DC output circuit also includes, A grounding line is provided, which is connected to the connection line between the second capacitor and the transformer.

9. The wide voltage range DC output circuit according to claim 5, 6, or 7, characterized in that, The transformer includes, The primary winding and the secondary winding are electrically isolated from each other by magnetic coupling. The primary winding is connected to the second inductor and the second capacitor, and the secondary winding is connected to the rectifier and filter module.

10. The wide voltage range DC output circuit according to claim 1, characterized in that, The first voltage range is 100V to 200V, and the second voltage range is 50V to 100V.

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