Photovoltaic charging device

Abstract

The application relates to a photovoltaic charging device in the technical field of charging control. The photovoltaic charging device comprises a photovoltaic assembly, a maximum power point tracking control unit, a voltage stabilizing circuit and a charging interface. The photovoltaic assembly is used for converting solar energy into electric energy. An output end of the photovoltaic assembly is electrically connected with an input end of the maximum power point tracking control unit. An output end of the maximum power point tracking control unit is electrically connected with an input end of the voltage stabilizing circuit. An output end of the voltage stabilizing circuit is electrically connected with the charging interface. The charging interface is used for electrically connecting a device to be charged. In this way, the photovoltaic charging device converts solar energy into electric energy and directly supplies power to the device to be charged, without a storage battery, thereby avoiding the related disadvantages of charging the storage battery, completely eliminating the safety risks such as liquid leakage and explosion, and having the remarkable advantages of sustainable power supply, simple maintenance, controllable long-term cost, excellent safety performance and the like, and being capable of meeting the outdoor flexible and convenient welding requirements.

Description

Technical Field

[0001] This application relates to the field of charging control technology, and in particular to a photovoltaic charging device. Background Technology

[0002] In outdoor work scenarios far from the mains power grid, traditional welding operations heavily rely on batteries as their power source. However, the inherent limitations of batteries significantly restrict their application efficiency, with the following drawbacks:

[0003] (1) The battery has limited power reserves and requires a long charging process before each use. Moreover, the welding task will be halted once the battery is depleted during use.

[0004] (2) Batteries have self-discharge characteristics. Even when idle, the battery's power is constantly lost, and the actual usable power is greatly reduced.

[0005] (3) The weight of the battery is large, which makes outdoor transportation and operation very inconvenient and adds extra workload.

[0006] (4) The lifespan of a storage battery is usually only 2 to 5 years, and it needs to be replaced when it expires. Moreover, during use, it is necessary to perform maintenance work such as checking the electrolyte level, adding distilled water, and performing equalization charging regularly, which results in high maintenance costs.

[0007] (5) The storage battery has safety hazards such as leakage and explosion, which constantly threaten the personal safety of the workers and the integrity of the equipment. Utility Model Content

[0008] To address the aforementioned technical problems, this application provides a photovoltaic charging device.

[0009] This application provides a photovoltaic charging device, including: a photovoltaic module, a maximum power point tracking control unit, a voltage regulator circuit, and a charging interface;

[0010] The photovoltaic module is used to convert solar energy into electrical energy. The output terminal of the photovoltaic module is electrically connected to the input terminal of the maximum power point tracking control unit. The output terminal of the maximum power point tracking control unit is electrically connected to the input terminal of the voltage regulator circuit. The output terminal of the voltage regulator circuit is electrically connected to the charging interface, which is used to electrically connect to the device to be charged.

[0011] Optionally, the maximum power point tracking control unit includes a microcontroller, a current acquisition unit, a voltage acquisition unit, and a voltage conversion module;

[0012] The output terminal of the photovoltaic module is electrically connected to the current collector, the voltage collector, and the voltage conversion module, respectively. The current collector and the voltage collector are both electrically connected to the input terminal of the microcontroller. The output terminal of the microcontroller is electrically connected to the voltage conversion module. The voltage conversion module is electrically connected to the input terminal of the voltage regulator circuit.

[0013] Optionally, the voltage regulator circuit includes a switching regulator chip;

[0014] The first terminal of the switching regulator chip is connected to the output terminal of the maximum power point tracking control unit, the second terminal of the switching regulator chip is electrically connected to the charging interface, and the third terminal of the switching regulator chip is grounded.

[0015] Optionally, the photovoltaic charging device further includes: a filter circuit;

[0016] The input terminal of the filter circuit is electrically connected to the output terminal of the voltage regulator circuit, and the output terminal of the filter circuit is electrically connected to the charging interface.

[0017] Optionally, the photovoltaic charging device further includes a protection circuit; the protection circuit is used to disconnect the electrical connection between the photovoltaic charging device and the device to be charged based on the occurrence of overvoltage or overcurrent in the photovoltaic charging device.

[0018] Optionally, the protection circuit includes a voltage comparator, a selector, and a voltage divider resistor;

[0019] The first input terminal of the voltage comparator is used to connect to the reference voltage. The second input terminal of the voltage comparator is electrically connected to the first terminal of the voltage divider resistor, and the second terminal of the voltage divider resistor is grounded. The output terminal of the voltage comparator is electrically connected to the control terminal of the selector. The first terminal of the selector is electrically connected to the charging interface, and the second terminal of the selector is electrically connected to the first terminal of the voltage divider resistor.

[0020] Optionally, the protection circuit may further include a directional diode.

[0021] Optionally, the photovoltaic charging device further includes an alarm device; the alarm device is used to indicate overvoltage faults and / or overcurrent faults.

[0022] Optionally, the alarm device includes indicator lights and / or a buzzer.

[0023] Optionally, the charging interface includes a power socket that matches the power plug of the device to be charged.

[0024] The technical solution provided in this application has the following advantages compared with the prior art:

[0025] The photovoltaic charging device provided in this application includes a photovoltaic module, a maximum power point tracking control unit, a voltage regulator circuit, and a charging interface. The photovoltaic module converts solar energy into electrical energy. The output terminal of the photovoltaic module is electrically connected to the input terminal of the maximum power point tracking control unit. The output terminal of the maximum power point tracking control unit is electrically connected to the input terminal of the voltage regulator circuit. The output terminal of the voltage regulator circuit is electrically connected to the charging interface, which is used to electrically connect to the device to be charged. With this configuration, the photovoltaic charging device converts solar energy into electrical energy, directly powering the device to be charged without the need for a battery. This avoids the drawbacks associated with batteries and completely eliminates safety risks such as leakage and explosion. It has significant advantages such as sustainable power supply, easy maintenance, controllable long-term costs, and excellent safety performance, and can meet the flexible and convenient welding needs of outdoor applications. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a photovoltaic charging device provided in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of another photovoltaic charging device provided in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the structure of another photovoltaic charging device provided in the embodiments of this application;

[0031] Figure 4 This is a schematic diagram of the structure of another photovoltaic charging device provided in the embodiments of this application;

[0032] Figure 5 This is a schematic diagram of the structure of another photovoltaic charging device provided in the embodiments of this application;

[0033] Figure 6 This is a schematic diagram of the structure of another photovoltaic charging device provided in the embodiments of this application;

[0034] Figure 7 This is a schematic diagram of the structure of another photovoltaic charging device provided in the embodiments of this application;

[0035] Figure 8This is a schematic diagram of the structure of another photovoltaic charging device provided in the embodiments of this application;

[0036] Figure 9 This is a schematic diagram of another photovoltaic charging device provided in the embodiments of this application. Detailed Implementation

[0037] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0039] The photovoltaic charging device provided in the embodiments of this application will be described exemplarily below with reference to the accompanying drawings.

[0040] In some embodiments, such as Figure 1 As shown, the photovoltaic charging device 100 includes: a photovoltaic module 1, a maximum power point tracking control unit (MPPT) 2, a voltage regulator circuit 3, and a charging interface 4.

[0041] The output terminal of the photovoltaic module 1 is electrically connected to the input terminal of the MPPT control unit 2, the output terminal of the MPPT control unit 2 is electrically connected to the input terminal of the voltage regulator circuit 3, and the output terminal of the voltage regulator circuit 3 is electrically connected to the charging interface 4.

[0042] Photovoltaic module 1 is used to convert solar energy into electrical energy. Using clean energy—solar energy—avoids the problems of limited battery power and inconvenient charging, and is sustainable.

[0043] The MPPT control unit 2 monitors the output voltage and current of the photovoltaic module 1 in real time. Using algorithms such as perturbation observation, incremental conductance, or constant voltage tracking, it adjusts the output impedance of the photovoltaic module 1 to ensure it always operates at its maximum power point, maximizing solar energy utilization. The MPPT control unit 2 precisely regulates the output current and voltage of the photovoltaic module 1, ensuring stable power output from the photovoltaic charging device 100 that meets the operating requirements of the device 200 being charged, thereby directly driving the device 200 to operate efficiently.

[0044] The voltage regulator circuit 3 is used to convert the unstable DC voltage output by the photovoltaic module 1 into a stable DC voltage. For example, the output voltage of the photovoltaic module 1 is in the range of 36V to 40V. After being processed by the voltage regulator circuit 3, the output voltage is stabilized at 36V±0.5V, which meets the working requirements of the device to be charged.

[0045] Charging interface 4 is used for electrical connection to the device 200 to be charged. Charging interface 4 is directly connected to the device 200 to be charged, eliminating the intermediate energy storage link of the battery. The photovoltaic charging device 100 directly supplies power to the device 200 to be charged, which greatly simplifies the power supply process and improves energy utilization efficiency.

[0046] The embodiments of this application do not limit the charging device 200, including all types of charging devices known to those skilled in the art.

[0047] For example, the device to be charged is a diode welding tool. The photovoltaic charging device provided in this application is used to charge the diode charging device, eliminating the need for intermediate energy storage welding with a battery. This avoids the drawbacks of battery charging, not only meeting the flexible and convenient welding needs of outdoor applications, but also completely eliminating safety risks such as leakage and explosion. It has significant advantages such as sustainable power supply, simple maintenance, controllable long-term costs, and excellent safety performance, and can perfectly meet the complex and ever-changing welding operation needs of outdoor applications.

[0048] The photovoltaic charging device provided in this application includes: a photovoltaic module 1, an MPPT control unit 2, a voltage regulator circuit 3, and a charging interface 4. The photovoltaic module 1 converts solar energy into electrical energy. The output terminal of the photovoltaic module 1 is electrically connected to the input terminal of the MPPT control unit 2. The output terminal of the MPPT control unit 2 is electrically connected to the input terminal of the voltage regulator circuit 3. The output terminal of the voltage regulator circuit 3 is electrically connected to the charging interface 4, which is used to electrically connect to the device 200 to be charged. With this configuration, the photovoltaic charging device 100 converts solar energy into electrical energy, directly powering the device to be charged without the need for a battery. This avoids the drawbacks associated with batteries and completely eliminates safety risks such as leakage and explosion. It has significant advantages such as sustainable power supply, easy maintenance, controllable long-term costs, and excellent safety performance, and can meet the flexible and convenient welding needs of outdoor applications.

[0049] In some embodiments, such as Figure 2 As shown, the MPPT control unit 2 includes a microcontroller 21, a current acquisition unit 23, a voltage acquisition unit 22, and a voltage conversion module 24.

[0050] The output terminal of the photovoltaic module 1 is electrically connected to the current collector 23, the voltage collector 22 and the voltage conversion module 24 respectively. The current collector 23 and the voltage collector 22 are both electrically connected to the input terminal of the microcontroller 21. The output terminal of the microcontroller 21 is electrically connected to the voltage conversion module 24. The voltage conversion module 24 is electrically connected to the input terminal of the voltage regulator circuit 3.

[0051] In this embodiment, voltage collector 22 is used to collect the output voltage of photovoltaic module 1, and current collector 23 is used to collect the output current of photovoltaic module 1.

[0052] The voltage conversion module 24 includes a DC / DC conversion module that converts the unstable DC voltage output by the photovoltaic module 1 into a stable DC voltage.

[0053] The microcontroller 21 is used to store and run the MPPT algorithm program. Its working principle is as follows: based on the changes in the output voltage and current of the photovoltaic module 1, the duty cycle of the pulse width modulation (PWM) drive signal of the voltage conversion module 24 is adjusted.

[0054] In some embodiments, such as Figure 3 As shown, the voltage regulator circuit 3 includes a switching voltage regulator chip 31; the first terminal a of the switching voltage regulator chip 31 is connected to the output terminal of the MPPT control unit 2, the second terminal b of the switching voltage regulator chip 31 is electrically connected to the charging interface 4, and the third terminal c of the switching voltage regulator chip 31 is grounded.

[0055] The voltage regulator circuit 3 includes a switching regulator chip 31. The voltage input to the first terminal a of the switching regulator chip 31 varies, while the voltage output from the second terminal b is constant.

[0056] In this embodiment, the voltage regulator circuit 3, composed of the switching voltage regulator chip 31, accurately stabilizes the unstable DC voltage output by the photovoltaic module 1 within the range of 36V±0.5V, meeting the working requirements of the device to be charged 200.

[0057] In some embodiments, such as Figure 4 As shown, the photovoltaic charging device 100 also includes a filter circuit 5; the input terminal of the filter circuit 5 is electrically connected to the output terminal of the voltage regulator circuit 3, and the output terminal of the filter circuit 5 is electrically connected to the charging interface 4.

[0058] In this embodiment, the filter circuit 5 is connected after the voltage regulator circuit 3 to filter out high-frequency noise and low-frequency ripple, making the output voltage of the photovoltaic charging device 100 smoother and more stable.

[0059] This application includes, but is not limited to, capacitor filter circuits, inductor filter circuits, resistor-capacitor (RC) filter circuits, inductor-capacitor (LC) filter circuits, and resistor-capacitor-inductor (RCL) filter circuits for the filter circuit 5, as well as all filter circuits known to those skilled in the art, which are not limited herein.

[0060] In some embodiments, such as Figure 5 or Figure 6 As shown, the photovoltaic charging device 100 also includes a protection circuit 6; the protection circuit 6 is used to disconnect the electrical connection between the photovoltaic charging device 100 and the device to be charged 200 based on the occurrence of overvoltage or overcurrent in the photovoltaic charging device 100.

[0061] In this embodiment, when the output voltage of the photovoltaic charging device 100 exceeds the set value, or the current exceeds the rated current of the device to be charged 200, the protection circuit quickly disconnects the electrical connection between the photovoltaic charging device 100 and the device to be charged 200 to prevent damage to the device to be charged 200 and other components.

[0062] In some embodiments, such as Figure 7 As shown, in this photovoltaic charging device 100, the protection circuit includes a voltage comparator 61, a selector 62, and a voltage divider resistor 63.

[0063] The first input terminal of the voltage comparator 61 is used to connect to the reference voltage V. ref The second input terminal e of the voltage comparator is electrically connected to the first terminal i of the voltage divider resistor 63, the second terminal j of the voltage divider resistor 63 is grounded, the output terminal f of the voltage comparator 61 is electrically connected to the control terminal k of the selector 62, the first terminal g of the selector 62 is electrically connected to the charging interface, and the second terminal h of the selector 62 is electrically connected to the first terminal i of the voltage divider resistor 63.

[0064] In this embodiment, the voltage divider resistor 63 is connected in series with the device to be charged 200, and the selector 62 is located between the voltage divider resistor 63 and the device to be charged 200. Under normal circumstances, the voltage V... in Less than the reference voltage V ref The output terminal f of voltage comparator 61 outputs a first voltage signal, controlling selector 62 to be in the conducting state; when an overcurrent or overvoltage fault occurs, the current flowing through voltage divider resistor 63 is too large, and the voltage V at the first terminal i of voltage divider resistor 63... in The voltage V increases rapidly. in Greater than the reference voltage V ref The output terminal f of the voltage comparator 61 outputs a second voltage signal, which controls the selector 62 to be in the off state, disconnecting the electrical connection between the device to be charged 200 and the voltage divider resistor 63 (i.e., the photovoltaic charging device 100), and preventing damage to the device to be charged 200 and other components.

[0065] In some embodiments, such as Figure 8 As shown, in this photovoltaic charging device 100, the protection circuit also includes a reverse diode.

[0066] In this embodiment, the charging interface 4 includes a positive interface 41 and a negative interface 42. The positive interface 41 is electrically connected to the positive terminal of the device to be charged 200, and the negative interface 42 is electrically connected to the negative terminal of the device to be charged 200.

[0067] The reverse diode 64 exhibits superior reverse conductivity compared to its forward conductivity. Specifically, under forward voltage, the tunneling current I of the reverse diode 64 is very small, but under reverse voltage, the tunneling current increases rapidly. This characteristic of the reverse diode 64 is used to prevent the device to be charged 200 from being connected to the charging interface 4 in reverse.

[0068] In some embodiments, the photovoltaic charging device further includes an alarm device for indicating overvoltage and / or overcurrent faults.

[0069] In this embodiment, when an overcurrent or overvoltage fault occurs in the output circuit of the photovoltaic charging device, an alarm device is triggered to alert the user.

[0070] In some embodiments, the alarm device includes an indicator light and / or a buzzer.

[0071] In this embodiment, the alarm device may also include other alarm devices known to those skilled in the art, such as a display screen for displaying reminder text; or a vibrator for reminding the user by vibration, which is not limited here.

[0072] In some embodiments, the charging interface includes a power socket that matches the power plug of the device to be charged.

[0073] With this setup, the connection between the device to be charged 200 and the photovoltaic charging device 100 is stable and reliable.

[0074] For example, the device to be charged is a diode welding device, which is connected to a power source via a power plug. The charging interface of the photovoltaic charging device is set as a power socket, which is matched with the power plug of the diode welding device. After the power plug of the diode welding device is inserted into the power socket, the diode welding device is electrically connected to the photovoltaic charging device, and the photovoltaic charging device charges the diode welding device.

[0075] For example, such as Figure 9 As shown, the photovoltaic charging device includes: a photovoltaic module 1, an MPPT control unit, a voltage regulator circuit, a filter circuit, a protection circuit, and a charging interface. Figure 9 (Not shown), the final output charging voltage of this photovoltaic charging device is E. dThe microcontroller, current collector, and voltage collector of the MPPT control unit are integrated on photovoltaic module 1, and therefore not located on... Figure 9 The diagram shows the first diode D1, the first capacitor C1, the first inductor L1, and the switching chip V. T The second capacitor C2 constitutes the voltage conversion module of the MPPT control unit, used to convert the unstable DC voltage output by photovoltaic module 1 into a stable DC voltage. The first diode D1 is also used to rectify and filter the current output by photovoltaic module 1. Switching chip V... T It also has a voltage stabilizing function. The first capacitor C1, the first inductor L1, and the second inductor L2 constitute a CL filter circuit to filter out high-frequency noise and low-frequency ripple in the circuit. The second diode D2 is a reverse diode used to prevent reverse connection.

[0076] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0077] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A photovoltaic charging device, characterized in that, include: Photovoltaic modules, maximum power point tracking control unit, voltage regulator circuit and charging interface; The photovoltaic module is used to convert solar energy into electrical energy. The output terminal of the photovoltaic module is electrically connected to the input terminal of the maximum power point tracking control unit. The output terminal of the maximum power point tracking control unit is electrically connected to the input terminal of the voltage regulator circuit. The output terminal of the voltage regulator circuit is electrically connected to the charging interface, which is used to electrically connect to the device to be charged.

2. The photovoltaic charging device according to claim 1, characterized in that, The maximum power point tracking control unit includes a microcontroller, a current acquisition unit, a voltage acquisition unit, and a voltage conversion module; The output terminal of the photovoltaic module is electrically connected to the current collector, the voltage collector, and the voltage conversion module, respectively. The current collector and the voltage collector are both electrically connected to the input terminal of the microcontroller. The output terminal of the microcontroller is electrically connected to the voltage conversion module. The voltage conversion module is electrically connected to the input terminal of the voltage regulator circuit.

3. The photovoltaic charging device according to claim 1, characterized in that, The voltage regulator circuit includes a switching regulator chip; The first terminal of the switching regulator chip is connected to the output terminal of the maximum power point tracking control unit, the second terminal of the switching regulator chip is electrically connected to the charging interface, and the third terminal of the switching regulator chip is grounded.

4. The photovoltaic charging device according to claim 1, characterized in that, Also includes: Filtering circuit; The input terminal of the filter circuit is electrically connected to the output terminal of the voltage regulator circuit, and the output terminal of the filter circuit is electrically connected to the charging interface.

5. The photovoltaic charging device according to claim 1, characterized in that, Also includes: Protection circuit; the protection circuit is used to disconnect the electrical connection between the photovoltaic charging device and the device to be charged based on the occurrence of overvoltage or overcurrent in the photovoltaic charging device.

6. The photovoltaic charging device according to claim 5, characterized in that, The protection circuit includes a voltage comparator, a selector, and a voltage divider resistor; The first input terminal of the voltage comparator is used to connect to the reference voltage. The second input terminal of the voltage comparator is electrically connected to the first terminal of the voltage divider resistor, and the second terminal of the voltage divider resistor is grounded. The output terminal of the voltage comparator is electrically connected to the control terminal of the selector. The first terminal of the selector is electrically connected to the charging interface, and the second terminal of the selector is electrically connected to the first terminal of the voltage divider resistor.

7. The photovoltaic charging device according to claim 5, characterized in that, The protection circuit also includes a reverse diode.

8. The photovoltaic charging device according to claim 5, characterized in that, Also includes: An alarm device; the alarm device is used to indicate overvoltage faults and / or overcurrent faults.

9. The photovoltaic charging device according to claim 8, characterized in that, The alarm device includes indicator lights and / or a buzzer.

10. The photovoltaic charging device according to claim 1, characterized in that, The charging interface includes a power socket that is compatible with the power plug of the device to be charged.

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