A convenient monitoring device for photovoltaic module voltage

Abstract

The utility model belongs to photovoltaic power generation system detection technical field discloses a kind of for the convenient monitoring device of photovoltaic module voltage, including 5V rechargeable lithium battery and photovoltaic panel, 5V rechargeable lithium battery is connected with charging management circuit, charging management circuit is connected with Type-C charging interface, charging management circuit is used for 5V rechargeable lithium battery to carry out charge-discharge management, 5V rechargeable lithium battery is connected with power switch, power switch is connected with voltage detection circuit, photovoltaic panel is connected with special MC4 detection probe, voltage detection circuit input end is connected with special MC4 detection probe, voltage detection circuit is used to receive 0-1000V high voltage direct current signal, voltage detection circuit output end is connected with drive circuit, drive circuit is connected with 3 digit LED display screen, 3 digit LED display screen is used to display the voltage value measured in real time, the open-circuit voltage of photovoltaic module can be measured quickly, safely and reliably by one person.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power generation system testing technology, and in particular to a convenient monitoring device for photovoltaic module voltage. Background Technology

[0002] Currently, during the construction, operation, maintenance, and repair of photovoltaic power plants, it is frequently necessary to measure the open-circuit voltage (Voc) of photovoltaic modules to determine their operating status, verify the number of modules connected in series, or ensure operational safety. A general-purpose digital multimeter (DMM) is typically used for this measurement. The usual method is as follows: the multimeter knob is set to the DC voltage (DCV) range, and two operators work together. One person holds the multimeter and contacts one set of probes, while the other holds the other set of probes and simultaneously contacts the positive and negative MC4 terminals of the photovoltaic module under test to read the voltage value. This method is inconvenient and inefficient: it requires two people to operate, making it impossible for one person to complete the task independently. In large power plants or when a large number of tests are needed, this significantly reduces work efficiency. Furthermore, the multimeter probes are pointed metal probes, which are unstable when inserted into the MC4 terminals, easily slipping, causing poor contact, or even arcing. The two-handed operation also increases the risk of accidentally touching live parts. General-purpose multimeters are complex in function, relatively large in size and weight, and not specifically designed for on-site photovoltaic measurements. Their probes are also unsuitable for direct and reliable connection to standard photovoltaic interfaces. Multimeter ranges must be manually selected; improper selection (such as mistakenly selecting the current or resistance range) may damage the instrument or photovoltaic equipment. Utility Model Content

[0003] The present invention aims to provide a convenient monitoring device for the voltage of photovoltaic modules, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A convenient monitoring device for photovoltaic module voltage includes a 5V rechargeable lithium battery and a photovoltaic panel. The 5V rechargeable lithium battery is connected to a charging management circuit, which is connected to a Type-C charging interface. The charging management circuit manages the charging and discharging of the 5V rechargeable lithium battery. The 5V rechargeable lithium battery is connected to a power switch, which is connected to a voltage detection circuit. The photovoltaic panel is connected to a dedicated MC4 multimeter probe. The input terminal of the voltage detection circuit is connected to the dedicated MC4 multimeter probe. The voltage detection circuit receives high-voltage DC signals from 0-1000V. The output terminal of the voltage detection circuit is connected to a drive circuit, which is connected to a 3-digit LED display screen. The 3-digit LED display screen displays the measured voltage value in real time.

[0006] Preferably, the device includes a housing, and the 5V rechargeable lithium battery, the charging management circuit, the Type-C charging interface, the power switch, the voltage detection circuit, the driving circuit, and the 3-digit LED display screen are respectively connected to the housing.

[0007] Preferably, one end of the dedicated MC4 test probe is connected to the positive and negative terminals of the photovoltaic panel, and the other end of the dedicated MC4 test probe is directly connected to the voltage detection circuit via a wire.

[0008] Preferably, the voltage detection circuit includes a high-precision voltage divider resistor network and a signal conditioning unit, which are used to proportionally attenuate the high voltage to a range that can be safely sampled by the back-end processing unit.

[0009] Preferably, the 5V rechargeable lithium battery is connected to a charging status indicator light.

[0010] The beneficial effects of this technical solution compared to existing technologies are as follows:

[0011] (1) This solution achieves a fast and secure connection with photovoltaic modules through a dedicated MC4 plug, which completely solves the problem of unstable contact of the probes and allows for independent operation by a single person, greatly improving efficiency. The foolproof design (MC4 male and female plugs correspond to the positive and negative poles) fundamentally prevents reverse connection errors. The built-in battery and integrated design make the device small in size and lightweight. It is dedicated to a specific purpose and its portability is far superior to that of a multimeter. Automatic range and direct display avoid the tediousness and errors of manual range selection.

[0012] (2) This solution enables single-person operation and reduces the measurement time from minutes to seconds, making it particularly suitable for rapid troubleshooting of large-scale photovoltaic arrays.

[0013] (3) This solution uses a dedicated interface. The dedicated interface is firmly connected and the foolproof design avoids the risk of short circuit. The high voltage part is encapsulated in an insulating shell. The operator only comes into contact with the insulating joint, which is highly safe.

[0014] (4) This solution has a high degree of equipment integration, small size, light weight, and is easy to carry. It is a professional tool designed for the photovoltaic field and avoids the redundant functions of a multimeter.

[0015] (5) This solution can be tested immediately upon startup, and the results are displayed intuitively. It can be easily operated without professional electrical knowledge, thus lowering the threshold for use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure label:

[0018] 1. 5V rechargeable lithium battery; 2. Charging management circuit; 3. Type-C charging interface; 4. Power switch; 5. Voltage detection circuit; 6. Drive circuit; 7. 3-digit LED display screen; 8. Dedicated MC4 test probes; 9. Photovoltaic panel. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0020] like Figure 1 As shown, this utility model discloses a convenient monitoring device for photovoltaic module voltage, comprising a 5V rechargeable lithium battery 1 and a photovoltaic panel 9. The 5V rechargeable lithium battery 1 is connected to a charging management circuit 2, which is connected to a Type-C charging interface 3. The charging management circuit 2 manages the charging and discharging of the 5V rechargeable lithium battery 1. The 5V rechargeable lithium battery 1 is connected to a power switch 4, which is connected to a voltage detection circuit 5. The power switch 4 controls the power supply to the entire measurement system, completely disconnecting the circuit when not in use to achieve zero power consumption and extend standby time. The photovoltaic panel 9 is connected to a dedicated MC4 test probe 8 via a dedicated MC4 connector. It achieves a fast and secure connection with photovoltaic modules, completely solving the problem of unstable probe contact, and allows for independent operation by a single person, greatly improving efficiency. The input terminal of the voltage detection circuit 5 is connected to the dedicated MC4 test probe 8. The voltage detection circuit 5 is used to receive high-voltage DC signals of 0-1000V. The output terminal of the voltage detection circuit 5 is connected to the drive circuit 6, and the drive circuit 6 is connected to a 3-digit LED display 7. The 3-digit LED display 7 is used to display the measured voltage value in real time. Automatic range and direct display avoid the tediousness and errors of manual range selection. The battery output provides a stable operating power for the 3-digit LED display 7 and the voltage detection circuit 5.

[0021] The device includes a casing, a 5V rechargeable lithium battery 1, a charging management circuit 2, a Type-C charging interface 3, a power switch 4, a voltage detection circuit 5, a drive circuit 6, and a 3-digit LED display 7, all connected to the casing. The built-in battery and integrated design make the device compact, lightweight, and dedicated to its specific purpose, making it far more portable than a multimeter.

[0022] One end of the dedicated MC4 test probe 8 is connected to the positive and negative terminals of the photovoltaic panel 9, replacing the universal multimeter probes. The other end of the dedicated MC4 test probe 8 is directly connected to the voltage detection circuit 5 through a wire. The foolproof design (MC4 male and female connectors correspond to the positive and negative terminals) fundamentally prevents reverse connection errors.

[0023] The voltage detection circuit 5 includes a high-precision voltage divider resistor network and a signal conditioning unit. The high-precision voltage divider resistor network and signal conditioning unit are used to proportionally attenuate the high voltage to a range that the back-end processing unit can safely sample.

[0024] The 5V rechargeable lithium battery 1 is connected to a charging status indicator light, which can show whether the battery is fully charged.

[0025] The specific implementation process is as follows:

[0026] Before use, first ensure that the 5V rechargeable lithium battery 1 is charged (it can be pre-charged via the Type-C interface). Turn the instrument's power switch 4 to the "Off" position, then switch it to the "On" position. At this time, the 3-digit LED display 7 will light up and display the initial value "000" or perform a self-test. Then, the operator holds the tester and plugs the MC4 connector marked "Positive (+)" onto the negative (-) MC4 connector of the photovoltaic panel 9 (the male connector of the photovoltaic panel corresponds to the female connector of the instrument). Similarly, plug the connector marked "Negative (-)" onto the positive (+) connector of the photovoltaic panel. The foolproof design ensures that incorrect connections cannot be made. After successful connection, the open-circuit voltage value of the photovoltaic panel 9 will be immediately and stably displayed on the 3-digit LED display 7. The operator can directly read the value (e.g., "10V"). After measurement, unplug the MC4 connector and switch the power switch 4 to the "Off" position to disconnect the internal circuit power supply and save power for the next use.

[0027] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A convenient monitoring device for photovoltaic module voltage, characterized in that: The system includes a 5V rechargeable lithium battery (1) and a photovoltaic panel (9). The 5V rechargeable lithium battery (1) is connected to a charging management circuit (2). The charging management circuit (2) is connected to a Type-C charging interface (3). The charging management circuit (2) is used to manage the charging and discharging of the 5V rechargeable lithium battery (1). The 5V rechargeable lithium battery (1) is connected to a power switch (4). The power switch (4) is connected to a voltage detection circuit (5). The photovoltaic panel (9) is connected to a dedicated MC4 test probe (8). The input terminal of the voltage detection circuit (5) is connected to the dedicated MC4 test probe (8). The voltage detection circuit (5) is used to receive a high-voltage DC signal of 0-1000V. The output terminal of the voltage detection circuit (5) is connected to a drive circuit (6). The drive circuit (6) is connected to a 3-digit LED display screen (7). The 3-digit LED display screen (7) is used to display the measured voltage value in real time.

2. The convenient monitoring device for photovoltaic module voltage according to claim 1, characterized in that: The 5V rechargeable lithium battery (1), the charging management circuit (2), the Type-C charging interface (3), the power switch (4), the voltage detection circuit (5), the driving circuit (6), and the 3-digit LED display screen (7) are respectively connected to the housing.

3. The convenient monitoring device for photovoltaic module voltage according to claim 1, characterized in that: One end of the dedicated MC4 test probe (8) is connected to the positive and negative terminals of the photovoltaic panel (9), and the other end of the dedicated MC4 test probe (8) is directly connected to the voltage detection circuit (5) through a wire.

4. A convenient monitoring device for photovoltaic module voltage according to claim 1, characterized in that: The voltage detection circuit (5) includes a high-precision voltage divider resistor network and a signal conditioning unit. The high-precision voltage divider resistor network and signal conditioning unit are used to proportionally attenuate the high voltage to a range that the back-end processing unit can safely sample.

5. A convenient monitoring device for photovoltaic module voltage according to claim 1, characterized in that: The 5V rechargeable lithium battery (1) is connected to a charging status indicator light.

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