A voltage measurement device for a photovoltaic module

Abstract

The utility model discloses a voltage measuring device for photovoltaic module, including box body, cross rocker switch, voltage input component and direct current voltmeter, through switching the swing direction of cross rocker handle switch can measure the voltage of positive ground voltage, ground negative voltage, the voltage between positive and negative of component respectively, need not frequently replace test line, operation is more intuitive, simple, need not complex training to be able to quickly get started, reduced the operation difficulty and error rate, can complete the measurement of multiple voltage values in short time.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module testing, specifically to a voltage measuring device for photovoltaic modules. Background Technology

[0002] Currently, photovoltaic (PV) modules (strings) are widely used both domestically and internationally. To ensure the long-term efficient operation of PV systems, it is still necessary to regularly measure voltage to monitor module performance and promptly identify any problems, reducing rework caused by PV module issues. Traditional measurement methods typically involve measurements at the inverter end, and some projects with less favorable conditions even require data from the inverter to determine the PV module's condition, making it difficult to promptly assess whether the modules are damaged on-site. Some construction sites use PV multimeters for measurement, but this requires testers to be familiar with various function keys and operating procedures, frequently changing test leads according to the corresponding measurement parameters. This is cumbersome and time-consuming, and inefficient and ineffective when measuring large-scale PV systems. Utility Model Content

[0003] To solve the aforementioned technical problems, this utility model provides a voltage measuring device for photovoltaic modules, comprising: a housing with an operation panel on its top; a cross rocker switch fixed to the operation panel, wherein normally open contacts K1 and K2 are provided in a first direction, normally open contacts K3 and K4 are provided in a second direction, and normally open contacts K5 and K6 are provided in a third direction; a voltage input component disposed on the operation panel, including a first terminal, a second terminal, and a third terminal for connecting the positive and negative terminals of the photovoltaic module and its housing, respectively; the output of the first terminal is connected in two paths to the input of contacts K1 and K3; the output of the second terminal is connected in two paths to the input of contacts K4 and K6; the output of the third terminal is connected in two paths to the input of contacts K2 and K5; and a DC voltmeter, the positive terminal of which is connected to the output of contacts K1, K3, and K5, and the negative terminal of which is connected to the output of contacts K2, K4, and K6.

[0004] A further technical solution is: one of the four directions, namely the first direction, the second direction, and the third direction, which are different and set in a "+" shape.

[0005] A further technical solution is to set operation labels on the operation panel corresponding to the first direction, the second direction, and the third direction.

[0006] A further technical solution is: a fuse FU1 is connected in series in the circuit where the output end of the first terminal is located, and a fuse FU2 is connected in series in the circuit where the output end of the second terminal is located.

[0007] A further technical solution is that the DC voltmeter is fixedly installed inside the housing, and a transparent window corresponding to the DC voltmeter dial is provided on the operation panel.

[0008] A further technical solution is as follows: The operation panel is provided with a fourth terminal, a fifth terminal, a sixth terminal, and a seventh terminal. The fourth terminal is connected to the output terminals of contacts K1, K3, and K5, and the fifth terminal is connected to the output terminals of contacts K2, K4, and K6. The sixth and seventh terminals are respectively connected to the positive and negative terminals of the DC voltmeter. The fourth terminal is connected to the sixth terminal, and the fifth terminal is connected to the seventh terminal.

[0009] The beneficial effects of this utility model are:

[0010] This utility model's measuring device integrates a cross-shaped rocker switch, terminals, and a DC voltmeter into a single housing. By switching the rocker switch's swing direction, it can measure the positive-to-ground voltage, ground-to-negative voltage, and voltage between positive and negative terminals of the photovoltaic module (string). This eliminates the need for frequent test lead changes, making operation more intuitive and simple. Users can quickly learn to use the device without complex training, reducing operational difficulty and error rates. It can complete the measurement of multiple voltage values ​​in a short time, promptly identifying problems with photovoltaic modules and providing more accurate data support for photovoltaic system performance evaluation and fault diagnosis. It is particularly suitable for rapid testing of large-scale photovoltaic systems. Furthermore, the device provides enhanced overload protection through the inclusion of fuses FU1 and FU2, effectively preventing equipment damage due to overload during measurement, improving equipment reliability and lifespan, and ensuring operator safety. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the photovoltaic module voltage measuring device of this utility model;

[0012] Figure 2 This is a schematic diagram of the photovoltaic module voltage measuring device of this utility model.

[0013] In the picture:

[0014] 1. Box body; 2. Control panel; 3. Cross rocker switch; 4. Handle; 5. First terminal; 6. Second terminal; 7. Third terminal; 8. DC voltmeter; 9. Transparent window; 10. Fourth terminal; 11. Fifth terminal; 12. Sixth terminal; 13. Seventh terminal; 14. Operation markings. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0016] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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.

[0018] The cross rocker switch is a mature product in existing technology. It refers to the fact that when it swings in the four directions of the "+" shape, it can achieve a four-way self-locking function. It is widely used in the field of mechanical control such as motors.

[0019] A typical cross-shaped rocker switch includes a handle, a base, a return spring, and contacts positioned for each direction. When the handle is pushed in a direction (such as "up," "down," "left," or "right"), the internal mechanical structure (such as a spring or conductive rubber) is compressed, contacting the metal contacts in the corresponding direction, thus completing the circuit. Releasing the handle does not disconnect the contacts; to break the circuit, the handle must be manually moved back to the center position.

[0020] This utility model provides a voltage measuring device for photovoltaic modules, such as... Figure 1-2 As shown, it includes a housing 1, a cross-shaped rocker switch 3, a voltage input component, and a DC voltmeter 8.

[0021] An operation panel 2 is provided on the top of the box body 1. In one embodiment, the box body 1 is a fully enclosed, one-piece box body. In another embodiment, the box body 1 is a detachable box body with threaded or snap-fit ​​connections, which facilitates opening for maintenance or replacement of the internal components.

[0022] A cross-shaped rocker switch 3 is fixed to the operation panel 2, with its handle 4 positioned at the top of the operation panel 2 and its base installed inside the housing 1. The cross-shaped rocker switch 3 is a four-way self-locking switch. It has two pairs of normally open contacts K1 and K2 in the first direction, two pairs of normally open contacts K3 and K4 in the second direction, two pairs of normally open contacts K5 and K6 in the third direction, and two pairs of normally open contacts in the fourth direction. When the handle 4 swings in the first direction, contacts K1 and K2 close, and the remaining contacts open; when it swings in the second direction, contacts K3 and K4 close, and the remaining contacts open; when it swings in the third direction, contacts K5 and K6 close, and the remaining contacts open; the normally open contacts in the fourth direction are unused. The first, second, and third directions are all different and are configured as one of the four directions in a cross shape.

[0023] The voltage input component is located on the operation panel 2 and includes a first terminal 5, a second terminal 6, and a third terminal 7 for connecting the positive and negative terminals of the photovoltaic module and its housing, respectively. The output of the first terminal 5 is divided into two branches, which are respectively connected to the input terminals of contacts K1 and K3; the output of the second terminal 6 is divided into two branches, which are respectively connected to the input terminals of contacts K4 and K6; and the output of the third terminal 7 is divided into two branches, which are respectively connected to the input terminals of contacts K2 and K5.

[0024] The positive terminal of the DC voltmeter 8 is connected to the output terminals of contacts K1, K3, and K5, and the negative terminal is connected to the output terminals of contacts K2, K4, and K6.

[0025] Operation labels 14 are provided on the operation panel 2 at positions corresponding to the first, second, and third directions. The operation panel 2 facing the first direction has the text and symbol "Positive to Ground Voltage," the operation panel 2 facing the second direction has the text and symbol "Positive and Negative Voltage," and the operation panel 2 facing the third direction upwards has the text and symbol "Ground to Negative Voltage." The operation labels 14 allow operators to quickly select the measurement type, making operation more convenient, simple, and efficient.

[0026] More preferably, a fuse FU1 is connected in series in the circuit where the output terminal of the first terminal 5 is located, and a fuse FU2 is connected in series in the circuit where the output terminal of the second terminal 6 is located. By setting fuses FU1 and FU2, this device has an overload protection function, which can effectively prevent the equipment from being damaged due to overload during the measurement process.

[0027] The DC voltmeter 8 is fixedly installed inside the housing 1, and the operation panel 2 is provided with a transparent window 9 corresponding to the dial of the DC voltmeter 8. The voltage value at the dial of the DC voltmeter 8 can be easily viewed through the transparent window 9.

[0028] The operation panel 2 is provided with a fourth terminal 10, a fifth terminal 11, a sixth terminal 12, and a seventh terminal 13. The fourth terminal 10 is connected to the output terminals of contacts K1, K3, and K5, and the fifth terminal 11 is connected to the output terminals of contacts K2, K4, and K6. The sixth and seventh terminals 13 are respectively connected to the positive and negative terminals of the DC voltmeter 8. The fourth terminal 10 and the sixth terminal 12 are electrically connected by wires, and the fifth terminal 11 and the seventh terminal 13 are electrically connected by wires.

[0029] How to use the device of this utility model:

[0030] Connect the positive, negative, and outer casing of the photovoltaic module to be measured to the first terminal 5, the second terminal 6, and the third terminal 7, respectively. Guided by the operation indicator 14, swing the crank 4 to the corresponding direction to select the voltage category to be measured. When the crank 4 swings to the corresponding direction, it locks itself and uses its internal contacts to select the corresponding voltage circuit to connect to the DC voltmeter 8. The specific voltage value of the photovoltaic module is displayed on the voltmeter dial, thus completing the voltage measurement of the photovoltaic module. When the crank 4 swings to the first direction and locks itself, close contacts K1 and K2 to measure the voltage value directly to ground. When the crank 4 swings to the second direction and locks itself, close contacts K3 and K4 to measure the positive and negative voltage values ​​of the photovoltaic module. When the crank 4 swings to the third direction and locks itself, close contacts K5 and K6 to measure the voltage value between ground and negative.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A voltage measuring device for photovoltaic modules, characterized in that, include: The box has an operation panel on its top. A cross-shaped rocker switch is fixed to the control panel. The cross-shaped rocker switch has normally open contacts K1 and K2 in the first direction, normally open contacts K3 and K4 in the second direction, and normally open contacts K5 and K6 in the third direction. The voltage input component, located on the operation panel, includes a first terminal, a second terminal, and a third terminal for connecting the positive and negative terminals of the photovoltaic module and its housing, respectively. The output of the first terminal is connected in two paths to the input terminals of contacts K1 and K3; the output of the second terminal is connected in two paths to the input terminals of contacts K4 and K6; and the output of the third terminal is connected in two paths to the input terminals of contacts K2 and K5. The positive terminal of the DC voltmeter is connected to the output terminals of contacts K1, K3, and K5, and the negative terminal is connected to the output terminals of contacts K2, K4, and K6.

2. The photovoltaic module voltage measuring device according to claim 1, characterized in that, The first, second, and third directions are all different and are set as one of the four directions in a "+" shape.

3. The photovoltaic module voltage measuring device according to claim 2, characterized in that, The control panel has operation labels for the first direction, the second direction, and the third direction.

4. The photovoltaic module voltage measuring device according to claim 1, characterized in that, A fuse FU1 is connected in series in the circuit where the output terminal of the first terminal is located, and a fuse FU2 is connected in series in the circuit where the output terminal of the second terminal is located.

5. A photovoltaic module voltage measuring device according to claim 1, characterized in that, The DC voltmeter is fixedly installed inside the housing, and the operation panel has a transparent window corresponding to the DC voltmeter dial.

6. A photovoltaic module voltage measuring device according to claim 5, characterized in that, The operation panel is equipped with a fourth terminal, a fifth terminal, a sixth terminal, and a seventh terminal. The fourth terminal is connected to the output terminals of contacts K1, K3, and K5, and the fifth terminal is connected to the output terminals of contacts K2, K4, and K6. The sixth and seventh terminals are connected to the positive and negative terminals of the DC voltmeter, respectively. The fourth terminal is connected to the sixth terminal, and the fifth terminal is connected to the seventh terminal.

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