Measuring device of photovoltaic module

Abstract

The invention relates to the technical field of photovoltaic measurement, in particular to a photovoltaic module measuring device which comprises a plurality of current sampling circuits which are connected to a photovoltaic panel output circuit and a super-capacitor grounding circuit respectively and used for measuring photovoltaic panel output current and super-capacitor charging current. Wherein each current sampling circuit comprises a selection circuit and a sampling resistor, and the selection circuit is used for switching the sampling resistors with different resistance values according to a preset current threshold value; the current detection circuit is connected with the corresponding current sampling circuit and is used for measuring the output current of the photovoltaic panel or the charging current of the super capacitor; and the main control system is connected with the selection circuit and the current detection circuit, is used for collecting and calculating the current of the photovoltaic panel output line or the current of the super capacitor grounding line, and is used for controlling the selection circuit to select the sampling resistors with different resistance values according to the magnitude of the current. The measuring device has an automatic measuring range switching function, and the testing efficiency and precision are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic measurement. More particularly, the present application relates to a photovoltaic module measurement device. BACKGROUND

[0002] Some products on the market are usually equipped with a photovoltaic panel of several square centimeters in size to achieve low power consumption. The output voltage and current of the photovoltaic panel are relatively low, especially the output current is in the order of uA, and if you want to know its output capacity, you can measure it with some instruments. There are many instruments on the market that can measure current and voltage at the same time, and they can basically only measure current values above mA, and multimeters can measure current values in the order of uA.

[0003] At present, the commonly used current and voltage measuring instruments on the market, such as multimeters, can only measure one electrical parameter at a time and cannot simultaneously measure the input voltage, input current, output voltage and output current in the photovoltaic system. If it is necessary to simultaneously measure the input voltage and input current, the output voltage and output current of the photovoltaic system, multiple multimeters need to be provided, which greatly reduces the test efficiency and is not conducive to manufacturers to carry out production tests. Although there are multi-channel ADC acquisition devices based on STM32, they are only suitable for low-voltage and low-current scenarios and cannot adapt to the measurement requirements of micro-ampere-level current of micro photovoltaic modules, and lack automatic range switching function, with low measurement accuracy and efficiency.

[0004] Therefore, how to solve the problems of low parameter measurement efficiency and poor accuracy of the current small photovoltaic panel is one of the focuses of the current research. SUMMARY

[0005] To solve the problems of low parameter measurement efficiency and poor accuracy of the small photovoltaic panel, the present application provides solutions in the following aspects.

[0006] In a first aspect, the present application provides a photovoltaic module measurement device, comprising: a plurality of current sampling circuits connected to the photovoltaic panel output line and the super capacitor ground line respectively, for measuring the output current of the photovoltaic panel and the charging current of the super capacitor, wherein each current sampling circuit comprises a selection circuit and a sampling resistor, and the selection circuit is used to switch the sampling resistor with different resistance values according to a preset current threshold; a current detection circuit connected to the corresponding current sampling circuit, for measuring the output current of the photovoltaic panel or the charging current of the super capacitor; a main control system connected to the selection circuit and the current detection circuit, for collecting and calculating the current of the photovoltaic panel output line or the current of the super capacitor ground line, and the main control system is further used to control the selection circuit to select the sampling resistor with different resistance values according to the current size.

[0007] In one embodiment, each current sampling circuit includes at least two sampling resistors with different resistance values, the sampling resistors are connected to the photovoltaic panel output line or the super capacitor ground line through a selection circuit, the input end of the current detection circuit is connected to the sampling resistors, and the output end of the current detection circuit is connected to the master control system.

[0008] In one embodiment, the current detection circuit includes a photovoltaic panel output current detection circuit and a super capacitor charging current detection circuit; wherein the photovoltaic panel output current detection circuit includes a first detection circuit and a second detection circuit, the first detection circuit and the second detection circuit are connected to sampling resistors with different resistance values, the super capacitor charging current detection circuit includes a third detection circuit and a fourth detection circuit, and the third detection circuit and the fourth detection circuit are connected to different sampling resistors.

[0009] In one embodiment, the resistance values of the sampling resistors connected to the first detection circuit and the third detection circuit are greater than the resistance values of the sampling resistors connected to the second detection circuit and the fourth detection circuit.

[0010] In one embodiment, the first detection circuit, the third detection circuit, and the fourth detection circuit each include a single-stage operational amplifier, and the second detection circuit includes a non-inverting amplifier and a differential amplifier connected in sequence.

[0011] In one embodiment, further comprising: a plurality of voltage sampling circuits connected to the photovoltaic panel interface and the super capacitor interface respectively for measuring the voltage of the photovoltaic panel interface and the super capacitor interface; each voltage sampling circuit includes a voltage buffer circuit and a voltage detection circuit, the voltage buffer circuit is connected to the photovoltaic panel interface or the super capacitor interface, and the voltage detection circuit is connected to the voltage buffer circuit and the master control system.

[0012] In one embodiment, the voltage buffer circuit includes a differential amplification circuit, the input end of the differential amplification circuit is connected to the photovoltaic panel interface or the super capacitor interface, and the output end of the differential amplification circuit is connected to the voltage detection circuit.

[0013] In one embodiment, the voltage detection circuit includes an operational amplifier for amplifying the voltage output by the voltage buffer circuit, the input end of the operational amplifier is connected to the output end of the voltage buffer circuit, and the output end of the operational amplifier is connected to the master control system.

[0014] In one embodiment, the amplification factor of the operational amplifier is 0.5 times.

[0015] In one embodiment, further comprising a display circuit connected to the master control system, and the master control system has multiple ADC channels.

[0016] The beneficial effects of the present application are that according to the scheme of the present application, by switching of the sampling resistors in the plurality of current sampling circuits, the multi-channel microampere-level current parameters can be measured simultaneously, the automatic range switching function is provided, the test efficiency and accuracy are improved, and the measuring device is simple in structure, low in cost and suitable for the test scene of the miniature photovoltaic system.

[0017] Further, the multi-channel voltage parameters can be measured, and the measurement efficiency of the low-voltage photovoltaic module is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become readily apparent from the detailed description that follows, read in conjunction with the accompanying drawings. In the drawings, several embodiments of the present application are shown by way of example and not limitation, and like or corresponding reference numerals indicate like or corresponding parts, wherein: Figure 1 is a current detection schematic diagram of a photovoltaic module according to an embodiment of the present application; Figure 2a is a schematic diagram of a photovoltaic panel interface according to an embodiment of the present application; Figure 2b is a schematic diagram of a current sampling circuit of the photovoltaic panel interface according to an embodiment of the present application; Figure 3 is a schematic diagram of a current detection circuit for the photovoltaic panel interface with a sampling resistor of 1KΩ according to an embodiment of the present application; Figure 4 is a schematic diagram of a current detection circuit for the photovoltaic panel interface with a sampling resistor of 100Ω according to an embodiment of the present application; Figure 5a is a schematic diagram of a power supply chip module interface according to an embodiment of the present application; Figure 5b is a schematic diagram of an interface circuit of a super capacitor interface according to an embodiment of the present application; Figure 6 is a schematic diagram of a current sampling circuit of the super capacitor interface according to an embodiment of the present application; Figure 7 is a schematic diagram of a current detection circuit for the super capacitor interface with a sampling resistor of 1KΩ according to an embodiment of the present application; Figure 8 is a schematic diagram of a current detection circuit for the super capacitor interface with a sampling resistor of 100Ω according to an embodiment of the present application; Figure 9 is a voltage detection schematic diagram of a photovoltaic module according to an embodiment of the present application; Figure 10is a schematic diagram showing a voltage buffer circuit for photovoltaic interface voltage detection according to an embodiment of the present application; Figure 11 is a voltage detection circuit diagram for photovoltaic interface voltage detection according to an embodiment of the present application; Figure 12 is a schematic diagram showing a voltage buffer circuit for super capacitor interface voltage detection according to an embodiment of the present application; Figure 13 is a voltage detection circuit diagram for super capacitor interface voltage detection according to an embodiment of the present application. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0020] The specific embodiments of the present application will be described in detail below with reference to the drawings.

[0021] Figure 1 is a current detection schematic diagram of a photovoltaic module according to an embodiment of the present application.

[0022] As shown in Figure 1 , the measurement device of the photovoltaic module includes a plurality of current sampling circuits and a current detection circuit.

[0023] The plurality of current sampling circuits are connected to photovoltaic panel output lines and super capacitor ground lines respectively, for measuring photovoltaic panel output current and super capacitor charging current. Each current sampling circuit includes a selection circuit and a sampling resistor, and the selection circuit is used to switch the sampling resistors with different resistances according to a preset current threshold. In some embodiments, each current sampling circuit includes at least two sampling resistors with different resistances. The sampling resistors are connected to the photovoltaic panel output lines or the super capacitor ground lines through the selection circuit. The input end of the current detection circuit is connected to the sampling resistors, and the output end of the current detection circuit is connected to a master control system.

[0024] The current detection circuit is connected with the corresponding current sampling circuit, and is used for measuring the photovoltaic panel output current or the super capacitor charging current. In some embodiments, the current detection circuit includes a photovoltaic panel output current detection circuit and a super capacitor charging current detection circuit. The photovoltaic panel output current detection circuit includes a first detection circuit and a second detection circuit. The first detection circuit and the second detection circuit are connected with sampling resistors with different resistances, respectively. The super capacitor charging current detection circuit includes a third detection circuit and a fourth detection circuit, and the third detection circuit and the fourth detection circuit are connected with sampling resistors with different resistances, respectively. The resistances of the sampling resistors connected with the first detection circuit and the third detection circuit are greater than the resistances of the sampling resistors connected with the second detection circuit and the fourth detection circuit.

[0025] The first detection circuit, the third detection circuit and the fourth detection circuit all include single-stage operational amplifiers, and the second detection circuit includes a non-inverting amplifier and a differential amplifier connected in sequence.

[0026] The main control system is connected with the selection circuit and the current detection circuit, and is used for collecting and calculating the current of the photovoltaic panel output line or the current of the super capacitor ground line. The main control system is also used for controlling the selection circuit to select the sampling resistors with different resistances according to the current size.

[0027] Further, the photovoltaic assembly of the present application is also provided with a current controller interface for connecting the current controller. The current controller is mainly responsible for controlling the output current of the later stage. The power supply of the current controller has two sources, one is the super capacitor power supply, and the other is the photovoltaic panel power supply. When the voltage of the super capacitor is lower than the voltage of the current controller and the voltage output by the photovoltaic panel is greater than the voltage of the super capacitor, the photovoltaic panel power supply is used. The current controller will select which mode to output the current according to the voltage of the super capacitor. The control principle of the current controller is that when the voltage of the super capacitor >= 3.5V, the boost mode is used, and the output current is half of the input current. When the super capacitor < 3.5V, the direct charging mode is used, and the output current is approximately equal to the input current. In actual use, the current controller depends on the photovoltaic panel output current to a great extent, so the illumination intensity is positively correlated with the current controller. The stronger the illumination intensity is, the greater the photovoltaic panel output current is, and the greater the current output by the current controller is. The measuring device in the present application measures two groups of voltage and current values, which are the output voltage of the photovoltaic panel, the voltage of the super capacitor, the output current of the photovoltaic panel, and the charging current of the super capacitor, that is, the output current of the photovoltaic chip. The circuit for measuring voltage is relatively simple. The photovoltaic panel interface and the super capacitor interface are connected with a voltage buffer circuit and an operational differential amplifier circuit, and then the ADC function of the STM32 is used to collect the operational output voltage, and the output voltage of the photovoltaic panel and the voltage of the super capacitor can be calculated through the formula.

[0028] The following will be described in combination with Figures 2a to 13The scheme of the present application is described in detail. Among them Figures 2a-8 The circuit structure in the current detection content of the present application is described in detail.

[0029] As Figure 2a , Figure 2b , Figure 5a And Figure 5b Three interfaces are provided in the photovoltaic panel interface, photovoltaic chip interface (power chip module interface) and super capacitor interface, which are convenient for connecting different types of photovoltaic components. Figures 2a to 4 The circuit structure for measuring the output current of the photovoltaic panel is described. Figures 5a to 8 The circuit structure for measuring the output current of the photovoltaic chip interface or super capacitor interface is described. Figures 9 to 13 The circuit structure for measuring the voltage of the photovoltaic panel interface and super capacitor interface is described.

[0030] The sampling circuit is connected on the photovoltaic panel and photovoltaic chip connection line, which can measure the output current of the photovoltaic panel. The super capacitor and GND line connection line are connected with the sampling circuit, which can measure the output current of the photovoltaic chip. Specifically, as shown in Figure 2a The power supply end GOUR1_IN of the photovoltaic panel interface H39 is used for current measurement, and SUN_V_CHK_P and SUN_V_CHK_P ends are used for voltage measurement. As shown in Figure 2b The selection circuit is realized by using relay K1 and relay K2. The coil of relay K1 is connected to the working power supply through resistor R53, and is grounded through transistor Q1. The base of the transistor Q1 is connected to R52 and forms the control end GOUR1_R1000_SW. The closing or off control of relay K1 is realized by the voltage of the control end GOUR1_R1000_SW. The two ends of the relay are also connected with the voltage stabilizing tube D1. The contact of relay K1 is connected with the sampling resistor R77 with a resistance of 1KΩ, so as to realize the switching of the sampling resistor. Similarly, the coil of relay K2 is connected to the working power supply through resistor R55, and is grounded through transistor Q2. The base of the transistor Q2 is connected to R54 and forms the control end GOUR1_R100_SW. The closing or off control of relay K2 is realized by the voltage of the control end GOUR1_R100_SW. The two ends of the relay are also connected with the voltage stabilizing tube D2. The contact of relay K1 is connected with the sampling resistor R77 with a resistance of 1KΩ, so as to realize the switching of the sampling resistor.

[0031] As Figure 3As shown, the current detection circuit with a sampling resistor of 1KΩ, i.e., the first detection circuit, adopts a single-stage operational amplifier. The non-inverting input terminal of the operational amplifier U3.1 is connected to the sampling resistor via resistor R16 and grounded via resistor R18, and the inverting input terminal is connected to the power supply terminal GOUR1_IN of the photovoltaic panel interface H39 via resistor R15. Based on this, the present invention realizes current parameter output by voltage measurement and calculation. Feedback resistor R14 is connected between the inverting input terminal and the output terminal to achieve voltage following. The output terminal of the operational amplifier U3.1 is also connected to resistor R17 and capacitor C33 to achieve output filtering. The connection point between resistor R17 and capacitor C33 serves as the output terminal CURRENT_CHECK1 and is connected to the main control system. In addition, filtering is also achieved by capacitors C14 and C13 connected in parallel.

[0032] like Figure 4 As shown, the current detection circuit uses a 100Ω sampling resistor, i.e., the second detection circuit employs two-stage amplification. The non-inverting input of operational amplifier U10.1 is connected to the sampling resistor. The non-inverting input of operational amplifier U10.2 is connected to the power supply terminal GOUR1_IN of photovoltaic panel interface H39. The non-inverting input of operational amplifier U3.2 is connected to the output of operational amplifier U10.1 via resistor R27. Its inverting input is connected to the output of operational amplifier U10.2 via resistor R28, and its output is connected to the non-inverting input via resistor R30. The power supply terminal of operational amplifier U10.1 is also connected to capacitors C36 and C35. The output of operational amplifier U10.2 is also connected to its inverting input. The output of operational amplifier U3.2 is also connected to a filter circuit consisting of resistor R29 and capacitor C34. The connection point between resistor R29 and capacitor C34 is connected to the main control system.

[0033] like Figure 5a As shown, relay K5 is connected to the power chip module interface H36, allowing the power connected to the power chip module interface to control the on / off of relay K5. The coil of relay K5 is connected to the operating power supply through resistor R73, and the two ends of relay K5 are connected to the voltage regulator diode D5. The contacts of relay K5 are connected to the supercapacitor interface H41.

[0034] like Figure 6As shown, in the current sampling circuit of the supercapacitor interface, sampling resistor R79 is connected to the supercapacitor interface via relay K3. Relay K3's coil is connected to the operating power supply via resistor R57 and to ground via transistor Q3. Relay K3 is also connected to a voltage regulator diode D3 at both ends. The base of transistor Q3 is connected to resistor R56, forming a control terminal GOUR2_R1000_SW. The voltage at the control terminal GOUR2_R1000_SW controls the on / off state of relay K3. Similarly, in the current sampling circuit of the supercapacitor interface, sampling resistor R80 is connected to the supercapacitor interface via relay K4. Relay K4's coil is connected to the operating power supply via resistor R59 and to ground via transistor Q4. Relay K4 is also connected to a voltage regulator diode D4 at both ends. The base of transistor Q4 is connected to resistor R58, forming a control terminal GOUR2_R100_SW. The voltage at the control terminal GOUR2_R100_SW controls the on / off state of relay K4. The sampling resistor R79 is 1KΩ, and the sampling resistor R80 is 100Ω.

[0035] like Figure 7 As shown, in this current detection circuit (third detection circuit), the input of operational amplifier U4.1 is connected to both ends of sampling resistor R79 via resistors R32 and R33, and its output is connected to the main control system via resistor R34 and capacitor C26. The output of operational amplifier U4.1 is connected to its inverting input via resistor R35, and its power supply is connected to a +10V operating power supply via capacitors C24 and C25.

[0036] like Figure 8 As shown, in this current detection circuit (fourth detection circuit), the input of operational amplifier U4.2 is connected to both ends of sampling resistor R80 via resistors R37, R41, and R38. Its output is connected to the main control system via resistor R39 and capacitor C27. The output of operational amplifier U4.2 is connected to its inverting input via resistor R40.

[0037] The above current sampling circuit measures current values ​​in the uA range, so a 1kΩ sampling resistor is selected. This is then connected to the differential circuit constructed using the aforementioned operational amplifier. A processor (such as the STM32's ADC function) then samples the op amp's output voltage to calculate the current value. A 10x differential amplifier circuit is designed in the current sampling circuit, so the voltage measured by the ADC is the voltage amplified tenfold by the sampling resistor. Based on Ohm's law (I = U / R) and the ADC voltage calculation formula (V = 3.3 (V) * (AD value / 4095), the current value formula is: I = 3.3 * (AD value / 4095) / 10 / 1000, or I1 = 3.3 * (AD value / 4095) / 10 / 1000.

[0038] When the brightness of the light irradiated is increased, the output current of the photovoltaic panel is also increased, and the voltage value flowing through the sampling resistor is also increased. When the output current of the photovoltaic panel reaches 1 mA, the voltage of the sampling resistor reaches 1 V, which will affect the subsequent circuit. Therefore, a set of sampling circuits is added, and the sampling resistor is 100 Ω. Even if the output current of the photovoltaic panel reaches 1 mA, the voltage of the sampling resistor is only 0.1 V, which has little effect on the subsequent circuit.

[0039] Therefore, two sampling circuits are designed on the current value measurement circuit, and the sampling resistors are 100 Ω and 1 KΩ, respectively. A relay is used to switch the sampling circuits, wherein K1 and K3 are a group, and K2 and K4 are a group. When the device is initially powered on, K1 and K3 are opened by default, and then the device enters the working state of measuring data. When the output current of the photovoltaic panel is greater than 106 uA, the chip controls K2 and K4 to be connected, and K1 and K3 to be disconnected, that is, the sampling circuit with a 100 Ω sampling resistor is switched to measure the current. When the output current of the photovoltaic panel is less than 100 uA, the chip controls K1 and K3 to be connected, and K2 and K4 to be disconnected, that is, the sampling circuit with a 1 KΩ sampling resistor is switched to measure the current.

[0040] Figure 9 is a voltage detection schematic diagram of a photovoltaic module according to an embodiment of the present application.

[0041] As shown in Figure 9 The measurement device of the photovoltaic module further includes a plurality of voltage sampling circuits. The plurality of voltage sampling circuits are connected to the photovoltaic panel interface and the super capacitor interface, respectively, for measuring the voltage of the photovoltaic panel interface and the super capacitor interface. Each voltage sampling circuit includes a voltage buffer circuit and a voltage detection circuit. The voltage buffer circuit is connected to the photovoltaic panel interface or the super capacitor interface, and the voltage detection circuit is connected to the voltage buffer circuit and the main control system.

[0042] In some embodiments, the voltage buffer circuit includes a differential amplification circuit. The input end of the differential amplification circuit is connected to the photovoltaic panel interface or the super capacitor interface, and the output end of the differential amplification circuit is connected to the voltage detection circuit.

[0043] The voltage detection circuit includes an operational amplifier for amplifying the voltage output by the voltage buffer circuit. The input end of the operational amplifier is connected to the output end of the voltage buffer circuit, and the output end of the operational amplifier is connected to the main control system. In one application scenario, the amplification factor of the operational amplifier is 0.5 times.

[0044] Further, the above-mentioned measurement device of the photovoltaic module further includes a display circuit connected to the main control system, wherein the main control system has a plurality of ADC channels.

[0045] The following will be described in combination with Figures 10-13The circuit structure in the above-mentioned embodiment is used to realize the scheme of the present application.

[0046] As shown in Figure 1 , Figure 10 and Figure 11 , the voltage buffer circuit and the voltage detection circuit are connected to the photovoltaic panel interface, so that the output voltage of the photovoltaic panel can be measured. Specifically, as shown in Figure 10 , in the voltage buffer circuit for detecting the voltage of the photovoltaic panel interface, the positive input terminals of the operational amplifiers U9.1 and U9.2 are connected to the two ends of the photovoltaic panel interface, the output terminal of the operational amplifier U9.1 is connected to the inverting input terminal thereof, and the power supply terminals thereof are connected to the filter capacitors C32 and C31. The output terminal of the operational amplifier U9.2 is connected to the inverting input terminal thereof. The positive output terminals of the operational amplifiers U9.1 and U9.2 are connected to the voltage detection circuit.

[0047] As shown in Figure 11 , in the voltage detection circuit for detecting the voltage of the photovoltaic panel interface, the input terminal of the operational amplifier U5.1 is connected to the output terminal of the voltage buffer circuit in Figure 10 through the resistors R62, R63 and R64. The output terminal of the operational amplifier is connected to the inverting input terminal thereof through the resistor R65, and the output terminal thereof is further connected to the main control system through the resistor R66 and the capacitor C29. In addition, the power supply terminals of the operational amplifier U5.1 are further connected to the filter capacitors C30 and C28.

[0048] As shown in Figure 5a , Figure 5b , Figure 12 and Figure 13 , the voltage sampling circuit, i.e. the voltage buffer circuit and the voltage detection circuit, is connected to the super capacitor interface, so that the real-time voltage value of the super capacitor can be detected. As shown in Figure 12 , in the voltage buffer circuit for detecting the voltage of the super capacitor interface, the input terminals of the operational amplifiers U6.1 and U6.2 are connected to the two ends of the super capacitor interface, and the output terminals thereof are connected to the voltage detection circuit. The output terminal of the operational amplifier U6.1 is connected to the inverting input terminal thereof, and the power supply terminals thereof are connected to the filter capacitors C20 and C12. The output terminal of the operational amplifier U6.2 is connected to the inverting input terminal thereof.

[0049] As shown in Figure 13 , in the voltage detection circuit for detecting the voltage of the super capacitor interface, the input terminal of the operational amplifier U5.2 is connected to the voltage buffer circuit in Figure 12 through the resistors R9, R10 and R12. The output terminal of the operational amplifier U5.2 is connected to the inverting input terminal thereof through the resistor R8, and is further connected to the main control system through the resistor R11 and the capacitor C17.

[0050] In the above-mentioned voltage detection circuit structure, the output voltage of the photovoltaic panel is 4.2V when the photovoltaic panel is in no-load state, and the reference voltage collected by the chip ADC is 3.3V, which exceeds the collection range of the ADC, therefore, the application designs a differential amplification circuit with a magnification of 0.5 times to measure the output voltage of the photovoltaic panel and the voltage of the super capacitor. In order not to affect the main circuit, a buffer circuit is added at the input end of the differential circuit, such as Figure 10 and Figure 12 In the program design, the AD value collected by the ADC is calculated by the formula V adc测 =3.3(V)*(AD value / 4095), to calculate the voltage value measured by the ADC channel, and since the magnification of the differential amplification circuit is 0.5 times, the output voltage of the photovoltaic panel and the voltage value of the super capacitor are equal to twice the voltage value of the corresponding ADC channel.

[0051] In summary, when the measuring device in the application is started, K1 and K3 are turned on by default, then the photovoltaic panel, the photovoltaic chip and the super capacitor are connected to the corresponding interfaces, the photovoltaic panel is irradiated by a desk lamp (analog light source), the photovoltaic panel outputs current, which flows through the sampling resistor R77 or R78, and then flows into the photovoltaic chip, the photovoltaic chip automatically adjusts the output current, the circuit flows from the photovoltaic chip to the super capacitor, and then flows through the sampling resistors R79 and R80, and finally flows into the ground. At this time, the TFT display screen will display the current output voltage and output current of the photovoltaic panel and the charging current and voltage of the super capacitor. Adjusting the brightness of the desk lamp will observe the changes of the voltage and current data, and the current data change will be more obvious. When the output current of the photovoltaic panel is greater than 106uA, the chip will send a signal to connect K2 and K4 and disconnect K1 and K3, switching to a high-grade current sampling circuit. When the output current of the photovoltaic panel is greater than 100uA, the chip will send a signal to connect K1 and K3 and disconnect K2 and K4, switching to a low-grade current sampling circuit.

[0052] The terms "first" or "second" and the like used in the present specification are terms used to refer to numbers or ordinal numbers and are used only for the purpose of description, and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "a plurality of" is at least two, for example, two, three or more, unless otherwise explicitly and specifically limited.

[0053] While the specification has illustrated and described various embodiments of the application, it will be clear to those of ordinary skill in the art that various changes, modifications, and substitutions can be made thereto without departing from the spirit and scope of the application. It is understood that in the process of practicing the application, various alternatives, modifications, and equivalents can be employed.

Claims

1. A measuring device for a photovoltaic module, characterized in that The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system.

2. The measuring device of a photovoltaic module according to claim 1, characterized in that, The application relates to a photovoltaic panel output current and super capacitor charging current detection system.

3. The measuring device of a photovoltaic module according to claim 2, characterized in that, The application relates to a photovoltaic panel output current and super capacitor charging current detection system.

4. The measuring device of a photovoltaic module according to claim 3, characterized in that, The application relates to a photovoltaic panel output current and super capacitor charging current detection system.

5. The measuring device of a photovoltaic module according to claim 4, characterized in that, The application relates to a photovoltaic panel output current and super capacitor charging current detection system.

6. The measuring device of a photovoltaic module according to claim 1, characterized by, The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system.

7. The measuring device of a photovoltaic module according to claim 6, characterized in that, The application relates to a photovoltaic panel output current and super capacitor charging current detection system.

8. The measuring device of a photovoltaic module according to claim 7, characterized in that, The application relates to a photovoltaic panel output current and super capacitor charging current detection system.

9. The measuring device of a photovoltaic module according to claim 8, characterized in that, The application relates to a photovoltaic panel output current and super capacitor charging current detection system.

10. The measuring device of a photovoltaic module according to claim 1, characterized by, The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging current detection system. The application relates to a photovoltaic panel output current and super capacitor charging

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