Measuring circuit of solar cell

Abstract

The invention provides a measuring circuit of a solar cell. The measuring circuit comprises a capacitor module, a measuring module, a control module, a second switch, a third switch and a first resistor, the capacitor module comprises a plurality of capacitor units connected in parallel, each capacitor unit comprises a capacitor and a first switch, the first end of the capacitor is connected with the positive electrode of the solar cell, the second end of the capacitor is connected with the first end of the first switch, and the second end of the first switch is connected with the negative electrode of the solar cell; the control module is used for controlling the second switch and the third switch to be switched off and controlling the first switch in the first capacitor unit to be switched on so as to control the solar cell to charge the capacitor in the first capacitor unit; and the control module is also used for controlling the first switch in the next capacitor unit to be switched on when the voltage of the solar cell is greater than a first set threshold value so as to control the solar cell to charge the capacitor in the next capacitor unit until the first switches in all the capacitor units are switched on, so that the measurement accuracy is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of solar cell measurement, and in particular to a solar cell measurement circuit. Background Art

[0002] At present, solar cells are widely used in satellites, vehicles and other fields. For example, solar cells can be loaded on satellites to convert solar energy into electrical energy. In order to ensure the normal operation of solar cells, it is usually necessary to measure the parameters of solar cells. However, there is a problem of low accuracy in the measurement of solar cell parameters in the related art. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, the first embodiment of the present disclosure provides a solar cell measurement circuit, including: a capacitor module, a measurement module, a control module, a second switch, a third switch and a first resistor; wherein,

[0005] The capacitor module includes a plurality of capacitor units connected in parallel, wherein each of the capacitor units includes a capacitor and a first switch, a first end of the capacitor is connected to the positive electrode of the solar cell, a second end of the capacitor is connected to the first end of the first switch, and a second end of the first switch is connected to the negative electrode of the solar cell;

[0006] The measuring module is connected to the solar cell and is used to measure the parameters of the solar cell;

[0007] The first end of the second switch is connected to the positive electrode of the solar cell, and the second end of the second switch is connected to the negative electrode of the solar cell;

[0008] The first end of the first resistor is connected to the positive electrode of the solar cell, the second end of the first resistor is connected to the first end of the third switch, and the second end of the third switch is connected to the negative electrode of the solar cell;

[0009] The control module is used to control the second switch and the third switch to be turned off, and control the first switch in the first capacitor unit to be turned on, so as to control the solar cell to charge the capacitor in the first capacitor unit;

[0010] The control module is also used to control the first switch in the next capacitor unit to be turned on when the voltage of the solar cell is greater than a first set threshold, so as to control the solar cell to charge the capacitor in the next capacitor unit until the first switches in all the capacitor units are turned on.

[0011] The measurement circuit of the solar cell of the embodiment of the present disclosure includes a capacitor module, a measurement module, a control module, a second switch, a third switch and a first resistor, wherein the capacitor module includes a plurality of capacitor units connected in parallel, wherein each capacitor unit includes a capacitor and a first switch, the first end of the capacitor is connected to the positive electrode of the solar cell, the second end of the capacitor is connected to the first end of the first switch, and the second end of the first switch is connected to the negative electrode of the solar cell, the control module is used to control the second switch and the third switch to be turned off, and control the first switch in the first capacitor unit to be turned on, so as to control the solar cell to charge the capacitor in the first capacitor unit, and the control module is also used to control the first switch in the next capacitor unit to be turned on when the voltage of the solar cell is greater than the first set threshold, so as to control the solar cell to charge the capacitor in the next capacitor unit, until the first switches in all the capacitor units are turned on. Thus, multiple capacitor units are connected in parallel, and the turning on or off of the multiple capacitor units does not affect each other, so the multiple capacitor units can be controlled separately, and the parameters of the solar cell can be measured multiple times by turning on or off the first switch, the second switch and the third switch, thereby increasing the collection points near the optimal operating point of the solar cell, improving the accuracy of the measurement of the solar cell parameters, especially the accuracy of the measurement of the optimal operating point of the solar cell, and is suitable for the measurement scenario of the volt-ampere characteristic curve of the solar cell.

[0012] In addition, the solar cell measurement circuit proposed in the above embodiment of the present disclosure may also have the following additional technical features:

[0013] In one embodiment of the present disclosure, if the number of the capacitor units is three, the control module is further used to control the second switch and the third switch to be turned off, and control the first switch in the first capacitor unit to be turned on, so as to control the solar cell to charge the capacitor in the first capacitor unit;

[0014] The control module is also used to control the first switch in the second capacitor unit to be turned on when the voltage of the solar cell is greater than the first set threshold for the first time, so as to control the solar cell to charge the capacitor in the second capacitor unit;

[0015] The control module is further configured to control the first switch in the third capacitor unit to be turned on when the voltage of the solar cell is greater than the first set threshold again, so as to control the solar cell to charge the capacitor in the third capacitor unit.

[0016] In one embodiment of the present disclosure, after the first switch in the third capacitor unit is controlled to be turned on, the control module is further used to control the third switch to be turned on when the current of the solar cell is less than a second set threshold;

[0017] The control module is further configured to control the second switch to be turned on and control each of the first switches to be turned off when the turn-on time of the third switch reaches a third set threshold.

[0018] In one embodiment of the present disclosure, the measurement module is also used to start measuring the parameters of the solar cell in response to the first switch in the first capacitor unit being turned on, and stop measuring the parameters of the solar cell in response to the current of the solar cell being less than the second set threshold.

[0019] In one embodiment of the present disclosure, it also includes: multiple driving modules; wherein each of the driving modules includes a first power supply, a diode, a second resistor and a third resistor, wherein the output end of the first power supply is connected to the first end of the second resistor, the second end of the second resistor is connected to the anode of the diode, the cathode of the diode is connected to the first end of the third resistor, and the second end of the third resistor is connected to the negative electrode of the solar cell; the cathode of the diode is connected to the third end of the target switch, wherein the target switch is any one of the first switch, the second switch and the third switch.

[0020] In one embodiment of the present disclosure, the control module includes a drive instruction generating unit; wherein the drive instruction generating unit is used to generate a drive instruction, and the drive instruction is used to control whether the target switch is turned on, and the output end of the drive instruction generating unit is connected to the third end of the target switch.

[0021] In one embodiment of the present disclosure, the measurement module includes a current measurement unit; wherein the current measurement unit includes a fourth resistor, an instrument amplifier and a fifth resistor, wherein the first end of the fourth resistor is connected to the second end of each of the first switches, the second end of the fourth resistor is connected to the negative electrode of the solar cell, the first end and the second end of the fourth resistor are connected to the instrument amplifier, and the first end and the second end of the fifth resistor are connected to the instrument amplifier.

[0022] In one embodiment of the present disclosure, the measurement module includes a voltage measurement unit; wherein the voltage measurement unit includes a sixth resistor, a seventh resistor and a voltage regulator, wherein the first end of the sixth resistor is connected to the positive electrode of the solar cell, the second end of the sixth resistor is connected to the cathode of the voltage regulator and the first end of the seventh resistor, and the anode of the voltage regulator and the second end of the seventh resistor are connected to the negative electrode of the solar cell.

[0023] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 A schematic diagram of the structure of a solar cell measurement circuit provided by an embodiment of the present disclosure;

[0026] Figure 2 A schematic diagram of the structure of another solar cell measurement circuit provided by an embodiment of the present disclosure;

[0027] Figure 3 A schematic diagram of the structure of another solar cell measurement circuit provided by an embodiment of the present disclosure; DETAILED DESCRIPTION

[0028] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0029] The measurement circuit of the solar cell according to the embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0030] Figure 1 A schematic diagram of the structure of a solar cell measurement circuit provided by an embodiment of the present disclosure.

[0031] like Figure 1 As shown, the solar cell measurement circuit 100 according to the embodiment of the present disclosure includes a capacitor module 1, a measurement module 2, a control module 3, a second switch Q2, a third switch Q3 and a first resistor R1.

[0032] The capacitor module 1 includes a plurality of capacitor units 11 connected in parallel, wherein each capacitor unit 11 includes a capacitor C and a first switch Q1, a first end of the capacitor C is connected to the positive electrode of the solar cell 200, a second end of the capacitor C is connected to the first end of the first switch Q1, and a second end of the first switch Q1 is connected to the negative electrode of the solar cell 200.

[0033] The measuring module 2 is connected to the solar cell 200 and is used to measure parameters of the solar cell 200 .

[0034] A first end of the second switch Q2 is connected to the positive electrode of the battery 200 , and a second end of the second switch Q2 is connected to the negative electrode of the battery 200 .

[0035] A first end of the first resistor R1 is connected to the positive electrode of the battery 200 , a second end of the first resistor R1 is connected to a first end of the third switch Q3 , and a second end of the third switch Q3 is connected to the negative electrode of the battery 200 .

[0036] The control module 3 is used to control the second switch Q2 and the third switch Q3 to be turned off, and control the first switch Q1 in the first capacitor unit 11 to be turned on, so as to control the solar cell 200 to charge the capacitor C in the first capacitor unit 11 .

[0037] The control module 3 is also used to control the first switch Q1 in the next capacitor unit 11 to turn on when the voltage of the solar cell 200 is greater than the first set threshold, so as to control the solar cell 200 to charge the capacitor C in the next capacitor unit 11 until the first switches Q1 in all capacitor units 11 are turned on.

[0038] It can be understood that when the voltage of the solar cell 200 is greater than the first set threshold, it indicates that the charging of the capacitor C connected to the first switch Q1 that was turned on most recently is complete, and the first switch Q1 in the next capacitor unit 11 is controlled to be turned on to continue charging the capacitor C in the next capacitor unit 11. The solar cell 200 can be controlled to charge the capacitors C in multiple capacitor units 11 in sequence, respectively, and multiple measurements of the parameters of the solar cell 200 can be achieved.

[0039] It should be noted that there are no excessive limitations on the solar cell 200 . For example, the solar cell can be installed on a spacecraft.

[0040] It should be noted that there are no excessive restrictions on the parameters of the solar cell 200 , for example, they may include output voltage, output current, temperature of the solar cell 200 , angle between the solar cell 200 and sunlight (ie, illumination angle), etc.

[0041] In one implementation, the first switch Q1, the second switch Q2, and the third switch Q3 may include power switch tubes, for example, may include NMOS (N-Metal-Oxide-Semiconductor) transistors of the IRF7455 model.

[0042] In one implementation, the first resistor R1 may include a power resistor. For example, the first resistor R1 = 5Ω (ohm).

[0043] It should be noted that there are no excessive restrictions on the first set threshold value. For example, the first set threshold value is 90% of the theoretical calculated value of the output voltage at the optimal working point at the highest temperature at the end of the life of the battery 200.

[0044] In summary, the measurement circuit of the solar cell according to the embodiment of the present disclosure includes a capacitor module, a measurement module, a control module, a second switch, a third switch and a first resistor, wherein the capacitor module includes a plurality of capacitor units connected in parallel, wherein each capacitor unit includes a capacitor and a first switch, the first end of the capacitor is connected to the positive electrode of the solar cell, the second end of the capacitor is connected to the first end of the first switch, and the second end of the first switch is connected to the negative electrode of the solar cell, the control module is used to control the second switch and the third switch to be turned off, and control the first switch in the first capacitor unit to be turned on, so as to control the solar cell to charge the capacitor in the first capacitor unit, and the control module is also used to control the first switch in the next capacitor unit to be turned on when the voltage of the solar cell is greater than the first set threshold, so as to control the solar cell to charge the capacitor in the next capacitor unit, until the first switches in all capacitor units are turned on. Thus, multiple capacitor units are connected in parallel, and the turning on or off of the multiple capacitor units does not affect each other, so the multiple capacitor units can be controlled separately, and the parameters of the solar cell can be measured multiple times by turning on or off the first switch, the second switch and the third switch, thereby increasing the collection points near the optimal operating point of the solar cell, improving the accuracy of the measurement of the solar cell parameters, especially the accuracy of the measurement of the optimal operating point of the solar cell, and is suitable for the measurement scenario of the volt-ampere characteristic curve of the solar cell.

[0045] Based on any of the above embodiments, Figure 2 As shown, the control module 3 includes a microprocessor 31 and an instruction drive chip 32. The microprocessor 31 includes a C8051F040 microprocessor, and the instruction drive chip 32 includes an SG2823 instruction drive chip.

[0046] In one embodiment, continue with Figure 2 For example, the microprocessor 31 includes a first I / O (Input / Output) port 311 , an analog-to-digital converter 312 , a second I / O port 313 and a CAN (Controller Area Network) bus controller 314 .

[0047] The first I / O port 311 is connected to the measurement module 2 and the analog-to-digital converter 312, the second I / O port 313 is connected to the input end of the instruction driver chip 32, the output end of the instruction driver chip 32 is connected to the capacitor module 1, and the CAN bus controller 314 is connected to the CAN bus interface module 4. The CAN bus interface module 4 may include a CAN bus interface circuit of the TJA1040 model.

[0048] The analog-to-digital converter 312 is used to perform analog-to-digital conversion on the analog signal output by the measuring module 2 to obtain a digital signal.

[0049] The microprocessor 31 is also used to generate an initial instruction, the second I / O port 313 is used to output the initial instruction, and the instruction driver chip 32 is used to generate a drive instruction based on the initial instruction. That is, the microprocessor 31 and the instruction driver chip 32 constitute a drive instruction generation unit. It should be noted that the relevant content of the drive instruction generation unit can be found in the following embodiments, which will not be repeated here.

[0050] In one embodiment, continue with Figure 2 For example, the solar cell measurement circuit 100 of the embodiment of the present disclosure further includes a CAN bus interface module 4 , an on-board information processing host computer 5 and a satellite-to-ground communication module 6 .

[0051] The CAN bus interface module 4 is connected to the onboard information processing host computer 5 , and the onboard information processing host computer 5 is connected to the satellite-to-ground communication module 6 . The CAN bus controller 314 and the CAN bus interface module 4 are used to realize the CAN bus communication between the microprocessor 31 and the onboard information processing host computer 5 .

[0052] The microprocessor 31 is also used to perform data processing on the parameters of the solar cell 200 output by the measurement module 2 to obtain a telemetry data packet, and send the telemetry data packet to the onboard information processing host computer 5. The onboard information processing host computer 5 is used to send the telemetry data packet to the satellite-to-ground communication module 6. The satellite-to-ground communication module 6 is used to send the telemetry data packet to ground equipment (not shown in the figure).

[0053] In some examples, the onboard information processing host computer 5 is further used to send a telemetry polling instruction to the microprocessor 31 according to the polling cycle, and the microprocessor 31 is further used to respond to the telemetry polling instruction and send a telemetry data packet to the onboard information processing host computer 5. The polling cycle is greater than the measurement cycle of the measurement module 2.

[0054] The ground equipment is used to obtain the parameters of the solar cell 200 based on the telemetry data packet. For example, the ground equipment is used to decode the telemetry data packet to obtain the output voltage and output current of the solar cell 200 at temperature t and illumination angle θ, and based on the output voltage and output current of the solar cell 200 at temperature t and illumination angle θ, obtain the volt-ampere characteristic curve of the solar cell 200 at temperature t and illumination angle θ.

[0055] In one embodiment, Figure 2 As shown, the measuring module 2 includes a temperature measuring unit 21 , an illumination angle measuring unit 22 , a current measuring unit 23 , and a voltage measuring unit 24 .

[0056] The temperature measurement unit 21 includes a second power supply 211 (such as a +3.3V DC power supply), an eighth resistor R8 and a thermistor Rt. The output end of the second power supply 211 is connected to the first end of the eighth resistor R8, the second end of the eighth resistor R8 is connected to the first end of the thermistor Rt, and the second end of the thermistor Rt is grounded. The second end of the eighth resistor R8 is connected to the first I / O port 311 of the microprocessor 31. The second end of the eighth resistor R8 is used to output a temperature measurement signal. The thermistor Rt may include a MF51 model thermistor with a temperature measurement range of -50°C to 150°C, and the thermistor Rt is pasted on the bottom of the solar cell 200.

[0057] The illumination angle measurement unit 22 includes a simulated solar sensor 221. The simulated solar sensor includes a four-quadrant differential simulated solar sensor. The simulated solar sensor 221 is installed in parallel with the solar cell 200. The output end of the simulated solar sensor 221 is connected to the first I / O port 311 of the microprocessor 31. The output end of the simulated solar sensor 221 is used to output an illumination angle measurement signal.

[0058] The structures of the current measuring unit 23 and the voltage measuring unit 24 may be referred to in the following embodiments, and will not be described in detail here.

[0059] Based on any of the above embodiments, Figure 3 As shown, the negative terminal of the solar cell 200 is grounded.

[0060] In one embodiment, continue with Figure 3 For example, if the number of capacitor units 11 is three, the capacitor C includes a capacitor C1 in the first capacitor unit, a capacitor C2 in the second capacitor unit, and a capacitor C3 in the third capacitor unit. The first switch Q1 includes a first switch Q 11 , the first switch Q in the second capacitor unit 12 , the first switch Q in the third capacitor unit 13 .

[0061] The control module 3 is also used to control the second switch Q2 and the third switch Q3 to be turned off, and to control the first switch Q in the first capacitor unit to be turned off. 11 The solar cell 200 is turned on to control the solar cell 200 to charge the capacitor C1 in the first capacitor unit.

[0062] The control module 3 is also used to control the first switch Q in the second capacitor unit when the voltage of the solar cell 200 is greater than the first set threshold for the first time, indicating that the capacitor C1 in the first capacitor unit is fully charged. 12 The solar cell 200 is turned on to control the solar cell 200 to charge the capacitor C2 in the second capacitor unit.

[0063] The control module 3 is also used to control the first switch Q in the third capacitor unit when the voltage of the solar cell 200 is greater than the first set threshold again, indicating that the capacitor C2 in the second capacitor unit is fully charged. 13 The solar cell 200 is turned on to control the solar cell 200 to charge the capacitor C3 in the third capacitor unit.

[0064] In some examples, controlling the first switch Q in the third capacitor unit 13 After being turned on, the control module 3 is also used to control the third switch Q3 to be turned on when the current of the solar cell 200 is less than the second set threshold, indicating that the capacitor C3 in the third capacitor unit is fully charged, so that the capacitors C1, C2 and C3 can discharge the first resistor R1.

[0065] In some examples, the control module 3 is further configured to control the second switch Q2 to turn on and each first switch Q1 to turn off, i.e., control the first switch Q3 to turn off when the on time of the third switch Q3 reaches a third set threshold, indicating that the discharge of the capacitors C1, C2, and C3 is completed. 11 , the first switch Q 12 , the first switch Q 13 Shut down.

[0066] It can be understood that the conduction of the second switch Q2 can achieve a short circuit between the positive electrode and the negative electrode of the solar cell 200 .

[0067] Based on any of the above embodiments, Figure 3 For example, measurement module 2 ( Figure 3 (not shown) is also used to respond to the first switch Q in the first capacitor unit 11 When the solar cell 200 is turned on, that is, when the solar cell 200 starts to charge the capacitor C1, the parameters of the solar cell 200 are measured, and in response to the current of the solar cell 200 being less than the second set threshold, the parameters of the solar cell 200 are stopped from being measured. Thus, the measuring module can measure the parameters of the solar cell when the solar cell is charging at least one capacitor, and stop measuring the parameters of the solar cell when all capacitors are fully charged.

[0068] Based on any of the above embodiments, a single measurement process of the parameters of the solar cell 200 is as follows:

[0069] S1, after the solar cell measurement circuit 100 is powered on and initialized, the control module 3 is used to control the second switch Q2 and the third switch Q3 to be turned on, and control each first switch Q1 to be turned off. At this time, the solar cell measurement circuit 100 is in an initial state.

[0070] S2, the temperature measuring unit 21 is used to measure the temperature of the solar cell 200 at least once, and the illumination angle measuring unit 22 is used to measure the illumination angle of the solar cell 200 at least once.

[0071] S3, the control module 3 is used to control the second switch Q2 and the third switch Q3 to turn off, and control the plurality of first switches Q1 to turn on in sequence, so as to control the solar cell 200 to charge the plurality of capacitors C in sequence. It should be noted that the content of the control module 3 controlling the plurality of first switches Q1 to turn on in sequence can be referred to the above embodiment, which will not be repeated here.

[0072] S4, the current measuring unit 23 is used to respond to the first switch Q in the first capacitor unit 11 The solar cell 200 is turned on to start measuring the current of the solar cell 200 , and in response to the current of the solar cell 200 being less than the second set threshold, the solar cell 200 is stopped from measuring the current of the solar cell 200 .

[0073] S5, the voltage measuring unit 24 is used to respond to the first switch Q in the first capacitor unit 11 The solar cell 200 is turned on to start measuring the voltage of the solar cell 200 , and in response to the current of the solar cell 200 being less than the second set threshold, the voltage of the solar cell 200 is stopped being measured.

[0074] S6, the control module 3 is also used to control the third switch Q3 to turn on when the current of the solar cell 200 is less than the second set threshold, and to control the second switch Q2 to turn on and control each first switch Q1 to turn off when the turn-on time of the third switch Q3 reaches the third set threshold. At this time, the solar cell measurement circuit 100 returns to the initial state, and the single measurement process of the parameters of the solar cell 200 is completed.

[0075] After step S6, the microprocessor 31 is also used to frame the temperature measurement signal, illumination angle measurement signal, current measurement signal and voltage measurement signal of the solar cell 200 during a single measurement of the parameters of the solar cell 200 to form a telemetry data packet for a single measurement, and send the telemetry data packet to the onboard information processing host computer 5 in response to the telemetry polling instruction.

[0076] It should be noted that there are no excessive restrictions on the second set threshold and the third set threshold.

[0077] In one embodiment, the second set threshold is 5 mA (milliampere).

[0078] In one embodiment, the third set threshold is the discharge time of capacitor C. For example, if Vt=0.1%Vu, R1=5Ω, C1=C2=C3=470uF (microfarads), the third set threshold may be 60ms (milliseconds), where Vt is the capacitor voltage at the end of capacitor C discharge, and Vu is the capacitor voltage at the beginning of capacitor C discharge.

[0079] On the basis of any of the above embodiments, the solar cell measurement circuit 100 of the embodiment of the present disclosure further includes a plurality of driving modules 7 .

[0080] Each driving module 7 includes a first power supply 71 (such as a +12V DC power supply), a diode D, a second resistor R2 and a third resistor R3, wherein the output end of the first power supply 71 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the anode of the diode D, the cathode of the diode D is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the negative electrode of the solar cell 200.

[0081] The cathode of the diode D is connected to the third end of the target switch, wherein the target switch is any one of the first switch Q1 , the second switch Q2 and the third switch Q3 .

[0082] In one embodiment, continue with Figure 3 For example, the solar cell measurement circuit 100 of the embodiment of the present disclosure further includes five driving modules 7 .

[0083] The first power supply 71 includes a first power supply 711 in the first driving module, a first power supply 712 in the second driving module, a first power supply 713 in the third driving module, a first power supply 714 in the fourth driving module, and a first power supply 715 in the fifth driving module.

[0084] The diode D includes a diode D1 in the first driving module, a diode D2 in the second driving module, a diode D3 in the third driving module, a diode D4 in the fourth driving module, and a diode D5 in the fifth driving module.

[0085] The second resistor R2 includes the second resistor R in the first driving module 21 , the second resistor R in the second driver module 22 , the second resistor R in the third driver module 23 , the second resistor R in the fourth drive module 24 , the second resistor R in the fifth driving module 25 .

[0086] The third resistor R3 includes the third resistor R in the first driving module 31, the third resistor R in the second driver module 32 , the third resistor R in the third driver module 33 , the third resistor R in the fourth drive module 34 , the third resistor R in the fifth drive module 35 .

[0087] The cathode of the diode D1 is connected to the third end of the second switch Q2, the cathode of the diode D2 is connected to the third end of the third switch Q3, and the cathode of the diode D3 is connected to the first switch Q 11 The cathode of the diode D4 is connected to the first switch Q 12 The third end of the diode D5 is connected to the cathode of the first switch Q 13 The third end of the connection.

[0088] Based on any of the above embodiments, the control module 3 includes a drive instruction generating unit, wherein the drive instruction generating unit is used to generate a drive instruction, the drive instruction is used to control whether the target switch is turned on, and the output end of the drive instruction generating unit is connected to the third end of the target switch.

[0089] In some examples, continue with Figure 3 For example, the drive instruction generating unit includes a microprocessor 31 and an instruction driving chip 32, the instruction driving chip 32 includes a first output terminal y1, a second output terminal y2, a third output terminal y3, a fourth output terminal y4 and a fifth output terminal y5, the first output terminal y1 is used to output a drive instruction for controlling whether the second switch Q2 is turned on, the second output terminal y2 is used to output a drive instruction for controlling whether the third switch Q3 is turned on, and the third output terminal y3 is used to output a drive instruction for controlling whether the first switch Q 11 The fourth output terminal y4 is used to output a driving instruction for controlling the first switch Q 12 The fifth output terminal y5 is used to output a driving instruction for controlling the first switch Q 13 Whether the drive instruction is turned on.

[0090] The first output terminal y1 is connected to the third terminal of the second switch Q2, the second output terminal y2 is connected to the third terminal of the third switch Q3, and the third output terminal y3 is connected to the first switch Q 11 The third end of the fourth output terminal y4 is connected to the first switch Q 12 The third end of the fifth output terminal y5 is connected to the first switch Q 13 The third end of the connection.

[0091] On the basis of any of the above embodiments, the measurement module 2 includes a current measurement unit 23. The current measurement unit 23 includes a fourth resistor R4, an instrumentation amplifier 231, and a fifth resistor R5, wherein a first end of the fourth resistor R4 is connected to a second end of each first switch Q1, a second end of the fourth resistor R4 is connected to a negative electrode of the solar cell 200, a first end and a second end of the fourth resistor R4 are connected to the instrumentation amplifier 231, and a first end and a second end of the fifth resistor R5 are connected to the instrumentation amplifier.

[0092] It should be noted that the fifth resistor R5 may include a gain adjustment resistor. In some examples, the fifth resistor R5 = 5 mΩ, and the instrumentation amplifier 231 may include an AD620 instrumentation amplifier.

[0093] In some examples, continue with Figure 3 For example, the first end of the fourth resistor R4 and the first switch Q 11 , the first switch Q 12 , the first switch Q 13 The second end of the fourth resistor R4 is connected to the negative electrode of the solar cell 200. The first end of the fourth resistor R4 is connected to the 3rd pin of the AD620 instrumentation amplifier 231 ( Figure 3 The second end of the fourth resistor R4 is connected to the 2nd pin ( Figure 3 The first end of the fifth resistor R5 is connected to the 1st pin ( Figure 3 The second end of the fifth resistor R5 is connected to the 8th pin ( Figure 3 x8) connection in .

[0094] In some examples, continue with Figure 3 For example, the current measuring unit 23 also includes a third power supply 232 (such as a -15V DC power supply), a fourth power supply 233 (such as a +15V DC power supply), and the output end of the third power supply 232 is connected to the 4th pin ( Figure 3 The output end of the fourth power supply 233 is connected to the 7th pin ( Figure 3 x7) connection in.

[0095] In some examples, continue with Figure 3 For example, the 5th pin of AD620 instrument amplifier 231 ( Figure 3 x5 in the circuit is grounded.

[0096] In some examples, continue with Figure 3 For example, the 6th pin of the AD620 instrument amplifier 231 ( Figure 3 The pin x6 in the figure is connected to the first I / O port 311 of the microprocessor 31. The pin 6 of the AD620 instrument amplifier 231 is used to output a current measurement signal.

[0097] Based on any of the above embodiments, Figure 3 For example, the measurement module 2 (not shown in the figure) includes a voltage measurement unit 24. The voltage measurement unit 24 includes a sixth resistor R6, a seventh resistor R7 and a voltage regulator Z, wherein a first end of the sixth resistor R6 is connected to the positive electrode of the solar cell 200, a second end of the sixth resistor R6 is connected to the cathode of the voltage regulator Z and the first end of the seventh resistor R7, and an anode of the voltage regulator Z and a second end of the seventh resistor R7 are connected to the negative electrode of the solar cell 200.

[0098] In some examples, continue with Figure 3 For example, the second end of the sixth resistor R6 is connected to the first I / O port 311 of the microprocessor 31. The second end of the sixth resistor R6 is used to output a voltage measurement signal.

[0099] It should be noted that Figures 1 to 3 The measurement circuit of the solar cell shown is only an example of the measurement circuit of the solar cell in the embodiment of the present disclosure, and is not a limitation of the measurement circuit of the solar cell in the embodiment of the present disclosure.

[0100] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0102] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A solar cell measurement circuit, characterized in that: include: A capacitance module, a measurement module, a control module, a second switch, a third switch and a first resistor; wherein, The capacitor module includes a plurality of capacitor units connected in parallel, wherein each of the capacitor units includes a capacitor and a first switch, a first end of the capacitor is connected to the positive electrode of the solar cell, a second end of the capacitor is connected to the first end of the first switch, and a second end of the first switch is connected to the negative electrode of the solar cell; The measuring module is connected to the solar cell and is used to measure the parameters of the solar cell; The first end of the second switch is connected to the positive electrode of the solar cell, and the second end of the second switch is connected to the negative electrode of the solar cell; The first end of the first resistor is connected to the positive electrode of the solar cell, the second end of the first resistor is connected to the first end of the third switch, and the second end of the third switch is connected to the negative electrode of the solar cell; The control module is used to control the second switch and the third switch to be turned off, and control the first switch in the first capacitor unit to be turned on, so as to control the solar cell to charge the capacitor in the first capacitor unit; The control module is also used to control the first switch in the next capacitor unit to be turned on when the voltage of the solar cell is greater than a first set threshold, so as to control the solar cell to charge the capacitor in the next capacitor unit until the first switches in all the capacitor units are turned on.

2. The circuit according to claim 1, characterized in that If the number of the capacitor units is three, the control module is further used to control the second switch and the third switch to be turned off, and control the first switch in the first capacitor unit to be turned on, so as to control the solar cell to charge the capacitor in the first capacitor unit; The control module is also used to control the first switch in the second capacitor unit to be turned on when the voltage of the solar cell is greater than the first set threshold for the first time, so as to control the solar cell to charge the capacitor in the second capacitor unit; The control module is further configured to control the first switch in the third capacitor unit to be turned on when the voltage of the solar cell is greater than the first set threshold again, so as to control the solar cell to charge the capacitor in the third capacitor unit.

3. The circuit according to claim 2, characterized in that After the first switch in the third capacitor unit is controlled to be turned on, the control module is further used to control the third switch to be turned on when the current of the solar cell is less than a second set threshold; The control module is further configured to control the second switch to be turned on and control each of the first switches to be turned off when the turn-on time of the third switch reaches a third set threshold.

4. The circuit according to claim 3, characterized in that The measuring module is further configured to start measuring the parameters of the solar cell in response to the first switch in the first capacitor unit being turned on, and stop measuring the parameters of the solar cell in response to the current of the solar cell being less than the second set threshold.

5. The circuit according to claim 1, characterized in that Also includes: Multiple drive modules; among them, Each of the driving modules comprises a first power supply, a diode, a second resistor and a third resistor, wherein the output end of the first power supply is connected to the first end of the second resistor, the second end of the second resistor is connected to the anode of the diode, the cathode of the diode is connected to the first end of the third resistor, and the second end of the third resistor is connected to the negative electrode of the solar cell; A cathode of the diode is connected to a third end of a target switch, wherein the target switch is any one of the first switch, the second switch and the third switch.

6. The circuit according to claim 5, characterized in that The control module includes a drive instruction generating unit; wherein, The driving instruction generating unit is used to generate a driving instruction, and the driving instruction is used to control whether the target switch is turned on. The output end of the driving instruction generating unit is connected to the third end of the target switch.

7. The circuit according to any one of claims 1 to 6, characterized in that: The measuring module comprises a current measuring unit; wherein, The current measurement unit includes a fourth resistor, an instrumentation amplifier and a fifth resistor, wherein the first end of the fourth resistor is connected to the second end of each of the first switches, the second end of the fourth resistor is connected to the negative electrode of the solar cell, the first end and the second end of the fourth resistor are connected to the instrumentation amplifier, and the first end and the second end of the fifth resistor are connected to the instrumentation amplifier.

8. The circuit according to any one of claims 1 to 6, characterized in that: The measurement module includes a voltage measurement unit; wherein, The voltage measuring unit includes a sixth resistor, a seventh resistor and a voltage regulator, wherein the first end of the sixth resistor is connected to the positive electrode of the solar cell, the second end of the sixth resistor is connected to the cathode of the voltage regulator and the first end of the seventh resistor, and the anode of the voltage regulator and the second end of the seventh resistor are connected to the negative electrode of the solar cell.

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