Photovoltaic charging control method, device and photovoltaic charging equipment

Abstract

The present invention discloses a photovoltaic charging control method, device and photovoltaic charging equipment; solar cell voltage and charging battery voltage are obtained; a first control signal output module outputs a first control signal when judging that the solar cell voltage and charging battery voltage meet a first condition; the first condition is at least that the solar cell voltage is greater than the charging battery voltage; a power supply output control module is connected to the first control signal output module, and the first control signal controls its output power supply; a second control signal output module is connected to the power supply output control module, and the power supply obtains the second control signal to lock and control the output power supply; a control module is connected to the power supply output control module, and is configured with a determination time length, and is configured to obtain the solar cell voltage in real time, and control whether the power supply within the next determination time length is output and whether charging is started according to the size and fluctuation of each solar cell voltage within the determination time length. The present invention improves the user experience.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic charging, and in particular, relates to a photovoltaic charging control method, device and photovoltaic charging equipment. Background Art

[0002] Photovoltaic power generation is a form of power generation that uses the photovoltaic effect of solar photovoltaic cells to directly convert solar energy into electrical energy. Solar photovoltaic power generation systems are generally composed of solar panels, solar controllers, battery packs, DC-AC inverters and AC power distribution equipment. Solar panels are the core part of solar photovoltaic power generation systems. They use the photovoltaic effect of semiconductors to directly convert light energy into electrical energy and send it to batteries for storage; then the electrical energy in the battery is converted into AC power required by household appliances for practical applications through processes such as boosting and inversion.

[0003] Since the energy absorbed by solar cells is affected by weather, sunlight intensity, irradiation angle, etc., the voltage of solar cells fluctuates greatly. Considering the withstand voltage of each component in the charging circuit, the software sets the input range of solar cell voltage. If it is not within the range, it will not start. Therefore, when the weather changes rapidly, the voltage of the solar cell will fluctuate, which will cause the charging circuit to switch frequently, affecting the service life of switching components such as transistors and relays and batteries. In addition, the noise of the frequent switching of relays will also bring a bad experience to users. Summary of the invention

[0004] The present invention provides a photovoltaic charging control method, device and photovoltaic charging equipment, which solve the problem of frequent switching of the charging circuit caused by solar cell voltage fluctuations due to frequent weather changes, extend the service life of switching components and batteries, improve the reliability of photovoltaic charging equipment, and enhance user experience.

[0005] A photovoltaic charging control method, comprising:

[0006] Obtain solar cell voltage and rechargeable battery voltage in real time;

[0007] Comparing the solar cell voltage with the rechargeable battery voltage, and outputting a first control signal for controlling the output power supply when the solar cell voltage and the rechargeable battery voltage meet a first condition; the first condition is at least that the solar cell voltage is greater than the rechargeable battery voltage;

[0008] Obtaining a high-level second control signal from the output power supply, for locking and controlling the output of the power supply;

[0009] Setting the determination time; controlling whether the power supply is output and whether charging is started within the next determination time according to the magnitude and fluctuation of the solar cell voltage within the current determination time.

[0010] In a specific embodiment, controlling whether the power supply is output and whether charging is started according to the change of the voltage of each solar cell within the determination time period includes:

[0011] Setting a charging start voltage threshold; cyclically timing the determination time;

[0012] comparing the voltage of each solar cell obtained within the determination time with the charging start voltage threshold;

[0013] If the voltages of the solar cells are all within the range of the charging start voltage threshold within the determination time, charging is started within the next determination time;

[0014] If the voltages of the solar cells are not within the range of the charging start voltage threshold within the determination time, the charging is stopped and a third control signal is output within the next determination time; the third control signal controls the power supply to be stopped;

[0015] If some of the solar cell voltages within the determination time are within the range of the charge start voltage threshold and some are not within the range of the charge start voltage threshold, the charging state of the previous determination time is controlled to continue within the next determination time.

[0016] In some specific embodiments, a startup power supply voltage threshold is set; and the first condition is that the difference between the solar cell voltage and the rechargeable battery voltage is within the range of the startup power supply voltage threshold.

[0017] A photovoltaic charging control device, comprising:

[0018] A solar cell voltage acquisition module, which is used to connect to a solar cell to acquire the solar cell voltage;

[0019] A rechargeable battery voltage acquisition module, which is used to connect to the rechargeable battery to obtain the rechargeable battery voltage;

[0020] a first control signal output module, which is connected to the solar cell voltage acquisition module and the rechargeable battery voltage acquisition module respectively, receives the solar cell voltage and the rechargeable battery voltage in real time, and outputs a first control signal when the solar cell voltage and the rechargeable battery voltage meet a first condition; the first condition is at least that the solar cell voltage is greater than the rechargeable battery voltage;

[0021] A power supply output control module, which is connected to the rechargeable battery and the first control signal output module, and outputs power supply when receiving the first control signal;

[0022] A second control signal output module, which is connected to the power supply output control module, and outputs a high-level second control signal when the power supply output control module outputs the power supply, to control the power supply output control module to lock and output the power supply;

[0023] A control module is connected to the solar cell voltage acquisition module and the power supply output control module, is configured with a determination time length, and is configured to acquire the solar cell voltage in real time, and control whether the power supply is output and whether charging is started within the next determination time length according to the magnitude and fluctuation of the multiple solar cell voltages acquired within the determination time length.

[0024] In a specific embodiment, the control module is configured with a charging start voltage threshold, and is configured to cycle the timing of the determination time length and receive the solar cell voltage in real time;

[0025] comparing the solar cell voltage with the charging start voltage threshold within the determination time;

[0026] If the voltages of the solar cells are within the range of the charging start voltage threshold within the determination time, the control module controls the charging to start within the next determination time;

[0027] If the voltages of the solar cells are not within the range of the charging start voltage threshold within the determination time, the control module controls to stop charging and outputs a third control signal within the next determination time; the third control signal controls to stop outputting the power supply;

[0028] If some of the solar cell voltages are within the range of the charging start voltage threshold and some are not within the range of the charging start voltage threshold within the determination time, the control module controls to maintain the charging state of the previous determination time within the next determination time.

[0029] In a specific embodiment, the second control signal output module is connected to the control module; when the power supply output control module outputs the power supply, the second control signal output module outputs the second control signal to the control module; the control module outputs a fourth control signal according to the second control signal, which is used to lock and control the power supply output control module to output the power supply.

[0030] In a specific embodiment, the power supply output control module includes a second controllable switch, a third controllable switch, a fifth resistor, and a sixth resistor; the second control signal output module includes a seventh resistor and an eighth resistor;

[0031] The second controllable switch is a PNP transistor; the third controllable switch is an NPN transistor; the emitter of the second controllable switch is connected to the rechargeable battery and one end of the fifth resistor; the base of the second controllable switch is connected to the other end of the fifth resistor and one end of the sixth resistor; the other end of the sixth resistor is connected to the collector of the third controllable switch; the base of the third controllable switch is connected to the first control signal output module and the control module; the emitter of the third controllable switch is grounded; the control module is configured to output the third control signal to the base of the third controllable switch;

[0032] The seventh resistor and the eighth resistor are connected in series, one end of the series circuit is connected to the collector of the second controllable switch, and the other end is grounded; the common end of the seventh resistor and the eighth resistor is connected to the base of the third controllable switch.

[0033] In a specific embodiment, the power supply output control module includes a second controllable switch, a third controllable switch, a fifth resistor, and a sixth resistor; the second control signal output module includes a seventh resistor and an eighth resistor;

[0034] The second controllable switch is a PNP transistor; the third controllable switch is an NPN transistor; the emitter of the second controllable switch is connected to the rechargeable battery and one end of the fifth resistor; the base of the second controllable switch is connected to the other end of the fifth resistor and one end of the sixth resistor; the other end of the sixth resistor is connected to the collector of the third controllable switch; the base of the third controllable switch is connected to the first control signal output module and the control module; the emitter of the third controllable switch is grounded; the control module is configured to output the third control signal to the base of the third controllable switch;

[0035] The seventh resistor is connected in series with the eighth resistor, one end of the series circuit is connected to the collector of the second controllable switch, and the other end is grounded; the common end of the seventh resistor and the eighth resistor is connected to the control module; the control module is configured to output the fourth control signal to the base of the third controllable switch when receiving the second control signal.

[0036] In some specific embodiments, the first control signal output module includes a first diode, a second diode, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first controllable switch;

[0037] The second diode is a voltage regulator; the first controllable switch is a PNP transistor; the positive electrode of the first diode is connected to the solar cell voltage acquisition module, and the negative electrode is connected to the negative electrode of the second diode; the positive electrode of the second diode is connected to one end of the first resistor and the emitter of the first controllable switch; the other end of the first resistor is connected to the base of the first controllable switch and one end of the second resistor; the other end of the second resistor is connected to the rechargeable battery voltage acquisition module; the third resistor is connected in series with the fourth resistor, one end of the series circuit is connected to the collector of the first controllable switch, and the other end is grounded; the common end of the third resistor and the fourth resistor is connected to the base of the third controllable switch, for outputting the first control signal to the power supply output control module.

[0038] A solar charging device comprises the above-mentioned photovoltaic charging control device.

[0039] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0040] Compared with the prior art, the advantages and positive effects of the present invention are as follows: a photovoltaic power generation control method, device and photovoltaic power generation equipment of the present invention control the power supply output control module to output the power supply through the second control signal provided by the output power supply, and the power supply itself locks the output of the power supply to achieve self-locking of the power supply; prevents the problem of frequent changes in the output state of the power supply due to rapid weather changes when the power supply output is controlled by comparing the solar cell voltage with the charging battery voltage; and after the power supply is self-locked, the change of the solar cell voltage is judged in stages within the determination time, and the output and charging state of the power supply are controlled according to the change of the solar cell voltage within the determination time, firstly, the charging state and the output state of the power supply are delayed for the stage change of the solar cell voltage, the control frequency is reduced, and the charging state will not change frequently when the weather changes rapidly, thereby improving the life of the switch element and the battery, and then improving the reliability of solar charging and the life of the solar charging equipment; reducing frequent switching noise and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1It is a flow chart of an embodiment of a photovoltaic power generation control method proposed by the present invention;

[0043] Figure 2 This is a functional module connection diagram of an embodiment of a photovoltaic power generation control device proposed by the present invention;

[0044] Figure 3 It is a functional module connection diagram of another embodiment of a photovoltaic power generation control device proposed by the present invention;

[0045] Figure 4 It is a circuit connection diagram of an embodiment of a photovoltaic power generation control device proposed by the present invention;

[0046] Figure 5 It is a circuit connection diagram of another embodiment of a photovoltaic power generation control device proposed by the present invention.

[0047] In the figure,

[0048] 1. Solar cell; 2. Rechargeable battery; 3. Solar cell voltage acquisition module; 4. Rechargeable battery voltage acquisition module; 5. First control signal output module; 6. Power supply output control module; 7. Control module; 8. Second control signal output module;

[0049] D1, first diode; D2, second diode; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; Q1, first controllable switch; Q2, second controllable switch; Q3, third controllable switch; BAT+, charging battery voltage; PV+, solar cell voltage; DC-DC Power, DC step-down module; Self-Lock, second control signal; Drive on, fourth control signal. DETAILED DESCRIPTION

[0050] Embodiments of the present invention 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 invention, and should not be construed as limiting the present invention.

[0051] In a specific embodiment, referring to Figure 1 , Figure 2 , a photovoltaic charging control method of the present invention includes the following steps.

[0052] Obtain solar cell voltage PV+ and rechargeable battery voltage BAT+ in real time;

[0053] Compare the solar cell voltage PV+ with the rechargeable battery voltage BAT+, and output a first control signal when the solar cell voltage PV+ and the rechargeable battery voltage BAT+ meet a first condition, for controlling the output power supply; wherein the first condition is at least that the solar cell voltage PV+ is greater than the rechargeable battery voltage BAT+; the high voltage of the solar cell voltage PV+ is the basic condition for low-voltage charging of the rechargeable battery 2;

[0054] A high-level second control signal Self-Lock is obtained from the output power supply, which is used to control the self-locking output of the power supply; that is, the power supply is used to realize the power supply of the low-voltage circuit; a high-level second control signal Self-Lock is obtained from the output power supply, which covers the first control signal to control the output of the power supply, and realizes the self-locking output of the power supply;

[0055] Set the judgment time; control the power supply output state and charging state within the next judgment time according to the size and fluctuation of the solar cell voltage PV+ within the current judgment time; that is, control whether the power supply within the next judgment time is output and whether to start charging according to the size and fluctuation of multiple solar cell voltages PV+ within the current judgment time.

[0056] The photovoltaic charging control method of this embodiment ensures that the rechargeable battery 2 is charged by the solar cell 1 when charging starts by setting the first condition that at least the solar cell voltage PV+ is greater than the rechargeable battery voltage BAT+. The power supply output is self-locked by providing the second control signal Self-Lock by the power supply, so that once the power supply is output, it is no longer affected by weather changes. Then, according to the size and fluctuation of the solar cell voltage PV+ within the determination time, control whether the power supply stops and whether the charging stops; the staged judgment with the determination time as the length can more objectively determine whether the current light intensity and weather conditions are stable, and control the charging state and power supply output state within the next determination time according to the weather conditions, reduce the control frequency of charging control and power supply output; reduce the switching noise of the switching element. Solve the problem of poor user experience and equipment life caused by frequent weather changes, improve the life of switching elements and batteries, and then extend the life of photovoltaic charging equipment, improve the reliability of photovoltaic power generation, and enhance the user experience.

[0057] In a specific embodiment, referring to Figure 1 , Figure 3 , a photovoltaic charging control method of the present invention includes the following steps.

[0058] Obtain solar cell voltage PV+ and rechargeable battery voltage BAT+ in real time;

[0059] Compare the solar cell voltage PV+ with the rechargeable battery voltage BAT+, and output a first control signal when the solar cell voltage PV+ and the rechargeable battery voltage BAT+ meet a first condition, for controlling the output power supply; wherein the first condition is at least that the solar cell voltage PV+ is greater than the rechargeable battery voltage BAT+; the high voltage of the solar cell voltage PV+ is the basic condition for low-voltage charging of the rechargeable battery 2;

[0060] A high-level second control signal Self-Lock is obtained from the output power supply, which is used to control the locked output of the power supply; that is, the power supply is used to realize the power supply of the low-voltage circuit; the second control signal Self-Lock is obtained from the power supply, and the second control signal Self-Lock triggers the continuous output of the fourth control signal Drive on, which covers the first control signal to control the output of the power supply, thereby realizing the locked output of the power supply;

[0061] Set the judgment time; control the power supply output state and charging state within the next judgment time according to the size and fluctuation of the solar cell voltage PV+ within the current judgment time; that is, control whether the power supply within the next judgment time is output and whether charging is started according to the size and fluctuation of multiple solar cell voltages PV+ within the previous judgment time.

[0062] The photovoltaic charging control method of this embodiment sets the first condition that at least the solar cell voltage PV+ is greater than the charging battery voltage BAT+ to ensure that the charging battery 2 can be charged by the solar cell 1 when the low-voltage power supply and charging are started. The fourth control signal Drive on that is continuously outputted is triggered by the second control signal Self-Lock provided by the power supply to realize the locked output of the power supply, so that once the power supply is controlled by the solar cell voltage PV+, it is no longer controlled by weather changes. Then, according to the size and fluctuation of the solar cell voltage PV+ during the determination time, a control signal is output to control whether the power supply stops and whether the charging stops; the staged judgment of the determination time can more objectively determine whether the current light intensity and weather conditions are stable, and the charging state and power supply output state within the next determination time are controlled according to the light intensity and weather stability, so as to reduce the frequency of charging control and power supply output control; and reduce the switching noise of the switching element. The problem of poor user experience and equipment life caused by frequent weather changes is solved, and the life of the switching element and the battery is improved, thereby extending the life of the photovoltaic charging equipment, improving the reliability of photovoltaic power generation, and enhancing the user experience.

[0063] In a specific embodiment, the photovoltaic power generation equipment of the present invention includes a solar cell 1, a rechargeable battery 2, a charging circuit, and a photovoltaic power generation control device; the rechargeable battery 2 is connected to the charging circuit; the charging circuit is connected to the photovoltaic power generation control device, and whether to start is controlled by the photovoltaic power generation control device, and when the charging circuit is started, the rechargeable battery 2 can be charged by the solar cell 1.

[0064] In a specific embodiment, referring to Figure 1 , Figure 2 The photovoltaic power generation control device includes a solar cell voltage acquisition module 3, a charging battery voltage BAT+ acquisition module 4, a first control signal output module 5, a power supply output control module 6, a second control signal output module 8, and a control module 7.

[0065] The solar cell voltage acquisition module 3 is connected to the solar cell 1 and is used to acquire the solar cell voltage PV+; the charging battery voltage BAT+ acquisition module 4 is connected to the charging battery 2 and is used to acquire the charging battery voltage BAT+; the first control signal output module 5 is respectively connected to the solar cell voltage acquisition module 3 and the charging battery voltage acquisition module 4, compares the solar cell voltage PV+ and the charging battery voltage BAT+, and outputs a first control signal when at least the first condition that the solar cell voltage PV+ is greater than the charging battery voltage BAT+ is met.

[0066] The first control signal output module 5 is connected to the power supply output control module 6, and is used to control the power supply output control module 6 to output power supply; the power supply output control module 6 is respectively connected to the rechargeable battery 2 and the control module 7; when the first control signal output module 5 outputs the first control signal, the power supply output control module 6 outputs power supply to provide a low-voltage power supply for the control module 7.

[0067] The second control signal output module 8 is respectively connected to the common end of the power supply output control module 6 and the power supply output control module 6 and the first signal output module, and obtains a high-level second control signal from the output power supply, and outputs it to the common end of the first signal output module and the power supply output control module 6; that is, when the power supply output control module 6 outputs power supply, the second control signal output module 8 outputs a high-level second control signal Self-Lock, which is used to cover the first control signal to control the power supply output control module 6 to output power supply, thereby realizing the self-locking of the power supply output control module 6 to output power supply, so that the output of the power supply is no longer affected by the relationship between the solar cell voltage PV+ and the charging battery voltage BAT+ and remains output.

[0068] The control module 7 is respectively connected to the common end of the first control signal output module 5 and the power supply output control module 6, and the solar cell voltage acquisition module 3, and is configured with a determination time, and is configured to time the cyclic determination time, obtain the solar cell voltage PV+ in real time, and output a control signal according to the size and fluctuation of the solar cell voltage PV+ to control the power supply output control module 6 whether to output power and whether to charge.

[0069] The photovoltaic charging control device of this embodiment controls the power supply output of the power supply output control module 6 through the second control signal Self-Lock provided by the output power supply, locks the output of the power supply, and realizes the self-locking output of the power supply; prevents the problem of frequent changes in the power supply output state caused by rapid weather changes when the power supply output is controlled by comparing the solar cell voltage PV+ with the charging battery voltage BAT+; and when the power supply is self-locked, the size and fluctuation of the solar cell voltage PV+ are judged in stages within the judgment time, and the output and charging state of the power supply are controlled according to the judgment result, the frequency of the power supply output state control and the charging state control is reduced, and then the switching frequency of the switching element is reduced, so that the charging state will not change frequently when the weather changes rapidly, thereby improving the reliability of solar charging; improving the life of the switching element and the battery, thereby extending the life of the solar charging equipment; reducing the switching noise of the switching element, and improving the user experience.

[0070] In a specific embodiment, referring to Figure 1 , Figure 3 The photovoltaic power generation control device includes a solar cell voltage acquisition module 3, a charging battery voltage acquisition module 4, a first control signal output module 5, a power supply output control module 6, a second control signal output module 8, and a control module 7.

[0071] The solar cell voltage acquisition module 3 is connected to the solar cell 1 and is used to acquire the solar cell voltage PV+; the charging battery voltage acquisition module 4 is connected to the charging battery 2 and is used to acquire the charging battery voltage BAT+; the first control signal output module 5 is respectively connected to the solar cell voltage acquisition module 3 and the charging battery voltage acquisition module 4, compares the solar cell voltage PV+ and the charging battery voltage BAT+, and outputs a first control signal when at least the first condition that the solar cell voltage PV+ is greater than the charging battery voltage BAT+ is met.

[0072] The first control signal output module 5 is connected to the power supply output control module 6, and is used to control the power supply output control module 6 to output power supply; the power supply output control module 6 is respectively connected to the rechargeable battery 2 and the control module 7; when the first control signal output module 5 outputs the first control signal, the power supply output control module 6 outputs power supply to provide a low-voltage power supply for the control module 7.

[0073] The second control signal output module 8 is connected to the power supply output control module 6 and the control module 7 respectively, obtains a high-level second control signal Self-Lock from the output power supply, and outputs it to the control module 7; the control module 7 is connected to the common end of the first control signal output module 5 and the power supply output control module 6, and continuously outputs a fourth control signal Drive on triggered by the second control signal Self-Lock to the power supply output control module 6, which is used to lock and control the power supply output; that is, when the power supply output control module 6 outputs power supply, the second control signal output module 8 outputs the second control signal Self-Lock, which triggers the control module 7 to continuously output the fourth control signal Drive on, which is used to cover the first control signal to control the power supply output control module 6 to output power supply, so as to achieve the locking of the power supply output control module 6, so that the output of the power supply is no longer affected by the relationship between the solar cell voltage PV+ and the charging battery voltage BAT+ and remains output.

[0074] The control module 7 is connected to the common end of the first control signal output module 5 and the power supply output control module 6, and the solar cell voltage acquisition module 3, and is configured with a determination time, and is configured to time the cyclic determination time, obtain the solar cell voltage PV+ in real time, and output a control signal according to the size and fluctuation of the solar cell voltage PV+ to control the power supply output control module 6 whether to output power and whether to charge.

[0075] The control module 7 is connected to the power supply output control module 6, and outputs a third control signal or does not output the third control signal according to the comparison result between each solar cell voltage PV+ obtained within the determination time and the charging start voltage threshold; when the third control signal is output, the power supply output is stopped; when the third control signal is not output, the corresponding port of the control module 7 is in a high impedance state.

[0076] The ports of the control module 7 that output the third control signal and the fourth control signal Drive on can share or use separate ports; when the corresponding port does not output the third control signal and the fourth control signal Drive on, it is in a high impedance state.

[0077] The photovoltaic charging control device of this embodiment triggers the control module 7 to continuously output the fourth control signal Drive on to lock and control the power supply output control module 6 to output the power supply through the second control signal Self-Lock provided by the output power supply; prevents the problem of frequent changes in the power supply output state caused by rapid weather changes when the power supply output is controlled by comparing the solar cell voltage PV+ with the charging battery voltage BAT+; and when the power supply output is locked, the size and fluctuation of the solar cell voltage PV+ are periodically judged within the judgment time, and the output and charging state of the power supply are controlled according to the judgment result, so as to reduce the frequency of the power supply output state control and the charging state control, thereby reducing the switching frequency of the switching element, so as to truly ensure that the charging state does not change frequently when the weather changes rapidly, thereby improving the reliability of solar charging; improving the life of the switching element and the battery, thereby extending the life of the solar charging equipment; reducing the switching noise of the switching element, and improving the user experience.

[0078] In a specific embodiment, referring to Figure 1 , Figure 2 , Figure 3 The photovoltaic power generation control method controls the output state and charging state of the power supply according to the size and fluctuation of the solar cell voltage PV+, and specifically includes the following contents.

[0079] A charging start voltage threshold is set; within the same determination time, the solar cell voltage PV+ is obtained in real time for multiple times, and it is determined whether the solar cell voltage PV+ is within the range of the charging start voltage threshold.

[0080] If the obtained solar cell voltages PV+ are all within the range of the charging start voltage threshold within the same determination time, they are all controlled to be in the charging state within the next determination time, that is, the solar cell 1 charges the rechargeable battery 2.

[0081] If the obtained solar cell voltages PV+ are not within the range of the charge start voltage threshold within the same determination time, the charging state is controlled to be stopped within the next determination time, and the third control signal is output to control the power supply to stop outputting; that is, if the obtained solar cell voltages PV+ are not within the range of the charge start voltage threshold within the same determination time, the charging circuit is controlled to stop starting before or at the beginning of the next determination time, the rechargeable battery 2 is stopped from charging, and the third control signal having the opposite effect to the second control signal Self-Lock is controlled to output to stop the power supply from outputting, thereby stopping the output of the second control signal Self-Lock and releasing the output self-lock of the power supply. That is, when the solar cell voltages PV+ are not within the range of the charge start voltage threshold within the same determination time, the charging and power supply output are controlled to stop before or at the beginning of the next determination time.

[0082] If, within the same determination time period, some of the obtained solar cell voltages PV+ are within the range of the charging start voltage threshold, while others are not within the range of the charging start voltage threshold, then the charging state of the current determination time period is maintained within the next determination time period; that is, when some of the obtained solar cell voltages PV+ are within the range of the charging start voltage threshold, while others are not within the range of the charging start voltage threshold, the control does not output the third control signal, and the output of the power supply is maintained; in addition, the charging state within the current determination time period is maintained within the next determination time period; that is, if the current determination time period is in the charging state, and the solar cell voltages PV+ include both satisfying the charging start voltage threshold requirement and not satisfying the charging start voltage threshold requirement, then the next determination time period is also in the charging state; if the current determination time period is in the non-charging state, and the solar cell voltages include both satisfying the charging start voltage threshold requirement and not satisfying the charging start voltage threshold requirement, then the next determination time period is also in the non-charging state.

[0083] The photovoltaic charging control method of this embodiment maintains the output of the power supply by a self-locking method, so that once the power supply is output, it is no longer affected by the comparison result of the solar cell voltage PV+ and the charging battery voltage BAT+ and maintains the output; when the power supply maintains the output, the charging state and whether to release the continuous output of the power supply are controlled by detecting the size and fluctuation of the solar cell voltage PV+, and the judgment period of the change of the charging state is extended to the judgment time, thereby reducing the frequency of the change of the charging state and the change of the power supply output state, and improving the reliability and life; the judgment condition of the charging state and the power supply output state within the next judgment time is the stability of multiple solar cell voltages PV+ obtained within the current judgment time, and when stable, the charging state and the power supply output state are controlled according to the stability condition; when unstable, the charging state and the power supply output state are controlled not to change, further reducing the frequency of changing the charging state and the power supply output state when the solar cell voltage PV+ is unstable, and further improving the reliability and life.

[0084] In a specific embodiment, the photovoltaic charging control method further includes setting a start-up power supply voltage threshold; the first condition is that the difference between the solar cell voltage PV+ and the charging battery voltage BAT+ is within the range of the start-up power supply voltage threshold.

[0085] The photovoltaic charging control method of this embodiment ensures the efficiency of the solar cell 1 charging the rechargeable battery 2 by setting the supply voltage threshold, thereby improving the charging efficiency, protecting the rechargeable battery 2 , and extending the life of the rechargeable battery 2 .

[0086] In a specific embodiment, referring to Figure 1 , Figure 2 The control module 7 of the photovoltaic charging control device is configured with a charging start voltage threshold, and is configured to time the cycle determination duration, and receives the solar cell voltage PV+ output by the solar cell voltage acquisition module 3 in real time.

[0087] The control module 7 is further configured to compare the obtained multiple solar cell voltages PV+ with the charging start voltage threshold within the determination time;

[0088] If the solar cell voltages PV+ obtained within the determination time are all within the range of the charge start voltage threshold, the charging circuit is controlled to be started within the next determination time, so that the solar cell 1 charges the rechargeable battery 2; and multiple solar cell voltages PV+ are continuously obtained within the next determination time, and the obtained solar cell voltages PV+ are compared with the charge start voltage threshold to control the charging state and the power supply output state within the subsequent determination time; if the charging circuit is in the start state within the current determination time, the charging circuit is controlled to maintain the start state; that is, the solar cell 1 is kept charging the rechargeable battery 2;

[0089] If the solar cell voltages PV+ obtained within the determination time are not within the range of the charging start voltage threshold, the control module 7 controls to stop starting the charging circuit at the beginning of the next determination time or at the end of the current determination time, so that the solar cell 1 stops charging the rechargeable battery 2; the control module 7 outputs a third control signal to the power supply output control module 6 to control the power supply output module to stop outputting power supply; if the charging circuit is in a stopped state within the current determination time, the charging circuit is controlled to be kept in the stopped state, and the third control signal is output to the power supply output control module 6;

[0090] If some of the solar cell voltages PV+ are within the range of the charging start voltage threshold value and some are not within the range of the charging start voltage threshold value within the determination time length, the control module 7 maintains the state of the charging circuit within the next determination time length and does not output the third control signal, so that the power supply output control module 6 maintains the output of the power supply, and continues to obtain multiple solar cell voltages PV+ and compares them with the charging start voltage threshold value for subsequent control of the charging circuit state and the power supply output state.

[0091] The control module 7 is connected to the power supply output control module 6, and outputs a third control signal or does not output the third control signal according to the comparison result of each solar cell voltage PV+ obtained within the determination time and the charging start voltage threshold; when the third control signal is not output, the corresponding port of the control module 7 is in a high impedance state.

[0092] The photovoltaic charging control device of this embodiment maintains the output of the power supply by a self-locking method, so that once the power supply is output, it is no longer affected by the comparison result of the solar cell voltage PV+ and the charging battery voltage BAT+ and maintains the output; when the power supply maintains the output, the charging circuit startup state and whether to release the self-locking output of the power supply are controlled by detecting the size and fluctuation of the solar cell voltage PV+, and the judgment period of the change of the charging state is extended to the judgment duration, thereby reducing the frequency of the change of the charging state and the change of the power supply output state, and improving the reliability and life of the photovoltaic charging device; the judgment condition of the charging state and the power supply output state within the next judgment duration is the size and fluctuation of multiple solar cell voltages PV+ obtained within the current judgment duration, and when the fluctuation is large, the charging state and the power supply output state of the current judgment duration are maintained within the next judgment duration, further reducing the frequency of changing the charging state and the power supply output state when the solar cell voltage PV+ is unstable, and further improving the reliability and life of the photovoltaic charging device.

[0093] In a specific embodiment, referring to Figure 4 , Figure 5The solar cell voltage acquisition module 3 and the rechargeable battery 2 acquisition module of the photovoltaic charging control device can be conductive paths directly connected to the solar cell voltage output terminal and the rechargeable battery voltage output terminal.

[0094] In a specific embodiment, referring to Figure 2 , Figure 3 , Figure 4 , Figure 5 The first control signal output module 5 of the photovoltaic charging control device includes a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first controllable switch Q1.

[0095] The first diode D1 is a common diode; the second diode D2 is a voltage regulator; the first controllable switch Q1 is a PNP transistor; the anode of the first diode D1 is connected to the solar cell 1, and the cathode is connected to the cathode of the second diode D2; the anode of the second diode D2 is connected to one end of the first resistor R1 and the emitter of the first controllable switch Q1; the other end of the first resistor R1 is connected to the base of the first controllable switch Q1 and one end of the second resistor R2; the other end of the second resistor R2 is connected to the rechargeable battery 2; the third resistor R3 and the fourth resistor R4 are connected in series, one end of the series circuit is connected to the collector of the first controllable switch Q1, and the other end is grounded; the common end of the third resistor R3 and the fourth resistor R4 is used to output the first control signal.

[0096] The photovoltaic charging control device of this embodiment sets the first condition that the difference between the solar cell voltage PV+ and the charging battery voltage BAT+ is not less than the sum of the conduction voltage drop of the first diode D1, the breakdown voltage of the second diode D2 and the conduction voltage drop of the first controllable switch Q1 through the first diode D1, the second diode D2 and the first controllable switch Q1 of the first control signal output module 5. When the first condition is met, the first controllable switch Q1 is connected, and the common end of the third resistor R3 and the fourth resistor R4 outputs the first control signal, which is a high level.

[0097] Of course, the first controllable switch Q1 can also be an NPN transistor or other MOS controllable switch tube, and the circuit for controlling its on and off can be modified accordingly.

[0098] In a specific embodiment, referring to Figure 2 , Figure 4The power supply output control module 6 of the photovoltaic charging control device includes a second controllable switch Q2, a third controllable switch Q3, a fifth resistor R5, and a sixth resistor R6; the second controllable switch Q2 is a PNP-type transistor; the third controllable switch Q3 is an NPN-type transistor; the emitter of the second controllable switch Q2 is connected to the rechargeable battery 2 and one end of the fifth resistor R5; the base of the second controllable switch Q2 is connected to the other end of the fifth resistor R5 and one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to the collector of the third controllable switch Q3; the base of the third controllable switch Q3 is connected to the common end of the third resistor R3 and the fourth resistor R4 and the control module 7; the emitter of the third controllable switch Q3 is grounded.

[0099] The second control signal output module 8 of the photovoltaic charging control device includes a seventh resistor R7 and an eighth resistor R8; after the seventh resistor R7 and the eighth resistor R8 are connected in series, one end of the series circuit is connected to the collector of the second controllable switch Q2, and the other end is grounded; the common end of the seventh resistor R7 and the eighth resistor R8 is connected to the common end of the third resistor R3 and the fourth resistor R4, and is used to output the second control signal Self-Lock; here, the second control signal Self-Lock is a high level, which is consistent with the first control signal, and is used to self-lock the output of the power supply.

[0100] When the third controllable switch Q3 is connected, the second controllable switch Q2 is connected; when the second controllable switch Q2 is connected, the charging battery voltage BAT+ is output as the power supply; the collector of the second controllable switch Q2 is connected to the DC step-down module DC-DC Power, and the power supply is stepped down by the DC step-down module DC-DC Power to provide a low-voltage power supply for the control module 7.

[0101] In the photovoltaic charging control device of this embodiment, when the solar cell voltage PV+ and the charging battery voltage BAT+ meet the first condition, the first controllable switch Q1 is connected and the first control signal is output; the first control signal controls the third controllable switch Q3 to be connected, and the second controllable switch Q2 is connected to output the power supply; the second control signal output module 8 obtains the second control signal Self-Lock from the power supply and outputs it to the common end of the third resistor R3 and the fourth resistor R4 to lock the output of the power supply. At this time, the output state of the control module 7 to the common end of the third resistor R3 and the fourth resistor R4 is a high impedance state.

[0102] The control module 7 acquires the solar cell voltage PV+ in real time during the power supply of the low-voltage power supply; when the voltages PV+ of each solar cell within the determination time are within the range of the charging start voltage threshold, the control module 7 controls the charging circuit to start within the next determination time, and the output of the control module 7 to the common end of the third resistor R3 and the fourth resistor R4 is in a high impedance state; when the voltages PV+ of each solar cell within the determination time are not within the range of the charging start voltage threshold, the control module 7 controls the charging circuit to be disconnected before or at the beginning of the next determination time, that is, the solar cell 1 stops charging the rechargeable battery 2; The control module 7 outputs a third control signal to the common end of the third resistor R3 and the fourth resistor R4, where the third control signal is at a low level, and pulls down the first control signal and the second control signal Self-Lock, so that the third controllable switch Q3 is disconnected, and then the second controllable switch Q2 is disconnected, and the power supply output is stopped; when the voltages PV+ of the solar cells within the determination time are either within the range of the charge start voltage threshold or not within the range of the charge start voltage threshold, the control module 7 maintains the control of the charging circuit state during the previous determination time and does not output the third control signal during the next determination time.

[0103] Of course, the second controllable switch Q2 can be an NPN transistor or a MOS switch tube; the third controllable switch Q3 can be a PNP transistor or a MOS switch tube, and the corresponding switch control circuit is adjusted accordingly; as long as the first control signal and the second control signal Self-Lock have the same control level and are different from the third control signal.

[0104] In a specific embodiment, referring to Figure 3 , Figure 5 The power supply output control module 6 includes a second controllable switch Q2, a third controllable switch Q3, a fifth resistor R5, and a sixth resistor R6.

[0105] The second controllable switch Q2 is a PNP transistor; the third controllable switch Q3 is an NPN transistor; the emitter of the second controllable switch Q2 is connected to the rechargeable battery 2 and one end of the fifth resistor R5; the base of the second controllable switch Q2 is connected to the other end of the fifth resistor R5 and one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to the collector of the third controllable switch Q3; the base of the third controllable switch Q3 is connected to the common end of the third resistor R3 and the fourth resistor R4 and the control module 7; the emitter of the third controllable switch Q3 is grounded.

[0106] The second control signal output module 8 includes a seventh resistor R7 and an eighth resistor R8; the seventh resistor R7 and the eighth resistor R8 are connected in series, and one end of the series circuit is connected to the collector of the second controllable switch Q2, and the other end is grounded; the common end of the seventh resistor R7 and the eighth resistor R8 is used to output the second control signal Self-Lock, and is connected to the control module 7.

[0107] When the power supply output control module 6 of the photovoltaic charging control device of this embodiment controls the output of the power supply by the first control signal, the second control signal output module 8 obtains the second control signal Self-Lock from the power supply and outputs it to the control module 7; when receiving the second control signal Self-Lock, the control module 7 keeps outputting the fourth control signal Drive on to the base of the third controllable switch Q3, so that it remains connected and locks the output of the power supply.

[0108] The control module 7 acquires multiple solar cell voltages PV+ in real time during the determination time, and compares each solar cell voltage PV+ with the charging start voltage threshold; when each solar cell voltage PV+ within the determination time is within the range of the charging start voltage threshold, the control module 7 controls the charging circuit to start within the next determination time, and the solar cell 1 charges the rechargeable battery 2; when each solar cell voltage PV+ within the determination time is not within the range of the charging start voltage threshold, the control module 7 outputs a third control signal to the base of the third controllable switch Q3 before or at the beginning of the next determination time, pulls down the first control signal and / or the fourth control signal Drive on, and stops the output of the power supply.

[0109] The third control signal and the fourth control signal Drive on can be output from the same port of the control module 7. At this time, the fourth control signal Drive on is stopped and the third control signal of low level is output, which pulls down the first control signal, turns off the third controllable switch Q3, and then turns off the second controllable switch Q2, and stops outputting the power supply.

[0110] The third control signal and the fourth control signal Drive on can also be output from different ports of the control module 7. When the third control signal outputs a low level, the output of the port of the fourth control signal Drive on is changed to a high impedance state; when the port outputting the fourth control signal Drive on outputs a high level, the port outputting the third control signal is in a high impedance state.

[0111] Of course, the second controllable switch Q2 can be an NPN transistor or a MOS switch tube; the third controllable switch Q3 can be a PNP transistor or a MOS switch tube, and the switch control circuit is adjusted accordingly; as long as the first control signal and the second control signal Self-Lock have the same control level and are different from the third control signal.

[0112] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0113] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0114] 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 invention. 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.

[0115] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A photovoltaic charging control method, characterized in that: The rechargeable battery is connected to the power supply output control module to output the power supply to the control module; including: Obtain solar cell voltage and rechargeable battery voltage in real time; Comparing the solar cell voltage with the rechargeable battery voltage, and outputting a first control signal for controlling the output of the power supply when the solar cell voltage and the rechargeable battery voltage meet a first condition; the first condition is at least that the solar cell voltage is greater than the rechargeable battery voltage; Obtaining a high-level second control signal from the output power supply, for locking and controlling the output of the power supply; Setting the determination time; controlling whether the power supply is output and whether charging is started within the next determination time according to the magnitude and fluctuation of the solar cell voltage within the current determination time; Controlling whether the power supply in the next determination time period is output and whether charging is started according to the magnitude and fluctuation of the solar cell voltage in the current determination time period includes: Setting a charging start voltage threshold; cyclically timing the determination time; comparing the voltage of each solar cell obtained within the determination time with the charging start voltage threshold; If the voltages of the solar cells are all within the range of the charging start voltage threshold within the determination time, charging is started within the next determination time; If the voltages of the solar cells are not within the range of the charging start voltage threshold within the determination time, charging is stopped and a third control signal is output within the next determination time; the third control signal controls the power supply to be stopped; If some of the solar cell voltages are within the range of the charge start voltage threshold and some are not within the range of the charge start voltage threshold during the determination time, the charging state of the previous determination time is controlled to continue during the next determination time.

2. The photovoltaic charging control method according to claim 1, characterized in that: A startup power supply voltage threshold is set; the first condition is that the difference between the solar cell voltage and the rechargeable battery voltage is within the range of the startup power supply voltage threshold.

3. A photovoltaic charging control device, characterized in that: include: A solar cell voltage acquisition module, which is used to connect to a solar cell to acquire the solar cell voltage; A rechargeable battery voltage acquisition module, which is used to connect to the rechargeable battery to obtain the rechargeable battery voltage; a first control signal output module, which is connected to the solar cell voltage acquisition module and the rechargeable battery voltage acquisition module respectively, receives the solar cell voltage and the rechargeable battery voltage in real time, and outputs a first control signal when the solar cell voltage and the rechargeable battery voltage meet a first condition; the first condition is at least that the solar cell voltage is greater than the rechargeable battery voltage; A power supply output control module, which is connected to the rechargeable battery and the first control signal output module, and outputs power supply when receiving the first control signal; A second control signal output module, which is connected to the power supply output control module, and outputs a high-level second control signal when the power supply output control module outputs the power supply, to control the power supply output control module to lock and output the power supply; A control module, which is connected to the solar cell voltage acquisition module and the power supply output control module, and the power supply output by the power supply output control module provides a low-voltage power supply, is configured with a determination time, and is configured to obtain the solar cell voltage in real time, and control whether the power supply within the next determination time is output and whether charging is started according to the magnitude and fluctuation of the multiple solar cell voltages obtained within the determination time; The control module is configured with a charging start voltage threshold, and is configured to cycle the timing of the determination time length, and receive the solar cell voltage in real time; comparing the solar cell voltage with the charging start voltage threshold within the determination time; If the voltages of the solar cells are within the range of the charging start voltage threshold within the determination time, the control module controls the charging to start within the next determination time; If the voltages of the solar cells are not within the range of the charging start voltage threshold within the determination time, the control module controls to stop charging and outputs a third control signal within the next determination time; the third control signal controls to stop outputting the power supply; If some of the solar cell voltages are within the range of the charging start voltage threshold and some are not within the range of the charging start voltage threshold within the determination time, the control module controls to maintain the charging state of the previous determination time within the next determination time.

4. The photovoltaic charging control device according to claim 3, characterized in that: The second control signal output module is connected to the control module; when the power supply output control module outputs the power supply, the second control signal output module outputs the second control signal to the control module; The control module outputs a fourth control signal according to the second control signal, which is used to lock and control the power supply output control module to output the power supply.

5. The photovoltaic charging control device according to claim 3, characterized in that: The power supply output control module includes a second controllable switch, a third controllable switch, a fifth resistor, and a sixth resistor; the second control signal output module includes a seventh resistor and an eighth resistor; The second controllable switch is a PNP transistor; the third controllable switch is an NPN transistor; the emitter of the second controllable switch is connected to the rechargeable battery and one end of the fifth resistor; the base of the second controllable switch is connected to the other end of the fifth resistor and one end of the sixth resistor; the other end of the sixth resistor is connected to the collector of the third controllable switch; the base of the third controllable switch is connected to the first control signal output module and the control module; the emitter of the third controllable switch is grounded; the control module is configured to output the third control signal to the base of the third controllable switch; The seventh resistor and the eighth resistor are connected in series, one end of the series circuit is connected to the collector of the second controllable switch, and the other end is grounded; the common end of the seventh resistor and the eighth resistor is connected to the base of the third controllable switch.

6. The photovoltaic charging control device according to claim 4, characterized in that: The power supply output control module includes a second controllable switch, a third controllable switch, a fifth resistor, and a sixth resistor; the second control signal output module includes a seventh resistor and an eighth resistor; The second controllable switch is a PNP transistor; the third controllable switch is an NPN transistor; the emitter of the second controllable switch is connected to the rechargeable battery and one end of the fifth resistor; the base of the second controllable switch is connected to the other end of the fifth resistor and one end of the sixth resistor; the other end of the sixth resistor is connected to the collector of the third controllable switch; the base of the third controllable switch is connected to the first control signal output module and the control module; the emitter of the third controllable switch is grounded; the control module is configured to output the third control signal to the base of the third controllable switch; The seventh resistor is connected in series with the eighth resistor, one end of the series circuit is connected to the collector of the second controllable switch, and the other end is grounded; the common end of the seventh resistor and the eighth resistor is connected to the control module; the control module is configured to output the fourth control signal to the base of the third controllable switch when receiving the second control signal.

7. The photovoltaic charging control device according to claim 5 or 6, characterized in that: The first control signal output module includes a first diode, a second diode, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first controllable switch; The second diode is a voltage regulator; the first controllable switch is a PNP transistor; the positive electrode of the first diode is connected to the solar cell voltage acquisition module, and the negative electrode is connected to the negative electrode of the second diode; the positive electrode of the second diode is connected to one end of the first resistor and the emitter of the first controllable switch; the other end of the first resistor is connected to the base of the first controllable switch and one end of the second resistor; the other end of the second resistor is connected to the rechargeable battery voltage acquisition module; the third resistor is connected in series with the fourth resistor, one end of the series circuit is connected to the collector of the first controllable switch, and the other end is grounded; the common end of the third resistor and the fourth resistor is connected to the base of the third controllable switch, for outputting the first control signal to the power supply output control module.

8. A solar charging device, characterized in that: It comprises the photovoltaic charging control device as described in any one of claims 3 to 7.

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