Photovoltaic charging activation circuit and photovoltaic charging system

Abstract

The present application relates to a photovoltaic charging activation circuit and a photovoltaic charging system, the circuit includes an activation control module and a signal output module; the activation control module and the signal output module are connected in series between the photovoltaic power supply and the battery management system in sequence, and the signal output module is also connected to the power supply; the activation control module is used to output a driving signal to the signal output module when the output voltage of the photovoltaic power supply at the current moment is greater than the target voltage threshold and greater than the output voltage at the previous moment, so that the signal output module outputs an activation signal to the battery management system based on the power supply voltage of the power supply; wherein the target voltage threshold is used to characterize the minimum voltage for activating the battery management system. The use of this circuit can avoid frequent output of activation signals when the output voltage of the photovoltaic power supply fluctuates.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a photovoltaic charging activation circuit and a photovoltaic charging system. Background Art

[0002] With the rapid development of lithium battery technology and power electronics technology, integrated energy storage devices have become a market hotspot. Charging using solar energy is one of the important functions of such products, and activating charging based on the output voltage of photovoltaic power sources is particularly critical.

[0003] Existing solutions for activating charging based on the output voltage of photovoltaic power sources are relatively limited and usually have complex circuits or obvious limitations. For example, when the output voltage of the photovoltaic power source becomes unstable or jitters, it will frequently send activation signals to the battery management system. This unstable activation mechanism not only increases the energy consumption of the system and reduces the efficiency of the entire energy storage system, but also the frequent start and stop will affect the life of the battery management system. Summary of the invention

[0004] Based on this, it is necessary to provide a photovoltaic charging activation circuit and a photovoltaic charging system.

[0005] In a first aspect, the present application provides a photovoltaic charging activation circuit, including: an activation control module and a signal output module;

[0006] The activation control module and the signal output module are connected in series between the photovoltaic power source and the battery management system, and the signal output module is also connected to the power supply;

[0007] The activation control module is used to output a driving signal to the signal output module when the output voltage of the photovoltaic power source at the current moment is greater than the target voltage threshold and greater than the output voltage at the previous moment, so that the signal output module outputs an activation signal to the battery management system based on the power supply voltage of the power supply;

[0008] The target voltage threshold is used to represent the minimum voltage for activating the battery management system.

[0009] In one embodiment, the activation control module is further configured to stop outputting the driving signal when the output voltage at the current moment is less than the target voltage threshold and / or is less than or equal to the output voltage at the previous moment.

[0010] In one of the embodiments, the driving signal includes a first sub-driving signal and a second sub-driving signal, and the activation control module includes: a voltage detection unit and a step detection unit;

[0011] The first input end of the voltage detection unit is used to connect to the photovoltaic power source, and the first output end of the voltage detection unit is connected to the first input end of the signal output module;

[0012] The step detection unit is connected in series between the second output terminal of the voltage detection unit and the second input terminal of the signal output module;

[0013] The voltage detection unit is used to output an intermediate voltage signal to the step detection unit and output a first sub-driving signal to the signal output module when the output voltage of the photovoltaic power source at the current moment is greater than the target voltage threshold; the intermediate voltage signal is positively correlated with the output voltage;

[0014] The step detection unit is used to output a second sub-driving signal to the signal output module when the intermediate voltage signal at the current moment is greater than the intermediate voltage signal at the previous moment, so that the signal output module outputs an activation signal when receiving the first sub-driving signal and the second sub-driving signal.

[0015] In one embodiment, the voltage detection unit is further configured to stop outputting the intermediate voltage signal and the first sub-driving signal when the output voltage at the current moment is less than the target voltage threshold; and / or,

[0016] The step detection unit is further configured to stop outputting the second sub-driving signal when the intermediate voltage signal at the current moment is less than or equal to the intermediate voltage signal at the previous moment.

[0017] In one of the embodiments, the output terminal of the step detection unit is also connected to the second input terminal of the voltage detection unit;

[0018] The voltage detection unit is further configured to continuously output the first sub-driving signal when receiving the second sub-driving signal.

[0019] In one of the embodiments, the step detection unit includes: a switch circuit, a first charge-discharge circuit, and a second charge-discharge circuit;

[0020] The input end of the switch circuit is connected to the second output end of the voltage detection unit, the first output end of the switch circuit is connected to the input end of the first charge and discharge circuit, the second output end of the switch circuit is connected to the input end of the second charge and discharge circuit, and the discharge controlled end of the first charge and discharge circuit is connected to the second output end of the voltage detection unit; the output end of the second charge and discharge circuit is connected to the second input end of the signal output module, or the output end of the second charge and discharge circuit is respectively connected to the second input end of the signal output module and the second input end of the voltage detection unit;

[0021] The switch circuit is turned on when the voltage difference between the input terminal of the switch circuit and the first output terminal meets the conduction condition, and charges the first charge-discharge circuit and the second charge-discharge circuit, so that the second charge-discharge circuit outputs the second sub-driving signal;

[0022] When the voltage difference does not satisfy the conduction condition, the switch circuit is turned off to discharge the first charge-discharge circuit and the second charge-discharge circuit.

[0023] In one embodiment, the switch circuit includes: a switch tube Q1; the emitter of the switch tube Q1 is connected to the second output end of the voltage detection unit, the collector of the switch tube is connected to the second input end of the signal output module, and the base of the switch tube Q1 is connected to the input end of the first charge and discharge circuit; and / or,

[0024] The first charge and discharge circuit comprises: a resistor R2, a capacitor C1, a diode D1 and a resistor R1; the resistor R2, an anode of the diode D1, a cathode of the diode D1 and the resistor R1 are sequentially connected in series between the first output terminal of the switch circuit and the ground terminal, and the capacitor C1 is connected in parallel with the resistor R1; and / or,

[0025] The second charge-discharge circuit includes: a capacitor C2 and a resistor R3; the capacitor C2 and the resistor R3 are connected in parallel between the second output terminal of the switch circuit and the ground terminal.

[0026] In one embodiment, the voltage detection unit includes: a voltage stabilizing diode ZD1, a switch tube Q4 and a switch tube Q5;

[0027] The cathode of the Zener diode ZD1 is used to connect to the photovoltaic power supply, the anode of the Zener diode ZD1 is respectively connected to the collector of the switch tube Q4 and the base of the switch tube Q5, the emitter of the switch tube Q4 is connected to the output end of the step detection unit, the base of the switch tube Q4 is connected to the collector of the switch tube Q5, and the emitter of the switch tube Q5 is grounded.

[0028] In one embodiment, the signal output module includes: a switch tube Q6, a resistor R9, a switch tube Q3, a resistor R5, a capacitor C4, a switch tube Q2, a resistor R4 and a capacitor C3;

[0029] The emitter of the switch tube Q6 is used to connect to the power supply, the base of the switch tube Q6 is connected to the first output end of the voltage detection unit, and the collector of the switch tube Q6 is connected to the emitter of the switch tube Q3;

[0030] The resistor R9 is connected between the emitter and the base of the switch tube Q6;

[0031] The collector of the switch tube Q3 is used to connect to the battery management system, and the resistor R5 and the capacitor C4 are connected in series to the base of the switch tube Q3 and the ground terminal in sequence;

[0032] The resistor R4 and the capacitor C3 are connected in series between the output terminal and the ground terminal of the step detection unit in sequence;

[0033] The collector of the switch tube Q2 is connected between the resistor R5 and the capacitor C4, the emitter of the switch tube Q2 is grounded, and the base of the switch tube Q2 is connected between the resistor R4 and the capacitor C3.

[0034] In a second aspect, the present application also provides a photovoltaic charging system, the photovoltaic charging system comprising:

[0035] Photovoltaic power source;

[0036] Battery management system;

[0037] And the photovoltaic charging activation circuit as in the above embodiment, wherein the photovoltaic charging activation circuit is connected to the photovoltaic power source and the battery management system respectively.

[0038] The above photovoltaic charging activation circuit and photovoltaic charging system have at least the following beneficial effects:

[0039] By setting up an activation control module, the output voltage of the photovoltaic power source is sampled in real time, and the driving signal is output to the signal output module only when the voltage is not only higher than the minimum voltage for activating the battery management system, but also higher than the voltage at the previous moment. That is, the charging process will be activated only when the photovoltaic power source truly provides stable and continuously increasing energy, thereby reducing the number of invalid starts, achieving reliable activation, and further reducing the energy consumption of the system, improving the charging efficiency, and extending the service life of the energy storage equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 It is one of the structural schematic diagrams of a photovoltaic charging activation circuit in one embodiment;

[0042] Figure 2 This is a second structural schematic diagram of a photovoltaic charging activation circuit in one embodiment;

[0043] Figure 3 This is a third structural schematic diagram of a photovoltaic charging activation circuit in one embodiment;

[0044] Figure 4 This is a fourth structural schematic diagram of a photovoltaic charging activation circuit in one embodiment;

[0045] Figure 5 This is a fifth structural diagram of a photovoltaic charging activation circuit in one embodiment;

[0046] Figure 6 This is a sixth structural diagram of a photovoltaic charging activation circuit in one embodiment;

[0047] Figure 7 This is a seventh structural diagram of a photovoltaic charging activation circuit in one embodiment;

[0048] Figure 8 This is the eighth structural schematic diagram of a photovoltaic charging activation circuit in an embodiment. DETAILED DESCRIPTION

[0049] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0051] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0052] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0053] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0054] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0055] In an exemplary embodiment, Figure 1 As shown, the present application provides a photovoltaic charging activation circuit, including an activation control module 2 and a signal output module 4. The activation control module 2 and the signal output module 4 are connected in series between the photovoltaic power source 300 and the battery management system 500 in sequence, and the signal output module 4 is also connected to the power supply 700; the activation control module 2 is used to output a driving signal to the signal output module 4 when the output voltage of the photovoltaic power source 300 at the current moment is greater than the target voltage threshold and greater than the output voltage at the previous moment, so that the signal output module 4 outputs an activation signal to the battery management system 500 based on the power supply voltage of the power supply 700; wherein the target voltage threshold is used to represent the minimum voltage for activating the battery management system 500.

[0056] For example, the output characteristic of a photovoltaic power source is that its output voltage changes with the intensity of light. When the light conditions change, such as when clouds block the sun or shadows block the sun, the output voltage of the photovoltaic power source (such as a solar panel) will be unstable or jittery. In a photovoltaic charging system that activates charging based on the output voltage of the photovoltaic power source, when the output voltage of the photovoltaic power source exceeds the minimum voltage requirement for activating the battery management system, the photovoltaic charging system will assume that there is enough energy to supply power and will send an activation signal to the battery management system (BMS) to start the charging process. However, if the output voltage of the photovoltaic power source fluctuates frequently due to environmental factors, the output voltage may repeatedly cross the minimum voltage for activating the battery management system, that is, whenever the output voltage of the photovoltaic power source is higher than the minimum voltage for activating the battery management system, the photovoltaic charging system will try to activate charging; and when the output voltage of the photovoltaic power source is lower than the minimum voltage for activating the battery management system, the photovoltaic charging system will stop charging. Such frequent starts and stops will not only increase energy consumption, but also reduce charging efficiency and the life of energy storage equipment.

[0057] Based on the above reasons, Figure 1As shown, the activation control module 2 is set to sample and record the change of the output voltage of the photovoltaic power supply 300 in real time, and only when the output voltage of the photovoltaic power supply 300 at the current moment is greater than the minimum voltage for activating the battery management system 500 and greater than the output voltage at the previous moment, the drive signal is output to the signal output module 4, so that the signal output module 4 outputs the activation signal to the battery management system 500 based on the power supply voltage of the power supply 700. Specifically, when the output voltage of the photovoltaic power supply 300 at the current moment is less than or equal to the minimum voltage for activating the battery management system 500, it means that the output voltage at this moment does not meet the minimum voltage requirement for activating the battery management system 500, and the activation control module 2 will not output the drive signal to enable the signal output module 4 to activate the battery management system 500; when the output voltage of the photovoltaic power supply 300 at the current moment is greater than the minimum voltage for activating the battery management system 500 but less than the output voltage at the previous moment, it means that the output voltage of the photovoltaic power supply 300 at this moment may have a downward trend in a continuous time period, and the energy provided by the photovoltaic power supply 300 may not be stable. At this time, the activation control module 2 will not output the drive signal to enable the signal output module 4 to activate the battery management system 500. The activation control module 2 will not output a driving signal; when the output voltage of the photovoltaic power source 300 at the current moment is greater than the minimum voltage for activating the battery management system 500, and greater than the output voltage at the previous moment, it means that the output voltage of the photovoltaic power source 300 at this moment meets the minimum voltage requirement for activating the battery management system 500, and has a continuous upward trend in a continuous period of time, and the energy provided by the photovoltaic power source 300 is sufficient and stable, and the activation control module 2 will output a driving signal to the signal output module 4, so that the signal output module 4 outputs an activation signal to the battery management system 500 based on the power supply voltage of the power supply 700 to activate the battery management system 500. It should be noted that for the case of the output voltage of the photovoltaic power source 300 being connected for the first time, since the output voltage at the previous moment is zero, as long as the output voltage at the current moment is greater than the minimum voltage for activating the battery management system 500, the activation control module 2 will output a driving signal to the signal output module 4 to activate the battery management system 500.

[0058] Among them, the sampling frequency of the output voltage of the photovoltaic power source 300 by the activation control module 2 can be set according to the actual activation accuracy requirements, which is not limited here. For example, if you want to reduce the activation frequency as much as possible, you can reduce the sampling frequency (that is, increase the sampling time interval between the current moment and the previous moment) so that the energy provided by the photovoltaic power source 300 remains stable for a longer continuous period of time and has a trend of continuous growth, and then the charging process is activated.

[0059] The above photovoltaic charging activation circuit samples the output voltage of the photovoltaic power source in real time by setting an activation control module, and outputs a driving signal to the signal output module only when the voltage is not only higher than the minimum voltage for activating the battery management system, but also higher than the voltage at the previous moment. That is, the charging process will be activated only when the photovoltaic power source truly provides stable and continuously increasing energy, thereby reducing the number of invalid starts, achieving reliable activation, and further reducing the energy consumption of the system, improving the charging efficiency, and extending the service life of the energy storage equipment.

[0060] In an exemplary embodiment, the power supply 700 may be a power supply provided by a battery module in an energy storage device. For another example, the power supply 700 may be another power supply other than a battery module.

[0061] In an exemplary embodiment, the activation control module 2 is further configured to stop outputting the driving signal when the output voltage at the current moment is less than the target voltage threshold and / or is less than or equal to the output voltage at the previous moment.

[0062] Exemplarily, as described above, when the output voltage of the photovoltaic power source 300 at the current moment is less than or equal to the minimum voltage for activating the battery management system 500, it means that the output voltage at this moment does not meet the minimum voltage requirement for activating the battery management system 500, and the activation control module 2 will not output a drive signal to enable the signal output module 4 to activate the battery management system 500; when the output voltage of the photovoltaic power source 300 at the current moment is greater than the minimum voltage for activating the battery management system 500 but less than the output voltage at the previous moment, it means that the output voltage at this moment may have a downward trend in a continuous time period, and the energy provided by the photovoltaic power source 300 may not be stable, and the activation control module 2 will not output a drive signal at this time. Based on this, during the activation process of the battery management system 500, when the output voltage at the current moment is less than the target voltage threshold, and / or less than or equal to the output voltage at the previous moment, it is necessary to stop outputting the drive signal at this time to stop the battery management system 500 from working.

[0063] In this embodiment, the activation control module can also stop outputting the drive signal when the output voltage at the current moment is less than the target voltage threshold, and / or less than or equal to the output voltage at the previous moment, to ensure that charging is only performed when the energy provided by the photovoltaic power source is stable and continuously increasing during the entire charging process, thereby improving the charging efficiency. At the same time, the activation signal will not be output continuously during the photovoltaic power supply process, ensuring that the battery management system 500 can be shut down and powered off.

[0064] In an exemplary embodiment, Figure 2As shown, the driving signal includes a first sub-driving signal and a second sub-driving signal, and the activation control module 2 includes a voltage detection unit 22 and a step detection unit 24. The first input end of the voltage detection unit 22 is used to connect the photovoltaic power source 300, and the first output end of the voltage detection unit 22 is connected to the first input end of the signal output module 4; the step detection unit 24 is connected in series between the second output end of the voltage detection unit 22 and the second input end of the signal output module 4. The voltage detection unit 22 is used to output an intermediate voltage signal to the step detection unit 24 and output a first sub-driving signal to the signal output module 4 when the output voltage of the photovoltaic power source 300 at the current moment is greater than the target voltage threshold; the intermediate voltage signal is positively correlated with the output voltage; the step detection unit 24 is used to output a second sub-driving signal to the signal output module 4 when the intermediate voltage signal at the current moment is greater than the intermediate voltage signal at the previous moment, so that the signal output module 4 outputs an activation signal when receiving the first sub-driving signal and the second sub-driving signal.

[0065] The voltage detection unit 22 is used to detect whether the output voltage of the photovoltaic power source 300 is greater than the target voltage threshold, that is, to determine whether the output voltage of the photovoltaic power source 300 is greater than the minimum voltage for activating the battery management system 500. The step detection unit 24 can receive and store the voltage output by the voltage detection unit 22, and is used to detect whether the voltage output by the voltage detection unit 22 at the current moment is compared with the voltage output by the voltage detection unit 22 at the previous moment.

[0066] Exemplarily, the output voltage of the photovoltaic power source 300 is input to the voltage detection unit 22. The voltage detection unit 22 compares the output voltage of the photovoltaic power source 300 received at the current moment with the minimum voltage for activating the battery management system 500. When the output voltage of the photovoltaic power source 300 at the current moment is greater than the minimum voltage for activating the battery management system 500, it indicates that the output voltage of the photovoltaic power source 300 at this moment meets the minimum voltage requirement for activating the battery management system 500. The voltage detection unit 22 outputs the first sub-driving signal to the signal output module 4 based on the comparison result. At the same time, the voltage detection unit 22 also converts the output voltage of the photovoltaic power source 300 at the current moment into an intermediate voltage signal to the step detection unit 24. After receiving the intermediate voltage signal, the step detection unit 24 compares it with the intermediate voltage signal of the previous moment stored in the step detection unit 24. When the intermediate voltage signal at the current moment is greater than the intermediate voltage signal of the previous moment, it indicates that the output voltage of the photovoltaic power source 300 at this moment has a trend of continuous increase in a continuous time period, and the energy provided by the photovoltaic power source 300 is sufficient and stable. The step detection unit 24 outputs the second sub-driving signal to the signal input module. When the signal output module 4 receives the first sub-driving signal and the second sub-driving signal at the same time, the signal output module 4 outputs an activation signal to the battery management system 500 based on the power supply voltage of the power supply 700 to complete the activation operation.

[0067] In this embodiment, a voltage detection unit and a step detection unit are introduced to jointly determine the state of the photovoltaic power supply output voltage, thereby ensuring that the battery management system is activated only when the voltage is not only higher than a preset threshold but also has a continuous upward trend. This helps to avoid false activation due to voltage fluctuations, thereby improving the stability and reliability of the system operation, extending the service life of the battery management system, and ensuring the effective use of the photovoltaic system energy.

[0068] In an exemplary embodiment, the voltage detection unit 22 is also used to stop outputting the intermediate voltage signal and the first sub-drive signal when the output voltage at the current moment is less than the target voltage threshold; and / or the jump detection unit is also used to stop outputting the second sub-drive signal when the intermediate voltage signal at the current moment is less than or equal to the intermediate voltage signal at the previous moment.

[0069] Exemplarily, when the output voltage detected by the voltage detection unit 22 at the current moment is less than the target voltage threshold, it means that the output voltage of the photovoltaic power supply 300 at this moment does not meet the minimum voltage requirement for activating the battery management system 500, and the output of the intermediate voltage signal and the first sub-drive signal is immediately stopped. Secondly, even if the output voltage at the current moment is greater than the target voltage threshold, and the step detection unit 24 detects that the intermediate voltage signal at the current moment is less than or equal to the intermediate voltage signal at the previous moment, it means that even if the output voltage of the photovoltaic power supply 300 at the current moment meets the minimum requirement for activating the battery management system 500, the output voltage of the photovoltaic power supply 300 may have a downward trend in a continuous time period, and the energy provided by the photovoltaic power supply 300 may not be stable, and the step detection unit will stop outputting the second sub-drive signal.

[0070] In this embodiment, by setting a mechanism to stop outputting the drive signal when the output voltage of the photovoltaic power supply is lower than the target threshold and / or the output voltage of the photovoltaic power supply has no upward trend, the battery management system is effectively prevented from being mistakenly activated due to unstable or insufficient voltage, thereby ensuring the safety and efficiency of the system operation, reducing unnecessary energy consumption, and enhancing the reliability and stability of the entire photovoltaic system.

[0071] In an exemplary embodiment, Figure 3 As shown, the output end of the step detection unit 24 is also connected to the second input end of the voltage detection unit 22; the voltage detection unit 22 is also used to continuously output the first sub-driving signal when receiving the second sub-driving signal.

[0072] Exemplarily, once the step detection unit 24 confirms that the output voltage of the photovoltaic power source 300 has a trend of continuously rising, it outputs the second sub-drive signal. The voltage detection unit 22 receives the second sub-drive signal through the second input terminal and continuously outputs the first sub-drive signal to ensure that after detecting suitable and stable activation conditions, the first sub-drive signal is stably output. Based on this, it acts together with the second sub-drive signal on the signal output module 4 to ensure that the signal output module 4 can uninterruptedly maintain the generation of the activation signal, thereby ensuring that the battery management system 500 is stably activated and avoiding problems such as unstable system operation or reactivation due to signal interruption.

[0073] In an exemplary embodiment, Figure 4As shown, the step detection unit 24 includes a switch circuit 242, a first charge-discharge circuit 244, and a second charge-discharge circuit 246. The input end of the switch circuit 242 is connected to the second output end of the voltage detection unit 22, the first output end of the switch circuit 242 is connected to the input end of the first charge-discharge circuit 244, the second output end of the switch circuit 242 is connected to the input end of the second charge-discharge circuit 246, the discharge controlled end of the first charge-discharge circuit 244 is connected to the second output end of the voltage detection unit 22; the output end of the second charge-discharge circuit 246 is connected to the second input end of the signal output module 4, or the output end of the second charge-discharge circuit 246 is connected to the second input end of the signal output module 4 and the second input end of the voltage detection unit 22, respectively. The switch circuit 242 is turned on when the voltage difference between the input terminal and the first output terminal of the switch circuit 242 meets the conduction condition, and charges the first charge and discharge circuit 244 and the second charge and discharge circuit 246, so that the second charge and discharge circuit 246 outputs the second sub-driving signal; the switch circuit 242 is turned off when the voltage difference does not meet the conduction condition, so that the first charge and discharge circuit 244 and the second charge and discharge circuit 246 discharge.

[0074] The conduction condition may refer to that the voltage difference between the input terminal and the first output terminal of the switch circuit 242 is greater than a preset voltage threshold. The specific preset voltage threshold may be set according to the actual circuit design and is not limited here.

[0075] Exemplarily, when the output voltage of the photovoltaic power source 300 is first connected, if the output voltage of the photovoltaic power source 300 is greater than the target voltage threshold, the voltage detection unit 22 outputs the intermediate voltage signal to the input end of the switch circuit 242. Since the voltage provided by the intermediate voltage signal is relatively large at this time, the voltage provided to the output end of the switch circuit 242 is also relatively large; and when the output voltage of the photovoltaic power source 300 is first connected, since the first charge and discharge circuit 244 has not been charged before, the voltage provided to the first output end of the switch circuit 242 by the first charge and discharge circuit 244 is relatively small (almost zero). Therefore, when the output voltage of the photovoltaic power source 300 is first connected, as long as the output voltage of the photovoltaic power source 300 is greater than the target voltage threshold, the voltage difference between the input end and the first output end of the switch circuit 242 satisfies the conduction condition, so that the switch circuit 242 is turned on, and the intermediate voltage signal charges the first charge and discharge circuit 244 and the second charge and discharge circuit 246 through the switch circuit 242. When the second charge and discharge circuit 246 has been charged for a certain period of time and the voltage reaches a certain value, it starts to output the second sub-driving signal to the signal output module 4. Wherein, when the output end of the second charge and discharge circuit 246 is respectively connected to the second input end of the signal output module 4 and the second input end of the voltage detection unit 22, the second sub-driving signal output by the second charge and discharge circuit 246 can also be output to the voltage detection unit 22, so that the voltage detection unit 22 continues to output the first sub-driving signal. When the first charge and discharge circuit 244 is fully charged, since the voltage provided by the first charge and discharge circuit 244 to the first output end of the switch circuit 242 is equal to the voltage of the input end of the switch circuit 242 (that is, the voltage of the input end of the switch circuit 242 and the voltage of the first output end of the switch circuit 242 are both the voltages provided by the intermediate voltage signal), the switch circuit 242 is turned off because the voltage difference between its input end and the first output end cannot meet the conduction condition, and the second charge and discharge circuit 246 starts to discharge, and the voltage gradually decreases until the second sub-driving signal stops being output. Since the discharge controlled end of the first charge and discharge circuit 244 is connected to the second output end of the voltage detection unit 22, the voltage at the discharge end of the first charge and discharge circuit 244 is equal to the voltage provided by the intermediate voltage signal. Therefore, the first charge and discharge circuit 244 cannot discharge at this time and still maintains the voltage provided by the intermediate voltage signal, keeping the switch circuit 242 in the cut-off state to avoid the early discharge of the first charge and discharge circuit 244 and causing the switch tube to be frequently turned on, so that the second charge and discharge circuit 246 frequently outputs the second sub-driving signal to the signal output module 4.

[0076] When the output voltage of the photovoltaic power source 300 at the next moment (compared to the next moment when the output voltage of the photovoltaic power source 300 is first connected) is greater than the target voltage threshold and greater than the output voltage when the photovoltaic power source 300 is first connected, the voltage detection unit 22 outputs the intermediate voltage signal to the input end of the switch circuit 242. As described above, since when the first charge and discharge circuit 244 is fully charged, the voltage at the input end of the switch circuit 242 and the voltage at the first output end of the switch circuit 242 are both equal to the voltage provided by the intermediate voltage signal, therefore, in order to make the voltage difference between the input end and the first output end of the switch circuit 242 meet the conduction condition again, the intermediate voltage signal output at this time (next moment) must at least meet the intermediate voltage signal output when the output voltage of the photovoltaic power source 300 is first connected. Since the output voltage of the photovoltaic power source 300 at the next moment is greater than the output voltage when the photovoltaic power source 300 is first connected, that is, the intermediate voltage signal output at the next moment is also greater than the intermediate voltage signal output when it is first connected, the switch circuit 242 is turned on again, and the intermediate voltage signal charges the first charge and discharge circuit 244 and the second charge and discharge circuit 246 through the switch circuit 242. When the second charge and discharge circuit 246 has been charged for a certain period of time and the voltage reaches a certain value, the second sub-driving signal is output.

[0077] When the output voltage of the photovoltaic power source 300 at the next moment (compared to the next moment when the output voltage of the photovoltaic power source 300 is first connected) is greater than the target voltage threshold, but less than the output voltage when the photovoltaic power source 300 is first connected, the intermediate voltage signal output at the next moment is also less than the intermediate voltage signal output when it is first connected, and the voltage difference between the input end and the first output end of the switch circuit 242 does not meet the conduction condition, the switch circuit 242 is turned off, and the second charge and discharge circuit 246 starts to discharge until the second sub-driving signal stops being output. At the same time, since the intermediate voltage signal output at the next moment is smaller than the intermediate voltage signal output at the initial connection, that is, the voltage of the controlled end discharged by the first charge and discharge circuit 244 at the next moment is smaller than the voltage when the first charge and discharge circuit 244 is fully charged, the first charge and discharge circuit 244 starts to discharge at this time until the voltage of the first charge and discharge circuit 244 drops to be equal to the voltage of the controlled end discharged by the first charge and discharge circuit 244, so that when the output voltage of the photovoltaic power supply 300 is greater than the "output voltage of the photovoltaic power supply 300 at the next moment" next time, the switch circuit 242 can be turned on again to charge the second charge and discharge circuit 246 to output the second sub-driving signal.

[0078] In this embodiment, through the design of the switching circuit and two charging and discharging circuits (the first charging and discharging circuit and the second charging and discharging circuit), the changing trend of the output voltage of the photovoltaic power supply can be judged more accurately, and whether to activate the battery management system can be decided accordingly. It can not only ensure that the battery management system is activated when the output voltage of the photovoltaic power supply continues to rise, thereby avoiding the problem of false activation caused by instantaneous voltage fluctuations, but also effectively prevent the frequent conduction and cutoff of the switching circuit through the controlled discharge mechanism of the first charging and discharging circuit, avoiding the frequent output of the second sub-driving signal by the second charging and discharging circuit that may be caused by this, thereby protecting the circuit from unnecessary stress damage and extending the service life of the equipment.

[0079] In an exemplary embodiment, Figure 5 As shown, the switch circuit 242 includes a switch tube Q1; the emitter of the switch tube Q1 is connected to the second output end of the voltage detection unit 22, the collector of the switch tube is connected to the second input end of the signal output module 4, and the base of the switch tube Q1 is connected to the input end of the first charge and discharge circuit 244; and / or, the first charge and discharge circuit 244 includes: a resistor R2, a capacitor C1, a diode D1 and a resistor R1; the resistor R2, the anode of the diode D1, the cathode of the diode D1 and the resistor R1 are connected in series between the first output end and the ground end of the switch circuit 242 in sequence, the cathode of the diode D1 is also connected to the second output end of the voltage detection unit 22, and the capacitor C1 is connected in parallel with the resistor R1; and / or, the second charge and discharge circuit 246 includes: a capacitor C2 and a resistor R3; the capacitor C2 and the resistor R3 are connected in parallel between the second output end and the ground end of the switch circuit 242.

[0080] The switch tube Q1 may be a PNP transistor.

[0081] Exemplarily, when the output voltage of the photovoltaic power source 300 is first connected, if the output voltage of the photovoltaic power source 300 is greater than the target voltage threshold, the voltage detection unit 22 outputs the intermediate voltage signal to the emitter of the switch tube Q1. Since the voltage provided by the intermediate voltage signal is relatively large at this time, the voltage provided to the emitter of the switch tube Q1 is also relatively large; and when the output voltage of the photovoltaic power source 300 is first connected, since the capacitor C1 has not been charged before, the voltage provided by the capacitor C1 to the base of the switch tube Q1 is relatively small (almost zero). Therefore, when the output voltage of the photovoltaic power source 300 is first connected, as long as the output voltage of the photovoltaic power source 300 is greater than the target voltage threshold, the voltage difference between the emitter and the base of the switch tube Q1 satisfies the conduction condition, so that the switch tube Q1 is turned on, and the intermediate voltage signal charges the capacitor C1 and the capacitor C2 through the switch tube Q1. When the capacitor C2 has been charged for a certain time and the voltage reaches a certain value, the second sub-driving signal starts to be output to the signal output module 4. Wherein, when the capacitor C2 is connected to the second input terminal of the signal output module 4 and the second input terminal of the voltage detection unit 22 respectively, the second sub-driving signal output by the capacitor C2 can also be output to the voltage detection unit 22, so that the voltage detection unit 22 continues to output the first sub-driving signal. When the capacitor C1 is fully charged, since the voltage provided by the capacitor C1 to the base of the switch tube Q1 is equal to the voltage of the emitter of the switch tube Q1 (that is, the voltage of the emitter of the switch tube Q1 and the voltage of the base of the switch tube Q1 are both the voltages provided by the intermediate voltage signal), the switch tube Q1 is turned off because the voltage difference between its emitter and base cannot meet the conduction condition, and the capacitor C2 begins to discharge through the resistor R3, and the voltage gradually decreases until the second sub-driving signal stops being output. Since the cathode of the diode D1 is also connected to the second output end of the voltage detection unit 22, the voltage at the cathode of the diode D1 is equal to the voltage provided by the intermediate voltage signal. Therefore, the capacitor C1 cannot be discharged at this time and still maintains the voltage provided by the intermediate voltage signal, keeping the switch tube Q1 in the cut-off state to avoid the early discharge of the capacitor C1 and causing the switch tube Q1 to be frequently turned on, so that the capacitor C2 frequently outputs the second sub-driving signal to the signal output module 4.

[0082] When the output voltage of the photovoltaic power source 300 at the next moment (compared to the next moment when the output voltage of the photovoltaic power source 300 is first connected) is greater than the target voltage threshold and greater than the output voltage when the photovoltaic power source 300 is first connected, the voltage detection unit 22 outputs the intermediate voltage signal to the emitter of the switch tube Q1. As described above, since the voltage of the emitter of the switch tube Q1 and the voltage of the base of the switch tube Q1 are both equal to the voltage provided by the intermediate voltage signal when the capacitor C1 is fully charged, in order to make the voltage difference between the emitter and the base of the switch tube Q1 meet the conduction condition again, the intermediate voltage signal output at this time (next moment) must at least meet the intermediate voltage signal output when the output voltage of the photovoltaic power source 300 is first connected. Since the output voltage of the photovoltaic power source 300 at the next moment is greater than the output voltage when the photovoltaic power source 300 is first connected, that is, the intermediate voltage signal output at the next moment is also greater than the intermediate voltage signal output when it is first connected, the switch tube Q1 is turned on again, and the intermediate voltage signal charges the capacitor C1 and the capacitor C2 through the switch tube Q1. When the capacitor C2 has been charged for a certain period of time and the voltage reaches a certain value, the second sub-driving signal is output.

[0083] When the output voltage of the photovoltaic power source 300 at the next moment (compared to the next moment of the output voltage when the photovoltaic power source 300 is first connected) is greater than the target voltage threshold, but less than the output voltage when the photovoltaic power source 300 is first connected, the intermediate voltage signal output at the next moment is also less than the intermediate voltage signal output when the photovoltaic power source 300 is first connected, and the voltage difference between the emitter and the base of the switch tube Q1 does not meet the conduction condition, the switch tube Q1 is turned off, and the capacitor C2 starts to discharge through the resistor R3 until the second sub-driving signal stops being output. At the same time, since the intermediate voltage signal output at the next moment is less than the intermediate voltage signal output when the photovoltaic power source 300 is first connected, that is, the voltage of the cathode of the diode D1 at the next moment is less than the full voltage of the capacitor C1 when the photovoltaic power source 300 is first connected, at this time, the capacitor C1 starts to discharge through the resistor R1 until the voltage of the capacitor C1 drops to be equal to the voltage of the cathode of the diode D1, so that when the output voltage of the photovoltaic power source 300 is greater than the "output voltage of the photovoltaic power source 300 at the next moment", the switch tube Q1 can be turned on again to charge the capacitor C2 to output the second sub-driving signal.

[0084] In this embodiment, the charging process of capacitors C1 and C2 is controlled by the switch tube Q1, so that when the photovoltaic power supply voltage increases steadily, the second sub-driving signal can be stably output, so that the battery management system is continuously activated. At the same time, by limiting the discharge condition of capacitor C1, the frequent on and off of the switch tube Q1 is avoided, the risk of misoperation caused by voltage fluctuations is reduced, the stability and reliability of the system are enhanced, and the efficient operation of the photovoltaic system when the battery management system is activated is ensured, and the additional energy consumption and potential hardware damage risks caused by frequent activation are reduced.

[0085] In an exemplary embodiment, Figure 6 As shown, the voltage detection unit 22 includes a voltage stabilizing diode ZD1, a switch tube Q4 and a switch tube Q5. The cathode of the voltage stabilizing diode ZD1 is used to connect to the photovoltaic power source 300, the anode of the voltage stabilizing diode ZD1 is connected to the collector of the switch tube Q4 and the base of the switch tube Q5 respectively, the emitter of the switch tube Q4 is connected to the output end of the step detection unit 24, the base of the switch tube Q4 is connected to the collector of the switch tube Q5, and the emitter of the switch tube Q5 is grounded.

[0086] The switch tube Q4 may be a PNP transistor; the switch tube Q5 may be an NPN transistor; in order to meet the circuit design requirements, the voltage detection unit 22 further includes a resistor R7 and a resistor R6. The specific connection relationship can be referred to Figure 6 The voltage zener diode ZD1 and the resistor R7 are used to set the target voltage threshold, below which the battery management system 500 cannot be activated; the resistor R6 is a current limiting resistor, which limits the output voltage of the photovoltaic power source 300 flowing through the current of the base of the switch tube Q4 and the switch tube Q5.

[0087] Exemplarily, when the output voltage of the photovoltaic power source 300 (i.e., the PV_IN voltage) is greater than the reverse breakdown voltage of the Zener diode ZD1, the Zener diode ZD1 is turned on, and the current flows through the resistor R7 and the base of the switch tube Q5, the switch tube Q5 is turned on, and the first sub-driving signal (i.e., the WAKE_UP0 signal) is output. Wherein, when the switch tube Q4 is connected to the output end of the step detection unit 24 through the resistor R6, since the switch tube Q5 and the switch tube Q4 are thyristor structures, under the action of the second sub-driving signal (i.e., the PV_IN0 signal) output by the step detection unit 24, the switch tube Q4 is turned on, and the PV_IN0 voltage pumps the base of the switch tube Q5 high, ensuring that the switch tube Q5 is reliably turned on, that is, continuously outputting the effective first sub-driving signal (the WAKE_UP0 signal is low level effective).

[0088] In this embodiment, when the output voltage of the photovoltaic power source exceeds the target voltage threshold, the voltage zener diode ZD1 is turned on, triggering the switch tube Q5 to output the first sub-drive signal (WAKE_UP0 signal), and under the action of the second sub-drive signal (PV_IN0 signal) output by the step detection unit, the switch tube Q4 is ensured to be turned on, further consolidating the output of the first sub-drive signal, thereby ensuring that the battery management system will only be activated when the photovoltaic power source provides sufficient and stable voltage, reducing unnecessary activation attempts.

[0089] In an exemplary embodiment, Figure 7As shown, the signal output module 4 includes a switch tube Q6, a resistor R9, a switch tube Q3, a resistor R5, a capacitor C4, a switch tube Q2, a resistor R4 and a capacitor C3. The emitter of the switch tube Q6 is used to connect to the power supply 700, the base of the switch tube Q6 is connected to the first output end of the voltage detection unit 22, and the collector of the switch tube Q6 is connected to the emitter of the switch tube Q3; the resistor R9 is connected between the emitter and the base of the switch tube Q6; the collector of the switch tube Q3 is used to connect to the battery management system 500, the resistor R5 and the capacitor C4 are connected in series to the base and the ground end of the switch tube Q3 in sequence; the resistor R4 and the capacitor C3 are connected in series between the output end and the ground end of the step detection unit 24 in sequence; the collector of the switch tube Q2 is connected between the resistor R5 and the capacitor C4, the emitter of the switch tube Q2 is grounded, and the base of the switch tube Q2 is connected between the resistor R4 and the capacitor C3.

[0090] The switch tube Q6 and the switch tube Q3 can be PNP transistors; the switch tube Q2 can be an NPN transistor. In order to meet the circuit design requirements, the voltage detection unit 22 also includes a resistor R8 and a resistor R10. The specific connection relationship can be referred to Figure 7 As shown, no further details are given here.

[0091] Exemplarily, when the output voltage of the photovoltaic power supply 300 at the current moment is greater than the target voltage threshold and greater than the output voltage at the previous moment, the voltage detection unit 22 outputs a valid first sub-drive signal to the signal output module 4, and the step detection unit 24 outputs a second sub-drive signal to the signal output module 4 and the voltage detection unit 22. When the voltage detection unit 22 receives the second sub-drive signal, it continues to output a valid first sub-drive signal. After the signal output module 4 receives the first sub-drive signal output by the voltage detection unit 22, the switch tube Q6 and the switch tube Q3 are turned on; after the signal output module 4 receives the second sub-drive signal, the second sub-drive signal flows through the resistor R4 through the capacitor C3 and the base of the switch tube Q2, and the switch tube Q2 is turned on. The current of the power supply 700 flows to the ground terminal through the current limiting resistor R10, the emitter and collector of the switch tube Q6, the emitter and base of the switch tube Q3, the resistor R5, the collector and emitter of the switch tube Q2, and at this time, a valid output activation signal (that is, WAKE_UP is high level) is output to the battery management system 500.

[0092] When the step detection unit 24 stops outputting the second sub-driving signal, the switch tube Q2 is turned off, and the current of the power supply 700 charges the capacitor C4 through the current limiting resistor R10, the emitter and collector of the switch tube Q6, the emitter and base of the switch tube Q3, and the resistor R5. After the capacitor C4 is full, the switch tube Q3 is turned off and stops outputting the activation signal (i.e., WAKE_UP is at a low level) to the battery management system 500.

[0093] Among them, when the voltage detection unit 22 stops outputting the first sub-driving signal (such as the output voltage of the photovoltaic power supply 300 at the current moment is less than the target voltage threshold), the base voltage of the switch tube Q6 in the signal output module 4 is pulled up to the voltage of the power supply 700 by the resistor R9, the switch tube Q6 is turned off, and the switch tube Q3 is also turned off. At this time, the activation signal (that is, WAKE_UP is a low level) is also stopped from being output to the battery management system 500.

[0094] In this embodiment, through the different working states of the switch tube Q6, the switch tube Q3 and the switch tube Q2, combined with the filtering and delay circuit composed of resistors and capacitors, an effective activation signal path will be formed when the system detects suitable voltage conditions, thereby avoiding false activation caused by voltage fluctuations and enhancing the stability and reliability of the system.

[0095] In a specific embodiment, in order to describe the solution of the present application in more detail, the following is combined with Figure 8 The detailed circuit structure diagram is as follows: Figure 8 As shown, I will not go into details here. The implementation principle is as follows:

[0096] When the output voltage PV_IN of the photovoltaic power supply 300 is greater than the target voltage threshold (i.e., the reverse breakdown voltage of the Zener diode ZD1), the Zener diode ZD1 is broken down, and the PV_IN voltage is charged to the capacitor C1 through the Zener diode ZD1, the base of the PNP transistor Q1, and the resistor R2. By setting the charging time constant of the resistor R2 and the capacitor C1, the conduction time of the PNP transistor Q1 is set. When the PNP transistor Q1 is turned on, the PV_IN voltage is charged to the capacitor C2 through the Zener diode ZD1, the emitter and the collector of the PNP transistor Q1, and the voltage value across the capacitor C2 is equal to the PV_IN voltage value minus the reverse breakdown voltage value of the Zener diode ZD1. When the energy storage capacitor C2 is energized and the voltage reaches the set value, the current flows through the resistor R4 and the base of the NPN transistor Q2, and the NPN transistor Q2 is turned on. After the output voltage PV_IN of the photovoltaic power supply 300 breaks down the voltage-stabilizing diode ZD1, the current also flows through the resistor R7 and the base of the NPN transistor Q5, and the NPN transistor Q5 is turned on; the NPN transistor Q5 and the PNP transistor Q4 are thyristor structures, and then the PNP transistor Q4 is turned on, and under the action of the PV_IN0 voltage of the capacitor C2, the base voltage of the NPN transistor Q5 is increased to ensure that the NPN transistor Q5 is reliably turned on, that is, a valid WAKE_UP0 signal is output (that is, the WAKE_UP0 signal is at a low level).

[0097] After the signal output module 4 receives the valid WAKE_UP0 signal, the PNP transistor Q6 is turned on, and the current provided by the power supply voltage BAT of the power supply 700 flows to the ground through the current limiting resistor R10, the emitter and collector of the PNP transistor Q6, the emitter and base of the PNP transistor Q3, the resistor R5, and the collector and emitter of the NPN transistor Q2, thereby outputting a valid activation signal WAKE_UP (that is, the WAKE_UP signal is at a high level).

[0098] When the input PV_IN voltage is stable (capacitor C1 is fully charged), or when the PV_IN voltage drops, the PNP transistor Q1 is turned off, and the resistor R3 starts to discharge the charge on the capacitor C2. The voltage of the capacitor C2 is discharged below the minimum conduction voltage of the NPN transistor Q2, and the NPN transistor Q2 is turned off. The current provided by the power supply voltage BAT of the power supply 700 charges the capacitor C4 through the current limiting resistor R10, the emitter and collector of the PNP transistor Q6, the emitter and base of the PNP transistor Q3, and the resistor R5. After the capacitor C4 is fully charged, the PNP transistor Q3 is turned off, and the signal output module 4 outputs the invalid activation signal WAKE_UP (that is, the WAKE_UP signal is low).

[0099] When the output voltage PV_IN of the photovoltaic power source 300 is less than the target voltage threshold, the WAKE_UP0 signal is a high-level signal, that is, an invalid WAKE_UP0 signal. At this time, the base voltage of the PNP transistor Q6 is pulled up to the power supply voltage BAT of the power supply 700 by the resistor R9, and the PNP transistor Q6 is turned off. At the same time, the PNP transistor Q3 is turned off, and the signal output module 4 outputs an invalid activation signal WAKE_UP (that is, the WAKE_UP signal is low).

[0100] Among them, the diode D1 and the resistor R1 form a follower discharge circuit, the purpose of which is that when the PV_IN voltage drops, the voltage of the capacitor C1 is discharged through the diode D1 and the resistor R1, so that when the PV_IN voltage drops, the voltage of the capacitor C1 is always close to the PV_IN voltage value minus the reverse breakdown voltage value of the voltage-stabilizing diode ZD1, so that when the PV_IN voltage rises next time, the PV_IN voltage passes through the voltage-stabilizing diode ZD1, the emitter and base of the PNP transistor Q1, and the resistor R2 to charge the capacitor C1 (at this time, the PV_IN voltage value minus the reverse breakdown voltage value of the voltage-stabilizing diode ZD1 is greater than the voltage value of the capacitor C1), the PNP transistor Q1 is turned on, and the PV_IN voltage passes through the voltage-stabilizing diode ZD1 and the PNP transistor Q1 to charge the capacitor C2. That is, through the follower discharge circuit, it is realized that every time the PV_IN voltage shows an upward trend, the capacitor C2 is energized, thereby turning on the NPN transistor Q2.

[0101] In this embodiment, the hardware circuit cleverly and accurately determines when the input PV_IN voltage rises, and reliably outputs an effective activation pulse signal to activate the battery management system, thereby avoiding frequent output of activation signals when the PV_IN voltage fluctuates. After the input PV_IN voltage stabilizes, the activation signal disappears, allowing the battery management system to shut down normally.

[0102] In an exemplary embodiment, the present application also provides a photovoltaic charging system, which includes a photovoltaic power supply, a battery management system, and a photovoltaic charging activation circuit as in the above embodiment, wherein the photovoltaic charging activation circuit is respectively connected to the photovoltaic power supply and the battery management system.

[0103] In this embodiment, an integrated photovoltaic charging system is provided. By introducing the above-mentioned photovoltaic charging activation circuit, it is ensured that the battery management system can only be activated when the photovoltaic power source meets specific voltage conditions, thereby effectively avoiding erroneous operations caused by voltage instability and improving the reliability and energy efficiency of the system.

[0104] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", 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 description of the above terms does not necessarily refer to the same embodiment or example.

[0105] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A photovoltaic charging activation circuit, characterized in that: include: Activate control module and signal output module; The activation control module and the signal output module are connected in series between the photovoltaic power source and the battery management system, and the signal output module is also connected to the power supply; The activation control module is used to output a driving signal to the signal output module when the output voltage of the photovoltaic power source at the current moment is greater than the target voltage threshold and greater than the output voltage at the previous moment, so that the signal output module outputs an activation signal to the battery management system based on the power supply voltage of the power supply; Wherein, the target voltage threshold is used to represent the minimum voltage for activating the battery management system; Wherein, the driving signal includes a first sub-driving signal and a second sub-driving signal, and the activation control module includes: a voltage detection unit and a step detection unit; The first input end of the voltage detection unit is used to connect to the photovoltaic power source, and the first output end of the voltage detection unit is connected to the first input end of the signal output module; The step detection unit is connected in series between the second output terminal of the voltage detection unit and the second input terminal of the signal output module; The voltage detection unit is used to output an intermediate voltage signal to the step detection unit and output the first sub-driving signal to the signal output module when the output voltage of the photovoltaic power source at the current moment is greater than the target voltage threshold; the intermediate voltage signal is positively correlated with the output voltage; The step detection unit is used to output the second sub-driving signal to the signal output module when the intermediate voltage signal at the current moment is greater than the intermediate voltage signal at the previous moment, so that the signal output module outputs the activation signal when receiving the first sub-driving signal and the second sub-driving signal; The step detection unit includes: a switch circuit, a first charge and discharge circuit, and a second charge and discharge circuit; The input end of the switch circuit is connected to the second output end of the voltage detection unit, the first output end of the switch circuit is connected to the input end of the first charge and discharge circuit, the second output end of the switch circuit is connected to the input end of the second charge and discharge circuit, and the discharge controlled end of the first charge and discharge circuit is connected to the second output end of the voltage detection unit; the output end of the second charge and discharge circuit is connected to the second input end of the signal output module, or the output end of the second charge and discharge circuit is connected to the second input end of the signal output module and the second input end of the voltage detection unit respectively; The switch circuit is turned on when the voltage difference between the input terminal and the first output terminal of the switch circuit meets the conduction condition, and charges the first charge-discharge circuit and the second charge-discharge circuit, so that the second charge-discharge circuit outputs the second sub-driving signal; The switch circuit is turned off when the voltage difference does not satisfy the conduction condition, so that the first charge and discharge circuit and the second charge and discharge circuit are discharged.

2. The photovoltaic charging activation circuit according to claim 1, characterized in that: The activation control module is further configured to stop outputting the drive signal when the output voltage at the current moment is less than the target voltage threshold and / or is less than or equal to the output voltage at the previous moment.

3. The photovoltaic charging activation circuit according to claim 1, characterized in that: The voltage detection unit is further configured to stop outputting the intermediate voltage signal and the first sub-driving signal when the output voltage at the current moment is less than the target voltage threshold; and / or, The step detection unit is further configured to stop outputting the second sub-driving signal when the intermediate voltage signal at the current moment is less than or equal to the intermediate voltage signal at the previous moment.

4. The photovoltaic charging activation circuit according to claim 1, characterized in that: The output end of the step detection unit is also connected to the second input end of the voltage detection unit; The voltage detection unit is further configured to continuously output the first sub-driving signal when receiving the second sub-driving signal.

5. The photovoltaic charging activation circuit according to claim 1, characterized in that: The switch circuit includes: a switch tube Q1; the emitter of the switch tube Q1 is connected to the second output end of the voltage detection unit, the collector of the switch tube is connected to the second input end of the signal output module, and the base of the switch tube Q1 is connected to the input end of the first charge and discharge circuit; and / or, The first charge and discharge circuit comprises: a resistor R2, a capacitor C1, a diode D1 and a resistor R1; the resistor R2, the anode of the diode D1, the cathode of the diode D1 and the resistor R1 are sequentially connected in series between the first output terminal of the switch circuit and the ground terminal, and the capacitor C1 is connected in parallel with the resistor R1; and / or, The second charge-discharge circuit includes: a capacitor C2 and a resistor R3; the capacitor C2 and the resistor R3 are connected in parallel between the second output terminal of the switch circuit and the ground terminal.

6. The photovoltaic charging activation circuit according to claim 1, characterized in that: The voltage detection unit includes: a voltage stabilizing diode ZD1, a switch tube Q4 and a switch tube Q5; The cathode of the voltage-stabilizing diode ZD1 is used to connect to the photovoltaic power source, the anode of the voltage-stabilizing diode ZD1 is respectively connected to the collector of the switching tube Q4 and the base of the switching tube Q5, the emitter of the switching tube Q4 is connected to the output end of the step detection unit, the base of the switching tube Q4 is connected to the collector of the switching tube Q5, and the emitter of the switching tube Q5 is grounded.

7. The photovoltaic charging activation circuit according to claim 1, characterized in that: The signal output module includes: a switch tube Q6, a resistor R9, a switch tube Q3, a resistor R5, a capacitor C4, a switch tube Q2, a resistor R4 and a capacitor C3; The emitter of the switch tube Q6 is used to connect to the power supply, the base of the switch tube Q6 is connected to the first output end of the voltage detection unit, and the collector of the switch tube Q6 is connected to the emitter of the switch tube Q3; The resistor R9 is connected between the emitter and the base of the switch tube Q6; The collector of the switch tube Q3 is used to connect to the battery management system, and the resistor R5 and the capacitor C4 are connected in series to the base of the switch tube Q3 and the ground terminal in sequence; The resistor R4 and the capacitor C3 are connected in series between the output terminal and the ground terminal of the step detection unit; The collector of the switch tube Q2 is connected between the resistor R5 and the capacitor C4, the emitter of the switch tube Q2 is grounded, and the base of the switch tube Q2 is connected between the resistor R4 and the capacitor C3.

8. A photovoltaic charging system, characterized in that: The photovoltaic charging system comprises: Photovoltaic power source; Battery management system; And the photovoltaic charging activation circuit according to any one of claims 1 to 7, wherein the photovoltaic charging activation circuit is connected to the photovoltaic power source and the battery management system respectively.

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