Photovoltaic weak current consumption control circuit and energy storage system

Abstract

The utility model relates to the technical field of energy storage power supplies, and mainly provides a photovoltaic weak current consumption control circuit and an energy storage system, which comprise a consumption trigger module, a consumption module and a control module, the consumption module is respectively connected with the consumption trigger module and the control module, the consumption module and the consumption trigger module are also connected with the photovoltaic input source, and the control module is connected with the photovoltaic charging circuit; the consumption trigger module is used for outputting a first control signal to the consumption module when the output voltage of the photovoltaic input source is larger than a first preset value, so that the consumption module consumes the output voltage, and the situation that the electric quantity of a battery of the photovoltaic charging circuit is consumed is avoided. The control module is used for receiving a second control signal and controlling the consumption module to stop working when the output voltage of the loaded photovoltaic input source is greater than a second preset value, so as to control the photovoltaic input source to charge the battery of the photovoltaic charging circuit when the output voltage is sufficient to charge the battery of the photovoltaic charging circuit; therefore, the utilization rate of the photovoltaic input source is improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of energy storage power supplies, and in particular to a photovoltaic weak current consumption control circuit and an energy storage system. [Background technology]

[0002] As the global energy crisis becomes more and more prominent, clean energy has gradually become one of the important energy sources for mankind, especially solar energy. Solar energy converts solar radiation energy into electrical energy through the photoelectric effect of solar panels. Currently, new energy products that use solar energy are also developing rapidly, such as energy storage power supplies.

[0003] During the operation of solar panels, if there is a shade or dark clouds blocking the sunlight or working at night, the solar panels will output a weak voltage, which can activate the energy storage power supply, but the actual output power is not enough to start charging the energy storage power supply. At this time, the energy storage power supply will not only fail to charge after activation, but also consume the power of the internal battery, resulting in a phenomenon that the more the solar energy is activated, the less the charging capacity will be.

[0004] Or when the solar panels output weak voltage and the weather changes frequently, the output voltage of the solar panels is not stable, which will cause the energy storage power supply to be continuously in an activated startup and power-off shutdown state, resulting in unstable system operation and greatly reducing the service life of the energy storage power supply. [Contents of the utility model]

[0005] The embodiment of the utility model provides a photovoltaic weak current consumption control circuit and energy storage system, aiming to solve the technical problems in the prior art that the weak voltage output by the solar panel causes the energy storage power supply to be less and less, the operation is unstable and the life is greatly lost.

[0006] In order to solve the above technical problems, a technical solution adopted by the embodiment of the utility model is: to provide a photovoltaic weak current consumption control circuit, which is applied to an energy storage system, wherein the energy storage system includes a photovoltaic input source and a photovoltaic charging circuit, and the photovoltaic weak current consumption control circuit includes a consumption trigger module, a consumption module and a control module;

[0007] The consumption module is connected to the consumption trigger module and the control module respectively, the consumption module and the consumption trigger module are also used to connect to the photovoltaic input source, and the control module is used to connect to the photovoltaic charging circuit;

[0008] The consumption trigger module is used to output a first control signal to the consumption module when the output voltage of the photovoltaic input source is greater than a first preset value, so as to control the consumption module to work and consume the output voltage of the photovoltaic input source;

[0009] The control module is used to receive a second control signal output by the photovoltaic charging circuit when the output voltage of the photovoltaic input source after load consumption is greater than a second preset value, and control the consumption module to stop working based on the second control signal, wherein the first preset value is less than the second preset value.

[0010] Optionally, the consumption trigger module includes a voltage division control unit and a locking unit;

[0011] The voltage division control unit is connected to the locking unit and the consumption module respectively, the locking unit is also connected to the consumption module, and the voltage division control unit is also used to connect to the photovoltaic input source;

[0012] The voltage division control unit is used to divide the output voltage of the photovoltaic input source, and determine whether the output voltage after voltage division reaches a trigger threshold, so as to determine whether the output voltage is greater than the first preset value, and when the output voltage after voltage division reaches the trigger threshold, control the consumption module to start working;

[0013] The locking unit is used to adjust the proportion of the divided output voltage after the consumption module starts working, so as to maintain the operation of the consumption module.

[0014] Optionally, the voltage division control unit includes a resistor R2, a resistor R5 and a resistor R10;

[0015] The first end of the resistor R2 is connected to the photovoltaic input source, the resistor R2 is connected in series with the resistor R5, the second end of the resistor R2 is also connected to the consumption module, the resistor R5 is also connected in series with the resistor R10, the resistor R10 is also used for grounding, and the second end of the resistor R5 is also connected to the locking unit.

[0016] Optionally, the locking unit includes a resistor R9, a voltage regulator tube ZD3 and a switch tube Q9;

[0017] The first end of the resistor R9 is connected to the consumption module, the second end of the resistor R9 is connected to the cathode of the voltage regulator tube ZD3, the anode of the voltage regulator tube ZD3 is connected to the control end of the switch tube Q9, the first end of the switch tube Q9 is connected to the first end of the resistor R10, and the second end of the switch tube Q9 is used for grounding.

[0018] Optionally, the consumption module includes a resistor RT1 and a switch tube Q3;

[0019] The control end of the switch tube Q3 is connected to the voltage division control unit, the first end of the switch tube Q3 is connected to the photovoltaic input source through the resistor RT1, the first end of the switch tube Q3 is also connected to the locking unit, and the second end of the switch tube Q3 is used for grounding.

[0020] Optionally, the consumption module further includes a clamping diode ZD2;

[0021] The cathode of the clamping diode ZD2 is connected to the control end of the switch tube Q3, and the anode of the clamping diode ZD3 is grounded.

[0022] Optionally, the control module includes a control unit and a delay unit;

[0023] The control unit is connected to the photovoltaic charging circuit, the control unit is also connected to the delay unit, and the delay unit is connected to the consumption module;

[0024] The control unit is used to receive the second control signal and output a driving signal to the delay unit based on the second control signal;

[0025] The delay unit is used to output a shutdown signal to the consumption module after receiving the driving signal for a preset time, so that the consumption module stops consuming the output voltage according to the shutdown signal.

[0026] Optionally, the control unit includes a resistor R7 and a switch tube Q7;

[0027] The control end of the switch tube Q7 is connected to the photovoltaic charging circuit through the resistor R7, the first end of the switch tube Q7 is connected to the delay unit, and the second end of the switch tube Q7 is used for grounding.

[0028] Optionally, the delay unit includes a resistor R3, a resistor R4, a capacitor C3, a voltage regulator tube ZD1 and a switch tube Q4;

[0029] The first end of the resistor R3 is connected to the first voltage, the second end of the resistor R3 is respectively connected to the first end of the capacitor C3 and the first end of the switch tube Q7, the second end of the capacitor C3 is used for grounding, the resistor R3 is also connected to the cathode of the voltage regulator tube ZD1 through the resistor R4, the anode of the voltage regulator tube ZD1 is connected to the control end of the switch tube Q4, the first end of the switch tube Q4 is connected to the consumption module, and the second end of the switch tube Q4 is used for grounding.

[0030] In order to solve the above technical problems, another technical solution adopted by the embodiment of the utility model is: to provide an energy storage system, the energy storage system comprising:

[0031] Photovoltaic input source;

[0032] Photovoltaic charging circuit; and

[0033] The photovoltaic weak current consumption control circuit as described above.

[0034] Different from the related art, the utility model provides a photovoltaic weak-current consumption control circuit and an energy storage system, which are applied to an energy storage system, wherein the energy storage system includes a photovoltaic input source and a photovoltaic charging circuit, and the photovoltaic weak-current consumption control circuit includes a consumption trigger module, a consumption module and a control module; the consumption module is connected to the consumption trigger module and the control module respectively, and the consumption module and the consumption trigger module are also used to connect to the photovoltaic input source, and the control module is used to connect to the photovoltaic charging circuit; the consumption trigger module is used to output a first control signal to the consumption module when the output voltage of the photovoltaic input source is greater than a first preset value, so as to control the consumption module to work and consume the output voltage of the photovoltaic input source, thereby avoiding activating the photovoltaic charging circuit when the output voltage of the photovoltaic input source is insufficient to charge the battery of the photovoltaic charging circuit, thereby consuming the battery power of the photovoltaic charging circuit itself. The control module is used to receive a second control signal output by the photovoltaic charging circuit when the output voltage of the photovoltaic input source after load consumption is greater than a second preset value, and control the consumption module to stop working based on the second control signal, so as to control the consumption module to stop consuming the output voltage when the output voltage of the photovoltaic output source is sufficient to charge the battery of the photovoltaic charging circuit, so that the photovoltaic input source charges the battery of the photovoltaic charging circuit, thereby improving the utilization rate of the photovoltaic input source. Wherein, the first preset value is less than the second preset value.

Brief Description of the Drawings

[0035] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0036] Figure 1 It is a structural block diagram of an energy storage system provided by an embodiment of the utility model;

[0037] Figure 2 This is a structural block diagram of a photovoltaic weak current consumption control circuit provided by an embodiment of the utility model;

[0038] Figure 3 A circuit diagram of a photovoltaic weak current consumption control circuit provided by the embodiment of the utility model

[0039] Figure 4 It is a circuit diagram of an energy storage system provided by an embodiment of the utility model. [Specific implementation method]

[0040] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0041] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0042] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0043] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more.

[0044] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0045] See also Figure 1 , Figure 1 is a structural block diagram of an energy storage system provided by an embodiment of the utility model, such as Figure 1As shown, the energy storage system 1 includes a photovoltaic input source 10, a photovoltaic charging circuit 20 and a photovoltaic weak current consumption control circuit 30; the photovoltaic weak current consumption control circuit 30 is connected to the photovoltaic input source 10 and the photovoltaic charging circuit 20 respectively. Specifically, the photovoltaic input source 10 is used to receive sunlight and convert the sunlight into an output voltage and input it into the photovoltaic charging circuit 20, so that the photovoltaic charging circuit 20 charges its own battery based on the output voltage. Wherein, before the output voltage of the photovoltaic input source 10 is input to the photovoltaic charging circuit 20, the photovoltaic weak current consumption control circuit 30 receives the output voltage of the photovoltaic input source 10, and when the output voltage is greater than a first preset value and less than a second preset value, consumes the output voltage to avoid the output voltage activating the photovoltaic charging circuit 20; if the output voltage is greater than the second preset value, the output voltage is output to the photovoltaic charging circuit 20, so that the photovoltaic charging circuit 20 charges its own battery based on the output voltage. It should be noted that the first preset value is the activation voltage of the photovoltaic charging circuit 20. When the output voltage of the photovoltaic input source 10 is greater than the first preset value, the photovoltaic charging circuit 20 will be activated by the output voltage and start working. However, since the output voltage of the photovoltaic input source 100 is less than the second preset value (the charging voltage of the photovoltaic charging circuit 20), when the photovoltaic charging circuit 20 is activated, it will consume the power stored in its own battery, resulting in a phenomenon that the battery power is charged less and less. Based on this, by setting the photovoltaic weak current consumption control circuit 30, when the output voltage of the photovoltaic input source 10 is less than the second preset value, the output voltage is consumed, thereby preventing the output voltage from activating the photovoltaic charging circuit 20.

[0046] For details, please refer to Figure 2 , Figure 2 This is a structural block diagram of a photovoltaic weak current consumption control circuit provided by an embodiment of the utility model. Figure 2 As shown, the photovoltaic weak current consumption control circuit 30 includes a consumption trigger module 31, a consumption module 32 and a control module 33;

[0047] The consumption module 32 is connected to the consumption trigger module 31 and the control module 33 respectively. The consumption module 32 and the consumption trigger module 31 are also used to connect to the photovoltaic input source 10, and the control module 33 is used to connect to the photovoltaic charging circuit 20;

[0048] The consumption trigger module 31 is used to output a first control signal to the consumption module 32 when the output voltage of the photovoltaic input source 10 is greater than a first preset value, so as to control the consumption module 32 to work and consume the output voltage of the photovoltaic input source 10;

[0049] The control module 33 is used to receive a second control signal output by the photovoltaic charging circuit 20 when the output voltage of the photovoltaic input source 10 after load consumption is greater than a second preset value, and control the consumption module 32 to stop working based on the second control signal, wherein the first preset value is less than the second preset value.

[0050] Specifically, when the output voltage of the photovoltaic input source 10 is greater than a first preset value, the consumption module 32 consumes the output voltage. At this time, the photovoltaic input source 10 is in a loaded state, and the output voltage of the photovoltaic input source 10 will be pulled down by the consumption module 32 .

[0051] When the photovoltaic input source 10 is in a loaded state, the consumption trigger module 31 will determine whether the output voltage is greater than a second preset value. If the output voltage is greater than the second preset value, the second control signal output by the photovoltaic charging circuit 20 is received to control the consumption module 32 to stop consuming the output voltage, so that the output voltage is directly input to the photovoltaic charging circuit 20 to start charging. Among them, the second preset value is the charging voltage of the photovoltaic charging circuit 20. Only when the output voltage is greater than the charging voltage of the photovoltaic charging circuit 20 can the photovoltaic charging circuit 20 itself be charged while activating the photovoltaic charging circuit 20.

[0052] Among them, Figure 2 As shown, the consumption trigger module 31 includes a voltage division control unit 311 and a locking unit 312; the voltage division control unit 311 is connected to the locking unit 312 and the consumption module 32 respectively, the locking unit 312 is also connected to the consumption module 32, and the voltage division control unit 311 is also used to connect to the photovoltaic input source 10;

[0053] The voltage division control unit 311 is used to divide the output voltage of the photovoltaic input source 10, and determine whether the output voltage after voltage division reaches a trigger threshold, so as to determine whether the output voltage is greater than the first preset value. When the output voltage after voltage division reaches the trigger threshold, the consumption module 32 is controlled to start working;

[0054] The locking unit 312 is used to adjust the proportion of the divided output voltage after the consumption module 32 starts working, so as to keep the consumption module 32 working.

[0055] Specifically, when the consumption module 32 works based on the voltage division control unit 311, the output voltage of the photovoltaic input source 10 will be consumed by the consumption module 32. At this time, the photovoltaic input source 10 is in a loaded state, and when the photovoltaic input source 10 is in a loaded state, the output voltage of the photovoltaic input source 10 will be pulled down. When the output voltage of the photovoltaic input source 10 is pulled down, the divided output voltage output by the voltage division control unit 311 will be lower than the trigger threshold. Among them, when the divided output voltage is lower than the trigger threshold, the consumption module 32 will stop working, and the photovoltaic input source 10 will cause the output voltage to rebound due to being in a no-load state, so that the output voltage will be output to the photovoltaic charging circuit 20, activating the photovoltaic charging circuit 20. Therefore, in order to prevent the output voltage of the photovoltaic input source 10 from activating the photovoltaic charging circuit 20, the locking unit 312 will adjust the proportion of the divided output voltage so that the divided output voltage can still reach the trigger threshold, thereby maintaining the consumption module 32 to continuously consume the output voltage of the photovoltaic input source 10.

[0056] In some embodiments, see Figure 3 , Figure 3 A circuit diagram of a photovoltaic weak current consumption control circuit provided by an embodiment of the utility model, such as Figure 3 As shown, the voltage division control unit 311 includes a resistor R2, a resistor R5 and a resistor R10; the locking unit 312 includes a resistor R9, a voltage regulator tube ZD3 and a switch tube Q9.

[0057] The first end of the resistor R2 is connected to the photovoltaic input source 10, the resistor R2 is connected in series with the resistor R5, the second end of the resistor R2 is also connected to the consumption module 32, the resistor R5 is also connected in series with the resistor R10, the resistor R10 is also used for grounding, and the second end of the resistor R5 is also connected to the locking unit 312.

[0058] The first end of the resistor R9 is connected to the consumption module 32, the second end of the resistor R9 is connected to the cathode of the voltage regulator tube ZD3, the anode of the voltage regulator tube ZD3 is connected to the control end of the switch tube Q9, the first end of the switch tube Q9 is connected to the first end of the resistor R10, and the second end of the switch tube Q9 is used for grounding.

[0059] Specifically, when the photovoltaic input source 10 outputs the output voltage corresponding to the sunlight output, on the one hand, the output voltage will be applied to the voltage regulator ZD3 through the consumption module 32, so that the voltage regulator ZD3 is broken down. When the voltage regulator ZD3 is broken down, the switch tube Q9 is turned on. At this time, since the switch tube Q9 is connected in parallel with the resistor R10, the resistor R10 is short-circuited by the switch tube Q9. On the other hand, when the resistor R10 is short-circuited, the output voltage will be applied to both ends of the resistor R2 and the resistor R5, so that the resistor R2 and the resistor R5 divide the output voltage. When the output voltage after the voltage division of the resistor R2 and the resistor R5 reaches the trigger threshold, it is considered that the output voltage is greater than the first preset value, and the first control signal is output to the consumption module 32, so that the consumption module 32 starts to consume the output voltage.

[0060] Among them, Figure 3 As shown, the consumption module 32 includes a resistor RT1 and a switch tube Q3; the control end of the switch tube Q3 is connected to the voltage division control unit 311, the first end of the switch tube Q3 is connected to the photovoltaic input source 10 through the resistor RT1, the first end of the switch tube Q3 is also connected to the locking unit 312, and the second end of the switch tube Q3 is used for grounding.

[0061] Specifically, when the divided output voltage output by the voltage division control unit 311 reaches the trigger threshold, the switch tube Q3 will be turned on according to the first control signal. At this time, the output voltage of the photovoltaic input source 10 will flow into the ground terminal through the resistor RT1 and the switch tube Q3, thereby consuming the output voltage. Among them, the trigger threshold is the threshold voltage of the switch tube Q3. It should be noted that when the consumption module 32 starts to consume the output voltage, the output voltage of the photovoltaic input source 10 will be pulled down by the consumption module 32, so that the divided output voltage output by the voltage division control unit 311 cannot reach the trigger threshold, so that the switch tube Q3 is turned off. However, when the consumption module 32 starts to work, the output voltage flows into the ground terminal through the switch tube Q3, causing the voltage regulator tube ZD3 to be turned off due to no current passing through, and the switch tube Q9 is also turned off, so that the resistor R10 and the resistor R5 and the resistor R2 simultaneously divide the output voltage. At this time, the divided output voltage output by the voltage division control unit 311 will reach the trigger threshold again, so that the voltage division control unit 311 continues to output the first control signal, thereby making the consumption module 32 continue to work.

[0062] In some embodiments, Figure 3As shown, the consumption module 32 further includes a clamping diode ZD2; the cathode of the clamping diode ZD2 is connected to the control terminal of the switch tube Q3, and the anode of the clamping diode ZD2 is used for grounding. The clamping diode ZD2 is used to ensure that the control terminal voltage of the switch tube Q3 is within the rated range, thereby avoiding damage to the switch tube Q3 due to the output voltage of the photovoltaic input source 10 being too large.

[0063] In yet another embodiment, Figure 2 As shown, the control module 33 includes a control unit 331 and a delay unit 332; the control unit 331 is connected to the photovoltaic charging circuit 20, the control unit 331 is also connected to the delay unit 332, and the delay unit 332 is connected to the consumption module 32;

[0064] The control unit 331 is used for receiving the second control signal, and outputting a driving signal to the delay unit 332 based on the second control signal;

[0065] The delay unit 332 is used to output a shutdown signal to the consumption module 32 after receiving the driving signal for a preset time, so that the consumption module 32 stops consuming the output voltage according to the shutdown signal.

[0066] Among them, Figure 3 As shown, the control unit 331 includes a resistor R7 and a switch tube Q7; the delay unit 332 includes a resistor R3, a resistor R4, a capacitor C3, a voltage regulator tube ZD1 and a switch tube Q4;

[0067] The control end of the switch tube Q7 is connected to the photovoltaic charging circuit 20 through the resistor R7, the first end of the switch tube Q7 is connected to the delay unit 332, and the second end of the switch tube Q7 is grounded.

[0068] The first end of the resistor R3 is connected to the first voltage (VCC), the second end of the resistor R3 is respectively connected to the first end of the capacitor C3 and the first end of the switch tube Q7, the second end of the capacitor C3 is used for grounding, the resistor R3 is also connected to the cathode of the voltage regulator tube ZD1 through the resistor R4, the anode of the voltage regulator tube ZD1 is connected to the control end of the switch tube Q4, the first end of the switch tube Q4 is connected to the consumption module 32, and the second end of the switch tube Q4 is used for grounding.

[0069] Specifically, when the output voltage of the photovoltaic input source 10 is greater than the second preset threshold, the photovoltaic charging circuit 20 will output a second control signal, and at this time, the switch tube Q7 will be cut off based on the second control signal. When the switch tube Q7 is cut off, the first voltage will charge the capacitor C3 through the resistor R3. When the voltage of the capacitor C3 reaches the preset value, the voltage regulator tube ZD1 is broken down, so that the switch tube Q4 is turned on, and then the switch tube Q3 is controlled to be cut off, the consumption module 32 stops working, and the photovoltaic charging circuit 20 starts to charge its own battery. It should be noted that at the moment when the consumption module 32 stops working, the output voltage of the photovoltaic input source 10 will suddenly rise due to no load. At this time, if the output voltage of the photovoltaic input source 10 is large enough, there will be a risk of damaging the components in the photovoltaic charging circuit 20. Therefore, after the delay unit 331 enters the working state, the photovoltaic charging circuit 20 is controlled to start working. At this time, due to the effect of the delay unit 331, the time when the consumption module 32 stops working lags behind the working time of the photovoltaic charging circuit 20. The consumption module 32 and the photovoltaic charging circuit 20 will work simultaneously for a period of time. Since the power required by the photovoltaic charging circuit 20 is much greater than the power consumed by the consumption module 32, at the moment when the consumption module 32 is disconnected, the output voltage of the photovoltaic input source 10 will still be pulled down by the photovoltaic charging circuit 20, thereby avoiding the output voltage of the photovoltaic input source 10 from rebounding, thereby protecting the devices in the photovoltaic charging circuit 20.

[0070] In some embodiments, see Figure 4 , Figure 4 is a circuit diagram of an energy storage system provided by an embodiment of the utility model, such as Figure 4As shown, the relay RLY1, the diode D1, the resistor R1, the switch tube Q6, the pre-charge capacitor C1, the buck-boost module (the switch tube Q1, the switch tube Q2, the switch tube Q8, the switch tube Q5 and the inductor L1) and the battery (BAT+) constitute the photovoltaic charging circuit 20. When the output voltage of the photovoltaic input source 10 is less than the first preset value, the output voltage will pass through the resistor RT1 and the resistor R9 to break down the voltage regulator tube ZD3, thereby turning on the switch tube Q9 and short-circuiting the resistor R10; at this time, if the output voltage rises to be greater than the first preset value and less than the second preset value, the resistor R2 and the resistor R5 will divide the output voltage to turn on the switch tube Q3. When the switch tube Q3 is turned on, the output voltage of the photovoltaic input source 10 will be consumed by the resistor RT1 and the switch tube Q3, thereby turning off the switch tube Q9, and the resistor R10 participates in the voltage division of the resistor R2 and the resistor R5, so that the output voltage after voltage division still meets the conduction voltage drop of the switch tube Q3, and controls the switch tube Q3 to continuously consume the output voltage. It should be noted that, at the moment when the output voltage of the photovoltaic input source 10 is greater than the first preset value, the output voltage of the photovoltaic input source 10 will pre-charge the pre-charge capacitor C1 through the diode D1 and the resistor R1, so that the auxiliary power supply (+12V) starts to work, that is, the potential at point A in the circuit is high, so that the switch tube Q7 is turned on. When the switch tube Q7 is turned on, the first voltage and the switch tube Q7 form a loop, so that the switch tube Q4 is turned off, and the switch tube Q3 still consumes the output voltage.

[0071] When the output voltage is greater than the second preset value, the resistor R6 receives an enable signal and controls the switch tube Q6 to turn on according to the enable signal. When the switch tube Q6 is turned on, on the one hand, the control end of the switch tube Q7 is cut off due to receiving a low level. When the switch tube Q7 is cut off, the first voltage will charge the capacitor C3 through the resistor R3. When the voltage of the capacitor C3 rises to a certain value, the voltage regulator ZD1 is broken down, so that the switch tube Q4 is turned on. When the switch tube Q4 is turned on, the control end voltage of the switch tube Q3 will be pulled down, so that it is in a cut-off state. Based on this, the consumption module 32 can be controlled to stop working. On the other hand, the coil end of the relay RLY1 and the switch tube Q6 will form a loop, so that the connection end of the relay RLY1 is attracted. When the relay RLY1 is in the attracted state, the output voltage will be output to the buck-boost circuit through the relay RLY1, so that the battery is charged by the buck-boost circuit. It should be noted that, when the switch tube Q6 outputs the first control signal to the control end of the switch tube Q7 based on the enable signal, the buck-boost circuit will also receive the working signal and start working. When the buck-boost circuit starts working, the first voltage is also charging the capacitor C3. At this time, the buck-boost circuit and the consumption module 32 will consume the output voltage at the same time. When the amount of electricity stored in the capacitor C3 exceeds a certain threshold, the consumption module 32 will stop working, but the buck-boost circuit is still consuming the output voltage, thereby avoiding the situation where the voltage of the photovoltaic input source 10 rebounds due to no load.

[0072] An embodiment of the utility model provides a photovoltaic weak-current consumption control circuit, which is applied to an energy storage system, wherein the energy storage system includes a photovoltaic input source and a photovoltaic charging circuit, and the photovoltaic weak-current consumption control circuit includes a consumption trigger module, a consumption module and a control module; the consumption module is connected to the consumption trigger module and the control module respectively, and the consumption module and the consumption trigger module are also used to connect to the photovoltaic input source, and the control module is used to connect to the photovoltaic charging circuit; the consumption trigger module is used to output a first control signal to the consumption module when the output voltage of the photovoltaic input source is greater than a first preset value, so that the consumption module consumes the output voltage, thereby avoiding activating the photovoltaic charging circuit when the output voltage of the photovoltaic input source is insufficient to charge the battery of the photovoltaic charging circuit, thereby consuming the battery power of the photovoltaic charging circuit itself. The control module is used to receive a second control signal output by the photovoltaic charging circuit when the output voltage of the photovoltaic input source after load consumption is greater than a second preset value, and control the consumption module to stop working based on the second control signal, so as to control the consumption module to stop consuming the output voltage when the output voltage of the photovoltaic output source is sufficient to charge the battery of the photovoltaic charging circuit, so that the photovoltaic input source charges the battery of the photovoltaic charging circuit, thereby improving the utilization rate of the photovoltaic input source. Wherein, the first preset value is less than the second preset value.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A photovoltaic weak current consumption control circuit, characterized in that: Applied to an energy storage system, wherein the energy storage system includes a photovoltaic input source and a photovoltaic charging circuit, and the photovoltaic weak current consumption control circuit includes a consumption trigger module, a consumption module and a control module; The consumption module is connected to the consumption trigger module and the control module respectively, the consumption module and the consumption trigger module are also used to connect to the photovoltaic input source, and the control module is used to connect to the photovoltaic charging circuit; The consumption trigger module is used to output a first control signal to the consumption module when the output voltage of the photovoltaic input source is greater than a first preset value, so as to control the consumption module to work and consume the output voltage of the photovoltaic input source; The control module is used to receive a second control signal output by the photovoltaic charging circuit when the output voltage of the photovoltaic input source after load consumption is greater than a second preset value, and control the consumption module to stop working based on the second control signal, wherein the first preset value is less than the second preset value.

2. The photovoltaic weak current consumption control circuit according to claim 1 is characterized in that: The consumption trigger module includes a voltage division control unit and a locking unit; The voltage division control unit is connected to the locking unit and the consumption module respectively, the locking unit is also connected to the consumption module, and the voltage division control unit is also used to connect to the photovoltaic input source; The voltage division control unit is used to divide the output voltage of the photovoltaic input source, and determine whether the output voltage after voltage division reaches a trigger threshold, so as to determine whether the output voltage is greater than the first preset value, and when the output voltage after voltage division reaches the trigger threshold, control the consumption module to start working; The locking unit is used to adjust the proportion of the divided output voltage after the consumption module starts working, so as to maintain the operation of the consumption module.

3. The photovoltaic weak current consumption control circuit according to claim 2 is characterized in that: The voltage division control unit includes a resistor R2, a resistor R5 and a resistor R10; The first end of the resistor R2 is connected to the photovoltaic input source, the resistor R2 is connected in series with the resistor R5, the second end of the resistor R2 is also connected to the consumption module, the resistor R5 is also connected in series with the resistor R10, the resistor R10 is also used for grounding, and the second end of the resistor R5 is also connected to the locking unit.

4. The photovoltaic weak current consumption control circuit according to claim 3 is characterized in that: The locking unit includes a resistor R9, a voltage regulator tube ZD3 and a switch tube Q9; The first end of the resistor R9 is connected to the consumption module, the second end of the resistor R9 is connected to the cathode of the voltage regulator tube ZD3, the anode of the voltage regulator tube ZD3 is connected to the control end of the switch tube Q9, the first end of the switch tube Q9 is connected to the first end of the resistor R10, and the second end of the switch tube Q9 is used for grounding.

5. The photovoltaic weak current consumption control circuit according to claim 2, characterized in that: The consumption module includes a resistor RT1 and a switch tube Q3; The control end of the switch tube Q3 is connected to the voltage division control unit, the first end of the switch tube Q3 is connected to the photovoltaic input source through the resistor RT1, the first end of the switch tube Q3 is also connected to the locking unit, and the second end of the switch tube Q3 is used for grounding.

6. The photovoltaic weak current consumption control circuit according to claim 5, characterized in that: The consumption module also includes a clamping diode ZD2; The cathode of the clamping diode ZD2 is connected to the control end of the switch tube Q3, and the anode of the clamping diode ZD3 is grounded.

7. The photovoltaic weak current consumption control circuit according to claim 1, characterized in that: The control module includes a control unit and a delay unit; The control unit is connected to the photovoltaic charging circuit, the control unit is also connected to the delay unit, and the delay unit is connected to the consumption module; The control unit is used to receive the second control signal and output a driving signal to the delay unit based on the second control signal; The delay unit is used to output a shutdown signal to the consumption module after receiving the driving signal for a preset time, so that the consumption module stops consuming the output voltage according to the shutdown signal.

8. The photovoltaic weak current consumption control circuit according to claim 7, characterized in that: The control unit includes a resistor R7 and a switch tube Q7; The control end of the switch tube Q7 is connected to the photovoltaic charging circuit through the resistor R7, the first end of the switch tube Q7 is connected to the delay unit, and the second end of the switch tube Q7 is used for grounding.

9. The photovoltaic weak current consumption control circuit according to claim 8, characterized in that: The delay unit includes a resistor R3, a resistor R4, a capacitor C3, a voltage regulator tube ZD1 and a switch tube Q4; The first end of the resistor R3 is connected to the first voltage, the second end of the resistor R3 is respectively connected to the first end of the capacitor C3 and the first end of the switch tube Q7, the second end of the capacitor C3 is used for grounding, the resistor R3 is also connected to the cathode of the voltage regulator tube ZD1 through the resistor R4, the anode of the voltage regulator tube ZD1 is connected to the control end of the switch tube Q4, the first end of the switch tube Q4 is connected to the consumption module, and the second end of the switch tube Q4 is used for grounding.

10. An energy storage system, characterized in that: The energy storage system comprises: Photovoltaic input source; Photovoltaic charging circuit; and A photovoltaic weak current consumption control circuit as described in any one of claims 1 to 9.

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