A power supply control circuit and an energy storage system

Abstract

The present application relates to the technical field of energy storage power supply, and mainly provides a power supply control circuit and an energy storage system, the circuit comprising an activation module, a detection control module and a first switch module connected with the activation module, a second switch module connected with the detection control module, the first switch module further connected with a photovoltaic input source, the detection control module and an auxiliary source, and the second switch module further connected with the auxiliary source and a battery. The activation module is used for outputting an activation signal when the input voltage of the photovoltaic input source is greater than a first preset value. The detection control module is used for controlling the second switch module to be turned on when the battery voltage is greater than a voltage threshold value and the activation signal is received, so as to supply power to the auxiliary source by the battery when the battery power is sufficient, thereby improving the stability of the energy storage system; and the first switch module is turned on based on the activation signal when the battery voltage is less than the voltage threshold value, so as to switch to supply power to the auxiliary source by the photovoltaic when the battery voltage is insufficient, realize seamless connection of auxiliary power supply, and thereby improve the reliability of the energy storage system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage power supply, and in particular to a power supply control circuit and an energy storage system. BACKGROUND

[0002] In a photovoltaic energy storage system, an auxiliary power supply (referred to as "auxiliary source") is a key to ensure the stable operation of core components such as battery management system (BMS), energy storage converter (PCS), and cooling system. The stability of its power supply is directly related to the safety and efficiency of the entire system.

[0003] At present, some photovoltaic energy storage systems attempt to use photovoltaic (PV) power generation to directly power the auxiliary power supply, in order to achieve efficient use of energy. However, photovoltaic input has significant limitations, and its input range is greatly affected by factors such as light intensity and weather changes, with a wide fluctuation range. If this sharply fluctuating power is directly connected to the auxiliary source loop, it will cause the auxiliary source power supply voltage to frequently exceed the device tolerance range, causing control module malfunctions, distorted monitoring data, and other problems, which seriously threaten the stable operation of the energy storage system.

[0004] To solve the problem of unstable photovoltaic output, a scheme of using a battery to power the auxiliary source is proposed. The battery, as a mature energy storage device, has its output voltage determined by the internal chemical system, and the output voltage remains stable regardless of changes in auxiliary source load. However, since the auxiliary source of the energy storage system needs to operate continuously for 24 hours, if it only relies on the battery for continuous power supply, the battery power will gradually be consumed. When the power drops below the minimum power threshold (i.e., an under-voltage occurs), if the battery power supply loop is not disconnected in time, the battery will enter an over-discharged state, which on the one hand will shorten the battery life and increase the operation and maintenance cost of the energy storage system; on the other hand, the output voltage of the over-discharged battery will drop sharply, which not only cannot meet the power supply demand of the auxiliary source, but also may trigger system protection due to the excessively low voltage, resulting in the overall shutdown of the energy storage system.

[0005] Therefore, in order to improve the stability and reliability of the energy storage system, it is necessary to provide a power supply control circuit. SUMMARY

[0006] The present application provides a power supply control circuit and an energy storage system, which aims to solve the technical problem of unstable auxiliary source power supply in the prior art, which leads to low stability of the energy storage system.

[0007] To solve the above technical problems, one technical solution adopted by the present application is to provide a power supply control circuit, which includes an activation module, a detection control module, a first switch module, and a second switch module.

[0008] The activation module is connected with the detection control module, the first switch module and the photovoltaic input source respectively, the first switch module is further connected with the detection control module and the auxiliary source respectively, and the second switch module is connected with the detection control module, the auxiliary source and the battery respectively.

[0009] The activation module is used for detecting an input voltage of the photovoltaic input source, and outputting an activation signal when the input voltage is greater than a first preset value.

[0010] The detection control module is used for detecting a battery voltage of the battery, and outputting a control signal to the second switch module to make the second switch module conductive when the activation signal is received and the battery voltage is greater than a voltage threshold, so that the battery supplies power to the auxiliary source.

[0011] The activation signal is transmitted to the first switch module to make the first switch module conductive when the activation signal is received and the battery voltage is less than the voltage threshold, so that the photovoltaic input source supplies power to the auxiliary source.

[0012] Optionally, the detection control module is further used for bypassing the activation signal transmitted to the first switch module to control the first switch module to be disconnected when the control signal is outputted.

[0013] Optionally, the detection control module is further used for delaying the transmission of the activation signal to the first switch module for a preset time when the activation signal is received and the battery voltage is less than the voltage threshold.

[0014] Optionally, the detection control module comprises a battery detection unit, a first control unit and a bypass unit.

[0015] The first control unit is connected with the activation module, the battery detection unit, the first switch module and the bypass unit respectively, the first control unit is further connected with the second switch module, the bypass unit is further connected with the activation module, and the battery detection unit is further used for connecting the battery.

[0016] The battery detection unit is used for detecting a battery voltage of the battery, and outputting a driving signal when the battery voltage is greater than a voltage threshold.

[0017] The first control unit is used for transmitting the activation signal to the first switch module to make the first switch module conductive when the activation signal is received.

[0018] The control signal is outputted when the activation signal is received and the driving signal is received, so that the second switch module is made conductive based on the control signal.

[0019] The bypass unit is configured to receive the control signal and start working according to the control signal to bypass the activation signal transmitted to the first switch module, so as to control the first switch module to be turned off.

[0020] The bypass unit stops working when the control signal is not received.

[0021] Optionally, the detection control module further comprises a delay unit.

[0022] The delay unit is connected with the activation module, the bypass unit and the first switch module respectively.

[0023] The delay unit is configured to receive the activation signal and input the activation signal to the first switch module after delaying for a preset time when the bypass unit stops working, so as to turn on the first switch module.

[0024] Optionally, the first control unit comprises a switch tube Q10, a switch tube Q11 and a resistor R18.

[0025] The control end of the switch tube Q10 is connected with the activation module, the first end of the switch tube Q10 is connected with the control end of the switch tube Q11, the second end of the switch tube Q10 is grounded, the first end of the switch tube Q11 is connected with the battery detection unit, the second end of the switch tube Q11 is grounded through the resistor R18, and the second end of the switch tube Q11 is further connected with the second switch module and the bypass unit respectively.

[0026] Optionally, the first switch module comprises a switch tube Q13, a switch tube Q14, a resistor R21, a resistor R22, a resistor R23 and a resistor R24.

[0027] The control end of the switch tube Q14 is connected with the detection control module through the resistor R22, the first end of the switch tube Q14 is connected with the control end of the switch tube Q13 through the resistor R21, the second end of the switch tube Q14 is grounded through the resistor R24, the control end of the switch tube Q13 is further connected with the second end of the switch tube Q13 through the resistor R23, the first end of the switch tube Q13 is connected with the activation module, and the second end of the switch tube Q13 is further used for connecting an auxiliary source.

[0028] Optionally, the second switch module comprises a switch tube Q19, a switch tube Q18, a diode D14, a resistor R29, a resistor R30 and a resistor R31.

[0029] The control end of the switch tube Q19 is connected with the cathode of the diode D14 through the resistor R29, the anode of the diode D14 is connected with the first control unit, the first end of the switch tube Q19 is connected with the control end of the switch tube Q18 through the resistor R31, the second end of the switch tube Q19 is used for grounding, the control end of the switch tube Q18 is also connected with the first end of the switch tube Q18 through the resistor R30, the first end of the switch tube Q18 is also connected with the battery, and the second end of the switch tube Q18 is connected with the auxiliary source.

[0030] Optionally, the activation module comprises a photovoltaic detection unit, a second control unit and an activation signal generation unit.

[0031] The photovoltaic detection unit is connected with the second control unit, the second control unit is connected with the activation signal generation unit and the first switch module respectively, the activation signal generation unit is also connected with the detection control module, and the photovoltaic detection unit and the second control unit are also used for being connected with the photovoltaic input source.

[0032] The photovoltaic detection unit is used for detecting the input voltage of the photovoltaic input source, and when the input voltage is greater than a first preset value, the second control unit is controlled to start working, so that the second control unit transmits the input voltage of the photovoltaic input source.

[0033] The activation signal generation unit is used for receiving and storing the input voltage after the second control unit starts working, and outputting an activation signal based on the stored voltage.

[0034] The output of the activation signal is stopped when the stored voltage is greater than a preset voltage, wherein the preset voltage is less than the first preset value.

[0035] Optionally, the activation signal generation unit comprises a switch tube Q6, a resistor R10, a resistor R11, a diode D5 and a capacitor C1.

[0036] The first end of the switch tube Q6 is connected with the second control unit, the first end of the switch tube Q6 is also connected with the control end of the switch tube Q6 through the resistor R10, the control end of the switch tube Q6 is also connected with the anode of the diode D5 through the resistor R11, the cathode of the diode D5 is grounded through the capacitor C1, and the second end of the switch tube Q6 is also connected with the detection control module.

[0037] Optionally, the power supply control circuit further comprises a reset control module.

[0038] The reset control module is connected with the activation signal generation unit and the second control unit respectively, and is also connected with the photovoltaic input source.

[0039] The reset control module is configured to start working according to the input voltage of the photovoltaic input source when the input voltage of the photovoltaic input source is less than a first preset value and greater than a second preset value, so as to discharge the voltage stored in the activation signal generation unit.

[0040] The discharging of the voltage stored in the activation signal generation unit is stopped when the second control unit starts working, wherein the first preset value is greater than the second preset value.

[0041] To solve the above technical problems, another technical solution adopted by the embodiment of the present application is to provide an energy storage system, which comprises:

[0042] A photovoltaic input source;

[0043] A battery;

[0044] An auxiliary source; and

[0045] A power supply control circuit as described above.

[0046] Different from the related art, the present application provides a power supply control circuit and an energy storage system, wherein the power supply control circuit comprises an activation module, a detection control module, a first switch module and a second switch module; the activation module is connected with the detection control module, the first switch module and a photovoltaic input source respectively; the first switch module is also connected with the detection control module and an auxiliary source; and the second switch module is connected with the detection control module, an auxiliary source and a battery respectively. The activation module is configured to detect the input voltage of the photovoltaic input source, and output an activation signal when the input voltage is greater than a first preset value, so as to start the energy storage system when the photovoltaic input source is stable. The detection control module is configured to detect the battery voltage of the battery, and output a control signal to the second switch module when the activation signal is received and the battery voltage is greater than a voltage threshold, so as to make the second switch module conductive, thereby supplying power to the auxiliary source by the battery when the battery has sufficient power, and further improving the stability of the energy storage system; and when the activation signal is received and the battery voltage is less than the voltage threshold, the activation signal is transmitted to the first switch module, so as to make the first switch module conductive, thereby automatically switching the auxiliary source to be supplied by the photovoltaic input source when the battery is under voltage, so that the auxiliary source can also work continuously when the battery is under voltage, thereby realizing seamless connection of auxiliary power supply, and further improving the reliability of the energy storage system. BRIEF DESCRIPTION OF DRAWINGS

[0047] One or more embodiments are illustrated by way of example in the figures that are not intended to be limiting of the embodiments. Like references numerals in the figures indicate like elements, unless otherwise expressly provided. The figures in the drawings are not necessarily drawn to scale, with emphasis instead being placed upon illustrating the principles of the embodiments.

[0048] Figure 1 is a structural block diagram of an energy storage system provided by an embodiment of the present application;

[0049] Figure 2 is a structural block diagram of a power supply control circuit provided by an embodiment of the present application;

[0050] Figure 3 is a circuit diagram of a power supply control circuit provided by an embodiment of the present application;

[0051] Figure 4 is a circuit diagram of another power supply control circuit provided by an embodiment of the present application;

[0052] Figure 5 is a circuit diagram of still another power supply control circuit provided by an embodiment of the present application;

[0053] Figure 6 is a structural block diagram of a power supply control circuit provided by another embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0055] It should be noted that the various features of the embodiments of the present application can be combined with each other if there is no conflict, and are within the protection scope of the present application. In addition, although the functional modules are divided in the device schematic diagram, and the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order from the module division in the device schematic diagram or the order in the flowchart.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety.

[0057] Please refer to Figure 1 , Figure 1 is a structural block diagram of an energy storage system provided by an embodiment of the present application, as Figure 1As shown, the energy storage system 1 comprises a photovoltaic input source 100, a battery 200, an auxiliary source 300 and a power supply control circuit 400; the power supply control circuit 400 is connected with the photovoltaic input source 100, the battery 200 and the auxiliary source 300 respectively; the power supply control circuit 400 is used for receiving the input voltage of the photovoltaic input source 100 and starting to work when the input voltage of the photovoltaic input source 100 is greater than a first preset value. When the power supply control circuit 400 starts to work, the battery voltage of the battery 200 will be received and detected, and when the battery voltage of the battery 200 is greater than a voltage threshold value, it is determined that the battery 200 has sufficient power, that is, it is not in an under-voltage state, at this time the power supply control circuit 400 will activate the auxiliary source 300 based on the battery voltage to make the auxiliary source 300 start to work. When the battery voltage is less than the voltage threshold value, it is considered that the battery 200 is in an under-voltage state, at this time in order to avoid over-discharge of the battery 200, the power supply control circuit 400 will input the input voltage of the photovoltaic input source 100 to the auxiliary source 300 to activate the auxiliary source 300. Based on this, the power supply mode of the auxiliary source 300 can be automatically switched based on the battery capacity, thereby realizing seamless connection of auxiliary source power supply, and further improving the reliability of the energy storage system 1.

[0058] In yet another embodiment, please refer to Figure 2 , Figure 2 is a structural block diagram of a power supply control circuit provided by an embodiment of the application, as Figure 2 shown, the power supply control circuit 400 comprises an activation module 41, a detection control module 42, a first switch module 43 and a second switch module 44;

[0059] The activation module 41 is connected with the detection control module 42, the first switch module 43 and the photovoltaic input source 100 respectively, the first switch module 43 is also connected with the detection control module 42 and the auxiliary source 300, and the second switch module 44 is connected with the detection control module 42, the auxiliary source 300 and the battery 200 respectively;

[0060] The activation module 41 is used for detecting the input voltage of the photovoltaic input source 100 and outputting an activation signal when the input voltage is greater than a first preset value;

[0061] The detection control module 42 is used for detecting the battery voltage of the battery 200 and outputting a control signal to the second switch module 44 when the activation signal is received and the battery voltage is greater than a voltage threshold value, so that the second switch module 44 is turned on, and the battery 200 supplies power to the auxiliary source 300; and

[0062] When the activation signal is received and the battery voltage is less than the voltage threshold, the activation signal is transmitted to the first switch module 43 to turn on the first switch module 43, so that the photovoltaic input source 100 supplies power to the auxiliary source 300.

[0063] Specifically, when the photovoltaic input source 100 is connected to the power supply control circuit 400, the photovoltaic input source 100 will input a corresponding input voltage according to the light condition. At this time, the activation module 41 will receive the input voltage and determine whether the input voltage is greater than a first preset value. When the input voltage is greater than the first preset value, the activation module 41 will output an activation signal to the detection control module 42. When the detection control module 42 receives the activation signal, it will detect the battery voltage of the battery 200, and when the battery voltage is greater than the voltage threshold, it will output a control signal to the second switch module 44 to turn on the second switch module 44 based on the control signal, so that the battery 200 outputs the battery voltage to the auxiliary source 300 through the second switch module 44 to activate the auxiliary source 300, thereby supplying power to the auxiliary source 300.

[0064] If the detection control module 42 detects that the battery voltage is less than the voltage threshold when the activation signal is received, the detection control module 42 will transmit the activation signal to the first switch module 43 to turn on the first switch module 43 based on the activation signal, so that the input voltage of the photovoltaic input source 100 is input to the auxiliary source 300 through the first switch module 43, thereby causing the auxiliary source 300 to start working based on the input voltage.

[0065] In yet another embodiment, when the detection control module 42 outputs a control signal, i.e. when the detection control module 42 receives the activation signal and the battery voltage is greater than the voltage threshold, the detection control module 42 will also bypass the activation signal transmitted to the first switch module 43 to ensure that the first switch module 43 is in an off state, so that the battery 200 supplies power to the auxiliary source 300 alone.

[0066] It is to be noted that the voltage of the battery is more stable than that of the photovoltaic input source, and thus the battery needs to be controlled to supply power to the auxiliary source when the battery has power. In this embodiment, when the detection control module 42 receives the activation signal and the voltage of the battery is greater than the voltage threshold, on one hand, the detection control module 42 outputs a control signal to the second switch module 44 to control the battery 200 to supply power to the auxiliary source 300, thereby activating the auxiliary source 300; on the other hand, the detection control module 42 bypasses the activation signal transmitted to the first switch module 43, so that the first switch module 43 is in an off state, and the battery 200 supplies power to the auxiliary source 300. That is, the detection control module 42 transmits the activation signal to the first switch module 43 only when the detection control module 42 receives the activation signal and the voltage of the battery is less than the voltage threshold, so that the first switch module 43 is turned on.

[0067] In another embodiment, the detection control module 42 is further configured to, when the detection control module 42 receives the activation signal and the voltage of the battery is less than the voltage threshold, delay the activation signal for a preset time and then transmit the activation signal to the first switch module 43. When the activation module 41 outputs the activation signal, the detection control module 42 receives and stores the activation signal. If the voltage of the battery is greater than the voltage threshold, the detection control module 42 bypasses the stored activation signal, so that the stored activation signal is not transmitted to the first switch module 43, and the first switch module 43 is turned on. If the voltage of the battery is less than the voltage threshold, the stored activation signal is not bypassed, and the detection control module 42 transmits the activation signal to the first switch module 43 after delaying the activation signal for a preset time, so that the first switch module 43 is turned on. It is to be noted that when the detection control module 42 receives the activation signal, the detection control module 42 determines whether the voltage of the battery is greater than the voltage threshold. In order to avoid the activation signal being transmitted to the first switch module 43 during the determination process, the detection control module 42 stores the activation signal input to the first switch module 43. If the voltage of the battery is greater than the voltage threshold, the stored activation signal is bypassed to avoid the first switch module 43 being turned on. If the voltage of the battery is less than the voltage threshold, the activation signal input to the first switch module 43 can be output after being delayed for a preset time, thereby avoiding the photovoltaic input source 100 supplying power to the auxiliary source 300 when the battery 200 has power.

[0068] In some embodiments, as shown in FIG. 4, the detection control module 42 includes a battery detection unit 421, a first control unit 422, and a bypass unit 423. Figure 2

[0069] ​The first control unit 422 is connected with the activation module 41, the battery detection unit 421, the first switch module 43 and the bypass unit 423 respectively, and is also connected with the second switch module 44; the bypass unit 423 is also connected with the activation module 41; and the battery detection unit 421 is also used for connecting the battery 200;

[0070] The battery detection unit 421 is used for detecting the battery voltage of the battery 200, and outputs a driving signal when the battery voltage is greater than a voltage threshold value;

[0071] The first control unit 422 is used for, when receiving the activation signal, transmitting the activation signal to the first switch module 43, so as to make the first switch module 43 conductive; and

[0072] The second control unit 442 is used for, when receiving the activation signal and receiving the driving signal, outputting a control signal, so as to make the second switch module 44 conductive based on the control signal;

[0073] The bypass unit 423 is used for receiving the control signal, and starts to work according to the control signal, so as to bypass the activation signal transmitted to the first switch module 43, thereby controlling the first switch module 43 to be disconnected; and

[0074] The bypass unit 423 stops working when not receiving the control signal.

[0075] Specifically, the battery detection unit 421 detects the battery voltage of the battery 200 in real time, and outputs the driving signal when the battery voltage is greater than the voltage threshold value, and stops outputting the driving signal when the battery voltage is less than the voltage threshold value.

[0076] After the activation module 41 outputs the activation signal, the first control unit 422 receives the activation signal and transmits it to the first switch module 43. Simultaneously, the first control unit 422 determines whether it has received the drive signal. If it has, it outputs a control signal to the second switch module 44 and the bypass unit 423. Upon receiving the control signal, the second switch module 44 is turned on, allowing the battery voltage to be transmitted to the auxiliary power source 300. Upon receiving the control signal, the bypass unit 423 begins operation, bypassing the activation signal transmitted to the first switch module 43, thus preventing the activation signal from being input to the first switch module 43 and causing it to turn off. This allows the battery 200 to supply power to the auxiliary power source 300 independently, avoiding the impact of unstable input voltage from the photovoltaic input source 100.

[0077] When the first control unit 422 does not receive the drive signal, it does not output the control signal, thereby turning off the second switch module 44 and stopping the bypass unit 423. At this time, the first control unit 422 successfully transmits the activation signal to the first switch module 43, causing the first switch module 43 to turn on based on the activation signal. Once the first switch module 43 is turned on, the input voltage of the photovoltaic input source 100 is transmitted to the auxiliary source 300 through the first switch module 43, thereby supplying power to the auxiliary source 300.

[0078] In yet another embodiment, such as Figure 2 As shown, the detection control module 42 further includes a delay unit 424;

[0079] The delay unit 424 is connected to the activation module 41, the bypass unit 423 and the first switch module 43 respectively;

[0080] The delay unit 424 is used to receive the activation signal and, when the bypass unit 423 stops working, delays the activation signal for a preset time before inputting it to the first switch module 43 so that the first switch module 43 is turned on.

[0081] Specifically, when the first control unit 422 transmits the activation signal to the first switch module 43, the delay unit 424 receives and stores the activation signal transmitted to the first switch module 43. When the bypass unit 423 starts working, the activation signal is discharged through the bypass unit 423, thereby preventing the first switch module 43 from being turned on; and when the first control unit 422 stops outputting the control signal, the bypass unit 423 stops working. At this time, the activation signal will not be discharged through the bypass unit 423, and the delay unit 424 will input the activation signal to the first switch module 43 after a preset delay, thereby controlling the first switch module 43 to be turned on.

[0082] It should be noted that when the first control unit 422 transmits the activation signal to the first switch module 43, the first switch module 43 will be turned on, and the photovoltaic input source 100 will supply power to the auxiliary source 300 through the first switch module 43. However, the input voltage of the photovoltaic input source 100 is unstable, which can easily lead to safety issues with the auxiliary source 300. Therefore, by introducing the delay unit 424, when the first control unit 422 transmits the activation signal to the first switch module 43, the delay unit 424 will receive the activation signal to avoid the situation where the first switch module 43 is turned on (photovoltaic power supply) when the battery voltage is greater than the voltage threshold. Based on this, the battery 200 can be prioritized to supply power to the auxiliary source 300 when it has power. Only when the battery voltage of the battery 200 is lower than the voltage threshold (undervoltage) will the photovoltaic input source 100 supply power to the auxiliary source 300, thereby avoiding over-discharge of the battery 200.

[0083] In some embodiments, please refer to Figure 3 , Figure 3 This is a circuit diagram of a power supply control circuit provided in an embodiment of the present invention, such as... Figure 3 As shown, the battery detection unit 421 includes a diode D7, a Zener diode D9, and a resistor R16;

[0084] The anode of the diode D7 is connected to the battery 200, the cathode of the diode D7 is connected to the cathode of the Zener diode D9, and the anode of the Zener diode D9 is connected to the first control unit 422 through the resistor R16.

[0085] Specifically, when the power supply control circuit 400 starts to work, the battery voltage of the battery 200 is input to the voltage stabilizer D9 through the diode D7. At this time, if the battery voltage is greater than the voltage stabilizing value of the voltage stabilizer D9, the voltage stabilizer D9 is broken down, thereby outputting a driving signal to the first control unit 422; if the battery voltage is less than the voltage stabilizing value of the voltage stabilizer D9, the voltage stabilizer D9 is in a cut-off state, and the first control unit 422 does not receive the driving signal. It should be noted that the voltage threshold is determined according to the voltage stabilizing value of the voltage stabilizer D9, and the selection of the voltage stabilizer D9 is determined according to the battery 200. By selecting a voltage stabilizer with a suitable voltage stabilizing value, the over-discharge of the battery 200 is avoided.

[0086] In yet another embodiment, as shown in Figure 3 , the first control unit 422 includes a switch tube Q10, a switch tube Q11 and a resistor R18.

[0087] The control end of the switch tube Q10 is connected with the activation module 41, the first end of the switch tube Q10 is connected with the control end of the switch tube Q11, the second end of the switch tube Q10 is grounded, the first end of the switch tube Q11 is connected with the battery detection unit 421, the second end of the switch tube Q11 is grounded through the resistor R18, and the second end of the switch tube Q11 is also connected with the second switch module 44 and the bypass unit 423 respectively.

[0088] When the activation module 41 outputs an activation signal, the switch tube Q10 is turned on based on the activation signal, and the activation signal is also transmitted to the first switch module 43. At this time, if the battery detection unit 421 outputs a driving signal, the switch tube Q11 is also turned on, thereby outputting a control signal to the second switch module 44 and the bypass unit 423. When the switch tube Q10 is turned on, the switch tube Q11 does not receive the driving signal, and the switch tube Q11 is cut off, thereby stopping the output of the control signal.

[0089] In another embodiment, please refer to Figure 4 , Figure 4 is another power supply control circuit provided by the embodiment of the application, as shown in Figure 4 , the second switch module 44 includes a switch tube Q19, a switch tube Q18, a diode D14, a resistor R29, a resistor R30 and a resistor R31.

[0090] The control terminal of the switch Q19 is connected to the cathode of the diode D14 through the resistor R29. The anode of the diode D14 is connected to the first control unit 422. The first terminal of the switch Q19 is connected to the control terminal of the switch Q18 through the resistor R31. The second terminal of the switch Q19 is grounded. The control terminal of the switch Q18 is also connected to the first terminal of the switch Q18 through the resistor R30. The first terminal of the switch Q18 is also connected to the battery 200. The second terminal of the switch Q18 is connected to the auxiliary power source 300.

[0091] Specifically, when the first control unit 422 outputs a control signal, the control terminal of the switch Q19 receives the control signal through the resistor R29 and the diode D14, and turns on according to the control signal. When the switch Q19 turns on, the voltage at the control terminal of the switch Q18 is pulled low, thereby turning on the switch Q18. When the switch Q18 turns on, the battery voltage of the battery 200 can supply power to the auxiliary power source 300 through the switch Q18.

[0092] In yet another embodiment, such as Figure 3 As shown, the bypass unit 423 includes a resistor R19 and a switching transistor Q12; the delay unit 424 includes a resistor R38 and a capacitor C2.

[0093] The control terminal of the switch Q12 is connected to the first control unit 422 through the resistor R19, the first terminal of the switch Q12 is connected to the activation module 41, and the second terminal of the switch Q12 is used for grounding.

[0094] The first end of the capacitor C2 is connected to the activation module 41 and the bypass unit 423 respectively through the resistor R38, and the second end of the capacitor C2 is used for grounding.

[0095] Specifically, when the activation module 41 outputs the activation signal, the first control unit 422 receives the activation signal, and the capacitor C2 also receives the activation signal transmitted to the first switch module 43 and starts charging based on the activation signal. At this time, if the battery voltage is greater than the voltage threshold, the first control unit 422 outputs a control signal, and the switch tube Q12 is turned on based on the control signal. When the switch tube Q12 is turned on, the activation signal transmitted to the first switch module 43 is discharged through the switch tube Q12, and the capacitor C2 is also discharged through the resistor R38 and the switch tube Q12, thereby bypassing the activation signal and ensuring that the first switch module 43 is in an off state. If the first control unit 422 does not output the control signal, the switch tube Q12 is in a cut-off state, and at this time the capacitor C2 continuously receives the activation signal transmitted to the first switch module 43 and outputs the activation signal to the first switch module 43 after a delay of a predetermined time, so that the first switch module 43 is turned on.

[0096] In yet another embodiment, as shown in Figure 3 The first switch module 43 includes a switch tube Q13, a switch tube Q14, a resistor R21, a resistor R22, a resistor R23, and a resistor R24.

[0097] The control end of the switch tube Q14 is connected to the detection control module 42 through the resistor R22, the first end of the switch tube Q14 is connected to the control end of the switch tube Q13 through the resistor R21, the second end of the switch tube Q14 is grounded through the resistor R24, the control end of the switch tube Q13 is also connected to the second end of the switch tube Q13 through the resistor R23, the first end of the switch tube Q13 is connected to the activation module 41, and the second end of the switch tube Q13 is also used to connect the auxiliary source 300.

[0098] Specifically, when the detection control module 42 transmits the activation signal to the first switch module 43, the control end of the switch tube Q14 receives the activation signal and is turned on based on the activation signal, and when the switch tube Q14 is turned on, the switch tube Q13 is also turned on. When the switch tube Q13 is turned on, the input voltage of the photovoltaic input source 100 can be input to the auxiliary source 300 through the activation module 41 and the switch tube Q13 to supply power to the auxiliary source 300. Based on this, the auxiliary source 300 can be powered by the photovoltaic input source 100 when the battery 200 is under-voltage, thereby maintaining the working state of the auxiliary source 300 while avoiding over-discharge of the battery 200.

[0099] In some embodiments, the first switch module 43 further comprises a diode D11 and a resistor R35; a cathode of the diode D11 is connected with the switch tube Q14, and an anode of the diode D11 is connected with the auxiliary power supply 300 through the resistor R35.

[0100] It can be known that the activation signal is a single pulse signal, when the activation signal stops, the switch tube Q14 is turned off, and the switch tube Q13 is also turned off, at this time, the photovoltaic input source 100 stops supplying power to the auxiliary power supply 300. Therefore, in order to make the auxiliary power supply 300 continue to work, when the auxiliary power supply 300 starts to work based on the input voltage of the photovoltaic input source 100, the auxiliary power supply 300 also outputs an auxiliary power supply voltage to the control end of the switch tube Q14 through the diode D11, so as to make the switch tube Q14 maintain a conduction state. Based on this, the first switch module 43 can still be controlled to maintain a conduction state after the activation signal ends, so as to make the photovoltaic input source 100 continuously supply power to the auxiliary power supply 300.

[0101] In still another embodiment, as shown in Figure 3 the first switch module 43 further comprises a diode D10, a cathode of the diode D10 is connected with the control end of the switch tube Q14, and an anode of the diode D10 is connected with the delay unit 424. Wherein, through the unidirectional conduction of the diode, the auxiliary power supply voltage output by the auxiliary power supply 300 can be prevented from flowing back to the delay unit 424.

[0102] In still another embodiment, as shown in Figure 4 the energy storage system 1 further comprises a controller (not shown in the figure), and the second switch module 44 further comprises a diode D13. An anode of the diode D13 is connected with the controller, and a cathode of the diode D13 is connected with the switch tube Q19 through the resistor R29.

[0103] Specifically, when the battery 200 outputs the battery voltage to activate the auxiliary power supply 300, the auxiliary power supply 300 starts to work based on the battery voltage, at this time, the controller continuously outputs a conduction control signal to the control end of the switch tube Q19 through the diode D13, so as to make the switch tube Q19 maintain a conduction state, thereby making the battery 200 continuously supply power to the auxiliary power supply 300.

[0104] In another embodiment, as shown in Figure 3 the first switch module 43 further comprises a switch tube Q15 and a resistor R25, a control end of the switch tube Q15 is connected with the controller through the resistor R25, a first end of the switch tube Q15 is connected with the control end of the switch tube Q14, and a second end of the switch tube Q15 is used for grounding.

[0105] It can be known that when the auxiliary power supply 300 starts to work based on the battery voltage, the controller also inputs the turn-on control signal to the switch tube Q15 through the resistor R25, so that the switch tube Q15 is turned on. When the switch tube Q15 is turned on, the control end voltage of the switch tube Q14 is pulled low, so that the switch tube Q14 is maintained in the off state, and the switch tube Q13 is also maintained in the off state. Based on this, the false turn-on of the switch tube Q14 can be avoided, thereby improving the reliability of the power supply control circuit 400.

[0106] In some embodiments, when the battery voltage of the battery 200 is lower than the voltage threshold (battery undervoltage), after the auxiliary power supply 300 is activated by the photovoltaic input source 100, the photovoltaic input source 100 not only supplies power to the auxiliary power supply 300, but also inputs the input voltage to the battery 200 to charge the battery 200. When the battery voltage of the battery 200 is greater than the voltage threshold after charging, the controller outputs the turn-on control signal to the switch tube Q19 through the diode D13, so that the switch tube Q19 is turned on, so as to switch to the battery 200 supplying power to the auxiliary power supply 300, thereby improving the stability of the power supply control circuit 400.

[0107] In some embodiments, as shown in Figure 2 The activation module 41 includes a photovoltaic detection unit 411, a second control unit 412, and an activation signal generation unit 413.

[0108] The photovoltaic detection unit 411 is connected with the second control unit 412, the second control unit 412 is respectively connected with the activation signal generation unit 413 and the first switch module 43, the activation signal generation unit 413 is also connected with the detection control module 42, and the photovoltaic detection unit 411 and the second control unit 412 are also connected with the photovoltaic input source 100.

[0109] The photovoltaic detection unit 411 is configured to detect the input voltage of the photovoltaic input source 100, and control the second control unit 412 to start working when the input voltage is greater than a first preset value, so that the second control unit 412 transmits the input voltage of the photovoltaic input source 100.

[0110] The activation signal generation unit 413 is configured to receive and store the input voltage after the second control unit 412 starts to work, and output an activation signal based on the stored voltage; and

[0111] stop outputting the activation signal when the stored voltage is greater than a preset voltage, wherein the preset voltage is less than the first preset value.

[0112] Specifically, when the photovoltaic input source 100 outputs the input voltage, the photovoltaic detection unit 411 receives and detects the input voltage of the photovoltaic input source 100, and controls the second control unit 412 to start working when the input voltage is greater than a first preset value. When the second control unit 412 starts working, the input voltage of the photovoltaic input source 100 is input to the activation signal generation unit 413 through the second control unit 412. When the activation signal generation unit 413 receives the input voltage, it stores the input voltage and outputs an activation signal based on the stored voltage; and when the voltage stored by the activation signal generation unit 413 is greater than a preset voltage, the activation signal generation unit 413 stops outputting the activation signal.

[0113] In some embodiments, referring to Figure 5 , Figure 5 is another power supply control circuit provided by the embodiment of the application, as shown in Figure 5 the photovoltaic detection unit 411 includes a voltage stabilizing tube D2, a switch tube Q2, a resistor R2 and a resistor R4; the second control unit 412 includes a resistor R7, a resistor R8, a resistor R9, a switch tube Q4, a switch tube Q5 and a voltage stabilizing tube D4; the activation signal generation unit 413 includes a switch tube Q6, a resistor R10, a resistor R11, a diode D5 and a capacitor C1;

[0114] The switch tube Q2 is connected to the anode of the voltage stabilizing tube D2 through the resistor R2, the cathode of the voltage stabilizing tube D2 is connected to the photovoltaic input source 100, the first end of the switch tube Q2 is connected to the second control unit 412 through the resistor R4, and the second end of the switch tube Q2 is grounded.

[0115] The control end of the switch tube Q4 is connected to the photovoltaic detection unit 411, the first end of the switch tube Q4 is connected to the control end of the switch tube Q5 through the resistor R8, the second end of the switch tube Q4 is also grounded through the resistor R7, the first end of the switch tube Q5 is connected to the photovoltaic input source 100, the first end of the switch tube Q5 is also connected to the cathode of the voltage stabilizing tube D4, the anode of the voltage stabilizing tube D4 is connected to the control end of the switch tube Q5, the resistor R9 is connected in parallel with the voltage stabilizing tube D4, and the second end of the switch tube Q5 is connected to the activation signal generation unit 413 and the first switch module 43 respectively.

[0116] The first end of the switch tube Q6 is connected with the second control unit 412, and the first end of the switch tube Q6 is also connected with the control end of the switch tube Q6 through the resistor R10, the control end of the switch tube Q6 is also connected with the anode of the diode D5 through the resistor R11, the cathode of the diode D5 is grounded through the capacitor C1, and the second end of the switch tube Q6 is also connected with the detection control module 42.

[0117] Specifically, when the photovoltaic input source 100 is connected to the power supply control circuit 400, the voltage stabilizing tube D2 receives the input voltage of the photovoltaic input source 100, and if the input voltage is greater than the voltage stabilizing value of the voltage stabilizing tube D2, the voltage stabilizing tube D2 is broken down, and the switch tube Q2 is turned on. When the switch tube Q2 is turned on, the control end voltage of the switch tube Q4 is pulled down, so that the switch tube Q4 is turned on. When the switch tube Q4 is turned on, the switch tube Q5 is also turned on. At this time, the input voltage of the photovoltaic input source 100 charges the capacitor C1 through the switch tube Q5, the resistor R10, the resistor R11 and the diode D5, and the switch tube Q6 is also turned on. When the voltage at the end of the capacitor C1 gradually increases, the voltage drop between the resistor R10 is less than the on-voltage drop of the switch tube Q6, and the switch tube Q6 is turned off. Based on this, the on and off of the switch tube Q6 generates a pulse signal lasting for a period of time, and the pulse signal is input to the detection control module 42.

[0118] The voltage stabilizing tube D2 is selected based on the photovoltaic input source 100, and by setting a suitable voltage stabilizing value, the power supply control circuit 400 starts to work according to the input voltage of the photovoltaic input source 100 only when the input voltage of the photovoltaic input source 100 meets the requirements.

[0119] In another embodiment, the second control unit 412 further includes a resistor R6, and the resistor R6 is connected with the photovoltaic input source 100 and the control end of the switch tube Q4, respectively. The control end voltage of the switch tube Q4 is the input voltage of the photovoltaic input source 100 through the resistor R6, so as to avoid the mis-conduction of the switch tube Q4.

[0120] In some embodiments, as shown in Figure 2 The activation module 41 further includes an overvoltage detection unit 414.

[0121] The overvoltage detection unit 414 is connected with the photovoltaic input source 100 and the second control unit 412, respectively.

[0122] The overvoltage detection unit 414 is configured to detect the input voltage of the photovoltaic input source 100, and control the second control unit 412 to be turned off when the input voltage is greater than a third preset value, so as to stop outputting the input voltage of the photovoltaic input source 100. The third preset value is greater than the first preset value.

[0123] It can be known that when the input voltage of the photovoltaic input source 100 is greater than the third preset value, it is confirmed that the input voltage of the photovoltaic input source 100 is too large, at this time, by controlling the second control unit 412 to be turned off, the output of the input voltage is stopped, so as to avoid damaging the subsequent devices.

[0124] In some embodiments, as shown in Figure 5 The overvoltage detection unit 414 includes a switch tube Q3, a resistor R5 and a voltage stabilizing tube D3.

[0125] The control end of the switch tube Q3 is connected with the cathode of the voltage stabilizing tube D3 through the resistor R5, the anode of the voltage stabilizing tube D3 is configured to be grounded, the first end of the switch tube Q3 is connected with the photovoltaic input source 100, and the second end of the switch tube Q3 is connected with the second control unit 412.

[0126] Specifically, when the input voltage of the photovoltaic input source 100 is greater than the third preset value, the voltage stabilizing tube D3 is broken down, and the switch tube Q3 is also in a conducting state. At this time, due to the action of the resistor R4, even if the switch tube Q2 is in a conducting state, the voltage of the control end of the switch tube Q4 is still pulled high, so that the switch tube Q4 is turned off, and the switch tube Q5 is also turned off, thereby stopping outputting the input voltage of the photovoltaic input source 100.

[0127] In yet another embodiment, as shown in Figure 2 The power supply control circuit 400 further includes a reset control module 45.

[0128] The reset control module 45 is connected with the activation signal generation unit 413 and the second control unit 412 respectively, and the reset control module 45 is further connected with the photovoltaic input source 100.

[0129] The reset control module 45 is configured to start working according to the input voltage of the photovoltaic input source 100 when the input voltage of the photovoltaic input source 100 is less than the first preset value and greater than a second preset value, so as to discharge the voltage stored in the activation signal generation unit 413; and

[0130] Stop discharging the voltage stored in the activation signal generation unit 413 when the second control unit 412 starts working, wherein the first preset value is greater than the second preset value.

[0131] Specifically, when the input voltage of the photovoltaic input source 100 is less than a first preset value and greater than a second preset value, the photovoltaic detection unit 411 controls the second control unit 412 to stop working, at this time the input voltage of the photovoltaic input source 100 is input to the reset control module 45, so that the reset control module 45 starts working. When the reset control module 45 starts working, the activation signal generation unit 413 discharges the stored voltage through the reset control module 45. When the input voltage of the photovoltaic input source 100 is greater than the first preset value, the photovoltaic detection unit 411 controls the second control unit 412 to start working, at this time the reset control module 45 stops working. And because the voltage stored in the activation signal generation unit 413 has been discharged, the activation signal generation unit 413 receives and stores the input voltage again to output the activation signal. Based on this, when the photovoltaic input source 100 is accessed again, the activation signal can be accurately output, thereby improving the reliability of the power supply control circuit 400.

[0132] In yet another embodiment, as shown in Figure 2 The reset control module 45 includes an under-voltage reset unit 451 and a third control unit 452.

[0133] The under-voltage reset unit 451 is connected with the activation signal generation unit 413 and the third control unit 452, and the third control unit 452 is also connected with the second control unit 412. The third control unit 452 and the under-voltage reset unit 451 are also used to be connected with the photovoltaic input source 100.

[0134] The under-voltage reset unit 451 is used to start working when the input voltage is less than a first preset value and greater than a second preset value, to discharge the voltage stored in the activation signal generation unit 413.

[0135] The third control unit 452 is used to control the under-voltage reset unit 451 to stop working after the second control unit 412 is turned on, so as to stop discharging the voltage stored in the activation signal generation unit 413.

[0136] When the input voltage of the photovoltaic input source 100 is less than the first preset value and greater than the second preset value, the photovoltaic detection unit 411 controls the second control unit 412 to stop working, at this time the input voltage of the photovoltaic input source 100 is input to the under-voltage reset unit 451, so that the under-voltage reset unit 451 starts working. When the under-voltage reset unit 451 starts working, the activation signal generation unit 413 discharges the stored voltage through the under-voltage reset unit 451. When the input voltage of the photovoltaic input source 100 is greater than the first preset value, the photovoltaic detection unit 411 controls the second control unit 412 to start working, so that the input voltage is input to the activation signal generation unit 413. After the second control unit 412 starts working, the third control unit 452 also starts working, so that the under-voltage reset unit 451 stops working. Based on this, the activation signal generation unit 413 can accurately output the activation signal.

[0137] In another embodiment, as shown in Figure 5 The under-voltage reset unit 451 includes a switch tube Q8 and resistors R12 and R13; the third control unit 452 includes a switch tube Q1, a resistor R3 and a resistor Q1.

[0138] The control end of the switch tube Q8 is connected with the third control unit 452 and the photovoltaic input source 100 through the resistor R13, respectively; the first end of the switch tube Q8 is connected with the capacitor C1 through the resistor R12; and the second end of the switch tube Q8 is grounded.

[0139] The control end of the switch tube Q1 is connected with the second end of the switch tube Q4 through the resistor R3; the first end of the switch tube Q1 is connected with the under-voltage reset unit 451; the first end of the switch tube Q1 is also connected with the photovoltaic input source 100 through the resistor R1; and the second end of the switch tube Q1 is also grounded.

[0140] When the input voltage of the photovoltaic input source 100 is less than the first preset value and greater than the second preset value, the input voltage will be input to the control end of the switch tube Q8 through the resistor R1 and the resistor R13, so that the switch tube Q8 is turned on. When the switch tube Q8 is turned on, the capacitor C1 starts to discharge through the resistor R12 and the switch tube Q8. When the second control unit 412 starts to work (that is, the switch tube Q4 is turned on), the input voltage of the photovoltaic input source 100 will be input to the control end of the switch tube Q1, so as to control the switch tube Q1 to be turned on. When the switch tube Q1 is turned on, the control end voltage of the switch tube Q8 is pulled low by the switch tube Q1, the switch tube Q8 is turned off, and when the switch tube Q8 is turned off, the capacitor C1 also stops discharging.

[0141] In some embodiments, as shown in FIG. 4, the power supply control circuit 400 further comprises a diode D6; an anode of the diode D6 is connected with the activation signal generation unit 413, and a cathode of the diode D6 is connected with the detection control module 42. Due to the one-way conduction characteristic of the diode D6, the energy stored in the capacitor C2 can be prevented from flowing back to the activation signal generation unit 413 when the activation signal generation unit 413 stops outputting the activation signal. Figure 5

[0142] In another embodiment, as shown in FIG. 5, the power supply control circuit 400 further comprises a fuse F1 and a diode D8; Figure 5

[0143] The fuse F1 is connected with the second end of the switch tube Q5 and the anode of the diode D8 respectively, and the cathode of the diode D8 is connected with the switch tube Q13. The fuse F1 is used to disconnect the output of the photovoltaic input source 100 when the input voltage of the photovoltaic input source 100 is too large, so as to avoid damaging the subsequent devices, thereby improving the safety of the energy storage system 1. The diode D8 is used to prevent the voltage of the auxiliary source 300 from flowing back to the photovoltaic input source 100.

[0144] In some embodiments, it should be noted that when the photovoltaic input source 100 supplies power to the auxiliary source 300, the input voltage of the photovoltaic input source 100 will be pulled down when the photovoltaic input source 100 is loaded. Therefore, if the input voltage of the photovoltaic input source 100 is just greater than the first preset value, the voltage input to the auxiliary source 300 will not be enough to activate the auxiliary source 300. When the auxiliary source 300 is not successfully activated, even if the input voltage of the photovoltaic input source 100 meets the activation condition of the auxiliary source 300 in the subsequent process, the auxiliary source 300 cannot be activated, so that the input voltage of the photovoltaic input source 100 cannot be effectively utilized, thereby causing a large amount of waste of resources. ​​

[0145] Based on this, please refer to Figure 6 , Figure 6 is a structural block diagram of a photovoltaic power supply circuit provided by another embodiment of the application, as Figure 6 indicated, the application introduces an indication module 46, which is connected with the first switch module 43 and the auxiliary source 300 respectively. When the input voltage of the photovoltaic input source 100 is output through the first switch module 43, if the auxiliary source 300 is activated by the input voltage, the auxiliary source 300 starts to work, thereby outputting a voltage signal to the indication module 46, so that the indication module 46 outputs a first indication signal. If the input voltage output through the first switch module 43 is insufficient to activate the auxiliary source 300, the input voltage will be input to the indication module 46, and when the indication module 46 receives the input voltage, it will output a second indication signal based on the input voltage. Based on this, in actual use, the user can determine whether the auxiliary source 300 is activated by observing the indication signal output by the indication module 46, so as to respond in time when the auxiliary source 300 is not activated, thereby avoiding the waste of resources.

[0146] In some embodiments, the first indication signal and the second indication signal can be different color indicator lights, for example, the first indication signal is a green light, and the second indication signal is a red light; or they can be the same color but different states, for example, the first indication signal is that the indicator light is always on, and the second indication signal is that the indicator light is off or flashes. It should be noted that the first indication signal and the second indication signal are mainly used to distinguish the two states of the activated auxiliary source 300 and the unactivated auxiliary source 300, which are not limited here.

[0147] In another embodiment, the indication module 46 is further used to output the second indication signal after receiving the input voltage for a target time, wherein the target time is greater than the time used by the auxiliary source 300 to be powered on and activated to output the voltage signal.

[0148] Specifically, when the first switch module 43 outputs the input voltage of the photovoltaic input source 100, the indication module 46 and the auxiliary source 300 will both receive the input voltage. At this time, the indication module 46 will prolong the target time to respond to the input voltage. Within the target time, if the input voltage successfully activates the auxiliary source 300, the auxiliary source 300 will output a voltage signal to the indication module 46, so that the indication module 46 outputs a first indication signal based on the voltage signal. If the auxiliary source 300 is not activated, the indication module 46 will output a second indication signal based on the received input voltage after the target time.

[0149] In still another embodiment, asFigure 6 As shown, the indication module 46 comprises a delay control unit 461, a lock unit 462 and an indication unit 463;

[0150] The delay control unit 461 is connected with the indication unit 463, the lock unit 462 and the first switch module 43 respectively, and the indication unit 463 and the lock unit 462 are also connected with the auxiliary power source 300;

[0151] The lock unit 462 is configured to output a lock signal to the delay control unit 461 when receiving the voltage signal;

[0152] The delay control unit 461 is configured to control the indication unit 463 to output the first indication signal when receiving the lock signal;

[0153] When not receiving the lock signal, the indication unit 463 is controlled to output a second indication signal in response to the input voltage after a target time delay.

[0154] Specifically, when the first switch module 43 outputs the input voltage, the delay control unit 461 receives and stores the input voltage. If the auxiliary power source 300 is activated by the input voltage, the auxiliary power source 300 outputs a voltage signal to the lock unit 462. When the lock unit 462 receives the voltage signal, it outputs a lock signal to the delay control unit 461 based on the voltage signal, so that the delay control unit 461 controls the indication unit 463 to output a first indication signal. If the auxiliary power source 300 is not activated, the auxiliary power source 300 will not output the voltage signal, and the lock unit 462 will not output the lock signal. When the delay control unit 461 has not received the lock signal after a target time, the delay control unit 461 controls the indication unit 463 to output a second indication signal based on the stored input voltage, to prompt that the auxiliary power source 300 is not activated.

[0155] In some embodiments, as shown in FIG. 4, the delay control unit 461 comprises a switch tube Q9, a resistor R37, a resistor R15, a diode D17 and a capacitor C4; the lock unit 462 comprises a switch tube Q20 and a resistor R17; and the indication unit 463 comprises a resistor R14 and a light-emitting diode D16. Figure 4

[0156] ​The control end of the switch tube Q9 is connected with the anode of the diode D17, the control end of the switch tube Q9 is also grounded through the capacitor C4, the first end of the switch tube Q9 is connected with the indication unit 463, the second end of the switch tube Q9 is used for grounding, the cathode of the diode D17 is connected with the first switch module 43 and the auxiliary source 300 through the resistor R15, and the cathode of the diode D17 is also connected with the locking unit 462.

[0157] The control end of the switch tube Q20 is connected with the auxiliary source 300 through the resistor R17, the first end of the switch tube Q20 is connected with the delay control unit 461, and the second end of the switch tube Q20 is used for grounding.

[0158] The resistor R14 is connected with the first switch module 43 and the auxiliary source 300 respectively, the resistor R14 is also connected with the anode of the light-emitting diode D16, and the cathode of the light-emitting diode D16 is connected with the delay control unit 461.

[0159] When the first switch module 43 outputs the input voltage, the input voltage is input to the auxiliary source 300, and at the same time, the capacitor C4 is charged through the resistor R15, and in the process of charging the capacitor C4, if the auxiliary source 300 is activated, the auxiliary source 300 inputs the voltage signal to the control end of the switch tube Q20 through the resistor R17, so that the switch tube Q20 is turned on. When the switch tube Q20 is turned on, the control end voltage of the switch tube Q9 is pulled down by the switch tube Q20, so that the switch tube Q9 is turned off, and at this time, the light-emitting diode D16 is turned off. If the auxiliary source 300 is not activated, the auxiliary source 300 will not output the voltage signal, at this time, the switch tube Q20 is turned off, and after the target time, the control end of the switch tube Q9 receives the input voltage and is turned on based on the input voltage. When the switch tube Q9 is turned on, a voltage drop is generated across the light-emitting diode D16, the light-emitting diode D16 is turned on, thereby indicating that the auxiliary source 300 is not activated.

[0160] In another embodiment, it should be noted that since the input voltage of the photovoltaic input source 100 is affected by light, when the activation signal generation unit 413 outputs the activation signal based on the input voltage, the duration of the activation signal will be short, and at this time, if powered by the photovoltaic input source 100, the first switch module 43 will also be turned on for a short time, thereby causing the auxiliary source 300 to be unable to be activated. At this time, since the first switch module 43 is turned off, the auxiliary source 300 is also not activated, thereby causing the indication module 46 to have no power supply, and further being unable to correctly indicate the working state of the auxiliary source 300.

[0161] Based on this, as Figure 6 shown, the power supply control circuit 400 further comprises an energy storage module 47, which is connected to the common end of the first switch module 43 and the indication module 46, and is used to charge in response to the input voltage when the first switch module 43 is turned on; and

[0162] When the first switch module 43 is turned off, the indication module 46 is powered based on the stored electrical energy.

[0163] Specifically, when the first switch module 43 is turned on, the energy storage module 47 receives and stores the input voltage. At this time, if the auxiliary power supply 300 is activated, the indication module 46 responds to the voltage signal output by the auxiliary power supply 300 and outputs a first indication signal based on the voltage signal. If the auxiliary power supply 300 is not activated and the first switch module 43 is turned off, the energy storage module 47 outputs the stored voltage to the indication module 46, so that the indication module 46 outputs a second indication signal based on the voltage.

[0164] In yet another embodiment, as Figure 4 shown, the energy storage module 47 is a capacitor C5;

[0165] The first end of the capacitor C5 is connected to the first switch module 43 and the resistor R14, respectively, and the second end of the capacitor C5 is used for grounding.

[0166] The capacitor C5 is used to store energy when the first switch module 43 is turned on, and discharge when the auxiliary power supply 300 is not activated and the first switch module 43 is turned off, so that the indication module 46 outputs a second indication signal.

[0167] The embodiment of the present application provides a power supply control circuit, which comprises an activation module, a detection control module, a first switch module and a second switch module; the activation module is connected with the detection control module, the first switch module and a photovoltaic input source respectively; the first switch module is further connected with the detection control module and an auxiliary source; and the second switch module is connected with the detection control module, the auxiliary source and a battery respectively. The activation module is used for detecting an input voltage of the photovoltaic input source, and outputs an activation signal when the input voltage is greater than a first preset value, so as to start an energy storage system when the photovoltaic input source is stable. The detection control module is used for detecting a battery voltage of the battery, and outputs a control signal to the second switch module when the activation signal is received and the battery voltage is greater than a voltage threshold, so as to make the second switch module conductive, thereby supplying power to the auxiliary source by the battery when the battery has sufficient power, and further improving the stability of the energy storage system; and when the activation signal is received and the battery voltage is less than the voltage threshold, the activation signal is transmitted to the first switch module, so as to make the first switch module conductive, thereby automatically switching the photovoltaic input source to supply power to the auxiliary source when the battery is under-voltage, so that the auxiliary source can also work continuously when the battery is under-voltage, thereby realizing seamless connection of auxiliary power supply, and further improving the reliability of the energy storage system.

[0168] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; under the idea of the present application, 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 of different aspects of the present application as described above, which are not provided in details for simplicity; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power supply control circuit, characterized in that, The power supply control circuit includes an activation module, a detection control module, a first switch module, and a second switch module; The activation module is connected to the detection and control module, the first switch module and the photovoltaic input source respectively. The first switch module is also connected to the detection and control module and the auxiliary source respectively. The second switch module is connected to the detection and control module, the auxiliary source and the battery respectively. The activation module is used to detect the input voltage of the photovoltaic input source and output an activation signal when the input voltage is greater than a first preset value; The detection and control module is used to detect the battery voltage of the battery, and when it receives the activation signal and the battery voltage is greater than the voltage threshold, it outputs a control signal to the second switch module to turn on the second switch module, thereby enabling the battery to supply power to the auxiliary power source. as well as When the activation signal is received and the battery voltage is less than the voltage threshold, the activation signal is transmitted to the first switch module to turn on the first switch module, thereby enabling the photovoltaic input source to supply power to the auxiliary source. The detection and control module includes a battery detection unit, a first control unit, and a bypass unit. The first control unit is connected to the activation module, the battery detection unit, the first switch module, and the bypass unit respectively. The first control unit is also connected to the second switch module, the bypass unit is also connected to the activation module, and the battery detection unit is also used to connect to the battery. The battery detection unit is used to detect the battery voltage of the battery and output a drive signal when the battery voltage is greater than a voltage threshold. The first control unit is configured to transmit the activation signal to the first switch module upon receiving the activation signal, thereby turning on the first switch module; and Upon receiving the activation signal and the drive signal, a control signal is output to turn on the second switch module based on the control signal. The bypass unit is used to receive the control signal and start working according to the control signal to bypass the activation signal transmitted to the first switch module, thereby controlling the first switch module to open; and It stops working when the control signal is not received.

2. The power supply control circuit according to claim 1, characterized in that, The detection and control module is also used to bypass the activation signal transmitted to the first switch module when outputting a control signal, so as to control the first switch module to disconnect.

3. The power supply control circuit according to claim 2, characterized in that, The detection and control module is also used to transmit the activation signal to the first switch module after a preset delay when the activation signal is received and the battery voltage is less than a voltage threshold.

4. The power supply control circuit according to claim 3, characterized in that, The detection control module also includes a delay unit; The delay unit is connected to the activation module, the bypass unit, and the first switch module, respectively; The delay unit is used to receive the activation signal and, when the bypass unit stops working, delay the activation signal for a preset time before inputting it to the first switch module so that the first switch module is turned on.

5. The power supply control circuit according to claim 3, characterized in that, The first control unit includes a switch Q10, a switch Q11, and a resistor R18; The control terminal of the switch Q10 is connected to the activation module. The first terminal of the switch Q10 is connected to the control terminal of the switch Q11. The second terminal of the switch Q10 is grounded. The first terminal of the switch Q11 is connected to the battery detection unit. The second terminal of the switch Q11 is grounded through the resistor R18. The second terminal of the switch Q11 is also connected to the second switch module and the bypass unit.

6. The power supply control circuit according to claim 3, characterized in that, The first switching module includes a switching transistor Q13, a switching transistor Q14, a resistor R21, a resistor R22, a resistor R23, and a resistor R24; The control terminal of the switch Q14 is connected to the detection and control module through the resistor R22. The first terminal of the switch Q14 is connected to the control terminal of the switch Q13 through the resistor R21. The second terminal of the switch Q14 is grounded through the resistor R24. The control terminal of the switch Q13 is also connected to the second terminal of the switch Q13 through the resistor R23. The first terminal of the switch Q13 is connected to the activation module. The second terminal of the switch Q13 is also used to connect to an auxiliary power source.

7. The power supply control circuit according to claim 3, characterized in that, The second switching module includes a switching transistor Q19, a switching transistor Q18, a diode D14, a resistor R29, a resistor R30, and a resistor R31; The control terminal of the switching transistor Q19 is connected to the cathode of the diode D14 through the resistor R29. The anode of the diode D14 is connected to the first control unit. The first terminal of the switching transistor Q19 is connected to the control terminal of the switching transistor Q18 through the resistor R31. The second terminal of the switching transistor Q19 is grounded. The control terminal of the switching transistor Q18 is also connected to the first terminal of the switching transistor Q18 through the resistor R30. The first terminal of the switching transistor Q18 is also connected to the battery. The second terminal of the switching transistor Q18 is connected to the auxiliary power source.

8. The power supply control circuit according to any one of claims 1-7, characterized in that, The activation module includes a photovoltaic detection unit, a second control unit, and an activation signal generation unit; The photovoltaic detection unit is connected to the second control unit, the second control unit is connected to the activation signal generation unit and the first switch module respectively, the activation signal generation unit is also connected to the detection control module, and both the photovoltaic detection unit and the second control unit are also used to connect to the photovoltaic input source; The photovoltaic detection unit is used to detect the input voltage of the photovoltaic input source, and when the input voltage is greater than a first preset value, it controls the second control unit to start working, so that the second control unit transmits the input voltage of the photovoltaic input source; The activation signal generation unit is used to receive and store the input voltage after the second control unit starts working, and output an activation signal based on the stored voltage. as well as The activation signal is stopped when the stored voltage is greater than a preset voltage, wherein the preset voltage is less than the first preset value.

9. The power supply control circuit according to claim 8, characterized in that, The activation signal generation unit includes a switch Q6, a resistor R10, a resistor R11, a diode D5, and a capacitor C1. The first terminal of the switching transistor Q6 is connected to the second control unit. The first terminal of the switching transistor Q6 is also connected to the control terminal of the switching transistor Q6 through the resistor R10. The control terminal of the switching transistor Q6 is also connected to the anode of the diode D5 through the resistor R11. The cathode of the diode D5 is grounded through the capacitor C1. The second terminal of the switching transistor Q6 is also connected to the detection and control module.

10. The power supply control circuit according to claim 8, characterized in that, The power supply control circuit also includes a reset control module; The reset control module is connected to the activation signal generation unit and the second control unit respectively, and the reset control module is also connected to the photovoltaic input source; The reset control module is used to start working according to the input voltage of the photovoltaic input source when the input voltage of the photovoltaic input source is less than a first preset value and greater than a second preset value, so as to release the voltage stored in the activation signal generation unit. as well as When the second control unit starts working, the voltage stored in the activation signal generation unit is stopped from being discharged, wherein the first preset value is greater than the second preset value.

11. An energy storage system, characterized in that, The energy storage system includes: Photovoltaic input source; Battery; Auxiliary source; and The power supply control circuit as described in any one of claims 1-10.

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