Power supply control circuit and energy storage power supply

Abstract

The utility model provides a power supply control circuit and an energy storage power supply. The power supply control circuit is connected with the battery, the boost circuit and the power supply circuit. The power supply control circuit comprises a sampling module, a control module and a switching module. Wherein the sampling module is used for being connected with a battery, the control module is connected with the sampling module and the switching module, and the switching module is further connected with the battery, the booster circuit and the power supply circuit. Specifically, the sampling module is used for sampling a battery voltage to obtain a sampling voltage; the control module is used for outputting a first level signal when the sampling voltage is smaller than the reference voltage and outputting a second level signal when the sampling voltage is larger than the reference voltage; the switching module is used for controlling the connection between the booster circuit and the power supply circuit when receiving the first level signal; and when the second level signal is received, the power supply circuit is controlled to be connected with the battery. The power supply path can be selected according to the battery voltage condition, and the overall efficiency of the power supply system is improved.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a power supply control circuit and an energy storage power supply. Background Technology

[0002] Sodium-ion batteries have significant advantages in low-temperature and high-altitude environments due to their low-temperature resistance, and with technological advancements, they have broad application prospects in energy storage systems.

[0003] However, sodium-ion batteries have a wide voltage range. Taking a 10-cell sodium battery pack project as an example, the battery voltage is typically between 20V and 40V, while the panel power supply requires a voltage between 28V and 32V. This project first uses a boost circuit to raise the battery voltage to approximately 36V on the low-voltage side of the LLC circuit, and then uses a buck circuit to step it down to the voltage required by the panel. While this solution can meet the power supply requirements, it has drawbacks. When the battery voltage changes, especially when it is close to the target voltage, two stages of conversion are still required. This additional energy conversion results in losses, reducing the overall system efficiency. Optimization and improvement are urgently needed to enhance performance. Utility Model Content

[0004] This application provides a power supply control circuit and an energy storage power source, which can select the power supply path according to the battery voltage, thereby improving the overall efficiency of the power supply system and reducing energy consumption.

[0005] In a first aspect, embodiments of this application provide a power supply control circuit, which is connected to a battery, a boost circuit, and a power supply circuit. The power supply control circuit includes a sampling module, a control module, and a switching module. The sampling module is connected to the battery, the control module is connected to both the sampling module and the switching module, and the switching module is also connected to the battery, the boost circuit, and the power supply circuit. The sampling module samples the battery voltage to obtain a sampled voltage. The control module outputs a first-level signal when the sampled voltage is less than a reference voltage, and outputs a second-level signal when the sampled voltage is greater than the reference voltage. The switching module controls the connection between the boost circuit and the power supply circuit upon receiving the first-level signal, and controls the connection between the power supply circuit and the battery upon receiving the second-level signal.

[0006] In some embodiments, the control module includes a comparator U1A. The non-inverting input of the comparator U1A is connected to the reference voltage, the inverting input of the comparator U1A is connected to the sampling module, and the output of the comparator U1A is connected to the switching module.

[0007] In some embodiments, the control module further includes a switch Q6, a resistor R3, and a resistor R6. The first end of the resistor R6 is connected to the output of the comparator U1A, the second end of the resistor R6 is connected to the control terminal of the switch Q6, the first end of the resistor R3 is connected to both the inverting input of the comparator U1A and the sampling module, the second end of the resistor R3 is connected to the first end of the switch Q6, and the second end of the switch Q6 is grounded.

[0008] In some embodiments, the switching module includes a driving unit and a switching unit. The control terminal of the driving unit is connected to the control module, and the control terminal of the switching unit is connected to the driving unit. The switching unit is also connected to the battery, the boost circuit, and the power supply circuit. The driving unit is configured to output a driving signal when it receives a first-level signal and to stop operating when it receives a second-level signal. The switching unit is configured to control the connection between the boost circuit and the power supply circuit when it receives the driving signal and to control the connection between the power supply circuit and the battery when the driving unit stops operating.

[0009] In some embodiments, the driving unit includes a switch Q5 and a resistor R5. A first terminal of the resistor R5 is connected to the control module, a second terminal of the resistor R5 is connected to the control terminal of the switch Q5, a first terminal of the switch Q5 is connected to the switching unit, and a second terminal of the switch Q5 is grounded.

[0010] In some embodiments, the switching unit includes a relay RLY1. The first coil input terminal of the relay RLY1 is connected to a power supply, the second coil input terminal of the relay RLY1 is connected to the drive unit, the common contact of the relay RLY1 is connected to the power supply circuit, the normally closed contact of the relay RLY1 is connected to the battery, and the normally open contact of the relay RLY1 is connected to the boost circuit.

[0011] In some embodiments, the sampling module includes a resistor R1 and a sampling resistor R2. A first terminal of the resistor R1 is connected to the battery, a second terminal of the resistor R1 is connected to both the first terminal of the sampling resistor R2 and the control module, and the second terminal of the sampling resistor R2 is grounded.

[0012] In some embodiments, the power supply control circuit further includes a pull-up module. A first terminal of the pull-up module is connected to a power supply, and a second terminal of the pull-up module is connected to both the control module and the switching module. The pull-up module provides a pull-up voltage to both the control module and the switching module.

[0013] In some embodiments, the pull-up module includes a resistor R4. A first terminal of the resistor R4 is connected to the power supply, and a second terminal of the resistor R4 is connected to both the control module and the switching module.

[0014] Secondly, embodiments of this application provide an energy storage power supply, which includes the power supply control circuit described above.

[0015] Unlike existing technologies, this application provides a power supply control circuit and an energy storage power source. The power supply control circuit is connected to a battery, a boost circuit, and a power supply circuit. Specifically, the power supply control circuit includes a sampling module, a control module, a drive module, and a switching module. In the power supply control circuit, firstly, the sampling module is connected to the battery to sample the battery voltage in real time. Next, the control module compares the sampled voltage with a reference voltage. If the sampled voltage is less than the reference voltage, it outputs a first-level signal; if the sampled voltage is greater than the reference voltage, it outputs a second-level signal. Then, the switching module receives the signal output by the control module. Upon receiving the first-level signal, it controls the connection between the boost circuit and the power supply circuit, allowing the boosted voltage to power the load through the power supply circuit. Upon receiving the first-level signal again, it controls the connection between the power supply circuit and the battery, allowing the battery to directly power the load through the power supply circuit. The power supply control circuit and energy storage power source provided in this application can automatically switch the power supply mode according to the battery voltage. When the battery voltage is insufficient, it uses the boost circuit to provide power; when the battery voltage is sufficient, it directly provides power without using the boost circuit, thus meeting the load's different voltage requirements. Therefore, by selecting a more suitable power supply path under different battery voltage conditions, the overall efficiency of the power supply system is improved and energy consumption is reduced. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0017] Figure 1 This is a structural block diagram of a power supply control circuit provided in an embodiment of this application;

[0018] Figure 2 This is a detailed circuit structure diagram of the power supply control circuit provided in the embodiments of this application;

[0019] Figure 3 This is a schematic diagram of the circuit structure of the power supply control circuit, boost circuit, and power supply circuit provided in the embodiments of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0021] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0022] When an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intervening elements.

[0023] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0024] Please see Figure 1 , Figure 1 This is a structural block diagram of a power supply control circuit 100 provided in an embodiment of this application.

[0025] This application provides a power supply control circuit 100, which is connected to a battery 200, a boost circuit 300, and a power supply circuit 400. The power supply control circuit 100 includes a sampling module 10, a control module 20, and a switching module 30. The sampling module 10 is connected to the battery 200, the control module 20 is connected to both the sampling module 10 and the switching module 30, and the switching module 30 is also connected to the battery 200, the boost circuit 300, and the power supply circuit 400.

[0026] Specifically, the sampling module 10 samples the battery voltage of the battery 200 to obtain a sampled voltage. The control module 20 outputs a first-level signal when the sampled voltage is less than a reference voltage, and outputs a second-level signal when the sampled voltage is greater than the reference voltage. The switching module 30 controls the connection between the boost circuit 300 and the power supply circuit 400 when it receives the first-level signal; and controls the connection between the power supply circuit 400 and the battery 200 when it receives the second-level signal.

[0027] The sampling voltage is the voltage value obtained by sampling module 10 after sampling the battery voltage of battery 200.

[0028] The reference voltage is a pre-set fixed voltage value used as a benchmark for determining the battery voltage state. In this power supply control circuit, the reference voltage is compared with the sampled voltage to determine the battery voltage condition. If the sampled voltage is lower than the reference voltage, the battery voltage is low; if the sampled voltage is higher than the reference voltage, the battery voltage is high. The reference voltage is typically determined based on the battery characteristics, the requirements of the power supply circuit, and the overall system design.

[0029] The first level signal is the signal output by the control module 20 when the sampled voltage is lower than the reference voltage. A level signal is a digital signal, typically represented by high and low levels to indicate different states. Here, the first level signal can be seen as a signal representing a low battery voltage state, which triggers the switching module 30 to perform corresponding operations, such as controlling the connection between the boost circuit 300 and the power supply circuit 400 to increase the voltage and supply power to the load. Whether the first level signal is specifically high or low depends on the circuit design and conventions.

[0030] The second level signal is output by the control module 20 when the sampled voltage is greater than the reference voltage. Unlike the first level signal, it represents a higher battery voltage state and will also trigger the switching module 30 to perform a different operation: the power supply circuit 400 is directly connected to the battery 200, eliminating the need for voltage boosting, and the battery can directly power the load. If the first level signal is high, the second level signal is usually low, and vice versa.

[0031] In practical applications, the sampling module 10 continuously samples the battery voltage of the battery 200 and converts it into a sampled voltage. The control module 20 compares the sampled voltage obtained by the sampling module 10 with a preset reference voltage. When the battery power gradually depletes, causing the sampled voltage to be lower than the reference voltage, it indicates that the battery voltage is low and may not be able to directly provide a suitable voltage to the power supply circuit 400. At this time, the control module 20 outputs a first-level signal. If the battery is fully charged or has sufficient power, causing the sampled voltage to be higher than the reference voltage, it indicates that the battery voltage is high and can directly supply power to the power supply circuit 400. At this time, the control module 20 outputs a second-level signal. When the switching module 30 receives the first-level signal, it controls the boost circuit 300 to connect to the power supply circuit 400. In this way, the voltage output by the battery 200 is first boosted by the boost circuit 300 to a suitable voltage value required by the power supply circuit 400 before supplying power to the power supply circuit 400, ensuring that the power supply circuit can work normally. If the switching module 30 receives the second level signal, it will control the power supply circuit 400 to be directly connected to the battery 200. At this time, the battery 200 can directly provide power to the power supply circuit 400 without the need for boosting, which reduces the loss in the energy conversion process and improves the power supply efficiency.

[0032] Please see Figure 2 , Figure 2 This is a detailed circuit structure diagram of the power supply control circuit 100 provided in the embodiments of this application.

[0033] In some embodiments, the sampling module 10 includes a resistor R1 and a sampling resistor R2. The first terminal of resistor R1 is connected to the battery 200 (…). Figure 2 Not shown, the connection point with battery 200 is BAT+), the second end of resistor R1 is connected to the first end of sampling resistor R2 and control module 20 respectively, and the second end of sampling resistor R2 is grounded.

[0034] In practical applications, the sampling module 10 collects the battery voltage (i.e., the voltage at point BAT+) in real time. Resistor R1 and sampling resistor R2 divide the battery voltage, and the voltage divided by sampling resistor R2 is the sampling voltage.

[0035] The ratio of the sampling voltage to the battery voltage can be adjusted by changing the resistance values ​​of resistors R1 and R2, so that the sampling voltage meets the operating voltage requirements of subsequent components.

[0036] In some embodiments, the control module 20 includes a comparator U1A. The non-inverting input of the comparator U1A is connected to a reference voltage, the inverting input of the comparator U1A is connected to the sampling module 10, and the output of the comparator U1A is connected to the switching module 30.

[0037] Specifically, by adjusting the reference voltage, the battery voltage can be made equal to a preset voltage value (e.g., 28V) when the sampled voltage (which is positively correlated with the battery voltage) equals the reference voltage.

[0038] In practical applications, when the voltage at the inverting input terminal of comparator U1A (i.e., the sampling voltage) is less than the voltage at its non-inverting input terminal (i.e., the reference voltage), it indicates that the battery voltage is less than a preset voltage threshold (e.g., 28V). The battery voltage needs to be boosted by the boost circuit 300 before it can be input to the power supply circuit 400. At this time, the output terminal of comparator U1A will output a high-level signal (i.e., the first-level signal) to enable the switching module 30 to control the connection between the boost circuit 300 and the power supply circuit 400.

[0039] When the voltage at the inverting input of comparator U1A (i.e., the sampling voltage) is greater than the voltage at its non-inverting input (i.e., the reference voltage), it indicates that the battery voltage is greater than a preset voltage threshold (e.g., 28V), and the battery voltage is sufficient to be directly input to the power supply circuit 400. At this time, the output of comparator U1A will output a low-level signal (i.e., a second-level signal) to enable the switching module 30 to control the connection between the battery 200 and the power supply circuit 400.

[0040] In some embodiments, the control module 20 further includes a switch Q6, a resistor R3, and a resistor R6. The first end of resistor R6 is connected to the output of comparator U1A, the second end of resistor R6 is connected to the control terminal of switch Q6, the first end of resistor R3 is connected to both the inverting input of comparator U1A and the sampling module 10, the second end of resistor R3 is connected to the first end of switch Q6, and the second end of switch Q6 is grounded.

[0041] In practical applications, the switching transistor Q6, resistor R3, and resistor R4 form the hysteresis circuit of comparator U1A. When the voltage at the inverting input of comparator U1A (i.e., the sampling voltage) is less than the voltage at its non-inverting input (i.e., the reference voltage), it indicates that the battery voltage is less than a preset voltage threshold (e.g., 28V). Comparator U1A outputs a high-level signal (i.e., the first level signal) to allow the switching module 30 to control the connection between the boost circuit 300 and the power supply circuit 400. At this time, the control terminal of the switching transistor Q6 is also turned on, and resistor R3 is connected in parallel with the sampling resistor R2, thus reducing the voltage across the sampling resistor R2 (i.e., the sampling voltage). When the battery voltage rises back to the preset voltage threshold (e.g., 28V), the sampling voltage is still less than the reference voltage, and comparator U1A still outputs a high-level signal (i.e., the first level signal). Only when the battery voltage rises to a level that makes the sampling voltage greater than the reference voltage (at which point the battery voltage is greater than the preset voltage threshold) will comparator U1A output a low-level signal (i.e., the second level signal). This reduces the likelihood of frequently switching circuit connection modes when the battery voltage fluctuates around a preset voltage threshold.

[0042] In this embodiment, taking the switch Q6 as an NPN transistor as an example, the base of the NPN transistor is the control terminal of the switch Q6, the collector of the NPN transistor is the first terminal of the switch Q6, and the emitter of the NPN transistor is the second terminal of the switch Q6.

[0043] In addition, the switching transistor Q6 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.

[0044] In some embodiments, the switching module 30 includes a drive unit 31 and a switching unit 32. The control terminal of the drive unit 31 is connected to the control module 20, the control terminal of the switching unit 32 is connected to the drive unit 31, and the switching unit 32 is also connected to the battery 200, the boost circuit 300, and the power supply circuit 400.

[0045] Specifically, the drive unit 31 is used to output a drive signal when it receives a first level signal and to stop working when it receives a second level signal. The switching unit 32 is used to control the connection between the boost circuit 300 and the power supply circuit 400 when it receives a drive signal and to control the connection between the power supply circuit 400 and the battery 200 when the drive unit 31 stops working.

[0046] The drive signal is generated and output by the drive unit 31 upon receiving the first-level signal from the control module 20. This signal causes the switching unit 32 to perform a corresponding operation, namely, controlling the connection between the boost circuit 300 and the power supply circuit 400, thereby realizing the function of boosting the voltage of the battery 200 before supplying power to the power supply circuit 400. The drive signal can take various forms, commonly including voltage or current signals. For example, it may be a voltage signal with a specific voltage amplitude and waveform, used to control the on and off states of the switching elements (such as transistors, relays, etc.) in the switching unit 32.

[0047] In some embodiments, the driving unit 31 includes a switching transistor Q5 and a resistor R5. The first end of the resistor R5 is connected to the control module 20, the second end of the resistor R5 is connected to the control terminal of the switching transistor Q5, the first end of the switching transistor Q5 is connected to the switching unit 32, and the second end of the switching transistor Q5 is grounded.

[0048] In some embodiments, the switching unit 32 includes a relay RLY1. The first coil input terminal of the relay RLY1 is connected to a power supply (e.g., a +12V DC power supply), the second coil input terminal of the relay RLY1 is connected to the drive unit 31, and the common contact of the relay RLY1 is connected to the power supply circuit 400 (connection point is...). Figure 2 Connect to point A), the normally closed contact of relay RLY1 is connected to battery 200 (connection point is...). Figure 2 The normally open contact of relay RLY1 is connected to the boost circuit 300 (connection point is...). Figure 2 (LVBUS point) connection.

[0049] In practical applications, when the control terminal of switch Q5 receives a first-level signal (i.e., a high-level signal), the first terminal of switch Q5 conducts with its second terminal, and switch Q5 outputs a drive signal (a low-level signal). At this time, the coil of relay RLY1 is energized, thus connecting the normally open contact of relay RLY1 with the common contact, that is, connecting boost circuit 300 with power supply circuit 400. In this way, the voltage output from battery 200 is first boosted by boost circuit 300 to a suitable voltage value required by power supply circuit 400, and then supplies power to power supply circuit 400, ensuring that power supply circuit can operate normally.

[0050] When the control terminal of switch Q5 receives the second level signal (i.e., a low level signal), switch Q5 does not operate, and its first and second terminals are not connected. At this time, the coil of relay RLY1 is not energized, and the normally closed contact of relay RLY1 connects to the common contact, meaning battery 200 is connected to power supply circuit 400. In this situation, battery 200 can directly provide power to power supply circuit 400 without voltage boosting, reducing energy loss during conversion and improving power supply efficiency.

[0051] In this embodiment, taking the switch Q5 as an NPN transistor as an example, the base of the NPN transistor is the control terminal of the switch Q5, the collector of the NPN transistor is the first terminal of the switch Q5, and the emitter of the NPN transistor is the second terminal of the switch Q5.

[0052] In addition, the switching transistor Q5 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.

[0053] In some embodiments, the power supply control circuit 100 further includes a pull-up module 40. A first terminal of the pull-up module 40 is connected to a power supply (e.g., a +12V DC power supply), and a second terminal of the pull-up module 40 is connected to both the control module 20 and the switching module 30. Specifically, the pull-up module 40 provides pull-up voltages to both the control module 20 and the switching module 30.

[0054] In some embodiments, the pull-up module 40 includes a resistor R4. The first end of the resistor R4 is connected to a power supply, and the second end of the resistor R4 is connected to both the control module 20 and the switching module 30.

[0055] Specifically, the power supply (e.g., +12V power supply) provides pull-up voltage to switching transistors Q5 and Q6 through resistor R4 to ensure that switching transistors Q5 and Q6 can conduct when comparator U1A outputs a high-level signal (i.e., the first level signal).

[0056] Please see Figure 3 , Figure 3 This is a schematic diagram of the circuit structure of the power supply control circuit 100, the boost circuit 300, and the power supply circuit 400 provided in the embodiments of this application.

[0057] Battery 200 ( Figure 3 The positive terminal (not shown) is connected to Figure 3 The BAT+ point, the negative terminal of battery 200 is connected to Figure 3 The GND_BAT point.

[0058] Figure 3 The circuit structure of the boost circuit 300 is illustrated exemplarily. The boost circuit 300 is used to boost the battery voltage output by the battery 200, but is not limited to... Figure 3 The structure within can be set according to the actual situation. For example... Figure 3 As shown, the boost circuit 300 includes inductor LD1, switching transistor Q1, switching transistor Q2, capacitor C1, and capacitor C2.

[0059] Figure 3 The circuit structure of a power supply circuit 400 is illustrated exemplarily. The power supply circuit 400 processes the voltage output from the boost circuit 300 or the battery voltage to power a subsequent load. The power supply circuit 400 is not limited to... Figure 3 The structure within can be set according to the actual situation. For example... Figure 3 As shown, the power supply circuit 400 includes inductor LD2, switching transistor Q3, switching transistor Q4, capacitor C3, and capacitor C4.

[0060] Among them, the load that can be connected to the power supply circuit 400 ( Figure 3 Not shown, connection point is Figure 3 The operating voltage and battery voltage of U2_BUS are used to adjust the operating states of switching transistors Q3 and Q4 in the power supply circuit 400.

[0061] For example, if the load is a device panel, and the device panel requires an operating voltage range of 28–32V, then when the battery voltage is within the 28–32V range, switch Q3 can be controlled to be normally open and switch Q4 to be normally closed, allowing the battery voltage to directly supply power to the device panel. When the battery voltage is greater than 32V, switch Q3 and switch Q4 can be controlled to alternately switch, stepping down the battery voltage to supply power to the device panel.

[0062] In summary, this power supply control circuit 100 monitors the battery voltage in real time through a sampling module. The control module makes judgments based on the voltage status and outputs corresponding signals. The switching module switches the power supply mode according to the signals, realizing the function of intelligently selecting the power supply mode based on the battery level. This ensures the normal operation of the power supply circuit and improves energy utilization efficiency. Simultaneously, the comparator and hysteresis circuit in the control module work together to reduce the possibility of frequent switching caused by battery voltage fluctuations, thus improving circuit stability.

[0063] This application provides an energy storage power supply, which includes the power supply control circuit 100 as described above.

[0064] The specific structure and working principle of the power supply control circuit 100 can be referred to the above embodiments, and will not be repeated here.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A power supply control circuit, characterized by comprising: The power supply control circuit is connected with a battery, a boost circuit and a power supply circuit; The power supply control circuit comprises a sampling module, a control module and a switching module; The sampling module is connected with the battery, the control module is connected with the sampling module and the switching module respectively, and the switching module is further connected with the battery, the boost circuit and the power supply circuit respectively; The sampling module is configured to sample a battery voltage to obtain a sampling voltage; The control module is configured to output a first level signal when the sampling voltage is less than a reference voltage, and output a second level signal when the sampling voltage is greater than the reference voltage; The switching module is configured to control connection of the boost circuit and the power supply circuit when the first level signal is received, and control connection of the power supply circuit and the battery when the second level signal is received.

2. The power supply control circuit of claim 1, wherein, The control module comprises a comparator U1A; A non-inverting input terminal of the comparator U1A is connected with the reference voltage, an inverting input terminal of the comparator U1A is connected with the sampling module, and an output terminal of the comparator U1A is connected with the switching module.

3. The power supply control circuit of claim 2, wherein, The control module further comprises a switch Q6, a resistor R3 and a resistor R6; A first terminal of the resistor R6 is connected with the output terminal of the comparator U1A, a second terminal of the resistor R6 is connected with a control terminal of the switch Q6, a first terminal of the resistor R3 is connected with the inverting input terminal of the comparator U1A and the sampling module respectively, a second terminal of the resistor R3 is connected with a first terminal of the switch Q6, and a second terminal of the switch Q6 is grounded.

4. The power supply control circuit of claim 1, wherein, The switching module comprises a driving unit and a switching unit; A control terminal of the driving unit is connected with the control module, a control terminal of the switching unit is connected with the driving unit, and the switching unit is further connected with the battery, the boost circuit and the power supply circuit respectively; The driving unit is configured to output a driving signal when the first level signal is received; The driving unit stops working when the second level signal is received; The switching unit is configured to control connection of the boost circuit and the power supply circuit when the driving signal is received, and control connection of the power supply circuit and the battery when the driving unit stops working.

5. The power supply control circuit of claim 4, wherein, The driving unit comprises a switch Q5 and a resistor R5; A first terminal of the resistor R5 is connected with the control module, a second terminal of the resistor R5 is connected with a control terminal of the switch Q5, a first terminal of the switch Q5 is connected with the switching unit, and a second terminal of the switch Q5 is grounded.

6. The power supply control circuit of claim 4, wherein, The switching unit comprises a relay RLY1; A first coil input terminal of the relay RLY1 is connected with a power supply, a second coil input terminal of the relay RLY1 is connected with the driving unit, a common contact of the relay RLY1 is connected with the power supply circuit, a normally closed contact of the relay RLY1 is connected with the battery, and a normally open contact of the relay RLY1 is connected with the boost circuit.

7. The power supply control circuit of claim 1, wherein, The sampling module comprises a resistor R1 and a sampling resistor R2; A first end of the resistor R1 is connected with the battery, a second end of the resistor R1 is connected with a first end of the sampling resistor R2 and the control module respectively, and a second end of the sampling resistor R2 is grounded.

8. The power supply control circuit of claim 1, wherein, The power supply control circuit further comprises a pull-up module; A first end of the pull-up module is connected with the power supply, and a second end of the pull-up module is connected with the control module and the switching module respectively; The pull-up module is used for providing pull-up voltage for the control module and the switching module.

9. The power supply control circuit of claim 8, wherein, The pull-up module comprises a resistor R4. A first end of the resistor R4 is connected with the power supply, and a second end of the resistor R4 is connected with the control module and the switching module respectively.

10. An energy storage power supply, characterized by, The energy storage power supply comprises the power supply control circuit according to any one of claims 1 to 9.

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