Power supply system applied to electric equipment

Abstract

The utility model provides a power supply system applied to electric equipment, the power supply system is arranged outside the electric equipment, and the power supply system comprises a secondary battery, a first detection module and a control module. Wherein the secondary battery is configured to be capable of outputting electric energy to electric equipment. The first detection module is electrically connected with the output end of the secondary battery and is configured to be capable of detecting the output voltage of the secondary battery. The control module comprises an input port and an output port, and the input port is electrically connected with an external power supply. The output port is electrically connected to the secondary battery and is configured to be capable of charging the secondary battery. The control module is electrically connected with the first detection module and is configured to change the voltage of the output port for charging the secondary battery according to the voltage of the secondary battery. According to the embodiment of the utility model, the charging efficiency can be improved, the cost can be reduced, the internal structure and miniaturization of electric equipment can be simplified, the stability can be improved, and the service life of the secondary battery can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment technology, and in particular to a power supply system for electrical equipment. Background Technology

[0002] With the development and advancement of technology, the number of electrical devices in homes, businesses, and industrial production is increasing. To prevent electrical devices from malfunctioning due to power outages, which could affect user experience or create safety hazards, some electrical devices have additional backup power supplies. For example, smart doors and windows in smart homes, and electrically driven fire alarms or extinguishing devices need to maintain basic functionality even during power outages, so backup power supplies are usually installed.

[0003] However, integrating backup power supplies into electrical equipment is not only complex in design and manufacturing processes and relatively expensive, but it also hinders the miniaturization of electrical equipment and does not meet user needs. Moreover, for products such as doors, windows, and curtains that are used in scenarios with strong thrust, shock-absorbing structures are required for backup power supplies to prevent leakage and fire hazards caused by large vibrations.

[0004] If a small backup power supply is used, it can only support the operation of electrical equipment for a short period of time. Taking a smart door as an example, when the mains power fails and the backup power supply provides power, if the user does not open the smart door for a long time, such as when the user is away on a business trip, the power in the backup power supply may be depleted, so that the user cannot open the smart door, which will affect the user experience.

[0005] Furthermore, electrical equipment is normally powered by mains electricity, and backup power supplies are used infrequently. Traditional methods of charging backup power supplies mainly involve removing them from the power source for charging or keeping them in a charging state for extended periods. Removing the backup power supply for charging is inconvenient, and due to natural self-discharge losses, prolonged periods without charging may deplete its power. Continuously charging the backup power supply for extended periods keeps it at full charge, severely impacting its lifespan.

[0006] The content of the background section is merely the technology known to the inventor and does not necessarily represent the prior art in this field. Utility Model Content

[0007] To address one or more deficiencies in the prior art, this utility model provides a power supply system for electrical equipment, wherein the power supply system is disposed outside the electrical equipment, and the power supply system includes:

[0008] A secondary battery, configured to output electrical energy to the electrical device;

[0009] A first detection module, electrically connected to the output terminal of the secondary battery, and configured to detect the output voltage of the secondary battery; and

[0010] The control module includes:

[0011] The input port is electrically connected to an external power supply.

[0012] An output port is electrically connected to the secondary battery and configured to charge the secondary battery.

[0013] The control module is electrically connected to the first detection module and is configured to change the voltage at which the output port charges the secondary battery according to the voltage of the secondary battery.

[0014] According to one aspect of the present invention, the power supply system further includes:

[0015] The second detection module is electrically connected to the input port and is configured to detect the voltage of the input port. The control module is configured to obtain the voltage of the input port by the second detection module and change the voltage of the output port to charge the secondary battery according to the voltage of the input port.

[0016] According to one aspect of the present invention, the control module has multiple output modes for charging the secondary battery, and the control module further includes:

[0017] An adjustment unit is electrically connected to the first detection module and the second detection module. The adjustment unit is configured to switch the output mode based on the output voltage of the secondary battery obtained by the first detection module and the voltage of the input port obtained by the second detection module.

[0018] According to one aspect of the present invention, the output mode includes:

[0019] The secondary battery is charged with a first voltage;

[0020] The secondary battery is charged with a second voltage; and

[0021] Stop charging the secondary battery;

[0022] The value of the second voltage is an integer multiple of the value of the first voltage.

[0023] According to one aspect of the present invention, the adjusting unit includes:

[0024] A first adjustment circuit, which is electrically connected to the first detection module; and

[0025] A first adjustment port is electrically connected to the first adjustment circuit.

[0026] When the output voltage of the secondary battery is higher than the first preset value, the first adjustment circuit is connected and grounded; when the output voltage of the secondary battery is not higher than the first preset value, the first adjustment circuit is disconnected.

[0027] When the first adjustment circuit is connected and grounded, the first adjustment port is grounded, and the control module switches to the output mode of stopping charging the secondary battery.

[0028] When the first adjustment circuit is disconnected, the control module switches to the output mode of charging the secondary battery with the second voltage.

[0029] According to one aspect of the present invention, the adjusting unit further includes:

[0030] The second adjustment circuit is electrically connected to the second detection module.

[0031] The second adjustment port is floating; and

[0032] A switch configured to be controllable by the second regulating circuit to switch between the first regulating port and the second regulating port;

[0033] The second regulating circuit is connected or disconnected according to the voltage of the input port; when the second regulating circuit is connected, the switch and the second regulating port are connected, and the control module switches to the output mode of charging the secondary battery with the first voltage.

[0034] When the second adjustment circuit is disconnected, the switch is connected to the first adjustment port.

[0035] According to one aspect of the present invention, the control module further includes:

[0036] The microcontroller unit is used to connect the first adjustment circuit to the first detection module; the second adjustment circuit is also connected to the second detection module via the microcontroller unit.

[0037] According to one aspect of the present invention, the first regulating circuit and the second regulating circuit include field-effect transistors.

[0038] According to one aspect of the present invention, the power supply system further includes:

[0039] The circuit conversion module is configured to output DC power to the control module. The input port is electrically connected to the external power supply through the circuit conversion module.

[0040] According to one aspect of the present invention, the circuit conversion module includes a switchable voltage management unit and is configured to switch the voltage management unit to output different voltage DC power to the control module.

[0041] According to one aspect of the present invention, the power supply system further includes:

[0042] A power supply module is electrically connected to the circuit conversion module and the secondary battery, and is configured to supply power to the electrical equipment, wherein the output voltage of the circuit conversion module is greater than the output voltage of the secondary battery when there is no load.

[0043] According to one aspect of the present invention, the power supply module includes:

[0044] A power supply port is electrically connected to the power-consuming equipment, and the circuit conversion module is electrically connected to the power supply port; and

[0045] A power supply compensation unit is provided, through which the secondary battery is connected to the power supply port, and the power supply compensation unit is configured to supply power to the electrical device when the output voltage of the circuit conversion module is lower than the output voltage of the secondary battery.

[0046] According to one aspect of the present invention, the power supply compensation unit includes:

[0047] Power supply field-effect transistor;

[0048] A body diode, wherein the body diode is connected between the drain (D) and source (S) terminals of the power supply field-effect transistor;

[0049] When the output voltage of the circuit conversion module is lower than the output voltage of the secondary battery, and the output voltage of the circuit conversion module is not zero, the circuit conversion module and the secondary battery jointly supply power to the electrical device. The secondary battery is electrically connected to the power supply port through the body diode to pull the voltage of the power supply port up to the output voltage of the secondary battery.

[0050] When the output voltage of the circuit conversion module is 0, the power supply field-effect transistor is connected, and the secondary battery is connected to the power supply port through the power supply field-effect transistor to supply power to the electrical equipment.

[0051] According to one aspect of the present invention, the power supply module further includes:

[0052] An anti-reverse current transistor is provided, and the circuit conversion module is connected to the power supply port after passing through the anti-reverse current transistor. The anti-reverse current transistor is configured to block the secondary battery from supplying power to the circuit conversion module.

[0053] According to one aspect of the present invention, the adjustment unit is detachably disposed in a fixed position to match the voltage of the input port; the secondary battery is detachably disposed in a fixed position.

[0054] According to one aspect of the present invention, the power supply system further includes:

[0055] A current setting module is electrically connected to the control module and configured to adjust the current supplied by the output port to charge the secondary battery.

[0056] According to one aspect of the present invention, the control module is configured to charge the secondary battery in a continuous charging and / or trickle charging manner; the current setting module includes:

[0057] A charging current-limiting resistor, configured to change the current flowing from the output port to the secondary battery by altering its resistance value; and / or

[0058] A trickle-limiting resistor is configured to change the magnitude of the trickle current from the output port to the secondary battery by changing the resistance value of the trickle-limiting resistor.

[0059] According to one aspect of the present invention, the power supply system further includes:

[0060] An overheat protection circuit is provided between the control module and the secondary battery, and is configured to disconnect the electrical connection between the control module and the secondary battery when the temperature of the secondary battery exceeds a first threshold.

[0061] According to one aspect of the present invention, the power supply system further includes:

[0062] A charging indicator module is electrically connected to the control module and configured to output different indicator signals according to the output mode of the control module.

[0063] According to one aspect of the present invention, the power supply system is disposed in a junction box, and the external power source is AC mains power.

[0064] According to one aspect of the present invention, the electrical equipment and the junction box are detachably connected, and the power supply system is electrically connected to the electrical equipment via an electrical connector.

[0065] According to one aspect of the present invention, the present invention also includes a method for supplying power to an electrical device, using the power supply system described above, the power supply method comprising:

[0066] Control the electrical connection between the electrical equipment and the power supply system;

[0067] Detect the output voltage of the power supply system;

[0068] Determine whether the output voltage of the power supply system is lower than the second threshold.

[0069] When the output voltage of the power supply system is lower than the second threshold, the operating power of the electrical equipment is reduced.

[0070] According to one aspect of the present invention, the power supply system includes a circuit conversion module, wherein the second threshold is not higher than the output voltage of the circuit conversion module.

[0071] According to one aspect of the present invention, the power supply method further includes:

[0072] Determine whether the duration for which the output voltage of the power supply system is lower than the second threshold is greater than the third threshold;

[0073] If the duration of the power supply system's output voltage being lower than the second threshold is greater than the third threshold, the operating power of the electrical equipment will be reduced.

[0074] Compared with existing technologies, the embodiments of this utility model provide a power supply system for electrical equipment. The power supply system is located outside the electrical equipment, eliminating the need to occupy internal space, thus greatly increasing design freedom, reducing restrictions on the size of the secondary battery, improving charging efficiency, and lowering costs. It also facilitates the simplification and miniaturization of the internal structure of the electrical equipment and improves the stability of the secondary battery. Furthermore, by using a control module to charge the secondary battery according to its voltage, it avoids the secondary battery being depleted or remaining fully charged for extended periods, thereby extending the battery's lifespan.

[0075] This utility model also includes an embodiment of a power supply method for electrical equipment, which applies the aforementioned power supply system and can adjust the operating power of the electrical equipment according to the power supply situation, thereby extending the usage time of the electrical equipment when powered by a secondary battery. Attached Figure Description

[0076] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0077] Figure 1 This is a structural block diagram of the power supply system in some embodiments of this utility model;

[0078] Figure 2 This is a structural block diagram of a power supply system including a second detection module in some embodiments of this utility model;

[0079] Figure 3 This is a structural block diagram of the adjustment unit in some embodiments of this utility model;

[0080] Figure 4 This is a circuit diagram of the adjustment unit in some embodiments of this utility model;

[0081] Figure 5A This is a circuit diagram of the first detection module in some embodiments of this utility model;

[0082] Figure 5B This is a circuit diagram of the second detection module in some embodiments of this utility model;

[0083] Figure 5C This is a wiring diagram of the microcontroller unit in some embodiments of this utility model;

[0084] Figure 6 This is a circuit diagram of the circuit conversion module in some embodiments of this utility model;

[0085] Figure 7 This is a structural block diagram of a power supply system including a power supply module in some embodiments of this utility model;

[0086] Figure 8 This is a circuit diagram of the power supply module in some embodiments of this utility model;

[0087] Figure 9 This is a structural block diagram of a power supply system including a current setting module, an overheat protection circuit, and a charging indicator module in some embodiments of this utility model;

[0088] Figure 10 This is a circuit diagram of the power supply system in some embodiments of this utility model;

[0089] Figure 11 This is an exploded view of the junction box in some embodiments of this utility model;

[0090] Figure 12 This is a flowchart illustrating the power supply method for electrical equipment in some embodiments of this utility model;

[0091] Figure 13 This is a flowchart illustrating a power supply method, including the step of determining the duration for which the output voltage of the power supply system is lower than a second threshold, in some embodiments of this utility model. Detailed Implementation

[0092] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0093] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0094] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0095] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0096] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0097] The embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0098] Figure 1 The following is a structural block diagram of a power supply system 10 applied to electrical equipment 20 in some embodiments of the present invention. Figure 1 The power supply system 10 is described below.

[0099] In this embodiment, the power supply system 10 is located outside the electrical equipment 20, such as... Figure 1 As shown, the power supply system 10 includes a secondary battery 11, a first detection module 12, and a control module 13.

[0100] The secondary battery 11 is configured to output electrical energy to the power-consuming device 20. The secondary battery 11 represents a battery capable of being recharged twice. It can be a standard product in the field of view, or its structure can be specifically designed according to the installation location and usage of the power supply system 10 in this embodiment. In some embodiments of this invention, multiple secondary batteries 11 may be included, for example, connected in series to provide a higher voltage to the power-consuming device 20. According to a preferred embodiment of this invention, the secondary battery 11 is detachably mounted in a fixed position, allowing it to be removed from the power supply system 10 for easy replacement.

[0101] The first detection module 12 is electrically connected to the output terminal of the secondary battery 11, and the first detection module 12 is capable of detecting the output voltage of the secondary battery 11. Specifically, the first detection module 12 may include a voltage detection circuit, the circuit design of which will be described in subsequent embodiments.

[0102] The control module 13 includes an input port 131 and an output port 132, wherein the input port 131 is electrically connected to the external power supply 30. Specifically, the input port 131 can be directly connected to the mains power, or it can be connected to the mains power through functional components such as current limiters, voltage regulators, and transformers to achieve different functions. For example, it can reduce the voltage input to the power supply system 10 to a low voltage level to improve user safety. For instance, when a user disassembles or replaces electrical equipment, the operating range is a low voltage environment, reducing the risk of electric shock.

[0103] Output port 132 is electrically connected to secondary battery 11 and can charge secondary battery 11. For example, when the secondary battery 11 is low on power and the voltage drops, it can be charged through output port 132 to keep the power of secondary battery 11 within a certain range and avoid affecting the normal use of electrical equipment 20.

[0104] In this embodiment, the control module 13 is also electrically connected to the first detection module 12, and the control module 13 can also change the charging voltage of the secondary battery 11 through the output port 132 according to the voltage of the secondary battery 11 detected by the first detection module 12. For example, the first detection module 12 outputs different currents or voltages according to the changes in the output voltage of the secondary battery 11. The control module 13 may include circuits or control chips that implement control functions, and can change the output voltage of the output port 132 according to the output of the first detection module 12.

[0105] In practical applications, as the secondary battery 11 discharges, its output voltage gradually decreases. The first detection module 12 detects the change in the output voltage of the secondary battery 11, reflecting its remaining charge. In this embodiment, the control module 13 controls the charging voltage of the secondary battery 11 based on its output voltage, preventing the secondary battery 11 from becoming too low and unable to supply power to the electrical device 20, or from being charged for an extended period, thus maintaining a fully charged state and affecting its lifespan.

[0106] Meanwhile, in this embodiment, the power supply system 10 is located outside the electrical device 20, and is not limited by the structure of the electrical device 20, allowing for greater design freedom. It can provide a larger capacity secondary battery 11, extending the usage time of the electrical device 20 in the event of a mains power outage. Furthermore, it helps to simplify the structure of the electrical device 20 and improve the user experience.

[0107] Figure 2A structural block diagram of a power supply system 10 according to a preferred embodiment of the present invention is shown. In this embodiment, the power supply system 10 includes a second detection module 14, which is electrically connected to an input port 131 and is capable of detecting the voltage at the input port 131. A control module 13 is electrically connected to the second detection module 14. The control module 13 can obtain the voltage at the input port 131 from the second detection module 14, and is configured to change the voltage at the output port 132 that charges the secondary battery 11 based on the voltage at the input port 131.

[0108] The voltage change at input port 131 includes the case of power failure of external power supply 30. In some embodiments of this utility model, the voltage change at input port 131 also includes the case where the user or installer adjusts the voltage input from external power supply 30 to power supply system 10 according to usage needs. For example, when multiple secondary batteries 11 are connected in series, the voltage of secondary battery 11 increases, and the voltage at output port 132 charging secondary battery 11 also needs to increase accordingly. In this embodiment, the voltage at input port 131 can be adjusted, and the voltage at output port 132 charging secondary battery 11 can be changed using control module 13. The specific circuit design and adjustment method will be described in subsequent embodiments.

[0109] This embodiment can expand the applicability of the power supply system 10 and provide extended functions for the power supply system 10. It can charge secondary batteries 11 of different numbers or different output voltages, and is suitable for different electrical devices 20. It can be adjusted according to actual usage needs.

[0110] like Figure 3 As shown, according to a preferred embodiment of the present invention, the control module 13 further includes an adjustment unit 133. In this embodiment, the control module 13 has multiple output modes for charging the secondary battery 11, wherein the output modes are preset, for example, the voltage for charging the secondary battery 11 corresponding to each output mode is preset.

[0111] The adjustment unit 133 is electrically connected to the first detection module 12 and the second detection module 13. The adjustment unit 133 can switch different output modes according to the output voltage of the secondary battery 11 obtained by the first detection module 12 and the voltage of the input port 131 obtained by the second detection module 14, so as to adapt to different application scenarios and meet the charging needs of the secondary battery 11 under different conditions.

[0112] Specifically, according to a preferred embodiment of the present invention, the output modes preset by the control module 13 include charging the secondary battery 11 with a first voltage, charging the secondary battery 11 with a second voltage, and stopping charging the secondary battery 11. Furthermore, in this embodiment, the value of the second voltage is an integer multiple of the value of the first voltage.

[0113] This embodiment includes one or more secondary batteries 11. In order to prevent the performance of the secondary batteries 11 from degrading or being damaged due to over-discharge or other factors during the charging process, in a preferred embodiment, when multiple secondary batteries 11 are included, the output voltage of the multiple secondary batteries 11 is equal. For example, the multiple secondary batteries 11 are all 4.2V lithium batteries.

[0114] In a specific embodiment of this utility model, the power supply system 10 may include one or more secondary batteries 11. When the power supply system 10 includes a secondary battery 11 (for example, the power supply system 10 includes a detachable battery mounting slot), the output mode of the control module 13 can be switched to charge the secondary battery 11 with a first voltage, wherein the value of the first voltage is not greater than the charging limit voltage of the secondary battery 11, and preferably equal to the charging limit voltage of the secondary battery 11.

[0115] When the power supply system 10 includes multiple secondary batteries 11, such as two or three, the output mode of the control module 13 can be switched to charge the secondary batteries 11 with a second voltage. For example, when the power supply system 10 includes two secondary batteries 11, the value of the second voltage can be twice the value of the first voltage. When the power supply system 10 includes three secondary batteries 11, the value of the second voltage can be three times the value of the first voltage.

[0116] When the secondary battery 11 is fully charged (or nearly fully charged), the output mode of the power supply module 13 can be switched to stop charging the secondary battery 11 to avoid continuous charging of the secondary battery 11 for a long time, which would keep the secondary battery 11 in a fully charged state for a long time and affect the service life of the secondary battery 11.

[0117] Figures 4-5C The circuit design of the adjustment unit 133, the first detection module 12, and the second detection module 14 according to a preferred embodiment of the present invention is shown below. Figures 4-5C The adjustment unit 133 will be described.

[0118] like Figure 4 As shown, the adjustment unit 133 includes a first adjustment circuit 1331 and a first adjustment port 1332, wherein the first adjustment circuit 1331 and the first detection module 12 are electrically connected. Figure 4 (represented by dashed lines), for example, directly connected or connected through the microcontroller unit 134, the first adjustment port 1332 and the first adjustment circuit 1331 are electrically connected.

[0119] When the output voltage of the secondary battery 11 is higher than the first preset value, the first regulating circuit 1331 is connected and grounded, such as Figure 4As shown, when the first adjustment circuit 1331 is connected and grounded, the first adjustment port 1332 is grounded, and the control module 13 switches to the output mode of stopping charging the secondary battery 11.

[0120] According to specific embodiments of this utility model, such as Figure 4 As shown, the first regulating circuit 1331 includes a field-effect transistor. When the CHARGE1 pin of the first regulating circuit 1331 outputs a high level (according to the first detection module 12 detecting that the output voltage of the secondary battery 11 is higher than a first preset value), resistors R1 and R2 form a voltage divider circuit to provide the gate voltage to the field-effect transistor, the drain and source terminals of the field-effect transistor are turned on, and CHARGE1 is grounded. The control module 13 stops charging the secondary battery 11.

[0121] When the output voltage of the secondary battery 11 is higher than the first preset value, it indicates that the secondary battery 11 has a high charge level. In this case, there is no need to charge the secondary battery 11. The control module 13 is switched to the output mode of stopping charging the secondary battery 11 by the adjustment unit 133. The first preset value can be set according to the operating power of the electrical equipment 20, the operating time required for the electrical equipment 20, and the self-discharge rate of the secondary battery 11. For example, at the voltage value of the second preset value, the secondary battery 11 can provide enough charge for the electrical equipment 20 to operate continuously for three days.

[0122] When the output voltage of the secondary battery 11 is not higher than the first preset value, the first adjustment circuit 1331 is disconnected, such as... Figure 4 As shown, the first adjustment port 1332 is pulled up, and the output module 13 switches to the output mode of charging the secondary battery 11 with the second voltage.

[0123] Specifically, such as Figure 4 As shown, when the CHARGE1 pin of the first adjustment circuit 1331 outputs a low level (according to the first detection module 12, the output voltage of the secondary battery 11 is not higher than the first preset value), the gate voltage of the field-effect transistor is 0, the field-effect transistor is not turned on, the first adjustment port 1332 is pulled up through the resistor R3, and the output port 132 can charge the secondary battery 11 with the second voltage.

[0124] When the output voltage of the secondary battery 11 is not higher than the first preset value, it indicates that the power of the secondary battery 11 is low, which may affect the normal use of the electrical equipment 20. In this embodiment, the output voltage of the secondary battery 11 is detected by the first detection module 12, and the secondary battery 11 is charged by the control module 13 with the second voltage.

[0125] The above is only a specific circuit design in the preferred embodiment of this utility model. In different embodiments of this utility model, the adjustment unit 133 and the first detection module 12 may be selected from other circuit designs that can achieve the same or similar functions.

[0126] According to a preferred embodiment of the present invention, such as Figure 4 As shown, the adjustment unit 133 also includes a second adjustment circuit 1333, a second adjustment port 1334, and a switch 1335. In this embodiment, the second adjustment circuit 1333 and the second detection module 14 are electrically connected ( Figure 4 (Represented by dashed lines in the middle), the second adjustment port 1334 is floating. The switch 1335 is configured to be controlled by the second adjustment circuit 1333, switching between the first adjustment port 1332 and the second adjustment port 1334.

[0127] In this embodiment, the second adjustment circuit 1333 connects or disconnects based on the voltage of the input port 131. Specifically, the second detection module 14 acquires the voltage of the input port 131 and changes the level of the CHARGE2 pin. For example... Figure 4 As shown, the second adjustment circuit 1333 includes a field-effect transistor. When the CHARGE2 pin outputs a high level, resistors R4 and R5 form a voltage divider circuit, providing voltage to the gate (G) of the field-effect transistor. The drain (D) and source (S) of the field-effect transistor are then connected. Switch 1335 and the second adjustment port 1334 are connected, for example... Figure 4 As shown, the second adjustment circuit 1333 includes an electromagnet, which can control the switch 1335 to move to the second adjustment port 1334.

[0128] In this embodiment, the second adjustment port 1334 is floating, and the port connected to the switch 1335 is in a floating adjustment state. Through other circuit designs, the control module 13 can be switched to the output mode of charging the secondary battery 11 with the first voltage.

[0129] When CHARGE2 outputs a low level, the field-effect transistor in the second adjustment circuit 1333 is not turned on, the second adjustment circuit 1333 is turned off, and the switch 1335 remains connected to the first adjustment port 1332.

[0130] In this embodiment, the control module 13 can change the output mode based on the voltage of the input port 131 obtained by the second detection module 14. When the power supply system 10 includes a single secondary battery 11, the installer can adjust the voltage of the input port 131 to connect the second adjustment circuit 1333, and the control module 13 will charge the secondary battery 11 with a first voltage. When the power supply system 10 includes multiple secondary batteries 11 connected in series, by adjusting the voltage of the input port 131, the second adjustment circuit 1333 is disconnected, and the switch 1335 is connected to the first adjustment port 1332. As described in the previous embodiment, the control module 1335 can charge the secondary battery 11 with the first voltage or stop charging the secondary battery 11. Furthermore, the first voltage is not greater than the second voltage, which can prevent excessive charging voltage from damaging the secondary battery 11.

[0131] According to a preferred embodiment of the present invention, the control module 13 further includes a microcontroller unit 134, such as... Figure 5C As shown, the microcontroller unit 134 can be a chip with multiple pins, for example, the microcontroller unit 134 includes four pins.

[0132] In this embodiment, the first adjustment circuit 1331 is electrically connected to the first detection module 12 via the microcontroller unit 134. For example, the circuit of the first detection module 12 is as follows: Figure 5A As shown, pin OUT1 in the first detection module 12 and pin CHARGE1 in the first adjustment circuit 1331 are respectively connected to a pin in the microcontroller unit 134.

[0133] The second adjustment circuit 1333 is electrically connected to the microcontroller unit 134 and the second detection module 14. For example, the circuit of the second detection module 14 is as follows: Figure 5B As shown, pin IN1 in the second detection module 14 and pin CHARGE2 in the second adjustment circuit 1333 are respectively connected to a pin in the microcontroller unit 134.

[0134] Specifically, the regulating unit 133 can integrate a circuit breaker. Based on the first detection module 12 and the second detection module 14, the regulating unit 133 can switch to different output modes. Preferably, the regulating unit 133 is detachably mounted in a fixed position to match the voltage of the input port 131. In the circuit of the regulating unit 133, the values ​​of various electrical components are related to the voltage of the input port 131, such as the resistance values ​​of resistors R4 and R5. In different application scenarios, regulating units 133 with different parameters can be disassembled and replaced to match the voltage of the input port 131. Furthermore, the regulating unit 133 can be used as a separate module, detachably connected from other components in the control module 13, to simplify the disassembly and replacement of the regulating unit 133.

[0135] According to a preferred embodiment of the present invention, the power supply system 10 further includes a circuit conversion module 15. In this embodiment, the input port 131 is electrically connected to the external power supply 30 through the circuit conversion module 15, and the circuit conversion module 15 is configured to output DC power to the control module 13.

[0136] Specifically, the circuit of circuit conversion module 15 is as follows: Figure 6 As shown, the circuit conversion module 15 is connected to the neutral and live wires of the mains power supply and is capable of converting AC power into DC power before outputting it to the control module 13. Furthermore, the circuit conversion module 15 is configured to reduce the voltage of the mains power supply. For example, the circuit conversion module 15 includes a voltage management unit 151, which reduces the voltage of the DC power output from the circuit conversion module 15 to the control module 13 to below 36V, thereby improving the safety of users operating the power supply system 10 and the electrical equipment 20.

[0137] In a preferred embodiment of this invention, the circuit conversion module 15 includes a switchable voltage management unit 151, such as a detachable and replaceable voltage management unit 151, or an adjustable and controllable voltage management unit 151. Different voltage management units 151 or different voltage levels within the voltage management unit 151 can output different DC voltages to the control module 13, such as 5V, 9V, 12V, etc., thereby improving the applicability of the power supply system 10.

[0138] Preferably, the DC voltage (voltage at input port 131) output by the circuit conversion module 15 to the control module 13 is slightly higher than the output voltage of the secondary battery 11 during normal operation. For example, if the power supply system 10 includes one secondary battery 11, which is a 4.2V lithium battery, the DC voltage output by the circuit conversion module 15 to the control module 13 can be switched to 5V. When the power supply system 10 includes two secondary batteries 11, both of which are 4.2V lithium batteries, the voltage after the two secondary batteries 11 are connected in series is 8.4V, and the DC voltage output by the circuit conversion module 15 to the control module 13 can be switched to 9V.

[0139] like Figure 7As shown, in a preferred embodiment of this utility model, the power supply system 10 further includes a power supply module 16, which is electrically connected to the circuit conversion module 15 and the secondary battery 11. The power supply module 10 is configured to supply power to the electrical device 20, for example, the secondary battery 11 is powered by the power supply module 16. Furthermore, when the external power supply 30 is working normally, and the load on the electrical device 20 is zero, the output voltage of the circuit conversion module 15 is greater than the output voltage of the secondary battery 11. In this embodiment, when the external power supply 30 is working normally, the circuit conversion module 15 supplies power to the electrical device 20, preferably outputting DC power to the electrical device 20. Further, the output voltage of the circuit conversion module 15 to the electrical device 20 is equal to the voltage of the DC power output by the circuit conversion module 15 to the control module 13, thereby simplifying the circuit design of the circuit conversion module 15.

[0140] like Figure 8 As shown, according to a preferred embodiment of the present invention, the power supply module 16 includes a power supply port 161 and a power supply compensation unit 162. The power supply port 161 is configured to connect to the power-consuming device 20 (…). Figure 8 Electrical connection (indicated by dashed lines), circuit conversion module 15 ( Figure 8 (Indicated by dashed lines) and electrically connected to power supply port 161.

[0141] Secondary battery 11 ( Figure 8 (Represented by dashed lines) After passing through the power supply compensation unit 162, it is connected to the power supply port 161, and the power supply compensation unit 162 is configured to supply power to the electrical device 20 when the output voltage of the circuit conversion module 15 is lower than the output voltage of the secondary battery 11.

[0142] At the moment of startup, some electrical devices 20, such as those including motors or requiring motor drive, generate a large transient pumping current, which may prevent the circuit conversion module 15 from supplying power to the device 20. Designing the circuit conversion module 15 to output current sufficient to meet the maximum instantaneous current of the device 20 would not only increase costs but also require more space. In this embodiment, at the moment of startup, the pumping current increases, and the circuit conversion module 15's power supply capacity cannot meet the demand, causing a drop in output voltage. When the output voltage of the circuit conversion module 15 drops below the output voltage of the secondary battery 11, the power supply compensation unit 162 is activated to allow the secondary battery 11 to supply power to the device 20. When the output voltage of the circuit conversion module 15 is lower than the output voltage of the secondary battery 11, and the output voltage of the circuit conversion module 15 is not zero (a zero output voltage indicates that the external power supply 30 is disconnected), the circuit conversion module 15 and the secondary battery 11 jointly supply power to the device 20 to meet its needs.

[0143] When the electrical equipment 20 enters the stable operation stage, the voltage of the circuit conversion module 15 gradually recovers to the preset value. When the output voltage of the circuit conversion module 15 is higher than the output voltage of the secondary battery 11, the power supply compensation unit 162 is disconnected, and the circuit conversion module 15 supplies power to the electrical equipment 20, and the secondary battery 11 stops discharging.

[0144] This embodiment can reduce the design specifications of the circuit conversion module 15, which is beneficial for reducing costs and space occupation. Furthermore, when the external power supply 30 can provide normal power, the secondary battery 11 is partially discharged, which is beneficial for improving the service life of the secondary battery 11 compared to not using it for a long time.

[0145] like Figure 8 As shown, according to a preferred embodiment of the present invention, the power supply compensation unit 162 includes a power supply field-effect transistor 1621 and a body diode 1622, wherein the body diode 1622 is connected between the drain and source terminals of the power supply field-effect transistor 1621.

[0146] When the circuit conversion module 15 and the secondary battery 11 jointly supply power to the electrical device 20, the secondary battery 11 is electrically connected to the power supply port 161 through the body diode 1622 to pull the voltage of the power supply port 161 up to the output voltage of the secondary battery 11, so as to meet the needs of the electrical device 20 and help reduce the maximum design current of the circuit conversion module 15.

[0147] When the output voltage of the circuit conversion module 15 is 0, it indicates that the external power supply 30 is de-energized, the power supply MOSFET 1621 is connected, and the secondary battery 11 directly supplies power to the device 20 through the power supply port 161. This also significantly reduces the voltage drop across the power supply MOSFET 1621, minimizing the power loss of the secondary battery 11. Furthermore, after the external power supply 30 is de-energized, the power supply MOSFET 1621 can quickly switch, ensuring uninterrupted power supply to the device 20.

[0148] According to a preferred embodiment of the present invention, such as Figure 8 As shown, the power supply module 16 also includes an anti-reverse current transistor 163. The circuit conversion module 15 is connected to the power supply port 161 after passing through the anti-reverse current transistor 163. The anti-reverse current transistor 163 is configured to block the secondary battery 11 from supplying power to the circuit conversion module 15, thereby preventing reverse charging.

[0149] In a preferred embodiment of this utility model, such as Figure 9As shown, the power supply system 10 also includes a current setting module 17, which is electrically connected to the control module 13. The current setting module 17 is configured to adjust the current of the output port 132 charging the secondary battery 11 to protect the secondary battery 11 and the electrical equipment 20. It can also adjust the current of the output port 132 charging the secondary battery 11 to meet different usage scenarios and improve the service life of the secondary battery 11.

[0150] Furthermore, according to a preferred embodiment of the present invention, the control module 13 is configured to charge the secondary battery 11 in a continuous charging and / or trickle charging manner, wherein the current control module 17 includes a charging current limiting resistor 171 and / or a trickle current limiting resistor 172.

[0151] The charging current-limiting resistor 171 is configured to change the current supplied to the secondary battery 11 via the output port 132 by altering its resistance value. For example... Figure 10 As shown, by changing the resistance value of the charging current-limiting resistor 171, the current supplied by the control module 13 to the secondary battery 11 can be altered. For electrical equipment 20 that experiences frequent power outages or requires frequent power cuts, the charging current supplied by the control module 13 to the secondary battery 11 can be increased to improve the user experience.

[0152] The trickle-limiting resistor 172 is configured to change the magnitude of the trickle current flowing from the output port 132 to the secondary battery 11 by altering its resistance value. For example... Figure 10 As shown, the trickle current limiting resistor 172 is connected to a pin of the control module 13. By changing the resistance value of the trickle current limiting resistor 172, the magnitude of the trickle current used by the control module 13 to charge the secondary battery 11 can be set. For example, in areas with low power outage frequency, the secondary battery 11 is used less frequently, so the trickle current can be reduced, for example, by setting the trickle current to 1 / 10 of the normal charging current, to protect the secondary battery 11. For areas with frequent power outages, the trickle current can be appropriately increased to reduce the charging time of the secondary battery 11.

[0153] like Figure 9 As shown, in a preferred embodiment of the present invention, the power supply system 10 further includes an overheat protection circuit 18, which is disposed between the control module 13 and the secondary battery 11. The overheat protection circuit 18 is configured to disconnect the electrical connection between the control module 13 and the secondary battery 11 when the temperature of the secondary battery 11 exceeds a first threshold. The first threshold can be preset according to the specific parameters of the secondary battery 11 and the application requirements.

[0154] Specifically, such as Figure 10As shown, in some embodiments of this utility model, the overheat protection circuit 18 may include a thermistor 111 inside the secondary battery 11 and a thermistor 181 outside the secondary battery 11. The thermistor 181 outside the secondary battery 11 is connected to the control module 13. The thermistors 111 and 181 are connected in parallel. When the temperature of the secondary battery 11 is too high, the resistance of 111 decreases, and the resistance of the parallel 181 also decreases accordingly. When the resistance of 181 drops to a preset value, the control module 13 is disconnected from the secondary battery 11, preventing further charging of the secondary battery 11 and preventing a safety accident.

[0155] According to a preferred embodiment of the present invention, such as Figure 9 As shown, the power supply system 10 also includes a charging indicator module 19, which is electrically connected to the control module 13 and configured to output different indicator signals according to the output mode of the control module 13, to remind the user of the output status of the control module 13. In a specific embodiment of this utility model, as... Figure 10 As shown, the charging indicator module 19 includes, for example, indicator lights D1 and D2. In different output modes, the control module 13 can make indicator lights D1 and D2 emit different colors of light or combinations of different colors of light.

[0156] like Figure 11 As shown, in a preferred embodiment of this utility model, the power supply system 10 is installed inside the junction box 40, which can be pre-embedded in the wall. Specifically, the junction box 40 includes a box body 41 and a connector 42, wherein the incoming mains power can be connected to the inside of the box body 41, and the power supply system 10 can be installed inside the box body 41 and electrically connected to the incoming mains power.

[0157] The connector 42 is located on the outer side of the housing 41. The inner side of the connector 42 is electrically connected to the power supply system 10. The outer side of the connector 42 may be provided with slots or electrical contacts, etc., for electrical connection. The power supply system 10 can be electrically connected to the electrical device 20 through the electrical connector. For example, the electrical device 20 includes a mating structure that matches the connector 42 so that the electrical device 20 can be connected to the junction box 40.

[0158] Furthermore, the electrical equipment 20 and the junction box 40 can be detachably connected to meet different user needs. According to a preferred embodiment of this utility model, the power supply system 10 and the junction box 40 can be integrated into a single module. The junction box 40 can be a standard specification junction box, such as an 86-type box. The power supply system 10 and the junction box 40 can be directly mounted on the wall or floor of the application scenario of the electrical equipment 20, resulting in an aesthetically pleasing and simple overall appearance.

[0159] like Figure 12As shown, this utility model also includes a power supply method 100 for electrical equipment, which uses the power supply system 10 described in the foregoing embodiments to supply power to the electrical equipment.

[0160] In step S101, the electrical connection between the electrical equipment and the power supply system is controlled. This connection may take various forms, such as plugging the electrical equipment into the power supply system or placing the electrical equipment on the power supply system.

[0161] In practical applications, the electrical connection between the device and the power supply system can be controlled when the device needs charging. For example, if the device has an integrated battery, the power supply system can be used to charge the battery. Alternatively, the device can maintain a connection with the power supply system. For instance, if the device is a control panel for a smart door or smart home system, and its location is relatively fixed, it can be configured to maintain a long-term electrical connection with the power supply system.

[0162] In step S102, the output voltage of the power supply system is obtained. Specifically, the output voltage of the power supply system can be obtained by the electrical equipment connected to the power supply system, or the power supply system can detect the output voltage and report it, or other electrical equipment, such as a control device or gateway installed outside the electrical equipment, can obtain it.

[0163] In this embodiment, when the external power supply is normal, the output voltage of the power supply system can be, for example, the DC voltage after being stepped down by the circuit conversion module, or the voltage of the mains power supply. When the external power supply is abnormal, such as when the external power supply is interrupted, the power supply system supplies power to the electrical equipment through a secondary battery, and the output voltage of the power supply system is the output voltage of the secondary battery (after deducting the voltage drop).

[0164] In step S103, it is determined whether the output voltage of the power supply system is lower than the second threshold. When the output voltage of the power supply system is lower than the second threshold, in step S104, the operating power of the electrical equipment is reduced. The second threshold can be set according to the output voltage of the power supply system. In this embodiment, when the external power supply is normal, the output voltage of the power supply system is greater than the maximum output voltage of the secondary battery. The second threshold can be set to be greater than the maximum output voltage of the secondary battery and less than the output voltage of the power supply system when the external power supply is normal.

[0165] Specifically, the power supply system includes a circuit conversion module, which steps down the external power supply voltage to output DC power. When the external power supply is normal, the output voltage of the power supply system is the output voltage of the circuit conversion module (after deducting the voltage drop), and the output voltage of the circuit conversion module is greater than the maximum output voltage of the secondary battery. The second threshold is set to be greater than the maximum output voltage of the secondary battery, but not greater than the output voltage of the circuit conversion module.

[0166] When the output voltage of the power supply system falls below the second threshold, it indicates an abnormality in the external power supply, and the system switches to power supply from a secondary battery. To extend the usage time of the electrical equipment under secondary battery power, this embodiment controls the electrical equipment to reduce its operating power. For example, if the electrical equipment is a smart door, when powered by a secondary battery, the smart door can disable unnecessary auxiliary functions, retaining only the functions of driving the lock motor and user identification. Preferably, the electrical equipment can be preset with a specific low-power operating mode. When the obtained output voltage of the power supply system falls below the second threshold, the electrical equipment is switched to the low-power operating mode.

[0167] When the output voltage of the power supply system is not lower than the second threshold, such as Figure 12 As shown, in step S105, the electrical equipment is controlled to operate normally in order to maintain its functionality.

[0168] Figure 13 The flowchart of a power supply method 200 for an electrical device according to a preferred embodiment of the present invention is shown. In the power supply method 200, steps S201, S202, S203 and S206 are basically the same as steps S101, S102, S103 and S105 in the power supply method 100 for an electrical device in the foregoing embodiment, and will not be described again here.

[0169] like Figure 13 As shown, in step S204, when the output voltage of the power supply system is lower than the second threshold, it is determined whether the duration of the power supply system's output voltage being lower than the second threshold is greater than the third threshold. Some electrical devices may generate a large current at the moment of startup, such as electrical devices including motors or drive motors. The startup of electrical devices may also cause the output voltage of the power supply system to drop below the second threshold. For example, in the aforementioned embodiment where the circuit conversion module and the secondary battery jointly power the electrical device, the output voltage of the power supply system is pulled up to the output voltage of the secondary battery, which is lower than the second threshold, but the external power supply does not show any abnormality.

[0170] Therefore, in this embodiment, when the duration of the power supply system's output voltage being lower than the second threshold is not greater than the third threshold, the time for the power supply system's output voltage to decrease is relatively short, and in step S206, the electrical equipment is controlled to operate normally.

[0171] If the duration of the power supply system's output voltage being lower than the second threshold is greater than the third threshold, it indicates that the power supply system has been powered by the secondary battery for a long time and the external power supply is abnormal. In step S205, the operating power of the electrical equipment is reduced to extend the usage time of the electrical equipment.

[0172] Finally, it should be noted that the above descriptions are merely embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power supply system applied to an electric device, the power supply system being provided outside the electric device, characterized by, The power supply system comprises: a secondary battery configured to be capable of outputting electric energy to the electric device; a first detection module electrically connected to an output terminal of the secondary battery and configured to be capable of detecting an output voltage of the secondary battery; and a control module comprising: an input port electrically connected to an external power supply; an output port electrically connected to the secondary battery and configured to be capable of charging the secondary battery; wherein the control module is electrically connected to the first detection module and configured to be capable of changing the voltage of the output port charging the secondary battery according to the voltage of the secondary battery.

2. The power supply system of claim 1, wherein The power supply system further comprises: a second detection module electrically connected to the input port, the second detection module being configured to be capable of detecting the voltage of the input port; and the control module being configured to acquire the voltage of the input port from the second detection module and change the voltage of the output port charging the secondary battery according to the voltage of the input port.

3. The power supply system of claim 2, wherein, The control module has multiple output modes of charging the secondary battery, and the control module further comprises: an adjusting unit electrically connected to the first detection module and the second detection module, the adjusting unit being configured to switch the output mode according to the output voltage of the secondary battery acquired by the first detection module and the voltage of the input port acquired by the second detection module.

4. The power supply system of claim 3, wherein The output mode comprises: charging the secondary battery at a first voltage; charging the secondary battery at a second voltage; and stopping charging the secondary battery; wherein the value of the second voltage is an integer multiple of the value of the first voltage.

5. The power supply system of claim 4, wherein, The adjusting unit comprises: a first adjusting circuit electrically connected to the first detection module; and a first adjusting port electrically connected to the first adjusting circuit; wherein when the output voltage of the secondary battery is higher than a first preset value, the first adjusting circuit is connected and grounded; and when the output voltage of the secondary battery is not higher than the first preset value, the first adjusting circuit is disconnected; when the first adjusting circuit is connected and grounded, the first adjusting port is grounded, and the control module is switched to the output mode of stopping charging the secondary battery; when the first adjusting circuit is disconnected, the control module is switched to the output mode of charging the secondary battery at the second voltage.

6. The power supply system of claim 5, wherein, The adjusting unit further comprises: a second adjusting circuit electrically connected to the second detection module; a second adjusting port floating; and a switch configured to be capable of being controlled by the second adjusting circuit to switch between the first adjusting port and the second adjusting port; wherein the second adjusting circuit is connected or disconnected according to the voltage of the input port; when the second adjusting circuit is connected, the switch is connected to the second adjusting port, and the control module is switched to the output mode of charging the secondary battery at the first voltage. When the second regulating circuit is disconnected, the switch and the first regulating port are connected.

7. The power supply system of claim 6, wherein, The control module further comprises: a micro control unit, the first regulating circuit is electrically connected with the first detecting module through the micro control unit, and the second regulating circuit is electrically connected with the second detecting module through the micro control unit.

8. The power supply system of claim 6, wherein, The first regulating circuit and the second regulating circuit comprise field effect transistors.

9. The power supply system according to any one of claims 1 to 8, characterized by, The power supply system further comprises: a circuit conversion module, the input port is electrically connected with the external power supply through the circuit conversion module, and the circuit conversion module is configured to output direct current to the control module.

10. The power supply system of claim 9, wherein, The circuit conversion module comprises a switchable voltage management unit and is configured to switch the voltage management unit to output direct current with different voltages to the control module.

11. The power supply system of claim 9, wherein, The power supply system further comprises: a power supply module, the power supply module is electrically connected with the circuit conversion module and the secondary battery, and is configured to supply power to the power consuming device, and when there is no load, the output voltage of the circuit conversion module is greater than the output voltage of the secondary battery.

12. The power supply system of claim 11, wherein, The power supply module comprises: a power supply port, the power supply port is electrically connected with the power consuming device, the circuit conversion module is electrically connected with the power supply port, and a power supply compensation unit, the secondary battery is connected to the power supply port through the power supply compensation unit, and the power supply compensation unit is configured to supply power to the power consuming device by the secondary battery when the output voltage of the circuit conversion module is lower than the output voltage of the secondary battery.

13. The power supply system of claim 12, wherein, The power supply compensation unit comprises: a power supply field effect transistor; a body diode, connected between the D terminal and the S terminal of the power supply field effect transistor; When the output voltage of the circuit conversion module is lower than the output voltage of the secondary battery and the output voltage of the circuit conversion module is not zero, the circuit conversion module and the secondary battery jointly supply power to the power consuming device, the secondary battery is electrically connected with the power supply port through the body diode to pull up the voltage of the power supply port to the output voltage of the secondary battery; When the output voltage of the circuit conversion module is zero, the power supply field effect transistor is connected, and the secondary battery is connected to the power supply port through the power supply field effect transistor to supply power to the power consuming device.

14. The power supply system according to claim 12 or 13, characterized by The power supply module further comprises: a reverse current prevention transistor, the circuit conversion module is connected to the power supply port through the reverse current prevention transistor, and the reverse current prevention transistor is configured to block the secondary battery from supplying power to the circuit conversion module.

15. The power supply system according to any one of claims 3 to 8, characterized by, The regulating unit is detachably arranged at a fixed position to match the voltage of the input port, and the secondary battery is detachably arranged at a fixed position.

16. The power supply system of any one of claims 1-8, wherein, The power supply system further comprises: a current setting module, electrically connected with the control module and configured to adjust the current size of the output port charging the secondary battery.

17. The power supply system of claim 16, wherein, The control module is configured to charge the secondary battery in a continuous charging and / or trickle charging manner; the current setting module comprises: a charging current-limiting resistor configured to change the current size of the output port charging the secondary battery by changing the resistance value of the charging current-limiting resistor; and / or a trickle current-limiting resistor configured to change the trickle current size of the output port charging the secondary battery by changing the resistance value of the trickle current-limiting resistor.

18. The power supply system of any one of claims 1-8, wherein, The power supply system further comprises: a thermal protection circuit arranged between the control module and the secondary battery and configured to disconnect the electrical connection between the control module and the secondary battery when the temperature of the secondary battery exceeds a first threshold value.

19. The power supply system according to any one of claims 3-8, characterized in that, The power supply system further comprises: a charging indication module electrically connected with the control module and configured to output different indication signals according to the output mode of the control module.

20. The power supply system of any one of claims 1-8, wherein, The power supply system is arranged in a junction box, and the external power supply is a mains power supply.

21. The power supply system of claim 20, wherein, The power supply system is electrically connected with the electrical equipment through an electrical connector. The power supply system is electrically connected with the electrical equipment through an electrical connector.

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