Composite power supply system and control method

Abstract

The invention provides a composite power supply system and a control method. The system comprises a capacitor power supply module and a battery power supply module, the two modules can supply power to a load, and the battery module can charge the capacitor module. The system has at least two working modes: in the first mode, the two modules supply power at the same time; and in the second mode, the battery module independently supplies power and charges the capacitor module. The system efficiency can be improved, and the safety and stability of power supply are enhanced.

Description

Technical Field

[0001] The present application relates to the field of power supplies, and in particular to a composite power supply system and a control method. Background Art

[0002] In the current field of electronic equipment and systems, power supply technology plays a vital role. However, with the continuous advancement of technology and the continuous enrichment of electronic equipment functions, the existing power supply methods have gradually exposed some limitations and can no longer meet the growing load requirements.

[0003] Traditional power supply methods, such as using batteries or capacitors alone for power supply, have obvious shortcomings. Although batteries can provide stable energy output, their energy density is limited, and their performance will gradually decline during frequent charging and discharging, affecting their service life. In addition, when load demand suddenly increases, the battery may not be able to respond quickly, resulting in system performance degradation or failure. Although capacitors have the ability to charge and discharge quickly, their energy storage capacity is relatively weak and cannot provide long-term continuous power supply. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a composite power supply system and a control method, which can improve system efficiency and enhance the safety and stability of power supply.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a composite power supply system, the system comprising:

[0007] Capacitor power supply module and battery power supply module;

[0008] The capacitor power supply module and the battery power supply module are respectively used to supply power to the load, the discharge end of the capacitor power supply module is connected to the load, and the discharge end of the battery power supply module is connected to the load;

[0009] The battery power supply module is also used to charge the capacitor power supply module, and the output end of the battery power supply module is connected to the input end of the capacitor power supply module;

[0010] The system includes at least a first working mode and a second working mode. In the first working mode, the capacitor power supply module and the battery power supply module simultaneously supply power to the load; in the second working mode, the battery power supply module supplies power to the load and charges the capacitor power supply module.

[0011] In a second aspect, an embodiment of the present application further provides a composite power system control method, the method comprising:

[0012] The system mode is judged, and if the system mode is the discharge mode, the power required by the load is calculated, and if the power required by the load is greater than the current power, the first relay and the fourth relay are simultaneously turned on to enter the high power mode to supply power to the load;

[0013] If the power required by the load is less than the current power, the load is supplied with power by opening the fourth relay and entering a low power mode;

[0014] In the low power mode, if the working voltage of the capacitor power supply module is less than the working threshold, the capacitor power supply module is charged by opening the third relay to enter the power replenishment mode;

[0015] If the system mode is a charging mode, the capacitor power supply module and the battery power supply module are charged respectively by closing the first relay and the fourth relay and opening the third relay and the sixth relay to enter the charging mode;

[0016] If the system mode is fault detection, all relays are closed.

[0017] The embodiments of the present application have the following beneficial effects:

[0018] First of all, the system has efficient dynamic power supply capabilities and can accurately match load requirements, especially in application scenarios such as new energy vehicles and drones that require fast response and high energy management efficiency. This efficient energy utilization method not only improves the overall performance, but also enhances the wide applicability of the system.

[0019] Secondly, through multi-branch design and intelligent management strategy, the system significantly enhances stability and reliability. Each functional module operates independently, realizing redundant design. Even if a part fails, it will not affect the overall power supply. At the same time, the system can intelligently manage the charging and discharging process of the capacitor power supply module and the battery power supply module, avoiding problems such as overcharging and over-discharging, thereby effectively extending the service life of the power supply module.

[0020] Third, the control method intelligently adjusts the power supply mode according to the load demand to achieve precise power distribution. When the power demand is high, the system can respond quickly and provide sufficient power; when the power demand is low, it can reduce energy consumption by optimizing the power supply strategy. In addition, the system also has a fault detection function, which can quickly shut down the relay when a fault occurs, protecting the system from further damage and improving overall safety.

[0021] Finally, the composite power system adopts a lightweight design, which makes the overall weight controlled, and is particularly suitable for applications with strict weight requirements. At the same time, through the integrated controller and sensor, the system realizes intelligent management, reducing the difficulty of operation and maintenance costs. This intelligent management method not only improves the operating efficiency of the system, but also brings users a more convenient and efficient use experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a principle block diagram of a composite power supply system provided in an embodiment of the present application;

[0024] Figure 2 It is a flow chart of the composite power system control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0026] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0027] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0028] In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0029] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0031] See also Figure 1 , Figure 1 This is a block diagram of the principle of the composite power system provided by the embodiment of the present application, which will be combined with Figure 1 Provide explanation.

[0032] like Figure 1 As shown, an embodiment of the present application provides a composite power supply system, the system comprising:

[0033] Capacitor power supply module and battery power supply module;

[0034] In the embodiment of the present application, the battery power supply module is composed of a plurality of lithium batteries connected in series, and the capacitor power supply module is composed of a plurality of super capacitors connected in series.

[0035] The capacitor power supply module and the battery power supply module are respectively used to supply power to the load, the discharge end of the capacitor power supply module is connected to the load, and the discharge end of the battery power supply module is connected to the load;

[0036] The battery power supply module is also used to charge the capacitor power supply module, and the output end of the battery power supply module is connected to the input end of the capacitor power supply module;

[0037] The system includes at least a first working mode and a second working mode. In the first working mode, the capacitor power supply module and the battery power supply module simultaneously supply power to the load; in the second working mode, the battery power supply module supplies power to the load and charges the capacitor power supply module.

[0038] The capacitor power supply module is composed of multiple supercapacitors in series. Supercapacitors have the characteristics of fast charging and discharging, high power density and long cycle life, which are very suitable for providing instantaneous high power output or as energy buffer. The battery power supply module is composed of multiple lithium batteries in series. Lithium batteries have high energy density, long storage time and relatively stable output voltage, which are ideal for providing continuous and stable energy output.

[0039] The discharge terminals of the capacitor power supply module and the battery power supply module are both connected to the load, and they can directly provide electrical energy to the load. The output terminal of the battery power supply module is also connected to the input terminal of the capacitor power supply module, so that the battery can charge the capacitor power supply module when necessary.

[0040] The composite power supply system includes at least two working modes: the first working mode and the second working mode. The first working mode: In this mode, the capacitor power supply module and the battery power supply module supply power to the load at the same time. This usually occurs when the load requires high power output or the system requires fast response. The fast discharge capability of the supercapacitor can quickly meet the instantaneous high power demand of the load, while the lithium battery provides stable energy output.

[0041] Second working mode: In this mode, the battery power module supplies power to the load alone and charges the capacitor power module. This usually occurs when the load power demand is low or the system is idle. At this time, the lithium battery can use its high energy density to provide long-term stable power supply to the load, while using excess energy to charge the supercapacitor for emergency use.

[0042] In some embodiments, the capacitor power supply module includes a first branch, a second branch, a third branch, and a fourth branch that are independent of each other;

[0043] The first branch is used to supply power to the load; the second branch is used to receive charging from the battery power supply module; the third branch is used for voltage detection; and the fourth branch is used to charge the capacitor power supply module.

[0044] The first branch is connected to the load via a first transformer, and a first relay is provided in the first branch, and the first relay is used to control the opening and closing of the first branch;

[0045] The second branch is connected to the battery power supply module through a power supply module TPS92550EVM, and a second relay is provided in the second branch, and the second relay is used to control the opening and closing of the second branch;

[0046] The third branch is connected to a voltage detection module, and the voltage detection module is used to detect the supply voltage of the capacitor power supply module;

[0047] The fourth branch is connected to the first charging management module. A third relay is provided in the fourth branch. The third relay is used to control the opening and closing of the fourth branch.

[0048] The capacitor power supply module in the composite power supply system contains four independent branches, each of which has different tasks. The following is a detailed analysis of these branches:

[0049] The first branch is used to directly provide electrical energy to the load and is connected to the load through the first transformer. This design may be helpful for voltage regulation and isolation. The first relay is used to control the opening and closing of the branch, thereby realizing the control of the power supply to the load.

[0050] The second branch receives power from the battery power module to charge the supercapacitor in the capacitor power module, and is connected to the battery power module through the power module TPS92550EVM (the TPS92550EVM module is an LED constant current power module produced by TI (Texas Instruments), which contains voltage input +- and output +-, the input end is connected to the battery, and the output end is connected to the supercapacitor to form the entire power supply circuit). The second relay is used to control the opening and closing of the branch, thereby realizing the control of the charging process.

[0051] The third branch is connected to the voltage detection module, which is used to monitor the supply voltage of the capacitor power supply module in real time. Voltage detection is crucial to ensure the stable operation of the system. It can help the system monitor the status of the capacitor power supply module and take measures to prevent overvoltage or undervoltage when necessary. The third branch is directly connected to the voltage detection module.

[0052] The fourth branch provides another charging path for the capacitor power supply module, which is used as a backup when the battery power supply module is unavailable or the charging efficiency is low. The external power supply or backup power supply is connected through the first charging management module. The third relay is used to control the opening and closing of the branch, thereby realizing the control of the backup charging process.

[0053] The design of the above four branches makes the capacitor power supply module highly integrated and functional, and can meet multiple needs such as power supply, charging and voltage detection at the same time. By controlling the opening and closing of different branches, the system can flexibly adjust the working mode according to the actual situation to ensure the stability and efficiency of the system. The use of multiple relays and power management modules improves the redundancy and reliability of the system and reduces the impact of a single component failure on the entire system.

[0054] In some embodiments, the battery power supply module includes a fifth branch, a sixth branch, and a seventh branch that are independent of each other;

[0055] The fifth branch is used to supply power to the load; the sixth branch is used to charge the capacitor power supply module; and the seventh branch is used to charge the battery power supply module.

[0056] The fifth branch is connected to the load via a second transformer, a fourth relay is provided in the fifth branch, and the fourth relay is used to control the opening and closing of the fifth branch;

[0057] The sixth branch is connected to the capacitor power supply module through a power supply module TPS92550EVM, and a fifth relay is provided in the sixth branch, and the fifth relay is used to control the opening and closing of the sixth branch;

[0058] The seventh branch is connected to the second charging management module. A sixth relay is provided in the seventh branch. The sixth relay is used to control the opening and closing of the seventh branch.

[0059] The fifth branch directly supplies power to the load. It is connected to the load through the second transformer. This design helps to regulate the voltage and isolate the load, enhancing the safety of the system. The fourth relay is responsible for controlling the on and off of this branch, thereby achieving accurate management of the load power supply.

[0060] The sixth branch provides charging power for the supercapacitor in the capacitor power supply module. It is connected to the capacitor power supply module through the power supply module TPS92550EVM. The fifth relay is responsible for controlling the on and off of this branch to ensure the safety and controllability of the charging process.

[0061] The seventh branch charges the lithium battery or other type of battery in the battery power module. It is connected to the second charging management module, which is responsible for monitoring and managing the battery charging process to ensure safe and efficient charging of the battery. The sixth relay is responsible for controlling the on and off of this branch, allowing the system to charge the battery when needed, or disconnect the charging connection when the battery is fully charged.

[0062] It should be noted that in the embodiment of the present application, the model of the first charging management module and the second charging management module are both BQ25798EVM. BQ25798EVM is produced by TI (Texas Instruments) and is a power charging management chip that can automatically identify an external charging adapter and charge the charging device according to the set values ​​(charging voltage upper limit, cut-off voltage, charging current and other parameters).

[0063] The battery-powered module is divided into multiple independent branches, each of which has a specific function. This design improves the maintainability and scalability of the system. By controlling the on and off of each branch through relays, the system can quickly cut off the power supply when necessary to prevent safety hazards such as short circuits and overcurrent. The system can flexibly adjust the working status of each branch according to load demand and battery status to achieve optimal energy management and system efficiency.

[0064] In some embodiments, the discharge end of the capacitor power supply module is connected in parallel with the discharge end of the battery power supply module to supply power to the load through a diode merging module.

[0065] The discharge ends of the capacitor power supply module and the battery power supply module are connected in parallel, which means that they can provide power to the load at the same time. This connection method helps to balance the output of the two power supply modules, ensuring that the load can obtain stable voltage and current. The diode merging module consists of at least one diode to prevent current backflow. When there is a difference in the output voltage of the two power supply modules, the diode only allows the module with higher voltage to supply power to the load, while preventing the module with lower voltage from becoming a load. In this way, the system can effectively utilize the energy of the two power supply modules while avoiding unnecessary energy loss.

[0066] In some embodiments, the system also includes a third operating mode, which is a charging mode. In the third operating mode, the capacitor power supply module and the battery power supply module stop supplying power to the load, and the capacitor power supply module and / or the battery power supply module enters a charging state.

[0067] Here, a third working mode, charging mode, is introduced in the composite power supply system. This mode allows the system to charge the capacitor power supply module and / or the battery power supply module when it does not need to supply power to the load, thereby ensuring that they always remain in the best working state. In charging mode, the system stops supplying power to the load and instead focuses on charging the capacitor power supply module and / or the battery power supply module. This mode is usually started automatically or manually when the system is idle, the load demand is low, or the power supply module is detected to be low in power.

[0068] In some embodiments, the system further includes a controller, which detects the power of the load in real time through a Hall sensor and switches the working mode of the composite power supply system according to the corresponding power demand.

[0069] The controller obtains the power data of the load in real time through the Hall sensor. The Hall sensor is a sensor based on the Hall effect, which can accurately measure the current and then calculate the power in combination with the voltage information. According to the monitored load power, the controller will determine which working mode the current system should be in. For example, when the load power is low, the system may be in standby or energy-saving mode; when the load power is high, it may be necessary to start the capacitor power supply module and / or the battery power supply module to meet the demand. Once the controller makes a decision, it will switch the working mode of the composite power supply system by controlling the switching state of components such as relays and transformers. The controller is also responsible for monitoring the overall status of the system, including key parameters such as voltage, current, and temperature. Once an abnormality is detected, the controller will immediately take measures, such as cutting off the power supply or switching to standby mode, to protect the system from damage.

[0070] See also Figure 2 , Figure 2 is a flow chart of a composite power system control method provided in an embodiment of the present application. The embodiment of the present application also provides a composite power system control method, the method comprising:

[0071] The system mode is judged, and if the system mode is the discharge mode, the power required by the load is calculated, and if the power required by the load is greater than the current power, the first relay and the fourth relay are simultaneously turned on to enter the high power mode to supply power to the load;

[0072] If the power required by the load is less than the current power, the load is supplied with power by opening the fourth relay and entering a low power mode;

[0073] In the low power mode, if the working voltage of the capacitor power supply module is less than the working threshold, the capacitor power supply module is charged by opening the third relay to enter the power replenishment mode;

[0074] If the system mode is a charging mode, the capacitor power supply module and the battery power supply module are charged respectively by closing the first relay and the fourth relay and opening the third relay and the sixth relay to enter the charging mode;

[0075] If the system mode is fault detection, all relays are closed.

[0076] Here, the system will first determine its operating mode based on the current state, which includes discharge mode, charge mode and fault detection mode.

[0077] In discharge mode, the system calculates the power required by the load. If the power required by the load is greater than the power that the current system can provide, the system will open the first relay and the fourth relay at the same time and enter the high power mode. At this time, the capacitor power supply module and the battery power supply module may work at the same time to meet the high power demand of the load. If the power required by the load is less than the power that the current system can provide, the system only opens the fourth relay and enters the low power mode. In this mode, the capacitor power supply module or the battery power supply module is mainly used to supply power to reduce energy consumption. In low power mode, if the operating voltage of the capacitor power supply module is lower than the set operating threshold, the system will open the third relay and enter the power replenishment mode. At this time, the battery power supply module or other external power supply will charge the capacitor power supply module to ensure that its voltage remains within the normal operating range.

[0078] In charging mode, the system closes the first and fourth relays and opens the third and sixth relays at the same time, so that the capacitor power supply module and the battery power supply module can be charged separately to ensure that they are always kept in the best working condition.

[0079] In fault detection mode, the system will close all relays to ensure the safety of the system. At the same time, the system may perform self-test to find and repair any potential faults.

[0080] In order to verify the performance of the present invention, the composite power system was installed in a high dynamic power demand scenario of new energy vehicles and experiments were carried out. The following are the test methods and results.

[0081] In the new energy vehicle scenario, the system is connected to an electronic load to simulate the dynamic power requirements of the vehicle during acceleration, cruising and deceleration. During the test, the system switches to high-power mode when the vehicle accelerates, and the supercapacitor and lithium battery work together to ensure instantaneous high-power output. When the vehicle is cruising, the system switches to low-power mode, with only the lithium battery providing continuous and stable power supply, while using excess energy to charge the supercapacitor. In addition, the overload protection function shows reliability in this scenario. When the power demand exceeds the safety threshold, the system quickly cuts off the supercapacitor output path to ensure safe operation of the equipment.

[0082] In summary, the embodiments of the present application have the following beneficial effects:

[0083] First of all, the system has efficient dynamic power supply capabilities and can accurately match load requirements, especially in application scenarios such as new energy vehicles and drones that require fast response and high energy management efficiency. This efficient energy utilization method not only improves the overall performance, but also enhances the wide applicability of the system.

[0084] Secondly, through multi-branch design and intelligent management strategy, the system significantly enhances stability and reliability. Each functional module operates independently, realizing redundant design. Even if a part fails, it will not affect the overall power supply. At the same time, the system can intelligently manage the charging and discharging process of the capacitor power supply module and the battery power supply module, avoiding problems such as overcharging and over-discharging, thereby effectively extending the service life of the power supply module.

[0085] Third, the control method intelligently adjusts the power supply mode according to the load demand to achieve precise power distribution. When the power demand is high, the system can respond quickly and provide sufficient power; when the power demand is low, it can reduce energy consumption by optimizing the power supply strategy. In addition, the system also has a fault detection function, which can quickly shut down the relay when a fault occurs, protecting the system from further damage and improving overall safety.

[0086] Finally, the composite power system adopts a lightweight design, which makes the overall weight controlled, and is particularly suitable for applications with strict weight requirements. At the same time, through the integrated controller and sensor, the system realizes intelligent management, reducing the difficulty of operation and maintenance costs. This intelligent management method not only improves the operating efficiency of the system, but also brings users a more convenient and efficient use experience.

[0087] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the method embodiment, and will not be repeated in this application. In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0088] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0089] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0090] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A composite power supply system, characterized in that: The system comprises: Capacitor power supply module and battery power supply module; The capacitor power supply module and the battery power supply module are respectively used to supply power to the load, the discharge end of the capacitor power supply module is connected to the load, and the discharge end of the battery power supply module is connected to the load; The battery power supply module is also used to charge the capacitor power supply module, and the output end of the battery power supply module is connected to the input end of the capacitor power supply module; The system includes at least a first working mode and a second working mode. In the first working mode, the capacitor power supply module and the battery power supply module simultaneously supply power to the load; in the second working mode, the battery power supply module supplies power to the load and charges the capacitor power supply module.

2. The system according to claim 1, characterized in that The capacitor power supply module comprises a first branch, a second branch, a third branch and a fourth branch which are independent of each other; The first branch is used to supply power to the load; the second branch is used to receive charging from the battery power supply module; the third branch is used for voltage detection; and the fourth branch is used to charge the capacitor power supply module.

3. The system according to claim 2, characterized in that The first branch is connected to the load via a first transformer, and a first relay is provided in the first branch, and the first relay is used to control the opening and closing of the first branch; The second branch is connected to the battery power supply module through a power supply module, and a second relay is provided in the second branch, and the second relay is used to control the opening and closing of the second branch; The third branch is connected to a voltage detection module, and the voltage detection module is used to detect the supply voltage of the capacitor power supply module; The fourth branch is connected to the first charging management module. A third relay is provided in the fourth branch. The third relay is used to control the opening and closing of the fourth branch.

4. The system according to claim 1, characterized in that The battery power supply module comprises a fifth branch, a sixth branch and a seventh branch which are independent of each other; The fifth branch is used to supply power to the load; the sixth branch is used to charge the capacitor power supply module; and the seventh branch is used to charge the battery power supply module.

5. The system according to claim 4, characterized in that The fifth branch is connected to the load via a second transformer, a fourth relay is provided in the fifth branch, and the fourth relay is used to control the opening and closing of the fifth branch; The sixth branch is connected to the capacitor power supply module through a power supply module, and a fifth relay is provided in the sixth branch, and the fifth relay is used to control the opening and closing of the sixth branch; The seventh branch is connected to the second charging management module. A sixth relay is provided in the seventh branch. The sixth relay is used to control the opening and closing of the seventh branch.

6. The system according to claim 1, characterized in that The battery power supply module is composed of a plurality of lithium batteries connected in series, and the capacitor power supply module is composed of a plurality of super capacitors connected in series.

7. The system according to claim 1, characterized in that The discharge end of the capacitor power supply module is connected in parallel with the discharge end of the battery power supply module and then supplies power to the load through a diode merging module.

8. The system according to claim 1, characterized in that The system also includes a third working mode, which is a charging mode. In the third working mode, the capacitor power supply module and the battery power supply module stop supplying power to the load, and the capacitor power supply module and / or the battery power supply module enters a charging state.

9. The system according to claim 1, characterized in that The system also includes a controller, which detects the power of the load in real time through a Hall sensor and switches the working mode of the composite power supply system according to the corresponding power demand.

10. A composite power system control method, characterized in that: The method comprises: The system mode is judged, and if the system mode is the discharge mode, the power required by the load is calculated, and if the power required by the load is greater than the current power, the first relay and the fourth relay are simultaneously turned on to enter the high power mode to supply power to the load; If the power required by the load is less than the current power, the load is supplied with power by opening the fourth relay and entering a low power mode; In the low power mode, if the working voltage of the capacitor power supply module is less than the working threshold, the capacitor power supply module is charged by opening the third relay to enter the power replenishment mode; If the system mode is a charging mode, the capacitor power supply module and the battery power supply module are charged respectively by closing the first relay and the fourth relay and opening the third relay and the sixth relay to enter the charging mode; If the system mode is fault detection, all relays are closed.

Images