Power supply system

Abstract

The invention discloses a power supply system which comprises a voltage conversion module and an uninterruptible power supply module. The input end of the voltage conversion module is used for being connected with a first power supply end, and the output end of the voltage conversion module is used for being connected with an electricity load; the input end of the uninterruptible power supply module is connected with the output end of the voltage conversion module, the output end of the uninterruptible power supply module is used for being connected with the electricity load, and the uninterruptible power supply module is used for supplying power to the electricity load when the voltage of the output end of the voltage conversion module meets the abnormal condition of power supply. According to the technical scheme, when the voltage of the output end of the voltage conversion module is unstable, the uninterruptible power supply module supplies power to the electric load, and the reliability and stability of the power supply system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a power supply system. Background Art

[0002] In recent years, the global energy consumption structure has been gradually shifting towards clean, low-carbon and efficient energy. In this process, renewable energy represented by solar energy and wind energy has received unprecedented attention and widespread application. However, the volatility and intermittency of renewable energy have brought many challenges to the stable operation of the energy system.

[0003] To ensure the safe and stable operation of renewable energy systems, a reliable power supply system plays a vital role. The power supply system must not only meet the power supply needs during normal operation, but also ensure the normal operation of key equipment and prevent data loss when the system is powered off. Therefore, providing a reliable and stable power supply system has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The embodiment of the present invention provides a power supply system to solve the problem of how to provide a reliable and stable power supply system.

[0005] A power supply system comprises a voltage conversion module and an uninterruptible power supply module; The input end of the voltage conversion module is used to connect to the first power supply end, and the output end of the voltage conversion module is used to connect to the power load; The input end of the uninterruptible power supply module is connected to the output end of the voltage conversion module, and the output end of the uninterruptible power supply module is used to connect the power load and supply power to the power load when the output end voltage of the voltage conversion module meets the power supply abnormality condition.

[0006] Furthermore, the abnormal power supply condition is that the output terminal voltage of the voltage conversion module is lower than the output terminal voltage of the uninterruptible power supply module.

[0007] Furthermore, the voltage conversion module includes an AC / DC voltage conversion module.

[0008] Further, the uninterruptible power supply module includes a power management module and a battery module; The battery module is used to connect the voltage conversion module and the power load; The power management module is connected to the voltage conversion module, the power load and the battery module, and is used to supply power to the power load through the battery module when the output terminal voltage of the voltage conversion module meets the power supply abnormality condition.

[0009] Furthermore, the power management module is also used to charge the battery module according to a first electrical signal output from the output end of the voltage conversion module when the output end voltage of the voltage conversion module does not meet the power supply abnormality condition.

[0010] Further, the power management module includes a main control module, a first switch circuit and a second switch circuit; The positive electrode of the battery module is used to connect the voltage conversion module and the power load; The first end of the first switch circuit is connected to the negative electrode of the battery module, and the second end of the first switch circuit is used to connect to the voltage conversion module; The first end of the second switch circuit is connected to the negative electrode of the battery module, and the second end of the second switch circuit is used to connect the power load; The main control module is connected to the voltage conversion module, the battery module, the first switch circuit and the second switch circuit, and is used to collect battery information of the battery module, and control the operation of the first switch circuit and the second switch circuit according to the battery information, so that when the output terminal voltage of the voltage conversion module meets the power supply abnormality condition, the power supply to the power load is supplied through the battery module, and when the output terminal voltage of the voltage conversion module does not meet the power supply abnormality condition, the battery module is charged according to the first electrical signal outputted from the output terminal of the voltage conversion module.

[0011] Furthermore, the power management module also includes a current limiting module; a first end of the current limiting module is connected to the voltage conversion module, and a second end of the current limiting module is connected to the second end of the first switch circuit, for adjusting the charging current of the battery module.

[0012] Further, the current limiting module includes a first inductor and a first transistor; The first inductor and the first transistor are arranged in series between the voltage conversion module and the second end of the first switch circuit.

[0013] Further, comprising a first diode and a second diode; An anode of the first diode is coupled to the output end of the voltage conversion module, and a cathode of the first diode is coupled to the battery module; An anode of the second diode is coupled to the battery module, and a cathode of the second diode is coupled to the power load.

[0014] Furthermore, it also includes a display module connected to the power management module; the power management module is used to control the display module to display the SOC information corresponding to the battery module.

[0015] The above-mentioned power supply system includes a voltage conversion module and an uninterruptible power supply module; the input end of the voltage conversion module is used to connect to the first power supply end, and the output end of the voltage conversion module is used to connect to the power load; the input end of the uninterruptible power supply module is connected to the output end of the voltage conversion module, and the output end of the uninterruptible power supply module is used to connect to the power load, and is used to supply power to the power load when the output end voltage of the voltage conversion module meets the power supply abnormality condition. When the voltage conversion module works normally, power is supplied to the power load through the voltage conversion module; when the output end voltage of the voltage conversion module meets the power supply abnormality condition, power is supplied to the power load, thereby ensuring that when the output end voltage of the voltage conversion module is unstable, the power load is supplied with power through the uninterruptible power supply module, thereby improving the reliability and stability of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0017] Figure 1 is a circuit diagram of a power supply system in one embodiment of the present invention; Figure 2 2 is another circuit diagram of a power supply system according to an embodiment of the present invention.

[0018] In the figure: 1. voltage conversion module; 2. uninterruptible power supply module; 21. power management module; 211. main control module; 212. first switch circuit; 213. second switch circuit; 214. current limiting module; 2141. first inductor; 2142. first transistor; 22. battery module; 3. first diode; 4. second diode; 5. power load. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0021] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0022] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0023] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "a", "an" and " / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the terms "consisting of" and / or "comprising" when used in this specification determine the presence of features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0024] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0025] The present embodiment provides a power supply system, which is applied to an energy storage device, and the energy storage device includes an energy storage system. Exemplarily, the energy storage system includes an energy storage battery, an energy storage inverter, a battery management system, an energy management system, a temperature control system, a fire protection system, and the power supply system in the present embodiment. The energy storage inverter is used to convert the direct current stored in the energy storage battery into alternating current for supply to the power grid or load, and can also convert the alternating current of the power grid into direct current and store it in the energy storage battery. The battery management system is used for battery status detection, balancing management, fault diagnosis and battery protection of the energy storage battery. The energy management system is used for real-time energy monitoring, demand response, load management, energy consumption prediction and optimization, and system integration. The temperature control system is responsible for monitoring and adjusting the temperature of the energy storage battery. The fire protection system is used to prevent and manage possible fires in the energy storage battery.

[0026] In this embodiment, the power supply system is used to provide uninterrupted power supply to the battery management system, energy management system, temperature control system, and fire protection system to ensure the normal operation of the battery management system, energy management system, temperature control system, and fire protection system and prevent system data loss.

[0027] This embodiment provides a power supply system, such as Figure 1 As shown, it includes a voltage conversion module 1 and an uninterruptible power supply module 2; the input end of the voltage conversion module 1 is used to connect to the first power supply end, and the output end of the voltage conversion module 1 is used to connect to the power load 5; the input end of the uninterruptible power supply module 2 is connected to the output end of the voltage conversion module 1, and the output end of the uninterruptible power supply module 2 is used to connect to the power load 5, and is used to supply power to the power load 5 when the output end voltage of the voltage conversion module 1 meets the power supply abnormality condition.

[0028] The first power supply terminal is used to connect to a renewable energy system or a power grid to provide AC power to the voltage conversion module 1. It can be understood that the renewable energy system includes solar energy and wind energy. The power load 5 includes the battery management system, energy management system, temperature control system, and fire protection system in the above embodiments.

[0029] As an example, the input end of the voltage conversion module 1 is used to connect to the first power supply end, and the output end of the voltage conversion module 1 is used to connect to the power load 5. In this embodiment, the input end of the voltage conversion module 1 receives the alternating current output by the first power supply end and converts it into direct current to the power load 5 to ensure that the power load 5 works normally.

[0030] As an example, the input end of the uninterruptible power supply module 2 is connected to the output end of the voltage conversion module 1, and the output end of the uninterruptible power supply module 2 is used to connect the power load 5, and is used to supply power to the power load 5 when the output end voltage of the voltage conversion module 1 meets the power supply abnormality condition. In this example, the power supply abnormality condition is used to determine whether the output end voltage of the voltage conversion module 1 is stable. When the output end voltage of the voltage conversion module 1 meets the power supply abnormality condition, that is, the output end voltage of the voltage conversion module 1 is unstable, and the power supply is abnormal. When the output end voltage of the voltage conversion module 1 does not meet the power supply abnormality condition, that is, the output end voltage of the voltage conversion module 1 is stable and the power supply is normal. In this example, when the output end voltage of the voltage conversion module 1 meets the power supply abnormality condition, that is, the output end of the voltage conversion module 1 cannot provide a stable voltage, the power load 5, that is, the battery management system, the energy management system, the temperature control system and the fire protection system, has a risk of data loss. At this time, the power load 5 is powered by the uninterruptible power supply module 2, so as to ensure that when the output end voltage of the voltage conversion module 1 is unstable, the power load 5 is powered by the uninterruptible power supply module 2, thereby improving the reliability and stability of the power supply system.

[0031] In this embodiment, the power supply system includes a voltage conversion module 1 and an uninterruptible power supply module 2; the input end of the voltage conversion module 1 is used to connect to the first power supply end, and the output end of the voltage conversion module 1 is used to connect to the power load 5; the input end of the uninterruptible power supply module 2 is connected to the output end of the voltage conversion module 1, and the output end of the uninterruptible power supply module 2 is used to connect to the power load 5, and is used to supply power to the power load 5 when the output end voltage of the voltage conversion module 1 meets the power supply abnormality condition. When the voltage conversion module 1 is operating normally, power is supplied to the power load 5 through the voltage conversion module 1; when the output end voltage of the voltage conversion module 1 meets the power supply abnormality condition, power is supplied to the power load 5, thereby ensuring that when the output end voltage of the voltage conversion module 1 is unstable, the power load 5 is supplied through the uninterruptible power supply module 2, thereby improving the reliability and stability of the power supply system.

[0032] In one embodiment, the power supply abnormality condition is that the output terminal voltage of the voltage conversion module 1 is lower than the output terminal voltage of the uninterruptible power supply module 2 .

[0033] In this embodiment, the output terminal voltage of the voltage conversion module 1 is less than the output terminal voltage of the uninterruptible power supply module 2. Exemplarily, when the renewable energy system or the power supply grid connected to the first power supply terminal fails or is abnormal and cannot provide AC power, the output terminal of the voltage conversion module 1 cannot output voltage, that is, the output terminal voltage of the voltage conversion module is less than the output terminal voltage of the uninterruptible power supply module 2. Therefore, it can be judged that the output terminal voltage of the voltage conversion module 1 is unstable and the power supply is abnormal, thereby ensuring the reliability and accuracy of the power supply abnormality judgment of the voltage conversion module 1.

[0034] As an example, the power supply abnormality condition is that the output voltage of the voltage conversion module 1 is lower than the output voltage of the uninterruptible power supply module 2, and the output voltage of the voltage conversion module 1 is lower than the output voltage of the uninterruptible power supply module 2 for a period of time greater than a preset time. This prevents misjudgment of failure or abnormality of the renewable energy system or power grid, and improves the accuracy of failure or abnormality judgment.

[0035] In one embodiment, the voltage conversion module 1 includes an AC / DC voltage conversion module 1. In this embodiment, the voltage conversion module 1 includes an AC / DC voltage conversion module 1, so that the AC / DC voltage conversion module 1 converts the AC power of the first power supply end into DC power, and supplies power to the power load 5 through the converted DC power to ensure that the power load 5 works normally.

[0036] In one embodiment, the uninterruptible power supply module 2 includes a power management module 21 and a battery module 22; the battery module 22 is used to connect the voltage conversion module 1 and the power load 5; the power management module 21 is connected to the voltage conversion module 1, the power load 5 and the battery module 22, and is used to supply power to the power load 5 through the battery module 22 when the output voltage of the voltage conversion module 1 meets the power supply abnormality condition.

[0037] As an example, the battery module 22 is used to supply power to the electrical load 5 when the output voltage of the voltage conversion module 1 meets the power supply abnormality condition, so as to ensure the normal operation of the electrical load 5. It can be understood that when the output voltage of the voltage conversion module 1 does not meet the power supply abnormality condition, the battery module 22 stores energy so that when the output voltage of the voltage conversion module 1 meets the power supply abnormality condition, there is enough electric energy to supply power to the electrical load 5. It can be understood that the battery module 22 can store energy through the electric energy output by the voltage conversion module 1, or it can store energy through the electric energy provided by other devices.

[0038] In this embodiment, by connecting the battery module 22 to the voltage conversion module 1 and the power load 5, the power management module 21 is connected to the voltage conversion module 1, the power load 5 and the battery module 22. When the output voltage of the voltage conversion module 1 does not meet the power supply abnormality condition, the power load 5 is directly powered by the voltage conversion module 1. When the output voltage of the voltage conversion module 1 meets the power supply abnormality condition, it is automatically switched to the battery module 22 to power the power load 5, thereby making the structure of the uninterruptible power supply module 2 more concise and reducing the occupied space. At the same time, the conversion time from the power supply of the power load 5 by the voltage conversion module 1 to the power supply of the power load 5 by the battery module 22 is reduced, thereby ensuring that the power load 5 works normally during the switching process.

[0039] In one embodiment, the power management module 21 is further used to charge the battery module 22 according to the first electrical signal output from the output end of the voltage conversion module 1 when the output end voltage of the voltage conversion module 1 does not meet the power supply abnormality condition.

[0040] As an example, when the output voltage of the voltage conversion module 1 does not meet the power supply abnormality condition, for example, the output voltage of the voltage conversion module 1 is not less than the output voltage of the uninterruptible power supply module 2, the output voltage of the voltage conversion module 1 is normal, and the first electrical signal is output to the power load 5 and the battery module 22 respectively, so that while power is supplied to the power load 5, a charging circuit is formed between the power management module 21 and the battery module 22 to charge the battery module 22.

[0041] It can be understood that since the output voltage of the voltage conversion module 1 is not less than the output voltage of the uninterruptible power supply module 2 at this time, the battery module 22 will not discharge, but store the electric energy output by the voltage conversion module 1, so that when the output voltage of the voltage conversion module 1 meets the power supply abnormality condition, a discharge loop is formed between the battery module 22 and the power load 5, and the power supply to the power load 5 is automatically switched.

[0042] In this embodiment, the power management module 21 is also used to charge the battery module 22 according to the first electrical signal output from the output end of the voltage conversion module 1 when the output end voltage of the voltage conversion module 1 does not meet the power supply abnormality condition, thereby improving energy utilization and simplifying the cost and occupied area of ​​the uninterruptible power supply module 2.

[0043] In one embodiment, if Figure 2 As shown, the power management module 21 includes a main control module 211, a first switch circuit 212 and a second switch circuit 213; the positive electrode of the battery module 22 is used to connect the voltage conversion module 1 and the power load 5; the first end of the first switch circuit 212 is connected to the negative electrode of the battery module 22, and the second end of the first switch circuit 212 is used to connect the voltage conversion module 1; the first end of the second switch circuit 213 is connected to the negative electrode of the battery module 22, and the second end of the second switch circuit 213 is used to connect the power load 5; the main control module 211 is connected to the voltage conversion module 1, the battery module 22, the first switch circuit 212 and the second switch circuit 213, and is used to collect battery information of the battery module 22, and control the first switch circuit 212 and the second switch circuit 213 to work according to the battery information, so that when the output terminal voltage of the voltage conversion module 1 meets the power supply abnormality condition, the power supply to the power load 5 is supplied through the battery module 22, and when the output terminal voltage of the voltage conversion module 1 does not meet the power supply abnormality condition, the battery module 22 is charged according to the first electrical signal output from the output terminal of the voltage conversion module 1.

[0044] As an example, the first switch circuit 212 includes a first switch tube, and the second switch circuit 213 includes a second switch tube. Optionally, the first switch tube and the second switch tube may be field effect transistors.

[0045] Exemplarily, the drain of the first switch tube is connected to the negative electrode of the battery module 22, the source of the first switch tube is connected to the voltage conversion module 1, and the gate of the first switch tube is connected to the main control module 211. The source of the second switch tube is connected to the negative electrode of the battery module 22, the drain of the second switch tube is connected to the power load 5, and the gate of the second switch tube is connected to the main control module 211. Exemplarily, the main control module 211 is connected to the first switch tube and the second switch tube through the first connection terminal K1 and the second connection terminal K2 respectively.

[0046] As an example, the main control module 211 collects battery information of the battery module 22 and controls the operation of the first switch circuit 212 and the second switch circuit 213. For example, the battery information includes battery charging information, battery discharging information, and battery temperature. For example, the battery charging information includes charging current and charging voltage. The battery discharging information includes discharging current and discharging voltage.

[0047] Exemplarily, when the energy storage device is started, the main control module 211 controls the first switch circuit 212 to turn off and the second switch circuit 213 to turn off, and enter the initialization state. After the initialization state is completed, keep the first switch circuit 212 turned off and the second switch circuit 213 turned off to enter the standby state. Then, collect battery information to determine whether there is a charging fault, a discharging fault, and a high temperature risk. For example, based on the charging current and the charging voltage, determine whether there is overcurrent and overvoltage, based on the discharge current and the discharge voltage, determine whether there is overcurrent and undervoltage, and based on the battery temperature, determine whether the safe temperature is exceeded.

[0048] If there is no risk of charging failure, discharging failure and high temperature, the first switch circuit 212 is controlled to be turned off and the second switch circuit 213 is controlled to be turned on, and the system enters a static state. When the output voltage of the voltage conversion module 1 meets the abnormal power supply condition, the power load 5 is powered by the battery module 22. Since the output voltage of the voltage conversion module 1 is less than the output voltage of the battery module 22, the system automatically switches to the battery module 22 to power the power load 5. When the output voltage of the voltage conversion module 1 does not meet the abnormal power supply condition, since the output voltage of the voltage conversion module 1 is not less than the output voltage of the battery module 22, the battery module 22 is charged according to the first electrical signal output from the output of the voltage conversion module 1.

[0049] If there is a charging fault, the main control module 211 controls the first switch circuit 212 to turn off and the second switch circuit 213 to turn on, so as to ensure that the battery module 22 can discharge normally. If there is a discharge fault, the main control module 211 controls the first switch circuit 212 to turn on and the second switch circuit 213 to turn off, so as to ensure that the battery module 22 can charge normally. If there is a high temperature risk, the first switch circuit 212 is turned off and the second switch circuit 213 is turned off to ensure the safety of the energy storage device.

[0050] Preferably, the main control module 211 may also adopt a fuzzy control algorithm according to the battery information to dynamically adjust the charging and discharging of the battery module 22 to ensure the safety of the battery module 22 and improve the charging and discharging efficiency and service life of the battery.

[0051] In this embodiment, the power management module 21 includes a main control module 211, a first switch circuit 212 and a second switch circuit 213; the positive electrode of the battery module 22 is used to connect the voltage conversion module 1 and the power load 5; the first end of the first switch circuit 212 is connected to the negative electrode of the battery module 22, and the second end of the first switch circuit 212 is used to connect the voltage conversion module 1; the first end of the second switch circuit 213 is connected to the negative electrode of the battery module 22, and the second end of the second switch circuit 213 is used to connect the power load 5; the main control module 211, the voltage conversion module 1, the battery module 22, the first switch circuit 212 and the second switch circuit 213 The first switch circuit 212 and the second switch circuit 213 are connected to each other and are used to collect battery information of the battery module 22. According to the battery information, the first switch circuit 212 and the second switch circuit 213 are controlled to operate so that when the output terminal voltage of the voltage conversion module 1 meets the power supply abnormality condition, the power load 5 is powered by the battery module 22. When the output terminal voltage of the voltage conversion module 1 does not meet the power supply abnormality condition, the battery module 22 is charged according to the first electrical signal output from the output terminal of the voltage conversion module 1. Therefore, when the power supply of the voltage conversion module 1 is abnormal, it is automatically and quickly switched to the battery module 22 to power the power load 5, so as to ensure the normal operation of the power load 5 and improve the reliability and stability of the power supply system.

[0052] In one embodiment, the power management module 21 also includes a current limiting module 214; the first end of the current limiting module 214 is connected to the voltage conversion module 1, and the second end of the current limiting module 214 is connected to the second end of the first switch circuit 212, for adjusting the charging current of the battery module 22.

[0053] In this embodiment, the first end of the current limiting module 214 is connected to the voltage conversion module 1, and the second end of the current limiting module 214 is connected to the second end of the first switching circuit 212, which is used to adjust the charging current of the battery module 22, thereby reducing the impact of the charging current and reducing the heat generated by the battery module 22 during charging.

[0054] In one embodiment, the current limiting module 214 includes a first inductor 2141 and a first transistor 2142 ; the first inductor 2141 and the first transistor 2142 are arranged in series between the voltage conversion module 1 and the second end of the first switch circuit 212 .

[0055] As an example, the first end of the first inductor 2141 is connected to the second end of the first switch circuit 212, the second end of the first inductor 2141 is connected to the drain of the first transistor 2142, the source of the first transistor 2142 is connected to the voltage conversion module 1, the gate of the first transistor 2142 is connected to the main control module 211, and the main control module 211 outputs a control signal to the first transistor 2142, so that the first transistor 2142 cooperates with the first inductor 2141 to adjust the charging current of the battery module 22. Exemplarily, the control signal is a PWM (Pulse Width Modulation, PWM for short) signal. In this example, when the main control module 211 detects that the battery module 22 is fully charged, the first transistor 2142 is controlled to be turned off, and the battery module 22 is prohibited from being charged. When the battery module 22 consumes power to the set power, the main control module 211 controls the first transistor 2142 to be turned on, and the battery module 22 continues to be charged, thereby avoiding continuous floating charge of the battery module 22 and effectively extending the service life of the battery module 22. Exemplarily, the main control module 211 is connected to the first transistor 2142 via the third connection terminal K3.

[0056] In this embodiment, the first inductor 2141 and the first transistor 2142 are arranged in series between the voltage conversion module 1 and the second end of the first switching circuit 212. The first transistor 2142 cooperates with the first inductor 2141 to adjust the charging current of the battery module 22, thereby reducing the impact of the charging current and reducing the heat generated by the battery module 22 during charging.

[0057] Furthermore, the current limiting module 214 also includes a freewheeling diode D1, the anode of the freewheeling diode D1 is connected to the connection node between the first inductor 2141 and the first transistor 2142, and the cathode of the freewheeling diode D1 is connected to the battery module 22, which is used for loop freewheeling during the switching process.

[0058] In one embodiment, it includes a first diode 3 and a second diode 4; the cathode of the first diode 3 is coupled to the output end of the voltage conversion module 1, and the anode of the first diode 3 is coupled to the battery module 22; the anode of the second diode 4 is coupled to the battery module 22, and the cathode of the second diode 4 is coupled to the power load 5.

[0059] In this embodiment, the first diode 3 and the second diode 4 are used to realize unidirectional conduction of the power circuit current to prevent the voltage of the power load 5 from flowing back to the battery module 22, so that the charging path and the discharging path of the battery module 22 are isolated from each other, thereby improving the safety of the battery module 22.

[0060] In one embodiment, the power supply system further includes a display module (not shown in the figure) connected to the power management module 21 ; the power management module 21 is used to control the display module to display the SOC information corresponding to the battery module 22 .

[0061] As an example, the power management module 21 estimates the SOC of the battery module 22 according to the battery information by using the coulomb method based on current integration, forms SOC information, and displays the SOC information through the display module, so that the user can observe the use of the battery module 22. Exemplarily, the battery information includes the charge and discharge current of the battery module 22, the battery capacity of the battery module 22, and the charge and discharge time.

[0062] Exemplarily, the Coulomb method formula based on current integration: SOC = SOC_initial + (ΔQ / Q_max) × 100%; Among them, SOC is the current state of charge of the battery module 22, SOC_initial is the initial state of charge of the battery module 22, which is usually set to full charge (100%) or empty charge (0%), ΔQ is the amount of electricity charged or discharged by the battery module 22 in a specific time interval, which is obtained by multiplying the charge and discharge current (I) and the charge and discharge time (t), that is, ΔQ = I *t. Q_max is the battery capacity of the battery module 22, that is, the amount of electricity that the battery module 22 can store when it is fully charged.

[0063] In this embodiment, the power supply system also includes a display module connected to the power management module 21; the power management module 21 is used to control the display module to display the SOC information corresponding to the battery module 22, so that the user can observe the usage of the battery module 22 and improve the user experience.

[0064] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A power supply system, characterized in that: Including voltage conversion module and uninterruptible power supply module; The input end of the voltage conversion module is used to connect to the first power supply end, and the output end of the voltage conversion module is used to connect to the power load; The input end of the uninterruptible power supply module is connected to the output end of the voltage conversion module, and the output end of the uninterruptible power supply module is used to connect the power load. The uninterruptible power supply module is used to supply power to the power load when the output end voltage of the voltage conversion module meets the power supply abnormality condition.

2. The power supply system according to claim 1, characterized in that: The abnormal power supply condition is that the output terminal voltage of the voltage conversion module is lower than the output terminal voltage of the uninterruptible power supply module.

3. The power supply system according to claim 1, characterized in that: The voltage conversion module includes an AC / DC voltage conversion module.

4. The power supply system according to claim 1, characterized in that: The uninterruptible power supply module includes a power management module and a battery module; The battery module is used to connect the voltage conversion module and the power load; The power management module is connected to the voltage conversion module, the power load and the battery module, and is used to supply power to the power load through the battery module when the output terminal voltage of the voltage conversion module meets the power supply abnormality condition.

5. The power supply system according to claim 4, characterized in that: The power management module is further configured to charge the battery module according to a first electrical signal output from the output end of the voltage conversion module when the output end voltage of the voltage conversion module does not satisfy the abnormal power supply condition.

6. The power supply system according to claim 5, characterized in that: The power management module includes a main control module, a first switch circuit and a second switch circuit; The positive electrode of the battery module is used to connect the voltage conversion module and the power load; The first end of the first switch circuit is connected to the negative electrode of the battery module, and the second end of the first switch circuit is used to connect to the voltage conversion module; The first end of the second switch circuit is connected to the negative electrode of the battery module, and the second end of the second switch circuit is used to connect the power load; The main control module is connected to the voltage conversion module, the battery module, the first switch circuit and the second switch circuit. The main control module is used to collect battery information of the battery module, and control the operation of the first switch circuit and the second switch circuit according to the battery information, so that when the output terminal voltage of the voltage conversion module meets the power supply abnormality condition, the power supply to the power load is supplied through the battery module, and when the output terminal voltage of the voltage conversion module does not meet the power supply abnormality condition, the battery module is charged according to the first electrical signal outputted from the output terminal of the voltage conversion module.

7. The power supply system according to claim 6, characterized in that: The power management module also includes a current limiting module; a first end of the current limiting module is connected to the voltage conversion module, and a second end of the current limiting module is connected to the second end of the first switch circuit, for adjusting the charging current of the battery module.

8. The power supply system according to claim 7, characterized in that: The current limiting module includes a first inductor and a first transistor; The first inductor and the first transistor are arranged in series between the voltage conversion module and the second end of the first switch circuit.

9. The power supply system according to claim 4, characterized in that: including a first diode and a second diode; An anode of the first diode is coupled to the output end of the voltage conversion module, and a cathode of the first diode is coupled to the battery module; An anode of the second diode is coupled to the battery module, and a cathode of the second diode is coupled to the power load.

10. The power supply system according to claim 5, characterized in that: It also includes a display module connected to the power management module; the power management module is used to control the display module to display the SOC information corresponding to the battery module.

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