Uninterruptible power supply device

Abstract

The embodiment of the present application provides an uninterrupted power supply device. The uninterrupted power supply device comprises a battery pack, at least two uninterrupted power supplies and a charging module, the charging module is connected with the battery pack, and the battery pack is connected with the at least two uninterrupted power supplies respectively; when the at least two uninterrupted power supplies are normally powered, the charging module charges the battery pack, and the battery pack stops supplying power to the at least two uninterrupted power supplies; when at least one uninterrupted power supply loses power, the charging module stops charging the battery pack, and the battery pack supplies power to the uninterrupted power supply losing power. In the embodiment of the present application, at least two uninterrupted power supplies can share the same battery pack, the shared battery pack can ensure normal power supply of the at least two uninterrupted power supplies, therefore, the number of battery packs can be saved, the waste of battery packs can be avoided, and resources can be saved.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to an uninterruptible power supply device. Background Technology

[0002] To improve the reliability of power supply systems, uninterruptible power systems (UPS) are commonly used to power equipment. A UPS is a constant voltage and constant frequency power supply that contains energy storage devices and has an inverter as its main component.

[0003] In existing technologies, to ensure uninterruptible power supply, each uninterruptible power supply is typically equipped with a standard battery pack, which is then used to charge the uninterruptible power supply. However, since the probability of simultaneous power loss on the input sides of different uninterruptible power supplies is relatively small, this method leads to the waste of battery packs. Summary of the Invention

[0004] In view of the above problems, this application proposes an uninterruptible power supply device to solve the problem of battery waste caused by equipping each uninterruptible power supply with a sufficient amount of battery pack according to standard.

[0005] According to one aspect of the embodiments of this application, an uninterruptible power supply device is provided, the device comprising: a battery pack, at least two uninterruptible power supplies and a charging module, wherein the charging module is connected to the battery pack, and the battery pack is respectively connected to the at least two uninterruptible power supplies;

[0006] When both uninterruptible power supplies are functioning normally, the charging module charges the battery pack, and the battery pack stops supplying power to the at least two uninterruptible power supplies.

[0007] When at least one uninterruptible power supply fails, the charging module stops charging the battery pack, and the battery pack supplies power to the failed uninterruptible power supply.

[0008] Optionally, the device further includes a voltage acquisition module and a first switching transistor; the positive terminal of the charging module is connected to the positive terminal of the battery pack, the negative terminal of the charging module is connected to the emitter of the first switching transistor, the collector of the first switching transistor is connected to the negative terminal of the battery pack, the voltage acquisition module is connected to the gate of the first switching transistor, the voltage acquisition module is connected to the negative terminals of the at least two uninterruptible power supplies, and the positive terminal of the battery pack is connected to the positive terminals of the at least two uninterruptible power supplies.

[0009] Optionally, the output voltages of the at least two uninterruptible power supplies (UPS) are input as level signals to the voltage acquisition module; when both UPS are supplying power normally, the voltage acquisition module outputs a high-level signal, which controls the first switching transistor to close, so that the charging module charges the battery pack; when at least one UPS fails, the voltage acquisition module outputs a low-level signal, which controls the first switching transistor to open, so that the charging module stops charging the battery pack.

[0010] Optionally, the first switching transistor is an insulated gate bipolar transistor.

[0011] Optionally, the device further includes the same number of second switching transistors as the uninterruptible power supply (UPS) and the same number of step-down modules as the UPS; the negative terminal of one UPS is connected to the collector of one second switching transistor, the emitter of each second switching transistor is connected to the negative terminal of the battery pack, the gate of one second switching transistor is connected to one of the step-down modules and then to the negative terminal of the battery pack, and the positive terminal of the battery pack is connected to the positive terminals of the at least two UPSs respectively.

[0012] Optionally, for any uninterruptible power supply (UPS), when the UPS is supplying power normally, the second switching transistor connected to the UPS is disconnected, so that the battery pack stops supplying power to the UPS; for any UPS, when the UPS loses power, the second switching transistor connected to the UPS is closed, so that the battery pack supplies power to the UPS.

[0013] Optionally, the second switching transistor is an insulated gate bipolar transistor.

[0014] Optionally, the device further includes the same number of diodes as the uninterruptible power supply, with the positive terminal of each diode connected to the positive terminal of the battery pack, and the negative terminal of one diode connected to the positive terminal of one uninterruptible power supply.

[0015] Optionally, the charging module is powered by the computer room power distribution box.

[0016] Optionally, the charging module may issue a power outage alarm signal when the power supply to the computer room distribution box is disconnected.

[0017] In this embodiment, the uninterruptible power supply device includes: a battery pack, at least two uninterruptible power supplies, and a charging module. The charging module is connected to the battery pack, and the battery pack is connected to each of the at least two uninterruptible power supplies. When both uninterruptible power supplies are supplying power normally, the charging module charges the battery pack, and the battery pack stops supplying power to the at least two uninterruptible power supplies. When at least one uninterruptible power supply fails, the charging module stops charging the battery pack, and the battery pack supplies power to the failed uninterruptible power supply.

[0018] Therefore, in this embodiment of the application, at least two uninterruptible power supplies (UPS) can share the same battery pack. When both UPS are supplying power normally, the charging module charges the battery pack, and the battery pack stops supplying power to the two UPSs. When at least one UPS fails, the charging module stops charging the battery pack, and the battery pack supplies power to the failed UPS. This ensures that the shared battery pack provides normal power to the at least two UPSs, thus saving the number of battery packs, avoiding waste, and conserving resources. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some drawings of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an uninterruptible power supply device according to an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of another uninterruptible power supply device according to an embodiment of this application. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] In this embodiment of the application, in order to solve the problem of battery waste caused by equipping each uninterruptible power supply with a sufficient number of battery packs according to standard in the prior art and using the battery packs to charge the uninterruptible power supply, considering that the possibility of simultaneous power loss on the input side of uninterruptible power supplies powered by different sources is small, if multiple uninterruptible power supplies can share a set of battery packs, the number of battery packs can be reduced, thereby avoiding resource waste and not reducing the reliability of power supply.

[0024] Furthermore, in this embodiment of the application, it is further considered that when multiple uninterruptible power supplies share the same battery pack, the problem of circuit circulating current is likely to occur. It is also possible that the battery pack may be bypassed and one uninterruptible power supply directly supplies power to another uninterruptible power supply. It is also necessary to solve the problem of how to charge the battery pack equally and float charge it.

[0025] This application embodiment designs an uninterruptible power supply device that can solve the above problems, which is described in detail below.

[0026] Reference Figure 1 The diagram shows a schematic of an uninterruptible power supply device according to an embodiment of this application.

[0027] like Figure 1 As shown, the uninterruptible power supply device may include: a battery pack 101, at least two uninterruptible power supplies 102, and a charging module 103.

[0028] The charging module 103 is connected to the battery pack 101, and the battery pack 101 is connected to the at least two uninterruptible power supplies 102. It should be noted that the connection between the charging module 103 and the battery pack 101, and the connection between the battery pack 101 and the at least two uninterruptible power supplies 102, can be a direct connection or a time-dependent connection, which will be discussed in detail in the following embodiments.

[0029] The battery pack 101 is used to supply power to the uninterruptible power supply 102 connected to the battery pack.

[0030] A battery pack refers to a power source composed of multiple batteries connected in series. These batteries can be classified as lead-acid batteries, nickel-metal hydride batteries, etc. In this application embodiment, any applicable battery pack structure can be selected according to the actual situation; this application embodiment does not impose any restrictions on this.

[0031] The uninterruptible power supply 102 is used to supply power to the relevant equipment load.

[0032] An uninterruptible power supply (UPS) is a constant voltage and frequency power supply containing an energy storage device and primarily composed of an inverter. It is mainly used to provide uninterrupted power to single computers, computer network systems, or other power electronic equipment. When the mains power input is normal, the UPS stabilizes the mains power and supplies it to the load; in this state, the UPS acts as an AC mains voltage regulator, while simultaneously charging its internal battery. When the mains power is interrupted (power outage), the UPS immediately uses the energy from its internal battery to continue supplying 220V AC power to the load through an inverter, ensuring the load continues to operate normally and protecting the load's hardware and software from damage. UPS devices typically provide protection against both overvoltage and undervoltage. It ensures that the computer system continues to operate for a period of time after a power outage, allowing users to save data urgently and preventing work disruptions or data loss due to power outages.

[0033] An uninterruptible power supply (UPS) system consists of the following components: main circuit, bypass circuit, battery, and other power input circuits; a rectifier (REC) for AC / DC conversion; an inverter (INV) for DC / AC conversion; an inverter and bypass output switching circuit; and an energy storage battery. The system's voltage regulation function is typically performed by the rectifier, which uses thyristors or high-frequency switching rectifiers. These rectifiers have the ability to control the output amplitude according to changes in the external power supply, ensuring a relatively constant rectified voltage amplitude even when the external power supply changes (and this change meets system requirements). The purification function is performed by the energy storage battery. Because the rectifier cannot eliminate transient pulse interference, the rectified voltage still contains interference pulses. In addition to storing DC energy, the energy storage battery acts like a large-capacity capacitor to the rectifier; its equivalent capacitance is directly proportional to the battery's capacity. Since the voltage across a capacitor cannot change abruptly, the smoothing characteristic of the capacitor eliminates pulse interference, thus providing a purification function, also known as interference shielding. Frequency stabilization is achieved by the converter, and the frequency stability depends on the stability of the converter's oscillation frequency. To facilitate the daily operation and maintenance of the uninterruptible power supply system, a system operating switch, an automatic bypass switch after the host self-tests a fault, and a maintenance bypass switch are designed for control.

[0034] The operation of an uninterruptible power supply (UPS) can be described as follows: When the mains power is normal at 380VAC (380V AC power supply), the DC main circuit has DC voltage, supplying the DC-AC inverter to output a stable 220V or 380VAC AC voltage. Simultaneously, the mains power is rectified and charges the battery. If the mains power is undervoltage or suddenly fails, the battery pack feeds power to the DC circuit through an isolation diode switch. There is no switching time between grid power and battery power. When the battery is about to run out of power, the UPS issues an audible and visual alarm and stops the inverter at the battery's discharge limit, emitting a continuous alarm sound. The UPS also has overload protection. When an overload occurs (e.g., exceeding 150% load), it switches to bypass mode and automatically returns to normal when the load returns to normal. When a severe overload occurs (e.g., exceeding 200% of the rated load), the UPS immediately stops the inverter output and switches to bypass mode; at this time, the upstream input circuit breaker may also trip. Once the fault is cleared, simply turn the switch back on and restart the machine, and the uninterruptible power supply will resume operation.

[0035] The uninterruptible power supply in this application embodiment can be any type of uninterruptible power supply, such as a switching power supply, and this application embodiment does not impose any restrictions on it.

[0036] The charging module 103 is used to charge the battery pack 101.

[0037] The charging module may include a battery pack total voltage acquisition terminal, a rectifier module, a control unit, etc. In this embodiment, any applicable charging module structure can be selected according to actual conditions; this embodiment does not impose any restrictions.

[0038] based on Figure 1 The uninterruptible power supply device shown requires the battery pack 101 to supply power to the depleted uninterruptible power supply 102 when at least one uninterruptible power supply 102 fails. Therefore, on the one hand, the charging module 103 stops charging the battery pack 101 to avoid unnecessary resource output from the charging module 103; on the other hand, the battery pack 101 supplies power to the depleted uninterruptible power supply 102 to ensure that the depleted uninterruptible power supply 102 can be supplied with power in a timely manner, thus preventing the depleted uninterruptible power supply 102 from stopping operation.

[0039] In this embodiment, at least two uninterruptible power supplies (UPS) can share the same battery pack. When both UPS are supplying power normally, the charging module charges the battery pack, and the battery pack stops supplying power to the two UPSs. When at least one UPS fails, the charging module stops charging the battery pack, and the battery pack supplies power to the failed UPS. This ensures that the shared battery pack provides normal power to the at least two UPSs, thus saving the number of battery packs, avoiding waste, and conserving resources.

[0040] In one optional embodiment, the uninterruptible power supply device may further include a voltage acquisition module and a first switching transistor. The positive terminal of the charging module is connected to the positive terminal of the battery pack, the negative terminal of the charging module is connected to the emitter of the first switching transistor, the collector of the first switching transistor is connected to the negative terminal of the battery pack, the voltage acquisition module is connected to the gate of the first switching transistor, the voltage acquisition module is connected to the negative terminals of at least two uninterruptible power supplies, and the positive terminal of the battery pack is connected to the positive terminals of at least two uninterruptible power supplies.

[0041] The output voltages of the at least two uninterruptible power supplies (UPS) are input as level signals to the voltage acquisition module. The voltage acquisition module outputs a corresponding level signal to the gate of the first switching transistor based on the input level signal. When both UPS are functioning normally, they both output high-level signals to the voltage acquisition module. Therefore, the voltage acquisition module also outputs a high-level signal to the gate of the first switching transistor, controlling the first switching transistor to close, thus enabling the charging module to charge the battery pack. When at least one UPS fails, it outputs a low-level signal to the voltage acquisition module. The voltage acquisition module then outputs a low-level signal to the gate of the first switching transistor, controlling the first switching transistor to open, thus stopping the charging module from charging the battery pack.

[0042] By setting up the aforementioned dedicated charging module to charge the battery pack, the charging module can be used to perform equalization charging and float charging of the battery pack, thereby avoiding the problem that other charging methods cannot solve in terms of equalization charging and float charging of the battery pack.

[0043] In one optional embodiment, the uninterruptible power supply device further includes the same number of second switching transistors as the uninterruptible power supply, and the same number of step-down modules as the uninterruptible power supply. Specifically, the negative terminal of one uninterruptible power supply is connected to the collector of one of the second switching transistors, the emitter of each second switching transistor is connected to the negative terminal of the battery pack, the gate of one second switching transistor is connected to one of the step-down modules, and then connected to the negative terminal of the battery pack. That is, the step-down module is connected in series between the gate of the second switching transistor and the negative terminal of the battery pack, and the positive terminal of the battery pack is connected to the positive terminals of at least two uninterruptible power supplies.

[0044] For any uninterruptible power supply (UPS), when the UPS is supplying power normally, the second switching transistor connected to the UPS is disconnected, so that the battery pack stops supplying power to the UPS; for any UPS, when the UPS loses power, the second switching transistor connected to the UPS is closed, so that the battery pack supplies power to the UPS.

[0045] Switching transistors have the same external shape as ordinary transistors. They operate in the cutoff and saturation regions, effectively switching the circuit between open and closed states. Because of their ability to both open and close circuits, they are widely used in various switching circuits, such as commonly used switching power supply circuits, driver circuits, high-frequency oscillation circuits, analog-to-digital converter circuits, pulse circuits, and output circuits.

[0046] The cutoff state (also known as the open state) of a switching transistor is described as follows: When the voltage applied to the emitter of the switching transistor is less than the forward voltage of the PN junction, the base (gate) current is zero, and both the collector and emitter currents are zero. At this point, the switching transistor loses its current amplification function, and the collector and emitter are essentially in an open state, which is the cutoff state of the switching transistor. The characteristic of a switching transistor in the cutoff state is that both the emitter junction and the collector junction are reverse biased.

[0047] The conduction state (i.e., closed state) of a switching transistor is described as follows: When the voltage applied to the emitter junction of the switching transistor is greater than the forward voltage of the PN junction, and when the base (gate) current increases to a certain level, the collector current no longer increases with the increase of the base current, but remains relatively constant near a certain value. At this point, the switching transistor loses its current amplification function, and the voltage between the collector and emitter is very small. The collector and emitter are essentially in the conduction state of a switch, which is the conducting state of the switching transistor. The characteristic of a switching transistor in saturation conduction is that both the emitter and collector junctions are forward biased. The characteristic of a switching transistor in amplification state is that the emitter junction is forward biased, and the collector junction is reverse biased. This is also the principle behind using a voltmeter to test the voltage values ​​of the emitter and collector junctions to determine the operating status of the switching transistor. Switching transistors operate based on the switching characteristics of transistors.

[0048] There are many types of switching transistors. In this embodiment, any applicable type of switching transistor can be selected, and this embodiment does not impose any restrictions on this.

[0049] Considering that the negative electrode output voltage of the battery pack is too high to be directly used as the gate voltage of the second switching diode, this embodiment uses a buck module to step down the voltage of the negative electrode of the battery pack. The voltage after bucking down is then input to the gate of the second switching diode as its gate voltage. Any suitable buck module can be used based on practical experience; this embodiment does not impose any restrictions on this.

[0050] For example, the switching transistor in this embodiment can be an IGBT (Insulated Gate Bipolar Transistor). An IGBT is a composite, fully controllable, voltage-driven power semiconductor device composed of a BJT (Bipolar Junction Transistor) and a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), combining the advantages of the high input impedance of a MOSFET and the low on-state voltage drop of a GTR (Power Bipolar Transistor). GTRs have a low saturation voltage drop and high current density, but require a large drive current; MOSFETs have very low drive power and fast switching speed, but a large on-state voltage drop and low current density. IGBTs combine the advantages of both devices, offering low drive power and a low saturation voltage drop. They are very suitable for applications in converter systems with DC voltages of 600V and above, such as AC motors, frequency converters, switching power supplies, lighting circuits, and traction drives.

[0051] In an N-channel enhancement-mode insulated-gate bipolar transistor (IGBT) structure, the N+ region is called the source region, and the electrode attached to it is called the source (emitter E). The P+ region is called the drain region. The control region of the device is the gate region, and the electrode attached to it is called the gate (gate G). The channel is formed immediately adjacent to the boundary of the gate region. The P-type region (including the P+ and P- regions) between the collector (C) and emitter (E) (where the channel is formed) is called the subchannel region. The P+ region on the other side of the drain region is called the drain injector, a functional region unique to IGBTs. Together with the drain region and the subchannel region, it forms a PNP bipolar transistor, acting as the emitter, injecting holes into the drain to modulate conductivity and reduce the on-state voltage of the device. The electrode attached to the drain injector region is called the drain (collector C).

[0052] The switching function of an IGBT is achieved by applying a forward gate voltage to form a channel, providing base current to the PNP transistor and turning the IGBT on. Conversely, applying a reverse gate voltage eliminates the channel, cutting off the base current and turning the IGBT off. The driving method of an IGBT is basically the same as that of a MOSFET, only requiring control of the input N-channel MOSFET, thus exhibiting high input impedance characteristics. After the MOSFET channel is formed, holes (minority carriers) are injected from the P+ base into the N-layer, modulating the conductivity of the N-layer, reducing its resistance, and enabling the IGBT to have a low on-state voltage even at high voltages.

[0053] In one alternative embodiment, the device further includes the same number of diodes as the uninterruptible power supply (UPS), with the anode of each diode connected to the anode of the battery pack and the cathode of one diode connected to the anode of one UPS. By using diodes, current can be prevented from flowing out of the anode of the UPS, thereby avoiding circuit circulation problems and preventing direct power supply from one UPS to another.

[0054] A diode, in electronic components, is a device with two electrodes that allows current to flow in only one direction. Many applications utilize its rectification function. Varactor diodes, on the other hand, are used as electronically adjustable capacitors. The directional current characteristic of most diodes is commonly referred to as their rectification function. The most common function of a diode is to allow current to flow in only one direction (called forward bias) and block it in the opposite direction (called reverse bias). Therefore, a diode can be thought of as an electronic check valve. However, in reality, diodes do not exhibit such perfect on / off directionality; instead, they possess more complex nonlinear electronic characteristics, determined by specific diode technologies. Besides being used as switches, diodes have many other functions.

[0055] A diode, also known as a crystal diode, is an electronic device that conducts current in one direction only. Inside a semiconductor diode is a PN junction with two leads. This type of electronic device exhibits unidirectional current conduction depending on the direction of the applied voltage. Generally speaking, a crystal diode is a PN junction interface formed by sintering P-type and N-type semiconductors. A space charge layer forms on both sides of this interface, creating a built-in electric field. When the applied voltage is zero, the diffusion current caused by the concentration difference of charge carriers on both sides of the PN junction and the drift current caused by the built-in electric field are equal, resulting in an electrical equilibrium state. This is the normal characteristic of a diode.

[0056] A diode exhibits forward bias. When a forward voltage is applied, in the initial part of the forward characteristic, the forward voltage is very small and insufficient to overcome the blocking effect of the electric field within the PN junction, resulting in almost zero forward current. This section is called the dead zone. This forward voltage that prevents the diode from conducting is called the dead zone voltage. When the forward voltage exceeds the dead zone voltage, the electric field within the PN junction is overcome, the diode conducts, and the current rises rapidly with increasing voltage. Within the normal operating current range, the diode's terminal voltage remains almost constant during conduction; this voltage is called the diode's forward voltage.

[0057] Diodes exhibit reverse polarity. When the applied reverse voltage does not exceed a certain range, the current flowing through the diode is a reverse current formed by the drift motion of minority carriers. Because the reverse current is very small, the diode is in the off state. This reverse current is also called the reverse saturation current or leakage current, and the reverse saturation current of a diode is greatly affected by temperature.

[0058] Diodes come in many types, and the diodes used in this embodiment can be any applicable type; this embodiment does not impose any restrictions on this.

[0059] In one optional implementation, the charging module is powered by the computer room power distribution box. The charging module uses a non-guaranteed power supply, and issues a power outage alarm signal when the power supply to the computer room power distribution box is disconnected, so as to promptly detect the power outage and take emergency measures.

[0060] Reference Figure 2 The diagram shows another uninterruptible power supply device according to an embodiment of this application.

[0061] It should be noted that, Figure 2 The uninterruptible power supply (UPS) device shown is illustrated using an example of one battery pack connected to two UPSs. However, in practical applications, one battery pack can connect to two or more UPSs. For the specific structure of the UPS device corresponding to other numbers of UPSs, please refer to [reference needed]. Figure 2The specific structure of the uninterruptible power supply device corresponding to the connection of a battery pack and two uninterruptible power supplies shown in the embodiment is not discussed in detail here.

[0062] like Figure 2 As shown, an uninterruptible power supply device may include the following components: a charging module, a battery pack, uninterruptible power supply A, uninterruptible power supply B, a voltage acquisition module, a step-down module A, a step-down module B, a switching transistor Q1, a switching transistor Q2, a switching transistor Q3, a diode D1, and a diode D2.

[0063] In this embodiment, the uninterruptible power supply device may generally include a battery pack charging and discharging circuit and a battery pack charging module. The battery pack charging and discharging circuit may include... Figure 2 The diagram shows an uninterruptible power supply (UPS) A, an uninterruptible power supply (UPS) B, a voltage acquisition module (which may include a battery connection terminal), a step-down module A, a step-down module B, a first switching transistor Q1, a second switching transistor Q2, a second switching transistor Q3, a diode D1, and a diode D2. The battery pack charging module can be... Figure 2 The charging module shown may specifically include a battery pack total voltage acquisition terminal, a rectifier module, and a control unit.

[0064] For example, such as Figure 2 As shown, the positive terminal of the charging module is connected to the positive terminal of the battery pack, the negative terminal of the charging module is connected to the emitter of the switching transistor Q1, the collector of the switching transistor Q1 is connected to the negative terminal of the battery pack, the voltage acquisition module is connected to the gate of the switching transistor Q1, and the voltage acquisition module is connected to the negative terminals of both the uninterruptible power supply A and the uninterruptible power supply B. The positive terminal of the battery pack is connected to the positive terminals of both the uninterruptible power supply A and the uninterruptible power supply B. All components can be connected via wires.

[0065] In the circuit described above, the output voltage of the uninterruptible power supply A and the output voltage of the uninterruptible power supply B are used as high-level or low-level signals and input to the voltage acquisition module. The voltage acquisition module outputs a high-level or low-level signal to the gate of the switching transistor Q1 based on the input high-level or low-level signal, thereby controlling the closing or opening of the switching transistor Q1, and thus controlling the charging module to charge or stop charging the battery pack.

[0066] When the uninterruptible power supply A is supplying power normally, its output voltage is input as a high-level signal to the voltage acquisition module. When the uninterruptible power supply B is supplying power normally, its output voltage is input as a high-level signal to the voltage acquisition module. In this case, both inputs of the voltage acquisition module are high-level signals. Therefore, the voltage acquisition module will output a high-level signal to the gate of the switching transistor Q1, and control the switching transistor Q1 to close through the high-level signal. After the switching transistor Q1 is closed, the charging module will charge the battery pack.

[0067] When the uninterruptible power supply A is supplying power normally, its output voltage is input to the voltage acquisition module as a high-level signal. When the uninterruptible power supply B loses power, its output voltage is input to the voltage acquisition module as a low-level signal. In this case, one of the two inputs of the voltage acquisition module is a high-level signal and the other is a low-level signal. Therefore, the voltage acquisition module will output a low-level signal to the gate of the switching transistor Q1, and control the switching transistor Q1 to turn off through the low-level signal. After the switching transistor Q1 turns off, the charging module will stop charging the battery pack.

[0068] When the uninterruptible power supply A loses power, its output voltage is input as a low-level signal to the voltage acquisition module. When the uninterruptible power supply B is supplying power normally, its output voltage is input as a high-level signal to the voltage acquisition module. In this case, one of the two inputs of the voltage acquisition module is a high-level signal and the other is a low-level signal. Therefore, the voltage acquisition module will output a low-level signal to the gate of the switching transistor Q1, and control the switching transistor Q1 to turn off through the low-level signal. After the switching transistor Q1 turns off, the charging module will stop charging the battery pack.

[0069] For example, such as Figure 2As shown, the negative terminal of the uninterruptible power supply A is connected to the collector of the switching transistor Q2, the emitter of the switching transistor Q2 is connected to the negative terminal of the battery pack, the gate of the switching transistor Q2 is connected to one end of the buck module A, the other end of the buck module A is connected to the negative terminal of the battery pack, the positive terminal of the battery pack is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the positive terminal of the uninterruptible power supply A. Similarly, the negative terminal of the uninterruptible power supply B is connected to the collector of the switching transistor Q3, the emitter of the switching transistor Q3 is connected to the negative terminal of the battery pack, the gate of the switching transistor Q3 is connected to one end of the buck module B, the other end of the buck module B is connected to the negative terminal of the battery pack, the positive terminal of the battery pack is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the positive terminal of the uninterruptible power supply B. All components can be connected via wires.

[0070] In the aforementioned circuit section, when a certain uninterruptible power supply is supplying power normally, the circuit corresponding to that uninterruptible power supply is disconnected, that is, the switching transistor connected to that uninterruptible power supply is disconnected, and the battery pack stops supplying power to that uninterruptible power supply; when a certain uninterruptible power supply loses power, the circuit corresponding to that uninterruptible power supply is closed, that is, the switching transistor connected to that uninterruptible power supply is closed, and the battery pack starts supplying power to that uninterruptible power supply.

[0071] When the uninterruptible power supply A is supplying power normally, the emitter voltage of the switching transistor Q2 will be higher than the collector voltage. In this case, the switching transistor Q2 will not conduct, that is, the switching transistor Q2 will be turned off, thereby causing the battery pack to stop supplying power to the uninterruptible power supply A.

[0072] When the uninterruptible power supply A loses power, the collector voltage of the switching transistor Q2 is 0, the emitter voltage of the switching transistor Q2 is approximately -54V, and the gate voltage of the switching transistor Q2 is approximately -40V after the negative voltage of the battery pack is stepped down by the step-down module A. At this time, the gate-emitter voltage UGE of the switching transistor Q2 is approximately 15V. Therefore, the switching transistor Q2 is turned on, and the battery pack supplies power to the uninterruptible power supply A.

[0073] When the uninterruptible power supply B is supplying power normally, the emitter voltage of the switching transistor Q3 will be higher than the collector voltage. In this case, the switching transistor Q3 will not conduct, that is, the switching transistor Q3 will be turned off, thereby causing the battery pack to stop supplying power to the uninterruptible power supply B.

[0074] When the uninterruptible power supply B loses power, the collector voltage of the switching transistor Q3 is 0, the emitter voltage of the switching transistor Q3 is approximately -54V, and the gate voltage of the switching transistor Q3 is approximately -40V after the negative voltage of the battery pack is stepped down by the buck module B. At this time, the gate-emitter voltage UGE of the switching transistor Q3 is approximately 15V. Therefore, the switching transistor Q3 is turned on, and the battery pack supplies power to the uninterruptible power supply B.

[0075] In the circuit section described above, by setting up diode D1 and loss diode D2, current can be prevented from flowing out of the positive terminal of the uninterruptible power supply, thereby preventing the uninterruptible power supply A and the uninterruptible power supply B from having circuit circulating current problems and preventing one uninterruptible power supply from directly supplying power to the other.

[0076] In this embodiment, at least two uninterruptible power supplies (UPS) share a single battery pack. This allows the battery pack to continuously supply power to the failed UPS even after the first UPS fails. When the UPS resumes normal operation, the charging module performs equalization and float charging on the battery pack. Simultaneously, it avoids the problem of circulating current in the UPS circuit. This embodiment employs relatively simple circuitry and control logic, offering strong scalability.

[0077] The various embodiments in this specification are related to each other and are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0078] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0079] Through the above description of the embodiments, those skilled in the art can clearly understand that the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the various embodiments of this application.

[0080] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0081] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0082] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing embodiments, and will not be repeated here.

[0083] In the embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0084] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0085] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0086] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0087] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. In summary, the content of this specification should not be construed as a limitation of this application.

Claims

1. An uninterruptible power supply device, characterized in that, The device includes: a battery pack, at least two uninterruptible power supplies and a charging module, wherein the charging module is connected to the battery pack and the battery pack is connected to the at least two uninterruptible power supplies respectively; When both uninterruptible power supplies are functioning normally, the charging module charges the battery pack, and the battery pack stops supplying power to the at least two uninterruptible power supplies. When at least one uninterruptible power supply fails, the charging module stops charging the battery pack, and the battery pack supplies power to the failed uninterruptible power supply. The device also includes the same number of second switching transistors as the uninterruptible power supply, and the same number of step-down modules as the uninterruptible power supply. The negative terminal of one of the uninterruptible power supplies is connected to the collector of one of the second switching transistors, the emitter of each of the second switching transistors is connected to the negative terminal of the battery pack, the gate of one of the second switching transistors is connected to one of the step-down modules and then to the negative terminal of the battery pack, and the positive terminal of the battery pack is connected to the positive terminals of the at least two uninterruptible power supplies respectively.

2. The apparatus according to claim 1, characterized in that, The device also includes a voltage acquisition module and a first switching transistor; The positive terminal of the charging module is connected to the positive terminal of the battery pack, the negative terminal of the charging module is connected to the emitter of the first switching transistor, the collector of the first switching transistor is connected to the negative terminal of the battery pack, the voltage acquisition module is connected to the gate of the first switching transistor, the voltage acquisition module is connected to the negative terminals of the at least two uninterruptible power supplies, and the positive terminal of the battery pack is connected to the positive terminals of the at least two uninterruptible power supplies.

3. The apparatus according to claim 2, characterized in that, The output voltages of the at least two uninterruptible power supplies are input as level signals to the voltage acquisition module. When both uninterruptible power supplies are operating normally, the voltage acquisition module outputs a high-level signal, which controls the first switching transistor to close, so that the charging module charges the battery pack. When at least one uninterruptible power supply fails, the voltage acquisition module outputs a low-level signal, which controls the first switching transistor to turn off, thereby stopping the charging module from charging the battery pack.

4. The apparatus according to claim 2, characterized in that, The first switching transistor is an insulated gate bipolar transistor.

5. The apparatus according to claim 1, characterized in that, For any uninterruptible power supply, when the uninterruptible power supply is supplying power normally, the second switching transistor connected to the uninterruptible power supply is disconnected, so that the battery pack stops supplying power to the uninterruptible power supply. For any uninterruptible power supply (UPS), when the UPS loses power, the second switching transistor connected to the UPS closes, so that the battery pack supplies power to the UPS.

6. The apparatus according to claim 1, characterized in that, The second switching transistor is an insulated gate bipolar transistor.

7. The apparatus according to claim 1, characterized in that, The device also includes the same number of diodes as the uninterruptible power supply, with the positive terminal of each diode connected to the positive terminal of the battery pack and the negative terminal of each diode connected to the positive terminal of the uninterruptible power supply.

8. The apparatus according to claim 1, characterized in that, The charging module is powered by the power distribution box in the computer room.

9. The apparatus according to claim 8, characterized in that, The charging module issues a power outage alarm signal when the power supply to the computer room distribution box is disconnected.

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