Uninterruptible power supply device

Abstract

The utility model relates to the technical field of circuits, in particular to an uninterruptible power supply device which comprises an inlet wire switch cabinet, a UPS unit, a connecting cable, an STS unit and an output switch cabinet. The output end of the inlet wire switch cabinet is electrically connected with the input end of the output switch cabinet, the input end of the UPS unit and the input end of the STS unit through connecting cables, the output end of the UPS unit is electrically connected with the input end of the STS unit through a connecting cable, and the output end of the STS unit is electrically connected with the input end of the output switch cabinet through a connecting cable. A two-path power supply mode is adopted, voltage stabilization isolation power supply is carried out through the UPS unit under the normal condition, the battery unit is charged at the same time, even if a UPS inverter breaks down, a static switch arranged in the device can be automatically switched to a bypass mode, direct power supply is carried out through a main power supply, it is ensured that power supply is not interrupted, and continuous operation of key loads is guaranteed.

Description

Technical Field

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

[0002] Float glass production is a highly continuous industrial process, characterized by the need for uninterrupted operation of production equipment throughout a kiln cycle. Since downtime of any critical equipment can lead to severe production disruptions and significant economic losses, ensuring the reliability of production equipment and its power supply system is paramount. The consequences of production interruptions are particularly severe when it involves critical components such as the edge-drawing machine, main drive system, DCS control system, and glass cutting system.

[0003] In float glass production, a single point of failure in equipment generally has a limited impact, but a power supply outage can lead to widespread equipment shutdowns, making it impossible to restore normal production in a short time and causing significant losses. Therefore, uninterruptible power supplies (UPS) are traditionally used as backup power to ensure the continuity of power supply to critical equipment. However, existing UPS power supply solutions present a trade-off between reliability and cost-effectiveness.

[0004] When using a single UPS as a backup power source, although a certain degree of power supply stability can be guaranteed, in actual applications the UPS needs to operate online. Once the UPS itself fails, the system cannot automatically switch to the backup power source, resulting in a power outage. When the UPS needs maintenance, it is often impossible to disconnect it without interruption or the disconnection operation is extremely cumbersome. Sometimes it is even necessary to interrupt the power supply to the load to remove the UPS. This process not only affects the continuity of production, but also increases the complexity and risk of maintenance operations.

[0005] While using multiple UPS units in parallel as backup power increases system redundancy, it also leads to a significant increase in costs. Equipment purchase costs, the complexity of the parallel control system, and subsequent maintenance expenses all increase substantially, placing a heavy economic burden on enterprises.

[0006] Furthermore, maintaining an online UPS carries significant risks. Improper operation can lead to UPS shutdown, interrupting power supply to equipment and causing severe production losses. Therefore, businesses urgently need a more economical, efficient, and reliable power supply solution that avoids the reliability issues of a single UPS while reducing the high costs associated with parallel operation of multiple UPS units. Utility Model Content

[0007] This solution provides an uninterruptible power supply (UPS) device that ensures power supply reliability, supports flexible online maintenance, and solves the problem of power outages caused by UPS failures or improper maintenance operations.

[0008] This utility model is achieved through the following technical solution:

[0009] An uninterruptible power supply (UPS) device includes an incoming switch cabinet, a UPS unit, connecting cables, an STS unit, and an output switch cabinet. The input terminals of the incoming switch cabinet are respectively connected to a first transformer and a second transformer. The output terminals of the incoming switch cabinet are electrically connected to the input terminals of the output switch cabinet, the UPS unit, and the STS unit via connecting cables. The output terminal of the UPS unit is electrically connected to the input terminal of the STS unit via connecting cables. The output terminal of the STS unit is electrically connected to the input terminal of the output switch cabinet via connecting cables.

[0010] Furthermore, it also includes a battery unit, which is electrically connected to the input terminal of the UPS unit via a connecting cable.

[0011] Furthermore, the incoming line switch cabinet includes a first incoming line switch, a second incoming line switch, a third incoming line switch, and a fourth incoming line switch. One end of the first incoming line switch, one end of the second incoming line switch, and one end of the third incoming line switch are all connected to the output terminal of the first transformer. One end of the fourth incoming line switch is connected to the output terminal of the second transformer. The other end of the first incoming line switch is connected to the input terminal of the output switch cabinet. The other ends of the second incoming line switch and the third incoming line switch are respectively connected to the input terminal of the UPS unit. The other end of the fourth incoming line switch is connected to the input terminal of the STS unit.

[0012] Furthermore, the UPS unit includes a bypass input and a rectifier input. The bypass input includes a second switching switch. The rectifier input includes a rectifier, an inverter, a transformer, a first anti-parallel diode, a second anti-parallel diode, and a first switching switch. One end of the second switching switch is connected to the other end of a second input switch and one end of the second anti-parallel diode. The other end of the second switching switch is connected to the input terminal of the STS unit. The input terminal of the rectifier is connected to the other end of a third input switch. The output terminal of the rectifier is connected to the input terminal of the inverter. The battery unit is connected to the input terminal of the inverter. The output terminal of the inverter is connected to one end of the transformer. The other end of the transformer is connected to one end of the first anti-parallel diode. The other end of the first anti-parallel diode is connected to the first switching switch. The other end of the first switching switch is connected to the input terminal of the STS unit.

[0013] Furthermore, the STS unit includes a first static switching switch, a second static switching switch, a bypass combination switch, a third reverse parallel diode, and a fourth reverse parallel diode. One end of the third reverse parallel diode is connected to the other end of the first switching switch and the other end of the second switching switch, respectively. One end of the fourth reverse parallel diode is connected to the other end of the fourth incoming line switch. The other ends of the third and fourth reverse parallel diodes are both connected to one end of the second static switching switch, and the other end of the second static switching switch is connected to the input terminal of the output switch cabinet.

[0014] Furthermore, the other ends of the first switching switch and the second switching switch are both connected to one end of the first static switching switch, the other end of the first static switching switch is connected to the input end of the output switch cabinet, and the other end of the fourth incoming switch is connected to one end of the bypass combination switch, the other end of the bypass combination switch is connected to the input end of the output switch cabinet.

[0015] Furthermore, the output switch cabinet includes a system output switch and a system maintenance bypass switch. One end of the system output switch is connected to the other end of the first static switching switch, the other end of the second static switching switch, and the other end of the bypass combination switch. One end of the system maintenance bypass switch is connected to the other end of the first incoming switch. The other ends of the system output switch and the other ends of the system maintenance bypass switch are both connected to the load.

[0016] Beneficial effects:

[0017] (1) The uninterruptible power supply device proposed in this utility model adopts a dual power supply mode. Under normal circumstances, it is powered by the UPS unit for voltage stabilization and isolation, and charges the battery unit at the same time. Even if the UPS inverter fails, the static switch built into the device can automatically switch to the bypass mode and directly supply power through the main power supply to ensure uninterrupted power supply and ensure the continuous operation of critical loads.

[0018] (2) The uninterruptible power supply device proposed in this utility model can switch to the backup power supply in less than 15ms when the transformer is detected to be de-energized or the UPS is completely de-energized and has no output. Since the switching time is shorter than the threshold of the critical equipment, the equipment will not experience a sudden stop or power failure during the whole process, which effectively prevents the interruption of the float glass production line.

[0019] (3) The uninterruptible power supply device proposed in this utility model can disconnect the UPS output when the UPS unit needs to be repaired, and the device automatically switches to the backup power supply to achieve uninterrupted maintenance. For the maintenance of the STS unit, this solution provides hardware redundancy control and manual bypass switch, so that the power supply can be seamlessly switched during maintenance, further reducing the maintenance risk.

[0020] (4) The uninterruptible power supply device proposed in this utility model, compared with the traditional multi-UPS parallel power supply scheme, reduces the overall cost while ensuring high reliability. Through automatic switching and hardware redundancy design, it achieves a balance between economy and system stability, which meets the needs of enterprises for cost reduction and efficiency improvement. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an electrical connection diagram of an uninterruptible power supply device proposed in this utility model;

[0023] In the diagram, 1-incoming switch cabinet, 2-UPS unit, 3-connecting cable, 4-STS unit, 5-output switch cabinet, 6-battery unit. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0025] Example 1

[0026] refer to Figure 1 An uninterruptible power supply device includes an incoming switch cabinet 1, a UPS unit 2, a connecting cable 3, an STS unit 4, an output switch cabinet 5, and a battery unit 6.

[0027] The incoming line switch cabinet 1 includes a first incoming line switch QL1, a second incoming line switch QL2, a third incoming line switch QL3, and a fourth incoming line switch QL4;

[0028] UPS unit 2 includes a bypass input and a rectifier input. The bypass input includes a second switching switch Q2, and the rectifier input includes a rectifier, an inverter, a transformer, a first anti-parallel diode D1, a second anti-parallel diode D2, and a first switching switch Q1.

[0029] STS unit 4 includes a first static switching switch K1, a second static switching switch K2, a bypass combination switch Q3, a third reverse parallel diode D3, and a fourth reverse parallel diode D4;

[0030] The output switch cabinet 5 includes a system output switch QF1 and a system maintenance bypass switch QF2;

[0031] The battery unit 6 includes a battery and a DC switch QZ1;

[0032] One end of the first incoming line switch QL1, one end of the second incoming line switch QL2, and one end of the third incoming line switch QL3 are all connected to the output terminal of the first transformer #1. One end of the fourth incoming line switch QL4 is connected to the output terminal of the second transformer #2. The other end of the first incoming line switch QL1 is connected to one end of the system maintenance bypass switch QF2 of the output switch cabinet 5. The other ends of the second incoming line switch QL2 and the third incoming line switch QL3 are respectively connected to the input terminal of the UPS unit 2. The other end of the fourth incoming line switch QL4 is connected to the input terminal of the STS unit 4. The second switching switch... One end of Q2 is connected to the other end of the second input switch QL2 and one end of the second anti-parallel diode D2. The other end of the second switching switch Q2 is connected to the input terminal of STS unit 4. The input terminal of the rectifier is connected to the other end of the third input switch QL3. The output terminal of the rectifier is connected to the input terminal of the inverter. One end of the DC switch of battery unit 6 is connected to the rectifier and the inverter respectively. The other end of the DC switch is connected to the battery. The output terminal of the inverter is connected to one end of the transformer. The other end of the transformer is connected to one end of the first anti-parallel diode D1. The other end of the first anti-parallel diode D1 is connected to the first... The first switching switch Q1 is connected to the input terminal of STS unit 4 at one end. One end of the third anti-parallel diode D3 is connected to the other ends of the first switching switch Q1 and the second switching switch Q2. One end of the fourth anti-parallel diode D4 is connected to the other end of the fourth input switch QL4. The other ends of the third and fourth anti-parallel diodes D3 and D4 are both connected to one end of the second static switching switch K2. The other end of the second static switching switch K2 is connected to the input terminal of the output switch cabinet 5. The other end of the first switching switch Q1 and the second... The other end of the switching switch Q2 is connected to one end of the first static switching switch K1. The other end of the first static switching switch K1 is connected to the input end of the output switch cabinet 5. The other end of the fourth incoming switch QL4 is connected to one end of the bypass combination switch Q3. The other end of the bypass combination switch Q3 is connected to the input end of the output switch cabinet 5. One end of the system output switch QF1 is connected to the other end of the first static switching switch K1, the other end of the second static switching switch K2, and the other end of the bypass combination switch Q3. The other ends of the system output switch QF1 and the system maintenance bypass switch QF2 are all connected to the load.

[0033] Example 2

[0034] This embodiment, based on Embodiment 1, proposes a specific working principle for an uninterruptible power supply device.

[0035] refer to Figure 1The uninterruptible power supply device of this application achieves high-reliability uninterrupted power supply to critical loads through multi-channel power supply switching, UPS redundancy design and static switching switch module, and is applied to float glass production lines.

[0036] The specific process includes: Under normal power supply conditions, incoming switches QL1-QL4 are all closed, system output switch QF1 is closed as the output path, system maintenance bypass switch QF2 is open as the backup path, the first switching switch Q1 in UPS unit 2 is closed, the second switching switch Q2 is open, and power enters UPS unit 2 from the third incoming switch QL3. After rectification and inversion, the power is stabilized and isolated for output, and then supplied to the load via the system output switch QF1 of STS unit 4 and output switch cabinet 5. At the same time, the UPS rectifier charges battery unit 6. When the UPS inverter fails, power enters UPS unit 2 from the second incoming switch QL2. The power path changes to the second incoming switch QL2 to the UPS bypass input, to input 1 of STS unit 4, to the system output switch QF1, and finally to the load. The power supply is uninterrupted throughout the process, and a UPS fault alarm is issued.

[0037] When the power supply of transformer #1 is abnormal or there is a power outage, UPS unit 2 supplies power through the battery power inverter. The power path is from battery unit 6 to inverter to input 1 of STS unit 4 to system output switch QF1 and finally to the load, and a power abnormality alarm is issued.

[0038] If the UPS has no output and STS unit 4 detects an abnormal power supply to input 1, STS unit 4 will automatically switch the power supply to input 2 through static switch synchronous coupling. The power path is from the fourth incoming switch QL4 to input 2 of STS unit 4 to the system output switch QF1 and finally to the load. The switching time does not exceed 15ms, ensuring uninterrupted power supply and issuing a power switching alarm to remind maintenance personnel to perform timely maintenance.

[0039] When UPS unit 2 needs to be inspected and maintained, the first UPS switching switch Q1 can be disconnected first to shut down the UPS for maintenance. At this time, STS unit 4 will automatically switch to input 2 after detecting that input 1 is de-energized, so that the load power supply is not interrupted.

[0040] When STS unit 4 requires maintenance, first switch the UPS to bypass mode, close the system maintenance bypass switch QF2, and then disconnect the system output switch QF1 to achieve the switching operation of closing first and then opening, ensuring continuous power supply.

[0041] STS unit 4 employs hardware redundancy control, resulting in an extremely low failure rate. It is also equipped with a manual bypass combination switch Q3, which can switch to bypass power supply when necessary, ensuring the safe maintenance of STS unit 4.

[0042] After repeated testing, the device did not experience any power outages during load operation. It can continuously supply power to the load when either of the two power supply paths is running stably, avoiding the instability risks of a single power supply path. This achieves flexibility and stability in online maintenance and effectively improves the power supply reliability and operating efficiency of the float glass production line.

[0043] This embodiment includes:

[0044] The device has a dual-input power path, in which the device is connected to two different transformers. Transformer #1 is connected to QL1, QL2, and QL3, while transformer #2 is connected to QL4, providing redundant power supply to the system. This ensures that if one power source, such as transformer #1, fails, transformer #2 on the other side can immediately take over the power supply.

[0045] The protection and isolation provided by the parallel diodes: the reverse parallel diodes D1, D2, D3, and D4 are used to prevent current backflow and ensure the independence of each power supply path. D1 and D2 are used to protect the input paths of the first switching switch Q1 and the second switching switch Q2, respectively, to prevent current interference between different paths. The presence of the diodes can also avoid the inrush current generated during the STS switching process and improve the stability of system operation.

[0046] The device features a multi-static switching design, with a first static switching switch K1 and a second static switching switch K2, each responsible for controlling the input and output of different paths. When one power path fails, the STS will quickly switch via static switches based on the detected status signal. The redundancy of K1 and K2 ensures that even if one switching switch fails, the other switch can still ensure continuous power supply to the load.

[0047] The fast switching mechanism ensures that the power supply will not be interrupted even if an abnormal switching occurs, as the coupling time of the static switch is less than 15ms. The efficient switching time relies on the synchronous control and redundant design of the hardware circuit to ensure that there are no interruptions or power outages during the operation of the load.

[0048] The redundant design of the manual bypass switch Q3 and the setting of the bypass combination switch Q3 provide additional safety protection. When STS unit 4 needs to be maintained, the operator can manually switch to the Q3 bypass power supply mode to ensure that the load power supply is not interrupted during maintenance.

[0049] The automatic detection and alarm system (STS) will immediately issue an alarm and automatically switch to the backup power supply when a fault occurs in a certain path, such as a UPS inverter failure or transformer power outage. The switching of Q1 and Q2 and the synchronous operation of the STS enable the system to respond quickly in the event of an anomaly, thereby ensuring the continuity of power supply.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An uninterruptible power supply device, characterized in that, The system includes an incoming switch cabinet, a UPS unit, connecting cables, an STS unit, and an output switch cabinet. The input terminals of the incoming switch cabinet are connected to a first transformer and a second transformer, respectively. The output terminals of the incoming switch cabinet are electrically connected to the input terminals of the output switch cabinet, the UPS unit, and the STS unit, respectively, via connecting cables. The output terminal of the UPS unit is electrically connected to the input terminal of the STS unit via connecting cables. The output terminal of the STS unit is electrically connected to the input terminal of the output switch cabinet via connecting cables.

2. The uninterruptible power supply device according to claim 1, characterized in that, It also includes a battery unit, which is electrically connected to the input of the UPS unit via a connecting cable.

3. The uninterruptible power supply device according to claim 1, characterized in that, The incoming line switch cabinet includes a first incoming line switch, a second incoming line switch, a third incoming line switch, and a fourth incoming line switch. One end of the first incoming line switch, one end of the second incoming line switch, and one end of the third incoming line switch are all connected to the output terminal of the first transformer. One end of the fourth incoming line switch is connected to the output terminal of the second transformer. The other end of the first incoming line switch is connected to the input terminal of the output switch cabinet. The other ends of the second incoming line switch and the third incoming line switch are respectively connected to the input terminal of the UPS unit. The other end of the fourth incoming line switch is connected to the input terminal of the STS unit.

4. The uninterruptible power supply device according to claim 1, characterized in that, The UPS unit includes a bypass input and a rectifier input. The bypass input includes a second switching switch. The rectifier input includes a rectifier, an inverter, a transformer, a first anti-parallel diode, a second anti-parallel diode, and a first switching switch. One end of the second switching switch is connected to the other end of a second input switch and one end of the second anti-parallel diode. The other end of the second switching switch is connected to the input terminal of the STS unit. The input terminal of the rectifier is connected to the other end of a third input switch. The output terminal of the rectifier is connected to the input terminal of the inverter. The battery unit is connected to the input terminal of the inverter. The output terminal of the inverter is connected to one end of the transformer. The other end of the transformer is connected to one end of the first anti-parallel diode. The other end of the first anti-parallel diode is connected to the first switching switch. The other end of the first switching switch is connected to the input terminal of the STS unit.

5. The uninterruptible power supply device according to claim 1, characterized in that, The STS unit includes a first static switching switch, a second static switching switch, a bypass combination switch, a third reverse parallel diode, and a fourth reverse parallel diode. One end of the third reverse parallel diode is connected to the other end of the first switching switch and the other end of the second switching switch, respectively. One end of the fourth reverse parallel diode is connected to the other end of the fourth incoming switch. The other ends of the third and fourth reverse parallel diodes are both connected to one end of the second static switching switch. The other end of the second static switching switch is connected to the input terminal of the output switch cabinet.

6. The uninterruptible power supply device according to claim 5, characterized in that, The other ends of the first switching switch and the second switching switch are both connected to one end of the first static switching switch. The other end of the first static switching switch is connected to the input end of the output switch cabinet. The other end of the fourth incoming switch is connected to one end of the bypass combination switch. The other end of the bypass combination switch is connected to the input end of the output switch cabinet.

7. An uninterruptible power supply device according to claim 6, characterized in that, The output switch cabinet includes a system output switch and a system maintenance bypass switch. One end of the system output switch is connected to the other end of the first static switching switch, the other end of the second static switching switch, and the other end of the bypass combination switch. One end of the system maintenance bypass switch is connected to the other end of the first incoming switch. The other ends of the system output switch and the other ends of the system maintenance bypass switch are both connected to the load.

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