Power supply switching circuit and device based on double input power supplies and double UPS (Uninterrupted Power Supply)

Abstract

The utility model provides a power supply switching circuit and device based on double input power supplies and double UPSs (Uninterrupted Power Supply). The power supply switching circuit comprises a first external power supply input end, a second external power supply input end, an air switch K1, an air switch K2, an uninterruptible power supply UPS A, an uninterruptible power supply UPS B, a first alternating current contactor, a second alternating current contactor, a third alternating current contactor, a fourth alternating current contactor and the like. The power supply switching device comprises the power supply switching circuit based on the double input power supplies and the double UPSs and further comprises a guide rail and a supporting plate installed on the guide rail. And the first alternating current contactor, the second alternating current contactor, the third alternating current contactor, the fourth alternating current contactor, the first external power supply input end, the second external power supply input end and the output end of the power supply switching circuit are respectively arranged on the supporting plate. Therefore, the utility model has the characteristics of high reliability, high stability, low switching delay, low cost and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of weak current control. Specifically, it relates to a power supply switching circuit and device based on dual input power supplies and dual UPSs. Background Technique

[0002] In the field of industrial weak current control, to ensure continuous and stable power supply for subsequent power-consuming equipment, redundant switching of multiple alternating currents is often required. The commonly used methods on the market are small relays and single-chip microcontroller control to achieve power supply switching. For example, the Chinese patent with the application number 202323165642.0 discloses a control device for UPS power supply switching. The controllable switch of the mains switching circuit is set as a dual-control structure with an electromagnetic relay and a solid-state relay in parallel. It should be noted that although such solutions can meet most power supply switching scenarios, in an uninterruptible operation system, power supply switching does not occur frequently, and the switching device operates in an uninterruptible manner. In this working condition, small relays are prone to faults such as node adhesion, overheating, and damage to the single-chip microcontroller, resulting in the failure of the redundant switching function and further causing the subsequent equipment to crash.

[0003] Although the Chinese patent with the application number CN201310723213.2 discloses a redundant AC power supply automatic switching device, which includes two UPSs and three AC contactors. When UPS A is normal, it is powered by UPS A. When UPS A fails and UPS B is normal, it is powered by UPS B. When both UPS A and UPS B fail, it is powered by an external power supply. However, since there is only one external power supply, in the event of failures of both two UPSs and the external power supply, there is a lack of a switching circuit for other backup power supplies, resulting in its inability to continue powering the subsequent equipment in such extreme situations.

[0004] In order to solve the above existing problems, people have been seeking an ideal technical solution. Summary of the Invention

[0005] The purpose of the utility model is to address the deficiencies of the prior art and thus provide a power supply switching circuit and device based on dual input power supplies and dual UPSs.

[0006] To achieve the above purpose, in the first aspect of the utility model, a power supply switching circuit based on dual input power supplies and dual UPSs is provided. It includes a first external power input terminal, a second external power input terminal, air switch K1, air switch K2, uninterruptible power supply UPS A, uninterruptible power supply UPS B, first AC contactor, second AC contactor, third AC contactor, and fourth AC contactor. Among them,

[0007] The first external power input terminal is respectively connected to the input terminal of the uninterruptible power supply UPS A and one end of the normally open contact in the first AC contactor through the air switch K1;

[0008] The second external power input terminal is respectively connected to the input terminal of the uninterruptible power supply UPS B and one end of the normally closed contact in the first AC contactor through the air switch K2;

[0009] The output terminal of the uninterruptible power supply UPS A is connected to one end of the normally open contact in the second AC contactor, and the output terminal of the uninterruptible power supply UPS B is connected to one end of the normally closed contact in the second AC contactor; the other end of the normally open contact in the second AC contactor is respectively connected to one end of the normally open contact in the third AC contactor and one end of the normally open contact in the fourth AC contactor, and the other end of the normally closed contact in the second AC contactor is connected to one end of the normally open contact in the third AC contactor;

[0010] The other end of the normally open contact in the first AC contactor and the other end of the normally closed contact in the first AC contactor are respectively connected to one end of the normally closed contact in the third AC contactor, and the other end of the normally closed contact in the third AC contactor is connected to one end of the normally closed contact in the fourth AC contactor;

[0011] The other end of the normally open contact in the third AC contactor, the other end of the normally open contact in the fourth AC contactor, and one end of the normally closed contact in the fourth AC contactor all serve as the output terminals of the power supply switching circuit.

[0012] To achieve the above object, in the second aspect of the present invention, a power supply switching device is provided, which includes the above-mentioned power supply switching circuit based on dual input power supplies and dual UPSs, and further includes a guide rail and a support plate mounted on the guide rail; the first AC contactor, the second AC contactor, the third AC contactor, the fourth AC contactor, the first external power input terminal, the second external power input terminal, and the output terminal of the power supply switching circuit are respectively mounted on the support plate.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1) The present invention proposes a power supply switching circuit based on dual input power supplies and dual UPSs. The power supply switching device uses four AC contactors to provide switching circuits corresponding to four power supplies of two external power supplies and two uninterruptible power supplies UPSs, with good redundancy and capable of providing power for subsequent devices in extreme situations;

[0015] 2) The fourth AC contactor serves as a standby AC contactor, which facilitates the subsequent switching of four-way power supplies. After all UPSs fail, it can directly switch to mains power supply to ensure continuous power supply to the subsequent equipment. Description of the Drawings

[0016] Figure 1 is a schematic circuit diagram of the power switching circuit based on dual input power supplies and dual UPSs of the present utility model;

[0017] Figure 2 is a schematic block diagram of the structure of the power switching circuit based on dual input power supplies and dual UPSs of the present utility model;

[0018] Figure 3 is a schematic structural diagram of the power switching device of the present utility model;

[0019] In the figure: 1. First power supply lightning protection circuit; 2. Second power supply lightning protection circuit; 3. First power supply filter; 4. Second power supply filter; 5. First AC contactor; 6. Second AC contactor; 7. Third AC contactor; 8. Fourth AC contactor; 9. Guide rail; 10. Support plate. Detailed Embodiments

[0020] The technical solutions of the present utility model will be further described in detail below through specific embodiments.

[0021] The terms "first", "second", "third", "fourth", etc. in the specification, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing objects with the same attributes when describing the embodiments of this application.

[0022] Embodiment 1

[0023] As shown in the Figure 1 drawings, this embodiment provides a specific implementation of a power switching circuit based on dual input power supplies and dual UPSs;

[0024] The power switching device includes a first external power input terminal, a second external power input terminal, a circuit breaker K1, a circuit breaker K2, an uninterruptible power supply UPS A, an uninterruptible power supply UPS B, a first AC contactor 5, a second AC contactor 6, a third AC contactor 7, and a fourth AC contactor 8, wherein,

[0025] The first external power input terminal is respectively connected to the input terminal of the uninterruptible power supply UPS A and one end of the normally open contact in the first AC contactor 5 through the circuit breaker K1;

[0026] The second external power input terminal is respectively connected to the input terminal of the uninterruptible power supply UPS B and one end of the normally closed contact in the first AC contactor 5 through the air switch K2;

[0027] The output terminal of the uninterruptible power supply UPS A is connected to one end of the normally open contact in the second AC contactor 6, and the output terminal of the uninterruptible power supply UPS B is connected to one end of the normally closed contact in the second AC contactor 6; the other end of the normally open contact in the second AC contactor 6 is respectively connected to one end of the normally open contact in the third AC contactor 7 and one end of the normally open contact in the fourth AC contactor 8, and the other end of the normally closed contact in the second AC contactor 6 is connected to one end of the normally open contact in the third AC contactor 7;

[0028] The other end of the normally open contact in the first AC contactor 5 and the other end of the normally closed contact in the first AC contactor 5 are respectively connected to one end of the normally closed contact in the third AC contactor 7, and the other end of the normally closed contact in the third AC contactor 7 is connected to one end of the normally closed contact in the fourth AC contactor 8;

[0029] The other end of the normally open contact in the third AC contactor 7, the other end of the normally open contact in the fourth AC contactor 8, and one end of the normally closed contact in the fourth AC contactor 8 all serve as the output terminals of this power supply switching circuit.

[0030] It should be noted that this embodiment proposes a power supply switching circuit based on dual-input power supplies and dual UPSs, including four AC contactors, and can provide switching circuits corresponding to four power supplies. Therefore, the present utility model can provide emergency power supplies for subsequent devices through these four switching circuits respectively through the first external power supply, the second external power supply, the uninterruptible power supply UPS A, and the uninterruptible power supply UPS B. When both uninterruptible power supplies UPS fail, the present utility model also provides an external power supply corresponding switching circuit for subsequent devices to use, and can effectively ensure that the subsequent devices are not powered off in extreme situations, with good redundancy.

[0031] It should also be noted that the two mains inputs of the first external power supply and the second external power supply enter the first AC contactor 5, and one is selected for standby after two-way selection (preferably select circuit I); the other two inputs (which can be the outputs of two UPSs or other voltage stabilizing devices) enter the second AC contactor 6, and one is selected for standby after two-way selection (preferably select the output of UPS host A); after the first AC contactor 5 and the second AC contactor 6 are selected, the results enter the third AC contactor 7 and the fourth AC contactor 8, and one is selected for output to subsequent devices (preferably select the UPS output).

[0032] In some embodiments, the driving coil of the first AC contactor 5 is connected to the first external power input terminal, the driving coils of the second AC contactor 6 and the third AC contactor 7 are respectively connected to the uninterruptible power supply UPS A, and the driving coil of the fourth AC contactor 8 is connected to the uninterruptible power supply UPS B.

[0033] It should be noted that as shown in the appendix Figure 2 The first AC contactor 5 is controlled by the first external power supply (external input path I). At this time, the first external power supply is connected to the driving coil of the first AC contactor 5; when the first external power supply is working normally, the driving coil of the first AC contactor 5 is energized, and the actuating iron core in the first AC contactor 5 is attracted by the electromagnetic force, the normally open contact in the first AC contactor 5 closes, and the normally closed contact in the first AC contactor 5 opens;

[0034] The second AC contactor 6 and the third AC contactor 7 are controlled by the uninterruptible power supply UPS A. At this time, the uninterruptible power supply UPS A is respectively connected to the driving coils of the second AC contactor 6 and the third AC contactor 7; when the uninterruptible power supply UPS A is working normally and outputting power, the driving coils of the second AC contactor 6 and the third AC contactor 7 are both energized, and the actuating iron cores of these two AC contactors are attracted by the electromagnetic force, the normally open contact in the second AC contactor 6 closes (the normally closed contact opens), and the normally open contact in the third AC contactor 7 closes (the normally closed contact opens);

[0035] The fourth AC contactor 8 is controlled by the uninterruptible power supply UPS B. At this time, the uninterruptible power supply UPS B is connected to the driving coil of the fourth AC contactor 8; when the uninterruptible power supply UPS B is working normally and outputting power, the driving coil of the fourth AC contactor 8 is energized, and the actuating iron core of the fourth AC contactor 8 is attracted by the electromagnetic force, and the normally open contact in the fourth AC contactor 8 closes (the normally closed contact opens). The fourth AC contactor 8 serves as a waiting AC contactor, which can facilitate the subsequent switching of the four-way power supply. After the first external power supply and the two UPSs fail, it can be directly switched to the second external power supply for power supply to ensure the continuous power supply of the subsequent equipment.

[0036] It should also be noted that when the first external power supply is working normally, the normally open contact in the first AC contactor 5 closes (the normally closed contact opens). At this time, if both the uninterruptible power supply UPS A and the uninterruptible power supply UPS B fail, the first external power supply will supply power to the subsequent equipment; at this time, the voltage flow direction is: the first external power input terminal - the air switch K1 - the normally closed contact in the third AC contactor 7 - the normally closed contact in the fourth AC contactor 8 - the output terminal of the power switching circuit - the subsequent equipment;

[0037] If the uninterruptible power supply UPS A is working properly, the uninterruptible power supply UPS A supplies power to the subsequent devices. At this time, the voltage flow direction is: uninterruptible power supply UPS A - normally open contact (closed at this time) in the second AC contactor 6 - normally open contact (closed at this time) in the third AC contactor 7 - output end of the power supply switching circuit - subsequent devices;

[0038] If the uninterruptible power supply UPS A fails and the uninterruptible power supply UPS B is working properly, the uninterruptible power supply UPS B supplies power to the subsequent devices. At this time, the voltage flow direction is: uninterruptible power supply UPS B - normally closed contact in the second AC contactor 6 - normally open contact (closed at this time) in the fourth AC contactor 8 - output end of the power supply switching circuit - subsequent devices.

[0039] It should also be noted that when the first external power supply fails and the second external power supply is working properly, the normally open contact in the first AC contactor 5 is disconnected (the normally closed contact is closed). At this time, if both the uninterruptible power supply UPS A and the uninterruptible power supply UPS B fail, the second external power supply supplies power to the subsequent devices. At this time, the voltage flow direction is: second external power supply input terminal - air switch K2 - normally closed contact in the first AC contactor 5 - normally closed contact in the third AC contactor 7 - normally closed contact in the fourth AC contactor 8 - output end of the power supply switching circuit - subsequent devices;

[0040] If the uninterruptible power supply UPS A is working properly, the uninterruptible power supply UPS A supplies power to the subsequent devices. At this time, the voltage flow direction is: uninterruptible power supply UPS A - normally open contact (closed at this time) in the second AC contactor 6 - normally open contact (closed at this time) in the third AC contactor 7 - output end of the power supply switching circuit - subsequent devices;

[0041] If the uninterruptible power supply UPS A fails and the uninterruptible power supply UPS B is working properly, the uninterruptible power supply UPS B supplies power to the subsequent devices. At this time, the voltage flow direction is: uninterruptible power supply UPS B - normally closed contact in the second AC contactor 6 - normally open contact (closed at this time) in the fourth AC contactor 8 - output end of the power supply switching circuit - subsequent devices.

[0042] It should also be noted that when both the first external power supply and the second external power supply fail, if the uninterruptible power supply UPS A is working properly, the uninterruptible power supply UPS A supplies power to the subsequent devices. At this time, the voltage flow direction is: uninterruptible power supply UPS A - normally open contact (closed at this time) in the second AC contactor 6 - normally open contact (closed at this time) in the third AC contactor 7 - output end of the power supply switching circuit - subsequent devices;

[0043] If the uninterruptible power supply UPS A fails and the uninterruptible power supply UPS B works normally, the uninterruptible power supply UPS B supplies power to the subsequent devices. At this time, the voltage flow direction is: uninterruptible power supply UPS B - normally closed contact in the second AC contactor 6 - normally open contact in the fourth AC contactor (closed at this time) - output end of the power supply switching circuit - subsequent devices.

[0044] It should also be noted that when the uninterruptible power supply UPS A fails and the uninterruptible power supply UPS B works normally, at this time, due to the normal operation of the uninterruptible power supply UPS B, the normally open contact in the fourth AC contactor 8 closes (the normally closed contact opens), and it is in the waiting output position. The uninterruptible power supply UPS B directly outputs without waiting, thus reducing the switching time and effectively solving the problem of the subsequent devices' intolerance to voltage sag.

[0045] Embodiment 2

[0046] Based on Embodiment 1, this embodiment gives another specific implementation manner of the power supply switching circuit based on dual-input power supplies and dual UPSs;

[0047] In some embodiments, the power supply switching circuit based on dual-input power supplies and dual UPSs further includes a first power supply lightning protection circuit 1, a second power supply lightning protection circuit 2, a first power supply filter 3, and a second power supply filter 4. The input end of the first power supply lightning protection circuit 1 is connected to the air switch K1, the output end of the first power supply lightning protection circuit 1 is connected to the input end of the first power supply filter 3, and the output end of the first power supply filter 3 is respectively connected to the input end of the uninterruptible power supply UPS A and one end of the normally open contact in the first AC contactor 5;

[0048] The input end of the second power supply lightning protection circuit 2 is connected to the air switch K2, the output end of the second power supply lightning protection circuit 2 is connected to the input end of the second power supply filter 4, and the output end of the second power supply filter 4 is respectively connected to the input end of the uninterruptible power supply UPS B and one end of the normally closed contact in the first AC contactor 5.

[0049] Specifically, the circuit structures of the first power supply lightning protection circuit 1 and the second power supply lightning protection circuit 2 are the same, which is used to improve the surge protection ability of the power supply switching circuit, making the power supply switching circuit safer and more reliable. The specific circuit structure is as shown in the appendix Figure 1 and will not be elaborated here.

[0050] Specifically, both the first power supply filter 3 and the second power supply filter 4 adopt AC single-phase low-pass filters, which have the ability to suppress common-mode and differential-mode interference, and can effectively reduce the peak voltage when lightning surge disasters occur.

[0051] Embodiment 3

[0052] Based on the above embodiments, this embodiment provides a specific implementation manner of a power supply switching device, as shown in the attached Figure 3 figure;

[0053] The power supply switching device includes the power supply switching circuit based on dual input power supplies and dual UPSs in Embodiment 1, and further includes a guide rail 9 and a support plate 10 mounted on the guide rail 9. The first AC contactor 5, the second AC contactor 6, the third AC contactor 7, the fourth AC contactor 8, the first external power input terminal, the second external power input terminal and the output terminal of the power supply switching circuit are respectively mounted on the support plate 10.

[0054] It should be noted that the power supply switching circuit based on dual input power supplies and dual UPSs can be used in the power supply devices of existing railway disaster monitoring system monitoring units or existing turnout comprehensive monitoring systems (obtaining the parameters of the combined part of the rail components and the switch machine during the operation of the turnout, and realizing the overall evaluation of the operation state of the turnout), etc. During installation, it can be installed on the housing of the existing power supply device through the guide rail.

[0055] It should also be noted that the power supply switching device has the characteristics of high reliability, high stability, low switching delay (mainly realized by the connection mode of the fourth AC contactor 8), and low cost, and is suitable for the 7*24-hour working mode.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still modifications can be made to the specific implementation manners of the present invention or equivalent replacements can be made to some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered by the scope of the technical solutions claimed in the present invention.

Claims

1. A power supply switching circuit based on a dual-input power supply and dual UPS, characterized in that: Including a first external power input terminal, a second external power input terminal, an air switch K1, an air switch K2, an uninterruptible power supply UPS A, an uninterruptible power supply UPS B, a first AC contactor, a second AC contactor, a third AC contactor, and a fourth AC contactor. Among them, The first external power input terminal is respectively connected to the input terminal of the uninterruptible power supply UPS A and one end of the normally open contact in the first AC contactor through the air switch K1; The second external power input terminal is respectively connected to the input terminal of the uninterruptible power supply UPS B and one end of the normally closed contact in the first AC contactor through the air switch K2; The output terminal of the uninterruptible power supply UPS A is connected to one end of the normally open contact in the second AC contactor, and the output terminal of the uninterruptible power supply UPS B is connected to one end of the normally closed contact in the second AC contactor; The other end of the normally open contact in the second AC contactor is respectively connected to one end of the normally open contact in the third AC contactor and one end of the normally open contact in the fourth AC contactor, and the other end of the normally closed contact in the second AC contactor is connected to one end of the normally open contact in the third AC contactor; The other end of the normally open contact in the first AC contactor and the other end of the normally closed contact in the first AC contactor are respectively connected to one end of the normally closed contact in the third AC contactor, and the other end of the normally closed contact in the third AC contactor is connected to one end of the normally closed contact in the fourth AC contactor; The other end of the normally open contact in the third AC contactor, the other end of the normally open contact in the fourth AC contactor, and one end of the normally closed contact in the fourth AC contactor are all used as the output terminals of this power supply switching circuit.

2. The power supply switching circuit based on a dual-input power supply and dual UPS according to claim 1, wherein: The driving coil of the first AC contactor is connected to the first external power input terminal, the driving coils of the second AC contactor and the third AC contactor are respectively connected to the uninterruptible power supply UPS A, and the driving coil of the fourth AC contactor is connected to the uninterruptible power supply UPS B.

3. The power supply switching circuit based on a dual-input power supply and dual UPS according to claim 1 or 2, characterized in that: It further includes a first power lightning protection circuit, a second power lightning protection circuit, a first power filter, and a second power filter. The input terminal of the first power lightning protection circuit is connected to the air switch K1, the output terminal of the first power lightning protection circuit is connected to the input terminal of the first power filter, and the output terminal of the first power filter is respectively connected to the input terminal of the uninterruptible power supply UPS A and one end of the normally open contact in the first AC contactor; The input terminal of the second power lightning protection circuit is connected to the air switch K2, the output terminal of the second power lightning protection circuit is connected to the input terminal of the second power filter, and the output terminal of the second power filter is respectively connected to the input terminal of the uninterruptible power supply UPS B and one end of the normally closed contact in the first AC contactor.

4. A power switching device, characterized in that: Including the power supply switching circuit based on dual-input power and dual UPS according to any one of claims 1 to 3, further including a guide rail and a support plate installed on the guide rail; The first AC contactor, the second AC contactor, the third AC contactor, the fourth AC contactor, the first external power input terminal, the second external power input terminal and the output terminal of the power supply switching circuit are respectively installed on the support plate.

Images