Low-voltage power supply pressure loss alarm system
By introducing detection, control, and alarm modules into the low-voltage power supply circuit, and using relays and PLC controllers to detect voltage loss or phase loss, and providing light and sound alarms, the problem of lack of voltage loss and phase loss alarms in the low-voltage power supply circuit is solved, enabling rapid fault location and power restoration.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING ZHONGSHI REAL ESTATE MANAGEMENT CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-08-04
AI Technical Summary
The lack of undervoltage and phase loss alarm functions in existing low-voltage power supply circuits makes it impossible for managers to detect faults in a timely manner, affecting the power restoration time.
A low-voltage power supply failure alarm system was designed, including a detection module, a control module, and an alarm module. The system uses relays and a PLC controller to detect voltage loss or phase loss and sends an alarm to the management personnel through light and sound alarm units.
It enables timely alarms to be issued in the event of voltage loss or phase loss faults, helping managers to quickly locate the faulty line and shorten the power restoration time.
Smart Images
Figure CN224594741U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power equipment technology, and in particular to a low-voltage power supply failure alarm system. Background Technology
[0002] As residents' living standards improve, their reliance on electricity in daily life is increasing. To meet users' aspirations for a better life, the reliability of power supply is becoming increasingly important, and the need for power supply backup is expanding. Currently, low-voltage power supply circuits often lack undervoltage and phase loss alarm functions, only providing alarms for overcurrent and tripping. When a low-voltage power supply undervoltage or phase loss fault occurs, management personnel cannot obtain effective information in a timely manner, inevitably prolonging the power restoration time. Therefore, if mains power undervoltage and phase loss faults cannot be detected promptly, the reliability of power supply backup will be greatly affected. Utility Model Content
[0003] The purpose of this invention is to provide a low-voltage power supply undervoltage alarm system to solve the technical problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides a low-voltage power supply undervoltage alarm system, including a detection module, a control module, and an alarm module; wherein,
[0005] The detection module is configured to collect the voltages of phases A, B, and C of the 380V mains power supply, and send a corresponding trigger signal to the control module when phases A, B, and / or C lose voltage.
[0006] The control module is configured to control the alarm module to issue a corresponding alarm signal upon receiving a corresponding trigger signal.
[0007] Furthermore, the detection module includes three relays and a trigger power supply. The control circuits of the three relays are connected in series between phase A and neutral, phase B and neutral, and phase C and neutral of the 380V mains power, respectively. The trigger power supply is connected to one end of the load circuit of the three relays, and the other end of the load circuit of the three relays is connected to three different input pins of the control module, respectively.
[0008] Furthermore, the control module is a PLC controller.
[0009] Furthermore, the trigger power supply is a 24V DC power supply.
[0010] Furthermore, an air switch is connected in series in the control circuit of the relay.
[0011] Furthermore, the alarm module includes a light alarm unit, which includes at least four alarm lights, each of which is connected to one of the four different output pins of the PLC controller.
[0012] Furthermore, the alarm module includes a sound alarm unit, which includes a buzzer, and the buzzer is connected to the output pin of the PLC controller.
[0013] Furthermore, the detection module includes four relays, wherein the control circuits of the first relay, the second relay, and the third relay are connected in series between phase A and neutral, phase B and neutral, and phase C and neutral of the 380V mains power, respectively.
[0014] The control module includes a trigger power supply, a load circuit for the first relay, a load circuit for the second relay, a load circuit for the third relay, and a fourth relay. Five preset lines are connected in parallel between the trigger power supply and ground.
[0015] The first preset circuit includes the load circuit of the first relay and the load circuit of the fourth relay connected in series.
[0016] The second preset circuit includes the load circuit of the second relay and the load circuit of the fourth relay connected in series;
[0017] The third preset circuit includes the load circuit of the third relay and the load circuit of the fourth relay connected in series.
[0018] The fourth preset circuit includes the load circuit of the first relay, the load circuit of the second relay, the load circuit of the third relay, and the control circuit of the fourth relay connected in series.
[0019] The fifth preset circuit includes the load circuit of the fourth relay;
[0020] The alarm module includes a light alarm unit, which includes four alarm lights, which are connected in series on the first preset line, the second preset line, the third preset line and the fifth preset line respectively.
[0021] Furthermore, the alarm module includes a sound alarm unit, which includes a buzzer. The load circuits of the first relay, the second relay, the third relay, and the fourth relay are connected in parallel between one end of the buzzer and the trigger power supply, and the other end of the buzzer is grounded.
[0022] Furthermore, the trigger power supply is a 24V DC power supply.
[0023] The beneficial effects of this utility model are reflected in:
[0024] The low-voltage power supply undervoltage alarm system provided by this utility model can promptly issue an alarm signal when a 380V mains power supply experiences undervoltage or phase loss faults, enabling managers to obtain effective information in a timely manner, quickly locate the faulty power distribution line, and promptly eliminate the fault and restore power supply. Attached Figure Description
[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.
[0027] Figure 1 A schematic diagram of a low-voltage power supply undervoltage alarm system provided in this embodiment of the present invention;
[0028] Figure 2 A wiring diagram of the relay control circuit and 380V mains power provided for an embodiment of this utility model;
[0029] Figure 3 A circuit diagram of a first type of control module provided for an embodiment of this utility model;
[0030] Figure 4 A circuit diagram of the second detection module provided in this embodiment of the utility model;
[0031] Figure 5 The connection circuit diagram between the buzzer and the second detection module provided in this embodiment of the utility model.
[0032] The realization of the objectives, functional features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation
[0033] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.
[0034] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.
[0035] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0036] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.
[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0039] like Figure 1As shown in the figure, a low-voltage power supply undervoltage alarm system provided by this utility model includes a detection module, a control module, and an alarm module. The detection module is configured to collect the voltages of phases A, B, and C of a 380V mains power supply. When phases A, B, and / or C lose voltage, the detection module sends a corresponding trigger signal to the control module. The control module is configured to control the alarm module to issue a corresponding alarm signal after receiving the corresponding trigger signal.
[0040] The low-voltage power supply undervoltage alarm system provided by this utility model can promptly issue an alarm signal when a 380V mains power supply experiences undervoltage or phase loss faults, enabling managers to obtain effective information in a timely manner, quickly locate the faulty power distribution line, and promptly eliminate the fault and restore power supply.
[0041] like Figure 2 , Figure 3 As shown, in one possible implementation, the detection module includes three relays and a trigger power supply. The control circuits of the three relays are connected in series between phase A and neutral, phase B and neutral, and phase C and neutral of a 380V AC mains power supply, respectively. The trigger power supply is connected to one end of the load circuit of the three relays, and the other end of the load circuit of the three relays is connected to three different input pins of the control module, respectively. To ensure circuit safety, an air switch can be connected in series with the control circuit of the relays for circuit protection.
[0042] For example, such as Figure 3 As shown, the control module can be a PLC controller. The trigger power supply is a 24V DC power supply. The alarm module includes a light alarm unit, which includes at least four alarm lights, each of which is connected to one of the four different output pins of the PLC controller. The alarm module may also include an audible alarm unit, which includes a buzzer connected to an output pin of the PLC controller.
[0043] like Figure 2 , Figure 3 The low-voltage power supply failure alarm system shown will de-energize the corresponding relay control circuit and energize the load circuit when one or more phases of A, B, and C lose voltage. The voltage of the corresponding input pin of the PLC controller will rise to 24V, and the PLC controller will control the corresponding output pin to output a high voltage, causing the corresponding alarm light to light up and the buzzer to sound. The sound will alert the management personnel to the phase failure fault, and the lighting of the corresponding alarm light will specifically indicate which phase(s) are losing voltage.
[0044] Understandably, if it's necessary to monitor voltage loss issues on different lines simultaneously, such as different floors using different distribution boxes, a corresponding detection and alarm module can be added for each line, while using a single control module. This allows multiple lines to be controlled by a single module, saving hardware costs. Furthermore, multiple alarm lights corresponding to each floor can be connected to the PLC controller. When a voltage loss issue occurs on a line on a certain floor, the corresponding alarm light illuminates, providing timely floor information and facilitating rapid location of the floor where the voltage loss occurred. For example, in this embodiment, the alarm lights can be LEDs.
[0045] Considering the high cost of PLC controllers, the low-voltage power supply undervoltage alarm system in this embodiment can also be implemented in the following way, for example.
[0046] For example, such as Figure 2 , Figure 4 As shown, the detection module includes four relays, wherein the control circuits of the first, second, and third relays are connected in series between phase A and neutral, phase B and neutral, and phase C and neutral, respectively, of the 380V AC mains power. The control module includes a trigger power supply, a load circuit for the first, second, and third relays, and a fourth relay. Five preset lines are connected in parallel between the trigger power supply and ground. Specifically, the first preset line includes the load circuits of the first and fourth relays connected in series; the second preset line includes the load circuits of the second and fourth relays connected in series; the third preset line includes the load circuits of the third and fourth relays connected in series; the fourth preset line includes the load circuits of the first, second, third, and fourth relays connected in series; and the fifth preset line includes the load circuit of the fourth relay.
[0047] The alarm module includes a light alarm unit, which includes four alarm lights, which are connected in series on the first preset line, the second preset line, the third preset line and the fifth preset line respectively.
[0048] The alarm module may further include an audible alarm unit, which includes a buzzer, such as... Figure 5 As shown, the load circuits of the first relay, the second relay, the third relay, and the fourth relay are connected in parallel between one end of the buzzer and the trigger power supply, and the other end of the buzzer is grounded. In this design, the trigger power supply is also a 24V DC power supply.
[0049] The working principle is as follows:
[0050] When phase A loses voltage, the coil of intermediate relay KA1 connected to phase A is de-energized, the normally closed contact closes, and current flows through the normally closed contacts of KA1 and KA4, illuminating the indicator light of phase A. At the same time, the normally closed contact of KA1 closes, connecting the buzzer circuit, causing the buzzer to emit an audible alarm.
[0051] When the line loses voltage, coils KA1, KA2, and KA3 lose power and their normally closed contacts close. Coil KA4 is energized and its normally open contact closes, illuminating the undervoltage indicator light. At the same time, the buzzer circuit is activated, causing the buzzer to sound an alarm. The normally closed contact of KA4 is also opened, extinguishing the phase loss indicator lights for phases A, B, and C, thus making the action indication more accurate.
[0052] Finally, it should be noted that the technical features of the technical solution of this application can be combined arbitrarily. In order to simplify the description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.
[0053] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.
Claims
1. A low-voltage power supply failure alarm system, characterized in that, It includes a detection module, a control module, and an alarm module; among which, The detection module is configured to collect the voltages of phases A, B, and C of the 380V mains power supply, and send a corresponding trigger signal to the control module when phases A, B, and / or C lose voltage. The control module is configured to control the alarm module to issue a corresponding alarm signal upon receiving a corresponding trigger signal.
2. The low-voltage power supply undervoltage alarm system as described in claim 1, characterized in that, The detection module includes three relays and a trigger power supply. The control circuits of the three relays are connected in series between phase A and neutral, phase B and neutral, and phase C and neutral of the 380V mains power, respectively. The trigger power supply is connected to one end of the load circuit of the three relays, and the other end of the load circuit of the three relays is connected to three different input pins of the control module, respectively.
3. A low-voltage power supply undervoltage alarm system as described in claim 2, characterized in that, The control module is a PLC controller.
4. A low-voltage power supply undervoltage alarm system as described in claim 3, characterized in that, The trigger power supply is a 24V DC power supply.
5. A low-voltage power supply undervoltage alarm system as described in claim 3, characterized in that, An air switch is connected in series in the control circuit of the relay.
6. A low-voltage power supply undervoltage alarm system as described in claim 3, characterized in that, The alarm module includes a light alarm unit, which includes at least four alarm lights, each of which is connected to one of the four different output pins of the PLC controller.
7. A low-voltage power supply undervoltage alarm system as described in claim 3, characterized in that, The alarm module includes a sound alarm unit, which includes a buzzer, and the buzzer is connected to the output pin of the PLC controller.
8. A low-voltage power supply undervoltage alarm system as described in claim 1, characterized in that, The detection module includes four relays, wherein the control circuits of the first relay, the second relay, and the third relay are connected in series between phase A and neutral, phase B and neutral, and phase C and neutral of the 380V mains power, respectively. The control module includes a trigger power supply, a load circuit for a first relay, a load circuit for a second relay, a load circuit for a third relay, and a fourth relay. Five preset lines are connected in parallel between the trigger power supply and ground. The first preset circuit includes the load circuit of the first relay and the load circuit of the fourth relay connected in series. The second preset circuit includes the load circuit of the second relay and the load circuit of the fourth relay connected in series. The third preset circuit includes the load circuit of the third relay and the load circuit of the fourth relay connected in series. The fourth preset circuit includes the load circuit of the first relay, the load circuit of the second relay, the load circuit of the third relay, and the control circuit of the fourth relay connected in series. The fifth preset circuit includes the load circuit of the fourth relay; The alarm module includes a light alarm unit, which includes four alarm lights, which are connected in series on the first preset line, the second preset line, the third preset line and the fifth preset line respectively.
9. A low-voltage power supply undervoltage alarm system as described in claim 8, characterized in that, The alarm module includes a sound alarm unit, which includes a buzzer. The load circuits of the first relay, the second relay, the third relay, and the fourth relay are connected in parallel between one end of the buzzer and the trigger power supply. The other end of the buzzer is grounded.
10. A low-voltage power supply undervoltage alarm system as described in claim 8, characterized in that, The trigger power supply is a 24V DC power supply.