Toll station power supply line automatic switching circuit with alarm device
By designing automatic switching circuits and alarm devices in the power supply lines of the expressway toll station, the problem of traffic congestion caused by manual switching during power supply lines is solved, and automatic seamless switching and timely fault reminders are achieved.
Patent Information
- Application Number
- CN202421731058.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-22
AI Technical Summary
When the power supply line of the expressway toll station fails, it is necessary to manually switch the spare line, resulting in traffic congestion and reduced traffic efficiency.
An automatic switching circuit of the toll station power supply line with an alarm device is designed, and the dual power conversion switch between the main power supply terminal and the secondary power supply terminal is used to achieve automatic switching, eliminating manual intervention.
It realizes seamless switching between multiple normal power supply terminals, avoids traffic jams and reduced traffic efficiency, and promptly reminds of fault conditions through alarm devices.
Smart Images
Figure CN223039700U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supply and distribution, and particularly relates to an automatic switching circuit for a toll station power supply line with an alarm device. Background Art
[0002] Highway toll stations are facilities for collecting tolls from passing vehicles. They are usually built in locations far from urban areas, and each toll station needs to ensure the power supply of its electrical devices 24 hours a day, including the pole lifting system, ETC system, license plate information collection system, etc.
[0003] When the power supply line of a highway toll station is powered off due to accidental reasons such as lightning strikes or line failures, it will cause passing vehicles to be unable to be billed and pass normally, and vehicles may be stuck outside the toll station. If the power supply cannot be restored in time, it may lead to traffic jams, seriously affecting traffic order. The existing highway toll stations adopt the method of multi-power supply line backup power supply to solve the above problems, such as using commercial power and multiple UPS devices for multi-channel backup. Among them, the UPS device refers to an uninterruptible power supply device, which is widely used in technical fields such as mines, aerospace, industry, communications, national defense, hospitals, computer business terminals, and network servers.
[0004] Although the above multi-power supply line backup power supply method ensures the power supply stability of highway toll stations to a certain extent, when a certain power supply line fails and loses power, switching to other power supply lines often requires manual intervention, which is relatively inefficient and error-prone. Since the vehicles passing through the highway toll station are often queuing continuously, too long a switching interval time may lead to traffic jams, thereby affecting the release efficiency of the entire highway toll station; and when the commonly used power supply line is repaired, manual switching back is often required, which will interrupt the smoothness of vehicle release again. Summary of the Utility Model
[0005] In order to solve the above problems, the purpose of the utility model is to provide an automatic switching circuit for a toll station power supply line with an alarm device. This kind of automatic switching circuit for the power supply line can perform seamless switching among multiple normal power supply lines, eliminate the power-off impact on the electrical equipment of the highway toll station due to line switching, thereby ensuring the smoothness when the vehicle flow passes and avoiding traffic jams.
[0006] In order to solve the above problems, the specific technical solutions adopted by the utility model are as follows:
[0007] An automatic switching circuit for a toll station power supply line with an alarm device, comprising a power supply end and a load end, characterized in that the power supply end includes a main power supply end and a secondary power supply end; this automatic switching circuit further includes a dual-power conversion switch for changing the connection relationship between the main / secondary power supply end and the load end; the normal switch path of the dual-power conversion switch is connected between the main power supply end and the load end; the standby switch path of the dual-power conversion switch is connected between the secondary power supply end and the load end; multiple secondary power supply ends are provided; multiple dual-power conversion switches are provided.
[0008] Thus, the power supply end is used to supply power to the pole-lifting system, ETC system, and license plate information collection system of the highway toll station on a daily basis, and the above-mentioned electrical equipment is the load end. Where conditions permit, the power supply end can be the introduced mains power line; in cases where conditions do not permit, it can be a UPS power supply device.
[0009] The power supply end includes a main power supply end and a secondary power supply end. The main power supply end is a daily stable power supply end, preferably the mains power line. Multiple secondary power supply ends are provided, which mainly serve as backup power supplies to ensure that when a power failure occurs at the main power supply end, the pole-lifting system, ETC system, and license plate information collection system of the highway toll station can continue to operate normally, avoiding traffic jams and affecting traffic efficiency.
[0010] A dual-power conversion switch is provided between the main power supply end and the secondary power supply end. The dual-power conversion switch is a switch that can automatically identify the status of the power supply end and achieve automatic millisecond-level switching. It includes a set of output contacts and two sets of input contacts, and thus can form two switch paths. Among them, the normal switch path is connected between the main power supply end and the load end; the standby switch path is connected between the secondary power supply end and the load end. Specifically, the output contacts are electrically connected to the load through wires. One set of input contacts of the normal switch path is electrically connected to the main power supply end, and one set of input contacts of the standby switch path is connected to one set of output contacts of another dual-power conversion switch. One set of input contacts of the normal switch path of this dual-power conversion switch is electrically connected to the secondary power supply end. In addition, in the normal working state, one set of output contacts of any dual-power conversion switch is default connected to one set of input contacts of the normal switch path. Only when this dual-power conversion switch detects a fault in the power supply device connected to the normal switch path, will it immediately jump and connect to the standby switch path.
[0011] Based on the above connection relationship, it can be known that when the main power supply terminal is working normally, the normal switch path of the first dual-power conversion switch electrically connects the main power supply terminal and the load terminal, and the load terminal is powered on and thus works normally. When lightning strikes or other accidental reasons cause the main power supply terminal to fail and power off, the above-mentioned first dual-power conversion switch will automatically detect the fault condition of the main power supply terminal, causing the dual-power conversion switch to immediately change the switch connection state, that is, disconnect the connection between the output contact and the input contact of the normal switch path, and automatically complete the closed connection between the output contact and the input contact of the standby switch path. That is, the action of switching from the normal switch path to the standby switch path is completed.
[0012] At this time, since a set of input contacts of the standby switch path of the first dual-power conversion switch are connected to a set of output contacts of the second dual-power conversion switch, and the dual-power conversion switch is in the default connection state under the normal switch path, the load is directly electrically connected to the secondary power supply terminal, and the load is powered on from the secondary power supply terminal and can work normally. When there are multiple secondary power supply terminals, they can be connected in a cycle according to the above method to achieve automatic backward switching when the previous secondary power supply terminal also fails and powers off, ensuring that the load terminal can always be continuously powered on.
[0013] In summary, by means of multiple power supply terminals, the corresponding multiple dual-power conversion switches connected to each of them, and the cyclic connection between the output / input contacts, seamless switching can be achieved among multiple normal power supply terminals, eliminating the power-off impact on the electrical load of the highway toll station due to line switching, thereby ensuring the smoothness when the vehicle flow passes and avoiding the occurrence of vehicle flow jams.
[0014] As a preference of the present utility model, the automatic switching circuit further includes an alarm device for emitting a fault reminder signal and an intermediate relay for controlling the alarm device to sound, which are connected in parallel to the load terminal; the alarm device is connected in series with the normally closed contact of the intermediate relay, and the relay coil of the intermediate relay is connected in parallel with the power supply terminal.
[0015] Since the switching between the main power supply terminal and the secondary power supply terminal is in milliseconds, it is almost in a seamless switching state. Therefore, equipment management personnel are likely to be unable to detect that there is a faulty power supply terminal, and thus unable to arrange personnel for maintenance in a timely manner. To solve the above problems, an alarm device and an intermediate relay for controlling the alarm device to sound are specifically provided. The alarm device is connected in parallel across the load terminal, and it is simultaneously connected in series with the normally closed contact of the intermediate relay; the relay coil of the intermediate relay is connected in parallel with the power supply terminal. When the power supply terminal is in a normal working state, the relay coil is always powered on, and thus the normally closed contact of the intermediate relay is always in an open state. That is, although the alarm device is connected in parallel across the load terminal, it cannot be powered on to emit an alarm signal all the time.
[0016] When the power supply terminal fails and disconnects, the relay coil loses power synchronously, causing the normally closed contact to resume the closed state. At the same time, due to the existence of the secondary power supply terminal, the load terminal continues to be powered, enabling the circuit of the alarm device to be conducted, and then the alarm device emits an alarm signal.
[0017] Specifically, since there are multiple secondary power supply terminals, in order to enable the alarm device to emit an alarm signal when any one of the power supply terminals fails and loses power, multiple intermediate relays are provided in parallel. Their respective coils are respectively connected in parallel to each secondary power supply terminal, and their respective normally closed contacts are connected in parallel with each other, and both ends are connected to the alarm device and the load terminal.
[0018] As a preference of the present utility model, the main power supply terminal is a three-phase power supply terminal; the secondary power supply terminal is a single-phase power supply terminal.
[0019] Since the three-phase power supply form is superior to the single-phase power supply terminal in terms of stability and maximum load power, the main power supply terminal is set as a three-phase power supply terminal and connected to the three-phase load terminal. At the same time, considering cost factors, the secondary power supply terminal is set in the form of single-phase power supply. For the load terminal, the circuit switching elements in the prior art can enable it to work normally in both the three-phase power supply mode and the single-phase power supply mode. In terms of the connection method, a set of output contacts of the double power supply transfer switch corresponding to the main power supply terminal has four, which are respectively connected to one neutral wire and three live wires of the three-phase load; at the same time, a set of input contacts of the normal switch path corresponding to the double power supply transfer switch also includes four, which are respectively connected to one neutral wire and three live wires of the three-phase power supply terminal; a set of input contacts of the standby switch path corresponding to the double power supply transfer switch also includes four, but the three input contacts at the corresponding positions of the three live wires are connected in parallel to the same wire and connected to one of the output contacts of a double power supply transfer switch corresponding to the secondary power supply terminal, and one input contact at the corresponding position of the neutral wire is connected to the other output contact of a double power supply transfer switch corresponding to the secondary power supply terminal.
[0020] As a preference of the present utility model, a circuit breaker for overload protection is connected in series between the power supply terminal and the double power supply transfer switch.
[0021] As a preference of the present utility model, the main power supply terminal is a mains power supply; the secondary power supply terminal is a UPS power supply.
[0022] As a preference of the present utility model, the main power supply terminal is a UPS power supply; the secondary power supply terminal is a mobile generator.
[0023] As a preference of the present utility model, the alarm device includes an LED warning light for emitting a flashing light signal and a buzzer for emitting a prompting sound.
[0024] As a preference of the present utility model, the alarm device includes a wireless signal transmitting device, and the wireless signal transmitting device is used to send power supply equipment fault alarm information to a control management center through a wireless network.
[0025] As a preference of the present utility model, the alarm device includes a read-write memory, and the read-write memory is used to record power supply equipment fault information.
[0026] In summary, the present utility model has the following beneficial effects:
[0027] 1. With the help of multiple power supply ends, the corresponding multiple double power conversion switches respectively connected thereto, and the loop connection between output / input contacts, seamless switching can be realized on multiple normal power supply ends, eliminating the power-off impact on the power consumption load of highway toll stations due to line switching, thereby ensuring the smoothness when the vehicle flow passes and avoiding the occurrence of vehicle flow jams.
[0028] 2. By setting an alarm device and an intermediate relay for controlling the alarm device to sound, the function that the alarm device can emit an alarm signal when any power supply end fails and loses power can be realized. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is the circuit diagram of the automatic switching circuit of this power supply line. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] The preferred embodiments of the present disclosure will be described in more detail below with reference to the drawings. Anyone can implement the present disclosure in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be more thorough and complete, and can fully convey the scope of the present disclosure to those skilled in the art.
[0031] The term "including" and its variants used herein mean open inclusion, that is, "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The term "an exemplary embodiment" and "an embodiment" mean "at least one exemplary embodiment". The term "another embodiment" means "at least one additional embodiment".
[0032] As Figure 1 shown, the automatic switching circuit of the power supply line in this embodiment includes a main power supply end P1, a secondary power supply end P2, a secondary power supply end P3, and a secondary power supply end P4. Among them, the main power supply end P1 is a three-phase mains network, and the load A is a three-phase electrical equipment; the secondary power supply ends P2, P3, and P4 are single-phase power supply ends.
[0033] The main power supply terminal P1 is connected to the load A through the dual-power conversion switch ATSE1. The normal switch path of the dual-power conversion switch ATSE1 is connected between the main power supply terminal and the load terminal; the standby switch path is connected between the secondary power supply terminal P2 and the load terminal A. Specifically, the output contacts of the dual-power conversion switch ATSE1 are electrically connected to the load terminal A through wires. A set of input contacts of the normal switch path are electrically connected to the main power supply terminal P1. A set of input contacts of the standby switch path are connected to a set of output contacts of the dual-power conversion switch ATSE2. A set of input contacts of the normal switch path of the dual-power conversion switch ATSE2 are electrically connected to the secondary power supply terminal P2. A set of input contacts of the standby switch path of the dual-power conversion switch ATSE2 are connected to a set of output contacts of the dual-power conversion switch ATSE3. A set of input contacts of the normal switch path of the dual-power conversion switch ATSE3 are electrically connected to the secondary power supply terminal P3. A set of input contacts of the standby switch path of the dual-power conversion switch ATSE2 are electrically connected to the secondary power supply terminal P4.
[0034] In addition, a circuit breaker QF1 is connected in series between the main power supply terminal P1 and the dual-power conversion switch ATSE1; a circuit breaker QF2 is connected in series between the secondary power supply terminal P2 and the dual-power conversion switch ATSE2; a circuit breaker QF3 is connected in series between the secondary power supply terminal P3 and the dual-power conversion switch ATSE3; a circuit breaker QF4 is connected in series between the secondary power supply terminal P4 and the dual-power conversion switch ATSE3. The circuit breakers QF1, QF2, QF3, and QF4 are used to provide overload protection to prevent the dual-power conversion switch from being damaged due to too high instantaneous power caused by a fault at the power supply terminal.
[0035] Moreover, an alarm device SA and a intermediate relay for controlling the alarm device to sound are provided. The alarm device is connected in parallel across the load terminal A and is connected in series with the normally closed contacts of the intermediate relay at the same time; the relay coil of the intermediate relay is connected in parallel with the power supply terminal. When the power supply terminal is in normal operation, the relay coil is always energized, so that the normally closed contacts of the intermediate relay are always in the open state. That is, although the alarm device SA is connected in parallel across the load terminal A, it cannot be energized to send an alarm signal all the time.
[0036] When the power supply terminal fails and disconnects, the relay coil loses power synchronously, causing the normally closed contacts to return to the closed state. At the same time, due to the existence of the secondary power supply terminal, the load terminal A continues to be powered, making the circuit of the alarm device SA be turned on, and then the alarm device A sends an alarm signal.
[0037] In particular, since there are multiple secondary power supply terminals, in order to enable the alarm device SA to send an alarm signal when any one of the power supply terminals fails and powers off, multiple parallel intermediate relays are provided. Their respective coils are respectively connected in parallel to each secondary power supply terminal, and their respective normally closed contacts are connected in parallel to each other, and both ends are connected to the alarm device and the load terminal. Specifically, as Figure 1As shown, a relay coil of an intermediate relay KA1, a relay coil of an intermediate relay KA2, and a relay coil of an intermediate relay KA3 are respectively connected in parallel across the main power supply terminal P1, the secondary power supply terminal P2, and the secondary power supply terminal P3; and normally closed switches of the intermediate relay KA1, the intermediate relay KA2, and the intermediate relay KA3 are connected in parallel with each other and are neatly connected in series to the alarm device SA, thereby enabling the alarm device SA to emit an alarm signal when any one of the power supply terminals fails and loses power.
[0038] In another embodiment, the main power supply terminal P1 is a mains power supply, the secondary power supply terminals P2 and P3 are UPS power supplies, and the secondary power supply terminal P4 is a mobile generator. At this time, the mobile generator serves as the last line of power supply defense and does not need to be connected to the double power supply transfer switch anymore, playing the role of the final emergency power supply.
[0039] In another embodiment, the alarm device includes an LED warning light for emitting a flashing light signal and a buzzer for emitting a prompt sound. The warning effect is enhanced through the dual prompt functions of light and sound.
[0040] In another embodiment, the alarm device includes a wireless signal transmitting device, which is used to send power supply device failure alarm information to the control and management center through a wireless network. At this time, the remote control and management center can timely grasp the power supply status of each highway toll station.
[0041] In another embodiment, the alarm device includes a read-write memory, which is used to record power supply device failure information. This information can be used for subsequent fault troubleshooting and statistics, and can also be sent through the wireless signal transmitting device, so that experts in the distance can quickly master the on-site situation.
[0042] Multiple embodiments of the present disclosure have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary technicians in the technical field to understand the disclosed embodiments.
Claims
1. A toll station power supply line automatic switching circuit with an alarm device, comprising a power supply end and a load end, characterized in that: The power supply end includes a main power supply end and an auxiliary power supply end; the automatic switching circuit also includes a dual power conversion switch for changing the connection relationship between the main / auxiliary power supply end and the load end; the common switch path of the dual power conversion switch is connected between the main power supply end and the load end; the backup switch path of the dual power conversion switch is connected between the auxiliary power supply end and the load end; there are multiple auxiliary power supply ends; there are multiple dual power conversion switches; the automatic switching circuit also includes an alarm device connected in parallel to the load end for issuing a fault reminder signal and an intermediate relay for controlling the sound of the alarm device; the alarm device is connected in series with the normally closed contact of the intermediate relay, and the relay coil of the intermediate relay is connected in parallel with the power supply end.
2. The automatic switching circuit of the toll station power supply line with an alarm device according to claim 1 is characterized in that: The main power supply end is a three-phase power supply end; the auxiliary power supply end is a single-phase power supply end.
3. The automatic switching circuit of the toll station power supply line with an alarm device according to claim 2 is characterized in that: A circuit breaker for overload protection is connected in series between the power supply end and the dual power conversion switch.
4. The automatic switching circuit of the toll station power supply line with an alarm device according to claim 1 is characterized in that: The main power supply end is a commercial power supply; the auxiliary power supply end is a UPS power supply.
5. The automatic switching circuit of the toll station power supply line with an alarm device according to claim 1 is characterized in that: The main power supply end is a UPS power supply; the auxiliary power supply end is a mobile generator.
6. The automatic switching circuit of the toll station power supply line with an alarm device according to claim 1, characterized in that: The alarm device comprises an LED warning light for emitting a flashing light signal and a buzzer for emitting a prompt sound.
7. The automatic switching circuit of the toll station power supply line with an alarm device according to claim 6 is characterized in that: The alarm device comprises a wireless signal sending device, and the wireless signal sending device is used to send power supply equipment failure alarm information to a control management center via a wireless network.
8. The automatic switching circuit of the toll station power supply line with an alarm device according to claim 7 is characterized in that: The alarm device comprises a readable and writable memory, and the readable and writable memory is used to record the fault information of the power supply equipment.