Alternating magnetic field induction-based group-controllable emergency lighting system

Abstract

The application discloses a kind of group control emergency lighting systems based on alternating magnetic field induction, including alternating magnetic field induction module, emergency lighting control module, group control module, power module and function switcher;Alternating magnetic field induction module includes inductance and multiple triodes;Emergency lighting control module receives the signal sent by alternating magnetic field induction module;Group control module includes remote control switch, signal receiver and signal transmitter, signal transmitter receives the trigger signal of remote control switch, sends control signal according to preset frequency;Signal receiver receives the control signal sent by corresponding signal transmitter;Power module is used to power supply for alternating magnetic field induction module, group control module and emergency lighting control module;Function switcher is used to control the group control operation and stop operation of remote control.The system reduces the construction cost of rewiring to existing building, increases group control ability, simple operation, with mobility and turnover, can also be applicable to temporary power place.

Description

Technical Field

[0001] This invention relates to the field of emergency lighting system technology, and specifically to a group-controllable emergency lighting system based on alternating magnetic field induction. Background Technology

[0002] Currently, fire emergency lighting devices on the market are divided into centralized control systems and non-centralized control systems. The common operating mode of a centralized control system is that, in the event of a fire, the fire alarm controller activates the emergency lighting controller, which then switches all centralized power supplies to battery power output. The emergency lighting distribution box then cuts off the main power output and controls the connected lamps to illuminate in an emergency.

[0003] In a fire, the common operating mode of a non-centralized control system is that the fire alarm controller activates the various centralized power supplies through contact action. In non-fire conditions, it connects to the mains power monitoring line to monitor the power status and automatically switches between mains and backup power to provide emergency lighting. Furthermore, traditional emergency lighting devices, such as self-powered, non-centralized control fire emergency lighting fixtures (peephole lights), are typically single-point controlled, activating emergency lighting by detecting the power supply status of the socket. This only allows for power detection within the current electrical circuit and cannot achieve centralized management and unified scheduling of multiple electrical circuits. Therefore, in emergencies such as large-scale power outages, they are unlikely to function quickly and efficiently.

[0004] In new buildings, this method can be achieved through pre-planned wiring, but it faces numerous difficulties in the renovation of existing buildings and temporary power supply scenarios. This is because rewiring existing buildings is costly and may damage the building structure; while temporary power supply sites often lack stable wiring conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a group-controllable emergency lighting system based on alternating magnetic field induction, which solves the problems of high cost of rewiring existing buildings, lack of group control capability, and lack of reusability of traditional wiring methods in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A group-controllable emergency lighting system based on alternating magnetic field induction includes an alternating magnetic field induction module, an emergency lighting control module, a group control module, a power supply module, and a function switching switch.

[0008] The alternating magnetic field sensing module includes an inductor and multiple transistors; the inductor is used to sense alternating magnetic field signals in the surrounding environment and convert the magnetic field changes into electrical signals; the transistors are used to amplify and process the electrical signals.

[0009] The emergency lighting control module is used to receive signals from the alternating magnetic field induction module and activate the emergency lighting fixtures when a power outage signal is detected.

[0010] The group control module includes a remote control switch, a signal receiver, and a signal transmitter. The signal transmitter receives the trigger signal from the remote control switch and sends control signals at a preset frequency. Each emergency lighting control module is equipped with a signal receiver, which receives the control signals sent by the corresponding signal transmitter.

[0011] The power module is used to supply power to the alternating magnetic field induction module, the group control module, and the emergency lighting control module;

[0012] The function switch is used to control the group control operation and stop the operation of the remote control.

[0013] Preferably, the transistor can be replaced with a field-effect transistor.

[0014] Preferably, when power is supplied normally, the alternating magnetic field is in a stable state, and the inductor can output a relatively stable electrical signal; when power is interrupted, the alternating magnetic field will change accordingly, and the electrical signal output by the inductor will continue to weaken until it disappears.

[0015] Preferably, during the fabrication of the inductor, the inductance effect is achieved by winding the detection circuit with insulated wire, with the number of winding turns initially set to 3 to 5 turns; when the LED indicator in the sensing circuit is not lit or the brightness is insufficient, the number of coil turns is increased; when the LED in the sensing circuit is too bright, the number of coil turns is reduced.

[0016] Preferably, the frequency of the control signal emitted by the signal transmitter is 433MHz.

[0017] Preferably, the function switching switch is a four-position five-pin switch.

[0018] In this invention, the sensing technology differs significantly: existing technologies often rely on the output contact action of fire alarm controllers or mains power monitoring lines for power status monitoring. This invention, however, employs alternating magnetic field sensing technology, detecting power outages by detecting changes in the magnetic field, resulting in higher sensitivity and eliminating the need for complex fire control lines and mains power monitoring wiring. The control method is also upgraded: traditional devices primarily use single-loop control, while this invention introduces a group control module, utilizing wireless communication technology to achieve centralized control and remote management of multiple emergency lighting devices, making the control method more intelligent and efficient. Furthermore, the device's adaptability is enhanced: by eliminating complex wiring requirements, installation and use in complex scenarios such as existing buildings and temporary power supply locations are more convenient, broadening its applicability.

[0019] Highly sensitive alternating magnetic field induction technology ensures emergency lighting activates instantly upon power outage, with a activation time of less than one second, buying precious time for evacuation. Group control functionality allows managers to remotely manage and control multiple emergency lighting devices, monitoring equipment status in real time, improving management efficiency and reducing maintenance costs. No complex wiring is required, significantly reducing installation difficulty and cost. It is easily installed and used in new buildings, renovations of existing buildings, and temporary power supply locations, demonstrating strong adaptability. The device is equipped with a rechargeable battery, ensuring continuous emergency lighting for at least 3 hours after a power outage. The group control system also features a fault alarm function to promptly detect and address equipment malfunctions, ensuring the reliability of the emergency lighting system.

[0020] Rapid emergency lighting activation and reliable continuous illumination effectively ensure the safe evacuation of personnel in emergencies, reducing the risk of personal injury and property damage caused by darkness. The group control function enables centralized management and remote control of multiple emergency lighting devices, reducing the workload of manual inspection and operation, and improving the accuracy and timeliness of management. The simplified installation process reduces wiring costs and construction difficulty, while extended battery life and convenient maintenance management reduce long-term operating costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the system flowchart of the present invention;

[0022] Figure 2 This is a schematic diagram of the signal transmitting end circuit of the light-emitting board-remote controller in the joint operation state of the present invention;

[0023] Figure 3 This is a schematic diagram of the signal receiving end circuit of the light-emitting board-remote controller in the joint operation state of the present invention;

[0024] In the diagram: 1. Alternating magnetic field induction module; 2. Emergency lighting control module; 3. Group control module; 4. Power supply module; 5. Function switching switch; 10. Inductor; 11. Transistor; 30. Remote control switch; 31. Signal receiver; 32. Signal transmitter. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] like Figure 1 Figure 2 and Figure 3 The illustrated emergency lighting system based on alternating magnetic field induction is a group-controllable system comprising an alternating magnetic field induction module 1, an emergency lighting control module 2, a group control module 3, a power supply module 4, and a function switching switch 5.

[0027] The alternating magnetic field sensing module 1 includes an inductor 10 and multiple transistors 11. The inductor 10 senses the alternating magnetic field signal in the surrounding environment and converts the magnetic field change into an electrical signal. When power is supplied normally, the alternating magnetic field is in a stable state, and the inductor 10 can output a relatively stable electrical signal. When power is interrupted, the alternating magnetic field changes accordingly, and the electrical signal output by the inductor 10 continuously weakens until it disappears. The inductor 10 converts this magnetic field change into a weak electrical signal, which is then amplified and processed by multiple transistors 11 or field-effect transistors, enabling it to be accurately identified by the subsequent emergency lighting control module 2.

[0028] During the fabrication of inductor 10, the inductance effect is achieved by winding insulated wire around the detection circuit. The initial number of winding turns is set to 3 to 5 turns. When the LED indicator in the sensing circuit is not lit or the brightness is insufficient, the number of coil turns is increased. When the LED in the sensing circuit is too bright, the number of coil turns is reduced to optimize the inductance effect.

[0029] Transistor 11 is used to amplify and process the electrical signal generated by inductor 10; of course, transistor 11 can be replaced by a field-effect transistor. A transistor 11 with well-matched and consistent performance parameters should be selected, with a current amplification factor β typically between 20 and 200, to ensure stable and effective amplification of the weak electrical signal generated by the inductor. During mass production, transistor 11 should undergo rigorous screening and testing to guarantee the consistency of circuit performance.

[0030] The light-emitting diode (red LED) uses a high-brightness, low-power red LED with an operating voltage between 1.8 and 2.2V and an operating current controlled between 5 and 20mA to achieve a clear and stable status indication function.

[0031] Normally closed relays should be selected, and their coil rated voltage should match the circuit power supply voltage. If a 3V or 5V relay is used, the relay contact load capacity should meet the requirements of the emergency lighting circuit to ensure reliable circuit switching.

[0032] The emergency lighting control module 2 is used to receive signals from the alternating magnetic field induction module 1 and to activate the emergency lighting fixtures when a power outage signal is detected.

[0033] The group control module 3 includes a remote control switch 30, a signal receiver 31, and a signal transmitter 32. The signal transmitter 32 receives the trigger signal from the remote control switch 30 and sends out control signals at a preset frequency. Each emergency lighting control module 2 is equipped with a signal receiver 31, which receives the control signals sent by the corresponding signal transmitter 32.

[0034] The signal transmitter 32 uses a PT2262 chip as its encoding chip, operating at a fixed frequency of 315MHz or 433MHz, with a transmission power between 10 and 100mW. The PT2262 chip features high stability and strong encoding capabilities, ensuring stable transmission of control signals within a certain range (e.g., 30-50 meters in open environments). The signal receiver 31 uses a matching decoding chip, such as the PT2272, which has high sensitivity and anti-interference capabilities, accurately identifying the signals emitted by the signal transmitter 32. The operator controls the signal transmitter 32 to transmit signals via a remote control switch 30.

[0035] Power module 4 supplies power to alternating magnetic field induction module 1, group control module 3, and emergency lighting control module 2. Based on the battery life requirements of the emergency lighting fixtures, select a rechargeable battery pack of appropriate capacity, such as an 18650 lithium battery pack. The rated voltage of the battery pack should match the voltage requirements of other parts of the circuit, generally 3.7V, and the capacity can be between 1000 and 10000mAh to ensure that the emergency lighting duration is no less than 3 hours.

[0036] Power module 4 also includes a charging boost module, a Type-C charging port, and a low-battery alarm module. The charging boost module is a high-efficiency and stable module with a charging efficiency of no less than 80% and a boost conversion efficiency of no less than 90%. The module should have overcharge, over-discharge, overcurrent, and short-circuit protection functions to ensure the safety of the battery and circuitry. The Type-C charging port uses a standard-compliant Type-C port, supporting fast charging. The charging current can be selected according to battery capacity and charging time requirements, generally between 1 and 3A. The low-battery alarm module uses a high-precision power monitoring chip to accurately monitor battery power in real time. When the battery power falls below a set threshold (e.g., 20%), the low-battery alarm module should promptly issue an audible and visual alarm signal. The alarm sound intensity should be no less than 70 decibels, and the warning light should flash 1-2 times per second.

[0037] Function switch 5 is used to control the group control operation and stop operation of the remote control. Function switch 5 is a four-position five-pin switch. A reliable and flexible four-position five-pin selector switch should be selected, and its contact resistance should be as low as possible to ensure the stability and reliability of the working mode switching.

[0038] Alternating magnetic field induction principle:

[0039] During normal system operation, the power supply continuously powers the circuit, and the self-reset test button remains in its normal position. Inductor 10 continuously senses the surrounding alternating magnetic field, and the induced electromotive force generated is processed by the transistor 11 (S9014) amplifier circuit to output a stable signal. This signal, on the one hand, keeps the red LED in a certain state (e.g., lit up to indicate normal detection state), and on the other hand, keeps the normally closed contacts of the relay closed while the relay coil is always energized, preventing the emergency lighting from activating.

[0040] When a power supply anomaly occurs, such as a power outage or leakage, causing a change in the alternating magnetic field, the induced electromotive force generated by the inductor changes accordingly. Transistor 11 loses its stable input signal, and its output state changes. This change causes the normally closed contact of the relay to open, triggering the emergency lighting circuit and turning on the emergency lighting fixtures to provide illumination to the location.

[0041] How group control works:

[0042] For group control functionality, the four-position five-pin selector switch provides diverse operating mode options. In the LED panel-remote control mode, the control signal emitted by the signal transmitter 32 can be accurately received by the receiver 31, thereby enabling centralized control of multiple LED panels. The signal transmitter 32 and the remote control switch 30 together constitute the remote control. The remote control employs a low-power design, has a stable transmission signal frequency, and can reliably control the corresponding device within a certain range.

[0043] In terms of power management, the charging boost module connects to an external power source via a Type-C charging port, enabling efficient charging of the power supply. Simultaneously, this module can boost the battery voltage to an appropriate level based on the actual voltage requirements of various circuit components, ensuring stable circuit operation. The low battery alarm module monitors the battery level in real time and promptly issues an alarm signal when the battery level falls below a set threshold, reminding the user to charge or replace the battery in time, ensuring the emergency lighting device can function normally in critical moments.

[0044] Circuit board fabrication:

[0045] Through-hole (BH) circuit boards are selected, and their design is based on the circuit schematic. A suitable substrate material of appropriate thickness is chosen, such as FR-4 epoxy resin glass cloth laminate, typically between 1.0 and 1.6 mm thick. Component mounting holes are planned strategically on the circuit board to ensure easy insertion and secure soldering of component leads. Mounting holes are precisely machined using drilling equipment; the hole diameter should match the component lead diameter, generally 0.2–0.4 mm larger. A solder mask and silkscreen layer are applied to the circuit board surface. The solder mask prevents short circuits during soldering, while the silkscreen layer indicates component location and polarity. Selected components are inserted into their corresponding mounting holes via their leads and soldered using wave soldering at a temperature between 240 and 260°C for approximately 3–5 seconds to ensure full and strong solder joints. After soldering, the circuit board is cleaned to remove residual flux and other impurities. Comprehensive electrical testing is then performed, including open-circuit testing, short-circuit testing, voltage testing, and signal testing, to ensure all performance indicators meet requirements.

[0046] Printed Circuit Board (PCB): PCB design can also be used. A multi-layer PCB design is performed based on the circuit schematic, with components strategically placed to ensure the shortest and simplest circuit traces, minimizing signal interference and electromagnetic radiation. Professional PCB design software is used for routing; trace width and spacing are set according to circuit current and voltage requirements, typically between 0.2 and 0.5 mm for trace width and 0.2 and 0.3 mm for trace spacing. High-quality copper-clad laminate is selected, and the PCB is fabricated using etching, drilling, and electroplating processes. During fabrication, parameters such as trace width, spacing, and hole diameter are strictly controlled to ensure compliance with design requirements. Selected components are soldered onto the PCB using reflow soldering or wave soldering processes to ensure soldering quality and avoid issues such as cold solder joints and short circuits. After soldering, comprehensive electrical testing is performed on the PCB, including open-circuit testing, short-circuit testing, voltage testing, and signal testing, to ensure that all performance indicators of the PCB meet requirements.

[0047] Housing Assembly: The housing should be made of fire-resistant, flame-retardant, and high-strength plastic or metal materials. It should have good heat dissipation and a protection rating of IP54 or higher to adapt to different operating environments. Design a reasonable housing structure based on the dimensions of the circuit board and components to ensure secure and compact component mounting. Pre-drill suitable holes in the housing for mounting indicator lights, switches, charging ports, antennas, and other components. Install the tested and qualified circuit board into the housing and connect the wires of each component, ensuring a secure and reliable connection.

[0048] The system was debugged as a whole to check whether each function was normal, such as emergency lighting activation, group control function, low battery alarm, etc., to ensure that the system could work stably and reliably.

[0049] Group control system setup:

[0050] Remote Control Pairing: The group control function is achieved through a low-power miniature remote control switch 30 and a signal transmitter 32 equipped with a PT2262 chip. The PT2262 chip operates at a fixed frequency. When building a group control system, the frequency must be determined in advance based on the actual usage environment and requirements, and specified when customizing components. When the administrator presses the corresponding control button on the remote control switch 30, the internal circuit of the switch is activated, triggering the PT2262 chip encoding. The signal transmitter 32 then transmits a control signal at the preset fixed frequency. The signal receiver 31 (PT2272 chip) on the emergency lighting device receives the signal, decodes it, and triggers the emergency lighting fixtures to turn on, enabling multiple devices to light up simultaneously. Regarding signal coverage optimization, since the PT2262 chip has a fixed frequency, if the location is large or there is signal obstruction, signal repeaters can be added to enhance signal strength and coverage. However, it is necessary to ensure that the repeater and the PT2262 chip frequency match to guarantee stable operation of the group control function.

[0051] Operating Mode Settings: The operating mode of the emergency lighting system can be set via a four-position, five-pin selector switch. When the switch is in the "System Off" position, the system is in sleep mode, retaining only low-power power monitoring functionality; when in the "Light Panel-Remote Control Co-operation" position, the system can receive control signals from the remote control, enabling group control; when in the "Light Panel Independent Operation" position, the system is not controlled by the remote control and only automatically activates emergency lighting when an abnormal power supply is detected; when in other specific positions, functional expansion or special settings can be configured according to actual needs.

[0052] Signal coverage optimization: Based on the size and layout of the actual usage location, rationally arrange the location of the emergency lighting system to ensure that the remote control signal can effectively cover the entire area. If the location is large or there is signal obstruction, signal repeaters can be added or the transmission power of the remote control can be adjusted to enhance signal strength and coverage. At the same time, regularly inspect and maintain the signal receiving module to ensure its normal operation.

[0053] Replacement, expansion, and selection of key components, parts, parameters, or elements.

[0054] Inductor 10 Replacement: In special scenarios with extremely stringent requirements for device size, given that the insulated wires of the previously used winding detection circuit are insufficient in terms of space requirements, induction coils can be used as a replacement. Induction coils have the advantages of small size and good magnetic field concentration. For example, customized miniature flat induction coils can be used, with a height that can be controlled within 1-2 mm, effectively saving internal space and also enabling adsorption installation.

[0055] However, the inductive characteristics of an induction coil differ from those of an insulated wire. When replacing it, the inductance value must be remeasured, and the parameters of the connected transistor amplifier circuit must be adjusted according to the overall circuit requirements of the device. This includes optimizing the bias resistor and adjusting the amplification factor to ensure that the device's sensitivity to alternating magnetic fields is not reduced, thus maintaining stable operation of emergency lighting and group control functions.

[0056] Transistor 11 Expansion: In specialized applications with high signal amplification requirements, the number of transistors (11) can be increased, or a higher-performance transistor (11) model, such as the S9018, can be used to improve the signal amplification factor and circuit gain. Simultaneously, the circuit stability and anti-interference capability can be further enhanced by optimizing the transistor (11) bias circuit.

[0057] Remote Control Selection: For longer-range control or higher communication reliability, consider replacing the remote control and signal receiver. Existing remote controls based on the PT2262 chip may not meet requirements in some complex environments due to their fixed frequency limitations. In such cases, they can be replaced with remote controls based on wireless communication technologies such as Bluetooth, Wi-Fi, or Zigbee. However, this replacement requires not only upgrading and adapting the signal receiver of the emergency lighting system to support the new communication protocol, but also redesigning the entire remote control and receiving system, as the new wireless communication technologies have completely different operating principles and frequency characteristics from the PT2262 chip. Before making a replacement decision, factors such as cost, technical difficulty, and the actual usage scenario's requirements for communication distance and stability should be comprehensively considered.

[0058] Power Supply Expansion: For locations requiring extended emergency lighting duration, such as large shopping malls and underground parking lots, the number of battery packs can be increased or higher-capacity batteries can be selected to extend emergency lighting time. Simultaneously, renewable energy technologies such as solar charging can be considered to charge the battery packs, improving the system's energy efficiency and environmental performance.

[0059] Functional Expansion: Building upon basic emergency lighting and group control functions, functional expansion can be implemented based on actual needs. For example, adding environmental monitoring modules such as smoke sensors and temperature sensors can enable fire early warning and abnormal temperature alarms; or integrating a GPS positioning module can facilitate remote location and management of the device. When expanding functionality, corresponding modifications and optimizations to the circuitry are required to ensure that all modules can work collaboratively without affecting the original performance of the device.

[0060] In the appendix Figure 1 In the middle, the mode selection - transmitter section; four-position five-pin switch - transmitter: as the transmitter function mode selection component, it has four function settings.

[0061] Pin 1: System Off: Selecting this setting will put the transmitter into a system off state, stopping most functions and only maintaining functions such as low power monitoring.

[0062] Foot 2: Illuminated panel - remote control linkage: When this position is selected, the transmitter enters the linkage mode preparation state, and subsequent operations can be controlled by the remote control.

[0063] Foot 3: Independent operation of the light-emitting panel: This position puts the transmitter into an independent operation mode preparation state. The operation of the light-emitting panel is not controlled by the remote control and operates autonomously according to its own detection conditions.

[0064] Foot 4: System Shutdown: Same function as foot 1, causing the transmitter to enter the system shutdown state.

[0065] Transmitter section:

[0066] Power Supply - Transmitter: After preparing for either the linkage mode or the independent operation mode, connect the power supply to the transmitter and simultaneously activate the power detection circuit.

[0067] Self-reset test button - transmitter: Used for manually testing the transmitter circuit status.

[0068] Transistor amplifier circuit - emitter: amplifies the input signal.

[0069] Red LED indicator - transmitter: Indicates the working status of the transmitter circuit.

[0070] Relay - Transmitter: Its operating state is controlled by the output signal of the transistor amplifier circuit.

[0071] Power detection circuit - transmitter: Real-time monitoring of power status.

[0072] Is the power supply normal? - Transmitter: Assess the power supply status.

[0073] Abnormal: If there is a power failure, the emergency signal transmission logic is triggered, causing the remote control transmitter to send a control signal.

[0074] Normal: Continuously monitors power status.

[0075] Continuous power status monitoring - Transmitter: Continuously monitors power and takes appropriate action when abnormalities occur.

[0076] Remote control transmitter: After the emergency signal transmission logic is triggered, it transmits control signals.

[0077] Transmit control signals: Send commands to the receiving end wirelessly.

[0078] Mode Selection - Receiver Section:

[0079] Four-position five-pin switch - receiver: As a component for selecting the function mode of the receiver, it has four function settings.

[0080] Step 1: System Shutdown: When selected, the receiver enters the system shutdown state and stops most functions.

[0081] Foot 2: Illuminated panel - remote control linkage: When selected, the receiver enters the linkage mode preparation state, ready to receive and respond to remote control signals.

[0082] Foot 3: Independent operation of the light-emitting panel: This position puts the receiver into an independent operation mode, and the light-emitting panel operates according to its own conditions.

[0083] Pin 4: System Shutdown: Same function as pin 1, causing the receiver to enter the system shutdown state.

[0084] Receiver section:

[0085] Remote control receiver: Receives control signals sent from the transmitter.

[0086] Determine if the signal matches - Receiver: Decodes and judges the received signal.

[0087] Yes: If the signal matches, control the LED light-emitting panel to operate.

[0088] No: If the signal does not match, no action will be taken.

[0089] Power supply - receiver: Provides power to the receiver circuit.

[0090] Charging boost module - receiver: Charges and boosts the power supply via the Type-C charging port.

[0091] Type-C charging port - receiver: Connects to an external power source to charge the power supply.

[0092] Low battery alarm module - receiver: Real-time monitoring of power supply level, alarming when power is low.

[0093] The above embodiments are merely illustrative of the concept and implementation of the present invention and are not intended to limit it. Under the concept of the present invention, technical solutions without substantial changes are still within the scope of protection.

Claims

1. A group-controllable emergency lighting system based on alternating magnetic field induction, characterized in that: It includes an alternating magnetic field induction module (1), an emergency lighting control module (2), a group control module (3), a power supply module (4), and a function switching switch (5); The alternating magnetic field sensing module (1) includes an inductor (10) and multiple transistors (11); the inductor (10) achieves the inductance effect by winding the detection circuit with insulated wire, and is used to continuously sense the alternating magnetic field signal in the surrounding environment and convert the magnetic field change into an electrical signal; the transistors (11) are used to amplify and process the electrical signal; The emergency lighting control module (2) includes a normally closed relay; the power supply circuit of the relay coil is controlled by the output state of the transistor (11); when the system is running normally and the power supply is normal, the relay coil is always energized, its normally closed contact remains closed, and the emergency lighting fixtures do not start; when a power interruption is detected, the output state of the transistor (11) changes, causing the normally closed contact of the relay to open, thereby triggering the emergency lighting fixtures to start; The group control module (3) includes a remote control switch (30), a signal receiver (31) and a signal transmitter (32). The signal transmitter (32) receives the trigger signal from the remote control switch (30) and sends out control signals at a preset frequency. Each emergency lighting control module (2) is equipped with a signal receiver (31) and receives the control signals sent by the corresponding signal transmitter (32). The power module (4) is used to continuously supply power to the alternating magnetic field induction module (1), the group control module (3) and the emergency lighting control module (2); The function switching switch (5) is a four-position five-pin switch used to control the group control operation and stop operation of the remote control; when in the light-emitting board-remote control joint operation mode, the control signal emitted by the signal transmitter (32) can be accurately received by the receiver (31) to realize the centralized control of multiple LED light-emitting boards; The inductor (10) is installed by wrapping an insulated wire around the mains power line to be monitored; the system includes a self-reset test button, which is in the off state when the system is in normal operation.

2. The group-controllable emergency lighting system based on alternating magnetic field induction according to claim 1, characterized in that: When the power supply is normal, the alternating magnetic field is in a stable state, and the inductor (10) can output a relatively stable electrical signal. When the power is interrupted, the alternating magnetic field will change accordingly, and the electrical signal output by the inductor (10) will continue to weaken until it disappears.

3. The group-controllable emergency lighting system based on alternating magnetic field induction according to claim 1, characterized in that: When the inductor (10) is manufactured, the number of winding turns is initially set to 3 to 5 turns; when the LED indicator in the sensing circuit is not lit or the brightness is insufficient, the number of coil turns is increased; when the LED in the sensing circuit is too bright, the number of coil turns is reduced; the inductor (10) is a coil wound on the line by insulated wire.

4. The group-controllable emergency lighting system based on alternating magnetic field induction according to claim 1, characterized in that: The signal transmitter (32) uses an encoding chip that operates at a fixed frequency, and its carrier frequency is selected as 315MHz or 433MHz; The signal receiver (31) employs a decoding chip that matches the encoding chip to receive and identify the control signal.

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