Two-bus communication repeater of fire-fighting emergency lighting and evacuation indication system

Abstract

The utility model discloses a two-bus communication repeater of a fire-fighting emergency lighting and evacuation indication system, which comprises an input circuit, a micro-control unit, an output circuit and a power supply circuit which are connected in sequence, wherein the power supply circuit is used for supplying power to the repeater; the power supply circuit comprises a power supply input, a rectification circuit, a filter circuit, a voltage stabilizing circuit and a power supply protection circuit. The input circuit comprises an input protection circuit, a signal receiving circuit, an input amplification circuit and a resistor circuit; the output circuit comprises an output protection circuit and an output amplification circuit. The fire-fighting emergency lighting and evacuation indication system two-bus communication repeater has the advantages of being ingenious in design, convenient to use, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the field of communication repeaters, in particular to a two-bus communication repeater for a fire emergency lighting and evacuation indication system. Background Art

[0002] In fire emergency lighting and evacuation indication systems, two-bus communication plays a variety of roles. It can be used to connect equipment and lighting, transmit and monitor data, detect faults and provide alarms, and implement intelligent control. This improves system stability and reliability, and is a crucial technical foundation for ensuring the efficient operation of fire emergency lighting and evacuation indication systems.

[0003] While two-bus communication offers advantages such as saving cables and simplifying construction, its direct communication distance is limited. When the system is large and fire emergency lighting and evacuation indication equipment is widely distributed, direct communication via the two-bus may not meet the needs of long-distance transmission. In this case, the use of a repeater can effectively extend the communication distance and ensure stable signal transmission. Furthermore, the signal may be affected by various factors, such as electromagnetic interference and line attenuation, resulting in degraded signal quality or even interruption. A repeater can amplify and shape the signal, restoring its strength and clarity, thereby improving the stability of signal transmission. Furthermore, in fire emergency lighting and evacuation indication systems, it is sometimes necessary to directly connect high-power electrical appliances, such as those requiring 1kW of power. Therefore, a two-bus communication repeater suitable for fire emergency lighting and evacuation indication systems is needed. Utility Model Content

[0004] In order to provide a two-bus communication repeater suitable for fire emergency lighting and evacuation indication system, the utility model designs a two-bus communication repeater with multi-stage protection, multi-stage amplification, and support for signal and high-power relay.

[0005] The utility model provides a two-bus communication repeater for a fire emergency lighting and evacuation indication system, comprising an input circuit, a micro control unit, an output circuit, and a power supply circuit connected in sequence; the power supply circuit comprises a power input, a rectifier circuit, a filter circuit, a voltage stabilizing circuit, and a power protection circuit; the input circuit comprises an input protection circuit, a signal receiving circuit, an input amplifying circuit, and a resistor circuit; and the output circuit comprises an output protection circuit and an output amplifying circuit.

[0006] Preferably, the voltage stabilizing circuit supports outputting regulated power supplies of different voltage levels.

[0007] Preferably, the output amplifier circuit uses a MOS tube (Metal-Oxide-Semiconductor) to amplify the signal.

[0008] Preferably, the output amplifier circuit is enhanced by a parallel MOS tube that supports high power.

[0009] Preferably, the output circuit further includes an output indication circuit for providing system operation status information or fault alarm.

[0010] Beneficial effects of the utility model:

[0011] 1) Amplifying the second bus signal extends the communication distance, improves signal stability, and enhances the reliability of the fire emergency lighting and evacuation indication system.

[0012] 2) In the input and output circuits, multi-stage amplification and multi-stage protection are used to improve signal strength and safety performance.

[0013] 3) Supports high-power relays, suitable for situations requiring high power exceeding 1kW, such as direct connection to lamps.

[0014] The utility model discloses a two-bus communication repeater for a fire emergency lighting and evacuation indication system, which has the characteristics of clever design, convenient use, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a circuit block diagram of a two-bus communication repeater for a fire emergency lighting and evacuation indication system according to an embodiment of the present utility model;

[0016] Figure 2 This is a power supply circuit diagram of a two-bus communication repeater of a fire emergency lighting and evacuation indication system according to an embodiment of the present utility model;

[0017] Figure 3 This is an input circuit diagram of a two-bus communication repeater for a fire emergency lighting and evacuation indication system according to an embodiment of the present utility model;

[0018] Figure 4 This is a pin diagram of the MCU of a two-bus communication repeater for a fire emergency lighting and evacuation indication system according to an embodiment of the present utility model;

[0019] Figure 5 This is an output circuit diagram of a two-bus communication repeater of a fire emergency lighting and evacuation indication system according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0020] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0021] The present invention provides a two-bus communication repeater for fire emergency lighting and evacuation indication system, such as Figure 1 As shown, it includes a power supply circuit, an input circuit, an MCU (Micro-controller Unit), and an output circuit.

[0022] Power circuit such as Figure 2 As shown, it provides stable operating voltage and current for the entire repeater, ensuring the normal operation of the repeater and outputting regulated power supplies of different voltage levels. The power supply circuit usually includes rectification, filtering, and voltage stabilization to ensure the stability of the output voltage and a small ripple factor. The power supply circuit includes the following parts:

[0023] 1) Power input. Receives electrical energy from an external power source and is the starting point of the power circuit.

[0024] 2) Rectifier circuit. When AC power is input, the rectifier circuit converts it to DC power. Rectifier circuits can be composed of components such as diodes or rectifier bridges.

[0025] 3) Filter circuit. This circuit removes ripples from the rectified DC power, making the output voltage smoother and more stable. It can be composed of components such as capacitors and inductors.

[0026] 4) Voltage stabilization circuit. Keep the output voltage stable within a certain range and not be affected by input voltage fluctuations and load changes. The voltage stabilization circuit may use different forms of voltage stabilization components such as linear regulators and switching regulators. In addition, voltage division can be used to output regulated power supplies of different voltage levels. For example, Figure 2 DC5V and DC12V power supplies are available to meet the voltage requirements of different connections.

[0027] 2) Rectifier circuit. When AC power is input, the rectifier circuit converts it to DC power. Rectifier circuits can be composed of components such as diodes or rectifier bridges.

[0028] 3) Filter circuit. This circuit removes ripples from the rectified DC power, making the output voltage smoother and more stable. It can be composed of components such as capacitors and inductors.

[0029] 4) Voltage stabilization circuit. Keep the output voltage stable within a certain range and not be affected by input voltage fluctuations and load changes. The voltage stabilization circuit may use different forms of voltage stabilization components such as linear regulators and switching regulators. In addition, voltage division can be used to output regulated power supplies of different voltage levels. For example, Figure 2 DC5V and DC12V power supplies are available to meet the voltage requirements of different connections.

[0030] 5) Power protection circuit. Protects the power supply circuit and subsequent circuits from abnormal conditions such as overcurrent, overvoltage, and short circuit. Components such as fuses, thermistors, and overvoltage protection diodes can be used.

[0031] Input circuit such as Figure 3 As shown, the circuit receives signals from upstream devices, such as fire emergency lighting controllers or fire alarm systems. These signals may be digital or analog and are used for control or information transmission. The input circuit must have a certain degree of anti-interference capability to ensure accurate signal transmission.

[0032] The input circuit consists of the following parts:

[0033] 1) Input protection circuit. This circuit primarily protects the entire repeater circuit from damage caused by external abnormal signals such as overvoltage and overcurrent. Current-limiting components (such as fuses) and surge suppressors (such as varistors and gas discharge tubes) can be used. These components can quickly respond to abnormal conditions, limiting current or voltage to a safe range, thereby protecting subsequent circuits from damage.

[0034] 2) Signal receiving circuit: This circuit is responsible for receiving communication signals from upstream devices (such as emergency lighting controllers). The signal receiving circuit receives the signal through an appropriate interface, such as differential input or single-ended input, and converts it to a level or format that can be processed by the internal circuitry.

[0035] 3) Input amplifier circuit: The input amplifier circuit amplifies the received signal so that the subsequent circuit can accurately process or transmit it.

[0036] 4) Resistor Circuits: Resistors can be used for signal voltage division and current limiting, matching impedances between circuits and reducing signal reflections and interference. They can also be used for circuit biasing and feedback to improve circuit performance and stability. During signal amplification, they can also serve as feedback elements to control the amplifier's gain and stability.

[0037] The pins of the MCU microcontroller unit are as follows: Figure 4 As shown in the figure, the core processing unit of the repeater is responsible for processing the signals received by the input circuit and making judgments and decisions based on preset programs or logic. The MCU can control the output circuit to operate in a predetermined manner, such as controlling the lighting of emergency lighting fixtures or adjusting the direction of evacuation indicators. For example, the MCU can use the BJBUSHX chip model. Table 1 shows an example of the MCU pinout.

[0038] Table 1 MCU pin connection example

[0039] .

[0040] Output circuit such as Figure 5 As shown, the signal processed by the MCU is converted into a control signal or drive signal and output to downstream devices, such as emergency lighting fixtures and evacuation indicator lights. The output circuit needs to have a certain driving capability to ensure that it can drive the downstream devices to work properly.

[0041] The output circuit consists of the following parts:

[0042] 1) Output protection circuit: This circuit protects connected loads, such as emergency lighting fixtures and evacuation signs, as well as the relay itself, from damage caused by abnormal conditions such as short circuits, overloads, and overvoltages. It monitors output current, voltage, and other parameters. Once an abnormality is detected, it quickly takes action, such as shutting off the output or limiting the current, to protect the circuit and load.

[0043] 2) Output amplifier circuit: It can amplify the control signal processed by MCU again to meet the current and voltage requirements of the load. Figure 5 In the circuit, VT1 uses a MOS transistor (Metal-Oxide-Semiconductor) for signal amplification. In fire emergency lighting and evacuation signage systems, in some cases, the output amplifier circuit must have sufficient drive capability and stability to ensure the proper functioning of all loads, as a large number of emergency lighting fixtures and evacuation signs must be controlled. In such cases, parallel MOS transistors can be used in VT1's place. Connecting multiple MOS transistors in parallel enhances the circuit's overall performance and current-carrying capacity, enabling support for high-power scenarios exceeding 1kW.

[0044] 3) Output indicator circuit: This circuit provides system operating status information or fault alarms. LED indicators and LCD screens can display the relay's operating status, such as normal, faulty, or standby, as well as the output circuit's operating status, such as whether current is output and whether the output voltage is normal. This is crucial for fire emergency lighting and evacuation indicator system maintenance and management personnel, as it helps them quickly understand the system's current status and take appropriate action.

[0045] The above embodiments are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A two-bus communication repeater for fire emergency lighting and evacuation indication system, characterized in that: It includes an input circuit, a micro control unit, an output circuit connected in sequence, and a power supply circuit that provides power to the repeater; the power supply circuit includes a power input, a rectifier circuit, a filter circuit, a voltage stabilization circuit and a power protection circuit; the input circuit includes an input protection circuit, a signal receiving circuit, an input amplification circuit and a resistor circuit; the output circuit includes an output protection circuit and an output amplification circuit.

2. A fire emergency lighting and evacuation indication system two-bus communication repeater according to claim 1, characterized in that: The voltage stabilizing circuit supports outputting regulated power supplies of different voltage levels.

3. A fire emergency lighting and evacuation indication system two-bus communication repeater according to claim 1, characterized in that: The output amplifier circuit uses a MOS tube (Metal-Oxide-Semiconductor) to amplify the signal.

4. A two-bus communication repeater for fire emergency lighting and evacuation indication system according to claim 3, characterized in that: The output amplifier circuit is enhanced by parallel MOS tubes supporting high power.

5. A two-bus communication repeater for fire emergency lighting and evacuation indication system according to any one of claims 1 to 4, characterized in that: The output circuit also includes an output indication circuit for providing system operation status information or fault alarm.

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