CN219761398U - Low-voltage direct-current carrier communication circuit applied to fire emergency lighting system - Google Patents
Low-voltage direct-current carrier communication circuit applied to fire emergency lighting system Download PDFInfo
- Publication number
- CN219761398U CN219761398U CN202320218870.0U CN202320218870U CN219761398U CN 219761398 U CN219761398 U CN 219761398U CN 202320218870 U CN202320218870 U CN 202320218870U CN 219761398 U CN219761398 U CN 219761398U
- Authority
- CN
- China
- Prior art keywords
- carrier
- circuit
- voltage
- emergency lighting
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004891 communication Methods 0.000 title claims abstract description 49
- 230000008859 change Effects 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 claims description 44
- 238000010168 coupling process Methods 0.000 claims description 44
- 238000005859 coupling reaction Methods 0.000 claims description 44
- 238000002955 isolation Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 12
- 239000011324 bead Substances 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 9
- 230000000087 stabilizing effect Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000002054 transplantation Methods 0.000 description 1
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to a low-voltage direct current carrier communication circuit applied to a fire emergency lighting system, which comprises a bus control module and an emergency lighting lamp control module, wherein the bus control module is used as a host, and the emergency lighting lamp control module is used as a slave; the host modulates the control signal sent by the upper computer into a low-voltage direct-current carrier signal according to a signal change rule through an internal circuit of the host and sends the low-voltage direct-current carrier signal to the power bus, and the slave receives and responds the low-voltage direct-current carrier signal and controls and monitors the state of the emergency lighting lamp through the internal circuit of the slave. The utility model realizes power supply and communication on two wires simultaneously, can ensure lower error rate while reducing construction cost and complexity, and ensures higher power supply quality in an effective power supply range.
Description
Technical Field
The utility model belongs to the technical field of low-voltage power carrier communication, and particularly relates to a low-voltage direct-current carrier communication circuit applied to a fire emergency lighting system.
Background
With the development of economy in China, a fire emergency lighting system plays an increasingly important role in a plurality of personnel-intensive buildings, a low-voltage direct current power supply circuit is needed between a master machine and a slave machine of a traditional fire emergency lighting system, a communication circuit is needed, construction cost and difficulty are high, and the technical problems of excessively low voltage drop at the tail end of the circuit, circuit impedance matching and the like exist.
The carrier communication is a technology for reliably transmitting analog or digital signals by utilizing the existing power line in a carrier mode, the current mainstream carrier communication technology comprises a power line carrier and a direct current carrier, the power line carrier is mainly used for a medium-high voltage power line and a low-voltage distribution line, and emergency lighting lamps in a fire emergency lighting system are all low-voltage direct current power supply and belong to the direct current carrier. The direct current carrier technology is to raise the level of logic 0 and logic 1 during communication, so that a certain voltage is provided on the communication line no matter the level is logic 0 or logic 1, and the normal power supply of the fire emergency lamp is ensured.
In addition, the power supply and the communication line have impedance, so the power supply process has line loss, the size of the line loss is related to the load of the line, and in addition, the communication error code is caused by external electromagnetic interference or fluctuation of the voltage on the line; in summary, the design of low-voltage direct current power line carrier communication should consider: on the premise of ensuring the reliability and safety of communication, the carrier coupling characteristic is improved; when the carrier transmission power line is long enough, the requirement of attenuation of the working environment needs to be met; the existing layout environment of the power line is not damaged, and the installation is realized simply and conveniently as much as possible.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a low-voltage direct current carrier communication circuit applied to a fire emergency lighting system, which can realize power supply and communication on two wires simultaneously, can reduce construction cost and complexity, simultaneously ensure lower error rate and ensure higher power supply quality in an effective power supply range.
In order to solve the technical problems, the low-voltage direct-current carrier communication circuit applied to the fire emergency lighting system comprises a bus control module and a plurality of emergency lighting lamp control modules; the bus control module comprises a carrier chip circuit and a carrier coupling circuit, wherein the carrier chip circuit converts a received upper computer control signal into an MOS tube driving signal and a bus driving signal, and the carrier coupling circuit couples direct current carrier voltage carrying control information to the power bus; the emergency lighting lamp control module comprises a carrier signal receiving and transmitting circuit and an emergency lighting lamp microcontroller; the carrier signal receiving and transmitting circuit demodulates the direct current carrier voltage on the power bus into a voltage control signal and sends the voltage control signal to the emergency lighting lamp microcontroller, and the emergency lighting lamp microcontroller controls the on and off of the lamp beads in the emergency lighting lamp according to the voltage control signal.
Further, the bus control module also comprises a serial port signal isolation circuit; the control signal output by the serial port signal receiving and transmitting port of the upper computer is coupled to the serial port of the carrier chip circuit through the serial port signal isolation circuit.
The carrier chip circuit also demodulates the return signal received by the carrier coupling circuit from the power bus, and then the return signal is transmitted back to the upper computer through the serial port signal isolation circuit.
The carrier coupling circuit comprises a MOSFET power element Q21, a first carrier voltage coupling triode Q22 and a second carrier voltage coupling triode Q23; after the MOS tube driving signal sent by the carrier coupling circuit controls the MOSFET power element Q21 to be conducted, the bus driving signal drives the first carrier voltage coupling triode Q22 and the second carrier voltage coupling triode Q23 to be conducted alternately, and direct-current carrier voltage carrying control information is coupled to the power bus.
Further, the bus control module also comprises a power supply circuit; the +24V direct current power supply is connected to the power supply circuit through the 20A fuse, one path is connected to the carrier coupling circuit as carrier voltage, and the other path is converted into +12V direct current and +3.3V direct current; the +12V direct current is used as the reference voltage of the upper computer control signal receiving and transmitting end of the serial port signal isolation circuit and the reference voltage of the carrier chip circuit; the +3.3V direct current is used as the power supply voltage of the carrier chip circuit and the reference voltage of the serial port receiving and transmitting end of the carrier chip circuit of the serial port signal isolation circuit.
Further, the bus control module also comprises a status indicator lamp circuit, wherein the status indicator lamp circuit is connected with the serial port signal isolation circuit and the carrier chip circuit, and displays the data receiving and transmitting state between the serial port signal isolation circuit and the upper computer and the power supply state of the carrier chip circuit.
Further, the emergency lighting lamp control module also comprises a carrier port access circuit, wherein the carrier port access circuit comprises a TVS unidirectional diode and a rectifier bridge, the two power buses are respectively connected with two ends of the TVS unidirectional diode, the anode of the TVS unidirectional diode is connected to the rectifier bridge, and the direct current carrier voltage output by the rectifier bridge is connected to the carrier signal receiving and transmitting circuit.
The carrier signal receiving and transmitting circuit comprises a voltage dividing circuit and a carrier data receiving device Q41; the direct current carrier voltage is divided by the voltage dividing circuit and then connected to the base electrode of the carrier data receiving device Q41 as a control signal thereof, so that the direct current carrier voltage is conducted and cut off according to the change rule of the carrier signal, a 0-5V level signal is led out from the emitter electrode of the carrier data receiving device Q41 and led to the emergency lighting lamp microcontroller through the PI port, and the emergency lighting lamp microcontroller controls the on and off of the lamp.
The carrier signal receiving and transmitting circuit also comprises a carrier data transmitting device Q42, and response data of the emergency lighting lamp microcontroller is used as a control signal of the carrier data transmitting device Q42 to control on-off of the carrier data transmitting device Q42, so that the response data is modulated onto the power bus.
Further, the emergency lighting lamp control module also comprises a lamp control and fault detection circuit; the lamp control and fault detection circuit comprises a lamp state control device Q5; the control signal output by the emergency lighting lamp microcontroller is used as the control signal of the lamp state control device Q5 to control the on-off of the lamp state control device Q5, so that the lamp connected with the collector electrode of the lamp state control device Q5 is controlled to be turned on or off; the lamp status signal is output by the emitter of the lamp status control device Q5.
The utility model has the following beneficial effects:
1. the low-voltage direct-current carrier technology is applied to the fire emergency lighting system, so that the nonpolar power supply and communication of the emergency lighting lamp on two wires are realized, the construction cost and difficulty are greatly reduced, and the later maintenance is facilitated;
2. the full-amplitude voltage transmission of the data is realized, the current signal is transmitted back, the data transmission is reliable, the anti-interference performance is strong, and the transmission distance is long;
3. the power supply voltage can reach direct current +48V, the full load current can reach 20A, the carrying capacity is strong, and the power supply quality is ensured;
4. the emergency lighting lamp control module realizes the self-checking and local alarm of lamp faults, and the communication function is automatically recovered after the faults are removed.
Drawings
Fig. 1 is a general block diagram of the present utility model.
Fig. 2 is a block diagram of a bus control module.
Fig. 3 is a serial port signal isolation circuit diagram.
Fig. 4 is a carrier coupling circuit diagram.
Fig. 5 is a block diagram of an emergency lighting fixture control module.
Fig. 6 is a carrier port access circuit diagram.
Fig. 7 is a circuit diagram of a carrier signal transceiver.
Fig. 8 is a circuit diagram of lamp control and fault detection.
Detailed Description
The present utility model will now be described in further detail with reference to the drawings and examples, it being understood that the specific examples described herein are intended to illustrate the utility model only and are not intended to be limiting. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the above terms in the present utility model can be understood in detail by those skilled in the art.
The utility model utilizes the characteristics of low-voltage direct current carrier communication technology to integrate the power supply circuit and the communication circuit, namely, the two wires realize the communication and power supply functions, so that the construction cable cost can be saved, great convenience is brought to site construction and later maintenance, and the characteristics of the low-voltage direct current carrier communication can effectively solve the problems of power supply voltage drop and communication impedance matching.
The utility model provides a low-voltage direct current carrier communication circuit applied to a fire emergency lighting system based on a low-voltage direct current carrier principle. Because the working voltage of the emergency lighting lamp is generally within 48V, the limitation and restriction of the over-high voltage on the whole loop voltage-resistant device are avoided, and meanwhile, the direct-current carrier wave has high flexibility, so that the direct-current coupling mode is adopted for coupling the power carrier wave signal and the power bus.
As shown in fig. 1, the low-voltage direct-current carrier communication circuit applied to the fire emergency lighting system comprises a bus control module and a plurality of emergency lighting lamp control modules. The bus control module is used as a host, and the emergency lighting lamp control module is used as a slave; the host modulates the control signal sent by the upper computer into a low-voltage direct-current carrier signal according to a signal change rule through an internal circuit of the host and sends the low-voltage direct-current carrier signal to the power bus, and the slave receives and responds the low-voltage direct-current carrier signal and controls and monitors the state of the emergency lighting lamp through the internal circuit of the slave. The upper computer is a computer in the existing emergency lighting centralized power supply.
As shown in fig. 2, the bus control module includes a serial port signal isolation circuit, a carrier chip circuit, a power supply circuit, a carrier coupling circuit, and a status indicator lamp circuit.
Serial port signal isolation circuit: a commercially available optocoupler isolation chip EL817 may be used, and its internal circuit is shown in fig. 3; control signals output by the serial port signal receiving and transmitting port of the upper computer pass through the port RX in Input via port RX out Outputs to the carrier chip circuit, and the signal returned by the carrier chip circuit passes through TX in Input via port TX out And the signal is returned to the serial port signal receiving and transmitting port of the upper computer, so that photoelectric coupling among communication interfaces with different voltage levels is realized to avoid signal crosstalk.
Carrier chip circuit: and a PB620 carrier chip is adopted, a serial port of the PB620 carrier chip receives an upper computer control signal through a serial port signal isolation circuit, outputs an MOS tube driving signal and a bus driving signal, and sends the MOS tube driving signal and the bus driving signal to a carrier coupling circuit. Or demodulating the return signal received by the carrier coupling circuit from the power bus, and then transmitting the return signal back to the upper computer through the serial port signal isolation circuit to realize the conversion between the serial port signal and the direct current carrier voltage between the emergency lighting lamp module and the upper computer.
And a power supply circuit: the commercial power supply chip LM2575HVS-12 and HT7133 can be adopted; the internal circuit of the power supply comprises two low-power consumption voltage stabilizing chips A, B, wherein +24V direct current is connected into a power supply circuit through a 20A fuse, one path of the direct current is used as carrier voltage to be connected into a carrier coupling circuit, and the other path of the direct current is connected into a voltage stabilizing chip A; the voltage stabilizing chip A reduces +24V to +12V, and +12V is reduced to +3.3V through the voltage stabilizing chip B. One path of the +12V direct current source provides reference voltage for the receiving and transmitting end of the upper computer of the serial port signal isolation circuit, and the other path provides reference voltage for the carrier chip circuit; one path of the +3.3V direct current source supplies power for the status indicator lamp circuit, the other path supplies power for the PB620 carrier chip, and the other path supplies reference voltage for the serial port receiving and transmitting end of the carrier chip circuit of the serial port signal isolation circuit.
Carrier coupling circuit: the carrier coupling circuit selects a P-channel medium-voltage high-current MOSFET power element, so that the power supply quality of the emergency lighting lamp is ensured, and as shown in fig. 4, the carrier coupling circuit comprises a MOSFET power element Q21, a current limiting resistor R23, a first carrier voltage coupling triode Q22, a current limiting resistor R22, a second carrier voltage coupling triode Q23, a pull-down resistor R21 and a voltage stabilizing tube D2; after the MOS tube driving signal sent by the carrier coupling circuit controls the MOSFET power element Q21 to be conducted, the bus driving signal drives the first carrier voltage coupling triode Q22 and the second carrier voltage coupling triode Q23 to be conducted alternately along with the change of the height, and the direct current carrier voltage carrying control information is coupled to the power bus.
Status indicator light circuit: three status signals are accessed from the carrier chip circuit and the serial port signal isolation circuit so as to display the power supply status of the carrier chip circuit, the data receiving and transmitting status between the serial port signal isolation circuit and the upper computer and the power bus fault indication. The status indicator light circuit may employ status indicator light circuits in existing emergency lighting fixture control circuits.
As shown in fig. 5, the emergency lighting lamp control module includes a carrier port access circuit, a carrier signal transceiver circuit, a power conversion circuit, a lamp control and fault detection circuit, and an emergency lighting lamp microcontroller.
Carrier port access circuitry: the power bus interface of the emergency lighting lamp module adopts a combined circuit of a TVS unidirectional diode and a rectifier bridge to provide port protection for the emergency lighting lamp control module and prevent surge transient impact. As shown in fig. 6, the TVS unidirectional diode D31 is connected in parallel with the power bus through the fuse F3 and is connected to the rectifier bridge D32, so that the received dc carrier voltage and the emergency lighting lamp control module are commonly grounded, and a non-polar connection of the power bus is realized (the power of two wires is not connected in reverse, and the carrier port access circuit can correctly output); and outputting the DC carrier voltage with the amplitude of +24V, and connecting the DC carrier voltage to a carrier signal receiving and transmitting circuit.
Carrier signal receiving and transmitting circuit: the direct current carrier voltage with the amplitude of +24V output by the carrier port access circuit is divided, the amplitude is pulled down to +6V, the direct current carrier voltage is connected to the control end of the switching device, the switching device is controlled to be switched on and off according to the high-low level change of the direct current carrier voltage with the amplitude of +6V, the current change is converted into a voltage control signal through the grounding resistor R54, and the voltage control signal is sent to the emergency lighting lamp microcontroller. When the emergency lighting lamp microcontroller returns lamp state data to the upper computer, the lamp state data output by the emergency lighting lamp microcontroller is transmitted to the power bus through the carrier port access circuit by the transmitting loop.
A power conversion circuit: the commercial high-efficiency buck DC/DC voltage stabilizing chip HT7463B is adopted, the +24V direct current carrier voltage output by the carrier signal receiving and transmitting circuit through the protection isolation diode D5 is connected to the voltage stabilizing chip of the power supply conversion circuit, the voltage stabilizing chip outputs +5V voltage, one path supplies power to the lamp, the other path provides working power for the emergency lighting lamp microcontroller, and the other path serves as the reference voltage of the carrier signal receiving and transmitting circuit.
Lamp control and fault detection circuit: the lamp work is powered by +5V, and the normally-on state, the off state and the flickering state of the emergency lighting lamp are controlled by a lamp control pin of the emergency lighting lamp microcontroller; meanwhile, the emergency lighting lamp microcontroller continuously scans the state port of the emergency lighting lamp, the level of the state port is different from the output voltage of the emergency lighting lamp when the lamp is in a short circuit or an open circuit, and the emergency lighting lamp microcontroller updates the state data of the emergency lighting lamp through the lamp control pins and the level of the state port. The lamp control and fault detection circuit adopts the lamp control and fault detection circuit in the existing emergency lighting lamp control circuit.
Emergency lighting fixture microcontroller: the 8-bit low-power-consumption microcontroller is selected, and the emergency lighting lamp microcontroller controls the working state of the emergency lighting lamp according to the demodulated voltage control signal and detects the working state of the lamp through the state port. The function pins comprise two signal receiving and transmitting pins connected with the carrier receiving and transmitting circuit, an output pin connected with the lamp control and fault detection circuit and used for controlling the lamp to be turned on and off, and a lamp state input pin.
As shown in fig. 7, the carrier signal transceiving circuit includes a voltage dividing circuit, a carrier data receiving device Q41, and a carrier data transmitting device Q42; one path of direct current carrier voltage output by the carrier port access circuit is connected to a voltage stabilizing chip of the power supply conversion circuit through an isolation device D4, and the other path of direct current carrier voltage is divided through voltage dividing resistors R41 and R42; the current limiting resistor R43 and the filter capacitor C4 are connected to the base electrode of the carrier data receiving device Q41 to serve as control signals, the +5V voltage VCC output by the power supply conversion circuit is used as reference voltage to be connected to the collector electrode of the carrier data receiving device Q41, the carrier data receiving device Q41 is controlled to output according to the change rule of the carrier signal, the pull-down resistor R44 is used for obtaining signals with the amplitude of +5V, and the signals are led to the emergency lighting lamp microcontroller through the PI port; the lamp state signal returned by the emergency lighting lamp microcontroller is connected to the base control end of the carrier data transmitting device Q42 through the current limiting resistor R46, and the lamp state signal is modulated onto the power bus by controlling the on-off of the carrier data transmitting device Q42.
Preferably, as shown in fig. 8, the +5v voltage VCC output by the power supply conversion circuit of the lamp control and fault detection circuit is connected to the anode of the lamp bead through the current limiting resistors R51-R54, the cathode of the lamp bead is connected to the collector of the lamp state control device Q5, and the base control end of the lamp state control device Q5 is connected to the lamp control pin of the emergency lighting lamp microcontroller through the current limiting resistor R55, so that the lamp bead is controlled to turn on, off and flash through the emergency lighting lamp microcontroller; the working current is monitored through a pull-down resistor R56, a current signal is converted into a voltage signal, the voltage signal is led out through an emitter of a lamp state control device Q5 and is connected to an emergency lighting lamp state monitoring pin of the microcontroller; finally, the lamp state data is stored in the software layer by reading the potentials of the lamp control pins and the emergency lighting lamp state monitoring pins and combining a finite state machine.
In the embodiment of the utility model, data receiving and transmitting tests are carried out, and the upper computer and the emergency lighting lamp control module adopt a Modbus protocol to communicate with each other at 2400 baud rate. The oscilloscope is used for capturing address bit data of a section of lamp state data frame sent by the upper computer and starting bit data of a section of lamp state data frame returned by the emergency lighting lamp microcontroller. The CH1 waveform is a serial port signal waveform between the upper computer and the bus control module, and the CH2 waveform is a modulated direct current carrier voltage waveform. From the waveform diagram, the DC carrier voltage generates voltage amplitude change according to the serial port signal change rule, the high level corresponds to wider voltage amplitude, and the low level corresponds to narrower voltage amplitude. Limited by the test conditions, CH1 and CH2 have a delay of about 2ms, but can be ignored. The test shows that the system can establish normal communication, and the emergency lighting lamp control module can timely and accurately send and receive data.
The embodiment of the utility model is subjected to error rate test, 1000 read state data frames are continuously sent at intervals of 500ms, and the error rate formula is adopted:
statistics show that the communication error rate is lower than 0.01%, and the communication quality of the communication line is effectively verified.
Through example tests, the utility model has the following effects:
1. the low-voltage direct-current carrier technology is applied to the fire emergency lighting system, so that the nonpolar power supply and communication of the emergency lighting lamp on two wires are realized, the construction cost and difficulty are greatly reduced, and the later maintenance is facilitated;
2. the full-amplitude voltage transmission of the data is realized, the current signal is transmitted back, the data transmission is reliable, the anti-interference performance is strong, and the transmission distance is long;
3. the method supports various software communication protocols, is convenient for technology transplantation, and is easy to realize integration of different systems;
4. the power supply voltage can reach direct current +48V, the full load current can reach 20A, the carrying capacity is strong, and the power supply quality is ensured;
5. the emergency lighting lamp control module realizes fault self-detection and local alarm of the emergency lighting lamp, and the communication function is automatically recovered after the fault is removed.
At present, the application of a mature low-voltage direct current carrier coupling mode is capacitive coupling and inductive coupling, and because the direct coupling has some problems in the aspects of voltage resistance, safety and the like, the low-voltage direct current carrier coupling mode can be applied to the low-voltage direct current carrier communication of a fire emergency lighting system in few cases, the low-voltage direct current carrier communication is generally within 48V, the limitation and restriction of the whole loop voltage-resistant device caused by the over-high voltage are avoided, and meanwhile, the direct coupling mode is adopted for the coupling between a voltage carrier signal and a power line according to the characteristic of high flexibility of the direct current carrier; the TVS unidirectional diode D31 is connected in parallel with the power bus through the fuse F3 and is connected to the rectifier bridge D32, and the received carrier signal and the emergency lighting lamp control module are commonly grounded, so that the nonpolar wiring of the power bus is realized (the two wire buses are connected in reverse, and the carrier port access circuit can correctly output); the DC carrier voltage with the amplitude of +24V is output and connected to the carrier signal receiving and transmitting circuit.
In summary, the application of the low-voltage direct-current carrier communication technology in the fire emergency lighting system has a larger cost advantage than the traditional scheme under the condition of equivalent communication quality and power supply reliability, and the technical scheme of the utility model is not limited to the application of the fire emergency lighting system.
Claims (10)
1. The low-voltage direct-current carrier communication circuit applied to the fire emergency lighting system is characterized by comprising a bus control module and a plurality of emergency lighting lamp control modules; the bus control module comprises a carrier chip circuit and a carrier coupling circuit, wherein the carrier chip circuit converts a received upper computer control signal into an MOS tube driving signal and a bus driving signal, and the carrier coupling circuit couples direct current carrier voltage carrying control information to the power bus; the emergency lighting lamp control module comprises a carrier signal receiving and transmitting circuit and an emergency lighting lamp microcontroller; the carrier signal receiving and transmitting circuit demodulates the direct current carrier voltage on the power bus into a voltage control signal and sends the voltage control signal to the emergency lighting lamp microcontroller, and the emergency lighting lamp microcontroller controls the on and off of the lamp beads in the emergency lighting lamp according to the voltage control signal.
2. The low-voltage direct current carrier communication circuit applied to the fire emergency lighting system according to claim 1, wherein the bus control module further comprises a serial port signal isolation circuit; the control signal output by the serial port signal receiving and transmitting port of the upper computer is coupled to the serial port of the carrier chip circuit through the serial port signal isolation circuit.
3. The low-voltage direct current carrier communication circuit applied to the fire emergency lighting system according to claim 2, wherein the carrier chip circuit further demodulates a return signal received by the carrier coupling circuit from the power bus and transmits the return signal back to the upper computer through the serial port signal isolation circuit.
4. The low-voltage direct-current carrier communication circuit applied to the fire emergency lighting system according to claim 1, wherein the carrier coupling circuit comprises a MOSFET power element Q21, a first carrier voltage coupling triode Q22 and a second carrier voltage coupling triode Q23; after the MOS tube driving signal sent by the carrier coupling circuit controls the MOSFET power element Q21 to be conducted, the bus driving signal drives the first carrier voltage coupling triode Q22 and the second carrier voltage coupling triode Q23 to be conducted alternately, and direct-current carrier voltage carrying control information is coupled to the power bus.
5. The low-voltage direct current carrier communication circuit applied to the fire emergency lighting system according to claim 2, wherein the bus control module further comprises a power supply circuit; the +24V direct current power supply is connected to the power supply circuit through the 20A fuse, one path is connected to the carrier coupling circuit as carrier voltage, and the other path is converted into +12V direct current and +3.3V direct current; the +12V direct current is used as the reference voltage of the upper computer control signal receiving and transmitting end of the serial port signal isolation circuit and the reference voltage of the carrier chip circuit; the +3.3V direct current is used as the power supply voltage of the carrier chip circuit and the reference voltage of the serial port receiving and transmitting end of the carrier chip circuit of the serial port signal isolation circuit.
6. The low-voltage direct current carrier communication circuit applied to the fire emergency lighting system according to claim 2, wherein the bus control module further comprises a status indicator lamp circuit, the status indicator lamp circuit is connected with the serial port signal isolation circuit and the carrier chip circuit, and the status of data receiving and transmitting between the serial port signal isolation circuit and the upper computer and the status of the power supply of the carrier chip circuit are displayed.
7. The low-voltage direct current carrier communication circuit applied to the fire emergency lighting system according to claim 1, wherein the emergency lighting lamp control module further comprises a carrier port access circuit, the carrier port access circuit comprises a TVS unidirectional diode and a rectifier bridge, the two power buses are respectively connected with two ends of the TVS unidirectional diode, the positive electrode of the TVS unidirectional diode is connected to the rectifier bridge, and the direct current carrier voltage output by the rectifier bridge is connected to the carrier signal receiving and transmitting circuit.
8. The low-voltage direct current carrier communication circuit applied to the fire emergency lighting system according to claim 1, wherein the carrier signal receiving and transmitting circuit comprises a voltage dividing circuit and a carrier data receiving device Q41; the direct current carrier voltage is divided by the voltage dividing circuit and then connected to the base electrode of the carrier data receiving device Q41 as a control signal thereof, so that the direct current carrier voltage is switched on and off according to the change rule of the carrier signal, a 0-5V voltage control signal is led out from the emitter electrode of the carrier signal Q41, and then led to the emergency lighting lamp microcontroller through the PI port, and the emergency lighting lamp microcontroller controls the on and off of the lamp.
9. The low-voltage direct current carrier communication circuit applied to the fire emergency lighting system according to claim 8, wherein the carrier signal transceiver circuit further comprises a carrier data transmitting device Q42, and response data of the emergency lighting lamp microcontroller is used as a control signal of the carrier data transmitting device Q42 to control on-off of the carrier data transmitting device Q42, so that the response data is modulated onto the power bus.
10. The low-voltage direct current carrier communication circuit applied to the fire emergency lighting system according to claim 1, wherein the emergency lighting lamp control module further comprises a lamp control and fault detection circuit; the lamp control and fault detection circuit comprises a lamp state control device Q5; the control signal output by the emergency lighting lamp microcontroller is used as the control signal of the lamp state control device Q5 to control the on-off of the lamp state control device Q5, so that the lamp connected with the collector electrode of the lamp state control device Q5 is controlled to be turned on or off; the lamp status signal is output by the emitter of the lamp status control device Q5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320218870.0U CN219761398U (en) | 2023-02-15 | 2023-02-15 | Low-voltage direct-current carrier communication circuit applied to fire emergency lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320218870.0U CN219761398U (en) | 2023-02-15 | 2023-02-15 | Low-voltage direct-current carrier communication circuit applied to fire emergency lighting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219761398U true CN219761398U (en) | 2023-09-26 |
Family
ID=88075632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320218870.0U Active CN219761398U (en) | 2023-02-15 | 2023-02-15 | Low-voltage direct-current carrier communication circuit applied to fire emergency lighting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219761398U (en) |
-
2023
- 2023-02-15 CN CN202320218870.0U patent/CN219761398U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109291948B (en) | Intelligent control system for lighting of passenger room of rail transit | |
| CN219761398U (en) | Low-voltage direct-current carrier communication circuit applied to fire emergency lighting system | |
| CN208766506U (en) | A kind of and machine CAN build-out resistor automatic identification circuit and CAN and machine equipment | |
| CN216649530U (en) | Information acquisition remote communication terminal | |
| CN214663926U (en) | Street lamp of Hi-POE power supply | |
| CN211319035U (en) | Multi-motor polling control device of liquid cooling equipment | |
| CN115309683A (en) | Serial port self-adaptive switching circuit and communication equipment | |
| CN210323836U (en) | PLC system based on Arduino | |
| CN210348769U (en) | Manual alarm system | |
| CN218446431U (en) | ATC test system for railway vehicle | |
| CN219857167U (en) | Vehicle-mounted equipment running state monitoring system | |
| CN220087304U (en) | Vehicle-mounted Ethernet communication plug-in unit | |
| CN110943761A (en) | Remote power line carrier device with relay | |
| CN221615089U (en) | Portable gigabit multifunctional testing device | |
| CN217825020U (en) | Wiegand protocol conversion controller | |
| CN113098543B (en) | Two-wire system multiplexing circuit | |
| CN219041798U (en) | Automatic drive-by-wire gateway system and gateway equipment | |
| CN216565446U (en) | Circuit of switch | |
| CN116701286B (en) | On-line switching system for RS485 communication | |
| CN221042892U (en) | Digital bus communication equipment | |
| CN104519623A (en) | Transmission system based on DALI (digital addressable lighting interface) protocol control commands | |
| CN212569078U (en) | Detection circuit of DMX512 differential signal without signal ground wire | |
| CN219577265U (en) | Full-automatic data conversion unit | |
| CN221708096U (en) | High-speed bus interface cache recorder | |
| CN221748421U (en) | Mining intelligent gateway |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |