Fire extinguishing system and device with low power consumption of bus

Abstract

The utility model relates to a fire extinguishing system and device with low power consumption of a bus, which utilize the unilateral conductivity of a diode, the diode is not conducted without forward voltage difference during standby, and current can pass through normally after voltage difference conduction is generated during short circuit of the bus, so as to control the closing and opening of an isolation relay and carry out isolation protection on an extension module circuit. Circuit devices are few and can be easily added to an extension module circuit, additional isolation modules are not needed, each module can independently achieve isolation protection, on-site construction is more convenient, and the total cost is lower. Aiming at the characteristics of large action current and small holding current of the relay, the capacitor is used for storing energy to maintain standby high voltage so as to instantly provide large current for the relay to maintain the switch of the relay in an off state, the large resistor is used for providing small current to maintain the switch to be off, and the large resistor can also prevent the energy storage capacitor from attenuating alternating current signals on a bus. The power supply current at the moment of relay action is large, the power consumption current during maintenance is small, and the influence on bus alternating current signals is small.

Description

Technical Field

[0001] This utility model relates to the field of fire protection systems, and in particular to a low-power fire protection system and device with a bus. Background Technology

[0002] Currently, the isolation modules or circuits used on various bus systems in fire protection products are quite complex, with many components, and their standby power consumption (when no short circuit occurs) is considerable. The terminal components connected to the bus system often have limited structural space. Combining isolation circuits with other detection circuits into a single terminal component module makes it difficult to accommodate numerous components, resulting in high costs. Furthermore, when a large number of terminal components need to be connected to the bus system, the total current consumption is too high, and the high line loss due to cable resistance limits the number of components that can be connected.

[0003] Chinese Patent Publication No. CN209200648U relates to a two-wire fire bus isolation protection circuit, comprising: a first switching module with its control electrode connected to the positive output terminal of a rectifier module and its output electrode grounded; a relay with its coil input terminal connected to the positive output terminal of the rectifier module, its coil output terminal connected to the input electrode of the first switching module, and its normally closed stationary contact connected to the positive output terminal of the rectifier module; a second switching module with its input electrode connected to the control electrode of the first switching module and its output electrode grounded; an output interface with its positive output terminal connected to the control electrode of the second switching module and its negative output terminal grounded; a third switching module with its input electrode connected to the positive output terminal of the rectifier module and its output electrode connected to the control electrode of the second switching module; and a relay moving contact connected to the positive output terminal of the output interface. This invention solves the problems of long-distance communication being affected by self-resetting fuses in two-wire isolation modules, errors due to temperature influence, and long recovery times. The isolation circuit described in this patent is relatively complex, has many components, and consumes a relatively high amount of power in standby mode.

[0004] Chinese Patent Publication No. CN221995111U discloses a non-polar fire protection bus isolation module circuit, which includes rectifier bridges D1 and D2, relay K1, fuse F1, optocoupler U1, NPN transistor Q1, bus input terminals B1_IN and B2_IN, bus output terminals B1_OUT and B2_OUT. Under normal operating conditions, rectifier bridges D1 and D2 are not working. When bus output terminals B1_OUT and B2_OUT are short-circuited, fuse F1 opens, the coil of relay K1 is energized, fuse F1 is disconnected from relay K1, and the bus circuit is completely disconnected. When the short circuit is cleared, rectifier bridge D1 is energized, the switch terminal of optocoupler U1 is turned on, pulling up the base voltage of NPN transistor Q1. NPN transistor Q1 turns on, causing relay K1 to short-circuit the coil, relay K1 is de-energized and reset, rectifier bridges D1 and D2 are de-energized, and the bus circuit is reconnected. This invention effectively implements short-circuit protection without requiring polarity differentiation, thus better meeting application requirements. However, the isolation module circuit of this patent requires more electronic components, resulting in higher costs; furthermore, when a large number of terminal components need to be connected to the bus, the total current consumption is too high, limiting the number of components that can be connected.

[0005] To address the above issues, this utility model patent proposes a simple bus isolation circuit design with extremely low standby power consumption, low power consumption during short circuits, and a simple circuit with fewer components. Utility Model Content

[0006] The technical problem this invention aims to solve is that the isolation modules or circuits on the existing fire protection product bus are complex, have many components, and consume a lot of power in standby mode. To address these shortcomings of the prior art, this invention provides a low-power fire protection system and device with a dedicated bus.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A low-power fire protection system based on a bus is constructed, comprising a fire control panel and at least one set of fire protection sub-units connected to the fire control panel. The fire protection sub-units are connected to the fire control panel via a fire bus and are powered by the fire control panel. Each fire protection sub-unit is equipped with an isolation circuit, which includes a relay connected to the fire bus and a relay control circuit connected to both ends of the relay. The relay control circuit is not activated when the corresponding fire protection sub-unit is in standby mode, but is activated when the fire bus is short-circuited, causing the relay connected to it to disconnect, thereby isolating and protecting the corresponding fire protection sub-unit.

[0009] Preferably, it also includes a relay power supply circuit connected to the relay and the relay control circuit, the relay power supply circuit providing operating and sustaining current to the relay, the operation including the relay moving from closed to open or from open to closed.

[0010] Preferably, the relay power supply circuit further includes an energy storage module, which is connected to the relay coil and is charged when the fire alarm unit is in standby mode. In the event of a short circuit, the energy storage module discharges to supply power to the relay, causing the relay switch to open.

[0011] Preferably, the relay power supply circuit further includes an isolation module, which is connected to the energy storage module and is placed between the fire bus and the energy storage module. When the relay is disconnected, the isolation module provides a sustaining current to the relay.

[0012] Preferably, the relay control circuit includes an eighth diode and a tenth diode. The positive terminals of the eighth and tenth diodes are connected together and connected to the first terminal of the relay coil. The negative terminal of the eighth diode is connected to the first terminal of the relay switch, and the negative terminal of the tenth diode is connected to the second terminal of the relay switch. When the relay switch is placed at the first and second terminals, the relay is closed. When the fire-fighting sub-unit is in standby mode, neither the eighth nor the tenth diode is conducting. When the fire bus is short-circuited, the eighth or tenth diode in the fire-fighting sub-units on both sides of the short-circuit point conducts, causing the corresponding relay to disconnect.

[0013] Preferably, the relay power supply circuit includes a seventh diode and a ninth diode. The negative terminals of the seventh diode and the tenth diode are connected together and connected to the second terminal of the relay coil. The positive terminal of the seventh diode is connected to the second terminal of the relay switch and to the negative terminal of the tenth diode. The positive terminal of the ninth diode is connected to the first terminal of the relay switch and to the negative terminal of the eighth diode. After the relay is disconnected, the corresponding seventh diode or ninth diode normally provides current to maintain the relay coil disconnection.

[0014] Preferably, the relay power supply circuit further includes a 37th resistor connected to the negative terminals of the 7th and 9th diodes. The other end of the 37th resistor is connected to the positive terminal of the 14th capacitor and to the second terminal of the relay coil. When the fire unit is in standby mode, the 7th and 9th diodes charge the 14th capacitor through the 37th resistor. In the event of a short circuit, the 14th capacitor discharges to power the relay and disconnect the relay. The 37th resistor provides a sustaining current for the disconnection of the relay.

[0015] Both the eighth and tenth diodes are connected to an indicator module, which determines whether a short circuit has occurred at the first or second terminal of the relay.

[0016] Preferably, the isolation circuit further includes a detection circuit connected to the relay control circuit, and a feedback circuit connected to the detection circuit. The feedback circuit is connected to the fire alarm control panel and notifies the fire alarm control panel of the detection status of the detection circuit through the feedback circuit.

[0017] A fire-fighting device is constructed, characterized in that it includes a low-power fire-fighting system based on the bus described above.

[0018] The beneficial effects of this invention are as follows: Utilizing the unidirectional conductivity of a diode, and its characteristic of not conducting without a forward voltage difference in standby mode, but conducting when a voltage difference is generated during a bus short circuit, it can normally carry current, thereby controlling the opening and closing of the isolation relay to achieve isolation protection for the sub-module circuit. Furthermore, this method requires fewer circuit components, making it easy to add to the sub-module circuit without the need for additional isolation modules. Each module can independently achieve isolation protection, making on-site construction more convenient and reducing overall cost. Simultaneously, addressing the characteristics of relays having large operating current and small holding current, a capacitor is used to store energy to maintain a high standby voltage, thereby providing a large current to the relay to open the switch. Then, a relatively large resistor is used to provide a small current to maintain the switch open, and this large resistor is used to block the attenuation of AC or pulse signals on the bus by the energy storage capacitor. This application achieves a large instantaneous supply current for the relay during operation and a small current consumption during holding, with minimal impact on bus AC or pulse signals, resulting in a simple, extremely low standby power consumption and extremely low power consumption during short circuits, with a simple circuit and fewer components. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a simplified schematic diagram of a fire telephone system according to a preferred embodiment of the present invention;

[0021] Figure 2 This is a wiring diagram of the extension module and adjacent extension modules in a preferred embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the isolation circuit of the extension module in a preferred embodiment of the present invention;

[0023] Figure 4 The following is a detailed circuit diagram of the isolation circuit of the extension module in a preferred embodiment of this utility model. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] A preferred embodiment of this utility model provides a low-power fire protection system for bus systems; such as... Figures 1-2 As shown, it includes a fire control panel and multiple fire sub-units connected in series. The fire control panel and the fire sub-units are connected through a fire bus, and each fire sub-unit is connected in series on the fire bus to form a fire protection system. The electrical signal is input into the fire protection system through the fire control panel, and then transmitted to the fire sub-units through the fire bus to power the fire sub-units and enable them to work. Finally, the signal returns to the fire control panel to form the electrical signal transmission of the fire protection system, and powers the fire control panel and the fire sub-units to make them work.

[0026] Specifically, such as Figure 3 As shown, each fire-fighting sub-unit is equipped with an isolation circuit. Since the internal circuit structure of each sub-unit is identical, power is supplied to the sub-unit via the isolation circuit connected to the fire bus. The isolation circuit includes a relay 40 connected to the bus, a relay control circuit 30 connected to the relay, and a relay power supply circuit 50. The relay 40 is also connected to a detection circuit 20, which is connected to an MCU circuit 70 to transmit the relay's detection information to the MCU circuit. The MCU circuit 70 is connected to a feedback circuit 10, which is connected to the fire control panel to transmit the detection signal to the fire control panel. The isolation circuit also includes an MCU power supply circuit 60 connected to the relay power supply circuit 50, and an MCU circuit 70 connected to the MCU power supply circuit. The MCU circuit is connected to the relay control circuit 60. The relay power supply circuit 50 provides the relay with the current for operation and maintenance. When a short circuit occurs between the positive and negative wires of the cable connected to the sub-unit module, the relay control circuit 30 conducts, and the relay 40 switches off, achieving isolation and protection functions, thereby protecting the normal operation of the terminal components.

[0027] Furthermore, such as Figure 2 and Figure 4As shown, relay K1 has 5 sets of contacts, of which contacts 1, 4, and 6 are switch contacts, and contacts 2 and 5 are coil contacts. Contact 4 is connected to the positive terminal of the bus and is connected to the system bus through contact 1. The relay is turned on when contact 1 is open. Relay control circuit 30 includes a seventh diode D7 connected to contact 1 of relay K1, with the positive terminal of diode D7 connected to contact 1 of relay K1. Relay power supply circuit 50 also includes a ninth diode D9 connected to the negative terminal of diode D7, with the negative terminal of diode D9 connected to the negative terminal of diode D7. It also includes a thirty-seventh resistor R37 connected to the negative terminal of diode D7. The other end of resistor R37 is connected to a fourteenth capacitor C14, the other end of which is grounded and connected to the negative terminal of the bus. The connection between resistor R37 and capacitor C14 is connected to contact 5 of relay K1. The relay control circuit 30 includes an eighth diode D8 and a tenth diode D10. The positive terminals of both the eighth diode D8 and the tenth diode D10 are connected to the second contact of the relay K1. The negative terminal of the eighth diode D8 is also connected to the fourth contact of the relay K1 and to the positive terminal of the bus. The negative terminal of the eighth diode D8 is connected to the positive terminal of the ninth diode D9. The negative terminal of the tenth diode D10 is connected to the positive terminal of the seventh diode D7 and to the bus of the fire protection system.

[0028] Furthermore, such as Figure 2 and Figure 4 As shown, the relay power supply circuit 50 provides the current for the relay's operation and maintenance. The seventh diode D7 and the ninth diode D9 draw power from the left and right ends of the relay, respectively, from the fourth and first contacts of relay K1. When a short circuit occurs on the bus, relay K1 disconnects, and the un-short-circuited end can still provide current normally. For example, if a short circuit occurs at bus A, the relay can provide current through bus B. The fourteenth capacitor C14 is selected as an energy storage capacitor, and the thirty-seventh resistor R37 is the power supply path resistor. The thirty-seventh resistor R37 isolates the AC signal of the bus from the fourteenth capacitor C14, preventing the fourteenth capacitor C14 from attenuating the AC component of the bus. Alternatively, the thirty-seventh resistor can be replaced with other blocking circuits, which can be equivalently used as resistors to block the AC signal of the bus from the fourteenth capacitor C14. When the extension unit is in standby mode, the seventh diode D7 and the ninth diode D9 charge the fourteenth capacitor C14 through the blocking circuit. When the extension module is short-circuited, the electricity stored in the fourteenth capacitor C14 supplies power to the relay K1, causing the relay K1 to disconnect. Then, the thirty-seventh resistor R37 provides the sustaining current.

[0029] Furthermore, such as Figure 2 and Figure 4As shown, the following explanation will take a short circuit between the positive and negative terminals of the cable between extension module 1 and extension module 2 as an example. When there is no short circuit between extension module 1 and extension module 2, extension module 1 and extension module 2 will operate normally. At this time, the negative terminals of the eighth diode D8 and the tenth diode D10 of extension module 1 and extension module 2 are both at high voltage, which is the same as the positive terminal of the fourteenth capacitor C14. At this time, neither the eighth diode D8 nor the tenth diode D10 conducts, and no current flows through the coil of relay K1, so the relay is in a normally closed state. When a short circuit occurs on the right side of extension module 1, the voltage at the negative terminal of the tenth diode D10 of extension module 1 becomes low. Since the positive terminal of the tenth diode D10 is still at high voltage, the tenth diode D10 will conduct. Current flows from the fourteenth capacitor C14 through the coil of relay K1 and the tenth diode D10 to the negative terminal of the cable, and the switch of relay K1 is opened. At this time, the left side of sub-module 1 maintains a high voltage. The current at the positive terminal of the left side flows through the ninth diode D9, through the thirty-seventh resistor R37, then through the coil of relay K1, and then through the tenth diode D10 to the negative terminal of the cable, thus keeping the relay K1 coil open. Similarly, at this time, the voltage at the negative terminal of the eighth diode D8 of sub-module 2 decreases, and the eighth diode D8 conducts. The current flows from the fourteenth capacitor C14 through the coil of relay K1 and, together with the eighth diode D8, to the negative terminal of the cable, thus opening the switch of relay K1. At this time, the right side of sub-module 2 continues to maintain a high voltage. The current at its positive terminal flows through the ninth diode D9, through the thirty-seventh resistor R37, then through the coil of relay K1, and then through the tenth diode D10 to the negative terminal of the cable, thus keeping the relay coil open. After the short circuit is released, neither the eighth diode D8 nor the tenth diode D10 conducts. At this time, no current flows through the relay coil, the relay switch is in the closed state, and the corresponding fire-fighting sub-module automatically returns to normal operation. During short-circuit isolation, in addition to the relay of the corresponding fire-fighting unit disconnecting for isolation protection, the other functions of the fire-fighting unit can still work normally, and all functions of other fire-fighting units that are not isolated can also work normally. After the short circuit is released, the fire-fighting unit automatically returns to normal, and all functions can work normally to ensure the normal operation of the fire protection system.

[0030] Furthermore, such as Figure 2 and Figure 4As shown, the detection circuit 20 in the isolation circuit can also be connected to form a terminal component. For example, it can be connected to the second contact of relay K1 through the 38th resistor R38. A short circuit is detected through the 38th resistor R38. After the MCU circuit detects the short circuit, it can notify the fire control panel through the feedback circuit 10. The resistance value of the 38th resistor R38 can also be increased. If short circuit detection is not required, the detection circuit can be omitted, and it will not consume power in standby mode. To more easily determine whether a short circuit in the sub-unit module occurs on the left or right side, LEDs can be connected in series with the 8th diode D8 and the 10th diode D10 to provide an indication function. The illumination of the LEDs indicates whether a short circuit fault has occurred on the left or right side of the sub-unit module, making the determination more direct and clear. It should be noted that when a short circuit occurs between extension modules, the relays K1 of multiple series-connected modules may temporarily disconnect. After disconnection, because it is not a true short circuit location, the eighth diode D8 and tenth diode D10 of the extension modules to the left and right of that location will not have current. However, the relays will quickly close again, ensuring the normal operation of modules with normal cables and terminal components. Extension modules to the left and right of the true short circuit point, due to the actual conduction of the eighth diode D8 or tenth diode D10, will remain disconnected. By disconnecting the relay K1 when a short circuit occurs, the normal operation of the terminal components is protected. When there is no current flowing through the coil of relay K1, the switch is closed. When the current flowing through the coil of relay K1 reaches the operating current, the switch will open. After the relay switch opens, if the current flowing through the coil still exceeds the release current, the switch will remain open, and the current demand will be relatively small.

[0031] Furthermore, such as Figure 4 As shown, MCU circuit 70 uses the fourth chip U4, model STM32G030F6P6. Its pin 6 is connected to relay power supply circuit 50 through a series connection of the first capacitor C1 and the third resistor R3. MCU power supply circuit 60 uses the fifth chip U5, model HT7133-1, with a withstand voltage requirement of 30V. Its pins 1 and 2 are connected in parallel through a parallel connection of the twelfth capacitor C12 and the thirteenth capacitor C13. Pins 1 and 3 are connected through an eleventh capacitor C11 and a fourteenth capacitor C14. The relay power supply circuit is connected to the MCU power supply circuit through the fifth diode D5 and the thirty-seventh resistor R37.

[0032] A preferred embodiment of this utility model provides a fire protection product device based on the aforementioned low-power bus fire protection system. The fire protection product device includes the low-power bus fire protection system, and the specific low-power bus fire protection system is the same as described above, so it will not be repeated here.

[0033] It should be understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A low-power fire protection system via a bus, comprising a fire control panel and at least one set of fire protection sub-units connected to the fire control panel, wherein the fire protection sub-units are connected to the fire control panel via a fire bus and the fire control panel is powered by the fire bus, characterized in that: The fire-fighting extension set is provided with an isolation circuit, which comprises a relay connected with a fire-fighting bus and a relay control circuit connected with both ends of the relay, the relay control circuit is not conductive when the corresponding fire-fighting extension set is on standby, and is conductive when the fire-fighting bus is short-circuited, so as to disconnect the relay connected therewith, thereby isolating and protecting the corresponding fire-fighting extension set.

2. The fire protection system of claim 1, wherein: The relay control circuit is connected with a relay power supply circuit, which provides the relay with an operating current and a maintaining current, and the operation includes switching the relay from closed to disconnected or from disconnected to closed.

3. The fire protection system of claim 2, wherein: The relay power supply circuit further comprises an energy storage module, which is connected with the relay coil and is charged when the fire-fighting extension set is on standby, and is discharged to disconnect the relay when short-circuited.

4. The fire suppression system of claim 3, wherein: The relay power supply circuit further comprises a blocking module, which is connected with the energy storage module and is arranged between the fire-fighting bus and the energy storage module, and provides the relay with a maintaining current when the relay is disconnected.

5. The fire suppression system of claim 2, wherein: The relay control circuit comprises an eighth diode and a twelfth diode, the anode ends of the eighth diode and the twelfth diode are connected with each other and connected with the first end of the relay coil, the cathode end of the eighth diode is connected with the first end of the relay switch, and the cathode end of the twelfth diode is connected with the second end of the relay switch, the relay is closed when the first end and the second end are arranged, the eighth diode and the twelfth diode are not conductive when the fire-fighting extension set is on standby, and the eighth diode or the twelfth diode in the fire-fighting extension set on the two sides of the short-circuit point is conductive to disconnect the corresponding relay switch when the fire-fighting bus is short-circuited.

6. The fire protection system of claim 5, wherein: The relay power supply circuit comprises a seventh diode and a ninth diode, the cathode ends of the seventh diode and the twelfth diode are connected with each other and connected with the second end of the relay coil, the anode end of the seventh diode is connected with the second end of the relay switch and the cathode end of the twelfth diode, and the anode end of the ninth diode is connected with the first end of the relay switch and the cathode end of the eighth diode, the seventh diode or the ninth diode normally provides a current to maintain the disconnection of the relay coil after the relay is disconnected.

7. The fire protection system of claim 6, wherein: The relay power supply circuit further comprises a thirty-seventh resistor connected with the cathode ends of the seventh diode and the ninth diode, the other end of the thirty-seventh resistor is connected with the anode end of a fourteenth capacitor and the second end of the relay coil, the seventh diode and the ninth diode charge the fourteenth capacitor through the thirty-seventh resistor when the fire-fighting extension set is on standby, the fourteenth capacitor is discharged to disconnect the relay when short-circuited, and the thirty-seventh resistor provides a maintaining current for the disconnection of the relay; The eighth diode and the twelfth diode are both connected with an indication module, which is used to determine whether the first end or the second end of the relay is short-circuited.

8. The fire suppression system of claim 1, wherein: The isolation circuit further comprises a detection circuit connected with the relay control circuit, and a return code circuit connected with the detection circuit, wherein the return code circuit is connected with the fire-fighting host, and the detection state of the detection circuit is informed to the fire-fighting host through the return code circuit.

9. A fire fighting device characterised by: A bus low-power fire-fighting system comprising a bus low-power fire-fighting system according to any one of claims 1-8.

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