Explosion-proof audible and visual alarm

Abstract

The invention discloses an explosion-proof audible and visual alarm which comprises a bus power supply module and an audible and visual alarm module, the bus power supply module provides a fire-fighting two-bus L + and 24V + power supply, the audible and visual alarm module is powered by DC voltage, and the first bus power supply module interface is used for connecting an enhanced power supply interface and a single power supply interface of the bus power supply module; the first main controller module U2 receives and feeds back communication signals of other modules and is connected with the fire-fighting two-bus power supply L + to supply power, the first 24V communication isolation module comprises a first power supply system clutch module, and the first power supply system clutch module comprises a magnetic latching relay k1, a control power supply 24V + and a fire-fighting two-bus are one power supply system or two independent power supply systems; the 24DVC voltage output end of the first power system clutch module is connected with the 24DVC voltage output end of the first power system clutch module, receives communication signals of the first 24V communication isolation module or the first main controller module U, and outputs the communication signals to a buzzer driving circuit to give out warning light and alarm sound. According to the explosion-proof audible and visual alarm, the working mode is self-adaptive switching between an acousto-optic two-wire mode and an acousto-optic four-wire mode.

Description

Technical Field

[0001] The invention relates to the field of fire protection, in particular to sound and light alarm equipment, in particular to explosion-proof sound and light alarm equipment. Background Art

[0002] Explosion-proof sound and light alarms are commonly used in the fire protection industry. In the fire protection industry, the common types of sound and light are: two-wire (fire two-bus or 24V+) explosion-proof sound and light; four-wire (fire two-bus and 24V+) explosion-proof sound and light. For four-wire explosion-proof sound and light, the common practice in the industry is that 24V+ power supply is used for power supply, and the fire two-bus is used for communication. Only 24V+ or only the loop is provided, and the explosion-proof sound and light cannot work normally. This greatly limits the application scenarios of explosion-proof sound and light, such as: when there are only two-wire power supply on site, the four-wire sound and light cannot be used. For another example, when the intensity of sound and light needs to be increased on site, the two-wire sound and light cannot meet the use requirements. Based on this, this patent proposes an explosion-proof sound and light that can meet both two-wire and four-wire work.

[0003] The reason why explosion-proof sound and light have a need for four-wire operation is that the power of the fire protection bus is limited and cannot provide enough power for the sound and light, which limits the number of sound and light carried on the bus, and the sound intensity and light intensity of the sound and light are also limited. The use of a four-wire system can realize that the fire protection bus is used for communication, and the 24V+ power supply is used for the sound and light power supply, taking into account communication, sound intensity and light intensity. However, one disadvantage of the four-wire system is that the number of on-site cables is doubled compared to the two-wire system, which increases the cost and difficulty of on-site wiring. In some occasions where the number of sound and light is not required, and the sound intensity and light intensity are not high, the demand for two-wire sound and light is also urgent. The sound and light available on the market are either two-wire or four-wire, and there are very few sound and light alarm products that are compatible with the four-wire and two-wire systems.

[0004] When the explosion-proof sound and light uses a four-wire working mode, two wires are used for fire circuit communication, and the other two wires are used to power the sound and light alarm. In this working mode, in order to ensure the stable operation of the sound and light communication, the power supply and ground of the two sets of power lines must be physically isolated, otherwise there will be a communication failure in the fire second bus circuit. The four-wire power supply explosion-proof sound and light can be divided into two types according to the scheduled working mode: addressable type and non-addressable type. The main difference between the addressable type and the non-addressable type is that the addressable type needs to start the sound and light through communication, while the non-addressable type starts the sound and light as long as the power is supplied. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an explosion-proof sound and light alarm, which meets both two-wire and four-wire working modes, and the two-wire and four-wire working modes are automatically switched, there is no limit on the number of sound and light carried on the bus, and the sound intensity and light intensity of the sound and light are not constrained, especially the sound and light communication can operate stably after isolation.

[0006] In order to solve the above technical problems, an explosion-proof sound and light alarm includes a first bus power module and a sound and light alarm module, characterized in that it also includes: The first bus power module interface: including an enhanced power interface and a single power interface; First bus power module: connects the enhanced power interface and the single power interface, and provides fire protection second bus L+ power and\or 24V+ power; The first DC power supply detection module: used to detect whether the front end of the optical coupler N1 is connected to the 24VDC of the first bus power supply module, and the back end triggers high or low different level signals; The first main controller module U2: obtains the connection identification of the 24VDC power supply of the high or low level signal of the first DC power supply detection module, and determines whether the signal is isolated, specifically including: If it is determined that a 24VDC power supply is connected, the first main controller module U2 sends a power separation signal R_Rly to the first 24V communication isolation module U39 in an isolated state to generate an isolated power separation signal R_Rlydri and send it to the first power system clutch module. At the same time, the first main controller module U2 receives the sound and light start instruction of the controller, and sends the sound and light drive signal to the first 24V communication isolation module U39~U41 in the isolated state for signal isolation and then sends it to the sound and light alarm module; otherwise: If it is determined that there is no 24VDC power supply connected, the first main controller module U2 sends a power merging signal Set_Rly to the first power system clutch module, and the first main controller module U2 receives the sound and light start command of the controller, and sends the sound and light drive signal to the first 24V communication isolation module U39~U41 in a non-isolated state without signal isolation and sends it to the sound and light alarm module; The first power system clutch module: if the front end obtains the isolated power separation signal R_Rlydri, the L+ power system and the 24V+ power system circuit are disconnected to form two independent power systems; if the back end obtains the power merging signal Set_Rly, the fire protection bus L+ power system and the 24V+ power system circuit are closed to form one power system; Sound and light alarm module: powered by the 24VDC direct current of the clutch module of the first power supply system, receives the sound and light driving signal of the first 24V communication isolation module to drive the buzzer circuit to emit warning light and alarm sound.

[0007] The explosion-proof sound and light alarm according to claim 1 is characterized in that the front end of the first DC power supply detection module, the front end of the first 24V communication isolation module, the front end of the first power system clutch module and the 24V+ power ground of the first bus power module are all AGND; The grounding of the first main controller module U2, the rear end of the first DC power supply detection module, the rear end of the first 24V isolation power supply module, the rear end of the first power supply system clutch module and the first bus power supply module L+ power supply are all GND.

[0008] The optocoupler N1 of the first DC power supply detection module includes: a diode at the front end and a phototransistor at the rear end, the first pin of the diode is connected to the voltage divider resistor R256 and one end of the resistor R262, the other end of the resistor R256 is connected to 24VDC, the other end and the second pin of the resistor R262 are grounded, the fourth pin of the phototransistor is connected to the DC power supply, the third pin of the phototransistor is connected to the resistor R255 and the ground, and the third pin of the phototransistor is connected to the first main controller module U2.

[0009] The first 24V communication isolation module includes multiple isolation chips, including at least isolation chips U39~U41, wherein the isolation chip U39 obtains the power separation signal R_Rly, and the isolation chips U40~U41 are used to obtain the acoustic-optical driving signals.

[0010] The two power supply systems of the clutch module of the first power supply system are specifically: the front end of the magnetic latching relay k1: including a front end coil, a front end control circuit, a fifth contact and an eighth contact connected to each other, the eighth contact is connected to a 24V+ power supply output terminal, and the fifth contact and the front end of the relay are grounded; the front end control circuit obtains the isolated power separation signal R_Rlydri, and controls the fourth and fifth contacts and the eighth and ninth contacts to be in a disconnected state; A power supply system of the clutch module of the first power supply system is specifically as follows: the rear end of the magnetic holding relay k1: having a rear end coil, a rear end control circuit, a fourth contact and a ninth contact connected to each other, the ninth contact is connected to the fire bus 2 L+ power supply output terminal, the fourth contact and the rear end control circuit are grounded; the 24V+ power supply terminal is connected in series with a diode D14 to output 24VDC, the fire bus 2 L+ is connected in series with a diode D15 to output power V+, the rear end control circuit obtains a power merging signal Set_Rly, and controls the fourth and fifth contacts and the eighth and ninth contacts to be in a closed state.

[0011] The front-end control circuit of the power system clutch module includes: one end of the front-end coil is connected to 24VDC, the other end is connected to the third pin of the transistor Q9, the first pin of the transistor Q9 is connected to one end of the resistor R56, the other end of the resistor R56 is the isolated power separation signal R_Rlydri, and the second pin of the transistor Q9 is connected to R261 and the ground AGND.

[0012] The explosion-proof sound and light alarm according to claim 6 is characterized in that the back-end control circuit of the power system clutch module includes: one end of the back-end coil is connected to the power supply V+, and the other end is connected to the third pin of the transistor Q10, the first pin of the transistor Q10 is connected to one end of the resistor R258, the other end of the resistor R258 is the power merging signal Set_Rly end, and the second pin of the transistor Q10 is connected to R260 and the ground GND.

[0013] The present invention discloses another technical solution: an explosion-proof sound and light alarm, comprising a second bus power supply module and a sound and light alarm module, and further comprising: The second bus power module interface: including an enhanced power interface and a single power interface; Second bus power supply module: used to connect the enhanced power supply interface and the single power supply interface, and provide the fire protection second bus L+ power supply and\or the second 24V isolated power supply; The second 24V isolated power supply: includes a signal isolation circuit composed of a transformer T1 and an optical coupler N1, whose front-stage voltage terminal is connected to the 24V+ of the second bus power module, and the output voltage of the rear-stage power input terminal VCC_24V of the isolation circuit is 28V; The second power system clutch module: includes a diode D1 anode connected to the power input terminal VCC_24V of the second 24V isolated power module, a diode D2 anode is connected to the fire second bus L+ power supply, a diode D2 cathode and a diode D1 cathode are combined to provide 24V power supply for the power supply V+, and a high or low level signal of VCC_24V triggers the diode D1 to turn on or off to realize a single power supply or dual power supply system; The second DC power supply detection module: the front end of the module has or does not have a second 24V isolated power supply connected to the power input terminal VCC_24V, and the back end of the module triggers a high or low level signal accordingly; The second main controller module U2: obtains the high or low level signal of the second DC power supply detection module to determine the connection of the 24V+ power supply; if it is determined that the 24V+ power supply is connected, the second DC power supply detection module U2 receives the sound and light start command of the controller, and sends the sound and light drive signal to the sound and light alarm module; if it is determined that the 24V+ power supply is not connected, the second main controller module U2 sends a 24V fault message to the controller or sends the sound and light drive signal to the sound and light alarm module only when the SW1 pin is closed; Sound and light alarm module: It is powered by 24V V+ of the second power system clutch module, and receives the sound and light driving signal of the second main controller module U2 to control the buzzer to emit warning light and alarm sound.

[0014] The second DC power supply detection module includes: one end of a resistor R6 is connected to a power input terminal VCC_24V, the other end of the resistor R6 is connected in series with a resistor R7, and the resistor R7 is also connected in parallel with a capacitor C8 with a capacitance of 10uF and then grounded; The second bus power module, the second power system clutch module, the second main controller module U2 and the second 24V isolated power supply are grounded at the rear stage to GND, and the second 24V isolated power supply is grounded at the front stage to AGND.

[0015] The technical effect of the present invention is that when the explosion-proof sound and light alarm of the present invention works with two lines (whether it is the fire protection bus 2 or 24V+), the combined power supply can be used to control the power supply of the main controller module MCU (U2) and to supply the sound and light 24V of the sound and light alarm module. Since there is only one power supply system, there is no problem of loop communication failure caused by the two power supply systems sharing a common ground or a common positive pole.

[0016] When the explosion-proof sound and light alarm of the present invention uses a four-wire working mode, two wires are used for fire circuit communication, and the other two wires are used for sound and light power supply. In this working mode, in order to ensure the stable operation of sound and light communication, when the four-wire working mode is adopted in scheme 1, the communication of the two power supply systems (the corresponding grounds are GND and AGND respectively) is achieved through the optical coupler N1 and the isolation chip U39~U41 to achieve isolated communication. In addition, through the magnetic latching relay k1 of the clutch module of the first power supply system, the power supply and grounding of the two groups of power lines are physically isolated.

[0017] In the second embodiment, the present invention adopts the signal isolation of the second 24V isolated power supply to solve the influence of the distributed capacitance on the loop waveform and loop communication when the 24V+ power supply and the fire protection bus L+ loop are powered at the same time. In the four-wire working mode, the second 24V isolated power supply provides 24V power supply as the main power supply, and the loop fire protection bus L+ power supply as an auxiliary power supply can reduce the power consumption of the loop power supply and further increase the number of sound and light carried by the loop.

[0018] The two technical solutions in the implementation of the present invention belong to one inventive concept in that: both embodiments one and two can meet the two-wire and four-wire working modes by isolating the communication and merging or separating the two power supplies, and the working scenes of the two-wire and four-wire working modes can be adaptively switched automatically, and the number of sound and light carried on the bus, the sound intensity and light intensity of the sound and light are not restricted by the environment, especially the sound and light communication can run stably after isolation to avoid signal interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a module diagram of the first embodiment of the explosion-proof sound and light alarm of the present invention; Figure 2 The circuit diagram of the first embodiment of the explosion-proof sound and light alarm of the present invention; Figure 3 It is a module diagram of the second embodiment of the explosion-proof sound and light alarm of the present invention; Figure 4-Figure 5The circuit diagram of the second embodiment of the explosion-proof sound and light alarm of the present invention; Figure 6 The present invention is a schematic diagram of a buzzer driving circuit of an explosion-proof sound and light alarm. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Embodiment 1 like Figure 1 , Figure 2 and Figure 6 As shown, an explosion-proof sound and light alarm of the present invention comprises a first bus power supply module and a sound and light alarm module.

[0024] The first bus power module interface includes an enhanced power interface and a single power interface; the first bus power module: connects the enhanced power interface and the single power interface to provide the fire second bus L+ and\or 24V+ power. Figure 2 As shown, when the fire bus 2 is connected to the power supply terminal JP4, there are four interfaces in total, including the L+ power interface: single power interface 3 and single power interface 4, and the 24V+ power interface: enhanced power interface 1 and enhanced power interface 2.

[0025] The first DC power supply detection module is used to detect whether the front end of the optocoupler N1 obtains 24VDC connected to or not connected to the first bus power supply module, and the back end triggers high or low different level signals. The specific circuit structure of the optocoupler N1 includes: a diode at the front end and a phototransistor at the back end, the first pin of the diode is connected to the voltage divider resistor R256 and one end of the resistor R262, the other end of the resistor R256 is connected to 24VDC, the other end of the resistor R262 and the second pin are grounded AGND, the fourth pin of the phototransistor is connected to a DC power supply, the third pin of the phototransistor is connected to the resistor R255, and the third pin of the phototransistor is connected to the first main controller module U2.

[0026] Figure 1-Figure 2 As shown, the first main controller module U2 obtains the high or low level signal of the first DC power supply detection module 24VDC power supply connection to determine whether the signal is isolated.

[0027] The first 24V communication isolation module: if it includes multiple isolation chips, in this embodiment, it includes isolation chips U39~U41. The front end of the magnetic latching relay k1 of the first power system clutch module: includes a front end coil, a front end control circuit, a fifth contact and an eighth contact connected to each other, the eighth contact is connected to the 24V+ power output terminal, and the fifth contact and the front end of the relay are grounded; The rear end of the magnetic holding relay k1: has a rear end coil, a rear end control circuit, a fourth contact and a ninth contact that are interconnected, the ninth contact is connected to the fire bus 2 L+ power supply output terminal, the fourth contact and the rear end control circuit are grounded; the 24V+ power supply terminal is connected in series with the diode D14 to output 24VDC, the fire bus 2 L+ is connected in series with the diode D15 to output the power supply V+, the rear end control circuit obtains the power merging signal Set_Rly, and controls the fourth and fifth contacts and the eighth and ninth contacts to be in a closed state.

[0028] The following describes the four-wire and two-wire working modes separately: 1) When in four-wire working mode, the fire bus 2 is connected to the interface 3 and 4 of JP4, and the 24V+ power supply is connected to the interface 1 and 2 of JP4. The first main controller module U2 can be powered by the fire bus 2, the sound and light alarm module must be powered by 24V DC, and the communication signal must be isolated.

[0029] For the isolated communication part: when the optocoupler N1 detects that the front end is connected to a 24VDC power supply: the first main controller module U2 and the optocoupler N1 can identify the 24VDC power supply connection of the enhanced power supply interface 1 and the enhanced power supply interface 2 of JP4 through the 24_Dect pin. When there is power on the 24V side, the 24_Dect pin outputs a high level, and the first main controller module U2 sends a power separation signal R_Rly to the isolated isolation chip U39 to generate an isolated power separation signal R_Rlydri and send it to the first power system clutch module. At the same time, the first main controller module U2 receives the sound and light start instruction of the controller, sends the sound and light drive signal (CAP_C, BeeP, Light, 62S_EN) to the isolated isolation chip U39~U41 for signal isolation, and then sends the isolated sound and light drive signal (CAP_Ctr, BeeP_Ctr, LightCtr, 62S_EN_Ctr) to the sound and light alarm module.

[0030] The first power supply system clutch module: the front-end control circuit obtains the isolated power separation signal R_Rlydri to trigger the L+ power supply system and the 24V+ power supply circuit to disconnect into two independent power supply systems. The process is as follows: the magnetic holding relay k1 controls the fourth contact 4 and the fifth contact 5 of its negative pole and the eighth contact 8 and the ninth contact 9 of its positive pole to be physically disconnected and isolated. The L+ power supply and the 24V+ power supply are two independent power supplies. The 24V+ power supply supplies the sound and light alarm module. They do not affect each other, ensuring the stability of the communication data of the fire protection circuit second bus.

[0031] Therefore, in the four-wire working mode, the communication between the two power supply systems (the corresponding grounds are GND and AGND respectively) is isolated through the optocoupler N1 and the isolation chip U39~U41.

[0032] 2) When two-wire operation is in progress (whether it is a loop or a second fire protection bus), the L+ power interface is connected to the single power interface 3 and the single power interface 4 of JP4. At this time, the first main controller module U2 can work normally. If no operation is performed, such as Figure 6, the power supply system where the sound and light alarm module is located (the corresponding ground is AGND) does not have 24V power supply and therefore cannot work. The first main controller module U2 and the optocoupler N1 can recognize that the 24VDC power supply of the enhanced power interface 1 and enhanced power interface 2 of JP4 is not connected through the low level of the 24_Dect pin. At this time, the first main controller module U2 first drives the Set_Rly pin to change the negative pole (the fourth contact 4, the fifth contact 5) and the positive pole (the eighth contact 8, the ninth contact 9) of the magnetic latching relay k1 from the open state to the closed state. After closing, AGND and GND merge into a common ground, and 24 also merges into a positive power supply system through the D14 and D15 diodes, 24V+ power supply and the fire second bus L+. The merged power supply can be used to control the power supply for the first main controller module U2, as well as the sound and light power supply. And because there is only one power supply system, there is no loop communication failure problem caused by the common ground or common positive pole of the two power supply systems.

[0033] The technology of the present invention lies in: through the first power system clutch module and the first 24V communication isolation module, automatic identification and automatic switching of four-wire and two-wire working modes are realized, the sound and light communication signals run stably, and the power and ground of the two groups of power lines are physically isolated.

[0034] For the identification of 24V+ power supply, the threshold method is adopted, that is, Figure 2 As shown, when the voltage division value of resistor R256 and resistor R262 is less than the operating voltage on the light-emitting diode side of the optocoupler N1 (generally 1.2V), it is considered that there is no power input on the 24V+ side, which can effectively ensure that the voltage on the 24V+ side is high enough and stable.

[0035] For non-editing and addressing type applications, in order to facilitate on-site application, the present invention directly uses the dial switch SW1 to select the addressing and non-editing modes. When the No. 2 dial switch of SW1 is turned to ON, the first main controller module U2 determines that it is in the non-editing mode, that is, the sound and light will work as long as the power supply system of the sound and light is powered. On the contrary, when the dial switch is turned to OFF, the first main controller module U2 determines that it is in the non-editing mode, and the communication between the fire protection bus 2 and the controller must be used to start the sound and light by the controller.

[0036] The specific implementation method is described as follows: Figure 6 In the figure, the peak-to-peak value of the voltage across the buzzer BP1 is the difference between the voltages at points TP1 and TP2, and the first main controller module U2 is used to implement AD acquisition of the voltage difference between the two points; after the first main controller module U2 is powered on and initialized, regardless of whether it is a four-wire or two-wire working mode, the Set_Rly pin of the first main controller module U2 first drives the negative pole (fourth contact 4, fifth contact 5) and positive pole (eighth contact 8, ninth contact 9) pins of the magnetic holding relay k1 to close.

[0037] The Beep pin of the first main controller module U2 is driven Figure 3 The buzzer driving circuit shown, for 20mH inductance, when the buzzer has a nominal capacitance of 200nF, the driving time is preferably given as 0.2ms (the given driving time is 0.05ms to 0.8ms). For the optimal driving time corresponding to other inductors, the factors that can be considered include the rated current of the inductor, the voltage loaded on the inductor, and the power consumption of the sound and light, so that the inductor energy storage and the power consumption of the sound and light reach a balance. The principle given by the present invention is to select the driving time so that the peak current on the inductor is within the range of 0.1 to 5 times the rated current of the inductor. The nominal capacitance, capacitance deviation, inductance value, rated current and other parameters of the buzzer can be written into the first main controller module U2 through the power interface 3 and the single power interface 4 of JP4 through the fire-fighting dedicated encoder, or directly written into the first main controller module U2 when burning the parameters of the first main controller module U2.

[0038] When the Beep pin of the first main controller module U2 drives the buzzer to stop, the ADC is immediately used to detect the voltages at points TP1 and TP, and the difference between the voltages at the two points is calculated to obtain a series of AC voltage detection values. The first main controller module U2 analyzes the AC voltage detection value, and the AC cycle time corresponding to the first peak and the first trough of the detection value can obtain the best driving frequency close to the best resonant frequency. The first main controller module U2 can write the best resonant frequency into the EEPROM. After the EEPROM writes the best resonant frequency, the sound and light do not need to be repeatedly calculated when the power is turned on again. There are harmonic components in the AC voltage detection value, and the obtained resonant frequency may have some deviations. The solution is to design a bandpass filter in the first main controller module U2, and the center frequency of the bandpass filter is determined by the nominal capacitance of the buzzer and the basic resonant frequency determined by the inductance value of the buzzer. The bandpass filter is used to filter the above voltage detection value, and the frequency of the AC waveform determined by the first peak and trough after filtering is used as the best resonant frequency of the buzzer. After determining the best resonant frequency of the buzzer, when the buzzer is powered on again, the buzzer is driven at the best driving frequency.

[0039] Embodiment 2 like Figure 3-Figure 5 As shown, another technical solution of another explosion-proof sound and light alarm of the present invention includes a bus power module and a sound and light alarm module, the bus power module provides a fire second bus L+ and a 24V+ power supply, and it also includes: Second bus power module interface: JP1 used to connect the bus power module includes an enhanced power interface and a single power interface. The single power interface L1 and interface L2 are the fire second bus L+ power supply, the enhanced power interface is an isolated auxiliary power supply, the input interface L3 and interface L4 are 24V_IN1 and 24V_IN2 respectively, and are connected to the front-stage 24V_IN+ input terminal of the second 24V isolated power supply through two connectors J1, and the rear-stage output terminal of the second 24V isolated power supply is VCC_24VVCC_24V.

[0040] Second 24V isolated power supply: 24V auxiliary power supply, including a signal isolation circuit composed of transformer T1 and optocoupler N1, whose front-stage voltage end is connected to 24V+ of the second bus power module. After the front stage (left side of the dotted line) is electrically isolated, the output voltage of the rear stage VCC_24V of the isolation circuit is 28V. The output of the second 24V isolated power supply has two connectors J1 connected to the second power system clutch module.

[0041] The second power supply system clutch module includes a diode D1, the anode of the diode D1 is connected to the VCC_24V power supply of the second 24V isolated power supply module, the anode of the diode D2 is connected to the fire second bus L+ power supply, and the power supply V+ where the cathode of the diode D2 and the cathode of the diode D1 converge provides 24V power supply for the sound and light alarm module.

[0042] When the fire second bus L+ and 24V+ power supply dual power supply system is in four-wire working mode, the second 24V isolated power supply is the output terminal VCC_24V of the voltage 28V to provide 24V power supply to the sound and light alarm module, and the high-level signal triggers the diodes D1 and D2 to turn on. When the fire second bus L+ is in two-wire working mode, there is no auxiliary power supply second 24V isolated power supply, the low-level signal triggers the diode D1 to turn off, and the fire second bus L+ provides 24V power supply to the sound and light alarm module.

[0043] The second DC power supply detection module: its front end has or is not connected to the second 24V isolated power supply of VCC_24V, and its rear end triggers a high or low level signal to be transmitted to the first main controller module U2 accordingly; including: one end of the resistor R6 is connected to the input end VCC_24V, the other end of the resistor R6 is connected in series with the resistor R7, and the resistor R7 is also connected in parallel with the capacitor C8 with a capacitance of 10uF and then grounded.

[0044] The second main controller module U2: obtains the high or low level signal of the second DC power supply detection module to determine the 24V+ power supply connection; if it is determined that the 24V+ power supply is connected, the second DC power supply detection module U2 receives the sound and light start command of the controller and sends the sound and light drive signal to the sound and light alarm module; if it is determined that the 24V+ power supply is not connected, the second main controller module U2 sends a 24V fault message to the controller or sends the sound and light drive signal to the sound and light alarm module only when the SW1 pin is closed.

[0045] Sound and light alarm module: It is powered by 24V power V+ of the clutch module of the second power system, and receives the sound and light driving signal of the second main controller module U2 to control the buzzer to emit warning light and alarm sound.

[0046] The technical effect of the explosion-proof sound and light alarm of Example 2 is that the signal isolation of the second 24V isolated power supply solves the influence of distributed capacitance on loop waveform and loop communication when the 24V+ power supply and the fire second bus L+ loop are powered at the same time.

[0047] The VCC_24V output voltage of the second 24V isolated power supply is 28V, which is higher than the maximum voltage of 27.4V of the loop fire protection second bus L+ power supply. Therefore, during normal operation, the second 24V isolated power supply is the main power supply, and the loop fire protection second bus L+ power supply is used as an auxiliary power supply to reduce the power consumption of the loop power supply and further increase the number of sound and light carried by the loop.

[0048] The front-stage grounding of the second 24V isolated power supply is AGND, and the rear-stage grounding is GND. The output of the second 24V isolated power supply is connected to the loop fire protection bus 2 L+ power supply through D1 and the common power supply V+ through D2. The output GND of the second 24V isolated power supply is directly connected to the fire protection bus 2 L+ power supply, which increases the flexibility of the system's on-site installation and configuration.

[0049] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. An explosion-proof sound and light alarm, comprising a first bus power module and a sound and light alarm module, characterized in that: It also includes: The first bus power module interface: including an enhanced power interface and a single power interface; First bus power module: connects the enhanced power interface and the single power interface, and provides fire protection second bus L+ power and\or 24V+ power; The first DC power supply detection module: used to detect whether the front end of the optical coupler N1 obtains 24VDC connected to the first bus power supply module, and the back end triggers high or low different level signals; The first main controller module U2: obtains the connection identification of the 24VDC power supply of the high or low level signal of the first DC power supply detection module, and determines whether the signal is isolated, specifically including: If it is determined that a 24VDC power supply is connected, the first main controller module U2 sends a power separation signal R_Rly to the first 24V communication isolation module in an isolated state to generate an isolated power separation signal R_Rlydri and send it to the first power system clutch module. At the same time, the first main controller module U2 receives the sound and light start instruction of the controller, sends the sound and light drive signal to the first 24V communication isolation module in an isolated state for signal isolation and then sends it to the sound and light alarm module; otherwise: If it is determined that there is no 24VDC power supply connected, the first main controller module U2 sends a power merging signal Set_Rly to the first power system clutch module, and the first main controller module U2 receives the sound and light start instruction of the controller, and sends the sound and light drive signal to the first 24V communication isolation module in a non-isolated state without signal isolation and sends it to the sound and light alarm module; The first power system clutch module: if the front end obtains the isolated power separation signal R_Rlydri, the L+ power system and the 24V+ power system circuit are disconnected to form two independent power systems; if the back end obtains the power merging signal Set_Rly, the fire protection bus L+ power system and the 24V+ power system circuit are closed to form one power system; Sound and light alarm module: powered by the 24VDC direct current of the clutch module of the first power supply system, receives the sound and light driving signal of the first 24V communication isolation module to drive the buzzer circuit to emit warning light and alarm sound.

2. The explosion-proof sound and light alarm according to claim 1, characterized in that: The 24V+ power grounding of the front end of the first DC power supply detection module, the front end of the first 24V communication isolation module, the front end of the first power system clutch module and the first bus power supply module are all AGND; The first main controller module U2, the rear end of the first DC power supply detection module, the rear end of the first 24V isolation power supply module, the rear end of the first power supply system clutch module and the first bus power supply module L+ power ground are all GND.

3. The explosion-proof sound and light alarm according to claim 1, characterized in that: The optocoupler N1 of the first DC power supply detection module includes: a diode at the front end and a phototransistor at the rear end, the first pin of the diode is connected to the voltage divider resistor R256 and one end of the resistor R262, the other end of the resistor R256 is connected to 24VDC, the other end and the second pin of the resistor R262 are grounded, the fourth pin of the phototransistor is connected to the DC power supply, the third pin of the phototransistor is connected to the resistor R255 and the ground, and the third pin of the phototransistor is connected to the first main controller module U2.

4. The explosion-proof sound and light alarm according to claim 1, characterized in that: The first 24V communication isolation module includes multiple isolation chips, including at least isolation chips U39~U41, wherein the isolation chip U39 obtains the power separation signal R_Rly, and the isolation chips U40~U41 are used to obtain the acoustic-optical driving signals.

5. The explosion-proof sound and light alarm according to claim 1, characterized in that: The two power supply systems of the clutch module of the first power supply system are specifically: the front end of the magnetic latching relay k1: including a front end coil, a front end control circuit, a fifth contact and an eighth contact connected to each other, the eighth contact is connected to a 24V+ power supply output terminal, and the fifth contact and the front end of the relay are grounded; the front end control circuit obtains the isolated power separation signal R_Rlydri, and controls the fourth and fifth contacts and the eighth and ninth contacts to be in a disconnected state; A power supply system of the clutch module of the first power supply system is specifically as follows: the rear end of the magnetic holding relay k1: having a rear end coil, a rear end control circuit, a fourth contact and a ninth contact connected to each other, the ninth contact is connected to the fire bus 2 L+ power supply output terminal, the fourth contact and the rear end control circuit are grounded; the 24V+ power supply terminal is connected in series with a diode D14 to output 24VDC, the fire bus 2 L+ is connected in series with a diode D15 to output power V+, the rear end control circuit obtains a power merging signal Set_Rly, and controls the fourth and fifth contacts and the eighth and ninth contacts to be in a closed state.

6. The explosion-proof sound and light alarm according to claim 5, characterized in that: The front-end control circuit of the power system clutch module includes: one end of the front-end coil is connected to 24VDC, the other end is connected to the third pin of the transistor Q9, the first pin of the transistor Q9 is connected to one end of the resistor R56, the other end of the resistor R56 is the isolated power separation signal R_Rlydri, and the second pin of the transistor Q9 is connected to R261 and the ground AGND.

7. The explosion-proof sound and light alarm according to claim 6, characterized in that: The rear-end control circuit of the power system clutch module includes: one end of the rear-end coil is connected to the power supply V+, and the other end is connected to the third pin of the transistor Q10, the first pin of the transistor Q10 is connected to one end of the resistor R258, the other end of the resistor R258 is the power merging signal Set_Rly end, and the second pin of the transistor Q10 is connected to R260 and the ground GND.

8. An explosion-proof sound and light alarm, comprising a second bus power module and a sound and light alarm module, characterized in that: It also includes: The second bus power module interface: including an enhanced power interface and a single power interface; Second bus power supply module: used to connect the enhanced power supply interface and the single power supply interface, and provide the fire protection second bus L+ power supply and\or the second 24V isolated power supply; The second 24V isolated power supply: includes a signal isolation circuit composed of a transformer T1 and an optical coupler N1, whose front-stage voltage terminal is connected to the 24V+ of the second bus power module, and the voltage of the rear-stage output terminal VCC_24V of the isolation circuit is 28V; The second power system clutch module: includes a diode D1 anode connected to the output terminal VCC_24V of the second 24V isolated power module, a diode D2 anode connected to the fire second bus L+ power supply, a diode D2 cathode and a diode D1 cathode converge to provide 24V power supply for the power supply V+, and a high or low level signal at the power input terminal VCC_24V triggers the diode D1 to turn on or off to realize a single power supply or dual power supply system; The second DC power supply detection module: its front-end power input terminal VCC_24V is connected to or not connected to the second 24V isolated power supply, and its back-end triggers a high or low level signal accordingly; The second main controller module U2: obtains the high or low level signal of the second DC power supply detection module to determine the connection of the 24V+ power supply; if it is determined that the 24V+ power supply is connected, the second DC power supply detection module U2 receives the sound and light start command of the controller, and sends the sound and light drive signal to the sound and light alarm module; if it is determined that the 24V+ power supply is not connected, the second main controller module U2 sends a 24V fault message to the controller or sends the sound and light drive signal to the sound and light alarm module only when the SW1 pin is closed; Sound and light alarm module: It is powered by 24V V+ of the second power system clutch module, and receives the sound and light driving signal of the second main controller module U2 to control the buzzer to emit warning light and alarm sound.

9. The explosion-proof sound and light alarm according to claim 8, characterized in that: The second DC power supply detection module includes: one end of the resistor R6 is connected to the power input terminal VCC_24V, the other end of the resistor R6 is connected in series with the resistor R7, and the resistor R7 is also connected in parallel with the capacitor C8 with a capacitance of 10uF and then grounded.

10. The explosion-proof sound and light alarm according to claim 8, characterized in that: The second bus power module, the second power system clutch module, the second main controller module U2 and the second 24V isolated power supply are grounded at the rear stage to GND, and the second 24V isolated power supply is grounded at the front stage to AGND.

Images