Explosion-proof audible and visual alarm

Abstract

The utility model discloses an explosion-proof audible and visual alarm, which comprises a bus power supply module, an audible and visual alarm module, a first bus power supply module interface, a second bus power supply module interface, a third bus power supply module interface, a fourth bus power supply module interface, a fifth bus power supply module interface, a sixth bus power supply module interface, a fifth bus power supply module interface and a sixth bus power supply module interface, the first main controller module U2 receives and feeds back communication signals and is connected and powered by a fire-fighting two-bus power supply, the first 24V communication isolation module comprises a magnetic latching relay, and a control power supply 24V + and a fire-fighting two-bus form a power supply system or two independent power supply systems; the 24DVC voltage output end connected with the first power system clutch module receives signals of the first 24V communication isolation module or the first main controller module U and outputs the signals to the buzzer drive circuit to give out warning sound. According to the explosion-proof audible and visual alarm of the utility model, two-wire and four-wire working modes are adaptively switched.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fire fighting, and specifically design the equipment of sound and light alarm, especially the explosion -proof sound and light alarm. BACKGROUND

[0002] The explosion -proof sound and light alarm is the sound and light alarm commonly used in the industry fire fighting industry. In the fire fighting industry, the general type of sound and light is: two lines (fire fighting two buses or 24V+) explosion -proof sound and light; four lines (fire fighting two buses and 24V+) explosion -proof sound and light two. For the four lines of explosion -proof sound and light, the common practice in the industry is that 24V+ is used for power supply, and fire fighting two buses are used for communication, only 24V+ or only loop is provided, and the explosion -proof sound and light cannot work normally. This greatly limits the application scene of the explosion -proof sound and light, for example, when there are only two lines for power supply on site, the sound and light of four lines cannot be applied. For another example, when the sound and light intensity needs to be increased on site, the sound and light of two lines cannot meet the use requirement. Based on this, the patent provides an explosion -proof sound and light that can meet two line working and four line working.

[0003] The reason why the explosion -proof sound and light needs four line working is that the power of fire fighting two buses is limited, cannot provide enough power for the sound and light, so that the number of sound and light with load on the bus is limited, and the sound intensity and light intensity of the sound and light are also limited. Using four lines can realize that fire fighting two buses are used for communication, and 24V+ is used for sound and light power supply, and communication, sound intensity and light intensity are considered. However, one disadvantage of four lines is that the number of on-site cables is doubled compared with two lines, increasing the cost and the difficulty of on-site wiring. In some occasions where the number of sound and light is not much, the sound intensity and light intensity requirement is not high, the demand for two line sound and light is also very urgent. The visible sound and light on the market is two lines or four lines, and there are few sound and light alarm products compatible with four lines and two lines.

[0004] When the explosion -proof sound and light uses four line working mode, two lines are used for fire fighting loop communication, and the other two lines are used for sound and light alarm power supply. In this working mode, in order to ensure the stable operation of sound and light communication, the power supply and ground of the two groups of power supply lines must be physically isolated, otherwise the fire fighting two bus loop will have communication failure. The explosion -proof sound and light of four lines can be divided into addressable type and non-addressable type according to the working mode. 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, and the non-addressable type starts the sound and light as long as the power supply. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem to provide an explosion -proof sound and light alarm, which meets two line and four line working mode, and two line and four line working mode are automatically switched, the number of sound and light with load on the bus is not limited, and the sound intensity and light intensity of the sound and light are not restricted, especially the stable operation of sound and light communication after isolation.

[0006] In order to solve the above technical problems, an explosion-proof sound and light alarm is provided, comprising a first bus power module and a sound and light alarm module, characterized in that it further comprises:

[0007] The first bus power module interface comprises an enhanced power interface and a single power interface;

[0008] The first bus power module connects the enhanced power interface and the single power interface, and provides a fire bus L+ power supply and / or a 24V+ power supply;

[0009] The first DC power detection module is used to detect whether the power supply 24VDC of the first bus power module is connected or not connected at the front end of the optocoupler N1, and to trigger a high or low different level signal at the rear end;

[0010] The first main controller module U2 obtains the high or low level signal of the first DC power detection module;

[0011] The first 24V communication isolation module: the first main controller module U2 sends a power separation signal R_Rly to the first 24V communication isolation module in an isolated state, and the first 24V communication isolation module generates an isolated power separation signal R_Rlydri and sends it to the first power system clutch module, while 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; or:

[0012] The first main controller module U2 sends a power combination 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 to the sound and light alarm module;

[0013] The first power system clutch module: if the isolated power separation signal R_Rlydri is obtained at the front end, the circuit of the L+ power system and the 24V+ power supply is disconnected to form two independent power systems; if the power combination signal Set_Rly is obtained at the rear end, the circuit of the fire bus L+ power system and the 24V+ power system is closed to form one power system;

[0014] The sound and light alarm module is powered by 24VDC direct current from the first power system clutch module, and receives the sound and light drive signal from the first 24V communication isolation module.

[0015] Further, the front end of the first DC power 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 supply ground of the first bus power module are all AGND;

[0016] The first main controller module U2, the first DC power supply detection module rear end, the first 24V isolation power supply module rear end, the first power system clutch module rear end, and the first bus power supply module L+ power supply rear ground.

[0017] Further, the first DC power supply detection module optocoupler N1 includes: a diode at the front end and a photosensitive triode at the rear end, the first pin of the diode is connected to one end of the voltage dividing resistor R256 and 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, the fourth pin of the photosensitive triode is connected to a DC power supply, the third pin of the photosensitive triode is connected to the resistor R255 and the ground, and the third pin of the photosensitive triode is connected to the first main controller module U2.

[0018] Further, the first 24V communication isolation module includes a plurality of isolation chips, at least including isolation chips U39-U41, wherein the isolation chip U39 obtains the power supply separation signal R_Rly, and the isolation chips U40-U41 are used to obtain the sound sound light drive signal.

[0019] Further, the two power supply systems of the first power system clutch module are: the front end of the magnetic latching relay k1 includes the front end coil, the front end control circuit, the fifth contact, and the eighth contact connected to each other, the eighth contact is connected to the 24V+ power output end, the fifth contact and the relay front end are grounded; the front end control circuit obtains the isolation power supply separation signal R_Rlydri, and controls the fourth and fifth contacts and the eighth and ninth contacts to be disconnected.

[0020] One of the power supply systems of the first power system clutch module is specifically: the rear end of the magnetic latching relay k1 has the rear end coil, the rear end control circuit, the fourth contact, and the ninth contact connected to each other, the ninth contact is connected to the fire-fighting second bus L+ power output end, the fourth contact and the rear end control circuit are grounded; the 24V+ power end is connected in series with the diode D14 to output 24VDC, and the fire-fighting second bus L+ is connected in series with the diode D15 to output the power supply V+, and the rear end control circuit obtains the power supply merging signal Set_Rly, and controls the fourth and fifth contacts and the eighth and ninth contacts to be in a closed state.

[0021] Further, 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 triode Q9, the first pin of the triode Q9 is connected to one end of the resistor R56, the other end of the resistor R56 is the isolation power supply separation signal R_Rlydri, and the second pin of the triode Q9 is connected to R261 and the ground AGND.

[0022] Furthermore, 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 terminal, and the second pin of the transistor Q10 is connected to R260 and ground GND.

[0023] Another technical solution is: an explosion-proof audible and visual alarm, comprising a second bus power supply module and an audible and visual alarm module, characterized in that: it further comprises:

[0024] Second bus power module interface: including enhanced power interface and single power interface;

[0025] Second bus power module: used to connect the enhanced power interface and the single power interface, providing fire protection two-bus L+ power and / or a second 24V isolated power;

[0026] The second 24V isolation power supply includes a signal isolation circuit consisting of transformer T1 and optocoupler N1. Its front-end voltage terminal is connected to the 24V+ of the second bus power supply module, and the VCC_24V output terminal of the isolation circuit is 28V.

[0027] The second power system clutch module includes a diode D1 anode connected to the output terminal VCC_24V of the second 24V isolation power module, a diode D2 anode connected to the fire protection bus L+ power supply, and a diode D2 cathode and a diode D1 cathode combined to provide 24V power supply to power supply V+. A high or low level signal at the power input terminal VCC_24V triggers diode D1 to turn on or off to realize a single power supply or dual power supply system.

[0028] Second DC power supply detection module: Its front-end power input terminal VCC_24V is connected to the second 24V isolation power supply or not, and its back-end triggers a high or low level signal accordingly.

[0029] The second main controller module U2: acquires the high or low level signal from the second DC power supply detection module to determine the 24V+ power supply connection; if the 24V+ power supply is confirmed to be connected, the second DC power supply detection module U2 receives the audible and visual start command from the controller and sends the audible and visual drive signal to the audible and visual alarm module; if the 24V+ power supply is not confirmed to be connected, the second main controller module U2 sends a 24V fault message to the controller or sends the audible and visual drive signal to the audible and visual alarm module only when the SW1 pin is closed.

[0030] Audible and visual alarm module: It is powered by 24V from the V+ of the second power system clutch module and receives the audible and visual drive signal from the second main controller module U2 to control the buzzer to emit warning light and alarm sound.

[0031] Furthermore, the second DC power supply detection module includes: one end of resistor R6 is connected to the power input terminal VCC_24V, the other end of resistor R6 is connected in series with resistor R7, and resistor R7 is also connected in parallel with a 10uF capacitor C8 and then grounded.

[0032] Furthermore, the rear-stage ground of the second bus power module, the second power system clutch module, the second main controller module U2, and the second 24V isolation power supply is GND, and the front-stage ground of the second 24V isolation power supply is AGND.

[0033] The technical advantage of this invention is that when the explosion-proof audible and visual alarm device operates with two wires (whether it is a fire-fighting two-wire bus or 24V+), the combined power supply can supply power to both the main controller module MCU (U2) and the audible and visual alarm module's 24V power supply. Since there is only one power supply system, there is no loop communication failure problem caused by two power supply systems sharing a common ground or a common positive terminal.

[0034] When the explosion-proof audible and visual alarm of this utility model uses a four-wire operating mode, two wires are used for fire circuit communication, and the other two wires are used for audible and visual power supply. In this operating mode, to ensure stable operation of audible and visual communication, in Scheme 1, the communication between the two power systems (corresponding grounds GND and AGND) is achieved through optocoupler N1 and isolation chips U39~U41. In addition, through the magnetic latching relay k1 of the first power system clutch module, the power supply and ground of the two sets of power lines are physically isolated.

[0035] In Embodiment 2, this invention employs a second 24V isolated power supply for signal isolation, which addresses the impact of distributed capacitance on the circuit waveform and communication when the 24V+ power supply and the fire protection bus L+ circuit are powered simultaneously. In four-wire operating mode, the second 24V isolated power supply provides 24V power to the main power supply, while the fire protection bus L+ circuit serves as an auxiliary power supply, reducing circuit power consumption and further increasing the number of audio-visual devices that the circuit can carry.

[0036] One of the two technical solutions in the implementation of this utility model is that it can meet the two-wire and four-wire working modes, and automatically switch between the two-wire and four-wire working modes during operation. The number of audio-visual devices carried on the bus, the sound intensity and light intensity of the audio-visual devices are not limited or constrained. In particular, the audio-visual communication can operate stably after isolation and is not affected by signal interference. Attached Figure Description

[0037] Figure 1 This is a module diagram of Embodiment 1 of the explosion-proof audible and visual alarm of this utility model;

[0038] Figure 2 This is a circuit diagram of Embodiment 1 of the explosion-proof audible and visual alarm of this utility model;

[0039] Figure 3 This is a module diagram of Embodiment 2 of the explosion-proof audible and visual alarm of this utility model;

[0040] Figures 4-5 This is a circuit diagram of Embodiment 2 of the explosion-proof sound and light alarm of this utility model;

[0041] Figure 6 This is a schematic diagram of the buzzer drive circuit of the explosion-proof sound and light alarm of this utility model; Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] Example 1

[0046] like Figure 1 , Figure 2 and Figure 6 As shown, this utility model discloses an explosion-proof audible and visual alarm, which includes a first bus power supply module and an audible and visual alarm module.

[0047] 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, providing fire protection dual bus L+ and / or 24V+ power. Figure 2 As shown, when the fire protection bus is connected to the power supply terminal JP4, there are four interfaces: L+ power interface: single power interface 3 and single power interface 4, and 24V+ power interface: enhanced power interface 1 and enhanced power interface 2.

[0048] The first DC power supply detection module is used to detect whether the optocoupler N1 is connected to the first bus power supply module (24VDC) and triggers different high or low level signals at the back end. The specific circuit structure of 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 one end of the voltage divider resistors R256 and R262. The other end of resistor R256 is connected to 24VDC. The other end of resistor R262 and its second pin are grounded to AGND. The fourth pin of the phototransistor is connected to the DC power supply. The third pin of the phototransistor is connected to resistor R255. The third pin of the phototransistor is connected to the first main controller module U2.

[0049] Figures 1-2 As shown, the first main controller module U2 obtains the high or low level signal of the first DC power supply detection module and determines whether the 24VDC power supply is isolated.

[0050] First 24V communication isolation module: may include multiple isolation chips, in this embodiment including isolation chips U39~U41. First power system clutch module magnetic latching relay k1 front end: includes interconnected front end coil, front end control circuit, fifth contact and eighth contact, the eighth contact is connected to a 24V+ power output terminal, and the fifth contact and relay front end are grounded;

[0051] The magnetic latching relay k1 has an interconnected rear coil, a rear control circuit, a fourth contact, and a ninth contact. The ninth contact is connected to the L+ power output terminal of the fire protection bus, while the fourth contact and the rear control circuit are grounded. The 24V+ power supply terminal outputs 24VDC via diode D14 in series, and the fire protection bus L+ outputs V+ via diode D15 in series. The rear control circuit receives the power merging signal Set_Rly and controls the fourth and fifth contacts, as well as the eighth and ninth contacts, to be in a closed state.

[0052] The following explanations are divided into four-line and two-line working modes:

[0053] 1) When operating in four-wire mode, the fire protection bus is connected to terminals 3 and 4 of JP4, and the 24V+ power supply is connected to terminals 1 and 2 of JP4. The first main controller module U2 can be powered by the fire protection bus, while the audible and visual alarm module requires 24V DC power. Communication signals must be isolated.

[0054] For the isolated communication section: When the optocoupler N1 detects a 24VDC power supply connection, the first main controller module U2 and optocoupler N1 can identify the 24VDC power supply access of JP4's enhanced power interface 1 and enhanced power interface 2 via the 24_Dect pin. When there is power on the 24V side, the 24_Dect pin outputs a high level. 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, which is then sent to the first power system clutch module. Simultaneously, the first main controller module U2 receives the controller's audio-visual activation command, sends audio-visual drive signals (CAP_C, BeeP, Light, 62S_EN) to the isolated isolation chips U39~U41 for signal isolation, and then sends the isolated audio-visual drive signals (CAP_Ctr, BeeP_Ctr, LightCtr, 62S_EN_Ctr) to the audio-visual alarm module.

[0055] The first power system clutch module: The front-end control circuit obtains the isolation power separation signal R_Rlydri to trigger the circuits of the L+ power system and the 24V+ power system to disconnect into two independent power systems. The process is as follows: The magnetic latching relay k1 controls its negative fourth contact 4 and fifth contact 5 and positive eighth contact 8 and ninth contact 9 to be physically isolated. The L+ power supply and the 24V+ power supply are two independent power supplies. The 24V+ power supply powers the audible and visual alarm module. They do not affect each other, ensuring the stability of the fire circuit two-bus communication data.

[0056] Therefore, in four-wire operation mode, communication between the two power systems (corresponding to grounds GND and AGND respectively) is achieved through optocoupler N1 and isolation chips U39~U41.

[0057] 2) When operating on two wires (whether it's a circuit or a fire alarm bus), the L+ power interface is connected to the single power interface 3 and single power interface 4 of JP4. At this time, the first main controller module U2 can operate normally. If no operation is performed, such as... Figure 6The power system of the audible and visual alarm module (corresponding to ground AGND) lacks 24V power and therefore cannot operate. The first main controller module U2 and optocoupler N1, through the low level of the 24_Dect pin, can detect that the 24VDC power supply to optocoupler N1 at enhanced power interfaces 1 and 2 of JP4 is not connected. At this time, the first main controller module U2 first drives the Set_Rly pin to change the negative (fourth contact 4, fifth contact 5) and positive (eighth contact 8, ninth contact 9) contacts of the magnetic latching relay k1 from the open state to the closed state. After closing, AGND and GND merge into a common ground. 24V also merges into a positive power system through diodes D14 and D15, connecting the 24V+ power supply and the fire alarm bus L+. The merged power supply can power both the first main controller module U2 and the audible and visual alarm. Furthermore, since there is only one power system, there is no loop communication failure problem caused by two power systems sharing a common ground or positive terminal.

[0058] The technology of this utility model is as follows: through the first power system clutch module and the first 24V communication isolation module, the automatic identification and automatic switching of four-wire and two-wire working modes are realized, the sound and light communication signals operate stably, and the power supply and ground of the two sets of power lines are physically isolated.

[0059] For the identification of 24V+ power supply, a threshold method is used, namely... Figure 2 As shown, when the voltage division value of resistors R256 and R262 is less than the operating voltage of the LED side of optocoupler N1 (typically 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 sufficiently high and stable.

[0060] For both non-linear and addressable applications, this invention directly uses a DIP switch SW1 to select between addressable and non-linear modes for ease of field application. When DIP switch 2 of SW1 is turned ON, the first main controller module U2 determines it to be in non-linear mode, meaning the audio-visual system will activate whenever power is supplied. Conversely, when the DIP switch is turned OFF, the first main controller module U2 determines it to be in non-linear mode, requiring communication between the fire alarm bus and the controller for the controller to activate the audio-visual system.

[0061] The specific implementation method is described as follows: Figure 6 In the process, the peak-to-peak value of the voltage across the buzzer BP1 is the difference between the voltages at points TP1 and TP2. The first main controller module U2 performs 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 operating mode, the Set_Rly pin of the first main controller module U2 first drives the negative (fourth contact 4, fifth contact 5) and positive (eighth contact 8, ninth contact 9) pins of the magnetic latching relay k1 to close.

[0062] Beep pin driver for the first main controller module U2 Figure 3 The buzzer drive circuit shown has a preferred drive time of 0.2ms for a 20mH inductor and a 200nF nominal capacitor (the possible drive times are 0.05ms to 0.8ms). For other inductors, the optimal drive time should consider factors such as the inductor's rated current, the voltage applied to the inductor, and the power consumption of the sound and light, aiming to balance the inductor's energy storage and the sound and light power consumption. The principle given in this invention is to select the drive time within the range of 0.1 to 5 times the inductor's rated current, ensuring the peak current on the inductor is within this range. The buzzer's nominal capacitance, capacitance deviation, inductance value, and rated current can be written to the first main controller module U2 via the power interface 3 and single power interface 4 of the JP4 using a fire-fighting encoder, or directly written to the first main controller module U2 during the parameter programming process.

[0063] As soon as the buzzer is driven by the Beep pin of the first main controller module U2 ends, it immediately uses an ADC to detect the voltage at points TP1 and TP, and calculates the difference between the two voltages, obtaining a series of AC voltage detection values. The first main controller module U2 analyzes these AC voltage detection values. The AC cycle time corresponding to the first peak and the first trough of these values ​​can yield an optimal driving frequency close to the optimal resonant frequency. The first main controller module U2 can write the optimal resonant frequency into the EEPROM. After the optimal resonant frequency is written into the EEPROM, the optimal resonant frequency does not need to be recalculated when the sound and light system is powered on again. Since the AC voltage detection values ​​contain harmonic components, the obtained resonant frequency may have some deviation. The solution is to design a bandpass filter in the first main controller module U2. The center frequency of the bandpass filter is determined by the fundamental resonant frequency determined by the nominal capacitance and inductance of the buzzer. Using this bandpass filter to filter the above voltage detection values, the frequency of the AC waveform determined by the first peak and trough after filtering is taken as the optimal resonant frequency of the buzzer. After determining the optimal resonant frequency of the buzzer, when the buzzer is powered on again, it is driven at the optimal driving frequency.

[0064] Example 2

[0065] like Figures 3-5 As shown, another technical solution for an explosion-proof audible and visual alarm of this utility model is provided, including a bus power supply module and an audible and visual alarm module. The bus power supply module provides fire-fighting dual bus L+ and 24V+ power, and also includes:

[0066] 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 L2 are for the fire protection second bus L+ power supply, and the enhanced power interface is for the isolated auxiliary power supply. The input interfaces L3 and L4 are 24V_IN1 and 24V_IN2, respectively. They are connected to the front-end 24V_IN+ input terminal of the second 24V isolated power supply through two connectors J1. The rear-end output terminal of the second 24V isolated power supply is VCC_24V.

[0067] The second 24V isolated power supply: a 24V auxiliary power supply, including a signal isolation circuit consisting of transformer T1 and optocoupler N1. Its front-end voltage terminal is connected to the 24V+ of the second bus power module. After electrical isolation of the front stage (left side of the dotted line), the output voltage of the VCC_24V stage of the isolation circuit is 28V. The two connectors J1 of the output of the second 24V isolated power supply are connected to the clutch module of the second power system.

[0068] The second power system clutch module includes diode D1. The anode of diode D1 is connected to the VCC_24V power supply of the second 24V isolated power supply module. The anode of diode D2 is connected to the L+ power supply of the fire alarm bus. The V+ power supply, which is the junction of the cathodes of diode D2 and diode D1, provides 24V power to the audible and visual alarm module.

[0069] When the fire alarm system operates in a four-wire dual-power supply mode (L+ and 24V+), the second 24V isolated power supply (VCC_24V, 28V) provides 24V power to the audible and visual alarm module, and a high-level signal triggers diodes D1 and D2 to conduct. When the fire alarm system operates in a two-wire mode (L+), there is no auxiliary power supply (second 24V isolated power supply), and a low-level signal triggers diode D1 to cut off, allowing the fire alarm system to provide 24V power to the audible and visual alarm module.

[0070] The second DC power supply detection module: its front end may or may not be connected to a second 24V isolated power supply VCC_24V, and its rear end will trigger a high or low level signal to be sent to the first main controller module U2; including: one end of resistor R6 is connected to VCC_24V, the other end of resistor R6 is connected in series with resistor R7, and resistor R7 is also connected in parallel with a 10uF capacitor C8 and then grounded.

[0071] The second main controller module U2: acquires the high or low level signal from the second DC power supply detection module to determine the 24V+ power supply connection; if the 24V+ power supply is confirmed to be connected, the second DC power supply detection module U2 receives the audible and visual start command from the controller and sends the audible and visual drive signal to the audible and visual alarm module; if the 24V+ power supply is not confirmed to be connected, the second main controller module U2 sends a 24V fault message to the controller or sends the audible and visual drive signal to the audible and visual alarm module only when the SW1 pin is closed.

[0072] Audible and visual alarm module: It is powered by 24V from the power supply V+ of the second power system clutch module, and receives the audible and visual drive signal from the second main controller module U2 to control the buzzer to emit warning light and alarm sound.

[0073] The technical effect of the explosion-proof audible and visual alarm in Example 2 is that the signal isolation of the second 24V isolation power supply solves the problem of the influence of distributed capacitance on the circuit waveform and circuit communication when the 24V+ power supply and the fire protection bus L+ circuit are powered at the same time.

[0074] The VCC_24V output voltage of the second 24V isolated power supply is 28V, which is higher than the highest voltage of 27.4V of the circuit fire protection bus L+ power supply. Therefore, during normal operation, the second 24V isolated power supply is the main power supply, and the circuit fire protection bus L+ power supply serves as an auxiliary power supply, which can reduce the power consumption of the circuit power supply and further increase the number of sound and light loads on the circuit.

[0075] The front-end ground of the second 24V isolated power supply is AGND, and the rear-end ground is GND. The output of the second 24V isolated power supply is connected to the L+ power supply of the fire protection bus through D1 and the V+ power supply of the fire protection bus through D2. The output GND of the second 24V isolated power supply is directly connected to the L+ power supply of the fire protection bus, which increases the flexibility of the system's on-site installation and configuration.

[0076] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. An explosion-proof audible and visual alarm, comprising a first bus power supply module and an audible and visual alarm module, characterized in that: It also includes: First bus power module interface: including enhanced power interface and single power interface; First bus power module: connects the enhanced power interface and the single power interface, providing fire protection two-bus L+ power and / or 24V+ power; First DC power supply detection module: used to detect whether the optocoupler N1 front end has acquired the 24VDC power supply of the first bus power module or not, and triggers high or low level signals at the back end. First main controller module U2: Acquires high or low level signals from the first DC power supply detection module; First 24V Communication Isolation Module: The first main controller module U2 sends a power separation signal R_Rly to the first 24V communication isolation module in isolation state. The first 24V communication isolation module generates an isolation power separation signal R_Rlydri and sends it to the first power system clutch module. At the same time, the first main controller module U2 receives the controller's audible and visual activation command, sends an audible and visual drive signal to the first 24V communication isolation module in isolation state for signal isolation, and then sends it to the audible and visual alarm module; or: The first main controller module U2 sends a power merging signal Set_Rly to the first power system clutch module. The first main controller module U2 receives the audible and visual start command from the controller and sends the audible and visual drive signal to the first 24V communication isolation module in the non-isolated state. The signal is sent to the audible and visual alarm module without signal isolation. First power system clutch module: If the front end obtains the isolation power separation signal R_Rlydri, it triggers the circuit of L+ power system and 24V+ power to disconnect into two isolated power systems; if the back end obtains the power merging signal Set_Rly, it sends the fire-fighting two-bus L+ power system and 24V+ power system circuit to close into one power system. Audible and visual alarm module: powered by 24VDC from the clutch module of the first power system, and receives audible and visual drive signals from the first 24V communication isolation module.

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

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

4. The explosion-proof audible and visual alarm device 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 isolation chip U39 acquires the power separation signal R_Rly, and isolation chips U40~U41 are used to acquire the acoustic and optical drive signal.

5. The explosion-proof audible and visual alarm device according to claim 1, characterized in that, The first power system clutch module has two power systems: the front end of the magnetic latching relay k1 includes a front end coil, a front end control circuit, a fifth contact, and an eighth contact that are connected to each other. The eighth contact is connected to a 24V+ power output terminal, and the fifth contact and the front end of the relay are grounded. The front end control circuit obtains the isolation power separation signal R_Rlydri and controls the fourth and fifth contacts and the eighth and ninth contacts to disconnect. The power system of the clutch module of the first power system is as follows: the back end of the magnetic latching relay k1 has an interconnected back end coil, a back end control circuit, a fourth contact and a ninth contact. The ninth contact is connected to the L+ power output terminal of the fire protection bus, and the fourth contact and the back end control circuit are grounded. The output of the 24V+ power terminal is 24VDC through the series diode D14, and the output of the fire protection bus L+ through the series diode D15 is the power supply V+. The back 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.

6. The explosion-proof audible and visual alarm device 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 transistor Q9, the first pin of transistor Q9 is connected to one end of resistor R56, the other end of resistor R56 is the isolation power separation signal R_Rlydri, and the second pin of transistor Q9 is connected to R261 and ground AGND.

7. The explosion-proof audible and visual alarm device according to claim 6, 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 transistor Q10. The first pin of transistor Q10 is connected to one end of resistor R258. The other end of resistor R258 is the power merging signal Set_Rly terminal. The second pin of transistor Q10 is connected to R260 and ground GND.

8. An explosion-proof audible and visual alarm, comprising a second bus power supply module and an audible and visual alarm module, characterized in that: It also includes: Second bus power module interface: including enhanced power interface and single power interface; Second bus power module: used to connect the enhanced power interface and the single power interface, providing fire protection two-bus L+ power and / or a second 24V isolated power; The second 24V isolation power supply includes a signal isolation circuit consisting of transformer T1 and optocoupler N1. Its front-end voltage terminal is connected to the 24V+ of the second bus power supply module, and the VCC_24V output terminal 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 isolation power module, a diode D2 anode connected to the fire protection bus L+ power supply, and a diode D2 cathode and a diode D1 cathode combined to provide 24V power supply to power supply V+. A high or low level signal at the power input terminal VCC_24V triggers diode D1 to turn on or off to realize a single power supply or dual power supply system. Second DC power supply detection module: Its front-end power input terminal VCC_24V is connected to the second 24V isolation power supply or not, and its back-end triggers a high or low level signal accordingly. The second main controller module U2: acquires the high or low level signal from the second DC power supply detection module to determine the 24V+ power supply connection; if the 24V+ power supply is confirmed to be connected, the second DC power supply detection module U2 receives the audible and visual start command from the controller and sends the audible and visual drive signal to the audible and visual alarm module; if the 24V+ power supply is not confirmed to be connected, the second main controller module U2 sends a 24V fault message to the controller or sends the audible and visual drive signal to the audible and visual alarm module only when the SW1 pin is closed. Audible and visual alarm module: It is powered by 24V from the power supply V+ of the second power system clutch module, and receives the audible and visual drive signal from the second main controller module U2 to control the buzzer to emit warning light and alarm sound.

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

10. The explosion-proof audible and visual alarm device 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 rear-stage ground of the second 24V isolation power supply are GND, and the front-stage ground of the second 24V isolation power supply is AGND.

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