JP7478535B2 - Disaster prevention monitoring panel - Google Patents

Description

The present invention relates to a disaster prevention monitoring panel such as a receiver that is equipped with a liquid crystal monitor device and detects and issues an alarm regarding abnormalities such as fires and gas leaks.

Conventionally, fire alarm system receivers are installed in disaster prevention centers or management offices within buildings, and upon receiving fire signals from sensors and transmitters, they display a representative fire warning message, activate main and area sounds, and perform linked control of fire doors and fire shutters, etc.

For this reason, the receiver panel is equipped with indicator lights such as a fire indicator light, a gas leak indicator light, and a fault indicator light, as well as a liquid crystal monitor with a touch panel, a determination switch that determines whether there is a fire or gas leak and cancels the alarm stop or linked stop, a switch that stops the main sound and area sound, and a switch that restores the receiver if there is no fire.

Figure 6 is an explanatory diagram showing an example of a conventional receiver from the front. The receiver 100 shown in Figure 6 has a receiver panel with a door structure arranged on the front of a box-shaped housing, and the receiver panel has a display unit 102, an LCD monitor device 104, an operation unit 106, and a printer 110 arranged thereon, and an acoustic hole 112 with a built-in speaker is provided adjacent to the LCD monitor device 104.

In this type of receiver 100, if the commercial AC power supply is interrupted, the receiver will switch to a backup power supply using a battery to ensure operation for a specified period of time, and during the power outage, the LCD monitor device 104 will display a message indicating that a power outage has occurred. If a fire occurs during a power outage, a fire alarm will be output, and the display of the power outage abnormality on the LCD monitor device 104 will be temporarily erased, with the location of the fire being displayed as a priority.

JP 2017-191418 A JP 2019-204394 A

However, the LCD monitor devices installed in such conventional receivers display disaster prevention information such as power outage abnormalities on the screen even during a power outage while operating on power supplied from a backup power source, and because it is necessary to guarantee that the receiver will operate for more than a certain period of time during a power outage, there is a restriction that only LCD monitor devices with low power consumption can be used.

When the screen size of an LCD monitor device is large, the power consumption also increases, and adopting such a device poses the problem of having to increase the capacity of the battery provided as a backup power source. For this reason, LCD monitor devices with small screen sizes, such as 10 inches, are used.

However, there are only a few types of small-screen LCD monitor devices on the market, and most of them are relatively expensive, meaning there is a limited choice. In addition, the small screen size means that the display of disaster prevention information warning of fires and other hazards is small and difficult to see, and there is also a problem that the amount of information that can be displayed on one screen is limited.

The objective of the present invention is to provide a disaster prevention monitoring panel that enables the use of a large LCD monitor device with a large screen size and high power consumption without increasing the battery capacity of the backup power supply.

(Disaster prevention monitoring panel)
The present invention relates to a disaster prevention monitoring panel that receives an abnormality detection signal from a detector installed in a security zone, issues an alarm, and transmits a control signal to devices installed in the security zone to control them.
A liquid crystal monitor device for displaying disaster prevention information;
A fire representative light that displays a fire representative during a fire outbreak;
A power outage indicator light that shows that a power outage is occurring;
A control unit for controlling the liquid crystal monitor device, the fire warning light, and the power outage warning light;
Established
The control unit
If the device is operating on commercial AC power , operate the LCD monitor.
When a power outage of the commercial AC power supply is detected and the supply of the backup power supply is switched to , the backlight of the liquid crystal monitor device is turned off and the power outage indicator light is activated .
If an abnormality detection signal is received during a power outage , the backlight of the LCD monitor device is turned on .
If the power supply voltage of the standby power supply drops below a predetermined value during a power outage while the backlight of the liquid crystal monitor device is on, the operating power supply of the liquid crystal monitor device is turned off .

(Basic Effects)
The present invention is a disaster prevention monitoring panel that receives an abnormality detection signal from a detector installed in a security area and issues an alarm, and transmits control signals to equipment installed in the security area to control it. The panel is provided with a liquid crystal monitor device that displays disaster prevention information, a power outage indicator light that shows that a power outage is occurring, and a control unit that operates the liquid crystal monitor device while the panel is operating on commercial AC power, and when a power outage of the commercial AC power is detected and the supply of backup power is switched over to, switches the liquid crystal monitor device to a non-display state and operates the power outage indicator light, and when an abnormality detection signal is received during the power outage, releases the non-display state of the liquid crystal monitor device and causes it to display disaster prevention information. Therefore, when the commercial AC power is out and the panel is operating on the backup power source, the power consumption of the liquid crystal monitor device is kept to zero or sufficiently low, making it possible to provide a liquid crystal monitor device with a large screen size that consumes a lot of power, and even when a liquid crystal monitor device with a large screen size is used, it is possible to guarantee an operating time exceeding a specified time for the disaster prevention monitoring panel using the backup power source.

In addition, a large LCD monitor can be installed, allowing disaster prevention information such as the location of a fire to be displayed in a large size, and the amount of information that can be displayed on one screen can be increased, allowing disaster prevention managers and firefighters to easily identify the location of the fire from the screen display in the event of a fire and respond quickly and reliably by rushing to the scene.

In addition, there are many types of large-screen LCD monitor devices available on the market as consumer products, so there are many options, and when it is time to change parts, it is easy to find replacements, making it possible to select and use low-cost products.

(Effect of LCD monitor control due to voltage drop of standby power supply)
In addition, the control unit is configured to switch the LCD monitor device to a non-display state if the power supply voltage of the backup power supply drops below a predetermined value during a power outage.Therefore, even if the LCD monitor device is operating to display disaster prevention information due to a fire that occurs during a power outage, the LCD monitor device will go into a non-display state if the power supply voltage from the backup power supply drops below a predetermined threshold due to battery depletion, thereby reducing power consumption of the backup power supply and making it possible to extend the operating time of the receiver on the backup power supply as much as possible.

(Effect of turning the LCD monitor power on and off)
In addition, the control unit turns off the operating power when the LCD monitor device is in a non-display state and turns on the operating power when the non-display state is canceled. Therefore, when the LCD monitor device is operating on a backup power source due to a power outage, the power consumption of the LCD monitor device becomes zero, and even when a large LCD monitor device with a large screen size that consumes a lot of power is used, it is possible to guarantee an operating time exceeding the specified time of the disaster prevention monitoring panel from the backup power source without increasing the battery capacity of the backup power source.

(Effect of turning the LCD monitor backlight on and off)
In addition, the control unit turns off the backlight to indicate the LCD monitor device's non-display state and turns the backlight on to cancel the non-display state. Therefore, when the LCD monitor device is operating on a backup power source due to a power outage, the power consumption of the LCD monitor device will be standby power of, for example, 1 watt or less. Even if a large LCD monitor device with a large screen size that consumes a lot of power is used, it is possible to guarantee an operating time exceeding the specified time of the disaster prevention monitoring panel using the backup power source without increasing the battery capacity of the backup power source.

In addition, even though the backlight is turned off, the LCD continues to be driven by image signals, making it possible to quickly turn on the backlight and start up the screen display if a fire is detected.

(Effect of LCD monitor brightness control)
In addition, the control unit reduces the brightness to a predetermined minimum brightness when the LCD monitor device is in a non-display state, and returns the brightness to a predetermined standard brightness when the non-display state is released.Therefore, when the LCD monitor device is operating on a backup power source due to a power outage, the power consumption of the LCD monitor device is reduced to a sufficiently low level by setting it to the minimum brightness, and even when a large LCD monitor device with a large screen size that consumes a lot of power is used, it is possible to guarantee an operating time exceeding the specified time of the disaster prevention monitoring panel using the backup power source without increasing the battery capacity of the backup power source.

In addition, even though the brightness of the display screen is reduced, the display of disaster prevention information continues, so the displayed content can be recognized from a close distance. Furthermore, if a fire is detected, the minimum brightness can be simply returned to the specified standard brightness, making it possible to quickly restore the screen display to a state where it can be clearly seen.

An explanatory diagram showing the receiver of the R-type disaster prevention monitoring equipment An explanatory diagram showing the operation section of the receiver during normal monitoring with the small door open. Block diagram showing the outline of R-type disaster prevention monitoring equipment A flow chart showing the control operation of the LCD monitor device by the receiver. A graph showing the time change in power supply voltage supplied from a backup power source during control of a liquid crystal monitor device during a power outage. An explanatory diagram showing a receiver used in a conventional fire alarm system.

[Disaster prevention monitoring panel]
(Receiver panel)
Fig. 1 is an explanatory diagram showing the appearance of a receiver installed in an R-type disaster prevention monitoring system. As shown in Fig. 1, a receiver 10 that functions as a disaster prevention monitoring panel is installed in a disaster prevention center or a manager's room of a building, and a receiver panel 11 with a door structure is arranged on the front of a box-shaped housing. The receiver panel 11 is provided with a display unit 12, a liquid crystal monitor device 14, an operation unit 16, a printer 20, and an acoustic hole 22.

The display unit 12 is provided with a fire indicator light, a gas leak indicator light, an obstruction indicator light, etc. The LCD monitor device 14 uses a large size, for example 17 inches, compared to the conventional 10 inches shown in FIG. 6, and its power consumption has increased to, for example, 40 watts, compared to the conventional 20 watts. The LCD monitor device 14 also has a touch panel, allowing touch operation of the screen.

The operation unit 16 is provided with various operation switches to be operated when a fire alarm is output, and a small door 18 that can be opened and closed downward is provided below the operation unit 16. In addition to the various operation switches, the small door 18 is provided with a status indicator light for the receiver 10, a telephone jack, etc. Also, the operation unit 16 is provided with a power failure indicator light 40 that uses a low-power consumption LED. Furthermore, the operation unit 16 is provided with an acoustic hole 22, and a speaker is arranged behind it.

(Operation section)
2 is an explanatory diagram showing the operation section of the receiver with the small door 18 open. As shown in Fig. 2, on the upper side of the operation section 16, there are provided an audio hole 22, a voice guidance switch 24 for outputting audio guidance, a fire or gas leak determination switch 25, an audio stop switch 26, a district audio pause switch 28, and a microphone 29 for telephone calls.

In addition, below the operation unit 16, which is covered by the small door 18, there are a recovery switch 30, a district sound alarm switch 32, a centralized interlocking report transfer stop switch 34, a status display unit 36, and a telephone jack 38.

Furthermore, a power outage indicator light 40 is provided above the operation unit 16, and the power outage indicator light 40 lights up when the commercial AC power supply to the receiver 10 is interrupted and switched to the built-in backup power supply.

[Disaster prevention monitoring equipment]
(Outline of disaster prevention monitoring equipment)
Fig. 3 is a block diagram showing an outline of an R-type disaster prevention monitoring system. As shown in Fig. 3, transmission lines 42-1 and 42-2 are drawn from the R-type receiver 10 toward the security area of the facility. An analog sensor 44 is connected as a terminal device to the transmission line 42-1, a repeater 46 is also connected to the transmission line 42-1, an on-off sensor 50 and a transmitter 52 are connected to a fire alarm line 48 drawn from the repeater 46, and a gas leak detector 54 is connected to another repeater 46.

In addition, multiple repeaters 46 are connected to the transmission line 42-2, and the fire shutters 56, fire doors 58, dampers 60, and alarm valves 62 of the sprinkler fire extinguishing system are connected as terminal devices via each repeater 46. Of these, the fire shutters 56, fire doors 58, and dampers 60 are control loads, and the alarm valve 62 is a detector that outputs a flowing water detection signal.

The analog sensor 44 and the repeater 46 have a transmission function for bidirectional serial transmission of information between them and the receiver 10, and are assigned unique addresses in advance, including the receiver 10. For example, if the maximum number of addresses is 256, then the number of terminals such as the analog sensor 44 and the repeater 46 that can be connected to each of the transmission paths 42-1 and 42-2 is 255 or less, excluding the receiver addresses.

(Receiver Overview)
The receiver 10 is provided with a receiver control unit 64, transmission units 66-1, 66-2, a display unit 12, a liquid crystal monitor device 14, an operation unit 16, an audio alarm unit 68, a reporting unit 70, and a printer 20. In the following description, when there is no need to distinguish between the transmission paths 42-1, 42-2 and the transmission units 66-1, 66-2, they may be referred to as the transmission path 42 and the transmission unit 66.

The receiver control unit 64 of the receiver 10 is composed of a computer circuit equipped with a CPU, memory, and various input/output ports, and performs the specified receiver control by executing a program.

Downstream signals from the receiver 10 to the analog sensor 44 and the repeater 46 are transmitted in voltage mode. This voltage mode signal is transmitted as a voltage pulse that changes the voltage of the transmission line 42 between, for example, 18 volts and 30 volts.

In contrast, the upstream signals from the analog sensor 44 and repeater 46 are transmitted in current mode. In this current mode, a signal current flows through the transmission path 42 at the timing of bit 1 of the transmission data, and the upstream signal is transmitted to the receiver as a so-called current pulse train.

Monitoring control by the receiver control unit 64 of the receiver 10 is as follows, taking fire monitoring by the analog detector 44 as an example. During normal monitoring, the receiver 10 periodically transmits a broadcast batch AD conversion message including a batch AD conversion command, and the analog detector 44 that receives this batch AD conversion message detects and retains the smoke concentration or temperature as sensor data.

The receiver control unit 64 then transmits a call message including a polling command that sequentially specifies the state of the analog sensors 44, for example the addresses of the analog sensors 44. When the analog sensor 44 receives a call message with an address that matches its own address, it transmits a response message including the sensor data it is holding at the time to the receiver 10. As a result, the receiver 10 obtains the sensor data of the analog sensor 44 upon receiving the response message, determines that a fire has occurred, and performs a fire alarm operation.

In addition, if no response message is received in response to a call message from the receiver control unit 64 when the equipment is started up, it is determined that the analog sensor 44 at that address is not connected, and if a response message that had been received until then is no longer received during normal operation, it can be determined that there is a fault in the analog sensor 44.

This type of monitoring and control by the receiver control unit 64 also applies to the repeater 46 to which the on-off sensor 50 and gas leak detector 54 are connected.

In addition, during normal monitoring, the receiver control unit 64 controls the repeater 46 to which control loads such as fire shutters 56, fire doors 58, dampers 60, etc. are connected as terminal devices by transmitting a broadcast batch AD conversion message including a batch AD conversion command at regular intervals, and the control load that receives this batch AD conversion message detects the current control status and retains it as status detection data (status data).

The receiver control unit 64 then transmits a call message including a polling command that sequentially specifies the addresses of the control loads, such as the fire shutters 56, and when the control loads, such as the fire shutters 56, receive a call message with a polling command that matches their own set address, they transmit a response message including the status detection data they are holding at that time to the receiver 10. As a result, the receiver 10 obtains the status detection data of the control loads, such as the fire shutters 56, by receiving the response message, and recognizes the current control position.

In addition, when the receiver control unit 64 determines that a fire has occurred based on the sensor data of the analog detector 44, it performs linkage control to send, for example, a shutter close command in a read message that sets the address of the repeater 46 to which the fire shutter 56 is connected, and controls the fire shutter 56 to close in the event of a fire.

The receiver 10 is also provided with a power supply unit 72 and a standby power supply unit 74. The power supply unit 72 receives a commercial AC power supply of 100V, converts it to a specified DC voltage, and supplies power to each part of the receiver, including the LCD monitor device 14, and to the detector and control load connected to the transmission line 42.

The backup power supply unit 74 has a built-in battery, and in the normal monitoring state, it receives DC voltage from the power supply unit 72 to charge the battery. If a power outage occurs in the commercial AC power supply and the power supply from the power supply unit 72 stops, the power supply is switched to the backup power supply unit 74, ensuring that the receiver 10 continues to operate for a specified period of time.

(LCD monitor device control)
When the receiver 10 is powered on and started up while being supplied with commercial AC power, the receiver control unit 64 also supplies operating power to the liquid crystal monitor device 14 and controls the display of disaster prevention information.

In addition, when the receiver control unit 64 detects a power outage in the commercial AC power supply and detects that power supply has been switched from the power supply unit 72 to the backup power supply unit 74, it turns off the operating power of the LCD monitor device 14 and switches it to a non-display state, and also controls the power outage indicator light 40 to light up.

As a result, when a power outage occurs and the receiver is operating on the standby power supply unit 74, the LCD monitor device 14 consumes zero power as the operating power supply is turned off, making it possible to provide an LCD monitor device 14 with a large screen size that consumes a lot of power. Even when an LCD monitor device 14 with a large screen size is used, the standby power supply unit 74 can guarantee an operating time of the receiver 10 that exceeds a specified time.

In addition, a large LCD monitor device 14 with a screen size of 17 inches or more can be installed, allowing disaster prevention information such as the location of a fire to be displayed in a large size, and a large amount of information can be displayed on one screen. This allows disaster prevention managers and firefighters to easily identify the location of the fire from the screen display and rush to the scene in the event of a fire, enabling them to take swift and reliable action.

In addition, there are many types of large-screen LCD monitor devices 14 available on the market as consumer products, so there are many options to choose from, and it is easy to find replacement parts when changing parts, making it possible to select and use low-cost products.

In addition, when the receiver control unit 64 receives a fire detection signal during a power outage with the operating power of the LCD monitor device 14 turned off, it controls the LCD monitor device 14 to turn on its operating power and cancel the non-display state, thereby displaying disaster prevention information indicating the location of the fire, etc.

Therefore, even if the LCD monitor device 14 is turned off and display is stopped during a power outage, if a fire occurs and a fire detection signal is received, the LCD monitor device 14 will automatically turn on and display disaster prevention information, allowing the disaster prevention manager to appropriately take action such as checking the site by looking at the disaster prevention information displayed on the LCD monitor device 14, even during a power outage.

In addition, if the power supply voltage of the standby power supply unit 74 drops below a predetermined threshold voltage Vth during a power outage, the receiver control unit 64 controls the liquid crystal monitor device 14 to turn off its operating power and switch to a non-display state.

With this control, even if the LCD monitor device 14 is operating to display disaster prevention information in the event of a fire occurring during a power outage, if the power supply voltage from the backup power supply unit 74 drops below a predetermined threshold voltage Vth due to battery depletion, the operating power of the LCD monitor device 14 will be turned off and the display will be switched off, reducing the power consumption of the backup power supply unit 74 and making it possible to extend the operating time of the receiver 10 using the backup power supply unit 74 as much as possible.

Furthermore, if the commercial AC power supply is interrupted during a fire alarm and power is supplied from the backup power supply unit 74, the receiver control unit 64 continues the display operation of the LCD monitor device 14, and then, if the power supply voltage of the backup power supply unit 74 drops below a predetermined threshold voltage Vth, controls the LCD monitor device 14 to turn off its operating power and switch to a non-display state.

Therefore, even if a power outage occurs during a fire alarm and the LCD monitor device 14 continues to display disaster prevention information by switching to the standby power supply unit 74, if the power supply voltage from the standby power supply unit 74 drops below a predetermined threshold voltage Vth due to battery depletion, the operating power of the LCD monitor device 14 is turned off and the display goes into a non-display state, reducing the power consumption of the standby power supply unit 74 and making it possible to extend the operating time of the receiver 10 using the standby power supply unit 74 as much as possible.

[Control operation of liquid crystal monitor device]
FIG. 4 is a flow chart showing the control operation of the liquid crystal monitor device by the receiver of FIG. 1, which is a control operation by the receiver control section provided in the receiver.

As shown in FIG. 4, when the receiver 10 is started up by supplying commercial AC power, the operating power of the LCD monitor device 14 is turned on in step S1, and if it is in a normal monitoring state, for example, the words "Disaster prevention monitoring in progress" are displayed on the screen of the LCD monitor device 14.

Next, if the supply of commercial AC power to the receiver 10 is stopped due to a power outage, this is detected in step S2 and the process proceeds to step S3, where the operating power of the LCD monitor device 14 is turned off to stop the display and enter a standby state, and the process proceeds to step S4, where the power outage indicator light 40 provided on the receiver panel 11 is turned on to indicate that a power outage abnormality has occurred.

Next, in step S5, it is determined whether the power has been restored. If it is determined that the power has been restored, in step S6, the power outage indicator light 40 is turned off, and the process returns to step S1, where the operating power of the LCD monitor device 14 is turned on and the words "Disaster prevention monitoring in progress" are displayed.

Meanwhile, if a fire alert is determined in step S7 by receiving a fire detection signal from the analog sensor 44 while power is being supplied from the backup power supply unit 74 due to a power outage, the process proceeds to step S8, where the operating power of the LCD monitor device 14 is turned on to display disaster prevention information such as the location of the fire on the screen, and the disaster prevention officer is prompted to confirm the location of the fire on site, etc.

Then, the power supply voltage supplied from the standby power supply unit 74 decreases over time, and when it is determined in step S9 that it has decreased below a predetermined threshold voltage Vth, the process proceeds to step S10, where control is performed to turn off the operating power supply of the liquid crystal monitor device 14 and switch it to a non-display state. This control makes it possible to extend the operating time of the receiver 10 powered by the standby power supply unit 74 as much as possible.

Figure 5 is a graph showing the time change in power supply voltage supplied from the backup power supply during control of the LCD monitor device during a power outage.

In FIG. 5, a power outage occurs in the commercial AC power supply at time t1, and power supply is switched from the power supply unit 72 to the backup power supply unit 74, after which the power supply voltage decreases over time. Note that for ease of explanation, the power supply voltage is shown to decrease linearly over time, but in reality, the voltage initially decreases at a gradual time gradient, and then decreases nonlinearly, dropping sharply when it falls below a certain voltage.

Due to the power outage at time t1, the power supply voltage, which had been constant until then, begins to decrease from point a. In this case, if the operating power supply for the liquid crystal monitor device 14 is turned on and not turned off even when the voltage falls below a predetermined threshold voltage Vth, the power consumption is added to the power consumption of the receiver 10, causing the power supply voltage to decrease, for example, with the gradient shown by line 76, and the operation of the receiver 10 to stop near point b at time t3.

In contrast, in this embodiment, when a power outage occurs at time t1, the operating power supply for the LCD monitor device 14 is controlled to be turned off, and as a result of this elimination of power consumption, the power supply voltage decreases from point a, for example at a gentle gradient as shown by line 78, and operation of the receiver 10 stops near point c at time t7, ensuring a sufficiently long operating time for the receiver 10 after the power outage.

If a fire breaks out at time t2 while power is being supplied from the backup power supply unit 74 due to a power outage, the operating power of the LCD monitor device 14 is turned on and the display of disaster prevention information begins, and the power supply voltage decreases from point d along a line 80 that has the same gradient as line 76.

If, while the power supply voltage is decreasing along this line 80, the power supply voltage falls below a predetermined threshold voltage Vth at time t4, the operating power supply for the LCD monitor device 14 is switched off. As a result, the power supply voltage decreases from point e along line 82, which has the same gradient as line 78, and operation of the receiver 10 stops near point f at time t6, making it possible to extend the operating time of the receiver 10 from time t5 to time t6, which would be the case if the operating power supply for the LCD monitor device 14 had not been turned off.

[Display control of liquid crystal monitor device by turning backlight on and off]
As another embodiment of the display control of the liquid crystal monitor device 14 provided in the receiver 10, the receiver control unit 64 may control the on/off of a backlight provided in the liquid crystal monitor device 14.

The LCD monitor device 14 has a backlight such as a fluorescent tube or LED behind the LCD panel. The LCD panel is driven by an LCD panel driver circuit, and the backlight is driven by an inverter circuit for lighting. The LCD panel is backlit by the light from the backlight to display an image.

Therefore, in this embodiment, when the receiver control unit 64 detects a power outage in the commercial AC power supply and detects that power supply has been switched from the power supply unit 72 to the backup power supply unit 74, the receiver control unit 64 stops the lighting inverter circuit provided in the LCD monitor device 14, thereby turning off the backlight and switching it to a non-display state, and also controls the power outage indicator light 40 to light up.

As a result, during a commercial AC power outage, the power consumption of the LCD monitor device 14 operated by the standby power supply unit 74 is, for example, 1 watt or less due to the backlight being turned off, and even if a large LCD monitor device 14 with a large screen size and high power consumption is used, it is possible to guarantee an operating time of the receiver 10 that exceeds a specified time using the standby power supply unit 74 without increasing the battery capacity.

In addition, if the receiver control unit 64 receives a fire detection signal during a power outage in which the operating power of the LCD monitor device 14 is turned off, it controls the LCD monitor device 14 to turn on its backlight and display disaster prevention information indicating the location of the fire, etc.

During a power outage, the backlight is turned off to keep the LCD monitor device 14 from displaying a message, but functions other than the backlight, such as driving the LCD panel with image signals, continue. If the backlight is turned on in the event of a fire in this standby state, the display instantly switches to a visible screen, which has the advantage of shortening the start-up time for the screen display compared to turning on the operating power.

Furthermore, if the power supply voltage of the standby power supply unit 74 falls below a predetermined threshold voltage Vth during a power outage, the receiver control unit 64 controls the backlight of the LCD monitor device 14 to be turned off and switched to a non-display state.

With this control, even if the backlight of the LCD monitor device 14 is turned on to display disaster prevention information in the event of a fire occurring during a power outage, if the power supply voltage from the backup power supply unit 74 drops below a predetermined threshold voltage Vth due to battery depletion, the backlight of the LCD monitor device 14 will be turned off and no information will be displayed, reducing the power consumption of the backup power supply unit 74 and making it possible to extend the operating time of the receiver 10 using the backup power supply unit 74 as much as possible. In this case, it is also possible to turn off the operating power supply of the LCD monitor device 14 instead of turning off the backlight.

[LCD Monitor Brightness Control]
As another embodiment of the display control of the liquid crystal monitor device 14 provided in the receiver 10, the receiver control unit 64 may control the brightness of the liquid crystal monitor device 14.

The liquid crystal monitor device 14 has a function to control the brightness of the screen by adjusting the amount of light emitted by the backlight, and this brightness control can be adjusted arbitrarily within a range from a predetermined minimum brightness to a maximum brightness. Specifically, the synchronous drive signal that turns on and off the lighting inverter circuit that drives the backlight at a predetermined cycle is pulse width modulated (PWM) to change the on-duty, thereby adjusting the amount of light emitted and controlling the brightness of the screen.

The minimum brightness here is a dark screen where the displayed image is visible, and is different from a black screen where the display becomes invisible.

The lower the brightness of the LCD monitor device 14, the lower the power consumption of the LCD monitor device 14. For example, in the case of a 17-inch LCD monitor device 14 that consumes 40 watts of power, the power consumption can be reduced to, for example, about 10 watts at the minimum adjustable brightness.

Therefore, in this embodiment, when the receiver control unit 64 detects a power outage in the commercial AC power supply and detects that power supply has been switched from the power supply unit 72 to the backup power supply unit 74, it changes the brightness of the LCD monitor device 14 to the minimum brightness and controls the power outage indicator light 40 to turn on.

As a result, during a commercial AC power outage, the LCD monitor device 14 operated by the backup power supply unit 74 will be in a state where power consumption is significantly reduced due to minimum brightness, and even if a large LCD monitor device 14 with a large screen size and high power consumption is used, it is possible to guarantee that the receiver 10 will operate for a period of time that exceeds a specified time due to the backup power supply unit 74.

In addition, when the receiver control unit 64 receives a fire detection signal during a power outage in which the LCD monitor device 14 is controlled to minimum brightness, it controls the LCD monitor device 14 to change its brightness to a predetermined standard brightness and display disaster prevention information indicating the location of the fire, etc.

Thus, during a power outage, the LCD monitor device 14 is set to minimum brightness, but functions other than brightness, such as driving the LCD panel with image signals, continue. If the brightness is changed to standard brightness in the event of a fire while in this standby state, the display screen instantly switches to one that is visible, which has the advantage of shortening the start-up time for the screen display compared to turning on the operating power.

Furthermore, if the power supply voltage of the standby power supply unit 74 falls below a predetermined threshold voltage Vth during a power outage, the receiver control unit 64 controls the brightness of the liquid crystal monitor device 14 to be changed to the minimum brightness and switched to a non-display state.

With this control, even if the brightness of the LCD monitor device 14 is changed to the minimum brightness to display disaster prevention information due to a fire that occurs during a power outage, if the power supply voltage from the standby power supply unit 74 drops below a predetermined threshold voltage Vth due to battery depletion, the brightness of the LCD monitor device 14 is changed to the minimum brightness to reduce the power consumption of the standby power supply unit 74, making it possible to extend the operating time of the receiver 10 using the standby power supply unit 74 as much as possible. In this case, instead of changing the brightness to the minimum brightness, the operating power supply of the LCD monitor device 14 may be turned off.

In this embodiment, the LCD monitor device 14 can be switched to minimum brightness during a power outage, making it possible to check the power outage abnormality display from a nearby position, so the power outage indicator light 40 provided on the operation unit 16 may be omitted.

[Modifications of the present invention]
(P-type disaster prevention monitoring equipment)
The above embodiment takes as an example a receiver installed in an R-type disaster prevention monitoring equipment capable of transmitting data between the receiver and an analog sensor, but the invention can also be applied to a case in which a large-screen LCD monitor device is installed in a receiver installed in a P-type disaster prevention monitoring equipment that detects and issues an alarm on a line-by-line basis to which an on-off type sensor is connected.

(Disaster prevention monitoring panel)
The above embodiment has taken as an example a receiver that monitors fires and gas leaks as a disaster prevention monitoring panel, but as long as it is equipped with an LCD monitor device, the present invention can also be applied to any appropriate disaster prevention monitoring panel, such as a smoke control panel that performs smoke control and a distributed control processing panel that is distributed to receivers in a large-scale fire alarm system.

(others)
Furthermore, the present invention includes appropriate modifications that do not impair the objects and advantages of the present invention, and is not limited to the numerical values shown in the above embodiment.

10: Receiver 11: Receiver panel 12: Display unit 14: Liquid crystal monitor device 16: Operation unit 18: Small door 20: Printer 22: Sound hole 24: Voice guidance switch 25: Assertion switch 26: Sound stop switch 28: Area sound pause switch 30: Recovery switch 40: Power outage indicator light 42-1, 42-2: Transmission line 44: Analog sensor 46: Repeater 48: Fire alarm line 50: On/off sensor 52: Transmitter 54: Gas leak detector 64: Receiver control unit 66-1, 66-2: Transmission unit 68: Sound alarm unit 70: Reporting unit

Claims (1)

A disaster prevention monitoring panel that receives an abnormality detection signal from a detector installed in a security zone, issues an alarm, and transmits a control signal to a device installed in the security zone to control the device,
A liquid crystal monitor device for displaying disaster prevention information;
A fire representative light that displays a fire representative during a fire outbreak;
A power outage indicator light that shows that a power outage is occurring;
A control unit that controls the liquid crystal monitor device, the fire indicator light, and the power outage indicator light;
Established
The control unit is
When the device is operating on commercial AC power , the liquid crystal monitor is operated.
When a power failure of the commercial AC power supply is detected and the power supply is switched to the standby power supply , the backlight of the liquid crystal monitor device is turned off and the power failure indicator light is operated .
When the abnormality detection signal is received during the power outage , the backlight of the liquid crystal monitor device is turned on ;
This disaster prevention monitoring panel is characterized in that if the power supply voltage of the standby power supply drops below a predetermined value while the backlight of the liquid crystal monitor device is turned on during the power outage, the operating power supply of the liquid crystal monitor device is turned off .

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