JPH09135471A - Transmission system for radio calling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress consumption of backup battery by conducting intermittent transmission control so as to send selectively radio calling data in a transmission signal format when a commercial AC power supply is failed. SOLUTION: An AC voltage from a commercial AC power supply 1 is rectified into a DC voltage B by a rectifier circuit 2 to charge a battery 4 and fed to the radio calling transmitter 5 as a DC power supply voltage Vo . A DC/DC voltage converter 6 regulates a DC voltage V2 to be a prescribed constant voltage. A transmission section 7 sends a transmission signal from a signal input terminal 8 by a prescribed system and outputs the modulated signal to an antenna 12 from a transmission output terminal 11. When the commercial AC power supply 1 is failed, an output voltage V' of the battery 4 is fed to a radio calling transmitter 5 as a DC power supply Vo . In this case, a control section 9 forms a transmission signal S with a synchronizing signal, a preamble data signal section and a calling signal section and the operation of the transmission section 7 is inhibited for pseudo data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio paging transmission system, and more particularly to a radio paging transmission system which is backed up by a secondary power supply in response to a stop of the primary power supply.

[0002]

2. Description of the Related Art A conventional radio call transmission system is equipped with an emergency power supply facility using a storage battery (battery) in case of a power failure, and uses the power stored in the storage battery of the emergency power supply facility during a power failure. The transmitter's transmissions can be backed up and continued. FIG. 2 shows a system diagram of a conventional radio paging transmission system, and FIG. 4 shows a radio paging data system and a transmitter control system.

Referring to FIG. 2, in a power supply device 10, an AC voltage supplied from a commercial AC power supply 1 which is a primary power supply is converted by a rectifier circuit 2 into a DC voltage V having a predetermined voltage, and the DC voltage V is diode 3. Is added to the storage battery 4, which is a secondary power source, to charge the storage battery 4.

When the commercial AC power supply 1 is normal, the DC voltage V is applied to the radio call transmitter 5 as the DC power supply voltage V 0, and when the commercial AC power supply 1 is stopped, the output voltage of the output of the storage battery 4 V'is applied as a DC power supply voltage VO to the radio paging transmitter 5.

In the radio paging transmitter 5, a DC power supply voltage VO is applied to the DC / DC voltage converter 6. The DC / DC voltage converter 6 is composed of a switching regulator, and converts the DC power supply voltage VO into a DC voltage VS of a predetermined voltage, while the fluctuation of the DC power supply voltage VO and the fluctuation of the load current to the transmitter 7 are prevented. Even in this case, the DC voltage VS has a stabilizing function of keeping a constant predetermined voltage.

In the transmitter 7, the transmission signal input terminal 8
From the signal format shown in FIG. 4, the transmission signal is modulated by a predetermined method to form a transmission signal S,
The signal is output from the transmission output terminal 11 to the antenna circuit 12 in the next stage. Further, the transmitter 7 is operated by receiving the DC power supply voltage VS from the DC / DC voltage converter 6 described above.

Here, the transmitting section 7 forms the transmission signal S in all parts of the signal format shown in FIG. 4, and continuously transmits as shown in FIG.
This is because the purpose of achieving stable operation of the transmitting unit is to perform continuous transmission.

However, the continuous transmission shown in FIG. 4 is continued even in an emergency due to a power failure or the like, and only the output voltage V'of the storage battery 4 of the emergency power supply facility is consumed, and the power saving function at the time of power failure is provided. Not added.

In FIG. 3, reference numeral 15 is transmitter control data, 16 is a synchronization signal (SC), 17 is preamble data, 18 is call data, and 19 is pseudo data.

[0010]

Generally, in a radio paging transmission system, in order to secure a radio transmission line, when a primary power source such as a commercial power source is stopped, a secondary power source such as a storage battery is used for radio calling. Power is supplied to the transmitter.

Since the capacity of the storage battery, which is the secondary power source, is determined by the product of the power consumption of the radio call transmitter and the expected stop time of the primary power source, the operating rate of the radio call transmission system is improved. In order to do so, a storage battery with a large capacity is required so that it can handle a longer interruption of the primary power supply.

On the other hand, the storage battery is expensive, and therefore, there is a problem that the radio call transmission system having a high operating rate as described above becomes expensive.

An object of the present invention is to provide a transmission system for radio calls which is inexpensive and has a high operating rate.

[0014]

According to the present invention, there is provided a radio paging transmission system in which backup is performed by a secondary power supply in response to the stop of the primary power supply, which responds to the stop of the primary power supply. As a result, there is obtained a radio paging transmission system characterized by comprising intermittent transmission control means for selectively sending data for radio paging.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The operation of the present invention will be described. When a commercial AC power source, which is a primary power source, is stopped, data for radio calling is selectively transmitted and other unnecessary pseudo data is not transmitted. By performing such so-called intermittent transmission control, consumption of the battery, which is the secondary power source during backup, is suppressed.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of an embodiment of a radio paging transmission system of the present invention, and FIG. 3 shows a radio paging data system and a transmitter control system. The same parts as those in FIGS. 2 and 4 are designated by the same reference numerals.

In FIG. 1, in the power supply device 10, an AC voltage supplied from a commercial AC power supply 1 which is a primary power supply is converted into a DC voltage V of a predetermined voltage by a rectifying circuit 2, and the DC voltage V is passed through a diode 3. The secondary battery is added to the secondary battery 4 to charge the secondary battery 4.

When the commercial AC power supply 1 is normal, the DC voltage V is applied as the DC power supply voltage VO to the radio calling transmitter 5, and when the commercial AC power supply 1 is stopped, the output voltage of the output of the storage battery 4 V'is applied as a DC power supply voltage VO to the radio paging transmitter 5.

In the radio paging transmitter 5, the DC power supply voltage VO is applied to the DC / DC voltage converter 6.
Further, the DC / DC voltage converter 6 is composed of a switching regulator and converts the DC power supply voltage VO into a DC voltage VS of a predetermined voltage, while the DC power supply voltage VO fluctuates and the load current to the transmitter 7 fluctuates. However, the DC voltage VS has a stabilizing function of keeping a constant predetermined voltage.

In the transmission section 7, a transmission signal having the signal format shown in FIG. 3 which is input from the transmission signal input terminal 8 via the control section 9 is added, and the transmission signal is modulated by a predetermined method to form a transmission signal S. Then, the signal is output from the transmission output terminal 11 to the antenna circuit 12 in the next stage. In addition, the transmitter 7 uses the above-mentioned D
It operates by receiving the DC power supply voltage VS from the C / DC voltage converter 6.

Here, when the commercial AC power supply 1 is normal, the transmitter 7 forms the transmission signal S in all parts of the signal format shown in FIG. 4, and continuously transmits as shown in FIG. .

Further, when the commercial AC power supply is stopped and the output voltage V'of the output of the storage battery 4 is applied to the radio call transmitter 5 as the DC power supply voltage VO, the radio call transmitter 5 is shown in FIG. The transmission signal S is formed only by the SC (synchronization signal) 16 of the signal format shown in FIG. 1, the preamble data signal section 17 and the calling data signal section 18, but the pseudo data section 19 does not perform the transmission. ,
The transmitter 7 is controlled.

The control of the transmitter 7 is performed by the controller 9. Upon receiving the stop signal of the commercial AC power supply 1 detected by the rectifier circuit 2, the control unit 9 detects the transmitter control data 15 having the signal format shown in FIG. 3, and the SC (synchronization signal) 16 and the preamble data signal unit 17 are detected. The transmitter 7 is controlled so that only the call data signal portion 18 is transmitted, and intermittent transmission is performed.

As a result, the commercial AC power supply 1 is stopped, and the output voltage V'of the output of the storage battery 4, which is the secondary power supply, is applied to the wireless call transmitter 5 as the DC power supply voltage VO. It is possible to improve the operating rate of the transmission system.

Since the transmitter control data 15 is information indicating whether the following data is the call data 18 or the pseudo data 19, the call control data 15 is detected to detect the call data 18. You can do it.

[0027]

As described above, according to the present invention,
When the primary power supply is stopped and the storage battery that is the secondary power supply transmits the radio call transmitter, by detecting the stop of the primary power supply and controlling the transmission unit to intermittently transmit the transmission signal, the storage battery time The amount of discharge per hit is reduced, and the usable time of the storage battery can be extended. Therefore, it is possible to cope with a longer stoppage of the primary power supply by using a storage battery having the same capacity as that of the conventional one, and it is possible to realize a radio call transmission system having a higher operating rate.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a block diagram of a conventional radio paging transmission system.

FIG. 3 is a diagram showing an example of a transmission data format in the transmitter during operation of the embodiment of the present invention.

FIG. 4 is a diagram showing an example of a transmission data format in a transmitter during operation of the conventional example of FIG.

[Explanation of symbols]

 1 Commercial AC Power Supply 2 Rectifier Circuit 3 Diode 4 Storage Battery 5 Transmitter 6 DC / DC Voltage Converter 7 Transmitter 9 Control Unit 10 Power Supply Device 12 Antenna Circuit

Claims (3)

[Claims] 1. A radio paging transmission system in which backup is performed by a secondary power supply in response to a stop of the primary power supply, wherein data is selectively selected for radio paging in response to the stop of the primary power supply. A transmission system for radio paging, comprising: intermittent transmission control means for sending to 2. The intermittent transmission control means, in response to the stop of the primary power source, detects a transmitter control signal mixed in the radio call data to be transmitted and controls the intermittent transmission of data for radio call. The radio call transmission system according to claim 1, wherein the radio call transmission system is configured as follows. 3. The primary power source is a commercial power source, and the secondary power source is a battery.
A wireless call transmission system as described.