JPH04197048A - Electronic device using uniterruptible power source - Google Patents

Abstract

PURPOSE:To effectively obtain a backup time by sending receiving a battery control signal to by a stabilized power source through a backup control line, and sequencing a backup start. CONSTITUTION:An input voltage is interrupted at a time T3, and power interruption is detected by a stabilized power source 12 and a power interruption detector 44 at a time T4. Then, power interruption detection signal ACFAILs 1, 2' are set to L, a battery control signal (BCTL) is opened, and a body 10 and an interruptible power source 40 becomes a backup state. When the backup is ended at a time T5, a power source control signal PSCTL becomes L by a system core 14, and a stop signal of the power source 12 is generated. Then, the BCTL is set to L, and the DC output of the body 10 is stopped after a predetermined time. The power source 40 side immediately stops the backup by the L of the BCTL, and a backup state is maintained by a second backup preventing circuit 46. The entire system is stopped at a time T6. The body 10 stops the DC output, the BCTL is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an uninterruptible power supply used in computers and the like, and particularly to synchronization of power failure backup between a plurality of power supplies.

<Prior Art> In recent years, electronic computers called personal computers and workstations have become widespread, and these are required to be free from instantaneous power outages. Therefore, the power source is an uninterruptible power supply U.
A stabilized power supply with PS or power outage backup function is used.

FIG. 7 is an explanatory diagram of a conventional device. In the figure, main body 1
0 is connected to a display 20 using a CRT (cathode ray tube) or liquid crystal. The uninterruptible power supply 40 is the main body 10
When the power is on, it receives power from a commercial AC power source, and during a power outage, it receives DC power from a battery (not shown) for backup. The stabilized power supply 12 inputs a commercial power supply AC and supplies DC power of a predetermined voltage to the main body, and has a power outage backup function using an attached battery.

FIG. 8 is an explanatory diagram of another conventional example. display 20
It also uses a stabilized power supply 22 with a power outage backup function.
The uninterruptible power supply 40 is abolished.

<Problems to be Solved by the Invention> However, since the main body 10 and the display 20 operate independently, there is a high possibility that the backup switching during a power outage will not be synchronized, especially if the display 20 switches to battery backup first. There is a problem in that when the main body 10 is switched, the battery is consumed and there is a risk that the backup time required for the entire device cannot be secured.

The present invention has solved the above-mentioned problems, and its purpose is to:
It is an object of the present invention to provide a device that can reliably secure backup time for the entire device by performing backup operations in a coordinated manner.

Means for Solving the Problems> The present invention achieves the above object by using a plurality of electronic devices that are used in combination, and a plurality of electronic devices that are provided in each electronic device that inputs external power and generates a predetermined DC voltage. DC stabilized power supply,
The device includes a battery that supplies backup power to each DC stabilized power source during a power outage of the external power source, and a backup control line that connects the DC power sources and transmits a signal (BCTL) for controlling backup. .

The backup control signal is characterized in that the backup timing of the DC stabilized power supply is set such that a specific electronic device performs a backup operation at the same time as or in advance of other electronic devices.

Functions Each component of the present invention has the following functions. The battery supplies backup power to each DC stabilized power source. The backup control line orders the timing of power failure detection in the power supply of each device, and ensures backup time for the entire system.

<Example> The present invention will be explained below using the drawings.

In FIG. 1, which is a block diagram illustrating the present invention, a system core 14 is an electronic circuit mounted on a printed circuit board or the like having central functions of the main body 10, such as a CPU and memory. Power outage detection signal CFAIL 1 is a signal output by a power outage detection circuit provided in the stabilized power supply 12, and notifies the system core 14 of the occurrence of a power outage. The power supply control signal PSCTL is a signal that the system core 14 outputs to the stabilized power supply 12, which stops the output of the stabilized power supply 12 and also stops (shuts down) the backup operation when the battery pack 2 is blown. The battery control signal BCTL is a control signal output from the stabilized power supply 12 to the uninterruptible power supply 40, and controls the backup operation of the uninterruptible power supply 40.

The power outage detection circuit 44 outputs a power outage detection signal ACFAIL2, and when the commercial power supply AC has a power outage, the power outage detection circuit 44 outputs a power outage detection signal ACFAIL2.
I am sending it to The re-backup prevention circuit 46 inputs the battery control signal BCTL to control the operating state of the power supply main body 42, and uses a type of latch circuit. Although the backup by the uninterruptible power supply 40 is temporarily stopped by the battery control signal BCTL, the main body 10 is prevented from shutting down and entering the backup state again, and the backup release state is maintained.

The backup control line 50 connects between the stabilized power supply 12 and the uninterruptible power supply 40, and carries the battery control signal BCT.
Transmit L. Note that this battery control signal BC■[ is a contact signal.

The operation of the device configured in this manner will be described next. Second
The figure is a waveform diagram explaining the operation of the device in Figure 1, where (A> is the commercial power supply AC1 (B) is the power failure detection signal ACFAIL1
, (C) is the DC output of the stabilized power supply 12, (D> is the power supply control signal PSCTL, (E) is the battery control signal BCTL, (
F) shows the power failure detection signal CFAIL2, and (G) shows the backup state.

At time T1, energization is started, and at time T2, the DC output voltage is turned on. Since the input voltage is normal, the power failure detection signal ^C
FAILI, 2 becomes H and battery control signal B
This prevents the uninterruptible power supply 40 from switching to a backup state due to a short circuit in CTL.

At time T3, the input voltage is cut off, and at time T4, the power is stabilized and a power outage is detected by the source 12 and power outage detection diagram #r44.
Then, the power failure detection signal ACFAILI, 2 becomes L, so the battery control signal BCTL becomes open, and the main unit 1
0 and the uninterruptible power supply 40 are both in a backup state. When the backup ends at time T5, the power supply control signal PSCTL from the system core 14 goes low and a stop signal for the stabilized power supply 12 is generated. Then, the battery control signal BCTL is turned on once and the DC output of the main body is stopped after a predetermined period of time.

The uninterruptible power supply 40 side immediately stops the backup in response to the L battery control signal BCTL to prevent wasteful battery consumption, and maintains the backup state by the re-backup prevention circuit 46. Then, at time T6, the entire system stops (shuts down).The main unit 10 is DC
When the output stops, the battery control signal BCTL becomes open. Note that the main unit 10 and the uninterruptible power supply 40 side receive the power failure detection signal ACFAT regardless of the state of the battery control signal BCTL.
The stopped state is maintained until LI,2 becomes H.

FIG. 3 is an explanatory diagram of a state in which the power failure detection level on the side of the uninterruptible power supply 40 is higher than that on the side of the main body 10. Time T42 is the time when the power failure detection signal ^CFAIL2 becomes L;
41 is the time when the power failure detection signal ACFAIL 1 becomes L. Depending on the power failure detection level, time T42 or time T4
The uninterruptible power supply 40 side detects a power outage at 6 time T42, which is earlier than 1, but the power outage detection signal is sent to 〇FATL.
1 is H, the battery control signal BCTL is in a short-circuit state, and switching to backup operation is prohibited. Then, at time T41, the main body 10 side and the uninterruptible power supply 40 side start a backup operation in synchronization.

FIG. 4 is an explanatory diagram of a state in which the power failure detection level of 10 main bodies is higher than the uninterruptible power supply 40fFl.In relation to the 6 power failure detection levels, time T41 is earlier than time T42. Main body 1011'l at time T41! 1 detects a power outage, the power outage detection signal ACFAIL becomes 1 or L, and switches to backup mode. Furthermore, the battery control signal BC1 is opened, allowing the uninterruptible power supply 40fFl to switch to backup operation.

On the uninterruptible power supply bag 3f40 side, even if the battery control signal 8CTL is open, the power failure detection signal CFATL2 is H, so normal operation is possible, and the entire system enters the backup state at time T42 to prevent battery consumption without switching to backup. Since the main body 10 controls the backup time, there is no problem even if the main body 10 enters the backup operation first.

FIG. 5 is a block diagram illustrating a modified embodiment of the present invention. The display 20 is provided with a stabilized power supply 22 instead of the uninterruptible power supply 40.

In this case as well, by providing the power failure detection circuit 24 and exchanging the battery control signal BCTL with the stabilized power supply 12 via the backup # control line 50, it is possible to perform operations with the same backup order.

FIG. 6 is an explanatory diagram of the present invention. Consider a system consisting of − mask stations and multiple slave stations. Each slave station will be equipped with a stabilized power supply (with power outage backup function). And backup control! By providing I50 between the mask station and the slave station and transmitting and receiving the battery control signal BCTL to and from the mask station, backup ordering can be performed.

<Effects of the Invention> As explained above, according to the present invention, the stabilized power supply 12
Since the battery control signal BCTL is sent and received via the backup control line 50 to determine the order in which the backup starts, the backup time can be ensured, and there is no unnecessary backup and battery consumption can be reduced. There is.

In addition, as in the embodiment, a re-backup prevention circuit is provided in an uninterruptible power supply or a stabilized power supply (with a power failure backup function), so that even if the main unit 10 is shut down after the battery control signal BCTI is transmitted from the main unit 10, the Reliability will further increase if backup status of electronic devices can be maintained reliably.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram explaining the present invention, FIG. 2 is a waveform diagram explaining the operation of the device in FIG. 1, FIGS. 5 and 6 are explanatory diagrams of other embodiments. FIGS. 7 and 8 are configuration diagrams of conventional devices. 10... Main body (electronic device), 20... Display (electronic device), 12... Stabilized power supply (with power outage backup function), 122... DC stabilized power supply, 14...
・System core, 40... Uninterruptible power supply, 44...
- Power outage detection circuit, 46... Re-backup prevention circuit 4
6.50...Backup system mm. BCTL...Battery control signal (backup ordering) Section 1 Figure 3 Figure 4 Figure 5 Figure 6 System interface

Claims (1)

[Scope of Claims] A plurality of electronic devices used in combination; a stabilized DC power source provided in each electronic device that inputs external power and generates a DC voltage of a predetermined voltage; A battery that supplies backup power to each DC stabilized power source; and a backup control line that connects between the DC power sources and transmits a signal (BCTL) for controlling backup, wherein the backup control signal causes the An electronic device using an uninterruptible power supply, characterized in that the backup timing of a DC stabilized power supply is set such that a specific electronic device enters a backup operation at the same time as or in advance of other electronic devices.