JPS58201547A - Ac power source switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an AC power switching device that supplies power to parts commonly used by both systems in a composite computer system in which each computer system has an independent power supply. Regarding.

[Technical background of the invention]

The number of electronic computer systems is increasing year by year, and the increase in complex systems is particularly remarkable. In complex systems,
Some input/output devices (or modules) tend to be used in common by each CPU system, and are called common modules. Further, it is common to supply each CPU system with an independent MCU power supply, and the AC power supply of the common module is connected to which CPU system AC power supply.

[Problems with background technology]

When the computer system is operating in the above state, if the CPU system that supplies AC power to the common module stops operating due to a power outage, it is necessary to switch to another system and start the system. Since the system is also stopped, it cannot be accessed from other systems, and the computer system has the disadvantage that it cannot be operated in a satisfactory state. Such a problem is a significant disadvantage for complex computer systems.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an AC power switching device that eliminates the above drawbacks and is effective in supplying power to a common module of a complex computer.

Summary of the invention] In the present invention, a plurality of independent AC power sources are input,
perform independent power outage or low-level monitoring of them;
If one or more AC power supply abnormalities are detected,
The KAC power supply is automatically switched so that the remaining normal AC power can be output.

[Embodiments of the invention]

FIG. 1 is a block diagram of a complex computer system operated by two people. In the figure, (lot) is a complex computer system, (102) is a #1 CPU system, and (10
3) It is a 2 CPU system. (104) is a common module part (Dvt, DV, -
Medium-DVn), (H)s)dAc power supply switching device (AC
-8W). (2), (2) is for each CPU system (102
), (103) of independent systems
This is the power line. (2) is the ACC power switching device 10
5) [Output cam C line connected to either KII C power supply line (E) or (B) [Common module (10)
4)], (23M), (23b) are the respective C
Path lines of PU systems (102) and (103) FIG. 2 is a block diagram showing one embodiment of the present invention (a detailed example of the AC power switching device (105) shown in No. 11gK). In Figure 2, (1) is a switch circuit that switches multiple AC inputs, (2m), (zb) are each AC power line..., @
No-use breaker (NFB, , NFB
, ). (3B>, (3b) is a *m circuit for creating a DC power supply for this device from each AC power supply, (4a), (
4b) is an abnormality detection circuit that detects a power outage or low level of the muC power supply from the rectifier circuits (3a) and (3b).

(5) is a logic circuit that performs internal control, (6a), (6b
) are rectifier circuits (3a), respectively.

A regulator circuit that stabilizes the DC power supply by connecting the output of (3b) (logical sum operation) (7) Diode for backflow prevention when connecting K, @ is a no fuse breaker (2 鳳), The output of (2b) is the same as (2). (25 Maro) and (2Sb) are rectifier circuits (31).

The output of (3b) serves as an input to the abnormality detection circuits (4a) and (4b), and also serves as an input to the regulator circuit (1) via the diodes (6a) and (6b).

(261) and (26b) are nose 7 needle breaker (
2m).

(2b) external trip signal, plow is switch circuit (1)
This is a signal line that commands the switching of the switch.

(28m) and (28b) are the monitoring outputs (abnormal signals) from the abnormality detection circuits (4a) and (4b) that detect abnormalities in each AC power supply, the line is the regulator output line, and (to) is the regulator circuit (7) is the input power line [output of diode (6 heat) t (6b)].

Next, the operations shown in FIGS. 1 and 2 will be explained with reference to FIG. 3, which is an operation timing chart of the AC power switching device of the present invention. The device DV in FIG.

DVs...”・Dvn HA#I CPU system (1
02) and #2 CPU system (103). Output AC line (2
), priority is determined by the AC power switching device (106) so that power is normally supplied from the AC power line. Therefore, when the compound computer system (101) is in operation, the AC power switching device (10
5) switches the power from the MuC power supply input 4 to the output AC line @(instead of the AC power supply line (E). Therefore, the common module (104) will not experience a power outage and the device Dv11Dvtomi...D
There is no problem in accessing vrA from the #2 CPU system (103).

Next, the operation shown in FIG. 2 will be explained. AC power switching device (1
05) [FiDC power supply and logic circuit for abnormality detection and internal control are built-in. When power is supplied through the AC power lines ■ and @, independent rectifier circuits (including step-down transformers) (3a), (3
b) outputs the rectified voltage to the line (258>, (25b)K).These outputs are OR-connected via the diode (6m) and (6b) and output to the line (to).

Therefore, the regulator circuit (7) operates and a predetermined output (usually 5 VDC) is generated on line 4, and the logic circuit (5) operates. The above is normal operation, and the AC power line (
(e) is connected to the output AC line (2). FIG. 3 shows waveforms at each point with the same numbers as above.

Next, the operation in an abnormal state will be explained. If the power supply from the ACvl source line Ukara fails for some reason at the arrow point in Figure 3, the output of the rectifier circuit (3m) will disappear and the abnormality detection circuit (
4a) outputs an abnormality detection signal to line (28a).

The logic circuit (5) which inputs this output is a rectifier circuit (3b
), operates upon receiving power supply through the regulator circuit (7), and outputs a switching command signal for the switch circuit (1). At this time, the trip output signal (26
a) is a no-use breaker (2a) at the same time as the signal is generated.
However, the switching control signal - is output with a delay of one hour from output (2) as shown in FIG. Upon receiving the switching control signal (2), the switch circuit (1) switches the contact to the AC power line (2) and outputs it to the output AC line (2). When the AC power line (2) returns to normal and the No. 7 use breaker (11) is turned on, the original connection is restored.

As per 5 above, disconnect the power supply with force (2 m) and then change the switch in consideration of low-level abnormalities.
is not a necessary operation.

〔Effect of the invention〕

The present invention is as described above, and in a complex system having a plurality of input power sources, detects an abnormal state of the power input and automatically converts the abnormal power supplied to the common part into a normal power source. If there is one normal power supply that can be switched, a state in which operation is possible can be realized. In addition, increasing the muC input is a problem, and the system design is a problem. Further, there is an effect that the state can be monitored externally using the alarm signal of the switching state.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a complex computer system to which the present invention is applied, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a diagram of operation waveforms and operation timing at each point in FIG. 1. It is. 1... Selector switch 3m, 3b... Rectifier circuit 4m, 4b... Abnormality detection circuit 5... Logic circuit 7
... Regulator circuit 20.21 ... Mu C power supply Uini 27 ... Switching command signal agent Patent attorney Inoue - Male

Claims (1)

[Claims] In an AC power switching device for a complex computer system, multiple AC power supplies from different systems are connected to each input terminal, one of them is normally connected to the output terminal, and a changeover switch is used to switch to the other one on command. Then, the logical sum output of each of the outputs obtained by stepping down and rectifying each of the AC power sources is regulated and used as a power source, and a signal indicating an abnormality of the input CIIE source detected by the output state II of each of the rectifying circuits is inputted. An AC power supply switching device comprising: a logic circuit that outputs the command signal for switching the changeover switch to a normal AC power supply.