JPH09135533A - Abnormality detection of power output - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to parallelly operate two or more devices economically by installing, in a first and a second device, a first and a second diode which supply the outputs of power supply sections to abnormality detecting circuits and which form a diode combination with their cathodes being connected to each other. SOLUTION: A first and a second abnormality detecting circuit 13, 13a which output abnormality detection signals according to the abnormality in the outputs of power supply sections 11, 11a are installed in a first and a second device 10, 10a, respectively. Furthermore, diodes 14, 14a which supply the outputs of the power supply sections 11, 11a to the abnormality detecting circuits 13, 13a and which form a diode combination with their cathodes being connected to each other are installed in the first and the second device 10, 10a respectively. By this method, the parallel operation of two or more devices 10, 10a can be done very economically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a method for detecting an abnormality such as power supply output in a device of one or more units.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a power supply output abnormality detection method as shown in FIGS. 3 and 4 (for example, Japanese Patent Application Laid-Open No. 1-239472) in the case of output abnormality of a device which operates independently by one unit. ing. FIG. 3 shows a conventional power supply output abnormality detection method in which two power supplies are provided in one device, and FIG.
It is a block diagram which shows the conventional power supply output abnormality detection system provided with the main power supply part and the backup power supply part in one device.

In FIG. 3, the device 20 includes a power source unit 21,
21a outputs the power output from each diode 24, 24
It is a device that operates by being supplied to the main circuit unit 22 via a. Then, the abnormality detection circuit unit 2 for detecting the operation abnormality of the main circuit unit 22 and the output abnormality of the power supply units 21 and 21a.
3 is provided. The abnormality detection circuit section 23 and each circuit are connected via abnormality monitoring lines 25, 26, and 27.

The operation of the conventional example in FIG. 3 having the above configuration will be described. For example, when an output abnormality occurs in which the power supply unit 21 fails and its output is stopped, the abnormality detection circuit unit 23 cannot obtain the power supply output from the power supply unit 21 and instead outputs the power supply output of the power supply unit 21a. To work. Then, this output abnormality is transmitted to the abnormality detection circuit unit 23 via the abnormality monitoring line 26, and the abnormality detection circuit unit 23 that has detected the output abnormality immediately outputs the abnormality detection signal. It should be noted that the abnormality detection signal can be added with data regarding which circuit has failed. Therefore, the operator can specify that the power supply unit 21 has failed from the abnormality detection signal.

As described above, the output abnormality of the power supply unit 21 can be detected and the abnormality detection signal can be output.
With respect to the output abnormality of 1a, it is possible to detect the output abnormality and output the abnormality detection signal by the same operation. When an operation abnormality occurs in the main circuit unit 22, the abnormality detection circuit unit 23 operates by receiving power supply output from both the power supply units 21 and 21a.

Next, referring to FIG. 4, the device 30 switches only the power output of the main power supply 31 in the normal operation.
4 is a device configured to be supplied to the main circuit unit 32 via the circuit 4 to operate. Then, the operation abnormality of the main circuit unit 32,
Abnormality detection circuit unit 3 for detecting an output abnormality of the switching circuit unit 34
3 is provided. The abnormality detection circuit section 33 and each circuit are connected by abnormality monitoring lines 35 and 36, respectively.

The operation of FIG. 4 is almost the same as that of FIG. During normal times, the output of the main power supply unit 31 is supplied to the main circuit unit 32 and the abnormality detection circuit unit 33 via the switching circuit unit 34, and when an output abnormality occurs in the main power supply unit 31, the switching circuit unit 34 will change to the main power supply unit 31. Instead of this, switching is performed so as to supply the output of the standby power supply unit 31a. Then, the abnormality detection circuit section 33 outputs an abnormality detection signal.

[0008]

By the way, in the conventional example shown in FIG. 3, when one power supply fails and cannot be used, the main circuit 22 and the abnormality detection circuit 23 receive the output of the other power supply. Is configured to work. Therefore, at the time of failure, both the main circuit unit 22 and the abnormality detection circuit unit 23 must be operated by only one power supply unit, and each power supply unit has a power supply capacity more than that required for normal operation. Need to be designed.

Therefore, it is necessary to prepare two power supplies each having a large power supply capacity, which is very disadvantageous in terms of economy and downsizing of the device. In particular, when a plurality of similar devices are operated in parallel, there is a problem that the cost increases in proportion to the number of devices and the devices also become large.

Further, in the conventional example shown in FIG. 4, the switching circuit section 34 is required for switching between the main power source section 31 and the standby power source section 31a, which causes a problem that the circuit becomes complicated. In this case as well, it is disadvantageous in terms of economy and downsizing of the device as in the above case, and is remarkable when a plurality of similar devices are operated in parallel. The present invention is intended to solve such a problem, and an object thereof is to provide an abnormality detection method for a power supply output, which is excellent in economical efficiency when two or more devices are operated in parallel and can be downsized. There is.

[0011]

In order to achieve such an object, the power supply output abnormality detection method according to the present invention is provided in each of the first and second devices and responds to an output abnormality in the power supply section. And the second abnormality detection circuit section for outputting an abnormality detection signal, and the first and second devices are respectively provided in the first and second devices to supply the output of the power supply section to the abnormality detection circuit section and connect the cathodes to each other. And a first diode and a second diode formed to form a diode coupling.

With such a configuration, it is possible to output an abnormality detection signal when an output abnormality occurs in the power supply section. Further, since the power required for the operation of the abnormality detection circuit unit can be obtained from the power supply of another device, the backup power supply unit is unnecessary. That is, each device needs only one power supply unit, and as a result, it is excellent in economic efficiency, the device can be downsized, and the circuit can be simplified.

[0013]

Next, details of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, the device 10 is a device that operates by supplying the power output from the power supply unit 11 to the main circuit unit 12. In addition to this, an abnormality that detects an output abnormality of the power supply unit 11 or an operation abnormality of the main circuit unit 12 Detection circuit section 1
3, a diode 14, an abnormality monitoring line 15 for detecting an operation abnormality of the main circuit unit 12, and an abnormality monitoring line 16 for detecting an output abnormality of the power supply unit 11. The device 10a has the same configuration as that of the device 10, and the cathodes of the diodes in both devices are connected to each other via a connection line 17 to form a diode coupling.

The operation of the above configuration will be described.
For example, when the power supply unit 11 of the device 10 fails and its output is stopped, the cathode voltage of the diode 14 becomes lower than the cathode voltage of the diode 14a. Therefore, the power of the power supply unit 11a of the device 10a is also supplied to the abnormality detection circuit unit 13 of the device 10 via the diode 14a and the connection line 17. In this way, the abnormality detection circuit unit 13 can be operated even when the power supply unit 11 fails.

The output abnormality of the power supply unit 11 is transmitted to the abnormality detection circuit unit 13 via the abnormality monitoring line 16, and the abnormality detection circuit unit 13 which has detected the output abnormality immediately outputs the abnormality detection signal. This abnormality detection signal is the same as in FIG.
By adding the data of which circuit has failed,
The operator can know the failure of the power supply unit 11 from the abnormality detection signal. Similarly, an abnormality detection signal can be output for the output abnormality of the power supply unit 11a.

When the main circuit section 12 or 12a is in an abnormal operation, since the power supply section is operating normally, the abnormality detecting circuit section is operated and an abnormality detection signal is output without receiving power from another device. Can be made. Therefore, it can be known from the abnormality detection signal that the main circuit portions 12 and 12a have failed. Further, even when the number of devices is three or more, it is possible to output the abnormality detection signal at the time of power output abnormality by diode-connecting the cathodes of the diodes in the device to each other in the same manner as described above. Note that FIG. 2 is a circuit diagram of the embodiment of FIG. 1, and parts having the same reference numerals as those in FIG. 1 are the same or equivalent parts.

[0017]

As described above, according to the present invention, when two or more units are operated in parallel and an output abnormality occurs in the power supply unit of the device, power is supplied from the power supply units of other devices. As a result, the abnormality detection circuit section can be operated, and it becomes possible to detect an output abnormality and output an abnormality detection signal. Further, since it is not necessary to prepare a standby power source section, a switching circuit section, etc., the circuit configuration is simplified, and the economy is excellent.

[Brief description of the drawings]

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

FIG. 2 is a circuit diagram of the embodiment shown in FIG.

FIG. 3 is a block diagram showing a conventional power supply output abnormality detection method.

FIG. 4 is a block diagram showing another conventional power supply output abnormality detection method.

[Explanation of symbols]

10, 10a, 20, 30 ... Device, 11, 11a, 2
1, 21a ... Power supply section, 31 ... Main power supply section, 31a ... Standby power supply section, 12, 12a, 22, 32 ... Main circuit section, 13, 1
3a, 23, 33 ... Abnormality detection circuit unit, 14, 14a, 2
4, 24a ... Diodes, 15, 15a, 16, 16
a, 25, 26, 27, 35, 36 ... Abnormality monitoring line, 17
... connection line, 34 ... switching circuit section.

Claims (2)

[Claims] 1. A first device and a second device each comprising a power supply unit and a main circuit unit operated by an output of the power supply unit, the outputs being provided in the first and second devices, respectively. First and second abnormality detection circuit units that output an abnormality detection signal in accordance with an abnormality, and supply the output of the power supply unit to the abnormality detection circuit unit and cathodes provided in the first and second devices, respectively. And a first diode and a second diode which are connected to each other to form a diode coupling. 2. The abnormality detection method for power supply output according to claim 1, wherein the abnormality detection circuit section outputs an abnormality detection signal even in response to an operation abnormality in the main circuit section.