JPH0426321A - Power supply receiving unit - Google Patents

Abstract

PURPOSE:To notify disconnection of feeder and occurrence of overcurrent and to interrupt overcurrent automatically by monitoring current flowing through feeder of each system, upon disconnection of feeders of a plurality of systems on common earth side, and notifying detection of no current. CONSTITUTION:Upon disconnection of a feeder 73M on common earth side, no current flows through the feeder 73M and a corresponding no current detection circuit 11M provides a detection signal(earth) to a notify circuit 13. The notify circuit 13 notifies the fact in predetermined manner. When the feeder is removed for the purpose of repair of a power supply receiving unit, detection of no current or notifying operation is invalidated through a detection prohibiting circuit 15 being set externally thus avoiding useless notification. Consequently, when feeders of a plurality of systems on a common earth side are partially disconnected, disconnection and occurrence of overcurrent are notified and the overcurrent is interrupted automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power receiving device that is supplied with power from a power supply device using a plurality of power lines.

In particular, the present invention relates to a power supply device in which the other side of a plurality of power lines connected to a load is a common ground.

[Conventional technology]

FIG. 5 is a block diagram showing an example of the configuration of a conventional power supply device.

In the figure, a power supply device 50 and a power receiving device 60 are
N systems (N is an integer of 2 or more) power supply lines 71 (71, to 7
1N) and a power supply 173 (731 to 73M) of the M system (M is an integer of 2 or more) which is connected to a common ground. Note that fuses, breakers, and other overcurrent protection circuits 51 and 61 are inserted into the power supply line 71 to which voltage is applied, respectively, on the power supply device 50 side and the power receiving device 60 side.

In the power supply device 60, the power line 71 of each system is connected to the load 63 via the overcurrent protection circuit 61, and the other side is connected to the power line 73 of the M system through a common ground.

That is, N from the power supply bag 250 to the power receiving device 60.
The entire current supplied by the power line 71 of the system is consumed by the load 63 in the power receiving device 60, is divided into the power line 73 of the M system on the common ground side, and returns to the power supply device 50. Here, the currents flowing in the N power supply lines 71 are respectively I3.
12, ..., IN, power supply m of M system with common ground
The current flowing through 73 is J+, J2,...
When J, the following relationship holds true.

FIG. 6 is a block diagram showing another example of connection between the power supply device and the power receiving device.

In the figure, a plurality of power supply devices 50 and a plurality of power receiving devices 60 are connected via power lines 71 and 73, respectively, but the configuration is such that the power line 73 on the common ground side is common to each power receiving device. be.

[Problem to be solved by the invention]

By the way, if one or more of the power lines of multiple systems on the common ground side are disconnected, the entire current of the power receiving device is divided and flows through the power lines that are not disconnected, but the relationship between the number of systems and the number of disconnections is Depending on the situation, the current flowing through the power line on the common ground side may become excessive.

In addition, in the conventional configuration, there is no way to notify when each power line on the common ground side is disconnected.Furthermore, even if overcurrent flows in other power lines due to disconnection, it is not notified and further cut off. There were no specific means to do so.

The present invention provides a power source that can automatically cut off the overcurrent when a disconnection occurs in a part of the power supply line of multiple systems on the common ground side. The purpose is to provide a receiving device.

[Means to solve the problem]

The invention according to claim 1 provides a power receiving device that receives power by connecting power lines of multiple systems to a power supply device with a common ground, and detects whether or not there is current flowing through the power lines of the multiple systems connected to the common ground. a no-current detection means that detects each system and outputs a predetermined detection signal when no current is flowing;
A notification means that makes a predetermined notification according to the detection signal output from each no-current detection means, and an external setting that enables or disables the notification operation in response to no-current detection of the power line that is a common ground. and a control means for controlling.

The invention according to claim 2 provides a power receiving device that receives power by connecting power lines of a plurality of systems to a power supply device with a common ground, in which the current flowing through the power lines of the plural systems connected to a common ground reaches a predetermined value. Detect whether the limit has been exceeded for each system,
The overcurrent detection means outputs a predetermined detection signal when the current exceeds a predetermined value, and the notification means provides a predetermined notification in response to the detection signal output from each overcurrent detection means. .

The invention according to claim 3 provides a power supply device that receives power by connecting power lines of a plurality of systems to a power supply device with a common ground, in which the current flowing through the power lines of the plurality of systems connected to a common ground reaches a predetermined value. The structure includes an overcurrent cutoff means that cuts off the current when the current exceeds the current limit.

[For production]

In the case where the power lines of multiple systems on the common ground side are disconnected,
Naturally, no current will flow through the power lines of the disconnected system, and a higher than normal current will flow through the power lines of other systems.

In the invention described in claim 1, the current flowing through the power line of each system on the common ground side is monitored, and when the no-current detecting means detects no current, the notifying means notifies the fact, so that the power line is connected to the power line. You can be notified that a disconnection has occurred.

In addition, by performing a predetermined operation on the control means that controls whether the no-current detection operation or the notification operation is enabled,
It is possible to avoid unnecessary notifications when the power line is intentionally not connected.

In the invention as claimed in claim 2, the current flowing through the power line of each system on the common input side is monitored, and when the overcurrent detection means detects an overcurrent, the notification means notifies the fact. It is possible to notify that an overcurrent has occurred due to disconnection.

In the third aspect of the invention, the current flowing through the power lines of each system on the common ground side is monitored, and the overcurrent cutoff means can immediately cut off the overcurrent caused by disconnection of other power lines.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the invention as set forth in claim 1.

In the figure, the same reference numerals are given to the power supply device and the power receiving device that are equivalent to the conventional configuration shown in FIG. 5, and the description thereof will be omitted.

The feature of this embodiment is that in the power receiving device 60', each power line 73 of the M system on the common ground side. ~73M, respectively, a no-current detection circuit 11. .about.11M is inserted, a notification circuit 13 is provided which takes the logical sum of the detection signals outputted by the respective no-current detection circuits and provides a predetermined notification in accordance with the logical sum. Furthermore, in this embodiment, each no-current detection circuit 111 serves as a control means.
-11, is provided with a detection prohibition circuit 15 which sends an operation invalidation signal to invalidate the operation. Note that if a notification circuit is provided corresponding to each power supply line and no-current detection circuit, it becomes possible to identify the disconnected power line 'rXNIA.

FIG. 2 is a block diagram showing the configuration of one embodiment of the no-current detection circuit, the notification circuit, and the detection prohibition circuit.

In the figure, the no-current detection circuit 11 is comprised of an ammeter 21, a ground air control section 22, and a relay or other ground air driving section 23. The ammeter 21 detects the current flowing through the power supply line 73, and the ground air control unit 22 determines the presence or absence of the current, and operates the ground air drive unit 23 if there is no current. Note that the detection signal sent from the no-current detection circuit 11 to the notification circuit 13 is configured to be at ground potential when no current is detected.

Furthermore, if the ammeter 21 is configured to utilize a magnetic field, it can be installed on the power line 73 without contacting it.

The notification circuit 13 includes a control section 25 and a notification section 26 such as a buzzer, a lamp, etc. The control unit 25 is configured to operate the notification unit 26 when the detection signal output from the no-current detection circuit II indicates earth. Note that the control unit 25 is configured to perform a logical OR of each detection signal of the no-current detection circuit corresponding to a plurality of power supply lines. In addition, the notification section 26
may be configured to transfer the alarm to an external alarm monitoring device.

When prohibiting the notification operation in response to the detection of no current in the power line 73, the detection prohibition circuit 15 controls the earth control section 22 of the no current detection circuit 11 according to an external setting (not shown) in this embodiment.
Give earth potential as an operation invalidation signal. The earth air control unit 22 is configured not to issue an operation instruction to the earth air drive unit 23 when the operation invalidation signal indicates earth air.

Note that the detection prohibition circuit 15 may disable the operation of the notification circuit 13 by external setting.

By the way, if there is no disconnection in the power lines 731 to 73s on the common ground side, current flows through all the power lines, so the no-current detection circuit 11 does not operate, and therefore the notification circuit 13
does not provide any notification.

On the other hand, for example, if the power line 73s on the common ground side is disconnected, the disconnected power line 73. Since current no longer flows through the corresponding no-current detection circuit 11M, the corresponding no-current detection circuit 11M sends a detection signal (earth) to that effect to the notification circuit 13. Therefore, the notification circuit 13 can perform the notification using a predetermined notification method.

For example, when the power line is removed for construction of the power receiving device, the detection prohibition circuit 15 is set from the outside.
Unnecessary notifications are avoided by disabling the detection of no current or the notification operation via the . Note that the inhibition setting of the detection inhibition circuit 15 is canceled when the power supply line is connected and power supply is started.

FIG. 3 is a block diagram showing the configuration of an embodiment of the invention according to claim 2.

In the figures, the same reference numerals are given to the same parts as in the embodiment of the invention described in claim 1 in the power supply device and the power receiving device, and the description thereof will be omitted.

The feature of this embodiment is that in the power receiving device 60'', overcurrent detection circuits 31. to 31M are inserted into each power supply line 73. to 73.4 of the M system on the common ground side, and each overcurrent detection circuit The apparatus includes a notification circuit 13 that provides a predetermined notification in response to a detection signal output by the apparatus.

Note that the overcurrent detection circuit 31 can be realized with the same configuration as the no-current detection circuit 11 shown in FIG.

However, the ground air control unit 22 is configured to drive the ground air drive unit 23 when the ammeter 21 detects an overcurrent. Further, the notification circuit I3 is equivalent to that of the first embodiment.

Common ground side power line 73. If there is no disconnection at ~7314 or if the power line is removed, overcurrent will not flow through any power line, so the overcurrent detection circuit 31 will not operate, and therefore the notification circuit 13 will not operate. No notification will be given.

On the other hand, if, for example, the power line 73M on the common ground side is disconnected and any of the currents flowing to the other power lines 73+, 73□, etc. becomes excessive, the overcurrent detection detects that overcurrent. The circuit sends a detection signal (geki) to that effect to the notification circuit 13. Therefore, the notification circuit 13 can perform the notification using a predetermined notification method.

FIG. 4 is a block diagram showing the configuration of an embodiment of the invention according to claim 3.

In the drawings, the same reference numerals are given to the same parts as in the embodiment of the invention set forth in claim 2 in the power supply device and the power receiving device, and the description thereof will be replaced by the same reference numerals.

The feature of this embodiment is that in the power receiving device 60"', overcurrent cutoff circuits 41. to 41g are inserted into each power supply line 73. to 73 of the M system on the common ground side.
The overcurrent cutoff circuit 31 can be realized by a fuse, a breaker, or other configurations that cut off the power line when a current exceeding a predetermined value flows.

Common ground side power line 73. -73, if there is no disconnection, or if the power line is removed, no overcurrent will flow through any of the power lines, so the overcurrent cutoff circuit 41 will not operate.

On the other hand, for example, the power line 73.4 on the common ground side is disconnected,
Other power lines 73. ．． When any of the currents flowing through 73□, . . . becomes excessive, the overcurrent cutoff circuit through which the overcurrent flows cuts off the power supply line. In this case, the overcurrent cutoff circuit 41.4 corresponding to the power supply line 73.4
All of them are sequentially shut down except for .

By the way, the embodiments described above can be similarly applied to a configuration in which the power line is connected to a common ground for a plurality of power supply devices as shown in FIG.

〔Effect of the invention〕

As described above, when a disconnection occurs in a part of the power supply line of multiple systems on the common ground side, the present invention notifies the occurrence of disconnection, notifies the occurrence of an associated overcurrent, and automatically shuts off the overcurrent. Therefore, the risk of heat generation and wire breakage due to overcurrent can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the invention according to claim 1. FIG. 2 is a block diagram showing the configuration of an embodiment of a no-current detection circuit, a notification circuit, and a detection prohibition circuit. FIG. 3 is a block diagram showing the configuration of an embodiment of the invention according to claim 2. FIG. 4 is a block diagram showing the configuration of an embodiment of the invention according to claim 3. FIG. 5 is a block diagram showing an example of the configuration of a conventional power supply device. FIG. 6 is a block diagram showing another example of connection between a power supply device and a power receiving device. 11... No current detection circuit, 13... Notification circuit, 15
... detection prohibition circuit, 21... ammeter, 22... ground air control section, 23... ground air drive section, 25... control section,
26... Notification unit, 31... Overcurrent detection circuit, 41 Overcurrent cutoff circuit, 50... Power supply device, 51... Overcurrent protection circuit, 60... Power supply receiving device, 61...・Overcurrent protection circuit, 63...Load, 71.73...Power line. Go to Figure He 1 Figure Figure 1

Claims (3)

[Claims] (1) In a power supply device that receives power by connecting power lines of multiple systems to a power supply device with a common ground, detecting the presence or absence of current flowing in the power lines of multiple systems that are connected to a common ground for each system, A no-current detection means that outputs a predetermined detection signal when no current is flowing, a notification means that gives a predetermined notification in response to the detection signal output from each no-current detection means, and an external setting. 1. A power receiving device comprising: control means for controlling validity/invalidity of a notification operation in response to detection of no current in a power line connected to a common ground. (2) In a power supply device that receives power by connecting power lines of multiple systems to the power supply device with a common ground, check whether the current flowing through the power lines of the multiple systems connected to the common ground exceeds a predetermined value. Overcurrent detection means that detects each system and outputs a predetermined detection signal when the current exceeds a predetermined value, and notification means that provides a predetermined notification in response to the detection signal output from each overcurrent detection means. A power supply device characterized by comprising: (3) In a power supply device that receives power by connecting power lines of multiple systems to the power supply device with a common ground, when the current flowing through the power lines of the multiple systems connected to the common ground exceeds a predetermined value, A power supply device characterized by comprising an overcurrent cutoff means for cutting off current.