JPH05219653A - Power supply control system - Google Patents

Abstract

PURPOSE:To sustain operation of sound loads by disconnecting only an abnormal load from power supply section upon occurrence of abnormality therein. CONSTITUTION:Upon occurrence of abnormality in any one of electronic machines Z1, Z2...Zn. input current to abnormal machine (Z1, Z2...Zn) exhibits an increment of deltaIi. The incremental input current deltali is fed to a power supply output monitoring circuit 15 and an abnormality detecting circuit 16 in order to detect an abnormal machine(Z1, Z2...Zn). A power supply output stop/load disconnecting control section 17 for thus detected abnormal machine (Z1, Z2...Zn) performs voltage supply interrupting control of load disconnecting circuits 13a, 13b...13n for supplying voltage to abnormal machine (Z1, Z2...Zn).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control system used when supplying power to various electronic devices.

[0002]

2. Description of the Related Art FIG. 2 shows a configuration of a conventional power supply control system.

Power from a converter or the like (not shown) is supplied to the power supply unit 2 such as an inverter, and the power supply unit 2 is supplied with the power.
Loads of various electronic devices Z1, Z2 ... Zn are connected.

Further, a power supply output monitoring circuit 5 for monitoring the output voltage of the power supply unit 2, an abnormality detection circuit 6 for monitoring the abnormality between the monitored voltage and the input voltage of the power supply unit 2, and a power supply output stop control circuit. 7 and are provided. Furthermore, the alarm unit 8
Is provided.

Next, the operation of this configuration will be described.

The output voltage from the power supply unit 2 is the electronic device Z1,
Z2 ... Zn are simultaneously supplied.

Further, the output voltage of the power supply unit 2 is monitored by the power supply output monitoring circuit 5 and the abnormality detection circuit 6, and a predetermined voltage or more,
In the following cases, the power supply output stop control circuit 7 controls the power supply unit 2 to stop the output of the output voltage supplied from the power supply unit 2 to the electronic devices Z1, Z2 ... Zn. That is, the power supply unit 2 and the electronic devices Z1, Z2 ... Zn are separated. Further, the alarm unit 8 notifies the occurrence of a failure by sound, display or the like.

[0008]

However, in the conventional power supply control system, all the electronic devices Z are supplied from the power supply unit 2.
1, because the output voltage to Z2 ... Zn is stopped,
In particular, when the electronic devices Z1, Z2 ... Zn are data communication devices or the like, there is a drawback that transmission failure occurs on a plurality of or all lines and a failure due to power interruption extends over a wide range.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a power supply control system capable of disconnecting a load of only an abnormal operation from a power supply unit and continuing the operation of another load.

[0010]

In order to achieve this object, the power supply control system of the present invention has a power supply unit for delivering a predetermined output voltage, and an output end of the power supply unit and a plurality of connected loads. Operation of a plurality of load disconnecting means connected to each other and switching supply / non-supply of a predetermined output voltage to each of the plurality of connected loads by disconnection control, and operation of each connected load connected to the plurality of load disconnecting means The individual load abnormality detecting means for detecting the current in the abnormality and the control signal for switching the predetermined output voltage to the non-supply of at least the abnormal load when the operation abnormality is detected by the individual load abnormality detecting means are disconnected from the corresponding load. And a load disconnection control means for sending to the means.

[0011]

Embodiments of the power supply control system of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the embodiment.

In FIG. 1, a power source unit 12 such as an inverter
Is supplied with electric power from a converter or the like (not shown).
The power supply unit 12 includes load disconnection circuits 13a and 13b.
... 13n is connected. This load disconnection circuit 13
a, 13b ... 13n are each equipped with various electronic devices Z1, Z
The load of 2 ... Zn is connected.

Further, a power supply output monitor circuit 15 for monitoring the output voltage from the power supply unit 12 is connected to the power supply unit 12, and the input terminal of the power supply output monitor circuit 15 and the load disconnecting circuit 13 are connected.
Output terminals of a, 13b ... 13n are connected.

Further, an abnormality detection circuit 16 for monitoring the abnormality between the monitoring voltage obtained by the power supply output monitoring circuit 15 and the input voltage of the power supply section 12, and the power supply output stop / load connected to the output terminal of the abnormality detection circuit 16. A disconnection control unit 17 is provided.

Further, an alarm unit 18 is provided for giving a notification by light, sound, vibration or voice when an abnormal operation occurs in the electronic devices Z1, Z2 ... Zn. Next, the operation of this configuration will be described.

First, the principle of control here will be described.

The output voltage Po of the power supply unit 12, the conversion efficiency η,
Given that the input voltage Vi and the input current Ii are:

[0019]

[Equation 1]

There is a relationship of

For example, the change δIi of the input current when the input voltage Vi changes has the following relationship.

[0022]

[Equation 2]

When the input voltage decreases (-δVi), the input current increases by δIi.

Therefore, as will be described in detail below, Po
= Vo × Io Io is changed to control δIi≈0.

The same applies to the case where an alarm is issued due to a blower (blower) failure during forced air cooling by a blower (blower).

When the internal loss is Pl, the output power Po is

[0027]

[Equation 3]

There is a relationship of This Pl is the permissible value under the forced air cooling condition. When the blower (blower) fails, the permissible value is Pl '.

[0029]

[Equation 4]

The output power is controlled so that

That is, Io-Io '= which will be described below.
Load of ΔIo, that is, abnormal electronic device (Z1, Z
2 ... Disconnect the Zn) load.

Next, the specific operation will be described.

When the electronic devices Z1, Z2 ... Zn are operating normally, the load disconnection circuits 13a, 13b ... 13n are controlled to be in a voltage supply state through the power supply output monitoring circuit 15 and the abnormality detection circuit 16, and the power supply unit 12 Output voltage of the electronic devices Z1, Z2 ... Zn to the load disconnection circuit 13a, 1
3b ... 13n are simultaneously supplied.

If an abnormal operation occurs in any of the electronic devices Z1, Z2 ... Zn, the abnormal electronic device (Z1, Z2 ... Z
In n), an increase of the input current δIi occurs as represented by (Equation 2). This input current δIi is the power output monitoring circuit 1
5. The electronic device (Z
1, Z2 ... Zn) are detected.

This abnormal electronic device (Z1, Z2 ... Zn)
The power supply output stop / load disconnection control unit 17 that has been notified of the detection of is detected by the load disconnection circuit (13a, 13b ... 13n) that supplies a voltage to the abnormal electronic device (Z1, Z2 ... Zn).
The disconnection control of the non-voltage supply is performed for.

For example, when an abnormal operation occurs in the electronic device Z1, the load disconnection circuit 13a is controlled to disconnect the voltage non-supply. A plurality of electronic devices (Z1, Z2 ... Z
When an abnormality occurs in n), the disconnection control of non-voltage supply to the plurality of connected load disconnection circuits (13a, 13b ... 13n) is performed.

That is, Po as expressed by (Equation 2)
= Vo × Io Io is changed to perform disconnection control of non-voltage supply so that δIi≈0.

In this case, at the same time, the alarm unit 18 is additionally used to notify the occurrence of a failure by sound, display or the like. Also, (Equation 3),
When a blower (blower) failure represented by (Equation 4) is also performed, the same non-voltage supply disconnection control is performed. That is, Io-
Load disconnection circuit (13a, 13b) for Io ′ = ΔIo
... 13n) non-voltage supply disconnection control is performed.

Here, the disconnection control of non-voltage supply when the operation abnormality occurs in the electronic devices Z1, Z2 ... Zn has been described, but when the output voltage from the power source unit 12 is an overvoltage abnormality, all the loads are disconnected at the same time. Circuits (13a, 13b ...
13n) voltage non-supply disconnection control is performed. Also, the load disconnection circuits (13a, 13b ... 13n) are selectively controlled so as to disconnect the non-voltage supply in consideration of the operating states of the electronic devices (Z1, Z2 ... Zn), and the electronic devices Z1, Z2 ...
Occurrence of failures such as Zn damage can be prevented.

Further, parallel power supply is performed from one power supply unit 12 to a plurality of electronic devices Z1, Z2 ... Zn, but the present invention is not limited to this, and when output voltages from a plurality of power supply units are supplied to a plurality of loads. Can be similarly applied to. In this case, the configuration may be the same, but the disconnection order of a plurality of electronic devices that are loads is set in advance to control disconnection without voltage supply.

Further, the input current increase due to the input voltage drop and the internal heat amount increase due to the blower (blower) stop have been described. However, the present invention is not limited to this, and the load current increase due to a short circuit in a plurality of electronic devices is similarly monitored. It is possible to control disconnection of non-voltage supply only for short-circuit load.

[0042]

As is apparent from the above description, the power supply control system of the present invention can be used when an abnormal operation is detected.
At least a control signal for switching the predetermined output voltage to non-supply to the load in which an abnormality has occurred is sent to the load disconnection means to which the load is connected to control disconnection of non-supply of voltage to the load. This has the effect of disconnecting the only load from the power supply unit and allowing the other loads to continue operating.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration in an embodiment of a power supply control system of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional power supply control system.

[Explanation of symbols]

 12 power supply section 13a, 13b ... 13n load disconnection circuit 15 power supply output monitoring circuit 16 abnormality detection circuit 17 power supply output stop / load disconnection control section 18 alarm section Z1, Z2 ... Zn electronic equipment

Claims (2)

[Claims] 1. A power supply unit for sending a predetermined output voltage, and an output terminal of the power supply unit and a plurality of connection loads, respectively, and the predetermined connection to each of the plurality of connection loads by disconnection control. A plurality of load disconnecting means for switching supply / non-supply of output voltage, an individual load abnormality detecting means connected to the plurality of load disconnecting means for detecting a current in an operation abnormality of each connected load, and the individual load abnormality When a detection abnormality is detected by the detection means, at least a load disconnection control means for sending to the corresponding load disconnection means a control signal for switching the predetermined output voltage to non-supply to the load in which the abnormality has occurred, method. 2. The load disconnection control means is provided with a notifying unit for notifying the abnormality by light, sound, vibration or voice, or a combination thereof when the operation abnormality is detected by the individual load abnormality detecting means. The power supply control method according to claim 1.