JPH08313563A - Power feed monitoring device - Google Patents

Abstract

PURPOSE: To provide a power feed monitoring device which outputs an alarm when a power feed to a loading device from a plug socket is stopped. CONSTITUTION: A power feed monitoring device 1 monitors whether or not a required power is fed to a load 5 connected to a plug socket 2 which is connected to commercial AC power supply through prescribed wires 3A and 3B. The device 1 is provided with a DC power source section 20 including an AC-DC converter 21 which converts AC power received through the wires 3A and 3B into DC power V and a battery 22 which is charged by the output of the converter 21, current value discriminating section 30 which is fed with the DC power V from the power source section 20 and discriminates whether or not the value of the alternating current flowing through the wires 3A and 3B is lower than a prescribed level, and alarm outputting means 40 which outputs an alarm when the AC current flowing through the wires 3A and 3B is lower than the prescribed level in response to the discrimination results of the discriminating section 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply monitoring device for monitoring whether or not power supply to various electric devices connected to an outlet is normally performed.

[0002]

2. Description of the Related Art For example, various devices adapted to take power from a commercial power source turn on a pilot lamp during power feeding in order to display to a user whether or not power is being supplied to the device. The configuration is general. Therefore, by checking the lighting state of the pilot lamp, it is possible to immediately determine whether or not power is being supplied to the device. Also, for televisions, radios, audio equipment, etc., the power supply to the outlet is stopped when the plug is pulled out from the outlet and the power supply is stopped, or the breaker is activated. If it does, no audio or video is output, so it is possible to easily know that power supply to the device has stopped without checking the lighting state of the pilot lamp.

[0003]

However, a sound or the like is not always produced during its operation, for example, a facsimile machine, various electronic devices for security, or the like. In such a case, if the plug is unplugged from the outlet for some reason, the power supply to the outlet is stopped due to the breaker being activated, or from the outlet to the device. If a disconnection or other abnormality occurs in the power line between the two, it is not possible to immediately know that the power supply to the device has stopped. For this reason, there is a risk of causing unexpectedness such as leaving various devices left for a long time in a state where important information cannot be received or transmitted.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a power supply monitoring device capable of outputting an alarm when a power supply stop state occurs in various devices which operate by receiving power from an outlet. It is in.

[0005]

The feature of the present invention for solving the above-mentioned problems is that whether or not required power is supplied to a load connected to an outlet connected to a commercial AC power supply by a predetermined wiring. An AC / DC converter for receiving AC power through the wiring and converting it into DC power in a power supply monitoring device for monitoring
A DC power supply unit for supplying a required DC power, including a battery charged by the output of the DC / DC converter;
A current value discriminating unit for discriminating whether or not the value of the alternating current flowing through the wiring is below a predetermined level because the direct current power is supplied from the DC power source unit, and the discrimination result of the current value discriminating unit is An alarm sound output unit that outputs an alarm sound in response to a level of the alternating current flowing through the wiring being equal to or lower than the predetermined level is provided.

The battery of the DC power supply unit is provided so that the DC power necessary for operating the device can be supplied at any time even when the AC power supply to the outlet is stopped due to the breaker being operated or the like. It is desirable that the battery is always charged by the output of the AC / DC converter even during the operation of this device.

The current value discriminating section connects the primary side winding of the current detecting transformer in series to one of the wirings connected to the outlet, and has a level corresponding to the value of the alternating current flowing through this wiring. Take out the voltage signal from its secondary winding,
It is possible to determine whether or not the level of the alternating current flowing through the wiring is below a predetermined level based on the magnitude of the extracted voltage signal.

The alarm sound output means may be, for example, an electric buzzer, and when the level of the alternating current flowing through the wiring becomes lower than a predetermined level in response to the current value discriminating section, a voltage is applied to the electric buzzer to thereby turn on the electric buzzer. It may be configured to sound and output an alarm sound. Further, the alarm sound output means may be configured by using a voice IC or the like, and an appropriate alarm message may be output as an alarm sound by this.

It should be noted that the power supply monitoring device can be incorporated in the outlet box, or may be integrated with the outlet to form an outlet having a power supply monitoring function. In order to monitor the power supply at another location, an electric signal indicating the determination result of the current value determination unit is taken out, and the electrical signal is sent to another location, for example, a monitoring center, by a telephone line, It may be configured to send using a dedicated line or other appropriate communication means. In this case as well, it goes without saying that an alarm sound output means may be additionally provided.

[0010]

[Function] If the plug of the device that is the load is pulled out of the outlet, the power is accidentally turned off on the load side, the power cord of the load is broken, or the wiring to the outlet is disconnected or broken, the breaker will operate When the level of the AC current flowing through the wiring becomes less than or equal to a predetermined value due to some reason, for example, the predetermined power is not supplied to the load,
This state is determined by the current value determination unit. In response to this determination result, the alarm sound output means operates to output an alarm sound.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the power supply monitoring device according to the present invention. In FIG. 1, 1 is an outlet box and 2 is an outlet box attached to the outlet box 1.
This is an outlet for supplying a commercial AC voltage of 00V indoors. The pair of terminals 2A, 2B of the outlet 2 are connected to a 100V commercial AC power source (not shown) by wiring 3A, 3B, and the plug 4 inserted into the outlet 2
Also, a commercial AC voltage of 100 V is supplied to the facsimile device 5 as a load device via the power cord 4A. The power switch 5A of the facsimile apparatus 5 is always in an ON state, and when the telephone line 6 receives an incoming call, the incoming call can be received at any time.

In the present embodiment, the power supply monitoring device 10 according to the present invention is used to monitor whether or not the required power is being supplied to the facsimile device 5 which is a load device connected to the outlet 2. It is incorporated in the outlet box 1.

In the power supply monitoring device 10, 20 is a DC power supply unit, 30 is a current value discriminating unit, and 40 is a buzzer for outputting an alarm sound. The DC power supply unit 20 receives AC power from wirings 3A and 3B for supplying commercial AC voltage to the outlet 2 and outputs AC / DC for extracting a predetermined DC voltage V.
It comprises a converter 21 and a battery 22 that is charged by the DC voltage V from the AC / DC converter 21. The DC voltage V is applied to the battery 22 and is also supplied to the current value determination unit 30.

The current value discriminating section 30 is connected to the wiring 3A, which is one wiring for supplying an AC voltage to the outlet 2, as shown in the drawing, and the level of the AC current flowing through the wiring 3A becomes a predetermined value or less. It is configured to determine whether or not there is.

A buzzer 40, which is attached to the outlet box 1 by screwing or other appropriate means, is connected to the current value determination section 30. When the current value discriminating unit 30 discriminates that the value of the alternating current flowing through the wiring 3A is below a predetermined level, the current value discriminating unit 30 supplies the driving current to the buzzer 40, and the buzzer 40 rings. It is configured to do.

In the embodiment shown in FIG. 1, the predetermined level set in the current value discriminating unit 30 is based on the value of the alternating current flowing through the wiring 3A when the power switch 5A of the facsimile 5 is turned on and the standby state is established. Is also set to a small value. Therefore, the buzzer 40 does not ring when the facsimile 5 is operating in the standby state or when there is an incoming call and a larger load current is flowing through the wirings 3A and 3B. However, when the power switch 5 is turned off, the plug 4 is pulled out from the outlet 2, the power cord 4A is broken, or the like, the wiring 3A, 3
The value of the alternating current flowing through B falls below a predetermined level and the buzzer 40 sounds. As a result, it is possible to inform the people around that the power supply to the facsimile 5 has stopped.

Further, the breaker is activated or the wiring 3
When a so-called power failure occurs due to disconnection of A and 3B, the required DC power is supplied from the battery 22 to the current value discriminating unit 30.
It is possible to determine that the current 0 flowing in the wiring 3A has become equal to or lower than a predetermined level and cause the buzzer 40 to ring.

As described above, since the power supply monitoring device 10 can detect all kinds of power supply stoppages and output an alarm sound, various devices (e.g., facsimiles, refrigerators, etc.) that must be operated for 24 hours in particular. ,freezer,
(Various devices for security, etc.), it is possible to monitor power supply to them very effectively. Of course, the power supply monitoring device 10 can be used for power supply monitoring of other various devices.

In the embodiment shown in FIG. 1, no switch for stopping the operation of the power supply monitoring device 10 is provided. For this reason, an alarm sound is output even when the load is not connected to the outlet 2, so that, for example, a switch is provided between the buzzer 40 and the current value discriminating unit 30 and only when the power supply monitoring is necessary. The buzzer 40 may be configured to be connected to the current value determination unit 30 by closing the switch. In this case, the switch may be prevented from being manipulated from the outside of the outlet box 1 to prevent mischief, or the switch may be provided in an appropriate form so that it can be freely operated from the outside of the outlet box 1 in consideration of convenience. May be.

FIG. 2 shows the power supply monitoring device 10 shown in FIG.
A more specific circuit diagram of is shown. 2, parts corresponding to the respective parts in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

The AC / DC converter 21 includes wiring 3A,
A rectifier circuit 23 for double-wave rectifying the 100V AC current taken in from 3B, a capacitor 24, a resistor 25, and a constant voltage diode 26 which form a smoothing circuit for smoothing the output from the rectifier circuit 23 are illustrated. This is a well-known circuit configuration that is connected as described above. Here, the parallel circuit of the resistor 27 and the capacitor 28 is a noise elimination circuit and may be omitted.

In this way, the AC / DC converter 2
1 outputs a required DC voltage V determined by the characteristics of the constant voltage diode 26, and the DC voltage V constantly charges the battery 22 and is supplied to the current value determination unit 30.

The current value discriminating unit 30 includes a transformer 31 for current detection in order to take out an AC voltage signal having a level corresponding to the value of the AC current flowing through the wiring 3A. The primary winding 31A of the transformer 31 is connected in series to the wiring 3A, and the alternating current flowing through the wiring 3A flows through the primary difference line 31A as it is and flows from the secondary winding 31B of the transformer 31 into the wiring 3A. An AC voltage U having a level corresponding to the level of the AC current is taken out. This AC voltage U is the capacitor 3
2 and the resistor 33, and is applied to the-side input of the voltage comparison circuit 34. A first reference voltage E1 formed by dividing the DC voltage V by resistors 35 and 36 is applied to the + side input of the voltage comparison circuit 34.

Therefore, the voltage comparison circuit 34 obtains the pulse voltage signal P which becomes high level only when the level of the AC voltage U becomes lower than the first reference voltage E1.

This pulse voltage signal P is integrated by an integrating circuit composed of a resistor 37 and a capacitor 38, and finally, the + input terminal of the voltage comparator 39 has an integrated voltage of a level corresponding to the value of the alternating current flowing through the wiring 3A. Is applied.
On the other hand, the negative input terminals of the voltage comparator 39 have resistors 41, 4
The second reference voltage E2 obtained by dividing the DC voltage V by the voltage dividing circuit including the variable resistor 2 and the variable resistor 43 is applied.

Therefore, when the level of the integrated voltage applied to the + input terminal of the voltage comparator 39 is higher than the level of the second reference voltage E2, the output level becomes substantially equal to the DC voltage V, and the voltage comparison When the level of the integrated voltage applied to the + input terminal of the device 39 becomes equal to or lower than the level of the second reference voltage E2, its output level becomes substantially equal to the ground level.

The buzzer 40 is connected between the output of the voltage comparator 39 and the + output of the DC power supply unit 20 in order to drive the buzzer 40 according to the above-mentioned level determination result of the voltage comparator 39. As a result, when the level of the integrated voltage applied to the + input terminal of the voltage comparator 39 becomes lower than the level of the second reference voltage E2, that is, the level of the alternating current flowing through the wiring 3A becomes lower than the predetermined value. Buzzer 4
0 will sound.

In the circuit example shown in FIG. 2, a series circuit of a resistor 44 and a light emitting diode 45 is connected in parallel with the buzzer 40, and the light emitting diode 45 also emits light when the buzzer 40 operates. ing. Therefore, the result of power supply monitoring can be visually displayed. In this case, in order that the lighting state of the light emitting diode 45 can be confirmed from the outside of the outlet box 1, the light emitting diode 45 is attached to an appropriate location outside the outlet box 1.

In this embodiment, an example in which the power feeding monitoring device 10 is incorporated in the outlet box 1 has been described, but the power feeding monitoring device according to the present invention is not limited to the configuration of this one embodiment. For example, it can be incorporated into the outlet 2 to make it easier to handle, or it can be incorporated into another case to be attached to the outside of the outlet box 1 as appropriate. Of course, it may be applied to the above.

Further, in this embodiment, an example in which the buzzer sound is adopted as the alarm sound has been described, but a voice IC is adopted instead of the buzzer 40, and a voice message such as "power is not supplied" is issued as a warning. It may be configured to emit as a sound. When this configuration is adopted, anyone can immediately understand the alarm content, and even a person who happens to be around can take appropriate measures against it.

In the above-described embodiment, the configuration in which the result of power supply monitoring is output as an alarm sound by an alarm sound output means provided near the outlet, for example, a buzzer has been described. However, in the case of power supply monitoring of the security device, it may be necessary to notify the monitoring result to another place. Therefore, for example, instead of or in addition to the buzzer 40, a relay may be provided and ON / OFF information of the contact may be taken out. That is, the drive coil of the relay is connected in parallel with the buzzer 40, for example, and at the same time when the buzzer 40 operates, a current is also applied to the drive coil of the relay, thereby actuating the relay contact and turning on / off the relay contact. Can be taken out as an electric signal. In this case, it goes without saying that any one of a make contact, a break contact and a transfer contact may be used as the relay contact. In this case, the buzzer 40 may be omitted and only the relay may be provided.

If the signal for monitoring is obtained from the contact of the relay in this way, in the mechanical security system, for example, in order to monitor the supply state of the power supply of the device which requires 24-hour power supply. When using this power supply monitoring device, send the monitoring signal of this power supply monitoring device to the monitoring sensor using a public telephone line, a dedicated telephone line, or other appropriate communication line in the same way as the sensor alert signal. This helps to significantly improve the reliability of the system.

[0034]

According to the present invention, as described above, the power supply section is provided with the battery which receives power from the power supply line supplied to the load device, converts the power into a required DC voltage, and charges the DC voltage. , Not only when the power supply to the load device is stopped due to the cause of the load device connected to the outlet, but also when the power supply is stopped due to the cause of the AC power supply, such as the breaker operation. An alarm sound such as a buzzer sound or a predetermined message can be output. For this reason, it is possible to prevent unintentionally and unexpectedly the power from being turned off without knowing it, and it is possible to reliably monitor the power supply state to various load devices.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a detailed circuit diagram of the power supply monitoring device shown in FIG.

[Explanation of Codes] 2 Outlets 3A, 3B Wiring 5 Facsimile device 10 Power supply monitoring device 20 DC power supply unit 21 AC / DC converter 22 Battery 30 Current value determination unit 40 Buzzer

Claims (1)

[Claims] 1. A power supply monitoring device for monitoring whether or not required power is being supplied to a load connected to an outlet connected to a commercial AC power supply by a predetermined wiring, and an AC power supply is provided via the wiring. A DC power supply unit for supplying a required DC power, comprising an AC / DC converter for receiving power and converting it into DC power, and a battery charged by the output of the AC / DC converter; A current value discriminating unit for discriminating whether or not the value of the alternating current flowing through the wiring is supplied with DC power and is below a predetermined level; and the wiring in response to the discrimination result of the current value discriminating unit. An alarm sound output means for outputting an alarm sound when the level of flowing alternating current is equal to or lower than the predetermined level.