JPS6338936B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device including a signaling device, and more particularly to a power supply device that uses an output monitoring function, an output protection function, and a time limit monitoring function to make it possible to identify an output failure of a power supply device including a signaling device. Regarding equipment.

Conventional methods for identifying output failures include monitoring the presence or absence of output voltage and identifying it as an output failure when the output voltage disappears; however, this method detects excessive load current due to an abnormality on the load side. If the current flows, the drooping function of the power supply is activated and the output voltage drops (to a value sufficiently lower than the rated voltage), which is recognized as an output failure, so there is a drawback that an abnormality on the load side is treated as an output failure of the power supply. Ta. Furthermore, even if the output voltage falls below the rated value due to a fault inside the power supply device, there is a drawback that it cannot be identified as an output fault if some output voltage remains.

In particular, in the case of a system in which the power supplies are duplicated for each load and the output failure identification information of the operating power supply is used to switch to a normal power supply, the above method is used when the output voltage of the power supply drops due to an abnormality in the load example. Since the power supply is switched to a normal power supply, a voltage drop may occur in the power supply after switching due to the drooping function, which may again be mistaken for an output failure.

Furthermore, if the output voltage remains below the rated value due to an internal failure in the power supply, it cannot be identified as an output failure even though the load cannot operate normally, and a normal power supply may not be able to function properly. If switching is not performed, errors may occur.

Therefore, even if the system is configured such that the power supplies are duplicated and system switching is possible in the event of a power supply failure, the duplication will not be effective.

An object of the present invention is to provide a power supply with an output voltage monitoring function, an output protection function such as a fuse or a resistance lamp, and a time limit monitoring function, in order to solve the above problems, and to set the output voltage to be high due to a failure of the power supply itself. The purpose is to identify a case where the value drops below the value and the condition continues for a certain set time as an output failure of the power supply device.

In order to achieve the above object, the present invention starts time-limited monitoring when the output voltage of a power supply device drops below a certain set value, and if the output voltage continues to drop after the time limit, , which can be identified as an output failure of the power supply.

In addition, if an overload fault such as a ground fault occurs on the load side and the output voltage decreases due to the drooping function of the power supply,
A device such as a fuse or a resistance lamp is used to prevent the output voltage drop from continuing beyond the time limit of time-limited monitoring, and a drop in the output voltage of the power supply due to an overload fault on the load side is excluded from the output fault identification of the power supply. This is what I did.

The present invention will be described in detail below using examples.
The drawings show an embodiment of a signal device as a power supply device incorporating the power supply device of the present invention. In the figure, the signaling devices are duplicated for the loads, 1 and 2 are the signaling devices for the 0 system and 1 system, respectively, 3 is the switching device for the 0 system and 1 system signaling devices 1 and 2, and 4 is the load. be.
In the signal device 1, 11 is a signal generation circuit including a drooping function, 12 is an output protection circuit, 122 is a resistance lamp or fuse, etc., 13 is an output voltage monitoring circuit, 1
4 is a time limit monitoring circuit, 15 is a fault identification circuit, ONA,
TM, ON are relays, ona ⁰ , tm ¹ , on are contacts of each relay, OUT is a signal output terminal, and AL is a fault detection terminal. The channel of the switching device 3 is a switch that detects via the AL terminal when a power failure occurs in the operating signal device (in the embodiment, the 0 system connection state is shown) and switches to the signal device of another system.

Note that the detailed configuration of the signal device 2 (1 system) is the same as that of the signal device 1 (0 system), and is therefore omitted.

In a normal state, a signal from the signal generation circuit 11 is outputted to the output terminal OUT via the output protection circuit 12. Then, a signal (for example, a ring back tone in the case of a telephone device) is supplied to the load 4 through the switching device 3. On the other hand, when the output voltage monitoring circuit 13 monitors the output from the signal generation circuit 11 and maintains the rated voltage value, the relay ONA is in an operating state.
Its contact ona ⁰ is in the on (as shown) state when the relay TM
is in operation. Also, the contact tm ¹ of this relay TM,
When is on, charge is supplied to the RC circuit, and when contact tm ⁰ is on, relay ON is operating, and the contact on ⁰ remains on and the output terminal AL
Normal status (no air coming out) is displayed. Here, the RC circuit is used to charge C (capacitor) while the relay TM is operating, and to restore the relay TM with a delay when the contact ona ⁰ is turned off (opened).

Further, the monitoring voltage of the output voltage monitoring circuit 13 is set to be less than the rated value, and the time limit of the time limit monitoring circuit 14 is set to be sufficiently larger than the interval of less than the rated value of voltage fluctuation due to the operating time of the resistance lamp 122 and the signal cycle.

Therefore, in this example, consider a case in which the output voltage of the 0-system signal device 1 becomes less than the rated value while a signal is being outputted to the load 4 from the 0-system signal device 1.

Normally, when the output voltage is higher than the rated value, the output voltage monitoring circuit 13 sends a relay to the fault identification circuit 15.
When ONA is activated and the output voltage becomes less than the rated value, the output voltage monitoring circuit 13 is activated, and when relay ONA is restored, a contact is activated.
Ona ⁰ 's air is gone and the relay TM of the time monitoring circuit 14 is restored with a delay. That is, time-limited monitoring by the relay TM is started. During the delayed recovery of the relay TM, if the output voltage returns to the rated value or higher, the output voltage monitoring circuit 13 activates the relay ONA.
Therefore, the relay TM of the time limit monitoring circuit 14 returns to the operating state from the delayed recovery, and the output fault identification is interrupted. However, if the condition below the rated value continues, the relay TM will recover. When Relay TM is restored, contact will be made.
Relay of fault identification circuit 15 when tm ⁰ air disappears
ON is restored and the output failure is identified.

When an output failure is identified, the failure identification circuit 15 turns on ^0.
Earth air is output to the switching device 3 through the contact, the switching device switches from the 0-system signal device 1 to the 1-system signal device 2, and a signal is output from the 1-system signal device 2 to the load 4. state.

In addition, an overload fault such as a ground fault occurs on the load 4 side,
When an overcurrent flows, the drooping function of the signal device 11 causes
The output voltage will be below the rated value and the output protection circuit 1 will be activated.
The temperature of the second resistance lamp 122 rises due to the overcurrent, and the resistance value increases. When the temperature increases further and the resistance value of the resistance lamp becomes sufficiently large, the overcurrent decreases and the output voltage of the signal device returns to its rated value.

Therefore, a drop in the output voltage of the signaling device due to an overload failure on the load side will be a temporary phenomenon, and the output voltage of the signaling device will return to the rated value within the time limit of the time limit monitoring circuit, so it will not cause an output failure of the signaling device. .

According to one embodiment of the present invention described above, when the output voltage drops due to a failure in the signaling device itself, the point at which the load can no longer operate normally is identified as an output failure of the signaling device, and the information is used to immediately restore the normal signaling device. This has the effect of shortening the period in which the load cannot operate normally.

Although this embodiment deals with a signal device that supplies a signal as a power supply device, it goes without saying that it is also applicable to, for example, a DC power supply, and that all are included within the technical scope indicated in the claims. stomach.

As explained above, according to the present invention, the point in time when the load is no longer able to operate normally due to a drop in output voltage due to a failure in the signaling device itself is identified as an output failure in the power supply device, so it is possible to immediately take repair measures. This has the effect of shortening the period in which the load is unable to operate normally.

[Brief explanation of the drawing]

The drawing is a configuration diagram showing an embodiment of a signal device as a power supply device incorporating the fault identification function of the present invention. 1, 2; Signal device, 3; Switching device, 4; Load,
11; Signal generation circuit, 12; Output protection circuit, 1
3; Output voltage monitoring circuit, 14; Time limit monitoring circuit, 1
5; Fault identification circuit.

Claims (1)

[Claims] 1. A power supply device having a characteristic of output voltage drooping due to excessive load current, comprising: a voltage generation circuit 11; an output voltage monitoring circuit 13 that monitors the output voltage of the voltage generation circuit; time limit monitoring circuit 1 that starts time limit monitoring when the output voltage drops below a certain set value.
4, and an element 1 which melts or becomes high resistance due to overcurrent due to an abnormality on the load side in the downstream stage of the output monitoring circuit.
22, the monitoring time of the time limit monitoring circuit is set to be longer than the interval of fluctuation of the generated voltage and the operating time of the element, and if the drooping time of the output voltage continues for longer than the monitoring time, it is identified as a failure of the power supply device. Characteristic power supply.