JPS59139857A - Alarm release/restart control circuit for power source - Google Patents

Abstract

PURPOSE:To enable to release the emission of an audible alarm and to restart a power source in a simple operation by operating resetting means by the AND of an alarm signal and a restart signal, and restarting the power source in response to the resetting means. CONSTITUTION:A malfunction detector is composed of voltage comparators 17, 22, and a holding circuit for holding the output of the malfunction detector is composed of a thyristor 26 and a relay 25. A contact 27 is a switching element which closes by the operation of the holding circuit, and a relay 30 and its contacts 33, 32 form resetting means for resetting the holding circuit due to the coinciding of an audible alarm signal with a restart signal supplied externally and restarting means for restarting the power source in response to the resetting means. A restart signal is externally supplied by pressing a switch 31.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm cancellation/restart control circuit that makes it easy to cancel and restart a 111 notification signal of a power supply device that sends an alarm signal to the outside when an abnormality r in an output voltage is detected.

FIG. 1 is a schematic diagram showing an example of a conventional switching power supply. That is, input terminals a and b are connected to the DC power supply 2.
Content via i? 3 and is connected in parallel to the series connection circuit r content t3 of the primary winding of the transformer 4 and the main switch element 5.

By turning on and off the main switch element 50, 't[ flows into the primary winding of the transformer 40, and a voltage is generated in the secondary N winding of the transformer 400. The output of the transformer 4 is rectified by a diode 6.7, smoothed by a choke coil 8 and a content t9, and supplied to output terminals e and ft to an output load IO. The output voltage is determined by the error amplifier 12 and voltage comparator 1.
The zero error term spreader 12, which is compared with the reference voltages 11 and 16.21 by 7.22, respectively, outputs the output voltage and the reference voltage 1
According to the difference from 1, the conduction angle r of the conductor 13 is controlled. When the output voltage is lower than the reference voltage 11, the conduction angle is controlled to be large, and when the output voltage is higher than the reference voltage 11, the conduction angle is controlled to be small. The output of the conduction angle variable device 13 is inputted to the ground insulator 15 through the AND gate 14, and the main switch element 5 is controlled to be turned on and off by the output of the ground insulator 15. earth insulator 15
is inserted for the purpose of insulating the DC power supply 2 and the output load 10 from the earth. This prevents control from becoming inaccurate due to ground noise, etc., and uses a transformer, photocoupler, etc., for example. When the output voltage is low, the main switch element 5'f! is controlled to have a longer on time,
By controlling the on-time to be short when the output voltage is high, the output voltage can be maintained at a substantially constant value.

The voltage comparator 17 is inverted when the output voltage between the output terminals elf abnormally increases and becomes equal to or higher than the reference voltage 16 (in the illustrated connection, it is inverted from "1 level" to "02 levels"). In response to this, the Elflimp flop 18 is inverted, and its output Q is 10
Become a Rubel and close the AND gate 14 storeys. That is, the AND gate 14 closes when the output voltage rises abnormally and connects the output of the conduction angle variable device 13 to the ground insulator 15.
Input to r is cut off. As a result, the p main switch 5 is turned off, and the operation sound of the power supply device stops.

Slip flop18. Error amplifier 12. Voltage comparator 1
The operating power such as 7.22 is supplied from the converter 24 (the earth is insulated from the DC power supply 2). converter 2
4 is used, for example, as a ringing choke converter or a Royer forming converter. In addition, the converter 24
output V. is the flip-flop 180 through the resistor 192
When the zero-gon inverter 24, which is supplied to the R terminal and which is grounded through the capacitor 20, is activated by the supply of the DC power supply 2, its output ■. is delayed by the resistor 19 and the capacitor 20 and supplied to the R terminal of the flip-flop 18, thereby performing an initial reset of the flop 70 block 18.

'The heavy pressure comparator 22 performs an inverting operation when the output voltage across the output terminal elf abnormally decreases and becomes lower than the reference voltage 21, and fires the thyristor Zf1 via the earth insulator 23 and a timer r (not shown).

Since the series connection circuit of the thyristor 26 and the relay 25 is connected to the DC power supply 2, the operating contact 27 of the relay 25 operates as follows:
External alarm reception load 29 &
and the power supply 28, the operating contact 2
7 turns on, current flows through the alarm receiving load 29, and an abnormality in the power supply unit wL1 is confirmed. Even when the above-mentioned output voltage abnormally increases, if the main switch 5 is turned off and the power supply 1 stops operating, the output voltage decreases, so the voltage comparator 22 is reversed and the thyristor 26 is fired. become. That is, the contact 27 sends out an alarm signal to the outside by turning on when the power supply device is abnormal.

The above-mentioned abnormal increase or decrease in the output voltage of the power supply 1 is generally caused by a failure in the circuit components of the power supply 1 or the output load 1.
This occurs due to a short circuit of 0, etc. (5) However, even if there are no faults in the circuit components and the power supply 1 is operating normally, noise from the outside may cause a problem.
If the output voltage abnormally increases or decreases, or if the power supply
A common mode current flows between the input terminals a, b and the output terminals e, f of the 7111. The thyristor 26 may malfunction and fire. In other words, a false alarm is issued. In such a case, it is desirable to cancel the mode of transmitting the honor report in a short time and restart the power supply device r. However, in the conventional device described above, after the thyristor 26 is ignited by the output of the voltage comparator 22, the ignition state is maintained, and the contact 27 is continuously output from the power supply device 1. In order to cancel the alarm r and restart the power supply 1fi, the power supply 1r must be disconnected from the DC power supply 2 and then the DC power must be turned on again. That is, there is a drawback that the operations for canceling and restarting the newsletter are complicated.

In addition, the above operation may be incorrectly performed on the power supply unit (6) that is operating normally. There is a risk of being exposed.

It is an object of the present invention to solve the above-mentioned conventional drawbacks, to make it possible to cancel alarm sending and restart the power supply device with a simple operation, and to prevent the above-mentioned operation from being performed by mistake on a normally operating power supply device. An object of the present invention is to provide an alarm cancellation restart control circuit for a power supply device that does not affect normal operation even in the event of failure.

The control circuit of the present invention includes an abnormality detection circuit that detects an abnormality in the output voltage, and an output voltage of the abnormality detection circuit. In a power supply device that includes a holding circuit and a storage and sends out an alarm signal to the outside when the output voltage is abnormal, the holding circuit is activated when the alarm signal matches a restart signal supplied from the outside. It is characterized by a reset means for resetting, and a restart means for restarting the power supply device in conjunction with the reset means. If configured to output alarms, the alarm signal sending terminals and restart signal input terminals of multiple similar power supply circuits are connected in common, and only the power supply unit that is sending out an alarm can be restarted by operating a single restart switch. It is possible to start.

Next, the present invention will be described in detail with reference to the drawings.

FIG. 2 is a circuit diagram showing a first embodiment of the present invention.

In the figure, DC power supply 2. Condenser length 3, transformer 41
Main switch 5. Diode 6°7, choke coil 8. Capacitor 9. Output load 10, reference voltage 11, 16
,21. Error amplifier school.

Voltage comparators 17, 22. Conduction angle variable device 13. ANDGATE 14. Earth insulator 15, 23. Clip 70mp18
．． Resistance 19. Auxiliary converter 24° relay 25. Thyristor 26. Contact point 27. DC power supply 28. Alarm reception load 29
etc. and their connections are substantially similar to the conventional circuit shown in FIG.

However, in this embodiment, the relay 3 (l) is connected to one terminal of the contact 27, the other end of the relay 30 is connected to the restart signal input terminal g, and the power is supplied through the contact of the alarm release restart switch 31. 28. That is, the relay 3o connects the contact 27, the alarm release restart switch 31, and the Yc
They are connected in series and connected to a power source 28. Therefore, the relay 30 operates only when the dinner alarm release bowl starting switch 30 is pressed while the contact 27 is on and the alarm is being sent out, and is restored by pressing the switch 30. The switch 31 is, for example, a non-lock type switch. And the operating contact 33r of the relay 30@the anode of the thyristor 26,
The normally closed contact 32 of the relay 30 is connected in parallel between the cathodes.
The two auxiliary converters 24 are connected in series to the eleven source circuits. In this embodiment, the abnormality detection circuit is composed of voltage comparators 17, 22, etc., and the thyristor 26 and relay 25
Is it the output of the abnormality detection circuit? The contact 27 is a switching element that is closed by the operation of the holding circuit, and the relay 30 and its contacts 33 and 32 constitute a holding circuit that holds the
Resetting means for resetting the holding circuit r by coincidence of alarm ID No. d and a restart signal supplied from the outside, and 1FL source device 1111. in conjunction with the resetting means. r How to restart? It consists of When the switch 31 is pressed down, a start signal (9) is supplied from the outside.

Next, the operation of this embodiment will be explained. power supply ti
During normal operation, relay 25 is inactive and contact 27
is open and no alarm is sent out. Also relay 3
0 is also inactive, contact 33 is open and contact 32 is closed. Therefore, a substantially constant output voltage r is supplied to the output load 10 by the same operation as the conventional device. Even if the alarm release restart switch 31 is pressed by mistake in this state, no current will flow through the relay 30, so it will not affect normal operation.

Next, if some disturbance noise enters the power supply unit R1 and the clip 70 amplifier 18 is erroneously reversed, the AND gate 14 closes and the main switch 5 is turned off, as in the conventional example, and the output is turned off. The voltage becomes zero and the voltage comparator 22 is inverted,
The thyristor 26 fires, the relay 25 operates, and the operating contact 27 closes, thereby sending out an alarm signal. A current flows through the alarm receiving load 29 due to the cough alarm signal, and an abnormality is confirmed. In this state, the alarm signal 2 is canceled and the main tJL source (10) is installed [i11! In order to restart the system, it is sufficient to simply press the alarm release restart switch 31 for a short period of time. That is,
When the switch 31 is pressed and turned off, the power supply 28 connects the contacts 27. Relay 30. Current flows through the path of switch 31 and relay 3
0 operates and its operating contact 33 closes, thereby turning the thyristor 26 off. Also, normally closed contact 32 opens to stop supplying DC voltage to auxiliary converter 24, and voltage comparators 17, 22 . All the flip-flops 18 etc. become inoperative. Next, when the switch 31 is pressed completely, the relay 30 is restored, its operating contact 33 opens, and its normally closed contact 32 closes. At this time, since the voltage comparator 22 is inactive, the thyristor 26 maintains the cut-off state.
Therefore, when the operating contact 33 is opened, the relay 25 is restored and the contact 27 is opened. In other words, the alarm signal is released. On the other hand, by closing the normally closed contact 32, voltage is supplied from the DC power supply 2 to the auxiliary converter 24, and the auxiliary converter 24 is activated. Output V of auxiliary converter 24. Multi-fat difference amplifier 12. Voltage comparators 17, 22. flip flop 1
An operating voltage such as 8 is supplied. flip 70 tsug 18
The R terminal of is the output V. Since the voltage rises with a certain delay, the 7-lip flop 18 is reset to its initial state, and the output terminal Q
The high level output opens the SAND gate 14 and restarts the power supply. Therefore, according to the output of the error amplifier 12, the output of the conduction angle variable device 13 is passed through the antagonist 14, and the conduction angle of the main switch 5 is controlled via the earth insulation circuit 15r, so that the output voltage is kept at a substantially constant value. Become. That is,
The power supply will be restarted. During the period in which the above-mentioned switch 31 is pressed, the output V of the auxiliary converter 24 is maintained while the switch is pressed. It is sufficient that the period is at least the minimum period that allows the flip-flop 18 to be reset to its initial state when it is restarted by closing the contact 32 after the voltage has fallen sufficiently.

The above-mentioned relay 25 and its operating contacts 27. relay 30
The combination of the contacts 32, 33, etc. can also achieve the same function by using a solid semiconductor circuit such as a photocoupler.

In this embodiment, the alarm signal is canceled by a simple operation.
At the same time, there is an effect that restart control of the power supply device can be performed. Further, even if a restart signal is accidentally supplied during normal operation, normal operation will not be affected. In addition, relay contact 32.
Since the current flowing through the main input circuits 33, etc. is very small, a much smaller relay can be used compared to the case where the main input circuit is opened and closed to restart the system.

FIG. 3 is a circuit diagram showing a second embodiment of the present invention.

This case is the same as the first embodiment described above, except that the connection point between the contact 27 and the relay 30 is connected to the alarm signal sending terminal d through a diode 34 for preventing rotation. That is, the alarm signal is sent to the outside through a switching element (contact 27) that is closed by the output of the holding circuit (relay 25), passes through the loop prevention diode 34, and is sent to the outside.

Therefore, when the contact 27 is turned on, current flows through the alarm receiving load 29 as in the first embodiment. The reset means (relay 30) includes a switching element (contact 27).
and an external restart switch are connected in series with δ. Due to this series connection, the relay (13) 30 operates only when the switch 310 is turned on while an alarm is occurring, and does not operate even if the switch 31 is pressed during normal operation (contact 27 is off). Attachment [1
, 100, and 200 are connected in common to the alarm output terminal C1d and the restart signal input terminal gr, the common DC power supply 28, @' alarm reception load 29, and alarm release restart switch 31 can output the alarm signal from each device. is received,
It is also possible to supply a restart signal r to the device that has generated the alarm r. For example, yc emitted from power supply 1
A current flows through the alarm signal load 29 due to the li alarm signal.

At this time, if the switch 31 is pressed for a short time, the power supply 1
A current flows through the relay 30, the alarm from the power supply device 1 is canceled, and the power supply device 1 is restarted and returns to the normal state. At this time, the circuit connected from the contact point 27 of the power supply device 1 to the relay 130 of the power supply device @ioo via the alarm signal sending terminal di is cut off by the diode 134 for preventing looping, so the relay 130 has no power to restart. No signal applied. If another power supply generates an alarm signal,
In the case of IC (14), similarly, if the restart signal is supplied only to the power supply device that generated the υ alarm signal sound by pressing the switch 31, and the restart signal is not supplied to other normal power supply devices, , 34, 134, etc. are not inserted and the terminals d are commonly grounded. For example, if the contact 27 of the power supply device I is closed and the switch 31 is pressed while the alarm signal is being sent, the DC power supply 28. Contact 27° Relay 130 of power supply device 100. A closed loop is formed in the path of switch 31, and relay 130
is activated and the power supply device 100 performs four restart operations.The restart operation is performed by temporarily stopping and restarting the auxiliary converter built in the power supply device 1000, so the power supply device △100 is temporarily stopped. However, by inserting a loop diode, the power supply unit in the P1 normal normal section is prevented from being restarted.This will prevent the alarm sending terminals of multiple power supply units, etc. By connecting them in common and operating a single alarm release/restart switch, it is possible to control the restart of only the power supply device that is currently sending out an alarm. Therefore, in a system having multiple power supplies, if one or more power supplies sends out an alarm signal due to transient disturbance noise, the 7C1
By operating the alarm reset restart switch,
This has the effect of enabling rapid failure recovery by simultaneously canceling the alarm and restarting the system. In this case, power supplies that are not sending out alarm signals are not affected.

As described above, in the present invention, the reset means rvJ is generated by ANDing the alarm signal generated by the power supply itself and the restart signal given from the outside, and the output r of the abnormality detection (b) path is maintained by the reset means. Since the power supply device is configured to be set in the holding circuit inside and simultaneously restart the power supply device, it is possible to cancel the sending of the alarm signal of the power supply device and restart the power supply device with a simple operation. Further, even if a restart signal is accidentally input while the VI information signal is not being sent out, restarting is prevented, and a normal power supply is not interrupted. Note that if the alarm signal is configured to be sent through the diode 4 for preventing intrusion, the f-report signal sending terminal and the restart signal input terminal of a plurality of similar power supply devices can be transmitted. In this case, by operating one restart switch, only the power supply unit that is transmitting a warning signal can be restarted, and the key device can be connected to Resurrection vJ
Output due to cutting action? No interruptions 0

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing -v(1?) of a conventional power supply;
The figure is a circuit diagram showing a first embodiment of the invention, and FIG. 3 is a circuit diagram showing a second embodiment of the invention. In the figure, 1, 100, 200...power supply device,
2゜28...DC power supply, 3,9.20...Condenser length, 4...Transformer, 5...Main switch element, 6,7
... Diode, 34, 134... Diode for preventing P-contamination, 8... Choke coil, 10... Output load, l 1,16゜21... Reference voltage, 12
...Error amplifier, 13...Conduction angle variable device, 14...
・And gate, 15.23-'Earth insulator, 17.2
2...Voltage comparator, 18...Flip frog, 1
9...Resistor, 24...Auxiliary converter, 25, 3
0, 130... Relay, 26... Builis (17
) ri, 27, 32, 33, 127... contact, 29
...Alarm receiving load, 31...Alarm release restart switch, a. b...input terminal, c, d...'11 information signal sending terminal, e. f...Output terminal, g...Restart signal input terminal. Applicant Nippon Telegraph and Telephone Public Corporation agent Patent attorney Toshimune Sumita (18)

Claims (1)

[Claims] (1) An abnormality detection circuit that detects an abnormality in the output voltage,
A holding circuit for holding the output r of the abnormality detection circuit and t,
In a power supply device that sends an alarm signal to the outside when an output voltage is abnormal, the power supply device includes a reset means for resetting a holding circuit according to a match between the alarm signal and a restart signal supplied from the outside; An alarm release restart control circuit for a power supply device, characterized by comprising a restart means for restarting the warehouse. (2. In the alarm release restart control circuit for a power supply device according to claim 1, [11] The alarm signal is transmitted from the switching element closed by the output of the holding circuit to the outside through the anti-contamination diode r. and the reset means is connected in series with the switching element and an external restart switch.