JPH0548011U - Power supply abnormality detection device - Google Patents

Abstract

(57) [Abstract] [Purpose] Circuit of a power supply abnormality detection device that delays input power supply to an alarm device until the power supply circuit starts operating at primary power supply input due to variations in the operation start delay time of various power supply circuits The intent is that changes are no longer required for each device. [Structure] Power supply circuits 4, 5, 6 having a normally closed contact a for transmitting a power supply abnormality and a normally open contact b for transmitting the start of power supply circuit operation
And an alarm device 7 for notifying that an abnormality has occurred in the power supply circuit in the device using the primary power supply inputs 1 and 2,
The primary power supply to the alarm device 7 is delayed by closing the normally open contact b after the normally closed contact a is activated when the primary power is input.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power supply abnormality detection device for detecting an abnormality of a power supply circuit and an abnormality alarm in a device using a power supply circuit that internally receives a supply of a primary power supply and generates a secondary power supply.

[0002]

[Prior Art]

 FIG. 5 is a block diagram of a conventional power supply abnormality detection device. In the figure, 1 is a primary power supply input, 2 is a primary power supply input return, 3 is a switch element for turning on and off the primary power supply input, 4, 5 and 6 are power supply circuits for inputting a primary power supply and generating a secondary power supply, a is a Power supply circuits 4, 5 and 6 are closed when power supply circuits 4, 5 and 6 are not in operation and when primary power is supplied. Power supply error signal generating normally closed contact, 7 is supplied with primary power. Sometimes an alarm device is activated by closing the normally closed contact a, 8 is a resistor forming an integrating circuit, 9 is a capacitor forming an integrating circuit with the resistor 8, and 10 is a primary power source input to the alarm device.

When the primary power source input 1 and the primary power source input return 2 are connected by closing the switch element 3 now, the primary power source is supplied to the power source circuits 4, 5, 6 and the power source circuits 4, 5, 6 operate. If it is normal, the normally closed contact a is opened. Also, when an abnormality occurs in the power supply circuits 4, 5 and 6, the normally closed contact a of the abnormal power supply circuit is closed and the alarm device 7 is activated to warn that a power supply abnormality has occurred. The primary power source supply line 10 is provided with a resistor 8 and a capacitor 9. The integrating circuit delays the supply of the primary input power source 10 to the alarm device 7 until the power source circuits 4, 5, 6 start operating. In this way, by setting the alarm device 7 in the ready-to-start state after the start of the power supply circuit operation, it is possible to prevent an erroneous power supply abnormality alarm due to a delay in the start-up time of the power supply circuits 4, 5, and 6 when one power supply is supplied. ing.

[0004]

In the conventional power supply abnormality detection device as described above, the operation start delay time of one or a plurality of power supply circuits used in the device is known in advance, and the integration circuit is calculated with respect to the maximum time. Although a constant is set, the start delay time differs depending on the type of power supply circuit used for each device, and there are variations in the start delay time even for power supply circuits of the same type. There was a difficulty in setting the integration circuit constants (resistance value, capacitor capacity) for each device and changing the circuit of the circuit that delays the input power supply to the alarm device.

According to this invention, it is necessary for each device to change the circuit of the circuit that delays the input power supply to the alarm device until the power supply circuit starts operating at the time of primary power supply input due to the variation in the operation start delay time of various power supply circuits. The purpose is to disappear.

[0006]

[Means for Solving the Problems]

 The power supply abnormality detection device according to the present invention supplies a normally open contact that is closed in the power supply circuit when the power supply circuit starts to operate and a normally open contact of a relay that is driven by closing the normally open contact to the primary power supply of the alarm device. It is provided on the line.

A power supply abnormality detecting device according to a second embodiment of the present invention includes a normally-closed contact which is closed in a power supply circuit due to an abnormality in the power supply circuit and notifies the alarm device of the power supply abnormality, and A normally open contact is provided between the closed contact and the alarm, which is closed when the power supply circuit starts operating.

[0008]

[Action]

 In this invention, after the power supply circuits used in the equipment are activated, all the normally open contacts that are closed when the power supply circuits in each power supply circuit are activated are closed, so that the primary power supply line to the alarm device Since the normally open contact of the provided relay is closed and the primary power is supplied to the alarm device, the alarm device can be activated after the power circuit starts operating.

In addition, in the second embodiment of the present invention, after the power supply circuits used in the equipment are activated, the normally open contacts that are closed by the activation of the power supply circuits in each power supply circuit are closed. As a result, the open / closed state of the normally open contact that is closed due to the power supply abnormality is transmitted to the alarm device, so that the alarm device can detect the power supply abnormality of each power supply circuit after the start of operation of each power supply circuit.

[0010]

【Example】

 Example 1. FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a timing chart showing the operation of this embodiment. In the figure, 1 to 7 and a are the same as or equivalent to the above-mentioned conventional device. b is a normally open contact that is closed when the power supply circuits 4, 5 and 6 start operating, 11 is a relay that is driven when the normally open contact b is closed, and c is a normally open contact of the relay 11. A primary power input is connected, and the primary power input end of the alarm device 7 is connected to the other end.

In the power supply abnormality detecting device configured as described above, when the switch element 3 is closed when the primary power supply inputs 1 and 2 are connected to the power supply abnormality detecting device, the power supply circuits 4, 5, 6 are connected. When the primary power source is supplied to the power source circuits, the power source circuits 4, 5 and 6 generate the secondary power source, and also self-diagnose whether or not there is any abnormality in the power source circuit. If they are normal, each closed contact a is opened. When there is an abnormality, each normally closed contact a remains closed. When the state of each normally-closed contact a is determined by the self-diagnosis result of the power supply circuits 4, 5, and 6, the power supply starts to operate and each normally-open contact b is closed, and when all the normally-open contacts b are closed, the relay 8 is driven. To be done. As a result, the normally-open contact c of the relay 11 is closed and the primary power inputs 1 and 2 are supplied to the alarm device 7, and the alarm device 7 becomes operable.

Example 2. FIG. 3 is a block diagram showing the second embodiment of the present invention, and FIG. 4 is a timing chart showing the operation of this embodiment. In the figure, 1 to 7 and a are the same as or equivalent to the above-mentioned conventional device. Reference numeral b is a normally open contact that is closed when the power supply circuits 4, 5 and 6 start operating.

In the power supply abnormality detecting device configured as described above, when the switch element 3 is closed when the primary power supply inputs 1 and 2 are connected to the power supply abnormality detecting device, the power supply circuits 4, 5, 6 are connected. Primary power is supplied to the power supply circuits, and the power supply circuits 4, 5 and 6 generate a secondary power supply, and also self-diagnose whether there is any abnormality in the power supply circuits. If they are normal, the normally closed contacts a are opened. When there is an abnormality, each normally closed contact a remains closed. When the state of each normally-closed contact a is determined by the self-diagnosis result of the power supply circuits 4, 5, and 6, the power supply operation is started, and each normally-open contact b is closed. As a result, the open / closed state of the normally closed contact a is transmitted to the alarm device 7, and the alarm device 7 detects the power supply abnormality of the power supply circuits 4, 5, 6 after the operation of the power supply circuits 4, 5, 6 is started. It becomes possible to do.

[0014]

[Effect of the device]

 As described above, this device can activate the alarm after all the power supply circuits in the equipment have started to operate, so that due to variations in the start-up delay time of various power supply circuits used, It is not necessary to change the circuit of the circuit that delays the input power supply to the alarm until the power supply circuit of the device starts operating.

Further, in the second embodiment of the present invention, the alarm device can detect a power supply abnormality after each power supply circuit in the device is activated, so that the operation of various power supply circuits to be used can be performed. Due to the variation in the start delay time, it is not necessary to change the circuit of each circuit that delays the input power supply to the alarm device until all the power supply circuits start operating.

[Brief description of drawings]

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

FIG. 2 is a timing chart showing the operation of an embodiment of the present invention.

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

FIG. 4 is a timing chart showing the operation of the second embodiment.

FIG. 5 is a configuration diagram showing a conventional device.

[Explanation of symbols]

 1 primary power input 2 primary power input return 3 switch element 4 power circuit 5 power circuit 6 power circuit 7 alarm 8 resistance 9 capacitor 10 primary power input to alarm 11 relay a normally closed contact b normally open contact c normally open contact

Claims (2)

[Scope of utility model registration request] 1. A power supply circuit which receives a primary power supply from the outside and internally generates a secondary power supply, and when an abnormality occurs in this power supply circuit, an abnormality signal from the power supply circuit is sent using the primary power supply. In a power supply abnormality detection device configured with an alarm device that reports that a power supply abnormality has occurred, in order to prevent the alarm device from becoming operable until the power supply circuit starts operating after the primary power is supplied, A power supply abnormality detection device characterized in that a normally open contact, which is closed when the power supply circuit starts operating, is provided in the power supply circuit to delay the primary power supply to the alarm device. 2. A power supply circuit that receives a primary power supply from the outside and internally generates a secondary power supply, and when an abnormality occurs in this power supply circuit, an abnormality signal from the power supply circuit is sent using the primary power supply. In order to prevent the alarm device from being able to detect the power supply abnormality after the primary power is supplied, in the power supply abnormality detection device consisting of an alarm device that reports that a power supply abnormality has occurred. A power supply abnormality detection device characterized in that a normally open contact, which is closed when the power supply circuit starts operating, is provided in the power supply circuit to delay the output of the power supply abnormality signal from the power supply circuit to the alarm device.