JPH0630534B2 - Power supply failure detection circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a failure detection circuit for a power supply device including a plurality of power supply units.

[Conventional technology]

FIG. 2 is a diagram showing a failure detection circuit of a conventional power supply device. In FIG. 2, (1) is a power supply device and (10) is a first power supply unit in this power supply device. (11) is a power supply in the power supply unit (10), the output of which is supplied to the load (12). (13) is a relay for detecting an abnormality that operates when the power supply provided at the output end of the power supply (11) is normal, and (14) is a closed contact when the relay operates.

(20), ..., (n0) are the second, ..., Nth power supply units, which are similar to the first power supply unit (10). (100) is a failure detection device for detecting an abnormality in each of the power supplies (11), (21), ... (n1), and (101) is each of the relays (13), (23) ...
Check circuit composed of (n3) closed contacts (14), (24) ... (n4) connected in series, (102) a signal supply circuit for supplying a check signal to this check circuit, (103) ) Is the terminal connection for returning the above-mentioned check signal, (10
4) is a signal receiving circuit that detects whether or not the check signal is returned.

The failure detection circuit of the conventional power supply device is configured as described above, and the check signal is sent from the signal supply circuit (102) in the failure detection device (100) to the power supply unit (10). If the power supply (11) in the power supply unit (10) is generating voltage normally,
An abnormality detection relay that operates when the power is normal (1
3) is excited, and the closed contact (14) is closed when it is activated. Therefore, the check signal passes through the power supply unit (10) and is sent to the next power supply unit (20). Even if the power supply (21) is normal, the check signal is the contact of the relay (23) for abnormality detection.
It passes through (24) and is sent to the next power unit.

In this way, the check signals are sequentially sent, and when they are sent to the power supply unit at the final stage, they are returned by the termination connection (103) and enter the signal receiving circuit (104) that detects the presence or absence of the check signal return. Therefore, if even one of the plurality of power supply units has an abnormality (a state in which a normal voltage is not generated), the check signal does not reach the signal receiving circuit (104) and the abnormality can be detected.

[Problems to be solved by the invention]

In the conventional power supply device failure detection circuit as described above, the power supply units are connected in series so that the check signal sequentially passes through the power supply units, and the check signal is returned after the final-stage power supply unit. The circuit for the check must be constructed by terminating the wiring for the purpose, and different wiring work is required every time the number of power supply units changes, which is a problem in standardized mass production design and manufacturing.

The present invention has been made to solve such a problem, and the connection between the above-mentioned power supply units is made into a mother board, and the power supply unit at the final stage is simply inserted by simply inserting the power supply unit so that the check signal is automatically returned.
It is an object of the present invention to obtain a failure detection circuit for a power supply device that eliminates the need for the termination wiring.

[Means for solving problems]

In the power supply device failure detection circuit according to the present invention, in a power supply device using a plurality of power supply units, each power supply unit of the power supply device has a relay unit that operates when the power supply is normal, and a power supply unit of the next stage. A second relay, which operates when the power supply is turned on, is provided so that the check signal is automatically returned by the own power supply unit when there is no next-stage power supply unit.

[Action]

In the present invention, when the generated voltage of the power supply unit is normal, the contact of the relay is closed, so the check signal that has passed through each power supply unit is sent to the next stage.
In the power supply unit where normal voltage is not generated,
Since the relay contacts open to stop the check signal from passing, the check signal does not return and the conventional signal operation is notified to the signal receiving circuit of the check signal.In addition, the power supply unit supplies power to the next stage. The second relay, which operates when the unit is present,
When there is no power supply unit in the next stage, it works to automatically return the check signal in the own power supply unit. Therefore, it is not necessary to terminate the wiring for returning the check signal after the power supply unit at the final stage, and the power supply device with the failure detection circuit can be configured only by standardizing the motherboard and inserting the power supply unit.

Example of Invention

FIG. 1 shows an embodiment of the present invention. (100), (101), (10
2), (104), (11), (12), (13) and (14) are the same as those of the conventional device.

(110) is the first power supply unit in the power supply (11), (15)
Is a second relay provided in the power supply unit (110), which is patterned on the motherboard in the power supply unit so that the power supply unit in the next stage is excited, and the connection part (27) of the power supply unit in the next stage After that, an exciting circuit is formed. The relay (1
The inactive closed contact (16) of 5) has one end connected in series with the closed contact (14) of the first relay (14) during operation and the check circuit (101) connected in series to the power unit of the next stage. , And the other end is connected to the signal receiving circuit (104).

With the above configuration, when the generated voltage of the power supply (11) is normal, the first relay contact (14) is closed, so that the check signal coming from the signal supply circuit (102) is the contact (14). If there is a power unit in the next stage, the contact (16) is opened, and the check signal is sent to the power unit (120) in the next stage through the check circuit (101).

However, if there is no power supply unit in the next stage, the second relay (15) is not excited and the contact (16) is closed, so the contact (14)
The check pulse that has passed through forms a return circuit that is sent back to the signal receiving circuit (104) via the contact (16).

Therefore, if the generated voltage of the power supply (11) drops or is cut off, the first relay contact (14) opens and the check signal is cut off by this, so the check signal is transmitted to the signal receiving circuit (1
It is the same as the conventional device that it can detect an abnormality without reaching 04).

The operation of one power supply unit has been described above. However, even if n power supply units are accommodated, a check signal path for failure detection is automatically completed.

In addition to the simple method of using a DC voltage or a commercial AC voltage as the check signal, an AC voltage of a special frequency that is strong against contact, inductive interference, or the like, or a pulse signal can be used. Signal receiving circuit (104)
Needless to say, prepare.

〔The invention's effect〕

As described above, according to the present invention, another relay is added in the power supply unit, and the check signal is automatically changed according to the presence or absence of the next-stage power supply unit. There is no need for termination wiring, and the power supply unit and the power supply unit to be inserted thereinto can be standardized, and the failure detection circuit of the power supply unit can be constructed at low cost.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a failure detection circuit of a power supply device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a failure detection circuit of a conventional power supply device. In the figure, (1) is the power supply device, (100) is the failure detection device, and (10)
1) is a check circuit, (102) is a signal supply circuit, (104) is a signal receiving circuit, (110) is a first power supply unit, (11) is a power supply,
(13) is the first relay, (14) is a closed contact when the relay is activated,
(15) is the second relay, (16) is the contact when the relay is inoperative, (120), ..., (1nO) is the second, ..., Nth power supply unit and the first power supply unit ( Same as 110). In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] 1. A power supply device comprising a plurality of power supply units each comprising a power supply and a first relay that operates when the power supply is normal, and when the power supply unit is present in the next stage provided in the power supply unit. Via a second relay that operates, a check circuit formed by connecting in operation the closed contacts of the first relay of each power supply unit, and a signal supply circuit that supplies a check signal to this check circuit and the above check circuit. A signal receiving circuit for receiving the above-mentioned check signal,
A non-operating closed contact of the second relay, one end of which is connected to a series connection point of the self-stage and the next stage in the check circuit and the other end of which is connected to the signal receiving circuit. Power supply failure detection circuit. 2. A failure detection circuit for a power supply device according to claim 1, wherein the signal supply circuit is a DC voltage generation circuit. 3. A failure detection circuit for a power supply device according to claim 1, wherein the signal supply circuit is an AC voltage generation circuit. 4. A failure detection circuit for a power supply device according to claim 1, wherein the signal supply circuit is a pulse signal generation circuit.