JP2891962B2 - Power control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device, and more particularly to a power supply control device for controlling power supply cutoff when an abnormality occurs in a power supply unit used in an information processing device or the like.

[0002]

2. Description of the Related Art Generally, in this type of power supply control device, when a power supply is turned on, a power-on signal is sequentially transmitted based on a power-on sequence determined in order from a power supply unit having a lower output potential to a power supply unit having a higher output potential. Power is supplied to a logic element, which is a load. Further, at the time of power-off, a power-off signal is sequentially transmitted based on a power-off sequence determined from a power supply unit having a high output potential to a power supply unit having a low output potential, so that power to a logic element or the like as a load is cut off. .

In the power supply control device, when a low voltage or an overvoltage occurs in a power supply unit serving as a power supply source, a state in which the above-described power supply disconnection sequence is reversed is minimized, and a logic element serving as a load is controlled. A power-off sequence for preventing deterioration or destruction of the power supply is used.

For example, Japanese Patent Application Laid-Open No. 5-204496 discloses that (1) a power failure occurs in response to a power failure signal output from a power supply unit, regardless of the predetermined power-off sequence described above. Power supply unit,
(2) detection of a power failure signal for a power supply unit that outputs a potential equal to the power supply unit in which the power failure has occurred, and (3) a power supply unit that outputs a higher voltage than the power supply unit in which the power failure has occurred. At the same time (1)
A power supply unit that transmits a power supply disconnection signal to the power supply unit of (1) to (3) and outputs a lower potential than the power supply unit in which the power supply abnormality of (1) has occurred is supplied according to a predetermined disconnection sequence. A technique for transmitting a disconnection signal is disclosed.

[0005]

However, in the conventional power supply control device, there is no means for detecting an abnormality in the power supply sequence on the side of the power supply supply unit such as a logic element as a load. There is a problem that an abnormality in the power supply sequence generated between the power supply unit and the power supply unit cannot be detected. The present invention has been made in view of the above circumstances, and when an operation failure occurs due to an abnormality in a power supply sequence that cannot be detected by a power supply unit, reduces the time required to determine the cause of the abnormality. It is an object of the present invention to provide a power supply control device that can perform the control.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of power supply devices for supplying power, and power supply control means for controlling power supply and cutoff of power to the power supply devices. A power supply unit having a power supply unit, a power supply unit, a power supply unit, and a power supply unit. A power supply unit having a detection unit for detecting an abnormality in the power supply sequence. Further, according to the present invention, a power supply unit having a plurality of power supply devices for supplying power, a power supply control unit for controlling supply of power to the power supply device and cutoff of power supply, and one of the power supply devices is provided with a power supply. A measuring unit that measures the time from the start of supply to the time when another power supply starts to supply power, and is connected to the power control unit, and detects an abnormality in the power supply sequence according to the measurement result of the measuring unit. And a detecting means for transmitting an emergency power-off signal to the power control means when the power supply is performed. Further, in the present invention, the detecting means may include a set value that defines a predetermined time to be input, and a setting value that is set between when one of the power supply devices starts supplying power and when another power supply device starts supplying power. It is preferable to output an abnormality notification signal indicating that the power supply unit is abnormal according to the comparison with the time. Further, in the present invention, the power supply control unit operates the plurality of power supply devices in a preset power supply sequence, and the measurement unit is provided corresponding to the plurality of power supply devices, and a corresponding power supply device A power supply device, which is a counter circuit that starts counting from a time point when power is supplied, wherein the detecting unit is turned on according to a predetermined power supply sequence before a time point when power supply is started from one of the power supply devices. It is preferable to send the emergency power-off signal when the count value of the counter circuit corresponding to the above is zero.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a power supply control device according to an embodiment of the present invention will be described with reference to the drawings. [First Embodiment] FIG. 1 is a block diagram showing a configuration of a power supply control device according to a first embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a power supply unit, which supplies power to a logic operation unit 20 having a logic element or the like as a load. This power supply unit 10
Has a power control unit (power control unit) 12, a first power unit 14, a second power unit 16, and a third power unit 18 (a plurality of power devices).

[0008] The power supply control section 12 is for controlling the turning on and off of the power of the first to third power supply units 14 to 18. The power control unit 12
Receives a voltage output from the first power supply unit 14 to the third power supply unit 18, verifies that the power-on sequence is in accordance with a predetermined sequence, and if an abnormality is detected, the first power supply unit 14 to the third power supply unit 3 power supply unit 18
To turn off the power supply. First
The power supply unit 14 to the third power supply unit 18 receive an on / off signal output from the power supply control unit 12 and output a prescribed potential. Each of the power supply units 14 to 18 has a different control unit, and supplies each output power defined by the control unit to the logic operation unit 20.

The logic operation section 20 is for controlling the power supply section 10, and has a first counter circuit 22, a second counter circuit 24 (counting means), and a comparison circuit 26 (detection means). The first counter circuit 22 includes a first
The counting operation is started when the potential supplied from the first power supply unit 14 reaches a specified value.

The second counter circuit 24 is connected to the second power supply unit 16 and starts counting when the potential supplied from the second power supply unit 16 reaches a predetermined value. The comparator 29 is connected to the first counter 22, the second counter 24, and the third power supply unit 18. Also, the comparison circuit 26 determines whether the power-on sequence is normally performed according to the count values of the first counter circuit 22 and the second counter circuit 24, that is, the first power supply unit 14 operates. Is set, and a set value that defines the time from when the second power supply unit 16 starts operating is input. The comparison circuit 26 has a third
When the potential supplied from the power supply unit 18 reaches a predetermined value, the count value of the first counter circuit 22 and the count value of the second counter circuit 24 are compared with a predetermined set value. To generate an abnormality notification signal.

Next, the operation of the power supply control device according to the first embodiment of the present invention will be described in detail with reference to FIG.
In the present embodiment, the first power supply unit 14 and the second
It is assumed that the power supply sequence is executed in the order of the power supply unit 16 and the third power supply unit 18 in this order. The power-on interval of each of the power supply units 14 to 18 is at least 100 ms.
And the worst value is assumed to be 50 ms.
However, for the worst value, it is necessary to actually consider the variation of the logic element used in each control circuit.

When the operation starts, first, the power control unit 12
Sends a power-on instruction to each of the power supply units 14 to 18 sequentially so as to form a power-on sequence. The power-on instruction is first sent to the first power supply unit 14. When this power-on instruction is sent, the first power supply unit 14 outputs a specified potential. When a predetermined potential is output from the first power supply unit 14, the first counter circuit 22 starts a counting operation.

Next, the power supply control unit 12 sends a power-on instruction to the second power supply unit 16. When the power-on instruction is transmitted, the second power supply unit 16 outputs a specified potential. When the predetermined potential is output from the second power supply unit 16, the second counter circuit 24 starts the counting operation.

Finally, the power control unit 12 sends a power-on instruction to the third power unit 18. When the power-on instruction is transmitted, the third power supply unit 18 outputs a specified potential. When the predetermined potential is output from the third power supply unit 18, the comparison circuit 26 starts operating, and the count value of the first counter circuit 22 (first count value) and the count value of the second counter circuit 24 ( The second count value) is compared with a predetermined set value. The set value is set to the worst value of 50 ms.

The comparison circuit 26 includes a first counter circuit 22
Is compared with the count value of the second counter circuit 24. If the first count value is at least 50 ms longer than the second count value, that is, larger than the set value, the first power supply unit 1
It is determined that the power-on sequence of the output potential of the power supply unit 4 and the output potential of the second power supply unit 16 is normal, and the subsequent power-on sequence is executed. On the other hand, if the first count value is 50 ms or more than the second count value, that is, if the first count value is smaller than the above set value, it is determined that there is an abnormality, and an abnormality notification signal is transmitted.

On the other hand, the comparison circuit 26 determines that the second count value is 50
If it is not shorter than ms, it is determined that the power-on sequence of the output potential of the second power supply unit 16 and the output potential of the third power supply unit 18 is normal, and the abnormality notification signal is not transmitted. In this case, it is determined that an abnormality has occurred, and an abnormality notification signal is transmitted. As described above, in the communication control device according to the first embodiment of the present invention, since the logic operation unit 20 detects the power supply unit 10 or more, the power supply unit 1
Even if an operation failure occurs due to an abnormality in the power supply sequence that cannot be detected conventionally at 0, the abnormality can be detected and the time required to investigate the cause of the abnormality can be reduced.

[Second Embodiment] Next, a power supply control device according to a second embodiment of the present invention will be described. FIG. 2 is a block diagram showing the configuration of the power supply control device according to the second embodiment of the present invention. The same members as those of the power supply control device according to the first embodiment of the present invention shown in FIG. Attached
The description is omitted.

The power control device according to the second embodiment of the present invention shown in FIG. 2 is different from the power control device according to the first embodiment of the present invention shown in FIG. In place of the unit 20, a logic operation unit 40 for sending an output of the comparison circuit 26 to the power supply unit 30 is provided, and a power supply control unit 32 to which a signal output from the logic operation unit 30 is input is provided. This is the point provided with the unit 30.

The signal output from the comparison circuit 26 is
It is input to the power control unit 32 as an emergency power-off signal.
The power supply control unit 32 provided in the power supply unit 30
6 is provided with an emergency power-off signal input terminal for inputting an emergency power-off signal. The power control unit 32 controls a power-on sequence and a power-off sequence of the first to third power units 12 to 14 according to the emergency power-off signal input to the emergency power-off signal input terminal.

In the above configuration, when the power-on sequence is started, the power control unit 32 sequentially sends a power-on instruction to each of the power units 14 to 18 so that the power-on sequence is performed. When the first power supply unit 12 and the second power supply unit 14 sequentially output the specified potential, the corresponding first counter circuit 22 and second counter circuit 2
4 starts the counting operation. Finally, when the predetermined potential is output from the third power supply unit 18, the comparison circuit 11 starts operating immediately after the predetermined potential is output.

Here, when the comparison circuit 26 detects that the count value of the first counter circuit 22 is 0 (zero), it sends an emergency power-off signal to the power control unit 32. In other words, in the normal power-on sequence, the first power supply unit 14, the second power supply unit 16, and the third power supply unit 18 are performed in this order. That the count value of the first counter circuit 22 is 0 at the point in time when is output means that a predetermined potential is not output from the first power supply unit 14 and a normal power-on sequence is not performed. Therefore, the comparison circuit 26 outputs an emergency power-off signal.

The emergency power-off signal output from the comparison circuit 26 is input to the power control unit 32. Power control unit 32
When receiving the emergency power-off signal, the power supply unit sends a power-off signal to all the power units under control, that is, the first to third power units 14 to 18. Further, the comparison circuit 26 outputs the second counter circuit 24 when the predetermined potential is output from the third power supply unit 18.
Similarly, when detecting that the count value output from is 0 (zero), the emergency power-off signal is transmitted.

The power supply control device according to the second embodiment of the present invention described above has, in addition to the effects obtained by the power supply control device according to the first embodiment, a case where the comparison circuit 26 detects inversion of the power supply sequence. An emergency power-off signal is sent to the power supply control unit 32, and the power supply control unit 32 stops the operations of the first power supply unit 14 to the third power supply unit 18, thereby deteriorating or destroying a logic element as a load. Can be prevented.

In the above embodiment of the present invention,
Although the case where three power supply units 14 to 18 are used has been described, it goes without saying that the number of power supply units is not limited. Although the output voltage of each power supply unit is not specified, it is not particularly limited and can be set arbitrarily.

[0025]

As described above, according to the present invention,
Since an abnormality in the power supply sequence is detected on the power-supplied side, there is an effect that the cause of an operation failure caused by the abnormality in the power supply sequence can be investigated at an early stage. Further, according to the present invention, since the detection means for detecting the reversal of the power supply sequence at the power-supplied portion and outputting the emergency power-off signal to the power control portion is provided, deterioration or destruction of the load logic element or the like is prevented. There is an effect that it can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a power supply control device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a power supply control device according to a second embodiment of the present invention.

[Explanation of symbols]

 10, 30 power supply unit 12, 32 power supply control unit (power supply control unit) 14, 16, 18 power supply unit (power supply device) 22, 24 counter circuit (measurement unit) 26 comparison circuit (detection unit)

Claims (4)

(57) [Claims] A power supply unit having a plurality of power supply units for supplying power; a power supply control unit for controlling supply of power to the power supply unit and shutting off of the power supply; and one of the power supply units supplies power. A power supply unit having a measuring unit for measuring the time from when the power supply starts until another power supply device starts to supply power, and a detecting unit for detecting an abnormality in a power supply sequence in accordance with the measurement result of the measuring unit. A power supply control device comprising: 2. A power supply unit comprising: a plurality of power supply devices for supplying power; a power supply control unit for controlling supply of power and cutoff of power to the power supply device; and one of the power supply devices supplies power. A measuring unit that measures the time from when the power supply is started until another power supply device starts to supply power, and when an abnormality in the power supply sequence is detected in accordance with the measurement result of the measuring unit, which is connected to the power control unit. A power supply unit having a detection unit for sending an emergency power-off signal to the power control unit. 3. The method according to claim 1, wherein the detecting unit includes a setting value defining a predetermined time to be input, and a setting value between when one of the power supply devices starts power supply and when another power supply device starts power supply. The power supply control device according to claim 1, wherein an abnormality notification signal indicating that the power supply unit is abnormal is output according to a comparison with time. 4. The power supply control means operates the plurality of power supply apparatuses in a preset power supply sequence, and the measuring means is provided corresponding to the plurality of power supply apparatuses, and supplies power from the corresponding power supply apparatus. Is a counter circuit that starts counting from a point in time when the power supply is supplied. The detection means includes a power supply that is turned on in accordance with a predetermined power supply sequence before a point in time when power supply is started from one of the power supply apparatuses. 3. The power supply control device according to claim 2, wherein the emergency power-off signal is transmitted when the count value of the corresponding counter circuit is zero.