JP3457629B2 - Overvoltage detection control system for parallel DC power supply - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overvoltage detection control system for a parallel DC power supply, and more particularly when supplying power to a computer system from a parallel redundant DC power supply.
The present invention relates to an overvoltage detection control system for a parallel DC power supply which detects a voltage abnormality occurring in a computer main body and protects the computer main body from damage.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 9A, a computer device (power-supplied device) 100 such as a server is generally used.
The overvoltage detection is performed in a power supply unit (power supply side device) that is a power supply source, and a method of forcibly turning off the power supply unit when an abnormality is detected has been adopted. On the other hand, the parallel redundant power supply system (power supply side device) HJ0 shown in FIG. 9B may be used to continuously supply power to the computer device (power supply side device). Here, a parallel redundant power supply system is a system in which a plurality of DC power supplies are connected in parallel to supply a predetermined power, and when a part of the plurality of DC power supplies fails, the remaining normal DC power supplies are used to supply the predetermined power. A power supply system that continues to supply power.

In this parallel redundant power supply system HJ0, the voltage level is monitored on the anode side of the backflow prevention diode 111 by an overvoltage detection circuit, and when a voltage abnormality is detected, only the power supply that has detected the abnormality (for example, the backflow prevention diode 11).
(1st power supply device 110 including 1) forcibly turns off overvoltage detection. The reason for monitoring the anode side is that if the cathode side of the backflow prevention diode 111 is monitored,
Even when an abnormality occurs in one power supply device (for example, the first power supply device 110), all the power supply devices (120, 130, to n) of the parallel redundant power supply system HJ0 detect the abnormality and the other (n -1) DC power cannot be supplied to the unit.

Therefore, even if a supply abnormality occurs in any of the power supply devices (110 to n) by the monitor on the anode side, a certain power supply path (for example, the first power supply path 101a) on the electronic circuit board is connected. Overvoltage is not applied continuously,
The computer device 100 is protected from overvoltage supply.

[0005]

However, the conventional method adopted in FIG. 9 (A) has the following problems.
That is, the power supply system failure includes a failure caused by the parallel redundant power supply system side (power supply side device) and the power supply connector 11
2 erroneous connection, manufacturing failure of electronic circuit board 101, element failure (not shown), and other troubles caused by the power-supplied side such as accidents. With the configuration shown in FIG. 9B, stable power supply to the power-supplied side is possible, but it cannot be detected when an abnormality occurs on the power-supplied side. Examples of this abnormality include a first power feeding path 101a and a second power feeding path 101b.
If there is a short circuit, there is overvoltage.

The reason why the abnormality occurrence on the power-supplied side cannot be detected is that the parallel redundant power supply system monitors the voltage level on the anode side of the backflow prevention diode and detects only the voltage abnormality on the parallel redundant power supply system side (device on the power supply side). Because they are doing it. As a result, the conventional parallel redundant power supply system cannot detect the voltage abnormality except for the self side, and the computer main unit 1
00 is continuously supplied with DC power. Therefore, an overvoltage is continuously applied to the certain power feeding path (first power feeding path 101a), which damages electronic devices and other elements,
It may lead to accidents such as smoking and ignition.

SUMMARY OF THE INVENTION An object of the present invention is to provide an overvoltage detection control system for a parallel DC power supply which detects an abnormality in the power supply side device due to an overvoltage fault and forcibly turns off the power supply side device.

[0008]

Means for Solving the Problems The present invention for solving the above problems is made by paralleling the DC power source, and parallel redundant DC power supply device for supplying a predetermined electric power, electric power from the redundant parallel DC power supply Power-supplied side device to be supplied, backflow blocking diode provided between the redundant parallel DC power supply and the power-supplied side device, cathode side voltage value of the backflow blocking diode and predetermined reference voltage value comparing the magnitude of the comparison result in the state of the reference voltage value <cathode voltage value, the parallel
The switching time required to supply the prescribed power from the redundant power supply has been exceeded.
In this case, a power supply stopping means for stopping all power supply to the parallel DC power supply device is provided.

According to this configuration, for example, when the computer system is composed of the parallel DC power supply device and the computer main body unit (power-supplied side device), the computer main body unit is provided with the power supply stopping means, The power supply stop means detects the voltage abnormality caused by the main body,
Stop all power supply to the parallel DC power supply. Therefore, since the power supply to the computer main body is completely stopped, it is possible to prevent the computer main body from being damaged due to the continuous power supply from the parallel DC power supply.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the illustrated embodiments. (I) First Embodiment FIG. 1 shows a block diagram of a computer CS having a parallel redundant power supply function of this embodiment. Computer device C
The S includes a parallel redundant power supply system 10 and a computer main body 20. The parallel redundant power supply system 10 is a conventional general parallel redundant power supply system and is not modified at all.

As shown in FIG. 1, the parallel redundant power supply system 10 comprises n first to n-th parallel redundant power supplies 10-1 to 10-n for supplying direct-current wired in parallel. Since the individual parallel redundant power supplies have the same configuration, the first parallel redundant power supply 10-1
The configuration will be described as a representative. The first parallel redundant power supply 10-1 is
Converter 11 for converting the output to a predetermined power
And an overvoltage detection circuit 12 for detecting an overvoltage of the converter 11, and a second power-on signal PO2 from the computer main body 20 which will be described below, and the converter 11 is turned on according to the output of the overvoltage detection circuit 12.・ O
FF control circuit 13 and backflow prevention diode 14
With.

The computer main body section 20 includes a computer main body control section 21 including various devices such as a CPU and a memory for performing various controls of the computer main body,
The computer main body control unit 21 is provided with an overvoltage detection circuit 22 for detecting an overvoltage.

FIG. 2 is a block diagram of the overvoltage detection circuit 22. As shown in FIG. 2, the overvoltage detection circuit 22 includes a comparator 22a, a timer circuit 22b, a latch circuit 22c, and a power-on circuit 22d. The comparator 22a monitors the power feeding path of the computer main body control unit 21, and when the voltage of the power feeding path exceeds a preset reference voltage Vr,
The abnormal signal ES0 is output. The reference voltage Vr is preferably set to the maximum allowable voltage value of the computer main body control unit 21 to be monitored. The timer circuit 22b recognizes an alarm (described later) only when the abnormal signal ES0 is input for a certain period of time or longer (described later), and outputs it to the latch circuit 22c.

When the power supply of the parallel redundant power supply system 10-1 to 10-n is abnormal, the failure (power supply) of the parallel redundant power supply system side is set by setting not to output the abnormality detection signal ES1 described below. It is possible to distinguish whether the failure is a side failure) or a failure of the computer main body unit 20 (circuit side failure). The abnormality detection signal ES1 recognized as an alarm by the timer circuit 22b described below sets the latch circuit 22c. The output of the latch circuit 22c is input to the power-on circuit 22d as the power-off signal ES2. The power-on circuit 22d has a first power-on signal PO1 and a power-off signal ES.
It has two inputs of 2 and one output of the second power-on signal PO2, and the second power-on signal PO2 responds only by the first power-on signal PO1 during normal operation.
If S2 is raised (ON), the logic may be set so that the second power-on signal PO2 is forcibly turned off.
The first power-on signal PO1 resets the latch circuit 22c and resets the power-off signal ES2 by re-power-on. The timer circuit 22b and the latch circuit 22c are well known to those skilled in the art and are not directly related to the present invention, and therefore detailed description thereof will be omitted.

(1) General operation of computer apparatus CS of this embodiment The general operation of the computer apparatus CS will be described with reference to the flow chart shown in FIG. As shown in FIG. 3, power supply from the parallel redundant power supply system 10 is started (step S1).
Then, the computer main body 20 and the computer main body controller 21 start operating (step S2). After the operation starts, when the overvoltage does not occur in the computer main body control unit (step S3: NO), the computer main body control unit continues the operation. If an overvoltage is generated (step S3: YES), it is determined that the power supply side is abnormal unless the overvoltage generation time is longer than a certain time (step S4: NO), and the power supply system side eliminates the abnormal power supply. (Step S5), since the remaining normal power source continues to supply the predetermined power (step S6), the computer main body section and the computer main body control section continue to operate.

If the overvoltage generation time is equal to or longer than a certain value in step S4 (step S4: YES), it is determined that the computer main body controller 21 is abnormal, and the parallel redundant power supply system 1 is executed.
The output of all 0s is stopped (step S7), and all power supply is stopped unless the abnormality of the computer main body controller 21 is released (step S8: NO). By doing so, the computer main body control unit 21 in the abnormal state
Since the power supply to the computer is stopped, the computer main body control unit 21
Can be protected from destruction. Then, when the failure of the computer main body control unit 21 is released (step S8: YES), the parallel redundant power supply system 10 starts power supply again.

(2) Description of Operation of Embodiment Normal Operation FIG. 4 is a timing chart showing the activation of the computer CS during normal operation. As shown in FIG. 4, the first power-on signal PO1 is taken in by the power-on circuit 22d, but since the power-off signal ES2 described below has not risen (because it is OFF), it remains as the second power-on signal PO2. Is output. The second power-on signal PO2 is a signal for starting the parallel redundant power supply systems 10-1 to 10-n, and each parallel redundant power supply supplies the DC voltages V1 and V2 to the computer main body 20 through the backflow prevention diode 14. .
The DC voltage V1 is supplied to the computer main body controller 21 and the like, and the computer device CS is activated.

FIG. 5 shows a timing diagram when an overvoltage fault occurs in any one of the parallel redundant power supply systems 10-1 to 10-n. Here, it is assumed that an overvoltage fault has occurred in the first parallel redundant power supply 10-1, and the overvoltage detection value of that power supply is set to Va1. Further, the forward voltage drop of the backflow prevention diode 14 is Vf, and the relationship with the reference voltage Vr of the comparator 22a is Va1-V.
The following description will be made assuming that f>Vr> V1.

As shown in FIG. 5, a parallel redundant power supply system
If an abnormality occurs in 10-1 and the anode side voltage V11 of the backflow prevention diode 14 exceeds Vr + Vf to reach Va1 and falls to Vr + Vf again, the time T1 is
During one hour, the comparator 22a outputs the abnormal signal ES0. In order to prevent the overvoltage detection circuit 22 from operating at the time of a power failure, the timer circuit 22b uses a certain period of time T2.
(However, T2> T1) If there is no abnormality notification above, the alarm is not recognized and the output signal (power-off signal ES described next)
Set not to send 2). By setting in this way, the DC power V1 and V2 can be continuously supplied to the computer main body unit 20 by the other (n-1) units even when only one power source fails.

In case of failure of computer main body control section FIG. 6 shows a timing chart when an overvoltage failure occurs in the computer main body control section 21. As shown in FIG.
In the computer main body control unit 21, a DC voltage V1 (for example, 5 V) and a DC voltage V2 (for example, 12 V
Suppose that a fault occurs in which V) is short-circuited. However, the following description will be given assuming that the relationship between the DC voltages V1 and V2 and the reference voltage Vr of the comparator 22a is V2>Vr> V1.

As shown in FIG. 6, when V2 is applied to the power supply path due to a short-circuit fault of the computer main body control unit 21 or the like, the reverse current preventing diode 14 is provided, so that the parallel redundant power supply systems 10-1 to 10-n are provided. Cannot detect voltage abnormalities other than itself. Here, the comparator 22a outputs the abnormal signal ES0 indicating that the voltage V2 exceeding the reference voltage Vr is applied.
Is output. When the timer circuit 22b receives an abnormality notification for a certain period of time T2 or more, it recognizes the occurrence of a short-circuit fault in the computer main body control unit 21 and sends an abnormality detection signal ES1.
The latch circuit 22c is set.

The output of the latch circuit 22c is the power-off signal ES.
2 is input to the power-on circuit 22d and the power-off signal ES2 is raised (ON), the second power-on signal PO2 is forced off. That is, all the parallel redundant power supplies 10-1 to 10-n are forcibly turned off. When the short circuit fault is released, the first power-on signal PO
1 is turned on to reset the latch circuit 22c, and the power-off signal ES2 is reset by re-powering on.

(II) Second Embodiment FIG. 7 shows a block diagram of the computer main body 20A of this embodiment. As shown in FIG. 7, the computer main body 20
I2C device 30 for monitoring computer status in A
Is provided. The I2C device 30 outputs the power-off signal ES2
Is input and the information is sent to software or the like that manages the state of the computer. Therefore, by collecting the log (collecting a record of the failure history), the computer device C
At the time of maintenance and inspection of S, it is possible to easily determine whether the abnormality is on the parallel redundant power supply system side or the computer main body side.

(III) Third Embodiment FIG. 8 shows a block diagram of this embodiment. In the first and second embodiments, the overvoltage detection value Va1 of the parallel redundant power supply and the maximum allowable voltage value of the computer main body control unit 21 (comparator 22a
(Va1-Vf>Vr> V) in consideration of the reference voltage Vr of
1) A timer circuit 22b is provided to prevent the overvoltage detection circuit 11 from operating when a power source overvoltage fault occurs. In this embodiment, the timer circuit 22b is omitted.

As shown in FIG. 8, since the timer circuit 22b is deleted in the overvoltage detection control section 22A, the abnormal signal ES
0 is directly applied to the latch circuit 22c. This is clearly the case where the relationship of Vr>Va1-Vf> V1 is established. In this case, the overvoltage detection control circuit 22A operates only when a failure occurs in the computer main body control section 21, and the overvoltage detection control circuit 22A does not operate when an overvoltage failure occurs on the parallel redundant power supply side. In this embodiment, Vr> Va
Only when the relationship of 1-Vf> V1 is established, there is an advantage that the overvoltage detection circuit can be easily configured.

In the first to third embodiments,
Although the overvoltage detection for the DC voltage V1 has been described, when the parallel redundant power source has multiple outputs (for example, 5V, 12
V, 24V, etc.) can be provided with a similar overvoltage detection circuit for each output, and there is no particular limitation on the number of overvoltage detection circuits. In the first to third embodiments, the case where the power supply system is the parallel redundant power supply system has been described. However, a parallel DC power supply system in which a plurality of DC power supplies capable of independently supplying a predetermined power are connected in parallel is provided. Needless to say, the present invention can be applied to.

[0027]

As described above, according to the present invention, the overvoltage detection circuit is provided on the power-supplied device (computer main body) side, and the function of forcibly turning off all the parallel redundant power supply systems when an abnormality is detected is provided. Therefore, it is possible to obtain an effect that an expensive computer main body is prevented from being damaged and an accident such as smoking or ignition is prevented.

Further, since the timer circuit is provided in the overvoltage detection control section, the overvoltage detection control section does not operate when an abnormality occurs on the side of the parallel redundant power supply system. Therefore, the reference voltage value can be freely set according to the computer main body to be monitored. The parallel redundant power supply system side does not require any special additional specifications, so that the existing parallel redundant power supply can be used as it is.

[Brief description of drawings]

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

FIG. 2 is a block diagram of an overvoltage detection controller in the first embodiment.

FIG. 3 is a flowchart showing a schematic operation of the embodiment.

FIG. 4 is a time chart during normal operation of the overvoltage detection control unit.

FIG. 5 is a time chart in the overvoltage detection control unit at the time of an overvoltage fault of the parallel redundant power supply which constitutes the same embodiment.

FIG. 6 is a time chart of an overvoltage detection control unit at the time of an overvoltage fault in the computer main body control unit which constitutes the embodiment.

FIG. 7 is a block diagram of an overvoltage detection controller in the second embodiment.

FIG. 8 is a block diagram of an overvoltage detection controller in the third embodiment.

9A and 9B are diagrams showing a conventional example, in which FIG. 9A is a diagram for explaining a general forced power-off, and FIG. 9B is a block diagram of a parallel redundant power supply system.

[Explanation of symbols]

CS computer equipment 10 Parallel redundant power supply system 10-1 to 10-n Parallel redundant power supply 20 computer body 21 Computer main unit controller 22 Overvoltage detection controller

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-8-251915 (JP, A) JP-A-11-252907 (JP, A) JP-A-5-189065 (JP, A) JP-A-10- 108363 (JP, A) JP 4-17520 (JP, A) JP 5-153779 (JP, A) JP 5-260654 (JP, A) JP 11-98833 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02H 3/20-3/253 G05F 1/00 G05F 1/10 H02J 1/00 H02J 1/10

Claims (5)

(57) [Claims] 1. A result by the plurality of direct current power source connected in parallel, and parallel redundant DC power supply device for supplying a predetermined power, and the power feeding side apparatus that receives power from the redundant parallel DC power supply, and the redundant parallel DC power supply The backflow blocking diode provided between the power-supplied side device and the cathode-side voltage value of the backflow-blocking diode and a predetermined reference voltage value are compared in magnitude, and the comparison result is the reference voltage value <cathode side voltage value. In the state of
Switching time required to supply the predetermined power of the parallel redundant power supply
And an electric power supply stopping means for stopping all electric power supply to the parallel DC power supply device when the power supply exceeds the above condition. 2. The overvoltage detection control system for the parallel DC power supply according to claim 1, wherein the reference value is a maximum allowable voltage value of the power-supplied side device. 3. The parallel DC power supply device connects a plurality of DC power supplies in parallel to supply a predetermined electric power, and when a part of the plurality of DC power supplies fails, the normal DC power supply left is used to supply the predetermined power. The overvoltage detection control system for a parallel DC power supply according to claim 1 or 2, which is a parallel redundant DC power supply that continues to supply a predetermined electric power. 4. The overvoltage detection control for a parallel DC power supply according to claim 1, further comprising a recording unit for recording an operation result history of the power supply stopping unit. system. 5. A plurality of direct current power supplies are connected in parallel,
A parallel DC power supply device that supplies constant power, a power supply-side device that receives power from the parallel DC power supply, a backflow blocking diode that is provided between the parallel DC power supply and the power supply side device, and the backflow blocking diode. Of the cathode side voltage value and a predetermined reference voltage value are compared, and when the comparison result exceeds a predetermined time in the state of the reference voltage value <the cathode side voltage value, all of the parallel DC power supply devices are Power supply stopping means for stopping power supply, and recording means for recording an operation result history of the power supply stopping means
Overvoltage detection control system for parallel DC power supply, characterized by having a.