JP2000102194A - Dual input high performance power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dual input high performance power supply system which can realize the reduction in size of an equipment without deteriorating its uninterruption operation and uninterruption maintenance functions. SOLUTION: An A-system power supply supplies power to a regulated power supply through an INBOX (A system). When the A-system power supply is OFF, a B-system power supply supplies power to the regulated power supply through an INBOX (B-system). In each INBOX, the output of an I/F section controls a relay driving circuit. In each INBOX, a signal obtained by ANDing an auxiliary power supply OK signal and a power supply OK signal is used as the positive input for an AND gate of the I/F section. For the negative input for the AND gate of the I/F section of the INBOX (A system), the ground is used. For the negative input for the AND gate of the I/F section of the INBOX (B system), a power supply OK signal of the INBOX (A system) is used. As a result, when the A-system power supply is ON, a relay (A) is ON and a relay (B) is OFF and therefore the A-system power supply is connected to the regulated power supply. On the other hand, when the A-system power supply is OFF, the relay (A) is OFF and the relay (B) is ON and therefore the B-system power supply is connected to the regulated power supply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a redundant power supply system, and more particularly to a system applied to a device such as an external storage device of an electronic computer system which requires non-stop operation and maintenance.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing an example of a conventional dual input power supply system of a device. Here, external input power supplies VIN1 and VIN6 supplied to the apparatus, main switches 2 and 7 for turning on and off the external input power supply (CB is a circuit breaker in the figure), and a stabilization operation connected to the external input power supply. 1 shows a power supply 3 and a load (such as a hard disk drive) 4 which operates by receiving a DC output voltage from a stabilized power supply. Normally, the input power is supplied from two systems, A system and B system.
Are in the ON state, and input power is supplied to the stabilized power supply 3 from both the A system and the B system. In the case of FIG. 4, it is assumed that three stabilizing power supplies are required to drive the hard disk group, and the stabilizing power supplies with hatching indicate spare stabilizing power supplies.

In this state, even if the external input power of the system A is cut off, the external input power of the system B is input, so that half of the stabilized power supplies 3 continue to operate and affect the load 4. Non-stop operation and non-stop maintenance of the device can be realized. In order to continue the normal operation of the apparatus even when the external input power supply is disconnected, the number of the stabilized power supplies 3 required is twice as many as the truly required number. In addition, in the market, there is an uninterruptible power supply (hereinafter, referred to as a UPS) as an input for non-stop operation of the device, which is referred to as a non-stop operation. When it switches to battery operation, it can supply power only for a finite time. In addition, it is necessary to install it separately from the whole system, and it is large and expensive.

[0004]

In the dual-input power supply system of the conventional apparatus shown in FIG. 4, non-stop operation and non-stop maintenance of the power supply, hot-swap of the stabilized power supply (when the power supply is frequently used) When replacing a particular power supply for maintenance or damage, replace the target power supply without stopping other power supplies) and downsizing (high functionality, miniaturization). There's a problem. In order to continue the normal operation of the apparatus even when the external input power supply is disconnected, the stabilized power supplies 3 in FIG. 4 require twice as many stabilized power supplies as the truly required number. The mounting capacity of the stabilized power supply is also doubled, making it difficult to reduce the size of the device, and the use efficiency of the stabilized power supply is also 50%. Ultimately, the cost will be high. Therefore, the present invention, without impairing the function of non-stop operation and non-stop maintenance of the power supply system in the device,
It is an object of the present invention to obtain a dual-input high-performance power supply system capable of realizing miniaturization of the device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an input dual high-performance power supply system for duplicating an AC or DC external input power supply (hereinafter referred to as an external input power supply) for supplying power to a device. Then, each of the external input power supplies and the device are connected by an external input power supply switching circuit (hereinafter referred to as INBOX), and each of the INBOXs is connected.
Switch means for connecting the external input power supply to the device, control means for detecting on / off of the external input power supply and outputting a control signal for turning on / off the switch means, and control of the own INBOX When only the control signal from the means is input, the switch means is turned on / off in accordance with the control signal, and the control signal from the control means of the own INBOX and the control signal from the control means of another INBOX are inputted. When the control signal from the other INBOX is on, the switch means is turned off, and the other
When the control signal from the NBOX is off, a switch control means for turning on / off the switch means in accordance with the control signal from the own INBOX is provided.

[0006] Further, an I / O connected to one of the external input power supplies.
The switch control means of the NBOX (hereinafter referred to as the first INBOX) receives only the control signal from the control means of its own INBOX and receives the INB connected to the other external input power supply.
OX (hereinafter, referred to as a second INBOX) includes a first I
The control signal line from the control unit of the NBOX is connected, and the switch control unit of the second INBOX receives the control signal from the control unit of the own INBOX and the control signal from the control unit of the first INBOX. In this case, when one external input power supply is on, the external input power supply and the device are connected to the first I
Connected by an NBOX, the other external input power supply and the device are cut off by the second INBOX, and when one external input power supply is turned off, the external input power supply and the device are cut off by the first INBOX; And the device are connected by the second INBOX if the other external input power is on, so that the external input power connected to the device is switched from one external input power to the other external input power. .

In addition, the first INBOX to the second INBOX
The connection of the control signal line from the control means of the INBOX or the connection of the control signal line from the control means of the second INBOX to the first INBOX is set by the connection means provided outside the INBOX. Specification INB
OX can be used. In addition, the IN
The BOX has a plurality of the switch means. Further, the switch means is constituted by a relay and a relay drive circuit, and simultaneous switching of both external input power supplies to the device at the time of switching of the external input power supply is prevented by an operation time difference of ON / OFF of the relay. I have.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below. 5 and 6 are diagrams for explaining the outline of the present invention. As shown in FIG. 5, according to the present invention, in addition to the main switches 2 and 7 inserted in the lines of the external input power supplies 1 and 6, relays 8 and 10 and control for performing on / off control of the aforementioned relays An INBOX consisting of a circuit 5 is inserted for each external input power supply system, and ON / OFF of relays 8 and 10
By connecting a control signal for performing the OFF control between the INBOXs, the external input power supplies 1 and 6 become inputs only via the leading INBOX side (either A system or B system), and It is supplied to the stabilized power supply 3. With this configuration, during normal use, the external input power supplies 1 and 6
It is supplied to the stabilized power supply 3 via the OX. When the leading INBOX side of the external input power supplies 1 and 6 has a power failure,
By instantaneously switching to the other INBOX side and having no effect on the output of the stabilized power supply 3 at the subsequent stage, the required number of the stabilized power supplies 3 can be reduced and the device can be downsized.

In FIG. 6, while the external input power supplies 1 and 6 are being input, the control circuit 5 in the INBOX (A system) 14 generates and outputs an ON signal for the relay (A) 8. Upon receiving the signal, the relay (A) 8 is turned on. At the same time, the OFF signal of the relay (B) 10 is transmitted to the INBOX (B system) 16 through the signal interface line,
The relay (B) 10 of the INBOX (B system) 16 is turned off. Therefore, during normal operation, power is supplied only from the INBOX (A system) 14. When the supply of the external input power supply 1 is stopped (at the time of a power failure), the INBOX (A system) 14
The relay (A) 8 is turned off in response to a signal from the control circuit unit 5 inside. On the contrary, the relay (B) 10 is turned on, and the power supply to the stabilized power supply 3 at the subsequent stage is supplied to the INBOX (B system) 16.
It will be done via. Further, when the supply of the external input power supply 1 is started (during power recovery), the INBOX (A
(A) Relay (A) by a signal from the control circuit unit in 14
8 turns on. Conversely, the relay (B) 10 is turned off, and the power supply to the stabilized power supply 3 at the subsequent stage is supplied to the INBOX (A system) 1.
4 will be performed. From the above, led INB
OX means an INBOX on a side that is controlled so that it can return to the original state when power is restored. Even if the supply to the external input power supply 6 is stopped or started, the power supply to the stabilized power supply 3 at the subsequent stage is performed from the INBOX (A system) 14, and no state change occurs. Therefore, even when the power of the external input power supply 1 or 6 is interrupted, the operation of the non-stop operation is performed without affecting the output of the stabilized power supply at the subsequent stage.

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an input dual high performance power supply system according to the present invention.
In (A system) 14, an on / off relay (A) ス イ ッ チ as a switching means of an external input power supply and a relay driving circuit ＄ thereof are connected in series with 8 and 9 so that there is no redundancy for relay failure. Is secured. INBOX
The same applies to the relays (B) 10 and 11 on the (B system) 16 side. Also, a relay drive circuit for turning on / off the above-mentioned relays (A) 8 and 9 and an I / F section for transmitting a control signal and controlling the relay drive circuit are provided for each relay unit, thereby providing a drive circuit. The system has redundancy to improve reliability. Note that all the relay drive circuits may be controlled by one I / F unit. The relay and the relay drive circuit operate as switching means for the external input power. The same applies to the redundancy of the relay drive system of the INBOX (B system) 16. In this configuration, the leading INBOX
Is an INBOX (A system) 14. This is an INBOX
Both the (A system) 14 and the INBOX (B system) 16 are INBOXs of one specification, but are realized by changing the connection destination and connection source on the backboard connected when the INBOX is mounted. That is, INBOX (A system) 1
4 from the POWERON B (A) -N1 / N2 signal terminal to the INBOX (B) POWERON A (B) -N
By connecting to the 1 / N2 signal terminal, INBOX (B
A signal for turning on / off the relays (B) 10 and 11 of the (system) 16 can be transmitted. Conversely, INBOX (B
In order for the system to be the leading INBOX, the INBOX (B
From the POWERB B (B) -N1 / N2 signal terminals of the INBOX (A) 14
(A) It may be connected to the -N1 / N2 signal terminal.

Next, a specific operation will be described. I
When the external input power supply 1 is input to the NBOX (A system) 14, the auxiliary power supply unit generates an auxiliary power supply used in the INBOX (A system) 14. Further, an auxiliary power OK signal is generated by the output of the auxiliary power, and it is recognized from this signal that the external input power of the A system is input.
Further, when the main switch 2 is turned on, a power supply OK signal is generated by the operation of the power failure detection circuit, and it is recognized that the main switch 2 is turned on. Since the INBOX (A system) 14 is a leading INBOX, when the external input power supply 1 is input and the main switch 2 is turned on, both the auxiliary power supply OK signal and the power supply OK signal become true values. , Relays (A) 8 and 9 are turned on. That is, the output signal of the AND gate to which the auxiliary power supply OK signal and the power supply OK signal are input becomes a true value, and this signal becomes one input of the gates of both I / F parts, and is input to the negative input of the gate of the I / F part. Since the POWER A (A) is open, DC GRG (ground potential) is input as a false value and both I / Fs
The output signal of the gate of the unit becomes a true value, whereby the relays (A) 8 and 9 are turned on. On the other hand, INBO
X (B system) 16 is a power supply OK for INBOX (A system) 14
Upon receiving the signal, the relays (B) 10 and 11 are turned off, and the stabilized power supply connected on the backboard is:
It operates by receiving an external input power from the INBOX (A system) 14. That is, since the power supply OK signal is input as a true value to the negative input of the gates of both the I / F sections of the INBOX (B system) 16, the output signals of the gates of both the I / F sections become false values. The relays (B) 10 and 11 are turned off.

FIG. 2 shows INBOX (A system) 14 and INBO.
The signal generation and signal flow of the X (B system) 16 and signal names for turning on / off the relays (A) 8 and 9 and the relays (B) 10 and 11 are shown. Relays (A) 8 and 9 are A
4, according to the signals of A6 and A7, and the relay (B) 1
On / off of 0 and 11 is controlled by the signals of B4, B6 and B7, and the on / off of the relay (A) and the relay (B) is controlled by the power supply OK signal of the INBOX (A system) which is the leading INBOX. Is done.

FIGS. 7A to 7C show the truth values of the signals shown in FIG. (A) to (c) show INBOX (A
3A and 3B show changes in signals according to changes in the external input power supply of INBOX (B system) and ON / OFF states of relays (A) and (B). In the embodiment, I
The power failure detection circuit in the NBOX changes the power supply OK signal from H (true value) to L (false value) when a power failure exceeding about 20 mSEC occurs.
If a power failure exceeding mSEC occurs, the auxiliary power
The signal is changed from H to L. (A) shows a case where both the external input power supplies 1 and 6 are input and both the main switches 2 and 7 are on. When an instantaneous power failure occurs when the INBOX (A system) is about 20 mSEC or more, the relay ( A) turns off and relay (B) turns on. Then IN
When the BOX (A system) returns, the relay (A) turns on again,
The relay (B) turns off. (B) shows a case where only the external input power supply 1 is input and only the main switch 2 is turned on. It is clear that the state is maintained regardless of the presence or absence of the external input power supply of the INBOX (B system). (A
The relays (A) 8 and 9 of the (system) hold the ON state.
(C) shows a case where only the external input power supply 6 is input and only the main switch 7 is turned on. When an external input power supply of INBOX (system A) is input, the relay (B) of INBOX (system B) is activated. The relay is turned off, and the relay (A) of the INBOX (A system) is turned on. That is, the leading INBOX has priority.

As described above, the INBOX (A system) and INBOX (B
System) can be switched safely. In addition, the simultaneous ON of the relay can be prevented by using the time difference between the ON time and the OFF time unique to the relay. Generally, the ON time is long and the OFF time is short. That is, for example, when the relay A is turned off and the relay B is turned on, the relay A is turned off in a short time, but since the relay B is turned on over a long time, the relay B is turned on until the relay A is turned off. And the relay A and the relay B do not turn on at the same time. When the relays are turned on at the same time, the external input power supplies 1 and 6 are short-circuited, causing a failure. Therefore, the simultaneous OFF may exist within the range that does not affect the system, but the simultaneous ON must not exist.

FIG. 3 shows the timing of switching the relay. AC OUT (A) and AC OUT (B) output INBOX (A system) and INBOX (B system) outputs 1 in the state of relay A and relay B, respectively. According to this state, the output is supplied to the stabilized power supply in the subsequent stage. You. Therefore, AC
OUT (A) and AC OUT (B) may have regions where supply is cut off in both systems, but they should not overlap. In both systems, the area where the supply is cut off is within the range of the withstand power at the time of the power failure of the subsequent stabilized power supply, and the operation is performed so that the output of the stabilized power supply is not affected at all. As mentioned above,
In any state of external input power supply, INBOX
The non-stop operation and the non-stop maintenance of the apparatus can be realized safely without turning on the relays of the (A) and INBOX (B) simultaneously without affecting the output of the stabilized power supply.

[0016]

According to the present invention, the present structure enables
External input power is supplied to the stabilized power supply via the leading INBOX. In addition, when the leading INBOX of the external input power supply is out of power, it switches to another INBOX side instantly, and has no effect on the output of the stabilized power supply at the subsequent stage, so that non-stop operation and maintenance can be performed, Further, there is an effect that the required number of the stabilized power supplies in the subsequent stage is greatly reduced, and the size and cost of the device can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing the flow of signal generation and control signals in an INBOX.

FIG. 3 is a time chart showing a timing of switching a relay.

FIG. 4 is a configuration block diagram of a conventional system.

FIG. 5 is a diagram for explaining an outline of the present invention.

FIG. 6 is another diagram for explaining the outline of the present invention.

FIG. 7 is a diagram showing truth values of signals in an INBOX according to the state of an external input power supply.

[Explanation of symbols]

 1, 6 External input power supply 2, 7 Main switch 3 Stabilized power supply 4 Load (hard disk etc.) 5 Control circuit 8, 9, 10, 11 Relay 14, 16 INBOX

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Masahiko Sato 2880 Kozu, Kozuhara-shi, Kanagawa Prefecture Storage Systems Division, Hitachi, Ltd. (72) Masahiro Hamaogi 2880 Kozu, Kozu, Odawara-shi, Kanagawa Hitachi, Ltd. In-house F term (reference) 5B011 DA01 FF02 GG01 HH02 5G015 FA08 GA06 HA15 KA03 KA05 5H410 BB04 CC03 CC05 DD02 EA38 EB40 FF03 FF22 LL04 LL11 LL18

Claims (5)

[Claims] 1. An input dual high-performance power supply system for duplicating an AC or DC external input power supply (hereinafter, referred to as an external input power supply) for supplying power to a device, wherein each of the external input power supply and the device is externally input. Each of the INBOXs is connected by a power supply switching circuit (hereinafter referred to as an INBOX), and each of the INBOXs is connected to the external input power supply and the device. A control means for outputting a control signal for turning off, and when only a control signal from the control means of the own INBOX is inputted, the switch means is turned on / off according to the control signal, and the control of the own INBOX is performed. When the control signal from the control unit and the control signal from the control unit of the other INBOX are input, the control signal from the other INBOX is turned on. Turn off the can switch means, other INB
An input dual high-performance power supply system comprising: switch control means for turning on / off the switch means in accordance with a control signal from its own INBOX when a control signal from the OX is off. 2. The dual-input high-performance power supply system according to claim 1, wherein a switch control means of an INBOX (hereinafter referred to as a first INBOX) connected to one of the external input power supplies has its own INB.
Only a control signal from the control unit of the OX is input, and a control signal line from the control unit of the first INBOX is connected to an INBOX (hereinafter, referred to as a second INBOX) connected to the other external input power supply. The switch control means of the second INBOX receives the control signal from the control means of the own INBOX and the control signal from the control means of the first INBOX. Means that the external input power supply and the device are connected by a first INBOX, the other external input power supply and the device are cut off by a second INBOX, and when one external input power supply is turned off, the external input power supply is And the device are cut off by the first INBOX, and the other external input power supply is connected to the device if the other external input power supply is turned on by the second INBOX, and the device is connected to the device. Input redundant high power system, wherein the input power is changed from one external input power supply to the other external input power supply. 3. The dual input high performance power supply system according to claim 2, wherein a control signal line from control means of said first INBOX is connected to said second INBOX, or said first INB.
An input dual high-performance power supply characterized in that an INBOX having the same specifications can be used by setting a connection of a control signal line from the control means of the second INBOX to the OX by a connecting means provided outside the INBOX. system. 4. The dual input high performance power supply system according to claim 1, wherein said INBOX has a plurality of said switch means. 5. The dual-input high-performance power supply system according to claim 1, wherein said switch means is constituted by a relay and a relay drive circuit, and said switching means is provided when said external input power supply is switched. A dual-input high-performance power supply system, characterized in that simultaneous connection of both external input power supplies to the device is prevented by a difference in ON / OFF operation time of the relay.