JPH0736575A - Feeder system - Google Patents

Abstract

PURPOSE:To provide plural active power source modules and a standby power source module, to maintain high reliability, and to reduce a production and operation cost. CONSTITUTION:The feeding voltage of a standby power source modules 5 is set as a voltage value less than the feeding voltages of active power source modules 1a-1c. In a normal operating state, the feeding outputs of both the active power source modules 1a-1c and the standby power source module 5 are turned to an 'on' state. In this state, loads 4a-4c are driven by the power feeding from the active power source modules 1a-1c having the feeding voltages higher than the dropping voltages of diodes 2a-2c and 7a-7c. When a fault occurs at any active power source module 1a-1c and the feeding voltage is less than the feeding voltage of the standby power source module 5, the corresponding loads 4a-4c are driven by the power feeding from the standby power source modules 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system, and more particularly to a power supply system in which a power supply unit is redundantly provided by providing a standby power supply module.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing an example of a conventional power feeding system. As shown in the figure, conventionally, for each power supply module 21a, power supply modules 21b having the same output voltage and output power are connected in parallel by diodes 22a and 22b, and by operating in parallel in this state, Even if one of the power supply modules 21a and 21b becomes inoperable, there is a highly reliable duplex power supply method in which the load 23 is continuously driven by power supply from the other power supply module connected in parallel.

[0003]

However, in the above-described conventional power supply system, the number of power supply modules required to drive the load is twice as many as the minimum number of power supply modules. Also, there is a problem that operating costs are required.

Therefore, an object of the present invention is to solve the above problems and to provide a power supply system which can maintain the high reliability as in the conventional case and can reduce the manufacturing and operating costs as compared with the conventional case. It is in.

[0005]

In order to achieve the above object, the power supply system of the present invention has a common recommended range of operating power supply voltage in a power supply system in which a standby power supply module is provided to redundantly configure a power supply unit. A plurality of loads, and a power supply voltage is set within the recommended range, and a plurality of working power supply modules that individually supply power to each of the loads during normal operation, and parallel to all the working power supply modules. The backup power supply module is connected, and the power supply voltage is set within the recommended range that is lower than the power supply voltage of all the active power supply modules by a predetermined limit voltage value or more.

The plurality of loads are connected to the working power supply module and the standby power supply module via diodes, respectively, and the power supply voltage of the standby power supply module is higher than that of the working power supply module. It is set within the recommended range that is lower than the forward drop voltage value.

[0007]

The operation based on the above configuration will be described.

According to the power supply system of the present invention, in a power supply system in which a redundant power supply module is provided by providing a standby power supply module, a plurality of loads having a common recommended range (allowable range) of operating power supply voltage and the recommended range are provided. The power supply voltage is set inside, a plurality of working power supply modules that individually supply power to each of the loads during normal operation, and all the working power supply modules are connected in parallel, and all of the working power supply modules are connected. The standby power supply module has a power supply voltage set within the recommended range that is lower than a power supply voltage by a predetermined limit voltage value or more.

Further, the plurality of loads are connected to the working power supply module and the standby power supply module through diodes, respectively, and the power supply voltage of the standby power supply module is higher than that of the working power supply module. Set it within the recommended range below the forward voltage drop value.

Therefore, when all the active power supply modules are operating normally, no power is supplied from the standby power supply module to the load. Then, when the power supply voltage of any active power supply module becomes lower than the power supply voltage of the standby power supply module, power supply from the standby power supply module to the corresponding load is started instead of the active power supply module. At this time, since the power supply voltage of the standby power supply module is set within the recommended range of the operating power supply voltage of the load as described above, the power supply fluctuation of the load converges within the recommended operating range and normal operation is continued.

Therefore, if the probability that two or more active power supply modules will simultaneously fail is extremely small,
Since only one standby power supply module can be used regardless of the number of active power supply modules, it is possible to maintain the same high reliability as the conventional one and reduce the manufacturing and operation costs as compared with the conventional one.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the power supply system of the present invention is used as a power source for an information processing apparatus will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing a first embodiment of the power feeding system of the present invention. In the present embodiment, the power supply method is shown in the case of a 3: 1 configuration in which the capacities of the active power supply modules and the loads are all the same, and three active power supply modules are backed up by one backup power supply module. In the figure, 1a to 1
c is a current power supply module, 2a to 2c are diodes for the current power supply modules 1a to 1c, 3a to 3c are power supply cables to respective loads, and 4a to 4c are current power supply modules 1
Loads that are individually fed from a to 1c to perform a predetermined operation,
Reference numeral 5 is a standby power supply module, 6a to 6c are power supply cables for the backup power supply module 5, 7a to 7c are diodes for the backup power supply module 5, and 8 is a current power supply module 1a to
ON / O of power supply output of 1c and standby power supply module 5
FF control circuit, 9 is diodes 2a-2c and 7a-
It is a power supply output voltage monitoring circuit for monitoring the anode voltage of 7c.

In FIG. 1, working power supply modules 1a to 1c are connected to loads 4a to 4c via power supply cables 3a to 3c and diodes 2a to 2c, respectively. Further, the standby power supply module 5 is connected in parallel via the diodes 7a to 7c and the power supply cables 6a to 6c. The output voltage and output power of the active power supply modules 1a to 1c and the standby power supply module 5 are equal to each other, and the diodes 2a to 2c and 7a to 7c are the same.
Of the power supply cables 3a to 3c
Of the power supply cables 6a to 6c are equal to each other.
Are equal to each other, and the loads 4a to 4c have equal capacitances. The recommended operating range of the power supply voltage of the loads 4a to 4c is 5V ± 5% (5 ± 0.25V), the diode 2
The voltage drop of a to 2c and 7a to 7c is 0.3V.

The power supply voltages of the active power supply modules 1a-1c and the standby power supply module 5 are set in advance by the following procedure. With the power supply outputs of the active power supply modules 1a to 1c turned on and the power supply output of the standby power supply module 5 turned off,
The power supply voltage at the loads 4a to 4c is 5.15V to 5.
Each working power supply module 1a so that it is within the range of 25V
Set a power supply voltage of ~ 1c. With the power supply output of the active power supply module 1a turned off and the power supply output of the standby power supply module 5 turned on, the load 4
The power supply voltage of the standby power supply module 5 is set so that the power supply voltage at a is within the range of 4.75V to 4.85V. With the power supply output of the current power supply module 1a turned on and the power supply output of the current power supply module 1b turned off, it is confirmed that the power supply voltage at the load 4b is within the range of 4.75V to 4.85V. With the power supply output of the current power supply module 1b turned on and the power supply output of the current power supply module 1c turned off, it is confirmed that the power supply voltage at the load 4c is within the range of 4.75V to 4.85V. From the above, the power supply voltage of the standby power supply module 5 is 0.3V to 0.
The voltage value is set to 5 V lower. That is, the loads 4a to 4
The voltage value indicating the recommended operating range of the power supply voltage of c must be larger than the voltage drop values of the diodes 2a to 2c and 7a to 7c.

In a normal operating state, the power supply outputs of both the active power supply modules 1a to 1c and the standby power supply module 5 are turned on. In this state, load 4
The a to 4c are driven by the power supply from the current power supply modules 1a to 1c having a power supply voltage higher than the voltage drop of the diode. Therefore, the loads 4a to 4c at this time
The power supply voltage at is 5.15V to 5.25V. When a failure occurs in the active power supply module 1a and the power supply voltage becomes lower than the power supply voltage of the standby power supply module 5, the load 4a is driven by the power supply from the standby power supply module 5. Therefore, the power supply voltage in the load 4a at this time is 4.75V to 4.85V. After recovering the failure of the active power supply module 1a, change the power supply voltage of the active power supply module 1a to 5.15.
When the load 5a is reset within the range of V to 5.25V, the load 5a is again driven by the power supply from the working power supply module 1a, and the normal operating state is restored.

The power output voltage monitoring circuit 9 includes a diode 2
a and 7a, diodes 2b and 7b, diodes 2c and 7
The anode voltages of c are always compared with each other. Then, when two or more active power supply modules fail simultaneously and the anode voltage of the active diodes 2a, 2b, 2c falls below the anode voltage of the spare diodes 7a, 7b, 7c, the standby power supply module 5 is powered. The output is turned off to protect the standby power supply module 5.

FIG. 2 is a diagram showing a second embodiment of the power feeding system of the present invention. The present embodiment shows a power supply method in the case of a 2: 1 configuration in which the capacity of each active power supply module and the load are different, and two active power supply modules are backed up by one spare power supply module. In the figure, 11a
11b are working power supply modules, 12a to 12b are diodes for working power supply modules 11a to 11b, and 13a.
˜13b is a power supply cable to each load, 14a to 14b are loads individually fed from each active power supply module 11a to 11b to perform a predetermined operation, 15 is a backup power supply module, and 16a to 16b are backup power supply module 15 Power supply cables, 17a to 17b are diodes for the standby power supply module 15, and 18 is a current power supply module 11a to 11
b / ON of power supply output of standby power supply module 15
The FF control circuit 19 is a power supply output voltage monitoring circuit that monitors the anode voltage of the diodes 12a to 12b and 17a to 17b.

In FIG. 2, load cables 14a-14b are provided with power supply cables 13a-13b and diodes 12a-1.
2b to the active power supply modules 11a to 11 respectively.
b is connected. Furthermore, the diodes 17a to 17
The auxiliary power supply module 15 is connected in parallel via the power supply cable 16b and the power supply cables 16a to 16b. The output voltages of the active power supply modules 11a-11b and the standby power supply module 15 are equal to each other, and the diodes 12a-
12b and 17a to 17b have the same voltage drop, power supply cables 13a to 13b have the same voltage drop, and power supply cables 16a to 16b have the same voltage drop. The output power of the active power supply module 11a is larger than the output power of the active power supply module 11b, and the capacity of the load 14a is larger than the capacity of the load 14b.
The recommended operating range of the power supply voltage of the loads 14a to 14b is 5V ± 5% (5 ± 0.25V), the diodes 12a and 1
7a has a voltage drop of 0.4V, diodes 12b and 1
The voltage drop of 7b is 0.3V.

The power supply voltages of the active power supply modules 11a-11b and the standby power supply module 15 are set in advance by the following procedure. The power supply output of the active power supply modules 11a to 11b is set to O.
N, with the power supply output of the standby power supply module 15 turned off, set the power supply voltage of each of the active power supply modules 11a to 11c so that the power supply voltage of the loads 14a to 14b is within the range of 5.20V to 5.25V, respectively. To do. With the power supply output of the active power supply module 11a turned off and the power supply output of the standby power supply module 15 turned on, the power supply voltage of the standby power supply module 15 is adjusted so that the power supply voltage in the load 14a falls within the range of 4.75V to 4.80V. To set. With the power supply output of the current power supply module 11a turned on and the power supply output of the current power supply module 11b turned off,
Confirm that the power supply voltage at the load 14b is within the range of 4.85V to 4.90V. From the above, the power supply voltage of the standby power supply module 15 is 0.4V to 0.5V higher than the power supply voltage of the active power supply module 11a.
V lower than the power supply voltage of the current power supply module 11b by 0.
It is set to a voltage value lower by 3V to 0.5V. That is, the voltage value indicating the recommended operating range of the power supply voltage of the load 14a is larger than the voltage drop value of the diodes 12a and 17a, and the voltage value indicating the recommended operating range of the power supply voltage of the load 14b is the voltage drop of the diodes 12b and 17b. It must be greater than the voltage value.

In a normal operating state, the power supply outputs of both the active power supply modules 11a and 11b and the standby power supply module 15 are turned on. In this state,
The loads 14a to 14b are driven by power supply from the active power supply modules 11a to 11b having a power supply voltage higher than the voltage drop of the diode. Therefore, the power supply voltage at the loads 14a to 14b at this time is 5.20V to 5.25V.
Becomes If a failure occurs in the active power supply module 11a,
When the power supply voltage becomes lower than the power supply voltage of the standby power supply module 15, the load 14a is driven by the power supply from the standby power supply module 15. Therefore, the power supply voltage at the load 14a at this time is 4.75V to 4.80V. When the power supply voltage of the active power supply module 11a is reset within the range of 5.20V to 5.25V after the failure of the active power supply module 11a is recovered, the load 14a is driven again by the power supply of the active power supply module 11a, and the normal operation is performed. Return to the state. When a failure occurs in the active power supply module 11b and the power supply voltage becomes lower than the power supply voltage of the standby power supply module 15, the load 14b causes the standby power supply module 1 to operate.
It will be driven by the power supply from 5. Therefore, the power supply voltage at the load 14b at this time is 4.85V-
It becomes 4.90V. After the failure of the working power supply module 11b is recovered, the power supply voltage of the working power supply module 11b is changed from 5.20V to 5.25V.
When the load 14b is reset within the range of V, the load 14b is again driven by the power supply of the working power supply module 11b, and the normal operating state is restored.

The power supply output voltage monitoring circuit 19 constantly compares the anode voltages of the diodes 12a and 17a and the diodes 12b and 17b, respectively. Then, the active power supply modules 11a and 11b simultaneously fail,
When the anode voltage of the diodes 2a, 2b on the working side falls below the anode voltage of the diodes 7a, 7b on the standby side, the power supply output of the standby power supply module 15 is turned off to protect the standby power supply module 15.

As described above, according to the first and second embodiments, when all the active power supply modules are operating normally, no power is supplied from the standby power supply module to the load. Then, when the power supply voltage of any active power supply module becomes lower than the power supply voltage of the standby power supply module, power supply from the standby power supply module to the corresponding load is started instead of the active power supply module. At this time, since the power supply voltage of the standby power supply module is set within the recommended range of the operating power supply voltage of the load, the power supply fluctuation of the load converges within the recommended operating range and the normal operation is continued.

Therefore, if the probability that two or more active power supply modules will simultaneously fail is extremely small,
Since only one standby power supply module can be used regardless of the number of active power supply modules, it is possible to maintain the same high reliability as the conventional one and reduce the manufacturing and operation costs as compared with the conventional one.

[0025]

As described above in detail, according to the power supply system of the present invention, in the power supply system in which the standby power supply module is provided and the power supply unit is redundantly configured, a plurality of recommended operating power supply voltage ranges are shared. Load, the power supply voltage is set within the recommended range, a plurality of working power supply modules that individually supply power to each of the loads at normal times, and are connected in parallel to all the working power supply modules,
The backup power supply module has a power supply voltage set within the recommended range that is lower than a power supply voltage of all the active power supply modules by a predetermined limit voltage value or more.

The plurality of loads are respectively connected to the working power supply module and the standby power supply module via diodes, and the power supply voltage of the backup power supply module is higher than that of the working power supply module by the diode. Set it within the recommended range below the forward voltage drop value.

Therefore, when all the active power supply modules are operating normally, no power is supplied from the standby power supply module to the load. Then, when the power supply voltage of any active power supply module becomes lower than the power supply voltage of the standby power supply module, power supply from the standby power supply module to the corresponding load is started instead of the active power supply module. At this time, since the power supply voltage of the standby power supply module is set within the recommended range of the operating power supply voltage of the load as described above, the power supply fluctuation of the load converges within the recommended operating range and normal operation is continued.

Therefore, if the probability that two or more active power supply modules will simultaneously fail is extremely small,
Since it is possible to use only one standby power supply module regardless of the number of active power supply modules, it is possible to maintain the same high reliability as the conventional one and reduce manufacturing and operation costs as compared with the conventional one. can get.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a power feeding system of the present invention.

FIG. 2 is a diagram showing a second embodiment of the power feeding system of the present invention.

FIG. 3 is a diagram showing an example of a conventional power feeding system.

[Explanation of symbols]

1a-1c, 11a-11b Working power supply module 2a-2c, 12a-12b Working power supply module diode 4a-4c, 14a-14b Load 5,15 Spare power supply module 7a-7c, 17a-17b Spare power supply module diode 8, 18 Power output ON / OFF control circuit 9, 19 Power output voltage monitoring circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Ikezawa 1 Horiyamashita, Hinoyamashita, Hadano, Kanagawa Prefecture (72) Inventor Hirotoshi Kato 1 Horiyamashita, Hadano, Kanagawa Prefectural Computer Electronics, Ltd. (72) Inventor, Fusao Aso, 810 Shimoimaizumi, Ebina, Kanagawa, Ltd., Office Systems Division, Hitachi, Ltd.

Claims (2)

[Claims] 1. In a power feeding system in which a redundant power supply module is provided by providing a standby power supply module, a plurality of loads having a common recommended range of operating power supply voltage and a power supply voltage are set within the recommended range. , A plurality of working power supply modules that individually supply power to each of the loads at normal times, and a predetermined limit voltage value that is connected in parallel to all the working power supply modules and is higher than the power supply voltage of all the working power supply modules. A power supply method comprising: the standby power supply module having a power supply voltage set within the recommended range which is lower than the above. 2. The plurality of loads are respectively connected to the working power supply module and the standby power supply module via diodes, and the power supply voltage of the standby power supply module is higher than the power supply voltage of the working power supply module. The power supply system according to claim 1, wherein the power supply system is set within the recommended range that is lower than the forward drop voltage value.