JPH10268983A - Parallel redundant power source system and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the high efficiency of AC input/DC power source at the time of normally operating a power source system by parallelly connecting plural DC power source so as to keeping the operation of a system without stopping the operation of a loading side even when a fault is generated at one of these power sources to stop output. SOLUTION: One of the DC power source 4 with a half output current capacity with respect to a load consumption current capacity is respectively connected to independent AC inputs 1 and 2. In addition, a DC power source with the half output current capacity of a load consumption current capacity is connected to respective AC inputs 1 and 2. The output of each DC power source 3 is connected to one wire to feed power for an electronic circuit group 5. Then, the feeding of power never stops even when a fault is generated at one place of an AC power source/DC power source. For example, when a fault is generated at AC input 1, a DC power source 4 connected to the AC input 2 feeds a power source of a half load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel redundant power supply system and apparatus for a power supply system connected in parallel used in a highly reliable computer (fault tolerant computer) and the like.

[0002]

2. Description of the Related Art In order to realize a highly reliable computer, two or more independent AC power supplies are connected as an embodiment, and a DC power supply capable of outputting all the current consumed by a load by one unit is used as an AC power supply. Connect one to each power supply
A method and apparatus for ORing the output of a C power supply and supplying DC power to a load.

Alternatively, (A / 2 * B) +1 (A = total load consumption current, B = one DC power supply output current) DC power supplies are applied to two or more independent AC power supplies. A system and an apparatus for connecting and ORing the outputs of all DC power supplies to supply DC power to a load.

[0004]

However, as in the previous embodiment, D
Even if a failure occurs in one C power supply, two power supplies capable of outputting all the current consumed by the load are connected in parallel in order to construct a power supply system that continuously outputs 100% of the load consumption current. When the AC power supply and the DC power supply are operating normally, each DC power supply outputs half of the current consumed by the load, and the DC power supply outputs less than half of the maximum output current. Generally DC
The efficiency of the power supply is maximum when the maximum output current of the power supply is being output, and when the output current decreases, the power supply efficiency also decreases. For this reason, when DC power is supplied in such a manner, the power efficiency of the device decreases, and the AC power supply current increases. (Decrease in power efficiency of the device) Further, if a failure occurs in one AC power supply or DC power supply, the output current and efficiency of the DC power supply become maximum because all loads concentrate on the remaining AC power supply or DC power supply. ,
The fluctuations of the AC power supply current and the DC output current are large between normal times and fault occurrences. (Increase in the AC input current fluctuation rate of the device) Further, in this embodiment, the output current of one DC power supply is equal to the current consumption of the load, and it is necessary to connect two of these power supplies in parallel. The power supply becomes twice the capacity. For this reason, the power supply volume increases and the mounting volume for the device increases. (Increase in volume of DC power supply) In addition, the AC protection circuit and the wiring of the AC system of the device must allow twice the load current capacity, and the capacity and size of the AC protection circuit and the wiring system become large. (AC protection circuit,
In addition, all of the maximum load current consumption flows in the output of each DC power supply in the event of a failure. Therefore, components that allow the maximum load current consumption are connected to the connection sections of the output stages of all DC power supplies. It has to be used, which is an adverse effect on downsizing of DC wiring and DC power supply. (Upsizing of DC power connection parts)

[0005]

[0007] Three DC power supplies that output half of the current consumption are connected in parallel. Two of these three units are power supplies that receive one AC power supply, and the other one receives two AC power supplies, and either of these two AC power supplies is selected by a switching circuit inside the power supply. And a DC power supply used as an AC current source. The connection between two independent AC inputs and three DC power supplies is
One power supply and one input of a DC power supply having an AC2 input with a built-in AC input switching circuit are connected. Similarly, the other AC power supply is connected to one DC power supply and the other input of the duplicated DC power supply. These three D
Connect two independent AC inputs to the AC power supply and connect three DC
A power supply system is constructed in which power supply outputs are OR-connected to supply DC power to a load.

By realizing this power supply configuration, the AC power supply current can be suppressed even during normal operation, a high-efficiency power supply system can be constructed, and the mounting volume can be reduced. AC power supply / D
Even if a failure occurs at one point of the C power supply, an increase in the AC input current can be suppressed more than before, while ensuring power supply corresponding to the current consumption of the load.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a load configuration having no power supply boundary, FIG. 2 shows a load configuration having a power supply boundary, and FIG. FIG. 4 shows an embodiment for improving the efficiency further than the embodiments shown in FIGS. 1 to 3.

In the case of the embodiment shown in FIG. 1, one DC power supply having half the output current capacity with respect to the load consumption current capacity of 4 is connected to independent AC inputs 1 and 2 respectively. An AC switching circuit for switching and selectively using the inputs 1 and 2 is built in, and a DC power supply 3 having an output current capacity half of the load current consumption capacity is connected to each of the AC inputs 1 and 2. The output of each DC power supply is connected to one wiring and supplies power to five electronic circuit groups.

With this configuration, even when a failure occurs in one of the AC power supply and the DC power supply, the power supply to the load does not stop. For example, even if a failure occurs in the AC input 1, the DC power supply 4 connected to the AC input 2 supplies half the current of the load, and the DC power supply 3 detects that the power supply from the AC input 1 has stopped. In order to switch the AC input from the AC input 1 to the AC input 2 inside the power supply, the power supply to the constant voltage circuit of the DC power supply 3 is performed without stopping, and as a result, the DC power supply 3
Supplies the other half of the current consumption to the load, and the two power supplies can supply 100% of the current consumption. Further, even if one of the DC power supplies fails, the remaining two DC power supplies supply 50% of the current consumption of the load to reduce the load current consumption by 100%.
% Can be supplied.

As described above, in this method, even if a failure occurs in any one of the power supply systems, the load consumption current is reduced by 100%.
% Power supply.

Further, by using the DC power supply 3 and adopting this configuration, it is possible to improve the DC power supply efficiency and the power efficiency of the apparatus when both the AC power supply and the DC power supply are operating normally. This is because if the efficiency of one DC power supply is 80% and the power supply system is normal, if the power supply system is normal in the previous connection method, the current consumption of the load is distributed to two DC power supplies and one DC power supply is used. Output current is only half of the maximum output current of the power supply. However, the current consumption in the control circuit portion of the DC power supply hardly decreases even when the output current of the power supply decreases, so that the efficiency of the DC power supply decreases to about 66.7% due to the decrease in the output current of the DC power supply. I do. However, in the embodiment of FIG. 1, the output current of one DC power supply may be half of the power supply of the previous case, and when a power supply of the same efficiency is used,
The amount of current consumed inside the power supply is small, and this method can improve the DC power supply efficiency to about 72.5%. Even when the DC power supply efficiency is the same when the power supply system is normal, the power efficiency is several%. As a result, the AC input current can be reduced more than before, and the power consumption of the device can be reduced. In addition, when a failure occurs at one point of the AC power supply / DC power supply, the maximum efficiency of the DC power supply is 80% in either method, and the fluctuation of the efficiency is improved by 5.8% in the present method, and the AC input of the device is improved. Current fluctuations can also be improved.

Further, in the previous method, the total power of the DC power supply connected to the load was twice as large as the power consumption of the load.
Components such as a heat sink can be reduced in size, and the volume of the DC power supply can be reduced. As a result, the mounting volume of the entire DC power supply can be reduced.

Further, the output current of the DC power supply outputs only half of the load current in both normal and fault situations.
The permissible current capacity of the connection components of the C output stage is also reduced to half.

In the case of FIG. 1, when a failure in the power supply system such as a load short circuit occurs in the electronic circuit group 5, the output of all the electronic circuit groups and the DC power supply is stopped. In order to improve this, the electronic circuit group of FIG. 1 is divided into two electronic circuit groups having independent DC power supply systems. The connection of the DC power supply in this case is shown in the embodiment of FIG.

In the case of the embodiment of FIG.
The 0 part is separated into two electronic circuit groups 7 and 8 having the same function, and power is supplied to each electronic circuit group from an independent / separated DC power supply. In this configuration (with a power supply boundary) the electronic circuit group 7
Are connected to three DC power supplies capable of outputting 50% of the current consumed by this circuit group (25% of the current consumption of all electronic circuit groups). The three DC power supplies are connected to two independent AC power supplies. One DC power supply 4 and one of the two AC inputs of the DC power supply 3 are connected to the AC1 side. Similarly, on the AC 2 side, one DC power supply 4 is connected to the remaining AC input of the DC power supply 3.

A power supply configuration and connection similar to those of the electronic circuit group 7 are made to the electronic circuit group 8.

By connecting a power supply to this configuration, each of the electronic circuit groups 7 and 8 can be connected to one of the AC inputs or one of the DC power supplies.
Even if a failure occurs at a location, power supply to the electronic circuit group 7 or the electronic circuit group 8 can be continued while satisfying all the improvements of the embodiment of FIG. Furthermore, even if a failure such as a power short-circuit occurs in the electronic circuit group 7, the failure is suppressed only to the electronic circuit group 7 and operates without affecting the electronic circuit group 8, so that half of the functions operate and the system stops. No obstacles.

FIG. 3 is a circuit diagram showing the 6 switching circuit of the embodiment shown in FIG.
This is a method of connecting to the outside of the power supply. In this method, three identical DC power supplies that output half of the load consumption current are connected in parallel to the load. However, one AC input of the DC power supply is connected to the output of the 11 switching circuit, and A is connected to the input of this switching circuit.
C1 and AC2 are input, AC1 or AC2 is selectively selected inside the switching circuit, and AC power is supplied to one DC power supply. In this method, if a failure occurs in one AC system, 1
The DC power supply connected to the first switching circuit is supplied with AC power from a normal AC input by the switching circuit. Since one of the remaining DC power supplies is connected to the normal AC input, it continues to supply the output current, and the two DC power supplies continue to output the load consumption current of the electronic circuit group 5. Even if a fault occurs in the eleven switching circuits, two of the three DC power supplies continue to output current and supply load consumption current.

By taking this configuration and connection form, all the improvements shown in FIG. 1 can be satisfied. Further, in this configuration, the DC power supply 3
The same table can be used and the maintenance and replacement work can be improved.

In the embodiment of FIG. 4, the output current of the DC power supply of FIGS. 1 and 2 is half of the total load consumption current by using a power supply less than that (less than 50%).
Even in this system, even if one AC system failure or one DC power supply failure occurs, switching of AC by the switching circuit 6 and the remaining D
100% of the load consumption current can be supplied by the C power supply, and the electronic circuit group 5 does not stop even if a failure occurs at one point in the power supply system. In this configuration, FIG.
However, when the DC power supply is constructed with four DC power supplies as shown in FIG. 4, the output current of one DC power supply may output 34% of the load consumption current, and has an AC switching circuit. D
Two C power supplies are required. Assuming that the efficiency of one DC power supply is 80% in this power supply configuration as in the embodiment of FIG.
Efficiency can be further improved compared to the configuration with three power supplies. This not only improves power efficiency, but also
The output current of one DC power supply can be further reduced, the volume of the DC power supply body can be further reduced, the restrictions on the mounting position are reduced, and the degree of freedom of the mounting position is increased.

However, in the case of the embodiment of FIG. 4, if A = total load current consumption and B = the maximum output current of one DC power supply,
The total number C of the C power supplies requires C = (A / B) +1, and among them, the total number D of the DC power supplies including three AC input switching circuits is D = C−2.

[0022]

As described above, 1) during normal operation of the power supply system, high efficiency of AC input / DC power supply can be obtained.

2) A highly efficient power supply system can be constructed even when an AC input / DC power supply fails.

3) Efficiency fluctuations of the power supply system can be suppressed even when the power supply system is operating normally or when a failure occurs in one of the AC inputs or one of the DC power supplies when the power supply system operates normally and when one of the DC power supplies fails.

4) The output power of one DC power supply is halved, so that the output power of the power supply system is 75% or less, and the power supply system can be downsized.

5) The output current (power) of one DC power supply can be reduced to half or less of the load consumption current, and the allowable current capacity of the DC output stage can be reduced (compact DC wiring system).

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a power supply system using the present invention.

FIG. 2 is a configuration diagram of a power supply system using the present invention together with a power supply boundary.

FIG. 3 is a configuration diagram of a power supply system using the present invention and provided with an AC switching circuit outside.

FIG. 4 is a configuration diagram of a power supply system for further improving power supply efficiency using the present invention.

[Explanation of symbols]

1 ... AC input 1, 2 ... AC
Input 2, 3, DC power supply with built-in AC input switching circuit,
4: DC power supply, 5: load circuit (electronic circuit group),
6: AC input switching circuit, 7: Electronic circuit group 1 having power supply boundary, 8 ... Electronic circuit group 2 having power supply boundary,
9: load circuit (electronic circuit group), 10: power supply boundary,
11 ... AC external switching circuit.

Claims (7)

[Claims] A plurality of DC power supplies are connected in parallel.
An apparatus having a system in which the system continues to operate without stopping the operation on the load side even if a failure occurs in one of the power supplies and the output stops, and a parallel redundant power supply system. 2. In a power supply system having two or more independent AC inputs, a plurality of DC power supplies are connected in parallel.
Even if a failure occurs in one of the C power supplies and the output stops, the system has a system that continues to operate the system without stopping the operation on the load side and a parallel redundant power supply system. 3. A plurality of Ds having two or more independent AC inputs.
In a power supply system in which C power supplies are connected in parallel, even if one AC input failure occurs, an apparatus having a method of continuing system operation without stopping operation on the load side and a device having a parallel redundant power supply method. 4. A plurality of DC power supplies are connected in parallel.
An apparatus having a system capable of replacing the power supply while maintaining system operation without stopping operation on the load side even when a failure occurs in one of the power supplies, and a parallel redundant power supply method. 5. An apparatus having a system in which a plurality of DC power supplies are connected in parallel to realize a high-efficiency output in a power supply system connected in parallel and redundant, and a parallel redundant power supply system. 6. An apparatus having a system in which a plurality of DC power supplies are connected in parallel to realize a small space / low cost in a power supply system connected in parallel and redundant, and a parallel redundant power supply system. 7. An apparatus having a method as a means for realizing a fault-tolerant function in an apparatus having a plurality of power supply boundaries and a parallel redundant power supply method.