JPH07163050A - Power system with n+1 redundancy structure and power supply - Google Patents

Abstract

PURPOSE:To prevent an overload for normal power supplies, by judging a failure in power system when two or more power supplies are out of order. CONSTITUTION:Each contact K1 to KN+1 of power supplies 101 to 10N+1 is connected in series with connection lines W1 to WN. While the same voltage (E) is applied to both ends of the serial circuit, each voltage applied to the connection lines W1 to WN are monitored. When the power supplies 101 and 102, for example, are out of order, corresponding contacts K1 and K2 are opened. In this case, the voltage (E) is not applied to the connection line W1 between the power supplies 101 and 102, and the abnormality is detected in monitor, and an overload to the remaining power supplies (103 to 10N+1 in this case) can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an N + 1 redundant power supply system and its power supply unit, and more particularly to N +
The present invention relates to a power supply system having an N + 1 redundant configuration in which one power supply unit is operated in parallel in an N + 1 redundant configuration to supply power to a common load, and a power supply unit thereof. In this type of power supply system, even if one power supply unit cannot be supplied with power (or has not been installed) during operation, there is no problem in supplying power to the entire system. However, when two or more power supply units cannot supply power, the remaining power supply units are overloaded. If left unattended, the life of the remaining power supply units will be shortened or a failure will occur. In the worst case, the power supply system Will go down. Therefore, it is desired to provide a power supply system capable of detecting the presence of an abnormality (or non-installation) in such two or more power supply units.

[0002]

2. Description of the Related Art FIG. 5 is a circuit diagram of a conventional power supply system having a 2 + 1 redundant configuration. In the figure, 20 _{1 to} 20 ₃ are power supply units, RL1 and RL2 are relays, K1 and K2 are their relay contacts, _Ta , T _b , T _e , and T _f are terminals provided on the outer surface of the power supply unit, PD is a photodiode, and DC.
Is a power supply circuit for generating a DC voltage of + V, CN is a connector for power feeding, and BB is a bus bar of a power feeding line.

This power supply system includes three power supply units 2
0 _{1 to} 20 ₃ are operated in parallel in a 2 + 1 redundant configuration to supply + V to a common load (not shown). Conventionally, a relay RL which opens the relay contacts K1 ₁ ~K1 ₃ corresponding with the detection of power failure ALM ₁ ~ALM ₃ in the self unit
1 of ₁ ～RL1 _3, wherein with connecting each contact K1 ₁ ~K1 ₃ in series connection line J _1, J _2, by applying a predetermined voltage E from the one end of the series circuit, and other Connection line J, which is the voltage applied to the other end developed in series
Through ₃ through J ₅ it was monitored by the relay RL2 ₁ ~RL2 ₃ of the power supply unit 20 ₁ to 20 _3.

According to this structure, the power supply unit 20₁
~ 20₃Is operating normally, power supply circuit DC₁~
DC₃Alarm detection signal ALM₁~ ALM₃Is inactive
It has been (opened), so relay RL1₁~ RL
1₃Relay contact K1₁~ K1 ₃Closed, relay RL
Two₁~ RL2₃A voltage E is applied to. In this state
Relay RL2₁~ RL2₃Relay contact K2₁~ K2₃
Is open, so the photodiode PD₁~ PD₃Is leaving
Doesn't illuminate, so you know that the power system is okay
It

However, the power supply unit 20₁~ 20₃What
If one of them loses power, the corresponding alarm detection
No. ALM₁, ALM₂Or ALM₃Energizing (GND signal
Supply) to relay contact K1₁, K1₂Or K1₃But
Open, relay RL2₁~ RL2₃Is marked with voltage E
Will not be added. As a result, relay contact K2₁~ K2 ₃
Closed, photodiode PD₁~ PD₃Emits light
Notify the abnormality of the power supply system to the outside. Power supply unit 2
0₁~ 20₃The same applies when any one of the
It

[0006]

As described above, in the conventional power supply system, even if any one of the power supply units fails (or is not installed), this is judged to be an abnormality of the power supply system and the result is notified to the outside. Was there. However, originally N + 1
The redundant power supply system has an original purpose of normally supplying power to the remaining N power supply units even if one of the N + 1 power supply units cannot supply power due to a failure or the like.

Therefore, when it is determined that the power supply system is abnormal despite the failure (or the non-installation) of one power supply unit as in the conventional case, the maintenance person causes confusion in managing and operating the power supply system. . Alternatively, although the photodiodes PD _{1 to} PD ₃ actually emit light due to the failure of two or more power supply units, the maintenance person arbitrarily determines that this is a failure of one power supply unit. In some cases, the operation may be continued as it is, and if such a condition continues, all power supply units may be damaged.

An object of the present invention is to provide a power supply system of N + 1 redundant configuration and its power supply unit capable of detecting an abnormal (including unmounted) state in any two or more power supply units.

[0009]

The above-mentioned problems can be solved by the structure shown in FIG. That is, the power supply system of the present invention (1) has N + 1 power supply units 1 including the switch circuit S that opens the contact K upon detection of a power failure in the self unit.
0, the contacts K are connected in series, the same voltage E is applied to both ends of the series circuit, and the voltage applied to each connection line W between the contacts K is monitored. By doing so, the presence of a fault in two or more power supply units 10 is detected.

The above problem can be solved by the configuration of FIG. That is, the power supply unit of the present invention (2) includes the first switch circuit S1 provided between the first and second terminals T _a and T _b.
The first contact K1 connected between the first and second terminals T _a and T _b upon detection of a power failure in the self unit.
And a second switch circuit S2 operated by a voltage applied to the third terminal T _c , wherein a predetermined voltage is applied to the input side of the second contact K2 and the third switch circuit S2 The second contact K2 is closed by applying a voltage of 0 V to the terminal T _c , and the light-emitting circuit P connected to the output side of the second contact K2 is the second contact. K
2 that emits light when closed.

The above problem can be solved by the configuration shown in FIG. That is, the power supply system of the present invention (3) is defined by claim 2.
Each of the first contacts K1 of the N + 1 power supply units 10 are connected in series, and the same voltage E is applied to both ends of the series circuit, and each connection between the first contacts K1 is performed. The presence of a fault in two or more power supply units 10 is detected by monitoring the voltage applied to the line W through each of the connection lines W developed at each third terminal T _c by a predetermined method. It is a thing.

[0012]

In the power supply system of the present invention (1) of FIG. 1,
Power supply unit 10₁-10_{N + 1}Switch circuit S₁~ S
_{N + 1}Power failure ALM in each unit₁~ ALM_{N +
1}Corresponding contact K by detecting₁~ K_{N + 1}Open up.
Therefore, each contact K₁~ K _{N + 1}Connection line W between₁~ W_Nso
Connected in series and identical at both ends of the series circuit
Voltage E of the₁~ W_NApplied to
The voltage being monitored.

According to this structure, the power supply unit 10 ₁
-10 _{N + 1} is operating normally, contacts K _1- K
_{Since N + 1} is closed, the voltage E is applied to the connection lines W _{1 to} W _N, and by monitoring these, the power supply system is determined to be normal. Alternatively, for example, the power supply unit 10
_When a failure occurs at ₁ , contact K ₁ opens. However, since the remaining contacts K _{2 to} K _{N + 1} are closed, the connection line W ₁ to
The voltage E is applied to W _N , and in this case also, the power supply system is not determined to be abnormal. Alternatively, for example, the power supply unit 10
Even failure ₂ has occurred, from one of the series circuit to the connection line W _1, and since the other from respective voltage E of the series circuit to the connection line W ₂ is applied, the power supply system is also in this case the abnormal Is not judged. The same applies hereinafter, and according to the present invention, even if a failure occurs in any one power supply unit 10, it is not determined that the power supply system is abnormal.

Actually, any one of the power supply units
There are cases where 10 is not installed, but in this case the corresponding contact
In the present invention, since the K is substantially open, the power supply unit
The state where 10 is not attached and the abnormal state can be handled equally. Next
For example, the power supply unit 10₁, 10₂Fails
And the corresponding contact K ₁, K₂Opens. In this case different
Power supply unit 10 that always occurs₁, 10₂Connection between
Continuation line W₁The voltage E is no longer applied to and is monitored
Therefore, the power supply system is determined to be abnormal. Or for example
Power supply unit 10₂, 10₃, 10_{N + 1}Fails
And the corresponding contact K₂, K₃, K_{N + 1}Opens. this
In case of abnormality, power supply unit 10₂, 10₃, 1
0_{N + 1}Connection line W between₂~ W_NVoltage E is applied to
The power supply system is still judged to be abnormal.
It The same applies hereinafter, and according to the present invention, any two or more
If a failure occurs in the power supply unit 10, the power supply system will be different.
Judged as always.

In the power supply unit 10 of the present invention (2) of FIG.
In addition, the first and second terminals T_a, T _bProvided between
The first switch circuit (that is, the alarm of the power supply unit)
(Detection circuit) S1 detects the power failure ALM in its own unit.
The output opens the first contact K1. Also, the third terminal T
_cThe second switch circuit (immediately
The power supply system alarm detection circuit) S2 is
A predetermined voltage (eg E) is applied to the input side of the second contact K2.
And the third terminal T_c0V voltage is applied to
As a result, the second contact K2 is closed. And
The light emitting circuit P connected to the output side of the second contact K2 is
Light is emitted by closing the contact K2.

Thus, the power supply unit 1 of the present invention (2)
In No. 0, each power supply unit 10 has all the functions necessary for constructing the power supply system of the N + 1 redundant configuration of the present invention (1), so there is no need to provide a special monitoring device outside. Moreover, since each power supply unit 10 has a common (same) configuration, it is possible to easily construct an arbitrary number of N + 1 redundant power supply systems simply by combining a plurality of power supply units 10.

That is, in the power supply system of the present invention (3) of FIG. 2, the first contacts K1 of the N + 1 power supply units 10 are connected in series, and the same voltage is applied to both ends of the series circuit. The voltage applied to each connection line W between the first contacts K1 is applied to each third terminal _Tc by a predetermined method, and the voltage is applied to each connection line W. The presence of a fault in two or more power supply units 10 is detected by monitoring the above.

Preferably, for example, the first and second power supply units are
10 for each₁, 10₂If,
2 power supply units 10₁, 10₂Connection line W between₁The first
Second and third power supply unit 10₂, 10₃The third end of each
Child T_cConnected to the second and third power supply units 10₂, 1
0₃Connection line W between₂The fourth power supply unit 10_FourThe third
Terminal T_c, And proceed in the same manner as below, to the N−1th,
Nth power supply unit 10 _N-1, 10_NConnection line W between_N-1
The N + 1th power supply unit 10_{N + 1}Third terminal T of_cTo
Connected, and the Nth and N + 1th power supply units 1
0_N, 10_{N + 1}Connection line W between_NThe first power supply unit 1
0₁Third terminal T of_cConnect to.

According to this structure, the power supply unit 10₁
-10_{N + 1}Is operating normally, contact K₁~ K
_{N + 1}Is closed, so the connecting line W₁~ W_NNo voltage
E is applied, which causes contact K2₁~ K2_{N + 1}Is open
Hold the state. That is, the power supply system in this case is normal
Therefore, the light emitting circuit P₁~ P_{N + 1}Does not emit light. or
Is, for example, the power supply unit 10₁And the obstacle (or not installed)
Contact point K1 ₁Opens. But the rest of the contacts
K1₂~ K1_{N + 1}Is closed, so connection line W₁~ W_N
Voltage E is applied to the
Is not determined. Alternatively, for example, the power supply unit 10₂so
Even if a failure (or not installed) occurs, the connecting wire W₁In series
From one side of the circuit and the connecting line W₂Is the other of the series circuit
Since the voltage E is applied from each of them, the power system
Mu is not considered abnormal. Hereinafter, the same applies to the present invention.
According to the report, a failure occurs in any one power supply unit 10.
Or even if one power supply unit 10 is not installed,
It is not determined that the stem is abnormal.

Next, for example, the power supply unit 10₁, 10₂
If a failure (or not installed) occurs at the contact K
1₁, K1₂Opens. In this case, the connecting line W₁There is no electricity
Pressure E is no longer applied, which causes contact K2₂, K2
₃Closes. Therefore, the power supply system in this case is abnormal
Therefore, the light emitting circuit P₂, P₃Emits light. In addition, this
In case of, the connecting wire W₁The wiring pattern of the
, Light emitting circuit P ₂, P₃The power supply unit is reversed by the light emission of
10₁, 10₂Can be presumed to be a disorder. Also,
Temporarily power supply unit 10₁Is an obstacle and the power supply unit 10
₂Even if is not installed, the light emitting circuit P₃Emits light.

Next, for example, the power supply units 10 ₂ to 10 _N
If a failure (or not installed) occurs in the corresponding contact K1 ₂
~ K1 _N opens. In this case, the voltage E is not applied to the connection lines W _{2 to} W _N−1 , and the corresponding contacts K2 _{N + 1} etc. are closed. Therefore, the power supply system in this case is also determined to be abnormal, and the light emitting circuit P _{N + 1} or the like emits light. The same applies hereinafter, and according to the present invention, any two or more power supply units 10
If a failure occurs or two or more power supply units 10 are not attached, it is determined that the power supply system is abnormal.

Further, preferably, each power supply unit 10 has a fourth terminal T _d connected to the output side of the second contact K2, and a common line C is provided between the fourth terminals T _{d of} each power supply unit 10.
Connect with B. In this way, all the light emitting circuits P emit light even when it is determined that the power supply system is abnormal at one place.

[0023]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals denote the same or corresponding parts throughout the drawings. FIG. 3 shows the embodiment 3 + 1.
In the circuit diagram of the power supply system redundant, 10 ₁ in FIG.
10 ₄ PSU embodiment, RL1, RL2 relay, K1, K2 those relay contact, T _a through T _e terminals provided on the outer surface of the power supply unit 10 (or connector, etc.), PD the photo Diode, DC is a power supply circuit that generates + V DC voltage, CN is a power supply connector, BB
Is the bus bar of the power supply line. Although not shown,
Preferably, a protective resistor is inserted in series on the anode side or the cathode side of the photodiode PD.

This power supply system includes four power supply units 1
0₁-10_FourAre operated in parallel with a 3 + 1 redundant configuration, and a common negative
+ V is supplied to the load (not shown). Power supply unit
10₁At relay RL1₁Drive voltage (eg
E) is added and the relay RL1₁Is power times
Road DC₁Abnormality detection signal AL from ₁Is deactivated (open)
If it is, its relay contact K1₁Closed
Abnormality detection signal AL₁Is energized (GND signal is supplied)
And relay contact K1₁Open up. Meanwhile, the relay RL2
₁Is the terminal T_CWhen more voltage E is applied, its relay connection
Point K2₁Open the terminal T_CIs floating
Relay contact K2₁Close. Other power supply uni
10₂-10_FourIs also the same.

Each such relay contact K1₁~ K1_Fourof
Connecting line W between₁~ W₃Connected in series with
Apply the same voltage E to both ends of the circuit, and
ー Contact K1₁~ K1_FourEach connecting line W between₁~ W₃Applied to
The power supply unit 10 is supplied with a predetermined voltage by a predetermined method.
₁-10_FourEach terminal T of_cEach of the connection lines W developed in ₁
~ W₃Via relay RL2₁~ RL2_FourSupervised by
Obstacles in two or more power supply units 10
Presence (including the case where the power supply unit 10 is not installed)
Put out.

Preferably, for example, the first power supply unit
10₁In that case, the power supply unit 10₁, 10₂Among
Connection line W₁Power supply unit 10 next to and next to₂as well as
10 ₃Terminal T_cConnected to the power supply unit 10₂, 10
₃Connection line W between₂Next to the power supply unit 10₃Skip one
Power supply unit 10_FourTerminal T_cConnect to, and
Last power supply unit 10₃, 10_FourConnection line W between₃Up to
First power supply unit 10 ₁Terminal T_cConnect to.

As the first power supply unit, 10 ₁
Any of 10 ₄ power supply units may be selected, and the direction in which the connection lines W _{1 to} W ₃ are expanded to the terminals T _c of each power supply unit may be reversed. According to this configuration, when the power supply units 10 ₁ to 10 ₄ are operating normally, the relay contacts K1 _{1 to} K1 ₄ are closed, so that the voltage E is applied to the connection lines W _{1 to} W _3. The relay contacts K2 _{1 to} K2 ₄ are maintained in the open state. That is, the power system in this case is determined to be normal, the photodiode PD ₁ -PD ₄ does not emit light.

Alternatively, for example, when a failure occurs in the power supply unit 10 ₁ , the relay contact K1 ₁ is opened. However, the remaining relay contacts K1 ₂ ~K1 ₄ voltage E is applied to the connection line W ₁ to _W-3 since the closed, power systems in this case not determined to be abnormal. Alternatively, even if a failure occurs in the power supply unit 10 ₂ , for example, the voltage E is applied to the connection line W _{1 from one} of the series circuits and to the connection line W ₂ from the other of the series circuit. However, the power supply system is not judged to be abnormal. The same applies hereinafter, and according to the present embodiment, even if a failure occurs in any one power supply unit 10, it is not determined that the power supply system is abnormal. The same is true even if one power supply unit 10 is not installed.

Next, for example, the power supply units 10 ₁ and 10 ₂
If a failure occurs in the relay, the corresponding relay contacts K1 ₁ , K1 ₂
Opens. In this case, the voltage E is not applied to the connection line W _1, and the relay contacts K2 ₂ and K2 ₃ are closed. Therefore, the power system in this case is determined to be abnormal, it emits light photodiode PD ₁ -PD _4. Next, for example, when a failure occurs in the power supply units 10 ₂ and 10 ₃ , the corresponding relay contacts K1 _{2 to} K1 ₃ are opened. This case is not the voltage E is applied to the connection line W _2, relay contacts K2 ₄ is closed. Therefore, the power supply system in this case is also determined to be abnormal, and the photodiodes PD _{1 to} PD
₄ emits light. The same applies to the following, and according to the present embodiment, when a failure occurs in any two or more power supply units 10, it is determined that the power supply system is abnormal. The same applies even if the power supply unit 10 is not mounted.

FIG. 4 is a diagram for explaining a power supply system of another embodiment. FIG. 4A shows a power supply system having a 1 + 1 redundant configuration. In this case, the power supply units 10 ₁ , 1
0 power unit 10 a connection line W ₁ on both sides between _{2 1} and 1
0 _{2 respectively} connected to the terminals T _c . 2B in FIG.
₁ shows a redundant power supply system, in this case connecting the connection line W ₁ between the power supply units 10 ₁ and 10 _{2 to the} terminals T _c of the adjacent power supply units 10 ₂ and 10 _{3 respectively} , and , The connection line W ₂ between the power supply units 10 ₂ and 10 ₃ is connected to the terminal T _c of the power supply unit 10 ₁ .

FIG. 4C shows a general N + 1 redundant power supply system. In this case, for example, when the power supply unit 10 ₁ is the first power supply unit, the power supply units 10 ₁ and 10 _{2 are connected to} each other. Connect the connecting wire W ₁ of the power supply unit 1
0 ₂ and 10 ₃ are connected to the terminals T _c , respectively, and the power supply unit 1
Connect the connecting wire W ₂ between 0 ₂ and 10 _{3 to} the terminal T _c of the power supply unit 10 ₄ , and proceed in the same manner as described below.
The connection line W _N-1 between 0 _N-1 and 10 _N is connected to the terminal T _c of the last power supply unit 10 _{N + 1} , and the power supply unit 1
Connect the connecting wire W _N between 0 _N and 10 _{N + 1} to the first power supply unit 1
It is connected to its terminal T _c so as to return to 0 ₁ .

[0032] In the above embodiment showed the method of respectively monitored by the relay RL2 ₁ ~RL2 _{N + 1} with the voltages of the connection lines W ₁ to _W-N to each of the power supply units 10 ₁ ~10 _{N + 1} which Not limited to For example, power supply units 10 ₁ to 10
_A common monitoring means may be provided outside _{N + 1} . Further, in the above-described embodiment, the circuit including the relay RL and the relay contact K is used as the switch circuit S, but the switch circuit S may be configured by any circuit.

Further, in the above embodiment, a specific example of developing the connection lines W _{1 to} W _N to the terminals T _c of each power supply unit 10 is shown, but the developing method is not limited to that of the above embodiment.
Further, in the above embodiment, the photodiodes PD _{1 to} P _{1 to} P ₁ are connected via the common line CB by connecting any one of the relay contacts K2.
Although D ₄ is turned on, the outputs of the power supply circuits DC _{1 to} DC ₄ may be turned off together.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various changes in configuration and combination can be made without departing from the spirit of the present invention.

[0035]

As described above, according to the present invention, N + 1
Since it is possible to detect the presence of an abnormality (including the non-installation of the power supply unit) in any two or more power supply units in the redundant power supply system, it is possible to effectively avoid the situation where the remaining power supply units are overloaded. Therefore, a power supply system that is easy to operate and highly reliable can be provided.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a principle configuration diagram of the present invention.

FIG. 3 is a circuit diagram of a power supply system having a 3 + 1 redundant configuration according to the embodiment.

FIG. 4 is a diagram illustrating a power supply system according to another embodiment.

FIG. 5 is a circuit diagram of a conventional 2 + 1 redundant configuration power supply system.

[Explanation of symbols]

 10 power supply unit S switch circuit K contact W connection line T terminal P light emitting circuit ALM fault detection signal CB common line

Claims (5)

[Claims] 1. N + 1 comprising a switch circuit (S) for opening a contact (K) upon detection of a power failure in its own unit.
The respective contacts (K) of the individual power supply units (10) are connected in series, the same voltage (E) is applied to both ends of the series circuit, and the contacts (K) are connected between the contacts (K). 2 by monitoring the voltage applied to each connection line (W)
A power supply system having an N + 1 redundant configuration, characterized by detecting the presence of a failure in the above power supply unit (10). 2. A first switch circuit (S1) provided between first and second terminals (T _a , T _b ), wherein the first and second switch circuits (S1) detect the power failure in the self unit. in the terminal (T _a, T _b) and the first one of which opens the contact (K1) connected between the second switch circuit (S2) operated by a third voltage applied to the terminal (T _c) Therefore, a predetermined voltage is applied to the input side of the second contact (K2), and a voltage of 0V is applied to the third terminal ( _Tc ), so that the second contact
And a light emitting circuit (P) connected to the output side of the second contact (K2), which emits light when the second contact (K2) is closed. And a power supply unit. 3. N + 1 power supply units (1) according to claim 2.
0) connecting each first contact (K1) in series,
Applying the same voltage (E) to both ends of the series circuit,
The voltage applied to each connection line (W) between each of the first contacts (K1) is expanded to each third terminal ( _Tc ) by a predetermined method. ), The presence of a fault in two or more power supply units (10) is detected by monitoring the power supply system of (N + 1) redundant configuration. 4. The first and second power supply units (10 ₁ , 1)
0 ₂₎ connecting line between (W _1), respectively the second, connected to the third terminal of the third power supply unit (10 _2, 10 ₃₎ (T _c), second, third power source units ( 10 _2, 10 ₃₎ connecting line between (W ₂₎ third and fourth power supply unit ₍₁₀₄₎
Connected to the terminal (T _c ), and similarly in the following, the N−1th,
The connection line (W _N-1 ) between the Nth power supply unit (10 _N-1 , 10 _N ) is connected to the third terminal (T _c ) of the _{N + 1th} power supply unit (10 _{N + 1} ), and , Connection line (W _N ) between the _Nth and _{N + 1th} power supply units (10 _N , 10 _{N + 1} ).
To the third terminal (T _c ) of the first power supply unit (10 ₁ ).
The power supply system according to claim 3, wherein the power supply system has an N + 1 redundant configuration. Wherein each power supply unit (10) comprises a fourth terminal of the (T _d) which is connected to the output side of the second contact (K2), the fourth terminal (T _d of each power supply unit (10) 4. The power supply system of N + 1 redundant configuration according to claim 3, wherein the power supply system is connected by a common line (CB).