JPH078100B2 - Power control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a power supply control system for controlling a power supply composed of a plurality of DC power supply circuits in order to consume a large amount of power, and particularly to a power supply control for a large computer. Regarding the scheme.

[Conventional technology]

FIG. 2 is a block diagram showing a conventional power supply control method, in which n DC power supply circuits d ₁ ′ to d _n ′ have their outputs connected in common and supplied to a load (not shown). Each of the DC power supply circuits d ₁ ′ to d _n ′ has an overvoltage signal OV ₁ ′ to OV _n ′ when the output is overvoltage.
Is output and when the output is undervoltage, the undervoltage signal UV ₁ ′
'Outputs, insufficient current signal UC ₁ when the output is insufficient current' ～UV _n outputs a to UC _n '. In addition, the voltage stabilization control circuit
d ₀ outputs the overvoltage signal OV when the common output of the DC power supply circuits d ₁ ′ to d _n ′ is overvoltage, and outputs the undervoltage signal UV when it is undervoltage.

Undercurrent signals UC ₁ ′ to UC _n ′ are input to the AND circuit 1,
The overvoltage signals OV ₁ ′ to OV _n ′ are input to the OR circuit 2, the undervoltage signals UV ₁ ′ to UV _n ′ are input to the OR circuit 3, and the output of the OR circuit 2 and the overvoltage signal OV are input to the AND circuit 4. Is
The output of the OR circuit 3 and the undervoltage signal UV are input to the AND circuit 5. Signal A, which is the logical sum of the outputs of AND circuits 1, 4, and 5.
When LM ′ is output from the OR circuit 6, DC power supply circuit d ₁ ′
~ D _n ′ is cut off and the output is made zero.

That DC power supply circuit at least one output of d ₁ '~d _n' is an overvoltage, and the DC power supply circuit d ₁ '~d _n' common output signal ALM 'is output when becomes overvoltage DC power supply circuit d ₁ ′ to d _n ′ are blocked.

Also, when one of the output at least of the DC power supply circuit d ₁ 'to d _n' is insufficient voltage and the common output of the DC power supply circuit d ₁ 'to d _n' becomes undervoltage, or DC power source circuit d ₁ '~
Signal AL even when all outputs of d _n ′ become undercurrent
M 'is output DC power supply circuit d _1' ~d _n 'is blocked.

[Problems to be solved by the invention]

Each of the DC power supply circuits d ₁ ′ to d _n ′ has the following drawbacks because it is shut off when the output becomes an overcurrent.

When the DC power supply circuits d ₁ ′ to d _n ′ have no redundancy with respect to the load, if even one of the DC power supply circuits d ₁ ′ to d _n ′ becomes an overcurrent, immediately all the DC power supply circuits d 1 ₁ 'to d _n' is cut off, the load will stop.

For example, when the DC power supply circuit d ₁ ′ is cut off due to an overcurrent, the remaining DC power supply circuits d ₂ ′ to d _n ′ try to supply current to the load, but originally there is no redundancy and it is required by the load. Since the capacity of the DC power supply circuit to be supplied is smaller than the current capacity, one or more of the DC power supply circuits d ₂ ′ to d _n ′ are further cut off due to overcurrent. By repeating this, all DC power supply circuits d ₂ ′ to d _n ′ are cut off immediately.

Even if one of the DC power supply circuits d ₁ ′ to d _n ′ is cut off, the remaining DC power supply circuits can supply sufficient current to the load without causing overcurrent, and the DC power supply circuits d ₁ ′ to d _n Redundancy can be provided by deciding the number of ′. In this case, when the setting of the overcurrent of each DC power supply circuit d ₁ ′ to d _n ′ is set to be equal to or higher than the rated current value (generally, the set value of the overcurrent is determined with a margin larger than the rated current value. )
When the DC power supply circuits d ₁ ′ to d _n ′ have no redundancy with respect to the load at the rated current, for example, if the DC power supply circuit d ₁ ′ is cut off, the other DC power supply circuits d ₂ ′ to d 'I can continue to supply current to the load, the DC power supply circuit d _{2' n} ~
In d _n ′, there is a drawback in that the output current exceeds the rating and the reliability of the power source is adversely affected.

Furthermore the DC power supply circuit d ₁ as well have a redundancy to the load current in any of the set value and the rated current value of the overcurrent DC decide the number of 'to d _n' power circuit d ₁ 'to d _n' Even if one of them is cut off, the current can be continuously supplied to the load so that the output current of any of the remaining DC power supply circuits is within the rating.

However, even in this case, if the overcurrent is set to the rated current or higher, the output current of any of the DC power supply circuits d ₁ ′ to d _n ′ will continue to be supplied to the load with the output current higher than the rated value. Cannot be reliably prevented.

For example, even if the DC power supply circuit d ₁ ′ is cut off by an overcurrent, the output current of the remaining DC power supply circuits d ₂ ′ to d _n ′ is in the range of both the set value of overcurrent and the rated current. Current is supplied to the load, but the DC power supply circuit d ₂ ′ is cut off due to overcurrent and the remaining DC power supply circuits d ₃ ′ to d _n ′.
When the output current of is within the overcurrent, the current continues to be supplied to the load, but it may exceed the rated current. In this case, if the DC power supply circuits d ₁ ′ and d ₂ ′ are cut off, the current will be continuously supplied beyond the rating, which will adversely affect the reliability of the power supply.

[Means for solving problems]

In the power supply control method of the present invention, each output is commonly connected to a load, and even when one of them is cut off, the other output current values are set to a plurality of units whose number is set below the rated value. DC power supply circuit, warning means for outputting a warning signal when one output of the plurality of DC power supply circuits is overcurrent or undercurrent, and two or more outputs of the plurality of DC power supply circuits When a current or an insufficient current is present, it is configured to include a cutoff unit that cuts off the plurality of DC power supply circuits.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which the n DC power supply circuits d _{1 to} d _n are connected in common and supply the outputs. DC power supply circuit d ₁ to d _n, respectively, and outputs an overvoltage signal OV ₁ ~OV _n when the output is overvoltage, and outputs the undervoltage signal UV ₁ ~UV _n when the output is insufficient voltage, the output is over outputting an overcurrent signal OC ₁ ~OC _n when a current and outputs the insufficient current signal UC ₁ to UC _n when the output is under current. The voltage stabilization control circuit d ₀ outputs the overvoltage signal OV when the common output of the DC power supply circuits d _{1 to} d _n is overvoltage, and outputs the undervoltage signal UV when it is undervoltage. DC power supply circuit d _{1 to} d _n
Overcurrent signals OC _{1 to} OC _n and undercurrent signals
OR circuit a ₁ ~a _n to enter the UC ₁ to UC _n each are provided.

Even if one of the DC power supply circuits d _{1 to} d _n is cut off,
DC power supply circuit so that the remaining (n-1) DC power supply circuits can satisfy the current required by the load with the output current within the rating
setting the number n of d ₁ ~d _n.

The overvoltage coincidence detection circuit H ₁ has an OR circuit 12 that inputs the overvoltage signals OV _{1 to} OV _n, and outputs the output of the OR circuit 12 and a signal from the AND circuit 14 that inputs the overvoltage signal OV.

The undervoltage match detection circuit H ₂ has an OR circuit 13 that inputs the undervoltage signals UV _{1 to} UV _n , and outputs a signal from the AND circuit 15 that inputs the output of the OR circuit 13 and the undervoltage signal UV. .

Logic circuit G ₁ includes an AND circuit C ₁ for inputting the output of the OR circuit a _1, a _2, an exclusive OR circuits S ₁ to enter the output of the OR circuit a _1, a _2. Each of the logic circuits G _{2 to} G _n −1 includes an AND circuit C ₂ and an exclusive OR circuit S ₂ , ..., And circuit C _n −.
1 and an exclusive OR circuit S _n -1, and AND circuits C _{2 to} C _n
-1 is the output of the exclusive OR circuit S ₁ and the OR circuit a ₃
, ..., The output of the exclusive OR circuit S _n -2 and the output of the OR circuit a _n are input, and the outputs of the exclusive OR circuits S _{2 to} S _n -1 exclusive OR circuit S ₁ are input. The output of the OR circuit a ₃ , ..., The output of the exclusive OR circuit S _n -2 and the output of the OR circuit a _n are input.

The OR circuit 19 inputs the outputs of the AND circuits C _{1 to} C _n -1.
The OR circuit 16 inputs the outputs of the OR circuit 19 and AND circuits 14 and 15, and outputs a signal ALM. The AND circuit 18 inputs the output of the exclusive OR circuit S _n -1 and the output of the OR circuit 19 via the inverter 17, and outputs the signal W. Signal ALM
Is output, the DC power supply circuits d _{1 to} d _n are shut off. The signal W is a warning signal.

DC power supply circuit d ₁ at least one output overvoltage of the to d _n, and at least one of time or the DC power supply circuit d ₁ to d _n common output of the DC power supply circuit d ₁ to d _n is overvoltage 1 When the two outputs are undervoltage and the common output of the DC power supply circuits d _{1 to} d _n is undervoltage, the signal ALM is sent through the overvoltage match detection circuit H ₁ or the undervoltage match detection circuit H ₂ and the OR circuit 16.
Is output and the DC power supply circuits d _{1 to} d _n are shut off.

When at least two outputs of the DC power supply circuits d _{1 to} d _n are overcurrent or undercurrent and signals are output from two or more of the OR circuits a _{1 to} a _n , the AND circuits C _{1 to} C _n − A signal is output from any one of them, a signal ALM is output through the OR circuits 19 and 16, and the DC power supply circuits d _{1 to} d _n are cut off.

When only one of the DC power supply circuits d _{1 to} d _n is overcurrent or undercurrent and a signal is output from _{one of} the OR circuits a ₁ to _n , the exclusive OR circuit S _n -1 A signal is output, and at this time, the signal of the OR circuit 19 is not output, so the signal of the inverter 17 is output and the signal W is output from the AND circuit 18. Further, at this time, the signal ALM is not output, and the DC power supply circuits d _{1 to} d _n other than those having an overcurrent or an undercurrent are not cut off.

〔The invention's effect〕

As described above, according to the present invention, when one of a plurality of DC power supply circuits having respective outputs commonly connected has an overcurrent or an undercurrent, a warning signal is continuously supplied to the load. Since it is possible to know the state of overcurrent and the like, it is possible to take appropriate measures such as eliminating the failure without stopping the load. Also, when two or more DC power supply circuits become overcurrent or undercurrent, all DC power supply circuits are disconnected, so that the DC power supply circuits do not operate beyond their ratings and the reliability of the DC power supply circuits is improved. Is effective.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional power supply control system. d _{1 to} d _n , d ₁ ′ to d _n ′ ... DC power supply circuit, d ₀ ′, d ₀ ′ ……
Voltage stabilizer, OV, OV _{1 to} OV _n , OV ₁ ′, OV _n ′ ... Overvoltage signal, UV, UV _{1 to} UV _n , UV ₁ ′ to UV _n ′ ... Undervoltage signal, OC _{1 to} OC _n …… Overcurrent signal, UC _{1 to} UC _n , UC ₁ ′ to UC _n ′
…… Undercurrent signal, H ₁ …… Overvoltage coincidence detection circuit, H ₂ …
... Circuit for undervoltage detection.

Claims (1)

[Claims] 1. A plurality of DC power supplies whose number is set so that each output is commonly connected to a load, and when one of them is cut off, the other output current values remain below the rated value. A circuit, warning means for outputting a warning signal when the output of one of the plurality of DC power supply circuits is overcurrent or undercurrent, and the output of two or more of the plurality of DC power supply circuits is overcurrent or A power supply control method comprising: a cutoff unit that cuts off the plurality of DC power supply circuits when the current is insufficient.