JPH05260654A - Dual power supply equipment - Google Patents

Abstract

PURPOSE:To suppress a current during a short circuit at the load side without deteriorating the reliability by mutually monitoring the state of the other power supply unit by the power supply control of each power supply unit and also, based on the result, by changing a set current value for an overcurrent protection circuit. CONSTITUTION:If the second power supply unit 2 becomes abnormal, a high-level signal from power supply state output section 231 of a power control section 23 is input through a signal line 42 to the setting change-over indication section 132 of a power supply control section 13 of the first power supply unit 1. Then, by the instruction from the setting change-over instructing section 132, a change- over drive relay 123 of an overcurrent protection circuit 12 is driven, and change-over switches 123 and 124 are switched from a fuse 121 side for 10A to a fuse 122 side for 20A. And when the power supply unit 1 begins to operate normally, a low-level signal from a power supply state output section 131 is sent to a setting change-over instructing section 232 through the second power supply unit 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual power supply device in which a power supply unit based on overcurrent control is dualized.

[0002]

2. Description of the Related Art Systems such as fault tolerant systems that require high reliability operate non-stop for 24 hours. Therefore, a power supply unit, which is a key component of the system, is required to have high fault tolerance.

As a means for realizing a highly reliable power supply system, there is known a system in which the outputs of a plurality of power supply devices are duplicated by diode-or connection.

FIG. 2 is a block diagram showing an example of the configuration of a conventional dual power supply device, where 81 is a first power supply unit,
Reference numeral 82 is a second power supply unit, and 83 is a common unit. First
The second power supply units 81 and 82 include power supply units 811 and 821 and overcurrent protection circuits 812 and 822, respectively. The power supply units 811 and 821 have a function of converting an AC voltage into a DC voltage, and the output currents of the first and second power supply units 81 and 82 of the overcurrent protection circuits 812 and 822 do not flow beyond a set current value. It is a circuit that protects. The common part 83 is for connecting the DC output of each of the first and second power supply units 81 and 82 to the load side (not shown) by diode OR connection and has diodes 831 and 832.

By duplicating in this way, the first
When the power supply unit 81 and the second power supply unit 82 are operated in parallel, even if one of them fails, the power can be supplied from the other power supply unit, and the reliability of the entire power supply device is improved. Can be improved. Also, the first,
Since the second power supply units 81 and 82 are connected in the common portion 83 via the diodes 831 and 832, the defective power supply unit is removed from the common portion 83, the power supply unit is repaired, and then connected to the common portion 83. By doing so, maintenance can be performed without affecting the load side.
For this reason, the first and second power supply units have enough capacity to supply power to the entire system even when they are operated by one unit.

For example, when the load consumes 20 A, the first
Also, each of the second power supply units 81 and 82 has a capacity of 20 A. When these units are operated in parallel, a current of 20 A + 20 A = 40 A can flow in the entire power supply device. In such parallel operation, if the load side is short-circuited, a maximum current of 40 A flows, causing smoke,
It may lead to serious accidents such as ignition. In order to avoid this, as shown in FIG. 3, if an overcurrent protection circuit 933 is mounted on the common unit 93 and the set value of the overcurrent protection circuit 933 is set to 20 A, even if the load side is short-circuited. The breaking current value can be suppressed to 20A.

[0007]

However, in the dual power supply device having the above configuration, the current value when the load side is short-circuited can be suppressed, but since the overcurrent protection circuit 933 is mounted in the common portion 93, Overcurrent protection circuit 93
If 3 fails, there is a drawback in that the system immediately goes down and the reliability of the entire system deteriorates.

The problem to be solved by the present invention is to provide a dual power supply device capable of suppressing the current value of the power supply device flowing when the load side is short-circuited, without lowering the reliability of the system described above. Especially.

[0009]

In order to solve the above problems, a dual power supply device according to the present invention is provided with a power supply unit and an overcurrent protection circuit for protecting an output current of the power supply unit from flowing beyond a set current value. And a power supply unit, wherein each power supply unit is further provided with a power supply control unit, and each power supply control unit monitors the normality / abnormality of the power supply unit in which it is installed. If the result of the monitoring from the power supply status output unit that outputs the result to the power supply control unit of the other power supply unit and the power supply status output unit of the other power supply unit is abnormal, The overcurrent protection circuit is provided with a setting switching instructing section for instructing to change the set current value.

[0010]

The normality / abnormality of each power supply unit is monitored by the power supply status output unit of the power supply control unit provided in the power supply unit. The respective monitoring results are connected to the setting switching instructing unit provided in the power control units of the other power supply units.
Therefore, each power supply control unit monitors the operating state of the other power supply unit via the power supply control unit in the other power supply unit. When both power supply units are operating normally, the set current value of each overcurrent protection circuit is set to 10A, which is 1/2 of the predetermined value (for example, the load side capacity 20A), and the load is shared by each power supply unit. is doing. When one power supply control unit inputs an abnormality of the other power supply unit, the overcurrent protection circuit in the one power supply unit sets the set current value according to the instruction of the setting switching instruction unit of the one power supply control unit. It is set to 20A which is twice the predetermined value. In this way
When one unit is in operation, one of the power supply units can supply power in response to the capacity on the load side. When operating two units in parallel, the maximum current supplied by each power supply unit was set to 10 A, and the load side was short-circuited. When the current is 10 + 10 =
It can be suppressed to 20A.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the dual power supply device according to the present invention will be described below. FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 1 is a first power supply unit, 2 is a second power supply unit, and 3 is a common part. The first and second power supply units 1 and 2 respectively include power supply units 11 and 21, overcurrent protection circuits 12 and 22, and power supply control units 13 and 23. The power supply units 11 and 21 have a function of converting an AC voltage into a DC voltage, and the output currents of the first and second power supply units 1 and 2 of the overcurrent protection circuits 12 and 22 flow above a set current value. It is a circuit that protects it from being protected. The common unit 3 is for connecting the DC output of each of the first and second power supply units 1 and 2 to a diode OR connection and supplying it to the load side (not shown), and has diodes 31 and 32.

Each overcurrent protection circuit 12 includes, for example, fuses 121 and 122, changeover switches 123 and 124, and a changeover drive relay 125. The fuse 121 is for low current, the fuse 122 is for high current, and one of them is inserted in series with the output of the power supply unit 11 by the changeover switches 123 and 124 to protect against overcurrent. The changeover switches 123 and 124 are driven by a changeover drive relay 125. The switching drive relay 125 is the setting switching unit 13 in the power supply control unit 13 provided in the same power supply unit 1.
By the instruction of 2, it is possible to switch according to two kinds of set current values. The switching drive relay 12 is used to switch the set current value.
5. Instead of the changeover switches 123 and 124, a high-speed switching element such as a transistor may be used for the operation. For example, when the load side capacity is 20 A, the set current value has two types of low current of 10 A and high current of 20 A. Although details of the overcurrent protection circuit 22 in the second power supply unit 2 are not shown, they have the same circuit configuration as the overcurrent protection circuit 21.

Each power supply control unit 13 (, 23) includes a power supply status output unit 131 (, 231) and a setting switching instruction unit 132 (, 232). Power status output unit 13
Each of the 1 (, 231) monitors the normal / abnormal state of the first (, 2) power supply unit 1 (, 2) in which the 1 (, 231) is provided, and the monitoring result is different from that of the side in which the 1 (, 231) is provided. The power is output to the power supply controller 23 (, 12) side. The setting switching instruction unit 132 (, 232) inputs the monitoring result from the power supply state output unit 231 (, 131) on the side of the other power supply control unit 23 (, 13) different from the side where the setting switching instruction unit 132 (, 232) is provided, and If it is abnormal, the overcurrent protection circuit 1 of the power supply unit 1 (, 2) on the side where the self is provided is
2 (, 23) is instructed to change the set current value. Power supply status output unit 13 on the side of the first power supply unit 1
The monitoring result of No. 1 is connected to the setting switching instructing unit 232 on the second power supply unit 2 side by the signal line 41 via the common unit 3 and is input. The monitoring result of the power supply state output unit 231 on the second power supply unit 2 side is connected to the setting switching instruction unit 132 on the first power supply unit 1 side by the signal line 42 via the common unit 3 and input. The normal / abnormal state of the power supply unit 1 of the power supply status output unit 131 is monitored by, for example, the AC input detection circuit 1311 and the DC output detection circuit 1312. AC input detection circuit 1311 and DC output detection circuit 13
12 is output from the OR circuit 1313 on the other side, for example, the setting switching instruction unit 232 of the second power supply unit 2.
To the signal line 41.

The AC input detection circuit 1311 monitors the AC input voltage of the power supply section 11 and makes an obstacle when the AC input voltage rises or falls below a specified voltage value. The DC output detection circuit 1312 causes the power supply section 1 to operate. The DC output voltage is monitored, and when the DC output voltage rises or falls below a specified voltage value, it is an obstacle. Power status output unit 132
The normal / abnormal state monitoring of the power supply unit 2 is also the same, but the monitoring result is connected to the setting switching instructing section 232 of the first power supply unit 1 on the partner side via the signal line 42. Also, when the monitoring result is normal, low level is output,
If it is not low level, it is abnormal. When the power supply unit 1 or 2 is removed from the common unit 3, the signal line 41
Alternatively, since 42 is not set to the low level, it is also abnormal in this case. The setting switching instructing units 132 and 232 use the signal line 41.
Alternatively, the set current value of the overcurrent protection circuits 12 and 22 on the self side is changed according to the monitoring result of the other side by 42. This change is performed by switching the fuses by driving the switching drive relays in the overcurrent protection circuits 12 and 22.

Next, the operation of the above embodiment will be described. First, the operation of the first power supply unit 1 will be described. When a power-on instruction is received from the outside, the setting switching instruction unit 132
Checks the state on the second power supply unit 2 side through the signal line 42. Because the input is low level,
When it is detected that the power supply unit 2 of 1 is normally operating, the setting switching instructing unit 132 instructs the overcurrent protection circuit 12 to set the current value for overcurrent detection to 10 A,
Set the changeover switches 123 and 124 to the fuse 12 for 10A.
Connect to side 1. On the other hand, when the low bell is not input to the signal line 42 and remains at the high level, it is determined that the second power supply unit 2 is not operating or is removed from the common unit 3, and the abnormal state is detected, and the overcurrent is detected. The protection circuit 12 is instructed to set current value for overcurrent detection to 20A, and the changeover switches 123 and 124 are connected to the fuse 122 side for 20A. Further, the power status output unit 131
Is the signal line 4 when the power supply unit 1 starts operating normally.
1, the setting switching instruction section 23 on the second power supply unit 2 side
Notify 2.

The second power supply unit 2 also operates in the same procedure as the operation of the first power supply unit 1 described above.

The power supply control unit 13 (, 23) always causes the signal line 42 (, 4) to be operated by the setting switching instruction unit 132 (, 232).
1) monitoring the status of other power supply units 2 (,
When the abnormality of 1) is detected, the overcurrent protection circuit 12 (, 22)
Change the setting value of. When the first and second power supply units are operating in parallel, the set current value of the overcurrent protection circuit 12 (, 22) is set to 10 A, and even if an overcurrent is about to flow, 10 + 10 = 20 A Protection is provided. Further, when either power supply unit 1 (or 2) is not operating (at the time of failure or when it is removed from the common unit 3), the overcurrent of the operating power supply unit 2 (or 1) is exceeded. The current setting value of the protection circuit 22 (or 12) is 20A
The overcurrent protection at the set current value 20A is performed by the above-described operation.

[0018]

As described above, according to the present invention, the respective power supply control units monitor the states of the other power supply units to change the set current value of the overcurrent protection circuit. The current when the load side is short-circuited can be suppressed without deteriorating the performance.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a redundant power supply device according to the present invention.

FIG. 2 is an example of a block diagram of a conventional dual power supply device.

FIG. 3 is an example of a block diagram of a conventional dual power supply device.

[Explanation of symbols]

 12,22 Overcurrent protection circuit 13,23 Power control unit 131,231 Power status output unit 132,232 Setting switching instruction unit

Claims (1)

[Claims] 1. A dual power supply device including a power supply unit and an overcurrent protection circuit that protects an output current of the power supply unit from flowing beyond a set current value. Is further provided with a power supply control unit, and each of the power supply control units has a normal power supply unit
If the result of monitoring from the power status output unit that monitors the abnormality and outputs the monitoring result to the power control unit of another power supply unit and the power status output unit of the other power supply unit is abnormal, A redundant power supply device, comprising: a setting switching instructing section for instructing the overcurrent protection circuit of the provided power supply unit to change the set current value.