JP2000163138A - Power source system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power source system capable of safely operating the disconnection of the power source of outside equipment and connection at the time of restoration even when the abnormality of a power source to be supplied to the outside equipment is caused in a power source system. SOLUTION: This power source system provided with an AC/DC converting part 2 for receiving a commercial AC power source, and for converting it into DC, a power source situation monitoring part 3 for monitoring the converted power source, a DC/voltage converting part 4 connected through the monitoring part 3, and a power source opening and closing part 8 for opening and closing the connection of the converted power source with outside equipment 5 is provided with a function for transmitting the abnormality of the power source detected by the monitoring part 3 to a CPU connected as the outside equipment, supplying a power by capacitors arranged at the monitoring part 3 and the DC/voltage converting part 4, and interrupting the power source opening and closing part 8 in response to an instruction from the CPU.

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 for transmitting power to an external device to which a plurality of devices are connected, and more particularly to a power supply system for performing control when a commercial power supply is abnormal.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing control of a power supply when a conventional external device is connected and used.

In FIG. 1, power is supplied from a commercial power supply 13 to an external device 5 via an AC / DC converter 2, and the uninterruptible power supply 12 Is used. The uninterruptible power supply 12 is directly connected to a commercial AC power supply, detects an abnormality such as a power failure or a voltage drop of the supplied commercial power supply 13, and outputs an “abnormal signal 1” to the CPU 7 connected to the abnormal output.
0 ", and further, power is supplied by discharging the battery of the uninterruptible power supply 12, and when the charging voltage of the battery decreases," discharge end 14 "is output.

Further, in the uninterruptible power supply 12 described above, no matter what state the connected equipment is in,
At the end of discharge, the power supply to the equipment is cut off at once, so the use state of each equipment was not taken into account.Batteries used to supply power to the equipment were often lead batteries. In addition, a large-sized battery is required to secure the used capacity, and replacement is required every three to four years for security. When the power is restored, the power is supplied at one time regardless of the state of the device. In order to operate the external device 5, a procedure such as a mechanical restoration and a data restoration is required. However, trouble occurred because of the non-procedural return at once.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and even if an abnormality occurs in power supply to an external device, it is safe to shut off the power supply of the external device and connect it when returning. It is an object of the present invention to provide a power supply system that can be easily operated.

[0006]

According to a first aspect of the present invention, there is provided a power supply system comprising: an AC / DC converter for receiving a commercial AC power and converting it to a DC; a power status monitor for monitoring the converted power; A power supply having a DC voltage converter connected via the monitor, a power switch for opening and closing the connection of the converted power supply to the external device, and a power supply detected by the monitor connected to a CPU connected as the external device. After transmitting the abnormality, power is supplied by the capacitors arranged in the monitoring unit and DC voltage conversion unit,
Further, it has a function of shutting off the power supply opening / closing unit in accordance with an instruction from the CPU.

[0007] The power supply system according to claim 2 of the present invention comprises:
At the time of power failure recovery, the power supply switching unit is connected to the external device controlled by the external CPU in the order registered in advance.

[0008]

Embodiments of the present invention will be described below.

FIG. 1 is a block diagram showing a circuit configuration according to an embodiment of the present invention. The main body of the power supply unit 1 is provided with a DC / AC converter 2 that receives a commercial power 13 and converts the converted power into a direct current. The converted power is connected to a connector 11 that connects the converted power to the external device 5. The power converted to DC is connected to a DC voltage converter 4 that converts the output to the voltage of the external device 5 via a power status monitor 3 that monitors the state of the power to be supplied. The power supply status monitoring unit 3 has a main CPU 7 (hereinafter referred to as C
PU7. ) Can be transmitted. Further, a power switch 8 for opening and closing the connection is connected between the DC voltage converter 4 and the connector 11 connected to the external device 5.

The DC / AC converter 2 uses a power supply unit for converting 100 V, which is the commercial power supply 13, to DC 24 V, which is a control voltage, and can use a general-purpose power supply unit. This power supply unit can select the conversion voltage to 24 V, 12 V, 5 V, etc. according to the control voltage. The power supply status monitoring unit 3 connected to the DC / AC converter 2 detects when the voltage output from the DC / AC converter 2 falls from 70% to 60% or less of the rated voltage. The descent can be detected. The "abnormal signal 10" output when detected is
When the CPU 7 receives this signal as a contact signal to the CPU 7, an abnormal action can be taken.

A capacitor 9 is connected between the monitoring unit 3 and the DC voltage conversion unit 4 so that the DC voltage conversion unit 4 receives a voltage drop or a power failure from the DC / AC conversion unit 2 when a power failure occurs. Power can be supplied for a certain period of time. The supply time varies depending on the capacity of the external device 5 connected to the DC voltage converter 4, but the external device 5 can supply at least 0.8 seconds or more. This time is set based on the abnormality processing time of the connected external device 5, and it is only necessary to maintain the time during which the external device 5 can cope with the abnormality.

A power switching unit 8 provided between the DC voltage conversion unit 4 and the connector 11 connected to the external device 5 includes:
An opening / closing device that is controlled to be connected / disconnected according to an instruction from the CPU 7 that is externally connected, and cannot be opened / closed by controlling the power supply unit 1 body. The power switching unit 8 connected to the DC voltage conversion unit 4 is provided between externally connected devices, and the CPU 7 connected to the outside operates the DC power supply without passing through the power switching unit 8. Supplied.

The DC power supply conversion unit is a general-purpose power supply unit selected according to the control voltage of the external device 5 to be connected.
A conversion voltage such as V can be selected.

With respect to the power supply system of the present invention having the above configuration, the operation when the commercial power supply is abnormal and the operation for recovering from the abnormality will be described below with reference to the block diagram of FIG.

For example, a plurality of system-controlled devices are connected as the external device 5 (hereinafter, referred to as a system device 6), a main CPU 7 for controlling the system device 6 is connected to the connector CN0, and a connector CN1. Is a driving device (hereinafter, referred to as device 1) constituting the system device 6, a connector CN2 is a reading unit (hereinafter, referred to as device 2) for reading information by the operation of the driving device, and a connector CN3 is. Denotes an operation unit (hereinafter, referred to as a device 3) for calculating information based on information selected from the reading unit, and an output unit for performing output processing based on the operation result of the operation unit is connected to the connector CN4. .
And a DC power converter and a DC / AC converter 2 respectively.
And power supply switching units 8R1, R2, R3 are connected between the connectors CN1, CN2, CN3.
The CPU 7 is connected to the system device 6, controls each device, and can grasp the status and state.

Generally, abnormalities of the commercial power supply 13 include a complete power failure state, a voltage drop, and a surge voltage. The present invention compensates for power outages and voltage drops.

First, an abnormality of the commercial power supply 13 is detected by the power supply status monitor 3 connected to the output of the DC / AC converter 2, and an “abnormal signal 10” is output to the CPU 7. Then, the CPU 7 receiving the "abnormal signal 10"
Performs processing to grasp the status of the externally connected peripheral system devices 6. That is, the operating status of the system device 6, the driving status of the device 1, the reading status of the device 2, and the calculation status of the device 3 are grasped.

In the power supply system according to the present invention, even if an abnormality occurs in the commercial power supply 13, since the capacitor 9 is arranged on the circuit, the power stored in the capacitor 9 is discharged during the abnormality to stabilize. Power can be supplied.
The capacitor 9 is always charged during normal use, so that it can be prepared for an abnormal situation. Therefore, when the "abnormal signal 10" is output, the system device 6 is operating normally due to the discharge of the capacitor 9. Here, the CUP determines an abnormal state based on the output state of the “abnormal signal 10”. An abnormal condition such as voltage drop, instantaneous power failure, or power failure is determined based on the time during which the “abnormal signal 10” is output, and how the externally connected system device 6 is processed. Make a decision. That is, since the discharge capacity of the capacitor 9 is determined, the power supply cutoff processing is performed when the discharge time exceeds the discharge time. If the time during which the processing of the system device 6 can be ended is the determination time, for example, if the "abnormal signal 10" is output for 0.5 seconds, it is determined that the power has stopped, and the power supply is determined to be shut off. That is, the CPU 7 issues a power-off process command to the system device 6 and interrupts the process, stores data in the memory, or outputs a display indicating that the device has been stopped so that the power may be turned off. Or By this processing, the system device 6 is in a state where no trouble occurs even if the power is cut off. During this time, these system devices 6 can continue processing with the power supply discharged from the capacitor 9. Further, in order to protect the safety of the system device 6, the CPU 7 cuts off the power switch connected to the external device 5 to cut off the supplied power circuit. During this time, processing can be performed within 0.8 to 1 second after the "abnormal signal 10" is output.

If the output is less than 0.5 seconds even if the "abnormal signal 10" is output, it is determined as an instantaneous power failure or a temporary voltage drop, and the CPU 7 continues the normal operation.

On the other hand, when the commercial power supply 13 returns and the system equipment 6 returns after the power supply opening / closing section 8 is shut off and power failure processing is performed, first, power is supplied to the CPU 7 to control the system equipment 6. Sub-part processing to be performed is performed. And CPU
7 is ready for operation,
Power is supplied to each of the devices 1, 2, and 3 in the order registered in. This is to connect the power open / close units 8R1, R2, R3 by the output processing of the CPU 7. In other words, in the power supply system of the present invention, the DC / AC converter 2 that receives the commercial power 13 and converts it to DC, and the converted power is supplied to the external device 5. An external device 5 is connected via a connector 11 to be connected, and is connected to a DC voltage converter 4 for converting an output to a voltage of the external device 5 via a power status monitor 3 for monitoring the state of the power to be supplied. Therefore, when an abnormality of the commercial power supply 13 occurs, the power supply state monitoring unit 3 indicates an abnormality to the externally connected main CPU 7 by “an abnormality signal 1”.
By transmitting "0", the CPU 7 can output a power-off processing command for the external device 5 connected as the system device 6 from the CPU 7, and the power can be turned off when the power-off preparation is completed.

Further, when the power is restored, the power is supplied from the CPU 7, so that the CPU 7 can determine the power supply to the external device 5.

[0022]

As described above, the power supply system according to claim 1 of the present invention comprises: an AC / DC converter for receiving a commercial AC power supply and converting the AC power to DC; a power supply status monitor for monitoring the converted power supply; A power supply having a DC voltage converter connected via the monitor, a power switch for opening and closing the connection of the converted power supply to the external device, and a power supply detected by the monitor connected to a CPU connected as the external device. After transmitting the abnormality, power is supplied by the capacitors arranged in the monitoring unit and DC voltage conversion unit,
Furthermore, since the power supply switching unit is shut off by the instruction of the CPU, even if the commercial power supply is interrupted, the external equipment connected to the power supply system of the present invention does not instantaneously lose the power and performs the shutdown processing sequentially according to the instruction of the CPU. And shut off the power supply path for each. As a result, the external device can maintain a state in which the power can be easily restored, and since the power supply path is cut off, the discharge of the capacitor supplying the power in the event of a power failure can be suppressed, and the power supply when the power is suddenly restored can be suppressed. Can be prevented.

According to the second aspect of the present invention, at the time of power failure recovery, the external devices controlled by the external CPU are connected to the power supply opening / closing unit in a previously registered order. Operation can be resumed normally without the occurrence of

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a circuit configuration according to an example of an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional circuit configuration of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply unit 2 AC / DC conversion part 3 Monitoring part 4 DC voltage conversion part 5 External equipment 6 System equipment 7 Main CPU 8 Power supply opening / closing part 9 Capacitor 10 Abnormal signal 11 Connector

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Takaoka 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Inventor Koji Maeda 1048 Kadoma Kadoma Kadoma City Osaka Prefecture 72) Inventor Yuko Morita 1048 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Works Co., Ltd. 1048 Kadoma Kadoma Kadoma Matsushita Electric Works Co., Ltd.F-term (reference)

Claims (2)

[Claims] 1. An AC / DC converter for receiving a commercial AC power and converting it to DC, a power status monitor for monitoring the converted power, a DC voltage converter connected via the monitor, and a converter. And a power switching unit for opening and closing the connection of the power supply to the external device. After transmitting the power abnormality detected by the monitoring unit to the CPU connected as the external device, the power supply switching unit is disposed in the monitoring unit and the DC voltage conversion unit. Power is supplied by the capacitor,
Further, a power supply system having a function of shutting off a power supply opening / closing unit according to an instruction of a CPU. 2. The power supply system according to claim 1, wherein at the time of power failure recovery, the power supply opening / closing unit is connected to the external devices controlled by the external CPU in the order registered in advance.