JPH09130970A - Unit for turning power supply on/off - Google Patents

Abstract

PROBLEM TO BE SOLVED: To interrupt a power supply with a time lag when it is turned off and to execute required processing surely at the time of interrupting power supply. SOLUTION: When a switch 2 is turned on by a worker, power supply current is fed through the switch 2 to a power supply control circuit 5 and a CPU 52 is actuated to close a relay 3. Consequently, power supply current is fed through the line of two systems passing the switch 2 and relay 3, respectively. When the switch 2 is turned off by a worker, power supply current is fed continuously through the relay 3 to power supply control circuit 5. When the turn off operation of switch 2 is recognized, the CPU 52 performs processing required for interrupting the power supply and then opens the relay 3 to interrupt the power supply current thoroughly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device used in an analytical measuring device or the like, and more particularly to control of turning on / off of the power supply.

[0002]

2. Description of the Related Art In an analytical measuring device, the power of the entire device is turned on / off by turning on / off a power switch provided on an operation panel. However, in practice, even if the switch is turned off by an operator, there are some cases in which the power supply must be cut off after the necessary processing operation is completed inside the device before the power supply is cut off. For example,
In the infrared spectrophotometer, the movable mirror in the interferometer is made slidable while the power is on, and it moves from the vibration given from the outside when the device is moved while the power is cut off. It is preferable to lock the sliding mechanism to protect the mirror. That is, in this type of device, even if a switch is turned off by an operator, the electric circuit inside the device is energized for a while, and the power is cut off after completing a predetermined series of processing operations.

[0003]

Conventionally, as a power supply device in which the power is cut off with such a time delay, there is an electromagnetic relay device having a complicated circuit configuration and causing a time delay, but the cost is low. It was expensive and not suitable for miniaturization.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a processing operation required when an operator turns off a power switch with a simple and inexpensive structure. An object of the present invention is to provide a power-on / interruption device having a delay function so that the power supply can be reliably ended.

[0005]

SUMMARY OF THE INVENTION A power on / off device according to the present invention made to solve the above problems is a) switch means which is turned on / off by an operator's operation, and b) A first line for supplying a current through the switch means, c) a relay means which is in an open state when not energized, and d) a current from the same input terminal as the first line through the relay means. A) second line for supplying the power source, e) a detection means for detecting the on / off state of the switch means, and f) both the first and second lines connected in parallel as a power supply line, When the switch means is turned on, the relay means is closed after a current is supplied through the first line, and when the switch means is turned off, the detection means detects that the switch means is turned off, and a predetermined value is detected. After finishing the processing operation, It is characterized by and a control means for opening the conductor means.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the power-on / off device according to the present invention, the first line via a switch that is manually opened / closed by an operator as a relay means, for example, a control means for controlling opening / closing of an electromagnetic relay. The power supply current is supplied in parallel by the two-system wiring of the second line via the relay and the second line. Specifically, the control means is composed of a microcomputer (hereinafter referred to as "microcomputer") and the like, and the detection means is composed of, for example, a switch which works with ON / OFF of the switch means and a circuit which detects conduction of the switch. Of course,
The detection circuit may be provided inside the microcomputer.

When an operator turns on the switch means, that is, when the power is turned on, a power supply current is first supplied to the microcomputer through the first line, and when the microcomputer starts operating, the relay is closed according to an internal program. . As a result, the power supply current is also supplied to the microcomputer through the second line.

When the switch means is turned off by an operator, that is, when the power source is cut off, the first
The power supply current through the line is cut off, but the power supply current continues to be supplied to the microcomputer through the second line. When the microcomputer recognizes that the switch means has been turned off by the detecting means, it performs a necessary processing operation (or outputs a command for performing the processing) at the time of power-off according to an internal program. Then, after this processing operation is completed, the relay is opened to completely cut off the power supply current supplied to the microcomputer itself.

[0009]

As described above, according to the power-on / off device of the present invention, with the simple circuit configuration, even after the operator turns off the power switch, the necessary processing is performed inside the device before the power-off. Can be surely ended.

[0010]

【Example】

[Embodiment 1] A first embodiment (hereinafter referred to as "embodiment 1") of a power-on / interruption device according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of this apparatus, FIG. 2 is a control flow chart at power-on, and FIG. 3 is a control flow chart at power-off. In FIG. 1, the hot-side line and the cold-side line of the 100V AC voltage inlet 1 are connected to one end of two switches of the three switches 2 and one end of the two relays 3. The relay 3 is of a type in which the contacts are opened when the coil is not energized. The other end of the relay 3 and the hot side line and the cold side line at the other ends of the two switches of the switch 2 are connected to each other and wired to the main circuit unit 4 and the power supply control circuit 5 to which current is to be supplied. The power supply control circuit 5 includes a CPU 52, a relay drive circuit 51, and a memory (ROM and RAM) 53 inside. The CPU 52 also controls the processing operation in the main circuit section 4. Both ends of the switch 2 other than the above two switches are connected to the CPU 5
2 switch monitoring port. In addition, in the main circuit unit 4 and the power supply control circuit 5, an AC 10
The 0V power supply voltage is used after being rectified and stepped down by a transformer or the like.

First, the operation when the power is turned on will be described. Before the power is turned on, both the switch 2 and the relay 3 are in an open state, so that no power supply current is supplied to the main circuit section 4 and the power supply control circuit 5. When the operator turns on the switch 2 (step S1), the power supply current is supplied to the main circuit unit 4 and the power supply control circuit 5 through the power supply line (first line) via the switch 2. When the power supply current is supplied and the operation is started (step S2), the CPU 52 first gives a command to the relay drive circuit 51 to close the relay 3 (step S3).
Therefore, the power supply current is supplied through the two power supply lines that respectively pass through the switch 2 and the relay 3.

Next, the operation when the power is cut off from the energized state will be described. In the energized state, the CPU 52 periodically monitors the switch port and determines whether the switch 2 is in the on state (step S11). Switch 2
Is ON, the process proceeds to step S12, and the CPU 52 performs a processing operation other than power supply control. When the operator performs an operation for shutting off the power, it is detected in step S11 that the switch 2 is off. In that case, the process proceeds to step S13, and the CPU 52 completes the necessary processing operations before the power is shut off. That is, during this period, the power supply current is supplied only from the power supply line (second line) via the relay 3. After completing the series of processes, the CPU 52 gives a command to the relay drive circuit 51 to open the relay 3 (step S14). As a result, the power supply current supplied to the main circuit unit 4 and the power supply control circuit 5 is completely cut off.

[Embodiment 2] Next, a second embodiment (hereinafter referred to as "Embodiment 2") of the power on / off device according to the present invention will be described with reference to the drawings. FIG. 4 is a block diagram of this apparatus, FIG. 5 is a control flow chart at power-on, and FIG. 6 is a control flow chart at power-off. The configuration of FIG. 4 differs from that of FIG. 1 in that the switch 2 is of a double type connected to a power supply line, and a relay 6 is provided between the switch 2 and the main circuit unit 4 and the power supply control circuit 5. And a hot-side line between the switch 2 and the relay 6 for detecting the on / off state of the switch 2,
The photo triac 7 is provided between the cold side tracks. The relay 6 is of a type in which the contacts open when the coil is energized.

First, the operation when the power is turned on will be described. Before the power is turned on, both the switch 2 and the relay 3 are in the open state, so that the power supply current is not supplied to the main circuit unit 4 and the power supply control circuit 5. At this time, the relay 6 is in a closed state. When the operator turns on the switch 2, (step S
21), the power supply line (first line) through the switch 2
A power supply current is supplied to the main circuit unit 4 and the power supply control circuit 5 through the. When the power supply current is supplied and the CPU 52 starts the operation (step S22), first, the relay drive circuit 5
1 to give a command to close the relay 3 (step S23),
After that, the relay 6 is opened (step S24). Therefore, the main circuit portion 4 and the power supply control circuit 5 are supplied with the power supply current through the power supply line (second line) via the relay 3, and the phototriac 7 is supplied with the current via the switch 2. The phototriac 7 outputs a pulse signal corresponding to the frequency of the AC power source when current is supplied.

Next, the operation when the power is cut off from the energized state will be described. In the energized state, the CPU 52 periodically monitors the switch port and determines whether or not the signal from the phototriac 7 is periodically obtained, thereby determining whether or not the switch 2 is in the ON state ( Step S31). If the switch 2 is in the ON state, the process proceeds to step S32, and the CPU 52 performs a processing operation other than the power supply control. When the operator turns off the switch 2, current is not supplied to the phototriac 7, and a periodic signal cannot be obtained. In that case, the process proceeds from step S31 to S33, and the CPU 52 completes the necessary processing before the power is shut off.
After completing the series of processes, the CPU 52 gives a command to the relay drive circuit 51 to open the relay 3 (step S3).
4). As a result, the power supply current supplied to the main circuit unit 4 and the power supply control circuit 5 is completely cut off.

As described above, in any of the first and second embodiments, even after the worker cuts off the main power switch, the power supply current is continuously supplied until a necessary processing operation is completed inside the apparatus, and a series of processing is performed. The power of the entire device can be shut off after completion of the above.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first power-on / interruption device according to the present invention.
FIG.

FIG. 2 is a control flowchart when power is turned on in the first embodiment.

FIG. 3 is a control flowchart when power is cut off in the first embodiment.

FIG. 4 is a second view of the power-on / off device according to the present invention.
FIG.

FIG. 5 is a control flowchart at power-on in the second embodiment.

FIG. 6 is a control flowchart when power is cut off in the second embodiment.

[Explanation of symbols]

 1 ... AC inlet 2 ... Switch 3 ... Relay 4 ... Main circuit part 5 ... Power supply control circuit 51 ... Relay drive circuit 52 ... CPU 53 ... Memory 6 ... Relay 7 ... Phototriac

Claims (1)

[Claims] 1. A) switch means which is turned on / off by an operator's operation, b) a first line for supplying a current through the switch means, and c) an open state when not energized. D) a second line for supplying a current from the same input terminal as the first line via the relay means, and e) a detection for detecting the on / off state of the switch means. And f) both the first and second lines are connected in parallel as a power supply line, and when the switch means is turned on, a current is supplied through the first line and then the relay means is closed, and When the switch means is turned off, the detection means detects that the switch means has been turned off, and the control means opens the relay means after completing a predetermined processing operation. Closing and breaking device.