JPS6179170A - Method and device for measuring multipoint input - Google Patents

Abstract

PURPOSE:To simplify a device and to reduce the cost by providing a capacitor with a relay for charging and also a relay for measurement, and bringing a relay for input/output switching, the relay for charging, the relay for measurement, etc., under program control. CONSTITUTION:The capacitor 5 of the measuring device is provided with a relay contact 6 for charging and also a relay contact 9 for measurement is connected to an amplifier 10 for measurement. Then, relay contacts 3-1, 3'-1, 3-n, and 3'-n for input/output switching, relay contact 6 for charging, relay contact 7 for discharging, and relay contact 9 for measurement are put in operation successively through a sequence controller 12 according to a present program. When the measurement is started, the relay contacts 3-1 and 3'-1 for input/output switching are made, but other relays 6, 7, and 9 are all off and a current flows through either the relay contact 3-1 or 3'-1 to cause no influence of a rush current, so a large-capacity relay, etc., are not necessary and the constitution is simplified.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for sequentially switching and measuring multiple inputs of large-capacity electrical signals that require high insulation in electrolytic cells and other devices, and a method used to implement the method. Regarding equipment.

[Conventional technology]

When measuring the voltage of a multi-point signal source such as a conventionally known electrolytic cell, which has a large current capacity, has a lot of inductive noise, and has a poor S/N ratio,
Measurements are generally performed using a combination of an isolated circuit consisting of a relay and a capacitor and an isolated measuring amplifier.

An example of the device used for this conventional multi-point input measurement is shown in the second section.
This will be explained using the circuit shown in the figure.

In Figure 2, 1-1.1'-1, 1-2, 1'-2, .-
---1.-4n', 1' n is an input terminal, 2-1.
2'-1, 2-2, 2'-2,...-----2-
n, 2'-n is a safety fuse, 3-1.3'-1,3
-2, 3'-2, ...--1--, 3-n, 3'-n
is a relay contact for input switching, 4.4 is a high-frequency noise cutting coil, 5 is a capacitor, 7 is a discharge relay contact,
11 is the relay contact 3-1, 3'-1, 3-2, 3'
-2, --...3 ns 3' A sequence control circuit that controls -n and 7, 8 a discharge resistor, and 10 a measurement amplifier.

Therefore, one of the input switching relay contacts, for example 3-1.3
When '-1 is turned on, a signal current flows from the signal input terminal 1 as shown by the arrow -, charges the capacitor 5 through the high-frequency noise cutting coil 4, and the voltage across the capacitor 5 is measured as a signal voltage by the measuring amplifier 10. be done.

Next, the input switching relay contact 3-1, which had been turned on, was turned on.
Turn 3'-1 OFF, temporarily cut off the circuit from the signal source,
After temporarily turning on the discharge relay contact 7 to discharge the capacitor 5 through the resistor 8, turn on the input switching relay contact for the next signal source, for example 3-2.3'-2, and measure the signal voltage. The voltages of each of the signal sources are measured in sequence.

In this conventional multi-point input measurement, input switching relay contacts 3-1, 3'-1, 3-2, 3'-2, -------
--3n % 3' A rush current will flow through the -n contact each time it is turned on or off,
For this reason, general-purpose small contact relays etc. have input switching relay contacts 3-1, 3'-1, 3-2, 3'-2, etc.
----3n s 3 'n can be used,
Since it was necessary to install a large number of expensive large-capacity relays such as mercury relays according to the number of measurement points, there was a problem in that the device became too expensive and uneconomical.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional methods described above and to provide a new method for multi-point input measurement using an economical and simple device with reduced costs.

[Means for solving problems]

The gist of the present invention is, in multi-point input measurement using the capacitor charging type isolation circuit described above, to insert a switching element for capacitor charging in series in the capacitor charging circuit, and to , the switching element for input switching, the switching element for capacitor charging, the switching element for measurement, and the switching element for capacitor discharging are operated in sequence according to a preset program, and the switching element for charging current is controlled by the switching element for charging the capacitor. The purpose is to perform this using only elements.

[Effect]

By configuring it as described above, no current flows through the relay contact when the input switching relay contact is turned on or off, and the burden of consumption due to rush current is absorbed by the contact when the capacitor charging relay opens and closes. Therefore, one large-capacity relay is sufficient, and thus it is possible to provide an economical, simple, and novel multi-point input measuring method and device.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of a multi-point input measuring device according to the present invention.

In Figure 1, 1-1.1'-1, 1-2, 1'-2, -.
・-・・-1-n, 1'-n are input terminals, 2-1.2'
-1, 2-2, 2'-2, -1111・-2-n, 2'
-n is a safety fuse, 3-1.3'-1, 3-2, 3
'-2, -・-～--・-3-n, 3'-n are input switching relay contacts, 4.4 is a high frequency noise cutting coil,
5 is a capacitor, 6 is a relay contact for charging, 7 is a relay contact for discharging, 8 is a resistor for discharging, 9 is a relay contact for measurement,
10 is a measurement amplifier, and 12 is a sequence controller for each of the above-mentioned relays.

For example, when the input terminal 1-1.1'-1 inputs a signal, when the input switching relay contact 3-1.3'-1 turns on, the safety fuse 2-1.2'-1 and the input switching relay contact 3-1.3'-1 turn on. It is led to the capacitor 5 via the relay contact 3-1.3'-1 and the high-frequency noise canting coil 4, but while the capacitor charging relay contact 6 is OFF, no current flows through these circuits, but the charging relay When contact 6 is turned on, capacitor 5 is charged via the above circuit.

Measuring relay contact 9 connects the circuit and measuring amplifier 1 only during measurement.
Connect 0. In other words, the capacitor 5 of the measurement relay contact 9 is fully charged, and the input switching relay contact 3
-1.3'-1 is turned off and then turned on, whereby the charging voltage of the capacitor 5 is measured. However, this measuring relay contact 9 is not essential, and can be omitted if the measuring amplifier 10 is of a high impedance due to human input, such as an insulated type.

The discharging resistor 8 and the discharging relay contact 7 are for discharging the capacitor 5 as in the conventional method, and the measurement of the charging voltage of the capacitor 5 is completed.

N, and the charge in the capacitor 5 is discharged.

Therefore, these input switching relay contacts 3-1.3'-1
, 3-2, 3'-2, -・-------3-n, 3'-
All relays including charging relay contact 6, discharging relay contact 7, and measuring relay contact 9 are sequentially controlled by a controller 12.

Next, the operation of the circuit will be explained.

First, all relays are initially in an OFF state.

When measurement starts, the setting program of the sequence controller 12 first turns on the input switching relay contact 3-1.3'-1 connected to the input terminal 1-1.1'-1. All other relays are OFF, and no current flows through the input switching relay contacts 3-1, 3'-1, so the influence of rush current, which is the problem mentioned above, does not occur at all.

Next, the capacitor charging relay contact 6 connected in series to the capacitor 5 is turned on to charge the capacitor 5, and after charging is completed, the input switching relay contact 3-1.3'-
1 is set to OFF. At this time, the potential between the input and output terminals of input switching relay contact 3-1.3'-1 is the same, so input switching relay contact 3-1.3'
No electrical load is applied to the contact '-1.

Next, turn ON the measuring relay contact 9, and turn on the measuring amplifier 1.
0 to measure the capacitor voltage, that is, the input voltage.

At this point, the measuring amplifier 10 is already insulated from the signal input side, so the measuring amplifier 10 can be used as either a non-insulated type or an isolated type.

When the measurement is completed, turn off the measurement relay contact 9 and then
The discharge relay contact 7 is turned on to discharge the charge in the capacitor 5 through the discharge resistor 8.

After discharging, turn off the gold relay and connect the next input terminal 1-
2. Moving to the measurement cycle 1'-2, the measurement cycle operation is repeated sequentially and continues up to the input terminals 1-n and 1'-n.

The above measurement cycle operation is repeated according to the setting program of the sequence controller 12 to perform measurements.

It should be noted that the configuration of the present invention is not limited to the embodiments on paper; for example, in the above embodiments, a relay is shown as a switching element, but a switching element such as a thyristor or an SCR can also be used. In addition, the insertion point is not limited to the illustrated position, but may be inserted anywhere within the capacitor charging circuit, and the shape of each component,
The dimensions etc. can be freely changed within the scope of the purpose of the present invention, and the present invention encompasses all of them.

〔Effect of the invention〕

Since the present invention is configured as shown on paper, according to the present invention, one large-capacity switching element such as a conventional expensive mercury relay is sufficient, and a small-capacity switching element such as a general-purpose small relay is sufficient as a manual switching relay. The present invention can provide a new economical and simple multi-point input measuring method and device that can reduce costs, reduce size and weight, since switching elements of 1 to 1 can be used.

Furthermore, as for the measuring amplifier, conventionally an insulated type amplifier is required, but in the method of the present invention, either an insulated type or a non-insulated type can be used.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a multi-point input measuring device according to the present invention, and FIG. 2 is an explanatory diagram showing an example of the circuit of a conventional device used for multi-point input measuring.

Claims (1)

[Claims] 1) Consisting of a capacitor, a plurality of input switching switching elements that sequentially connect the capacitor to a number of signal sources to be measured, at least one resistor, and a switching element for discharging the capacitor. In a method for sequentially measuring a large number of signal inputs using a capacitor discharge circuit connected to the capacitor, a device capable of measuring the voltage of the capacitor, and a device controlling the operation of each of the components, A switching element for capacitor charging is inserted in series in the charging circuit for the capacitor, and the switching element for input switching, the switching element for capacitor charging, and the switching element for capacitor discharging are sequentially operated in rotation according to a preset program. A multi-point input measurement method characterized by: 2) A capacitor, a plurality of input switching switching elements that sequentially connect the capacitor to a large number of signal sources to be measured, and at least one resistor and a capacitor discharge switching element are connected in series. In a device that sequentially measures a large number of signal inputs using a capacitor discharge circuit connected to a capacitor, a device that can measure the voltage of the capacitor, and a device that controls the actions of each of the components, The multi-point input measuring device as described above, characterized in that a charging switching element is inserted in series in the charging circuit of the capacitor, and the control device is configured to also control this charging switching element.