JPS5866872A - Operation confirming system of electromagnetic circuit - Google Patents

Abstract

PURPOSE:To prevent the fact that an electromagnetic element becomes large- sized and driving electric power increases, by providing a capacitor and a current detecting element in parallel with a switching element, and detecting the charging and discharging currents flowing to the capacitor, by the current detecting element. CONSTITUTION:When a control signal is varied from a logical value ''0'' to ''1'', a transistor (TR) is varied to a conducting state, and a relay RL starts its operation. At the same time, charge which has charged a capacitor C is discharged through the TR being in a conducting state and a photocoupler PH1. As a result, a flip-flop FF is varied to a set state, and a confirmation signal outputted to an output terminal T2 from a terminal Q is also varied from a logical value ''0'' to ''1''. In this way, confirmation of operation of an electromagnetic circuit becomes executable without giving no change to an electromagnetic element for constituting the electromagnetic circuit, and it is prevented that the electromagnetic element becomes large-sized and driving electric power increases.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation confirmation method for an electromagnetic circuit, and particularly to an improvement in an operation confirmation method for an electromagnetic circuit including an electromagnetic element and a switching element for driving the electromagnetic element.

FIG. 1 is a diagram showing an example of a conventional electromagnetic circuit operation check system. In FIG. 1, a relay RL is provided as an electromagnetic element, and a transistor TR is provided as an opening/closing element. Input terminal T.

If the control signal applied to is a logical value O, transistor TR is in a blocking state and relay RL is not driven and is in a restoring state. When the control signal changes to logic 1, transistor TR becomes conductive and relay RL is driven into operation.

On the other hand, when the contact rl of the relay RL is in an open state, the confirmation signal changes to a logical value of 1. Therefore, H and K, which monitor the logic value of the confirmation signal output to the output terminal T, input terminal T.
, the operating state of relay RL can be confirmed based on the control signal applied to .

As is clear from the above explanation, in the conventional operation confirmation method for electromagnetic circuits, it is necessary to provide a dedicated contact point on the electromagnetic element to confirm operation. Electricity will also increase. In addition, the time required from applying the control signal until it is possible to confirm the operation using the confirmation signal includes the operating time of the electromagnetic element. When executed by a processing device or the like, the operation confirmation process, which takes a long time as described above, greatly puts pressure on the processing capacity of the multiprocessing device.

The purpose of this publication is to eliminate the shortcomings of conventional electromagnetic circuit operation confirmation methods as described above, and to eliminate the need for operation confirmation without increasing the size or driving power of electromagnetic elements. The aim is to realize means that can shorten time.

The purpose of this is to provide an electromagnetic circuit that includes an electromagnetic element and a switching element that drives the electromagnetic element, and to provide a capacitor and a current detection element in parallel with the switching element so that the switching element changes from a conducting state to a blocking state. At times, a charging current flows from the drive power source of the electromagnetic element to the capacitor, and when the switching element changes from a blocking state to a conductive state,
This is achieved by detecting the discharge current flowing from the capacitor via the switching element with the current detection element.

An embodiment of the present invention will be described below with reference to FIG. Second
The figure is a diagram showing a method for confirming the operation of an electromagnetic circuit according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In Diagram 2, relay R is used as an electromagnetic element.
In addition, a transistor TR is provided as a switching element, and a capacitor C and a photocoupler voltage and PH1 are provided as current detection elements. Same as Figure 1, 2nd
Also in the figure, when the control signal applied to the input terminal T has a logic value of 0, the transistor TRFi is in the blocking state, and the relay RL is not driven and is in the recovery state. In this state, capacitor C is charged to 53 volts by 148 volts and +5 volts, which are the driving power sources for relay RL, via relay RL and photocoupler PH.

In addition, due to the charging current flowing during charging, the photocoupler PH
I is activated and inputs a logic value of 1 to the reset terminal R of the flip-flop FF. As a result, the flip-flop F
F maintains the reset state and outputs a confirmation signal with a logic value of 0 from the terminal Q to the output terminal T. Next, when the control signal changes from a logical value of 0 to a logical value of 1, the transistor TR, which has been in a blocked state, changes to a conductive state, and the relay RL starts operating. At the same time, the charge stored in the capacitor C is transferred to the conductive pointed transistor TR and the photocoupler P.
The zero-indicating capacitor 9 PH+, which is discharged via R, is energized by the discharge current flowing during the discharge, and inputs a logic value of 1 to the set terminal S of the flip-flop FF in the reset state.As a result, The flip-flop FF changes to the set state, and the confirmation signal output from the terminal Q to the output terminal T also changes from a logic value of 0 to a logic value of 1. Further, when the control signal changes from a logical value of 1 to a logical value of 0, the transistor TR, which has been in a conductive state, changes to a blocked state, and the relay RL starts to recover. Conde at the same time? C begins to be charged with -48 volts and +5 volts DC via relay RL and photocoupler PH. Therefore, Hotokabu 2
PH, is energized by the charging current and inputs a logic value of 1 to the reset terminal R of the flip-flop FF. As a result, the flip-flop FF in the set state changes to the reset state, and the confirmation signal output from the terminal Q to the output terminal T also changes from the logical value 1 to the logical value 0. Note that if the relay RL is disconnected or the transistor TR does not normally change into a conductive state or a blocked state depending on the control signal, the capacitor C will not be charged or discharged even if the logical value of the control signal changes. Because it will not be done, hot turnip / FP
As is clear from the fact that the logic value of the confirmation signal output from the terminal Q of the flip-flop FF does not change when HI or PHJf'i is not energized and is 0 or more, according to this embodiment, the logic value of the confirmation signal output from the output terminal does not change. The logical value of the confirmation signal is determined by directly detecting the state change of the transistor TR by the capacitor C and the photocouplers PIi+ and PH.
Since it can be changed, there is no need to provide a dedicated contact in relay RL for operation confirmation. In addition, the delay time from when the logical value of the control signal changes to when the logical value of the confirmation signal changes includes only the operating time of the transistor TR, Hotcub-7PL or PH, and flip 70-tube FF; Since the operating time of RL is not included, the time required to confirm the operation using the confirmation signal is dramatically shortened compared to that shown in FIG.

Note that FIG. 2 is only one embodiment of the present invention, and the electromagnetic elements, switching elements, current detection elements, etc. are not limited to those shown in the figure, and many other modifications may be considered. However, the effects of the present invention do not change in either case.

As described above, according to the present invention, it is possible to check the operation of an electromagnetic circuit without making any changes to the electromagnetic elements constituting the electromagnetic circuit, and it is possible to increase the size of the electromagnetic elements and increase the driving power. is prevented. Furthermore, since the required operation confirmation time does not include the operation time of the electromagnetic elements, it is significantly shortened, and is particularly effective for operation confirmation using electronic multiprocessing devices and the like.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional electromagnetic circuit operation check method, and FIG. 2 is a diagram showing an electromagnetic circuit operation check method according to an embodiment of the present invention. In the figure, TR is a transistor, RL is a relay +, rt
is a contact, C is a capacitor, PH, and PH. is a photocoupler, FF is a flip-flop, and INV. and INV are inverters, D is a diode, R1 to R are resistors, T+ is an input terminal, and TI is an output terminal. -Riko 1 3 S 4 +5V Akira 2 Figure +SV vz -Ichitsuchi T2

Claims (1)

[Claims] In an electromagnetic circuit that includes an electromagnetic element and a switching element that drives the electromagnetic element, a capacitor and a current detection element are provided in parallel with the switching element, and when the switching element changes from a conducting state to a blocking state, the electromagnetic The current detecting element detects a charging current flowing from the driving power source of the element to the capacitor, and a discharging current flowing from the capacitor via the switching element when the switching element changes from a blocking state to a conducting state. An operation confirmation method for an electromagnetic circuit, characterized in that the operation of the electromagnetic circuit can be confirmed by doing so.