JPH0783567B2 - Contact operation remote control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a contact interlocking remote operation control device for controlling on / off of a remote operation device such as a self-holding relay in conjunction with opening / closing of an external contact. .

[Prior Art] FIG. 2 is a circuit diagram including a conventional contact interlocking remote control device disclosed in, for example, Japanese Utility Model Publication No. 60-162346. In the figure, the contact-linked remote operation control device (10) forms a closed circuit including an AC power supply (3) together with an external contact (25) through an input terminal (7a, 7b, 7c) of a self-holding relay (4). Is connected to. The self-holding relay (4) is a pair of diodes (401, 402) provided in parallel in opposite directions.
The coil (405) is selectively connected to the coil (405) by a switch (403) which operates when the coil (405) is excited, and the main contact () is changed according to the change of the excitation state of the coil (405). 404) is opened and closed to control the application of the AC power supply (6) to the load (5). Remote operation by connecting switches (101a, 101b) to diodes (102a, 102b) provided in parallel in opposite directions between the input terminals (7a, 7b) of the contact-linked remote operation control device (10). The switch (100) is connected. Between the input terminals (7b) and (7c), the coil (20
1) is connected. Diodes (19a) and (19b)
Is connected to the common contact (2c) of the relay (2) and the anodes to the input terminals (7a) and (7b), respectively. In the thyristors (1a) and (1b), each cathode is connected to the input terminals (7b) and (7a), and each anode is connected to the fixed contacts (2a) and (2b) of the relay (2), respectively. The gate of the thyristor (1a) is connected to one end of the resistor (9a) and the gate resistor (11a), and the gate of the thyristor (1b) is connected to one end of the resistor (9b) and the gate resistor (11b). . Gate resistance (11a) and (1
The other end of 1b) is connected to the input terminals (7b) and (7a) respectively, and capacitors (8a) and (8b) are connected between the other end and the other ends of the resistors (9a) and (9b), respectively. Each is connected. At the other end of the resistors (9a) and (9b), a series body of a resistor (23a) and a diode (24a), and a resistor (23
b) and a diode (24b) are connected in series, and the anodes of the diodes (24a) and (24b) are connected to the anodes of the thyristors (1b) and (1a), respectively.

Next, the operation of the above conventional example will be described. Main contact (40
4) is open, the common contact (4c) of the switch (403) is connected to the fixed contact (4a), and the external contact (25) is open, in order from the AC power supply (3), the self-holding relay. (4), input terminal (7a), diode (19a), common contact (2c) of relay (2), fixed contact (2b), diode (24a), resistor (23a), capacitor (8a), input terminal ( A closed circuit is formed which returns to the AC power supply (3) through 7b), and a minute current (I ₁ ′) flows in the direction indicated by the solid arrow in the figure. This charges the capacitor (8a). When the external contact (25) is closed from this state, a current flows through the coil (201) of the relay (2), and the common contact (2
c) is switched to the connection with the fixed contact (2a). as a result,
Charging of the capacitor (8a) stops, and the accumulated charge is discharged according to the time constant determined by the capacitance of this capacitor (8a) and the resistance value of the resistor (9a), so the thyristor (1a) is triggered for a certain period of time. An electric current flows.
As a result, the thyristor (1a) becomes conductive and a new closed circuit is formed. That is, the diode (401), the fixed contact (4a), the common contact (4c), in order from the AC power supply (3),
Coil (405), input terminal (7a), diode (19a),
AC power supply (3) through common contact (2c), fixed contact (2a), thyristor (1a), input terminal (7b) of relay (2)
A closed circuit is formed back to. As a result, a relatively large current (I ₁ ) flows in the direction indicated by the solid arrow, so that the coil (405) is excited and the common contact (4c) of the switch (403) is switched and connected to the fixed contact (4b) side. , Main contact (40
4) is closed.

In the above state, in order from the AC power source (3), the input terminal (7b), the diode (19b), the common contact (2c) of the relay (2), the fixed contact (2a), the diode (24b), the resistor (23b). ), The capacitor (8b), the input terminal (7a), and the self-holding relay (4) to form a closed circuit that returns to the AC power supply (3), and a small current (I ₂ ′) is generated in the direction indicated by the dashed arrow in the figure. ) Flows. This charges the capacitor (8b). When the external contact (25) is opened from this state, the coil (201) of the relay (2) is not excited and the common contact (2c) is switched and connected to the fixed contact (2b) side. As a result, the charge of the capacitor (8b) is stopped, and the accumulated charge is discharged according to the time constant determined by the capacitance of the capacitor (8a) and the resistance value of the resistor (9b). ) Trigger current flows. In this way, the thyristor (1b) becomes conductive and the input terminal (7b) and the diode (19
b), relay (2) common contact (2c), fixed contact (2
b), thyristor (1b), input terminal (7a), coil (40
5), common contact (4c), fixed contact (4b), diode (4
A closed circuit that returns to the AC power supply (3) through 02) is configured. As a result, a relatively large current (I ₂ ) flows in the direction indicated by the dashed arrow, so the coil (405) is excited and the common contact (4c) of the switch (403) is fixed contact (4c).
The main contact (404) is opened by switching to the a) side. In this state, the capacitor (8a) is charged again, and thereafter, the main contact (404) alternately repeats closing / opening according to closing / opening of the external contact (25). In the above operation,
When the on-side switch (101a) of the remote control switch (100) is closed while the main contact (404) is open, the half-wave rectified current (I ₁ ) flows into the self-holding relay (4), and the main contact (40
4) is closed. When the off-side switch (101b) is closed while the main contact (404) is closed, the half-wave rectified current (I ₂ ) flows to the self-holding relay (4), and the main contact (404) is opened.

[Problems to be Solved by the Invention] In the conventional contact interlocking remote operation control device as described above, when the AC power supply (3) fails, the self-holding relay (4) is instantaneously returned according to the state of the external contact (25) when power is restored. ) Works.
However, when the state of the external contact (25) is switched before and after the power failure, a control signal different from that before the power failure is output after the power recovery.
The state of the main contact (404) changes. Further, when the self-holding relay (4) is driven to a state different from the states of the external contact (25) and the contact interlocking remote control device (110) by the operation of the remote control switch (100) before the power failure, for example, external Contact (25) and contact interlocking remote control device (110)
Is the state in which the main contact (404) should be closed, but the main contact (404) is preferentially operated by operating the remote control switch (100).
When the circuit is open, after the power is restored, the closing signal is output from the contact interlocking remote control device (110) against the intention of the operator who opened the main contact (404) with priority. The contact (404) is closed. That is, in any of the above cases, the self-holding relay (4) cannot maintain the state before the power failure after the power is restored. Therefore, there is a problem that uninterruptible equipment is required to maintain the state before the power failure after the power is restored.

In addition, in the above-mentioned conventional example, a full half-wave current (half-wave rectified current of a complete waveform, the same applies hereinafter) cannot flow in the coil (405) of the self-holding relay (4) due to the closing timing of the external contact (25). Sometimes. That is, a current from the middle of the waveform of one peak of the half-wave rectified current may flow to the coil (405), in which case chattering may occur at the common contact (4c) and the main contact (404). was there.

The present invention has been made to solve the above problems, and when the power is restored from the power failure, the state before the power failure is maintained, and the chattering is applied to the common contact (4c) and the main contact (404). It is an object of the present invention to provide a contact-linked remote operation control device that does not cause a noise.

[Means for Solving the Problems] A contact-linked remote operation control device according to the present invention should be configured as a closed circuit by being connected to an AC power source and a controlled device that changes its state depending on the direction of current flow. One switching element, a second switching element connected in parallel with the first switching element so that their polarities are opposite to each other, and connected to the AC power supply, and the first switching element is closed when the external contact is closed.
A first coil in which a current flows in one direction corresponding to the opposite direction of the switching element, and a second coil in which an unidirectional current corresponding to the opposite direction of the second switching element flows when the external contact is opened. A first contact point connected to the control pole of the first switching element, the first contact point connected so as to make the switching element conductive when a current flows through the first coil, and the second switching element A latching relay having a second contact, which is connected to the control pole and is connected so as to make the switching element conductive when a current flows through the second coil, the second contact interlocking with the first contact. Is.

[Operation] In the present invention, the latching relay performs the latching operation by the current in one direction of the AC power source according to the open / close state of the external contact, and maintains the state before the power failure even when the power is restored after the power failure. The switching element is rendered conductive by the first or second contact driven by the current flowing through the coil of the corresponding latching relay before the phase in which the current to be supplied arrives.

[Embodiment] FIG. 1 is a circuit diagram including a contact-linked remote operation control device according to an embodiment of the present invention. In the figure, the internal circuit of the contact operation remote control device (110) and its input terminal (7
The circuit configuration other than the connection of d) and the external contact (25) to the fixed contact (25a) side is the same as that of the conventional example, and therefore the same reference numerals are given and the description thereof is omitted. The contact-linked remote operation control device (110) has four input terminals (7a, 7b, 7c, 7d), and the polarities of the input terminals (7a) and (7b) are opposite to each other. In parallel with thyristors (1a) and (1
b) is connected. Between the input terminals (7b) and (7c), a coil (20a) of the latching relay and a resistor (6) for limiting the current flowing therethrough are connected in series, and a diode (14a) is provided at both ends of the coil (20a). ) Is connected. The diode (14) prevents the reverse current from flowing through the coil (20a) and the current through the other coil (20b) when the external contact (25) is closed. One end of the coil (20b) of the latching relay is connected to the connection point between the resistor (6) and the coil (20a) via the Zener diode (13), and the other end is connected to the input terminal (7
connected to d). A Zener diode (12) is provided on both ends of the coil (20b) to prevent a voltage exceeding the rated voltage from being applied to the coil (20b) and to prevent a reverse current from flowing through the coil (20b). ) Is connected. The Zener diode (13) prevents a voltage exceeding the rated voltage from being applied to the coil (20a) when the external contact (25) is closed, and also applies a current in a predetermined direction to the coil (20b). It is provided for shedding. The common contacts (21c) and (22c) of the latching relay are driven so as to interlock with each other according to the excitation states of the coils (20a) and (20b). That is, when the coil (20a) is energized, the common contact (21c) is connected to the fixed contact (21a) and the common contact (22c) is connected to the fixed contact (22a). When the coil (20b) is energized, the common contact (21
c) is connected to the fixed contact (21b), and the common contact (22c) is connected to the fixed contact (22b). A capacitor (8b) is provided between the common contact (21c) and the input terminal (7a), and a capacitor (8a) is provided between the common contact (22c) and the input terminal (7b).
Are connected respectively. Capacitors (8a) and (8
Discharge resistors (18a) and (18b) are connected to both ends of b), respectively. Resistors (9a) and (9b) are connected to the gates of the thyristors (1a) and (1b), respectively, and a parallel body of a capacitor (10a) and a resistor (11a) and a capacitor (10b) between each gate cathode. And the parallel body of the resistor (11b) are respectively connected. Between the input terminal (7b) and the fixed contact (22b) for voltage limitation of the capacitor (8a),
That is, a Zener diode (15a) is connected to the capacitor (8a) to prevent the voltage higher than the rated voltage from being applied. Similarly, a capacitor (8b) is placed between the input terminal (7a) and the fixed contact (21a). The Zener diode (15b) for voltage limitation is connected. A pair of voltage limiting Zener diodes (16a, 16b) are connected in series between the fixed contacts (21a) and (22b) with a resistor (17) in between. Zener diode (16a, 16b)
If the voltage applied between the input terminals (7a) and (7b) is less than the minimum operating voltage of the self-holding relay, the capacitor (8
a) and 8b) are provided to prevent charging, and the resistor (17) is provided to limit the current flowing through each zener diode (16a, 16b). In the above configuration, the coil (20a) and the thyristor (1a) are provided such that the directions in which currents flow should be opposite to the phase of the AC power supply (3). Coil (20
The same applies to b) and thyristors (1b).

Next, the operation of this embodiment will be described. Main contact (40
4) is open, the common contact (4c) of the switch (403) is connected to the fixed contact (4a), and the external contact (25) is open, the AC power supply (3) is input first Terminal (7d), coil (20b), Zener diode (1
Half-wave rectified current flows in the circuit returning to the AC power supply (3) through 3), the resistor (6) and the input terminal (7b). At the same time, a circuit that returns from the AC power supply (3) to the AC power supply (3) through the input terminal (7b), the resistor (6), the Zener diode (13), the Zener diode (12), and the input terminal (7d). Half-wave rectified current flows through. Current flows in the coil (20b) only in the forward direction, and current that attempts to flow in the reverse direction flows in the zener diode (12), so the coil (20b)
It does not flow to b). The common contacts (21c) and (22c) are connected to the fixed contacts (21b) and (22b), respectively, by the current flowing in the forward direction of the coil (20b). In this state, the capacitor (8a) is charged by the minute current (I ₁₁ ) flowing in the direction indicated by the solid arrow in the figure.

When the external contact (25) is closed, from the AC power supply (3),
A half-wave rectified current flows through the circuit that returns to the AC power supply (3) through the input terminal (7b), the resistor (6), the coil (20a), the input terminal (7c), and the external contact (25). At the same time, in order from the AC power supply (3), the external contact (25), the diode (14),
A half-wave rectified current flows in the circuit that returns to the AC power supply (3) through the resistor (6) and the input terminal (7b). At this time, the coil (20
No current flows in b) because the voltage applied across the zener diodes (12) and (13) is limited. In this way, a current flows only in the coil (20a) in the forward direction, so that the common contacts (21c) and (22c) are connected to the fixed contacts (21a) and (22a), respectively. As a result, the charging of the capacitor (8a) is stopped, the electric charge accumulated in the capacitor (8a) is discharged according to the time constant determined by the capacitance of the capacitor (8a) and the resistance (9a), and the thyristor (1a) is discharged for a certain period of time. Trigger current (I ₁₂ ) flows through. This trigger current (I ₁₂ ) causes the thyristor (1a) to conduct, and the self-holding relay (4), the input terminal (7a), the thyristor (1) in order from the AC power supply (3).
a), current (I ₁ ) flows through the circuit that returns to the AC power supply (3) through the input terminal (7b). At this time, the trigger current (I ₁₂ ) begins to flow before the phase in which the thyristor (1a) passes the current (I ₁ ), so that the thyristor (1a) passes the full half-wave current through the self-holding relay (4). The coil (405) of the self-holding relay (4) is excited thereby, connecting the common contact (4c) to the fixed contact (4b), and the main contact (404).
As a result, the load (5) is supplied with power from the AC power supply (6).

Next, in this state, a minute current (I ₂₁ ) flows in the same direction as the current (I ₂ ) and the capacitor (8b) is charged. Then, when the external contact (25) opens, a current flows through the coil (20b), and the common contacts (21c) and (22c) are connected to the fixed contacts (21b) and (22b), respectively. As a result, the charging of the capacitor (8b) is stopped, and the charge accumulated in the capacitor (8b) is discharged according to the time constant determined by the capacitance of the capacitor (8b) and the resistance (9b), and the thyristor (1b) is discharged for a certain period of time. Trigger current (I ₂₂ ) flows through.
This trigger current (I ₂₂ ) causes the thyristor (1b) to conduct, and the input terminal (7b), the thyristor (1b), the input terminal (7a), and the self-holding relay (4) in this order from the AC power supply (3).
A current (I ₂ ) flows through the circuit that returns to the AC power supply (3). At this time, the trigger current (I ₂₂ ) is the thyristor (1b)
Starts to flow before the phase in which the current (I ₂ ) flows, so the thyristor (1b) applies a full half-wave current to the self-holding relay (4). The coil (405) of the self-holding relay (4) is excited by it, connects the common contact (4c) to the fixed contact (4a), and opens the main contact (404), so from the AC power supply to the load (5). The power supply to the is stopped.

Next, in this state, a minute current (I ₁₁ ) flows again in the same direction as the current (I ₁ ) and charging of the capacitor (8a) starts.
In this way, each time the external contact (25) repeats closing and opening thereafter, currents (I ₁ ) and (I ₂ ) flow alternately, and the main contact (404) of the self-holding relay (4) closes and Repeat the open circuit.

In the above operation, if the ON-side switch (101a) of the remote control switch (100) is closed while the main contact (404) is open, the half-wave rectified current (I ₁ ) flows to the self-holding relay (4). Flow, the main contact (404) closes. Main contact (40
If the off-side switch (101b) is closed while the circuit of 4) is closed,
The half-wave rectified current (I ₂ ) flows into the self-holding relay (4), and the main contact (404) opens.

When the AC power supply (3) fails, the coils (20a) and (20
Since current does not flow in either of b), the connection between the common contact (21c) and the fixed contact (21a or 21b) and the connection between the common contact (22c) and the fixed contact (22a or 22b) are both Retain the state before the power failure.

At the time of power recovery from a power failure or initial power-on, the voltage applied between the input terminals (7a) and (7b) of the self-holding relay (4) is caused by the presence of the zener diodes (16a) and (16b). The charging of the capacitor (8a or 8b) is not started until the voltage returns to the minimum operating voltage or higher. The common contact (21c, 22c) of the latching relay does not operate unless the state of the external contact (25) has changed before and after power failure. If the state of the external contact (25) changes, the coil (20a or 20b) will change the common contact (21c, 22c) to the other fixed contact with only the first half wave of the half-wave rectified current that flows after power recovery. (2
1a or 21b, 22a or 22b), respectively, but this single wave alone does not allow the capacitor (8a or 8b) to charge enough charge to trigger the thyristor (1a or 1b). Therefore, when the power is restored or the power is turned on, the thyristor (1a or 1b) does not conduct, and the self-holding relay (4)
Holds the state before power failure or before power on. Only after the capacitor (8a or 8b) is charged with the electric charge necessary to trigger the thyristor (1a or 1b), the thyristor (1a or 1b) is triggered only by opening / closing the external contact (25), and the self-holding relay is activated. The main contact (404) of (4) is opened / closed. When the power is restored or the power is turned on, the thyristor (1a, 1
Since b) does not conduct, the remote control switch (10
Even if the main contact (404) is operated by (0), the main contact is restored after power recovery until the external contact (25) is newly opened / closed or the remote control switch (100) is opened / closed. (404)
Maintains the state before the power failure.

Although the contact-linked remote operation control device (110) connected to the self-holding relay has been described in the above embodiment, the same effect can be obtained when connected to the remote operation circuit breaker or other remote operation equipment.

Further, although the circuit configuration using the thyristors (1a, 1b) as the switching element is used in the above embodiment, the same effect can be obtained even if the transistor is used.

[Effects of the Invention] As described above, according to the present invention, the circuit is configured using the latching relay that latches with the current in one direction of the AC power supply (3) according to the open / close state of the external contact (25). Therefore, there is an effect that the state before the power failure can be maintained even when the power is restored after the power failure. Further, since the coils (20a, 20b) and the switching elements (1a, 1b) corresponding to the coils are provided so as to have polarities opposite to each other, a full half-wave current can flow through the switching elements, There is an effect that the control device can be operated stably.

[Brief description of drawings]

FIG. 1 is a circuit diagram including a contact interlocking remote operation control device (110) according to an embodiment of the present invention, and FIG. 2 is a circuit diagram including a conventional contact interlocking remote operation control device (10). In the figure, (1a, 1b) is a thyristor, (3) is an AC power supply, (4) is a self-holding relay, (20a, 20b) is a coil,
(21a, 21b) are fixed contacts, (21c) are common contacts, (22a, 22
b) is a fixed contact and (22c) is a common contact. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A first switching element which forms a closed circuit by being connected to an AC power source and a controlled device which changes its state depending on the direction of current flow, and the first switching element and the first switching element in parallel with each other. A second switching element connected so that the polarities are in opposite directions, and the first switching element connected to the AC power supply when the external contact is closed.
A first coil in which a current flows in one direction corresponding to the opposite direction of the switching element, and a second coil in which an unidirectional current corresponding to the opposite direction of the second switching element flows when the external contact is opened. A first contact point connected to the control pole of the first switching element, the first contact point connected so as to make the switching element conductive when a current flows through the first coil, and the second switching element A latching relay, which is connected to a control pole and has a second contact which is connected so as to make the switching element conductive when a current flows through the second coil and which interlocks with the first contact. Interlocking remote control device.