JPH01148036A - Switching circuit for remote control - Google Patents

Abstract

PURPOSE:To stabilize working and save power, by detecting the closing operation of a remote control switch means due to the fact that voltage between both ends comes to a specified value or less, with a detecting means. CONSTITUTION:A remote control switching circuit is composed of an AC power source 1, a remote control switch means 2, a switching means 4, and the like, and the switching of an air-conditioning motor or the like is controlled. In this case, a detecting means 3B is set in parallel with the automatic contact switch of said switch means 2, and is composed of a photo-coupler, a relay, and the like. Besides, a resistance circuit as a load means 7 is set. Then, by the detecting means 3B set in parallel with the remote control switch means 2, it is detected that voltage between both ends comes to a specified value or less, and the switching means 4 for coping with the means 3B is switching- controlled.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switching circuit for remote control, and particularly to a switching circuit for remote control used to turn ON/OFF a pump or an air conditioner motor. be.

[Prior Art] FIG. 3 is a circuit diagram showing a conventional remote control switching circuit. In the figure, (1) is an AC power supply, and (2) is a remote control switch means. An automatic contact switch (3) connected to one end of the AC power source (1) and installed at a remote location is connected to this automatic contact switch (2).
) and the other end of the AC power supply (1). That is, a series circuit consisting of an automatic contact switch (2) and a power relay (3) is connected in parallel to an AC power source (1). In addition, (4) is an opening/closing means,
In this conventional example, the power relay (3) is an output contact switch that turns on and off a controlled device such as a pump or an air conditioning motor, and is controlled to open and close by the power relay (3).

A conventional switching circuit for remote control is configured as described above, and when the automatic contact switch (2) is closed, the voltage of the AC power source (1) is applied to the power relay (3), and the power excited by the voltage is applied to the power relay (3). Relay (3) closes output contact switch (4).

When the automatic contact switch (2) is opened, the AC power supply (1)
) voltage is no longer applied, so the power relay (3)
is no longer energized, opening the output contact switch (4).

By the way, in the conventional switching circuit for remote control shown in FIG. 3, the electric wire from the power relay (3) to the automatic contact switch (2) is made of copper wire with a cross section M of 2 mva, for example.
f) When IV electric wires (600V vinyl electric TL) are closely connected in parallel for 500 m, a capacitance (5) of about 0.1 μF is generated between the electric wires.

This capacitance (5) has an impedance of about 30Ω at commercial frequencies. In this case, even if the automatic contact switch (2) is not closed, a voltage is induced in the power relay (3) and wasteful power is consumed. Therefore, the impedance of the power relay (3) decreases. Unless it is a sufficiently small value (less than or equal to Ω), stable operation of the remote control switching circuit cannot be expected, but it is not easy to reduce the impedance of the power relay (3).

FIG. 4 is a circuit diagram showing another conventional switching circuit for remote control; (1) and (4) are exactly the same as those of the conventional switching circuit for remote control; in FIG. 0, (2a) and (2b) are remote control switch means, in this conventional example, an a contact switch and a b contact switch installed at a remote location, and (6) are other controlled devices such as a power relay (3^). This is an output contact switch, and is connected in parallel to the a contact switch (2a). B contact switch (2b), A contact switch (2a)
The power relays (3^) are connected in series with each other and then connected in parallel with the AC power source (1).

Another conventional remote control switching circuit is configured as described above, and when the a contact switch (2a) is opened,
The voltage of the AC power supply (1) is applied to the power relay (3^), and the power relay (3^) is excited by the above voltage.
closes the output contact switches (4) and (6). Note that even after the a-contact switch (2a) is opened, the output contact switch (6) remains closed, so the voltage of the AC power source (1) continues to be applied to the power relay (3^).

When the b contact switch (2b) is opened, the AC power supply (1
) is no longer applied, so the power relay (3^
) is no longer energized, opening output contact switches (4) and (6).

In another conventional remote control switching circuit shown in Fig. 4, a contact switch (2) is connected from a power relay (3^) to
For example, if IV wire (600mm vinyl wire) with a cross-sectional area of copper wire of 21 mm is used for the wires up to a) and b contact switch (2b), and the wires are wired closely in parallel with each other, there will be a This generates an electrostatic capacitance jt(5) of about 0.1 μF as described above with reference to FIG. 3, which makes the operation of the other remote control switching circuit unstable and wastes power.

[Problems to be Solved by the Invention] In the conventional remote control switching circuit as described above, there is Due to the capacitance (5) generated between the wires, voltage is induced in the power relay (3) or (3^) even if the automatic contact switch (2) or the A contact switch (2a) is not closed. This has the problem of unstable operation and wasteful power consumption.

This invention has been made to solve these problems, and aims to provide a switching circuit for remote control that can stabilize operation and save power. .

Means for Solving Problem U] The remote control switching circuit according to the present invention includes a remote control switch means installed at a remote location, a load connected in series to the remote control switch means and having a predetermined impedance. means, an AC power supply connected in parallel to a series circuit consisting of the remote control switch means and the load means, and a detection means connected in parallel to at least a part of the remote repetition switch means for detecting the voltage across the same. It is equipped with the following.

[Function] In the present invention, the detection means connected in parallel to at least a part of the remote control switch means and detecting the voltage across the switch means detects the voltage across the remote control switch when the voltage falls below a predetermined value. It is detected that the switch means is operated to close, and the corresponding opening/closing means is controlled to open or close.

[Embodiment] FIG. 1 is a circuit diagram showing an embodiment of the present invention.
), (2) and (4) are exactly the same as those of the conventional remote control switching circuit described above.
B) is a detection means, in this embodiment, a voltage detection device composed of, for example, a photocoupler, a relay, etc. connected in parallel to the automatic contact switch (2), and (7) is a load means, in this embodiment 1 is a resistance circuit connected between the automatic contact switch (2) and the voltage detection device (3B) and the other end of the AC power source (1).

In the remote control switching circuit configured as described above, when the automatic contact switch (2) is in the open state, the impedance of the resistance circuit (7) is set to 100Ω, for example,
And from the voltage detection device (3B) to the automatic contact switch (2)
If the impedance between the wires is set to 30Ω as described above, and the AC power supply (1) is 200Ω, a voltage of approximately 46V will be generated between both ends of the voltage detection device (3B).

When the automatic contact switch (2) is opened, the AC power supply <1
) is no longer applied to the voltage detection device (3B),
The voltage between both ends becomes almost zero. This voltage detection device (3B) detects that the automatic contact switch (2) has been closed when the voltage falls below a predetermined value (for example, 5■).
Open the output contact switch (4).

When the automatic contact switch (2) is opened, the AC power supply (1)
) is applied to the voltage detection device t(3B), and the voltage across it is approximately 46V. Therefore, this voltage detection device (3B) opens the output contact switch (4).

FIG. 2 is a circuit diagram showing another embodiment of the present invention, (
1), (2a), (2b) and (6) are exactly the same as those of the other conventional remote control switching circuits mentioned above. A voltage detection device connected in parallel to the output contact switch (6) and composed of a photocoupler, a relay, etc.
)^) is a load means, which in this embodiment is a parallel circuit consisting of an a contact switch (2a), an output contact switch (6), and a voltage detection bag g (3e), and the other end of the AC power supply (1). A power relay is connected between the two. However, the output contact switch (6) is another controlled device of the voltage detection device (3C). Note that (4a) and (4b) are opening/closing means, which in this embodiment are voltage detection bags! (3C)
and power relay (7^), each of which is a controlled device such as an output contact switch, and is controlled to open/close by the voltage detection device (3C) and power relay (7^).

In the remote control switching circuit configured as described above, when the a contact switch (2a) is open, the impedance of the power relay (7^) is set to 100Ω, for example.
And a voltage detection device! If the impedance between the wires from (3C) to the a contact switch (2a) and the b contact switch (2b) is set to 30Ω as described above,
If the AC power supply (1) is 200V, voltage detection device Z (3
A voltage of approximately 46V is generated across C). Further, a voltage of approximately 154V is applied between both ends of the power relay (7^), and this power relay (7^) is excited by the voltage to open the output contact switch (4b).

When the a contact switch (2a) is closed, the AC power supply <1
) voltage is no longer applied to the voltage detection device (3C),
The voltage across it will be approximately zero volts. When the voltage falls below a predetermined value (for example, 5V), this voltage detection device F (3C) assumes that the a-contact switch (2a) has been closed and closes the output contact switches (4a) and (6). do. Note that even after the a-contact switch (2m) is opened, the output contact switch (6) remains closed, so the voltage across the voltage detection device (3C) is maintained at zero V.

When the b contact switch (2b) is opened, the AC power supply (1
) voltage is no longer applied to the power relay (7^),
This power relay ()^) is the output contact switch (4b)
Open.

Although the impedance of the voltage detection devices (3B) and (3C) was not mentioned in the above two embodiments, the impedance of the voltage detection devices (3B) and (3C) is sufficiently smaller (for example, Ω or less) than the impedance of the capacitance (5) between the wires. Well, the voltage detection device! (
The voltage across terminals 3B) and 3C is less affected by the capacitance (5) on the wire surface, and a more stable switching circuit for remote control can be constructed.

In addition, in the above two embodiments, a voltage detection device and a power relay are shown as control devices, and an output contact switch (contact switch) is shown as a controlled device, but semiconductor elements such as solid relays and non-contact switches are used to control and control It goes without saying that the intended purpose can be achieved even if the control equipment is configured.

[Effects of the Invention] As explained above, the present invention includes a remote control switch means installed at a remote location, a load means connected in series to the remote control switch means and having a predetermined impedance, and the remote control switch means. By providing an AC power supply connected in parallel to a series circuit consisting of the above-mentioned load means and the above-mentioned load means, and a detection means connected in parallel to at least a part of the above-mentioned remote control switch means for detecting the voltage between both terminals, the operation can be improved. This has the effect of being able to measure stabilization and power saving.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing one embodiment of the present invention, Fig. 2 is a circuit diagram showing another embodiment of the invention, Fig. 3 is a circuit diagram showing a conventional remote control switching circuit, and Fig. 4 is a circuit diagram showing an embodiment of the present invention. FIG. 2 is a circuit diagram showing another conventional remote control switching circuit. In the figure, (1) is an AC power supply, (2) is an automatic contact switch (remote control switch means), (3B) is a voltage detection device (detection means), (4) is an output contact switch (opening/closing means), ( 7) is a resistance circuit (load means). (2a) and (2b) are a contact switch and b contact switch (remote control switch means), (3C) is a voltage detection device (detection means), (4a) and (4b) are output contact switches (opening/closing means) , (6) is an output contact switch, and (78) is a power relay (load means). In addition, the same reference numerals in each figure indicate the same or equivalent parts.

Claims (5)

[Claims] (1) A remote control switch means installed at a remote location, a load means connected in series to the remote control switch means and having a predetermined impedance, and a series circuit consisting of the remote control switch means and the load means. It includes an AC power source connected in parallel, and a detection means connected in parallel to at least a part of the remote control switch means for detecting the voltage between both ends thereof, and this detection means controls the opening and closing of the corresponding opening/closing means when the detection means is operated. A remote control switching circuit characterized by: (2) The remote control switch means is an automatic contact switch, the detection means is a voltage detection device that becomes operational when the voltage across the remote control switch means is below a predetermined value, and the load means is a resistor. The remote control switching circuit according to claim 1, which is a circuit. (3) The remote control switch means is composed of an A contact switch and a B contact switch connected in series, and the detection means is connected in parallel to the A contact switch and is activated when the voltage between both ends thereof is below a predetermined value. It is a voltage detection device, and the load means is a power relay that becomes operational when the voltage across the device is equal to or higher than a predetermined value, and the voltage detection device includes an output contact switch that self-maintains the operating state of the voltage detection device. 2. The remote control switching circuit according to claim 1, wherein the switching circuits are connected in parallel. (4) Claims characterized in that the detection means is a solid relay that is activated when the voltage across the remote control switch means is below a predetermined value, and the opening/closing means is a non-contact switch. The remote control switching circuit according to item 1. (5) The remote control switching circuit according to any one of claims 1 to 4, wherein the detection means has low impedance.