JPH10271662A - Contact control system and equipment controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use one relay contact both as the relay contact for leakage break and that for output control so as to reduce the cost, by enabling each of individual contacts to be opened and closed according to the drive and nondrive of load excluding the time of leakage on one side, and enabling it to be driven to open side at the time of leakage on the other. SOLUTION: If leakage occurs between it and the ground at the time of nondrive of a circulating pump 15, and a voltage corresponding to this with a zero-phase current transformer 23 is given to a leakage detection circuit 24, and a drive transistor 25 is turned on, and the output side of a first and a third inverters 27 and 30 is earthed. In this case, the circulating pump 15 is in operation, and a high level of switching drive signals S1 and S2 outputted from a first and a second output parts 26a and 26b are dropped to earth side, and are not applied to a first and a second relay coils 29 and 32, and a first and a second relay contacts 35 and 36 are opened, and the circulating pump 15 is broken from an AC power source. Hereby, as the number of contacts, only two will do, and the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a contact control system and a device controller.

[0002]

2. Description of the Related Art In general, for example, a jet bath controller as a device controller circulates hot and cold water in a jet bath by driving a circulation pump, and controls jetting of hot and cold water from a plurality of bubble jet ports on the side surface of the jet bath. Has become. In such a jet bath controller, it is necessary to cut off the power supply line, which is a power supply line for driving the circulating pump, as soon as an electric leakage occurs. Have.

[0003] A conventional contact control system in such a jet bath controller is described with reference to FIG. A zero-phase current transformer 4 is provided on a pair of power lines 3 between the circulating pump 1 and the AC power supply 2. 4 has no voltage output from the zero-phase current transformer 4 in a state where no current flows apparently, but when a current leaks between the circulating pump 1 and the ground due to water or the like and a leakage occurs, each power line 3 A voltage is generated due to the difference between the currents flowing therebetween, and the voltage is output from the zero-phase current transformer 4 as a leakage voltage. The leakage detection circuit 5 outputs a leakage detection output to the relay coil 6 in response to the input of the leakage voltage. The relay coil 6 is energized by the detection output from the electric leakage detection circuit 5,
The relay contact 7 for leakage control, which is a 2b contact inserted into the power supply line 3, is driven to the open side. As a result, the power supply line 3 is cut off, and the supply of the AC power supply 2 to the circulation pump 1 is cut off.

[0004] The supply of the AC power supply 2 and the supply of the AC power supply 2 to the circulating pump 1 in which the supply of the AC power supply 2 is cut off in the event of an electric leakage in response to a hand operation of a bather to use the bathtub as a jet bath, for example, Output control relay contact 8 which is a 2a contact on the power supply line 3 for controlling the stop of the operation.
In response to a control output from the control circuit 9, the relay coil 10 is energized in response to a control output from the control circuit 9 so that the relay contact 8 can be driven to the closed side so that the circulating pump 1 is supplied with the AC power supply 2 and can be driven. There is something like that.

[0005]

In the above-described contact control system, the output control relay contact 8 of the 2a contact type and the earth leakage control relay contact 7 of the 2b contact type are required. In addition to the increase in cost as a system, an expensive 2b contact is required as the leakage control relay contact 7, which also causes a problem in that the cost of the system is increased.

Although the output control relay contact 8 is a 2a contact, it must be driven at the same time. However, due to the mechanical structure, the output control relay contact 8 is not completely driven at the same time. There is a problem in that the contact life of one of the contacts is shortened by the drive to the open side and the drive to the circulation pump and the non-drive repeatedly.

[0007]

In the contact control system according to the present invention, individual contacts are provided for each of a plurality of power supply lines connecting a power supply and a load, and each of the individual contacts is connected to the power supply line except at the time of earth leakage. The above-described problem is solved by enabling the drive to be opened and closed according to the drive and non-drive of the load, and to be able to drive to the open side at the time of leakage.

In the device controller of the present invention, the load is connected to an AC power supply via a pair of power supply lines, and individual contacts that can be individually opened and closed are provided on each of the pair of power supply lines. The above problem is solved by the contact control system according to any one of claims 1 to 4, wherein the contact control system is driven to open and close in response to driving of the load and occurrence of leakage.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. Although the present invention is described as being applied to a jet bath controller as a device controller, the present invention is not limited to this jet bath controller alone.

FIG. 1 shows a jet bath controller as a device controller to which the contact control system of the present invention is applied. A jet bath 12 is provided in a bathroom 11. The jet bath 12 has a bubble jet port 13. The bubble outlet 13 is connected to a circulation pump 15 via a pipe 14. The circulation pump 15 circulates the hot water in the jet bath 12 as described above, and makes the hot water into a bubble state from the bubble jet port 13 and jets the hot water. The solenoid 16 is turned on and off in order to adjust the strength of the bubbles from the bubble jet port 13 in response to a command from the microcomputer in the control box 17. AC power is supplied to the circulation pump 15, the solenoid 16, and the control box 17 via a power supply line 18. The control box 17 is connected to a remote controller 21 which is disposed on the ceiling outer surface 19 of the bathroom 11 and is operated by a bather in the jet bath 12 via a wire 20 buried in the bathroom wall. The remote controller 21 is attached to the bathroom wall, and outputs an operation signal to the control box 17 by a hand operation by a bather. The control operation in the control box 17 enables the operation, stoppage, and strength of the jet bath 12 to be controlled. ing.

A contact control system according to the present embodiment in the whirlpool controller shown in FIG. 1 will be described with reference to FIG. In the contact control system according to the present embodiment, a zero-phase current transformer 23 is inserted into a power supply line 18 that connects a circulating pump 15 and an AC power supply 22. Since the operation of the zero-phase current transformer 23 has been described above, its description is omitted. Zero-phase current transformer 2
3 and outputs the above-described leakage detection output when a leakage occurs. The drive transistor 25 as a switch element has its base connected to the leakage detection circuit 24, and is turned on by a high-level detection output at the time of leakage from the leakage detection circuit 24. The control circuit 26, which is a microcomputer in the control box 17, has a first output section 26a and a second output section 26b.
b outputs a low-level opening / closing drive signal when the circulation pump 15 is not driven, and outputs a high-level opening / closing drive signal when the circulation pump 15 is driven. The first output section 26a of the control circuit 26 includes a first inverter 27, a second inverter 28, and a first relay coil 2
Nine series circuits are connected. The third inverter 30 and the fourth inverter 3 are connected to the second output section 26b of the control circuit 26.
A series circuit of the first and second relay coils 32 is connected. The connection between the first and second inverters 27 and 28 is connected via a backflow prevention diode 33 to the drive transistor 25.
Connected to the collector. The connection between the third and fourth inverters 30 and 31 is connected to the collector of the drive transistor 25 via a backflow prevention diode 34.

Each of the power supply lines 18 is connected to first and second relay contacts 35 and 36, each of which is a 1a contact driven to a closing side by a corresponding relay coil 29 and 32, as individual contacts that can be individually opened and closed. Have been.

In the present embodiment, the control circuit 26 constitutes a control means for controlling and outputting an open / close drive signal corresponding to each of the relay contacts 35 and 36 as individual contacts, and comprises inverters 27, 28, 30, 31 and a relay. Coil 29,
A drive means 32 individually drives the relay contacts 35, 36 to open and close in response to the open / close drive signal. The zero-phase current transformer 23, the leakage detection circuit 24, the transistor 25, and the backflow prevention diodes 33, 34 constitute a leakage circuit. , A signal processing means for processing the open / close drive signal so as to open the relay contacts 35 and 36 when it is detected.

The operation of the above-described contact control system according to the present embodiment will be described with reference to FIG.

(1) When the circulating pump 15 is not driven: a, when the circulating pump 15 is not driven and when there is no leakage, the control circuit 26 outputs a low-level opening / closing drive signal S1, to each of the output units 26a and 26b. S2 is output. Accordingly, the first and second output coils 26a and 26b output the low-level open / close drive signals S1 and S2, respectively, so that the first and second relay coils 29 and 3 are output.
2 is not energized and the first and second relay contacts 35, 36
Remains open, and the circulating pump 15
Is not supplied, and the jet bath 12 is in the jet bath non-driving mode in which no air bubbles are jetted from the air bubble jet port 13.

When a leakage occurs between the circulation pump 15 and the ground when the circulation pump 15 is not driven, a voltage corresponding to the leakage is supplied to the leakage detection circuit 24 by the zero-phase current transformer 23. From the leakage detection circuit 24
From the high level leakage detection output is the drive transistor 2
5 to turn on the drive transistor 25. When the drive transistor 25 is turned on, the output side of each of the first and third inverters 27 and 30 is grounded via the backflow prevention diodes 33 and 34 and the collector / emitter of the transistor 25. Since the open / close drive signals S1 and S2 at low level are output from the first and second output units 26a and 26b, respectively, during the non-drive time, the first and second relay contacts 35 and 36 remain open. There is no change.

(2) When the circulating pump 15 is driven: When the circulating pump 15 is driven and when there is no leakage, the control circuit 26 outputs high-level opening / closing drive signals S1 and S2, and outputs first and second output sections. The first and second relay coils 29 and 32 are energized by the output of the high-level open / close drive signals S1 and S2 from the respective 26a and 26b, and the first and second relay contacts 35 and 36 are closed. An AC power supply 22 is supplied to the circulation pump 15,
Bubbles are jetted from the jet port 13 into the jet bath 12, and the jet bath 12 is in the jet bath drive mode.

When a leakage occurs between the circulation pump 15 and the ground when the circulation pump 15 is not driven, a voltage corresponding to the leakage is supplied to the leakage detection circuit 24 by the zero-phase current transformer 23. From the leakage detection circuit 24
From the high level leakage detection output is the drive transistor 2
5 to turn on the drive transistor 25. When the drive transistor 25 is turned on, the output side of each of the first and third inverters 27 and 30 is grounded via the backflow prevention diodes 33 and 34 and the collector / emitter of the transistor 25. When driving, the first
The high-level open / close drive signals S1 and S2 output from the first and second output units 26a and 26b, respectively, are dropped to the ground side, so that the first and second relay coils 29 and 32 are not energized, and the first and second relay coils 29 and 32 are not energized. The second relay contacts 35 and 36 are open, and the AC power of the circulation pump 15 is cut off.

As described above, in the contact control system according to the present embodiment, the relay contacts 35 and 36, which are inexpensive 1a contacts, are used as the relay contacts for opening and closing for controlling the output of the circulating pump 15 and for controlling the earth leakage. Only two points are required, and there is no need to use four expensive 2a contacts and 2b contact relay contacts for output control and leakage control as in the prior art. Costs can be reduced.

Next, in this embodiment, both relay contacts 35 and 36 are individually connected to both relay coils 29 and
When the circulating pump 15 is driven at an arbitrary time, the first opening / closing drive signal S1 is output from the first output portion 26a of the control circuit 26 earlier by the time T as shown in FIG. From the second output unit 26b to the second opening / closing drive signal S2
Then, when the circulating pump 15 is driven at a time after the arbitrary time, the second opening / closing drive signal S2 is output first by the time T and then the first opening / closing drive signal S1 is output. Has become. Therefore, the first relay contact 35 and the second relay contact 36 are alternately opened and closed, respectively, so that only one of the relay contacts is not always driven first as in the related art. And the contact life is greatly extended.

In the above-mentioned embodiment, the alternate opening and closing driving of the relay contacts 35 and 36 alternately includes not only the opening and closing driving of each time but also the opening and closing operation of every several times. The open / close drive signal from the control circuit 26 is also shown in FIG.
In addition to the relationship shown in FIG. 5, the relationship between the open / close drive signals S1 and S2 may be repeated a plurality of times after the relationship between the open / close drive signals S1 and S2 is repeated a plurality of times.

[0022]

As described above, according to the present invention, the following effects can be obtained.

According to the contact control system of the first aspect of the present invention, individual contacts are provided on each of a plurality of power supply lines for connecting a power supply and a load, and each of the individual contacts is connected to the load except when a short circuit occurs. While opening and closing can be driven according to driving and non-driving, it can be driven to the open side at the time of leakage, so that one relay contact can be used as one relay contact for leakage interruption and output control. In addition, there is no need to use an expensive relay contact of the b-contact type for interrupting the earth leakage as in the related art, and the system can be reduced in cost accordingly.

According to the contact control system of the second aspect of the present invention, since the individual contacts can be alternately opened and closed by shifting the timing, the contact life can be greatly extended.

According to the contact control system of the third aspect of the present invention, in addition to the effects of the first aspect of the present invention, in addition to the control means for controlling and outputting a switching drive signal corresponding to each of the individual contacts, A drive unit that individually opens and closes each of the individual contacts in response to an open / close drive signal; and a signal processing unit that processes the open / close drive signal so as to open both of the individual contacts when leakage is detected. A simple circuit configuration is sufficient.

According to the contact control system of the fourth aspect of the present invention, since each of the individual contacts is a 1a contact, the contact can be used inexpensively, and the cost of the system can be reduced accordingly.

According to the apparatus controller of the present invention, the load is connected to an AC power supply via a pair of power supply lines, and each of the pair of power supply lines is provided with an individual contact which can be individually opened and closed. Claims 1 to 4 each of the individual contacts
The contact control system according to any one of the above, the opening and closing drive according to the drive of the load and the occurrence of leakage due to the load, for example, when the load is implemented as a circulating pump in a jet bath controller, cost reduction as the system Can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a jet bath controller to which a contact control system according to an embodiment of the present invention is applied.

FIG. 2 is a circuit diagram of a contact control system according to the embodiment.

FIG. 3 is a timing chart for explaining the operation of the contact control system according to the embodiment;

FIG. 4 is a circuit diagram of a conventional contact control system.

[Explanation of symbols]

 Reference Signs List 15 circulation pump 18 power supply line 22 AC power supply 23 zero-phase current transformer 24 leakage detection circuit 25 drive transistor 26 control circuit 26a, 26b output unit 27, 28, 30, 31 inverter 29, 32 relay coil 35, 36 relay contact

Claims (5)

[Claims] An individual contact is provided for each of a plurality of power supply lines connecting a power supply and a load, and each of the individual contacts is
A contact control system characterized in that it can be driven to open and close according to the drive and non-drive of the load except at the time of leakage, and can be driven to the open side at the time of leakage. 2. The contact control system according to claim 1, wherein each of said individual contacts can be alternately driven to open and close by shifting the timing. 3. A control means for controlling and outputting an open / close drive signal corresponding to each of said individual contacts, a drive means for individually opening / closing each of said individual contacts in response to each of said open / close drive signals, and 3. The contact control system according to claim 1, further comprising: signal processing means for processing the open / close drive signal so as to open the two individual contacts upon detection. 4. The contact control system according to claim 1, wherein each of said individual contacts is a 1a contact. 5. A load is connected to an AC power supply via a pair of power supply lines, and each of the pair of power supply lines is provided with an individual contact that can be individually opened and closed, and each of the two individual contacts is connected.
A device controller, wherein the contact control system according to any one of claims 4 to 4 performs opening / closing driving according to driving of the load and occurrence of leakage.