JPH06108508A - Automatic water supply control device - Google Patents

Abstract

(57) [Summary] [Purpose] Immediately stop water in the event of a power failure. [Structure] 1 for 1 mSec for microcomputer 12
It is checked whether or not the pulse Pc is input at a rate of times. When it is determined that the pulse Pc has not been input, it is determined whether the time measured by the timer is 100 mSec or more. If the state in which the pulse Pc is not input is less than 100 mSec, it is determined that there is no power failure, and the process returns to the main routine. When it is 100 mSec or more, it is determined that a power failure has occurred, and if the valve is open at that time, a valve closing signal is output. The driver 14 receiving this valve closing signal
The solenoid valve 15 is closed by the discharge current of the capacitor 5. [Effect] The automatic valve closing operation of the valve device in the event of a power outage can be performed quickly and reliably, which can prevent wasteful consumption of water and prevent the automatic valve closing. The structure of can be simplified as much as possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic water supply control device suitable for applications such as automatically performing a cleaning operation of a urinal.

[0002]

2. Description of the Related Art An automatic flushing device having a structure for detecting whether or not a urinal is used and for cleaning the urinal based on the detection result is widely used.

This kind of automatic flushing device is usually provided with a human body detection sensor in the vicinity of the urinal, and when this sensor detects a person standing in front of the urinal and then becomes a non-detection state (that is, (When a person who has finished using it leaves the urinal)
In addition, the urinal is configured to allow water to flow for a certain period of time through a valve device. In this case, as the valve device,
For the purpose of suppressing power consumption, etc., it is possible to use a solenoid valve that has a latch function that opens and closes the valve in response to a short-time energization and holds each operating state even after the power is cut off. It is being appreciated.

[0004]

In the case of the above conventional configuration,
When a power failure occurs in the valve open state of the valve device, the valve open state, that is, the water discharge state will continue,
This causes a problem that a large amount of water is wasted. In order to deal with such a problem, a power failure detection device that detects a power failure condition and a backup power supply that closes the valve device in the detected condition should be provided. Since a separate power supply is required, it is inevitable that the overall structure will be greatly complicated.

The present invention has been made in view of the above circumstances, and an object thereof is to use a valve device having a latch function for holding a valve open state or a valve closed state even after the power is cut off. On the other hand, it is an object of the present invention to provide an automatic water supply control device that can quickly and surely automatically close a valve device when a power failure occurs and prevent wasteful consumption of water.

[0006]

SUMMARY OF THE INVENTION An automatic water supply control apparatus of the present invention has a DC power supply circuit for rectifying and smoothing the output of a commercial AC power supply, and a valve opening operation and a valve closing operation when energized by the DC power supply circuit. A valve device having a latch function for holding each operating state even after the power is cut off, and a control device for performing a water supply operation by controlling the opening / closing operation of the valve device based on an external signal. In the automatic water supply control device, a signal generating means for outputting a pulse signal having a proportional relationship with the output cycle of the commercial AC power supply, and the output of the pulse signal are counted every predetermined time for a fixed measurement time, and during this period. A power failure detection means for outputting a power failure detection signal when the number of pulses becomes equal to or less than a reference number, and the control device is configured to perform a valve closing operation of the valve device based on the power failure detection signal. And it is characterized in that it is.

[0007]

In the non-power failure state, the signal generating means outputs the pulse signal proportional to the output cycle of the commercial AC power supply at a constant cycle, and the number of pulses counted during the measurement time becomes equal to or less than the reference number. There is no such thing. Therefore, the power failure detection means does not output the power failure detection signal. On the other hand, when a power failure occurs, the output of the pulse signal is stopped, so the number of pulses counted during the measurement time becomes less than the reference number, and the power failure detection signal is output from the power failure detection means. It Then, the control device performs the valve closing operation of the valve device, and the power for this valve closing operation is supplied by the energy stored in the smoothing function portion of the DC power supply circuit. Further, in this case, the measurement time can be set to a very short time of about several cycles or ten and several cycles of the output cycle of the commercial AC power supply, so that the power failure detection signal can be quickly generated.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

The output of the commercial AC power supply 1 is the step-down transformer 2
Is supplied to the DC power supply circuit 3 via. The DC power supply circuit 3 has a well-known configuration including a full-wave rectification circuit 4 and a smoothing capacitor 5, and a DC voltage obtained by rectifying and smoothing the secondary output of the step-down transformer 2 is supplied to a line L and a ground terminal. It is designed to output in the meantime.

In this case, in this embodiment, the full-wave rectification circuit 4
And a diode 6 for preventing backflow between the smoothing capacitor 5 and
And a waveform shaping circuit 7 serving as a signal generating means.
Is adapted to obtain a signal input from the anode side of the diode 6 and a power source input between the line L and the ground terminal.

Specifically, the waveform shaping circuit 7 has an npn-type transistor 8 having an emitter connected to a ground terminal, and the base of the npn-type transistor 8 is connected through a resistor 9 and a constant voltage diode 10 having the polarity shown in the figure to the diode 6 described above. Is connected to the anode side and the output terminal collector is connected to the line L via the resistor 11. At this time, the Zener voltage Vzd of the constant voltage diode 10 is set to be lower than the peak value of the full-wave rectified voltage Vdc output from the full-wave rectifier circuit 4, as shown in FIG.

Therefore, the transistor 8 is turned on each time the constant voltage diode 10 breaks through as the output voltage Vzd of the full-wave rectifier circuit 4 rises, and accordingly the collector of the transistor 8 is turned on. A pulse signal Pc having a constant period T (see FIG. 2B) is output. In this case, since the output of the commercial AC power supply 1 is full-wave rectified, the cycle T of the pulse signal Pc is half the cycle of the output voltage of the commercial AC power supply 1. When the commercial AC power supply 1 is 50 Hz, T = 10
(Msec), T = 8.33 (msec) in the case of 60 Hz. The peak voltage of the pulse signal Pc is the line L
And becomes equal to the voltage level Va between the ground terminals.

The microcomputer 12 as a power failure detecting means for receiving the output of the waveform shaping circuit 7 is connected so as to obtain power from the line L and the ground terminal.

The microcomputer 12 has a well-known structure and includes a ROM, a RAM, a CPU, an input / output device, a data bus and the like. A human body detection signal is input to the microcomputer 12 from a human body detection sensor 13. The microcomputer 12 can output a control signal to a driver (drive circuit) 14 of the solenoid valve 15.

The solenoid valve 15 is energized from the line L via the driver 14. The solenoid valve 15 alternately performs a valve opening operation and a valve closing operation each time it is energized for a short time, and each operation is performed after the power is cut off. It is configured to have a latch function for holding the state. When the electromagnetic valve 15 is opened, water is supplied to the urinal (not shown) to perform the cleaning operation. Further, the sensor 13 is arranged, for example, at a position above the urinal so as to output a detection signal in a state of detecting a person standing in front of the urinal.

Therefore, the microcomputer 12 is
As shown in FIG. 3, when the detection signal Sm from the sensor 13 is continuously input for a predetermined period of time or more and then becomes a non-input state (that is, when the person who has been sufficiency leaves the urinal), the solenoid valve 15 Is opened through the driver 14 and the solenoid valve 15 is closed through the driver 14 when a set time has elapsed after that, so that water is made to flow through the urinal for a certain period of time. ing.

Further, the microcomputer has a solenoid valve 2
When a power failure is detected when 0 is open, the subroutine shown in FIG. 4 is executed to close the solenoid valve 15 through the driver 14 as follows.

That is, in the state where the main routine shown in FIG. 3 is being executed, it is checked according to the subroutine of FIG. 4 whether or not the pulse Pc is input once per 1 mSec. In this case, the pulse is 15 μSec
When continuing the above, it is determined that the pulse Pc is input, the timer is reset, and the process returns to the main routine.
For pulse input shorter than 15 μSec,
This is regarded as a pulse due to noise, and the regular pulse Pc
Is treated as if there was no input.

When it is determined that the pulse Pc has not been input, it is determined whether or not the time measured by the timer is 100 mSec or more. 100 mSe when no pulse Pc is input
If it is less than c, it is determined that there is no power failure, and the process returns to the main routine. When it is 100 mSec or more, it is determined that a power failure has occurred, and if the valve is open at that time, a valve closing signal is output.

The driver 14, which receives the valve closing signal, closes the solenoid valve 15 by the emission current of the capacitor 5.

It should be noted that the above-mentioned time settings are all examples of the present invention. The pulse duration is 15μ
Sec is preferably selected from 5 to 30 μSec, and the pulse check cycle 1 mSec is 0.5 to 2
The pulse-free duration of 100 mSec is preferably selected from the range of 20 to 150 mSec.

According to the present embodiment configured as described above, when a power failure occurs in the open state of the solenoid valve 15, the solenoid valve 15 is immediately closed by the charge of the capacitor 5 in the DC power supply circuit 3. Therefore, the open state of the solenoid valve 15, that is, the water discharge state does not last unintentionally for a long time as in the conventional case, so that a large amount of water is not wasted. .

The power supply for closing the solenoid valve 15 when a power failure occurs is obtained from the charge charged in the capacitor 5 in the DC power supply circuit 3 originally provided, so that a backup power supply is separately provided. It is not necessary to provide it, and the entire structure can be simplified.

In the above-described embodiment, the solenoid valve 15 is used as the valve device, but an electrically operated valve having a motor as a drive source may be used.

In the above-mentioned embodiment, it is judged that there is a power failure when no pulse is counted within the measurement time. That is, the "reference number" is set to 0, but the reference number may be set to 1 or more in the present invention.

[0026]

According to the present invention, the output of the pulse signal proportional to the output cycle of the commercial AC power supply is counted every predetermined time for a fixed measurement time, and the number of pulses during this time is less than the reference number. When a power failure occurs, a power failure detection means is provided to output a power failure detection signal, and the valve operation is closed based on this power failure detection signal. In addition, it is possible to surely perform, and it is possible to prevent the wasteful consumption of water in advance, and it is possible to achieve the excellent effect that the structure for the automatic valve closing can be simplified as much as possible. is there.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an example device.

FIG. 2 is a waveform diagram of the apparatus of the embodiment.

FIG. 3 is a flowchart showing the operation of the apparatus of the embodiment.

FIG. 4 is a flowchart showing the operation of the apparatus of the embodiment.

[Explanation of symbols]

 1 Commercial AC Power Supply 3 DC Power Supply Circuit 12 Microcomputer 13 Human Body Sensor 14 Driver 15 Solenoid Valve

Claims (1)

[Claims] 1. A DC power supply circuit for rectifying and smoothing the output of a commercial AC power supply, and a DC power supply circuit that is energized by the DC power supply circuit to perform a valve opening operation and a valve closing operation. In an automatic water supply control device including a valve device having a latch function and a control device that performs a water supply operation by controlling an opening / closing operation of the valve device based on an external signal, an output cycle of the commercial AC power supply A signal generating means for outputting a pulse signal having a proportional relationship, and counting the output of the pulse signal only for a fixed measurement time at every predetermined time, and a power failure detection signal when the number of pulses during this time falls below a reference number And a power failure detection means for outputting the power failure, wherein the control device is configured to perform a valve closing operation of the valve device based on the power failure detection signal. .