JPH01206178A - Control circuit for water supply control device - Google Patents

Abstract

PURPOSE:To prevent useless water from being discharged, by saturating a capacitor with the output voltage of a rectifier, and by using energy accumulated in the capacitor so as to close a solenoid valve when the output of the rectifier is stopped due to power failure. CONSTITUTION:An input terminal 5-1 of a regulator 5 in a power source A and a ground G are connected together through a large capacitor C, and a voltage drop detection element D is disposed between an output terminal 4a of a rectifier 4 and the ground G. With this arrangement, the capacity C may be saturated with the output voltage of the rectifier 4, and when the output of the rectifier 4 is stopped due to power failure, the voltage drop detecting element D detects a voltage drop, and accordingly, charge energy in the capacitor C is used to energize a closing solenoid 14c in a solenoid valve which is therefore closed to automatically stop the supply of water, thereby it is possible to prevent water from being uselessly discharged.

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention provides a water supply control device that detects whether or not a water washer, etc. is being used and automatically stops the water supply to the water washer, etc. Regarding control circuits.

(b) Conventional technology Conventionally, among the water supply control devices for water washers, Japanese Patent Application Laid-Open No. 62-1
As seen in Japanese Patent Application No. 56446, there was a water supply solenoid valve whose valve mechanism was provided with a latching function so that the solenoid valve could be driven with a pulsed current, thereby saving power.

(c) Problems that the invention seeks to solveHowever,
The above-mentioned solenoid valve has a drawback that if a power outage occurs while the solenoid valve is in use, that is, when the solenoid valve is open, the solenoid valve remains open and water continues to flow.

(d) Means for Solving the Problems The present invention provides a water supply control device in which a solenoid valve equipped with a valve mechanism having a latching function is opened and closed using a pulsed current. , a transformer, a rectifier, and a step-down regulator to supply constant voltage power to the water supply control unit, and connect the input terminal of the regulator to the ground via a capacitor, and connect the output terminal of the rectifier to the ground. A voltage drop detection element is interposed between the capacitor and the detection output of the element to be input to the control device, and when the element detects a voltage drop, the electric charge charged in the capacitor causes the electromagnetic It is an object of the present invention to provide a control circuit for a water supply control device characterized in that a valve is caused to perform a closing operation.

(e) Effect In this invention, the output voltage of the rectifier is stepped down to the power supply voltage of the control device using a step-down regulator, so when the power is applied from the power supply, the capacitor has a voltage higher than the power supply voltage of the control device. is saturated at the rectifier output voltage.

When a power outage occurs, the rectifier output voltage drops, but this voltage drop is detected by a voltage drop detection element and input to the control device, which closes the solenoid valve as described below.

As mentioned above, the electromagnetic valve operates with pulsed current, so its power consumption is extremely low, and the electric charge accumulated in the capacitor, more specifically, the energy of the electric charge shown by the hatched part in Fig. 6, is used to operate the electromagnetic valve. It can be driven sufficiently.

In addition, since a step-down regulator is used to step down the rectifier output voltage to the power supply voltage of the control device, the range in which the capacitor charge can be used is up to the lower limit of the regulator's operable voltage, and within this range, the regulator cannot control the voltage. A regular power supply voltage is output to the device, and the control device and the solenoid valve can be operated for a sufficient time to close the solenoid valve, and once the solenoid valve closes, it is latched by the valve mechanism and the quantity valve is closed. The closed state is maintained.

(F) Effect According to this invention, a capacitor is saturated with the output voltage of a rectifier, and when the rectifier output stops due to a power outage, a voltage drop is detected by a voltage drop detection element, and the charge accumulated in the capacitor is By using this energy to close the electromagnetic valve, even if a power outage occurs during use, the water supply can be automatically stopped and the wasteful release of water can be stopped.

(G) Embodiment The embodiment of the present invention will be explained in detail based on the drawings. FIG.
indicates a control device, and the power supply section (A) is 100V,
The AC power supply (1) of 50 to 60 tlz is stepped down to about 20V using a transformer (2), converted to DC using a rectifier (4), and then reduced to about 6V using a step-down regulator (5). ).

The regulator (5) converts the DC voltage of about 20V from the rectifier (4) into a control device (as shown in FIGS. 2 and 3).
It steps down the power supply voltage to approximately 6V, which is required for B), and stably supplies it to the control device (B).
The three-terminal step-down regulator shown in the equivalent circuit diagram in the figure (
5b) may be used, but if noise countermeasures are perfect, it is preferable to use the regulator (5b) shown in FIG. 3, which has less power loss.

In Figures 2 and 3, (6) is a Zener diode, and (7) is an F for keeping the Zener current approximately constant.
ET, (8) is a diode for temperature compensation, (9) is an operational amplifier for controlling the transistor (10), and the second
In the regulator (5a) shown in the figure, as a differential amplifier circuit,
The regulator (5b) in FIG. 3 is used as a Schmitt circuit.

The transistor (10) is also used as a current amplifying element in the regulator (5a) of FIG. 2, and as a switching element in the regulator (5b) of FIG. 3.

(R1) and (R2) are for obtaining a comparison voltage by dividing the output voltage of the regulator (5).

In addition, in FIG. 3, (11) is the actance for accumulating the energy of the current, and (12) is the diode for continuing to flow current to the output side even when the output from the transistor (10) is OFF. Use a fast recovery diode such as a Schottky type.

The control device (B) has a calculation processing unit (B1) connected to a sensor (S), such as an infrared sensor, which detects whether the water washer is in use, that is, whether there is a human body below the faucet. When a human body detection signal is input from (S), a pulse-like opening/closing signal corresponding to the signal is output from the same processing section (B1) to the solenoid driver (3) to control the opening/closing of the solenoid valve (14). I have to.

As shown in Fig. 4, the solenoid valve (14) has opening/closing coils (14b) (14c) of a solenoid (14a) arranged in the upper part, and a valve mechanism (15) arranged in the lower part. (
When the plunger (14b) is energized, it pulls up the plunger (15a), and when the closing coil (14C) is energized, the plunger (15a) is pushed down.

The valve mechanism (15) is composed of a valve seat (15b), a valve body (15c), and a diaphragm (15d), and in the center of the valve body (15C) is a pilot valve that is opened and closed by a plunger (15a). (15e), and the diaphragm (15d) is provided with an orifice (15e) having a resistance greater than the flow resistance when the pilot valve (15e) is opened.
f) is perforated.

Therefore, when the open coil (tab) is energized, the pilot valve (15e) opens and the pressure on the top surface of the diaphragm (15d) decreases, so the water pressure from the inlet (15g) pushes the valve body (15c) upward and electromagnetic Open the valve (14) and maintain this state.

Furthermore, when the closing coil (14c) is energized, the pilot valve (15e) closes and the water flowing in from the orifice (15f) increases the pressure on the top surface of the diaphragm (15d).
Push down the valve body (15c) to close the solenoid valve (14),
Maintain this state.

As described above, the opening/closing coils (14b) (14c) are connected to the plunger (15a) for opening/closing the pilot valve (15e).
), the same coil (14b) (
14c) is required to be extremely small, and since the open/closed state of the solenoid valve (14) is latched by water pressure, power consumption can be reduced.

In such a control device, in the present invention, as shown in FIG. 1, the input terminal (
5-1) and the ground (G) are connected via a capacitor (C) with a large capacity exceeding the capacitance range of the ripple removal smoothing capacitor commonly used, and the rectifier (4) In addition to saturating the capacitor (C) with the output voltage of Then, the same element (D) monitors the rectifier output voltage, and when the output voltage of the rectifier (4) decreases below the set value due to a power outage, etc., it outputs a voltage drop signal and controls the output voltage of the rectifier (B). Solenoid driver (3)
), the closing coil (14c) of the solenoid valve (14) is operated to close the open valve (14).

As shown in the equivalent circuit diagram in Fig. 5, the voltage drop detection element (D) has a built-in 1°2V reference voltage circuit (Ref), and the rectifier (4) is connected to the input terminal (Dl). The output voltage is divided by resistors (R3) (R4) and applied, compared with the above reference voltage by a comparator (D2), and the input terminal (D
When the output voltage of the rectifier (4) applied to the rectifier (4) becomes lower, a detected force is transmitted from the output terminal (D3) to the control device (B).

(04) is a power supply terminal connected to the output side of the regulator (5), (D5) is a constant current circuit, (D6) is a hysteresis setting terminal, and the external terminal is an input terminal (Dl) via a resistor (R5). Positive feedback is provided to prevent the above output from occurring due to voltage fluctuations of the ripple level.

In addition, the solenoid driver (3) has a solenoid valve (14).
AND gate (18) connected to the open coil (14b) of
, a closed coil (14C) and an unconnected OR gate (19) are arranged, and the open coil output from the control device (B) is input to the AND gate (18), and a voltage drop detection element (
The detection output of D) is inverted and input, and the closed coil output of the control device (B) and the output of the same element (D) are input to the OR gate (19).

The embodiment of the present invention is configured as described above, and when the sensor (S) detects that the water washer is being used when power is being supplied from the AC power source (1), the controller (B) sends a solenoid driver. (3), a pulse-like control output is made to the opening coil (14b) of the solenoid valve (14) to open the valve (14) and maintain this state. When the sensor (S) detects non-use, the control device (B) outputs a pulse-like control output to the closing coil (14C) to close the open valve (14) and maintain this state.

Next, control operations during a power outage will be explained.

When the power supply from the alternating voltage (1) is cut off, the rectifier (
The output voltage of 4) decreases, but the capacitor (C) has already accumulated a charge with approximately the same potential as the rectifier output voltage, and the charge energy of this capacitor (C) is used to control the solenoid valve (14). Open valve (14c) to closed coil (14c)
) to generate a control output regardless of the open/closed state of the valve (14).
The closing operation is made to perform the closing operation.

That is, a drop in the output voltage of the rectifier (4) is sensed by the voltage drop detection element (D), and the detected output of the element (0) is
By inputting an inverse input to the AND gate (18) of the solenoid driver (3) and at the same time inputting an input to the OR gate (19), if the solenoid valve (14) is in a closed state, this state is maintained, and if it is in an open state, it is closed. Activate and maintain the closed state,
If the valve is in the process of opening, the valve can be stopped and the valve can be closed to maintain the closed state.

As mentioned above, in the control circuit of the water supply control device of this embodiment, regardless of whether the solenoid valve (14) is open or closed, the valve is open or closed (
14), if a power outage occurs, the solenoid valve (14) will automatically close and remain closed, so even if a power outage occurs while the water washer is in use, the solenoid valve (14) will close immediately. This has the effect of being able to stop water from flowing out and preventing water from being left running.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of a control circuit in a water supply control device according to the present invention. 2 and 3 are equivalent circuit diagrams of the regulator. FIG. 4 is a longitudinal sectional view of the solenoid valve. FIG. 5 is an equivalent circuit diagram of a voltage drop detection element. FIG. 6 is a graph showing the relationship between capacitor voltage and time. (8): Power supply section (B) Second control device (C): Capacitor (D): @ Pressure drop detection element (G) Nigeround (2) Nidorance (4): Rectifier
(5): Regulator (14): Solenoid valve

Claims (1)

[Claims] 1) Solenoid valve equipped with a valve mechanism with latching function (
14) is configured to open and close using a pulsed current, and the power supply section (A) of the control device is composed of a transformer (2), a rectifier (4), and a step-down regulator (5). and supply a constant voltage power supply to the water supply control unit (B)
and the input terminal (5-1) of the regulator (5).
) and the ground (G) via a capacitor (C), and a voltage drop detection element (D) is interposed between the output terminal (4a) of the rectifier (4) and the ground (G). , the detection output of the element (D) is configured to be input to the control device (B), and when the element (D) detects a voltage drop, the electric charge charged in the capacitor (C) causes the electromagnetic A control circuit for a water supply control device, characterized in that a valve (14) is caused to perform a closing operation.