JP2596577B2 - Automatic water supply stop device in case of power failure in water supply control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial application field The present invention relates to a water supply control device which detects whether or not a water washer is used and automatically controls water supply to the water washer. The present invention relates to an automatic water supply stop device at the time of a power outage.

(B) Conventional technology Conventionally, among water supply control devices for a flusher, Japanese Patent Application Laid-Open No. 62-15 / 1987
As disclosed in Japanese Patent Publication No. 6446, there has been a device in which the valve mechanism of a water supply electromagnetic valve is provided with a latching function so that the electromagnetic valve can be driven by a pulsed current to save power.

(C) Problems to be Solved by the Invention However, in the above-described solenoid valve, if a power failure occurs during use, that is, when the solenoid valve is open, the solenoid valve remains open and water is allowed to flow away. There was a disadvantage that there is.

(D) Means for Solving the Problems According to the present invention, in a water supply control device in which a solenoid valve provided with a valve mechanism having a latching function is opened and closed by a pulse current, a power supply unit of the control device is provided. , A transformer, a rectifier, and a step-down regulator to supply a constant voltage power to the water absorption controller, connect the input terminal of the regulator and 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 control valve and the water supply control unit, and when the element detects a voltage drop, the solenoid valve performs a closing operation. The present invention provides an automatic water supply stop device at the time of a power failure in a water supply control device having the above-described configuration.

(E) Function In the present invention, the output voltage of the rectifier is reduced by the step-down regulator to the power supply voltage of the water supply control unit.
When power is supplied from the power supply, the capacitor is saturated with a rectifier output voltage higher than the control unit power supply voltage.

When a power failure occurs, the output voltage of the rectifier drops. This drop in voltage is detected by a voltage drop detection element and input to the water supply control unit, which closes the solenoid valve as described below.

Since the solenoid valve operates with a pulsed current as described above, the power consumption is extremely small, and the electric charge stored in the capacitor, specifically, the energy of the electric charge indicated by the hatched portion in FIG. It can be driven sufficiently.

Also, since the rectifier output voltage is reduced to the power supply voltage of the water supply control unit with a step-down regulator, the lower limit of the operable voltage of the regulator is the range where the capacitor charge can be used. A normal power supply voltage is output to the water supply control unit, and the water supply control unit can be operated only for a time sufficient for closing the electromagnetic valve.

(F) Effect According to the present invention, the capacitor is saturated with the output voltage of the rectifier, and when the output of the rectifier stops due to a power failure,
By detecting the voltage drop with the voltage drop detection element and closing the solenoid valve with the energy of the electric charge accumulated in the capacitor, even if a power failure occurs during use, the water supply is automatically stopped. Release of wasteful water can be stopped.

(G) Embodiments Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention.
(B) shows the water supply control unit, and the power supply unit (A)
0V, 50-60Hz AC power supply (1) with transformer (2) about 20V
The voltage is lowered to about 6 V by a rectifier (4) and supplied to a water supply control section (B) by a step-down regulator (5).

The regulator (5) reduces the DC voltage of about 20V from the rectifier (4) to about 6V of the power supply voltage required for the control device (B) as shown in FIGS. (B), a step-down three-terminal regulator (5a) shown in the equivalent circuit diagram of FIG. 2 or a step-down three-terminal regulator (5b) shown in the equivalent circuit diagram of FIG.
However, it is preferable to use the regulator (5b) of FIG. 3 which has a small power loss if noise suppression is thorough.

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

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

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

In FIG. 3, (11) is a reactance for accumulating current energy, and (12) is a diode for keeping current flowing to the output side even when the output from the transistor (10) is OFF. A fast recovery diode such as a Schottky type is used.

In FIG. 1, (13) indicates a smoothing capacitor for removing ripples, and (16) indicates a diode connected in the forward direction.

The water supply control section (B) is connected to the arithmetic processing section (B1) with a sensor (S) for detecting the presence or absence of a flusher, that is, the presence or absence of a human body below the faucet, such as an infrared sensor. When a human body detection signal from the sensor (S) is input, a pulse-like opening / closing signal corresponding to the above signal is output from the processing section (B1) to the solenoid driver (3), and opening / closing control of the solenoid valve (14) is performed. Like that.

As shown in FIG. 4, the solenoid valve (14) has an open / close coil (14b) (14c) of a solenoid (14a) at the upper part and a valve mechanism (15) at the lower part, and has an open coil. When power is supplied to (14b), the plunger (15a) is pulled up, and when power is supplied to the closed coil (14c), the plunger (15a) is pushed down.

The valve mechanism (15) is composed of a valve seat (15b), a valve element (15c) and a diaphragm (15d), and a pilot valve opened and closed by a plunger (15a) is provided at the center of the valve element (15c). (15e), and the diaphragm (15d)
An orifice (15f) having a resistance greater than the flow resistance when the pilot valve (15e) is opened is formed.

Therefore, when power is supplied to the open coil (14b), the pilot valve (15e) opens, and the pressure on the upper surface of the diaphragm (15d) decreases.
The solenoid valve (14) is opened upward, and this state is maintained.

When the closed coil (14c) is energized, the pilot valve (15e) closes, and the water flowing from the orifice (15f) increases the pressure on the upper surface of the tire flam (15d), and the valve body (15c)
c) Press down to close the solenoid valve (14) and maintain this state.

As described above, since the open / close coils (14b) and (14c) only operate the plunger (15a) for opening and closing the pilot valve (15e), the current for driving the coils (14b) (14c) is extremely large. The power consumption is small because the open / closed state of the solenoid valve (14) is latched by water pressure.

In such a water supply control device, in the present invention, as shown in FIG. 1, a generally used ripple is provided between an input terminal (5-1) of a regulator (5) of a power supply section (A) and a ground (G). The capacitor is connected via a large-capacity capacitor (C) beyond the capacity range of the smoothing capacitor for removal, so that the capacitor (C) is saturated with the output voltage of the rectifier (4) and the rectifier (4) Output terminal (4a)
A voltage drop detecting element (D) such as M5247 (Mitsubishi) is interposed between the rectifier and the ground, and the rectifier output voltage is monitored by the element (D). When the voltage drops below the set value, a voltage drop signal is output,
A closing coil (14c) of the solenoid valve (14) is operated via a solenoid driver (3) provided in the water supply control section (B) to close the valve (14).

The voltage drop detecting element (D) has a built-in 1.2 V reference voltage circuit (Ref) as shown in the equivalent circuit diagram of FIG. 5, and the output of the rectifier (4) is provided at the input terminal (D1). The voltage is applied by dividing the voltage with resistors (R3) and (R4), and the comparator (D
In step 2), when the output voltage of the rectifier (4) applied to the input terminal (D1) is lower than the reference voltage, the detection output is output from the output terminal (D3) to the water supply control unit (B). Outgoing.

(D4) 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 an input terminal (D1) via an external resistor (R5).
The above-mentioned output is not performed with a voltage fluctuation of about a ripple by performing positive feedback.

The solenoid driver (3) has a solenoid valve (14)
An AND gate (18) connected to the open coil (14b) and an OR gate (19) connected to the closed coil (14c) are provided, and the open coil output from the water supply control unit (B) is provided to the AND gate (18). And the detection output of the voltage drop detection element (D) is inverted and the closed gate output of the control section (B) and the output of the element (D) are input to the OR gate (19). .

The embodiment of the present invention is configured as described above, and when the power is supplied from the AC power supply (1), when the sensor (S) detects the use of the washing machine, the water supply control unit (B).
From solenoid valve (14) via solenoid driver (3)
A pulse-like control output is applied to the open coil (14b) to open the valve (14) and maintain this state. When the sensor (S) detects the non-use, the control section (B) outputs a pulse-like control output to the closed coil (14c) and the valve (1).
4) Close and maintain this state.

 Next, a control operation at the time of a power failure will be described.

When the power supply from the AC voltage (1) is cut off, the output voltage of the rectifier (4) is pulled down by the resistors (R3) and (R4) and drops rapidly, but the capacitor (C) is turned on by the forward diode (16). ), The control energy is generated by using the charge energy of the capacitor (C) to the closed coil (14c) of the solenoid valve (14) regardless of the open / closed state of the valve (14). The valve (14) is made to perform a closing operation.

That is, a decrease in the output voltage of the rectifier (4) is sensed by the voltage drop detection element (D), and the detection output of the element (D) is detected by the AND gate (18) of the solenoid driver (3).
When the solenoid valve (14) is in the closed state, this state is maintained if the solenoid valve (14) is in the closed state. If the valve is being opened, the operation can be stopped to perform the valve closing operation, and the valve closing state can be maintained.

As described above, in the automatic water supply stop device at the time of power failure according to the present embodiment, regardless of the open / close state of the solenoid valve (14), and even during the opening / closing operation of the valve (14), the automatic water supply stop device is automatically activated. Since the solenoid valve (14) closes and the closed state is maintained,
Even if a power failure occurs during the use of the water washer, the outflow of water can be stopped immediately, so that there is an effect that the water is prevented from flowing away.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of an automatic water supply stop device at the time of a power failure 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 a solenoid valve. FIG. 5 is an equivalent circuit diagram of the voltage drop detecting element. FIG. 6 is a graph showing the relationship between capacitor voltage and time. (A): Power supply unit, (B): Water supply control unit (C): Condenser, (D): Voltage drop detection element (G): Ground, (2): Transformer (4): Rectifier, (5): Regulator (14): Solenoid valve

Continuation of front page (56) References JP-A-51-103316 (JP, A) JP-B-40-13467 (JP, B1)

Claims (1)

(57) [Claims] 1. A water supply control device in which a solenoid valve (14) having a valve mechanism having a latching function is opened and closed by a pulse current, wherein a power supply section (A) of the control device is provided.
Is composed of a transformer (2), a rectifier (4), and a step-down regulator (5) to supply power of a constant voltage to the water supply control unit (B), and the input terminal (5- 1) and a ground (G) are connected via a capacitor, and a voltage drop detecting element (D) is provided 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 water supply control section (B), and when the element (D) detects a voltage drop, the solenoid valve (14) performs a closing operation. Automatic water supply stop device at the time of a power failure in the water supply control device.