JPH0743188A - Electronic circuit for water purifier - Google Patents

Abstract

PURPOSE:To minimize the fluctuation in output signal value of a water detecting part even when the voltage or current of a supplied power is unstable by supplying the power having a fixed voltage or a fixed current from a prescribed power source to a part or all of the water detecting part through a constant voltage circuit means or constant current circuit means. CONSTITUTION:A constant voltage circuit 16 stabilizes the output voltage of a main power source part 10 by a Zener diode D10 and a diode D12, and supplies a power having a fixed voltage to the LED 22 and photo transistor 10Q of a water detecting part 12 and the threshold forming circuit 13A of a comparing part. The circuit 13A of the comparing part divides the voltage inputted through a constant voltage circuit by resistors R22 and R20 to form a threshold for identifying water passing and nonwater passing states. The threshold is outputted to a circuit 13B, and the circuit 13B compares the voltage value between the emitter and collector of the transistor with the threshold by an operational amplifier 18, and conducts signal processing and display. When the voltage value is the threshold or more, the operational amplifier 18 outputs a voltage L to a NAND gate circuit 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic circuit of a water purifier having a function of measuring, displaying and storing an accumulated used flow rate and an accumulated used time.

[0002]

2. Description of the Related Art A water purifier having a function of measuring, displaying, and storing an accumulated used flow rate and an accumulated used time is provided with a water detecting section and a comparing section for judging whether water is flowing or not in an electronic circuit. Some have. The output signal value of the water detection unit is compared with a threshold value for identifying the water passing state or the water non-passing state in the comparing unit, and a signal corresponding to the water passing state or the water non-passing state is output. Based on this signal, the integrated processing flow rate and the integrated usage time are measured on the signal processing display unit in the electronic circuit of the water purifier.

[0003]

In the electronic circuit of the water purifier described above, if the voltage or current of the electric power supplied to the water detection unit and the comparison unit is unstable, the output signal value of the water detection unit and the comparison unit The threshold changes. At this time, the magnitude of the output signal value of the water detection unit and the magnitude of the threshold value of the comparison unit are reversed, and it is determined that water is not flowing even if water is flowing, or vice versa. It may happen. In particular, the fluctuation of the output signal value of the water detection unit that occurs when the voltage or current of the supplied power fluctuates is greater than the fluctuation of the threshold value of the comparison unit, and the fluctuation of the output signal value of this water detection unit is large. Therefore, the magnitude relationship between the output signal value and the threshold value is often reversed.

For example, there is one used as a water detector in which an LED of a light emitting element and a phototransistor of a light receiving element are arranged so as to sandwich a water channel. In this water detection unit, since the refractive indices of air and water are different, the amount of light incident on the light receiving surface of the phototransistor from the LED varies depending on whether water is passed or not.
The voltage between the collector and the current flowing between the emitter and the collector change. An output signal of the water detector is obtained by the current or voltage that changes depending on whether water is passed or not. In the electronic circuit of the water purifier having this water detection unit, the waveform of the voltage of the electric power supplied to the water detection unit includes ripples generated during the rectification of the AC power supply and pulse noise due to the pulse signal such as the master clock of the signal processing unit. If the voltage is unstable due to this, the amount of light emitted from the LED of the water detector may not be stable. For this reason, the amount of light received by the phototransistor may fluctuate and the output signal value of the water detector may fluctuate, and the comparison unit may erroneously determine whether the water is flowing or not.

In addition to the above, there is a pressure sensor in which one of four semiconductor strain gauges forming a bridge circuit is attached to a diaphragm for use in a water detecting section. In the water detection unit using this pressure sensor, the diaphragm of the pressure sensor is arranged in the water passage so that water pressure is applied to the diaphragm. When water pressure is applied to the diaphragm, the strain gauge deforms together with the diaphragm, and the resistance value of the strain gauge changes greatly due to the piezoresistive effect. The change in the resistance value of the strain gauge is detected by the bridge circuit, and the output signal of the water detector is obtained.

[0006] In some pressure sensors, even if the voltage of the supplied power is stable, if the current of the supplied power is unstable, the output signal value of the pressure sensor fluctuates due to the temperature characteristics of the pressure sensor. In the electronic circuit of a water purifier that has such a pressure sensor in the water detection unit, if the current of the power supplied to the water detection unit is unstable, the output signal value of the water detection unit fluctuates and the water flow state in the comparison unit. There is a case that the non-water flow state is erroneously determined.

Further, the LED of the light emitting element and the phototransistor of the light receiving element are provided so as to sandwich the water channel, and the electronic circuit of the water purifier having the above-mentioned water detecting section utilizing the fact that the refractive indexes of air and water are different is used. In some cases, a power source such as a battery whose output voltage decreases with consumption is used. in this case,
If the output voltage of the power supply is high, the voltage of the power supplied to the water detection unit may fluctuate due to surrounding pulse signals such as the master clock of the signal processing unit, and the amount of light emitted from the LED may become unstable, as described above. . Conversely, if the output voltage of the power supply is low, the influence of the surrounding pulse signal will be less, but the LED
The variation in the current supplied to the LED may be relatively significant, and the amount of light emitted from the LED may be unstable. Therefore, regardless of whether the output voltage of the power supply is high or low, the amount of light received by the phototransistor also fluctuates and the output signal value of the water detector also fluctuates. is there.

As described above, when the voltage or current of the electric power supplied to the water detection unit of the electronic circuit of the water purifier is unstable, the comparison unit may erroneously determine whether the water is flowing or not. . Therefore, the present invention minimizes the fluctuation of at least the output signal value of the water detection unit even if the voltage or current of the power supplied to the water detection unit and the comparison unit of the electronic circuit of the water purifier is unstable, It is an object of the present invention to provide an electronic circuit of a water purifier in which a water passing state and a water non-passing state are accurately judged by a comparison unit.

[0009]

In order to achieve the above object, the present invention uses a constant voltage circuit means or a constant current circuit means to supply a constant voltage power to a part or all of a water detection unit from a predetermined power source. Power of constant current is supplied.
That is, according to the present invention, a water detection unit, a comparison unit that compares the value of the output signal of the water detection unit and a threshold value for identifying the water flow state and the water non-water flow state of the water purifier, A signal processing and display unit that measures, displays, and stores an integrated usage flow rate or an integrated usage time based on the output signal of the comparison unit, and supplies a constant voltage of electric power from a predetermined power source to a part or all of the water detection unit. There is provided an electronic circuit of a water purifier having one or both of a constant voltage circuit means for supplying a constant current and a constant current circuit means for supplying a constant current power to a part or all of the water detector.

When a power source such as a battery whose output voltage decreases with power consumption is used as the power source of the electronic circuit of the water purifier, when the output voltage of the power source is high, the water detecting unit of the water detecting unit is operated through the constant voltage circuit means. A part or all of the power is supplied with a constant voltage. When the output voltage of the power supply is low, a constant current power is supplied to a part or all of the water detection unit via the constant current circuit means. By using the constant voltage circuit means when the output voltage of the power supply is high, it is possible to supply electric power with the voltage fluctuated due to the influence of the surrounding pulse signal being a constant voltage. When the output voltage of the power supply is low, by using the constant current circuit means, it is possible to supply the electric power while minimizing the variation of the current, which becomes noticeable due to the low output voltage of the power supply. Further, for the same reason, in order to prevent the threshold value created by the threshold value creating means from changing, the constant voltage circuit means is used when the output voltage of the power source is high, and the constant current circuit means is used when the output voltage of the power source is low. The electric power is supplied via the threshold value generating means of the comparison unit.

That is, according to the present invention, a water detector,
Comparing the threshold value creating means for creating a threshold value for distinguishing the water passing state and the water non-passing state of the water purifier, and further comparing the value of the output signal of the water detecting section with the threshold value. A comparing unit having a means, a signal processing display unit for measuring, displaying and storing an integrated used flow rate or an integrated used time based on an output signal of the comparing unit; and a part or all of the water detection unit from a predetermined power source. First constant voltage circuit means for supplying a constant voltage power, second constant voltage circuit means for generating a constant voltage power from the predetermined power source, and constant current power from the predetermined power source Constant current circuit means for generating the constant current, second constant current circuit means for generating a constant current power from the predetermined power source, and the first constant voltage circuit means according to the output voltage of the predetermined power source. Alternatively, either one of the first constant current circuit means First switching means for switching and supplying electric power from the predetermined power source to the predetermined part of the part of the water detecting section; and the second constant voltage circuit means or the second constant voltage circuit means according to the output voltage of the predetermined power source. There is provided an electronic circuit of a water purifier having a second switching means for switching to either one of the second constant current circuit means and supplying electric power from the predetermined power source to the threshold value generating means.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a first electronic circuit of the water purifier of the present invention.
It is a block diagram which shows the structure of an Example, and FIG. 2 is an electronic circuit diagram which shows the water detection part 12, the comparison part 13, and the constant voltage circuit 16 of the electronic circuit of this water purifier.

The main power source section 10 includes a water detecting section 12 and a comparing section 1.
3 and the signal processing display unit 14 are supplied with electric power. However, power is supplied to the LED 22 of the water detection unit 12, the phototransistor Q10, and the threshold value generation circuit 13A of the comparison unit 13 via the constant voltage circuit 16. The constant voltage circuit 16 also serves as the two constant voltage circuits of claim 2. Water detector 12
Has an LED 22 and a phototransistor Q10 which are arranged so as to sandwich the water channel, and detects water by utilizing the fact that the refractive indices of air and water are different. The comparison unit 13 has a threshold value generation circuit 13A and a comparison circuit 13B, and identifies the output signal value of the water detection unit 12 and the water passing or non-water passing state of the water purifier created by the threshold value generating circuit 13A. Threshold comparison circuit 1
3B, and the voltage corresponding to the magnitude is output to the signal processing display unit 14 as a signal. The signal processing display unit 14 calculates the cumulative flow rate based on the signal output from the comparison unit 13,
Measure and store the total usage time.

Next, the operation of the electronic circuit of this water purifier will be described with reference to the electronic circuit diagram of FIG. The constant voltage circuit 16 stabilizes the output voltage of the main power supply unit 10 by using the Zener diode D10 and the diode D12 arranged in the forward direction, and the LED 22 of the water detection unit 12 and the phototransistor Q10.
Also, a constant voltage power is supplied to the threshold value generation circuit 13A of the comparison unit 13.

The LED 22 of the water detector 12 and the phototransistor Q10 are arranged so as to sandwich the water channel. When water flows and water is present in the water channel, the light emitted from the LED 22 toward the phototransistor Q10 does not enter the light receiving surface of the phototransistor Q10 because the refractive indices of the air and the water are different. The voltage across the collector is high. On the contrary, when the flow of water stops and there is no water, the light emitted from the LED 22 goes straight and enters the light receiving surface of the phototransistor Q10, so that the voltage between the emitter and collector of the phototransistor Q10 becomes low. Thus, the voltage between the emitter and collector of the phototransistor Q10 changes depending on whether or not water exists in the water channel. This voltage is output to the comparison circuit 13B of the comparison unit 13 as an output signal of the water detection unit 12.

The threshold value generation circuit 13A of the comparison unit 13 divides the voltage input through the constant voltage circuit 16 by the resistors R22 and R20 to discriminate between the water passing state and the water non-passing state. Create a value. This threshold value is output to the comparison circuit 13B. The comparator circuit 13B is an operational amplifier 18
Then, the voltage value between the emitter and collector of the phototransistor Q10 is compared with the threshold value, and the result is output to the signal processing display unit 14. When the voltage value between the emitter and collector of the phototransistor Q10 is equal to or higher than the threshold value, it is determined that the water purifier is in the water-passing state, and the operational amplifier 18 is NAN.
It outputs a "low" voltage to the D gate circuit 20. Therefore, the voltage output from the NAND gate circuit 28 to the signal processing display section 14 becomes "high".

On the contrary, when the voltage value between the emitter and collector of the phototransistor Q10 is smaller than the threshold value, it is judged that the water purifier is in the non-flowing state, and the operational amplifier 18 is NA.
Outputs a "high" voltage to the ND gate circuit 20,
The voltage applied to the signal processing display section 14 of the D gate circuit 20 becomes "low". In this way, the voltage according to the water flow state and the water non-water flow state is output to the signal processing display unit 14. In the first embodiment, the LED of the water detection unit 12 is controlled by the constant voltage circuit 16.
22 and the phototransistor Q10 and the threshold value generation circuit 13A of the comparison unit 13 are supplied with a constant voltage, so that the fluctuation of the output signal value of the water detection unit 12 and the threshold value of the comparison unit 13 should be minimized. You can

Next, a second embodiment of the electronic circuit of the water purifier of the present invention will be described. 3 is a block diagram showing a configuration of an electronic circuit of the water purifier, and FIG. 4 is a water detection unit 32, a comparison unit 33, a constant voltage circuit 35, a constant current circuit 36, a pulse generation circuit unit of the electronic circuit of the water purifier. FIG. 37 is an electronic circuit diagram of 37.

The main power source section 30 includes a water detecting section 32 and a comparing section 33.
And power is supplied to the signal processing display unit 34. However, electric power is supplied to the differential amplifier 48 of the water detection unit 32 and the threshold value generation circuit 33A of the comparison unit 33 via the constant voltage circuit 35, and the pressure sensor 49 of the water detection unit 32 is supplied with the constant current circuit 36.
Power is supplied via. Since the constant current circuit 36 is driven intermittently by the pulse generation circuit 37, the water detection unit 32 is also driven intermittently. The water detector 32 detects the pressure of the water flowing through the water channel with the pressure sensor 49. The comparison unit 33 has a threshold value generation circuit 33A and a comparison circuit 33B, and compares the value of the output signal of the water detection unit with the threshold value generated by the threshold value generation circuit by the comparison circuit 33B. The output voltage is output as a signal to the signal processing display unit 34. The signal processing / display unit 34 measures, displays, and stores the integrated usage flow rate and the integrated usage time based on the signal output from the comparison unit 33.

Next, the operation of the electronic circuit of this water purifier will be described with reference to the electronic circuit diagram of FIG. The pressure sensor 49 used in the water detection unit 32 is one in which the strain gauge pr1 of the four strain gauges pr1, pr2, pr3, pr4 forming a bridge circuit is attached to the diaphragm. This diaphragm is placed in the water channel of the water purifier and is designed to receive water pressure. When water pressure is applied to the diaphragm, the strain gauge pr1 is deformed, and the resistance value of the strain gauge greatly changes due to the piezoresistive effect.
Therefore, the two terminals T1 provided in the bridge circuit,
The voltage across T2 changes with the water pressure applied to the diaphragm. This voltage is amplified by the differential amplifier 48, and the water detector 3
The second output signal is output to the comparison circuit 33B of the comparison unit 33. Similar to the case of the first embodiment, the comparison unit 33 compares the signal value output from the water detection unit 32 with the operational amplifier 40 of the comparison circuit 33B and the threshold value created by the threshold value creation circuit 33A, and compares the values. Is output to the signal processing display unit 34.

The pulse generating circuit section 37 has a duty ratio of 0.2% according to the ratio of the resistance values of the resistor R50 and the resistor R52, and has an ON time of 0.
A pulse of 002 seconds is continuously oscillated toward the constant current circuit 36. When the transistor Q30 of the constant current circuit 36 is turned on by this pulse, a constant current power is supplied from the main power source unit 10 to the pressure sensor 49 of the water detecting unit 32 via the FET Q32. Power is not supplied to the pressure sensor 49 when the transistor Q30 is off. Further, the threshold value generation circuit 33A of the comparison unit 33 is supplied with a constant voltage power by the zener diode D34 of the constant voltage circuit 35 and the diode 36 arranged in the forward direction. In the second embodiment, the constant current circuit 36 supplies a constant current power to the pressure sensor 49 of the water detector 32, and the constant voltage circuit 35 supplies the thresholds of the differential amplifier 48 of the water detector 32 and the comparator 33. Since a constant current of electric power is supplied to the value creating circuit 33A, fluctuations in the output signal value of the water detecting unit 32 and the threshold value of the comparing unit 33 can be minimized.

Next, a third embodiment of the electronic circuit of the water purifier of the present invention will be described. FIG. 5 is a block diagram showing a configuration of an electronic circuit of the water purifier, and FIG. 6 is a water detecting unit 52, a comparing unit 53, a constant voltage circuit 55, a first constant current circuit 56A, a second electronic circuit of the water purifier. Constant current circuit 56B, first switching circuit 5
8A is an electric circuit diagram of a second switching circuit 58B. FIG.

A battery whose output voltage decreases with power consumption is used for the main power supply unit 50, and power is supplied to the water detection unit 52, the comparison unit 53, and the signal processing display unit 54. However, the LED 76 of the water detector 52 has a constant voltage circuit 55 or a first voltage
One of the constant current circuits 56A is selected by the first switching circuit, and power is supplied from the main power supply unit 50 via this selected circuit. Threshold value creation circuit 5 of comparison unit 53
One of the constant voltage circuit 55 and the second constant current circuit 56B is selected by the second switching circuit, and power is supplied to the 3A from the main power supply unit 50 via the selected circuit. Further, power is supplied to the phototransistor Q70 of the water detector 52 via the constant voltage circuit 55. The constant voltage circuit 55 serves as both the first constant voltage circuit and the second constant voltage circuit of claim 4.

The water detector 52 is the water detector 12 of the first embodiment.
The same as the above, which has an LED 76 and a phototransistor Q70, and detects water by utilizing the fact that the refractive indices of air and water are different. Similar to the comparison unit 13 of the first embodiment, the comparison unit 53 also has a threshold value generation circuit 53A and a comparison circuit 53B, and the value of the output signal of the water detection unit 53 and the threshold value generated by the threshold value generation circuit 53A. Are compared by the comparison circuit 33B, and a voltage corresponding to the magnitude is output to the signal processing display unit 54. The signal processing display unit 54 measures, displays, and stores the integrated used flow rate and the integrated used time based on the signal output from the comparison unit 53.

Next, the operation of the electronic circuit of this water purifier will be described with reference to the electronic circuit diagram of FIG. Constant voltage circuit 55
Supplies the power by stabilizing the output voltage of the main power supply unit 50 by the Zener diode D64 and the diode arranged in the forward direction. The first constant current circuit 56A stabilizes the output current of the main power supply unit 50 by the FET Q72 and the resistor R78 and supplies electric power. The second constant current circuit 56B stabilizes the output current of the main power supply unit 50 by the FET Q70 and the resistor R76 and supplies electric power.

Zener diode D of the first switching circuit 58A
62 and the Zener diode D60 of the second switching circuit 58B have the same breakdown voltage. When the output voltage of the main power supply unit 50 is equal to or higher than this breakdown voltage, the first switching circuit 58A outputs NAN.
The output voltage of the D gate circuit 72 becomes "low", and the NAN
The output voltage of the D circuit 74 becomes "high". Therefore, the transistor Q64 and the electromagnetic relay 64 are turned on, and the main power source section 50 causes the LED 7 to pass through the constant voltage circuit 55.
Power is supplied to 6. At this time, also in the second switching circuit 58B, the output voltage of the NAND gate circuit 68 becomes "low" and the output voltage of the NAND gate circuit 70 becomes "high". Therefore, the transistor Q60 and the electromagnetic relay 60 are turned on, and the threshold value generation circuit 53A of the comparison unit 53 from the main power supply unit 50 is turned on via the constant voltage circuit 55.
Is powered.

On the contrary, when the output voltage of the main power supply section 50 is smaller than this breakdown voltage, the output voltage of the NAND gate circuit 72 becomes "high" and the output voltage of the NAND gate circuit 74 becomes "low" in the first switching circuit. Become. Therefore,
The transistor Q66 and the electromagnetic relay 66 are turned on, and power is supplied from the main power source unit 50 to the phototransistor Q70 of the water detection unit 52 via the first constant current circuit.
At this time, also in the second switching circuit 58B, the NAND
The output voltage of the gate circuit 72 becomes "low", and the output voltage of the NAND gate 74 becomes "high". Therefore, the transistor Q62 and the electromagnetic relay 62 are turned on, and the main power source unit 50 changes to the comparison unit 53 via the second constant current circuit 55.
Power is supplied to the threshold value generating circuit 53A.

As described above, according to the output voltage of the main power source unit 50, the LED 76 of the water detecting unit and the threshold value generating circuit 53B of the comparing unit 53 are supplied with a constant voltage power or a constant current power. The output voltage of the main power supply unit 50 when switching is a DC voltage of about 3V. In addition, the water detector 52
The phototransistor Q10 is constantly supplied with electric power of a constant voltage from the main power source section 50 through the constant voltage circuit 55.

The water detector 52 is the water detector 1 of the first embodiment.
Similar to 2, the emitter-collector voltage of the phototransistor Q10, which changes depending on whether or not water exists in the water channel, is output to the comparison unit. The signal output to the comparison unit 53 is compared with the threshold value in the comparison circuit 53B of the comparison unit 53 as in the case of the first embodiment, and the voltage corresponding to the magnitude is output to the signal processing display unit 54.

In the third embodiment, when the output voltage of the main power source section 50 is high, a constant voltage power is supplied to the LED 76 of the water detecting section 52 and the threshold value generating circuit 53A of the comparing section 53 via the constant voltage circuit 55. I am trying to supply it. When the output voltage of the power supply is low, a constant current power is supplied to the LED 76 of the water detection unit 52 and the threshold value generation circuit 53A of the comparison unit 53 via the first constant current circuit 56A and the second constant current circuit 56B. I have to. By using the constant voltage circuit 55 when the output voltage of the main power supply unit 50 is high, it is possible to supply electric power with the voltage fluctuated by the influence of the surrounding pulse signal being a constant voltage. When the output voltage of the power supply is low, the first constant current circuit 56A and the second constant current circuit 56B are used to supply the electric power while minimizing the variation in the current that is noticeable due to the low output voltage of the power supply. be able to. Therefore, fluctuations in the output signal value of the water detector 52 and the threshold value of the comparator 53 can be minimized.

In the above three embodiments, the main power supply units 10 and 3 are used.
Power may be supplied from 0, 50 directly to the threshold value generation circuits 13A, 33A, 53A of the comparison units 13, 33, 53, but the constant voltage circuits 16, 35, 55 or the second constant current circuit 53A may be used. Through the threshold value generation circuits 13A, 33A,
A stable threshold value cannot be obtained as compared with the case where power is supplied to 53A. Constant voltage circuit 16 of the above three embodiments,
Zener diodes D10, D34, and D6 are provided for 35 and 55.
4, the diodes D12, D36, and D66 are used, but a circuit using a switching type or dropper type regulator and another circuit having the same function may be used. The constant current circuit 36, the first constant current circuit, and the second constant current circuit include FETs Q32, Q72, Q70, and a resistor R.
Although 30, R78 and R76 are used, other circuits may be used as long as they have the same function. Although the pulse generation circuit 37 of the second embodiment is used for the constant current circuit 36, it may be used for a constant voltage circuit.

[0032]

As described above, according to the present invention, a constant voltage power or a constant current power is supplied to the element or circuit means of the water detecting section through the constant voltage circuit means or the constant current circuit means. The output signal value of the water detector does not rise or fall with respect to the threshold value used as a reference for judging the water passing or non-water passing state of the water purifier, and the water passing state does not It is not judged as being in a state or vice versa. When the electric power is supplied to the threshold value generating circuit means of the comparing section through the constant voltage circuit means or the constant current circuit means as in claim 2, the fluctuation of the threshold value can be suppressed to a minimum, which is further advantageous. Goes up. It is possible to save power consumption by intermittently driving the constant voltage circuit means or the constant current circuit means with the pulse generation circuit means as in the third aspect.

When a power source such as a battery whose output voltage decreases with power consumption is used as the power source of the electronic circuit of the water purifier, the constant voltage circuit means or the constant current circuit according to claim 4 is used. Even if the output voltage of the power supply drops, the water supply state is maintained by switching to either one of the means and supplying power from the power supply to the elements and circuits of the water detection section and the threshold value generation circuit means of the comparison section. And the non-water flow state is accurately identified.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment for explaining an electronic circuit of a water purifier of the present invention.

FIG. 2 is an electronic circuit diagram of a water detector 12, a threshold value creating circuit 13A, a comparison circuit 13B, and a constant voltage circuit 16 of the first embodiment for explaining the electronic circuit of the water purifier of the present invention.

FIG. 3 is a block diagram of a second embodiment for explaining the electronic circuit of the water purifier of the present invention.

FIG. 4 is a view showing an electronic circuit of the water purifier of the present invention in the second embodiment, which includes a water detector 32, a threshold value creating circuit 33A, a comparing circuit 33B, a constant voltage circuit 35, a constant current circuit 36, and a pulse generating circuit 37. It is an electronic circuit diagram of.

FIG. 5 is a block diagram of a third embodiment for explaining the electronic circuit of the water purifier of the present invention.

FIG. 6 is a view showing an electronic circuit of the water purifier of the present invention, which is a third embodiment of the water detecting section 52, a threshold value creating circuit 53A, a comparing circuit 53B, a constant voltage circuit 55, a first constant current circuit 56A, and a second constant current circuit 56A.
It is an electronic circuit diagram of constant current circuit 56B, the 1st switching circuit 58A, and the 2nd switching circuit.

[Explanation of symbols]

10, 30, 50 Main power supply section 12, 32, 52 Water detection section 13, 33, 53 Comparison section 13A, 33A, 53A Threshold value creation circuit 13B, 33B, 53B Comparison circuit 14, 34, 54 Signal processing display section 16 , 35, 55 constant voltage circuit section 18, 40, 78 operational amplifier 20, 42, 44, 68, 70, 72, 74, 80 positive logic NAND gate circuit 22, 76 LED 36 constant current circuit section 37 pulse generation circuit section 46 negative Logic NOR gate circuit 48 Pressure sensor 49 Differential amplifier 56A First constant current circuit 56B Second constant current circuit 58A First switching circuit 58B Second switching circuit 60, 62, 64, 66 Electromagnetic relay 90 Signal transmission path 91 Power transmission path C10, C12, C30, C34, C36, C40 capacitors D10, D34, D60, D62, D64 Na diodes D12, D30, D32, D36, D66 diode pr1, pr2, pr3, pr4 strain gauges R10, R12, R14, R18, R20, R22, R
24, R26, R31, R32, R34, R35, R3
6, R38, R40, R42, R44, R46, R4
8, R50, R52, R60, R62, R64, R6
6, R68, R70, R72, R74, R76, R7
8, R80, R88, R90, R92, R94, R96
Resistor R16, R30, R76, R78, R84 Variable resistor Q10, Q70 Phototransistor Q30, Q60, Q62, Q64, Q66 Transistor Q32, Q70, Q72 FET

Claims (4)

[Claims] 1. A water detection unit, a comparison unit for comparing the value of the output signal of the water detection unit with a threshold value for identifying the water flow state and the water non-flow state of the water purifier, and the comparison unit. The signal processing and display unit that measures, displays, and stores the total used flow rate or the total used time based on the output signal of the unit, and a constant voltage for supplying a constant voltage power from a predetermined power source to part or all of the water detection unit. An electronic circuit of a water purifier having one or both of a voltage circuit means and a constant current circuit means for supplying a constant current power to a part or all of the water detection unit. 2. Threshold value creating means for creating the threshold value is provided, and for supplying a constant voltage power to the threshold value creating means from the predetermined power source or another power source. The electronic circuit of the water purifier according to claim 1, further comprising second constant voltage circuit means or second constant current circuit means for supplying a constant current power. 3. A pulse generator circuit for intermittently driving the constant current circuit means or the constant voltage circuit means to intermittently supply electric power from the predetermined power source to a part or all of the water detection unit. The electronic circuit of the water purifier according to claim 1, further comprising means. 4. A water detecting unit, and a threshold value creating means for creating a threshold value for identifying a water passing state and a water non-passing state of the water purifier, and further comprising an output signal of the water detecting unit. A comparing section having a comparing means for comparing a value with the threshold value; a signal processing display section for measuring, displaying and storing an integrated used flow rate or an integrated used time based on an output signal of the comparing section; First constant voltage circuit means for supplying a constant voltage power to a part or all of the water detection unit; second constant voltage circuit means for generating a constant voltage power from the predetermined power source; First constant current circuit means for generating a constant current power from a predetermined power source, second constant current circuit means for generating a constant current power from the predetermined power source, and output voltage of the predetermined power source According to the first constant voltage circuit means or the first First switching means for switching to either one of the constant current circuit means to supply electric power from the predetermined power source to the predetermined part of the part of the water detecting section, and depending on the output voltage of the predetermined power source. A water purifier having a second switching means for switching to either the second constant voltage circuit means or the second constant current circuit means to supply electric power from the predetermined power source to the threshold value generating means. Electronic circuit.