JPH06170370A - Electrolytic current control device of ion water generator - Google Patents

Abstract

PURPOSE:To minimize a pH value variation range by compensating for variations of flow rate, voltage, temperature and frequency in the pH adjustment control of an ion water producer. CONSTITUTION:The electrolytic current control device of an ion water generator sets the electrolytic mode voltage of an electrolytic voltage control part 1, and also sets the electrolytic mode current reference value of a comparator 5 by selecting between voltagedividing resistors R1, R2 and setting resistors R3 to R6 by ON/OFF selection of reference value setting circuits Tr1 to Tr5. Electric action is initiated by turning FET 3 On, then the electric current of an electrolytic tank 2 is detected as both terminal voltages of a source resistor 4, and the electric current is adjasted by FET control and the voltage is addjusted by the voltage control part 1 based on an electric current value input at which an electric current value is determined by the comparator 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic current controller for detecting an electrolytic current in an ionized water generator to correct the pH value of the generated water.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a conventional ionized water generator. A control unit 35 controls a predetermined electrolysis mode (electrolysis mode 1 to 4 stages of electrolysis) based on pH value, flow rate data, etc. under the control of a microcomputer. (Mode 3 is set as 24V) is set by sending a voltage control signal to the voltage control unit 30, an electrolytic ON signal is sent to the FET 32 via the driver 34, and the electrolytic power supply 24V of mode 3 is set to the electrolytic cell 31. Apply to start electrolysis.

When the pH value of the produced ionized water does not reach the set value, the voltage control 3 is performed by the voltage value control.
Increase the output voltage of 0 (eg 28V in electrolysis mode 4
To) voltage adjustment, pH adjustment. F during electrolysis
When an overcurrent is detected as a current value input by monitoring via the voltages R1 and C1 across the source resistance 33 of the ET 32,
The FET 32 is turned off to protect the electrolytic cell 31 for cutting off the electrolytic current.

[0004]

However, in the prior art shown in FIG. 4, since the pH adjustment is performed by the voltage adjustment of the voltage control unit 30 referring to the pH value of the produced water, the production of the ion water generator is performed. PH of ionized water
However, it is relatively large due to changes in flow rate during electrolysis after the electrolysis level is set, changes in water temperature, changes in electrolysis voltage due to changes in power supply voltage, and changes in frequency. There is a problem that the correction process for pH adjustment is not performed.

The present invention has been made in view of the above-mentioned problems, and it is effective to detect an electrolytic current corresponding to each electrolysis mode and add pH correction by adjusting the electrolytic current.
An object of the present invention is to provide an electrolytic current control device for an ion water generator capable of H adjustment.

[0006]

In order to achieve the above object, the present invention relates to an ion water generator for generating alkaline ionized water and acidic water by electrolysis by applying an electrolysis power supply voltage to an electrolysis cell and FET for OFF and the FET
Source resistance connected between the source and ground to detect an electrolysis current, an integration circuit for averaging the voltage across the source resistance, and the output of the integration circuit are input to determine the current value for each electrolysis mode. The Vcc voltage dividing resistor in which one of the parallel connection resistor and the parallel connection resistor is turned on / off by the transistor switch, and the number of ladder parallel connections is turned on / off by each transistor switch.
The reference value setting circuit for setting the current reference value for each electrolytic mode of the comparator and the transistor switches of the reference value setting circuit are turned on by the Vcc voltage division by the n voltage setting resistors. By turning on / off the reference value setting signal transmission and varying the voltage dividing resistance value and the voltage setting resistance value, the current reference value for each electrolytic mode of the comparator is set, and the current from the comparator is set. Adjusting the electrolytic voltage by controlling the voltage value by judging the value input, and the electrolytic ON / O of the FET
It is characterized in that a control unit for adjusting the electrolytic current by the FF duty control is provided.

[0007]

With the above configuration, the control unit sets a predetermined electrolysis mode as an applied voltage to the electrolytic cell, and sets the current reference value of the comparator which is variably set corresponding to the electrolysis mode set at the same time. This is performed by selecting the transistor switch of the reference value setting circuit to be turned on and selecting the voltage dividing resistance value and the voltage setting resistance value. Turn on FET
Then, the electrolysis is started, and the voltage across the source resistance of the FET is averaged by the integrating circuit and input to the comparator. The comparator compares this input with the set reference value and outputs it as a current value input to the control unit. The control unit judges the input of the current value and controls the electrolysis mode, and also controls the current by controlling the duty to the FET. Therefore, the current control enables the correction control of the pH adjustment due to the fluctuation factors such as the flow rate, the voltage, and the frequency. .

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an electrolytic current control device for an ionized water generator according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 is an electrolysis voltage control section for adjusting the electrolysis power source to the electrolysis cell to a predetermined electrolysis mode and outputting it. Reference numeral 2 is an electrolytic cell, 3 is a FET for turning on / off the electrolysis, and 4 is a source resistor for detecting an electrolytic current, which is connected between the source of the FET 3 and ground.

Reference numerals R7, C7, R8, and C8 denote integrating circuits, and 5 denotes a comparator for inputting an output of the integrating circuit for determining an electrolytic current. The reference value setting of the comparator 5 is R1 which is directly connected to Vcc of the reference value setting circuit, and R is connected in parallel to R1 when the transistor switch Tr1 is turned on.
R3 that divides the reference voltage of the comparator 5 at the series connection point with R1 and R2 by turning on the voltage dividing resistor and the transistor switch Tr2 by R2, and R3 by turning on each of the transistor switches Tr3, Tr4, and Tr5.
The respective electrolysis mode current reference values corresponding to the electrolysis mode set in the electrolysis voltage control unit 1 are set by the combination with the ladder-like voltage setting resistors constituted by R4, R5 and R6 which are connected in parallel to each other. . Although the electrolytic current setting value is set by hardware, if the A / D input of the microcomputer has sufficient accuracy, it can be input as it is by software.

Reference numeral 6 sets a predetermined electrolysis mode in the electrolysis voltage control unit 1, controls ON / OFF of the FET 3 via the driver 7 by an electrolysis ON / OFF signal, sets a current reference value, and controls the voltage by inputting a current value. And FE
This is a control unit that performs current control by control of T3 by a microcomputer.

Next, the operation will be described. The control unit 6 is p
The electrolysis voltage control unit 1 sends out a voltage value control signal in a predetermined electrolysis mode from data such as H and flow rate value.
Set to (mode 4 as electrolysis mode 1 to 4)
Is set to 28V).

If the electrolysis mode current value corresponding to the set electrolysis mode 4: 28V is set to 2A (the current value changes again in other modes), the corresponding reference value is Tr1 of the setting circuit.
~ Tr5 is selected and set in the comparator 5 by a current reference value setting signal which is turned on. For example, in electrolysis mode 4, Tr2 is ON and Tr1, Tr3, Tr4, Tr5 are OF.
In F and electrolysis mode 3, Tr2 and Tr3 are ON and Tr1,
Tr4, Tr5 are OFF, in electrolysis mode 2, Tr1,
Tr2, Tr3, Tr4 are on and Tr5 is off. In electrolysis mode 1, Tr1, Tr2, Tr3, Tr4, Tr
5 is a setting such as turning on all.

In FIG. 1, four voltage control resistors R3 to R6 are illustrated and described as modes 1 to 4, but 4
Since it is one resistor (or Tr), the actual setting number is 2 ⁴
It is possible to set the reference value up to = 16 ways, and if the number of resistors is n without setting the electrolysis mode for voltage control steplessly, it is possible to set 2 ⁿ ways even finer. If the number of voltage dividing resistors R2 (or Tr1) is increased, the voltage dividing ratio can be similarly subdivided, and the number of setting steps is further increased.

In this way, the reference value for judging the current value 2A for the electrolytic mode 4 of the comparator 5 is T
It is set by turning on r2 and Tr3. Comparator 5
When the setting of the reference value of is completed, the electrolysis ON / OFF signal is sent to the gate of the FET 3 via the driver 7 to be turned on to start electrolysis. When an electrolytic current flows in the electrolytic cell 2 by electrolysis, a voltage proportional to both ends of the source resistor 4 is detected, and the voltage is averaged by the integrating circuits R7, C7, R8, C8 and input to the comparator 5.

The comparator 5 determines the electrolysis current 2A in the electrolysis mode 4 and notifies the control unit 6 as a current value input. In the case of 2 A or less, the control unit 6 raises the voltage by voltage value control to perform voltage correction control, and raises the ON / OFF duty sent to the FET 3 to control current. On the contrary, in the case of 2 A or more, the electrolytic current value is controlled so as to be lowered so that the electrolytic current value becomes constant. In this way, correction for changes in flow rate, voltage, frequency, temperature, etc. is performed to generate ionized water having a constant pH.

Next, as another embodiment, an example will be shown in which an operational amplifier as shown in FIG. 2 is inserted in place of the comparator 5 of the previous embodiment and the output is directly processed by the microcomputer. Electrolyzer 2
After the electrolysis is started, the electrolysis current is detected by the voltage across the source resistor 4 and is input to the operational amplifier 10 via the integrating circuit.

From the operational amplifier 10, a current value input including fluctuations due to fluctuations in flow rate, voltage, frequency, etc. as shown in FIG. 3 is output to the control section 6. The microcomputer of the control unit 6 uses sample data ao sampled at a constant cycle t.
Is calculated for the fixed time T to determine the electrolysis current value, and is compared with the current value data corresponding to the set electrolysis mode at that time to control the voltage and current.

When the fluctuation is large, the fixed time T is set to a short time so as to quickly respond to the correction processing, and when the fluctuation is small, a long time is set. Therefore, the microcomputer may judge the fluctuation data of the test period and automatically select the cycle time T. In this case, it is possible to make more variable-value corrections, but software processing by a microcomputer is mainly used.

In this embodiment, the electrolytic current is detected as the voltage across the source resistance 4 of the FET 3,
The current reference value, which is variably set according to the electrolysis mode of the comparator 5, is set by the reference value setting circuit.
The control unit 6 judges the input of the current value to control the voltage and current, or inputs the voltage across the source resistor 4 to the control unit 6 via the operational amplifier 10, and the microcomputer directly judges the current value. Since the voltage and current are controlled, it is possible to perform the correction control of the fluctuation of the pH value caused by the fluctuation of the flow rate, the voltage, the frequency, the water temperature and the like. Further, as an application of the above, the duty ratio of the FET is ON / O at the time of overcurrent.
It is also possible to control the pseudo fold-back characteristic by software by reducing the FF.

[0021]

As described above, according to the present invention,
FET for electrolysis ON / OFF in ion water generator
, The source resistance of the FET connected to the source and ground to detect the electrolysis current, the integration circuit for averaging the voltage across the source resistance, and the output of the integration circuit to input the current value for each electrolysis mode. One of the judgment comparator and parallel connection resistor is turned on / off by a transistor switch.
The number of ladder-like parallel connections is ON / OFF due to the Fcc voltage dividing resistance to be F and each transistor switch.
ON / OFF of the reference value setting circuit for setting the current reference value for each electrolytic mode of the comparator and each transistor switch of the reference value setting circuit by Vcc voltage division with the n voltage setting resistors Select the reference value setting signal transmission to change the voltage dividing resistance value and the setting resistance value to set the current reference value for each electrolytic mode of the comparator, judge the current value input from the comparator, or Since it has a control unit that directly processes the input via the microcomputer to control the voltage and current, the pH change due to the electrolytic current control corresponding to the flow rate, voltage, frequency, and temperature changes in the ion water generator There is an effect that effective pH adjustment can be performed by the correction control that is stopped within a certain small range.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electrolytic current control device for an ionized water generator according to an embodiment of the present invention.

FIG. 2 is a diagram showing an operational amplifier used in another embodiment of the present invention.

FIG. 3 is an explanatory diagram of a current value input process of the operational amplifier using example shown in FIG.

FIG. 4 is a configuration diagram of a conventional ionized water generator.

[Explanation of symbols]

 1 Electrolytic voltage control unit 2 Electrolyzer 3 FET 4 Source resistance 5 Comparator 6 Control unit 7 Driver Tr1 to Tr5 Transistor switch R1, R2 Voltage dividing resistor R3 to R6 Setting resistor R7, C7, R8, C8 Integration circuit

Claims (1)

[Claims] 1. An ion water generator for generating alkaline ionized water and acidic water by electrolysis by applying an electrolysis voltage to an electrolysis cell, wherein an electrolysis ON / OFF FET is connected between a source and ground of the FET. Source resistance for detecting the electrolytic current, an integrating circuit for averaging the voltage across the source resistance, a comparator for inputting the output of the integrating circuit to determine the current value for each electrolytic mode, and a parallel connection resistor Depending on the Vcc voltage division resistance, one connection is turned on / off by a transistor switch, and the resistance for Vcc voltage division and the n voltage setting resistors whose number of ladder parallel connections is turned on / off by each transistor switch. , A reference value setting circuit for setting a current reference value for each electrolysis mode of the comparator, and each transistor switch of the reference value setting circuit. The reference voltage setting signal transmission for turning on / off the switch is selected to change the voltage dividing resistance value and the voltage setting resistance value to set the current reference value for each electrolysis mode of the comparator. An ionized water generator comprising a control unit for judging an input of a current value from a comparator to adjust an electrolytic voltage by controlling a voltage value and an electrolytic current by controlling an ON / OFF duty of the FET. Electrolytic current control device.