JP3539458B2 - Power supply for electrolyzed water generator - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a DC voltage power supply for an electrolytic cell in an electrolyzed water generator that continuously generates anode water and cathode water by electrolyzing raw water such as tap water.
[0002]
[Prior art]
The electrolyzed water generator separates the electrolytic cell into a cathode chamber and an anode chamber with a diaphragm, inserts electrodes into each chamber, and electrolyzes the raw water supplied to the pole chamber by energization between the electrodes, so that the cathode water flows into the cathode chamber. To generate anodic water electrolytically in the anode chamber.
In the field of food and medical treatment, the anode water obtained by electrolyzing raw water is used as washing water, disinfecting and sterilizing water in accordance with the electrolyticity and properties of water quality defined by the composition and pH of various ions contained in the anode water. You. Cathode water is used as drinking water.
In order to obtain electrolyzed water having a desired degree of electrolysis, a desired electrolyzed water is obtained by using a method of controlling an electrolysis voltage applied between the negative and positive electrodes.
[0003]
As a DC voltage power supply device for supplying a conventional electrolytic cell, a predetermined tap for varying the output voltage is provided on the secondary side of a power transformer for obtaining a DC voltage to be applied between the negative and positive electrodes of the electrolytic cell. A means for selecting is provided to obtain a desired voltage and to apply the voltage between the negative and positive electrodes.
[0004]
Apart from this, there is an apparatus using a pulse width control type switching regulator (PWM) for controlling a DC voltage corresponding to a pulse width. For example, Japanese Patent Application Laid-Open No. HEI 5-115875 includes an electrolytic control switch that generates an output signal that changes steplessly, and a control unit that operates a PWM connected in a power supply circuit. In addition, the control unit sets the pulse width in proportion to the output signal of the driver for turning on / off the PWM, the transmitting means and the electrolytic adjustment switch, and outputs the pulse signal to the driver.
[0005]
In the above-described apparatus shown in FIG. 3, the power supply circuit of the DC power supply applied to the negative anodes 3 and 2 of the electrolytic cell 1 is such that the AC power supply 11 enters the rectifier circuit 14 via the bimetal thermo 13 for overheating protection of the power transformer 12. The positive and negative electrodes on the output side are connected to the PWM 16 via the smoothing capacitor 15. The output side of the PWM 16 is connected to the negative anodes 3 and 2 via a power cutoff switch 17 and a polarity inversion switch 18, respectively.
Another secondary side of the power transformer 12 is connected to a constant voltage circuit 21 via a rectifier circuit 19 and a smoothing capacitor 20 to obtain control power, and the constant voltage circuit 21 is connected to a control unit 22. A predetermined voltage is supplied.
[0006]
The control unit 22 receives a signal from a flow sensor in the flow path of raw water supplied to an electrolytic cell (not shown), and turns on / off the power cutoff switch 17 by the relay 24. In response to the backwash instruction, the polarity inversion switch 18 is switched to the reverse connection position by the relay 25 to reverse the voltage applied to the negative anodes 3 and 2 to remove the scale of the electrolytic cell.
[0007]
The control unit 22 includes an oscillating unit 25 and a pulse width control unit 26 to which a pulse signal of a predetermined frequency is input from the oscillating unit 25. The output voltage of the electrolytic adjustment switch 27 is input to the pulse width control unit. You. Then, the pulse width is adjusted steplessly with respect to the output voltage, and the pulse current at the outlet of the rectifier circuit 14 is intermittently controlled without consideration of the zero cross through the driver 28 constituting a part of the PWM 16.
[0008]
[Problems to be solved by the invention]
The electrolysis power supply in the conventional electrolyzed water generator has the following problems.
(I) Two relays are used as the polarity reversing switch 18, which is large and expensive. Also, since it is a contact type, it is not suitable for explosion-proof specifications.
(Ii) Since many circuits are connected to the transformer 12 and many lead wires from the transformer 12 are required, the wiring is complicated.
(Iii) The configuration of the control circuits 16 and 22 for the DC voltage applied to the electrodes is complicated, and is provided on the secondary side of the transformer 12, which causes the item (ii).
(Iv) The rectifier circuit 14 employs a full-wave rectification system. In order to switch the polarity of the DC voltage, the rectifier circuit 14 must be a bipolar switching system, and a bipolar inversion switch 18 is used (i). Causes the term. In addition, since a full-wave rectification system in which four diodes are driven at all times is used, a large amount of heat is generated.
[0009]
An object of the present invention is to solve the above-mentioned problems of the conventional apparatus, and to provide an inexpensive power supply for an electrolyzed water generator that has a simple configuration, a high performance, a non-contact type, and is inexpensive.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 divides an electrolytic cell into a cathode chamber and an anode chamber by a diaphragm, provides electrodes in each chamber, and provides an electrolytic power supply for applying a predetermined DC voltage between the electrodes. An electrolyzer that electrolyzes raw water supplied into the electrolytic cell by energization between the electrodes to generate cathodic water in a cathode chamber and anodic water in an anode chamber, wherein the electrolysis power supply has a center tap on a secondary side. A transformer, a diode bridge circuit having a pair of terminals connected to a secondary side of the transformer, two sets of switch means connected to another pair of terminals of the diode bridge circuit, and connection of the switch means The gist includes a circuit for connecting a point and the center tap to each of the electrodes, an electrode inversion control circuit for turning on and off the switch means, and a control means for the DC voltage.
[0011]
According to a second aspect of the present invention, in the power supply according to the first aspect of the present invention, the DC voltage control means includes a triac inserted on a primary side of the power transformer, and a phase control circuit for controlling a conduction phase of the triac. , Is included.
[0012]
According to a third aspect of the present invention, in the power supply according to the first or second aspect, the switch means includes a power MOS-FET element.
[0013]
According to a fourth aspect of the present invention, in the power supply of the second aspect, the phase control circuit includes a plurality of triac photocouplers connected in parallel, and an output of the triac photocoupler is connected to the triac via a bidirectional switch element. The gist is that a pH control signal is supplied to each of the triac photocouplers.
[0014]
According to a fifth aspect of the present invention, in the power supply according to the fourth aspect, the phase control circuit further includes a hysteresis reducing circuit, and the hysteresis reducing circuit is connected between the triac photocoupler and the bidirectional switch element. The gist is that it has been done.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
In the embodiment of the present invention, as shown in FIG. 1, the power transformer 32 has a center tap 32a on the secondary side, and the center tap 32a is connected to one electrode 36a of the electrolytic cell 36. ing. One pair of terminals 33a of the diode bridge circuit 33 is connected to the power transformer 32, and the other pair of terminals 33b is connected to two sets of switch elements 34 and 35. The other electrode 36b of the electrolytic cell 36 is connected to a connection point 38 of the switch elements 34 and 35.
The diodes D _{1 to} D ₄ built in the diode bridge circuit 33 by the above-described configuration are used two by two with the same polarity, and function as a double-wave rectifier circuit based on the center tap 32 a of the power transformer 32. , the switch element 34 ₊ + DC voltage E, the switch element 35 E _- supplying a DC voltage.
Therefore, the polarity of the DC voltage applied to the electrodes 36a and 36b of the electrolytic cell 36 can be inverted by turning on and off the switch elements 34 and 35 by the electrode inversion control circuit 37.
[0016]
According to an embodiment of the present invention, a triac 30 is provided on the primary side of a power transformer 32 as the DC voltage control means, and the conduction phase thereof is controlled by a phase control circuit 31.
[0017]
In the embodiment of the present invention, power MOS-FET devices are used as the switching devices 34 and 35.
[0018]
In the embodiment of the present invention, as shown in FIG. 2, three parallel connected triac photocouplers 39a, 39b and 39c are used as the phase control circuit 31, and the output of the triac 30 is controlled.
[0019]
In the fifth embodiment, the outputs of the triac photocouplers 39a to 39c are supplied to the gate 30G of the triac 30 via the hysteresis reducing circuit 40.
[0020]
【Example】
Hereinafter, embodiments of the present invention shown in the drawings will be described.
FIG. 1 shows an embodiment of a power supply for an electrolyzed water generator of the present invention. In the figure, AC is a 100 V AC power supply, 30 is a triac, 31 is its phase control circuit, 32 is a power transformer, and has a center tap 32a on its secondary side. A diode bridge circuit 33 has a pair of terminals 33a connected to the secondary side of the power transformer 32, and another pair of terminals 33b connected to one ends of the switch elements 34 and 35. The connection point 38 at the other end of the switch elements 34 and 35 is connected to one electrode 36a of the electrolytic cell 36, and the center tap 32a of the power transformer 32 is connected to the other electrode 36b.
[0021]
As the switching elements 34 and 35, for example, power MOS-FET elements are used, and the respective gates 34G and 35G are connected to the electrode inversion control circuit 37.
When the switch element 34 or 35 is turned on or off by the electrode inversion control circuit 37, the double-wave rectified + or-DC voltage E ₊ or E ₋ output from the diode bridge circuit 33 with reference to the center tap 32a. Is applied to the electrodes 36b and 36a. That is, the diodes D _{1 to} D ₄ of the diode bridge circuit 33 are used two by two with the same polarity, and the radio wave rectification circuit has two circuits of + and − with respect to the center tap 32a.
[0022]
FIG. 2 shows a specific configuration example of the phase control circuit 31 and the electrode inversion control circuit 37. In the figure, the phase control circuit 31 includes, for example, three triac photocouplers 39a, 39b, 39c connected in parallel, a hysteresis reducing circuit 40, and a bidirectional switch element 41.
[0023]
The inputs of the triac photocouplers 39a, 39b, 39c are supplied with, for example, pH control signals A, B, C via a microcomputer, respectively. When 39b and 39c are turned on, different currents are given to the gate 30G of the triac 30 via the bidirectional switch element 41 and triggered. That is, the triac photo-coupler 39a, 39 b, connected to the primary side of the power transformer 32 via a resistor R _1, R _2, R ₃ and resistor R ₄ connected in parallel to the input of each output side of the 39c, each output The output connection point on the side is connected to the gate of the triac 30 via the hysteresis reducing circuit 40 and the bidirectional switch element 41. pH control signals A, B, triac photo-coupler 39a which any of C corresponding, 39b, when given to 39c, the resistors R _1, R _2, R ₃ and phase delay circuit comprising the capacitor C of hysteresis reduces circuit 40 Although the charging or discharging current flows, there is a difference in the rise or fall time due to the phase difference according to each time constant, and therefore, the energization phase of the triac 30 triggered by the current is different, so that the DC The voltage can be changed.
[0024]
Then the electrode inversion control circuit 37, for example, a photocoupler 42a, 42b, transistors 43a, 43b, a diode D ₅ to D _8, photocoupler 42a, the one end of the input of the 42b control voltage is applied to the other end An acid or alkali signal from the microcomputer or the like is provided. For example, when an acid signal is applied, the output of the photocoupler 42a is turned on to trigger the power MOS-FET 34, and when the + DC voltage E ₊ is applied to the electrode 36a of the electrolytic cell 36 and an alkali signal is applied, the photocoupler 42a is activated. output 42b is a power MOS-FET 35 is turned on is triggered, the - DC voltage E _- is the electrode 36b of the cell 36, are respectively applied.
[0025]
In the present invention, the means for controlling the DC voltage is not limited to the method of the above-described embodiment, but may employ various methods. Further, the hysteresis reducing circuit controls the phase of the inductive load (power transformer), so that it is good to reduce the inrush current to the triac, and is not essential.
[0026]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained as a power source for an electrolyzed water generator.
(I) Since the output voltage of the power transformer can be fixed to two power supplies of + and-with respect to the center tap, the wiring can be simplified.
(Ii) Although a diode bridge is used as the rectifier circuit, since ± power is obtained by the secondary-side dual-wave rectification method, the voltage applied to the electrode of the electrolytic cell can be inverted by switching only one electrode. The structure of the reversing means is simplified.
(Iii) Since the double-wave rectification method can supply the same power as the conventional bridge full-wave rectification method to the electrolytic cell, it is effective in suppressing the heat generated in the diode of the diode bridge.
(Iv) Since there is no need to use a relay for reversing the electrodes, a non-contact type circuit can be provided, and explosion-proof specifications can be achieved.
(V) Cost can be reduced because the number of components is reduced overall.
(Vi) If a primary side phase control method of a power transformer by a triac is adopted as a DC voltage control method, pH control can be performed at random.
[Brief description of the drawings]
FIG. 1 is a block diagram showing one embodiment of the present invention.
FIG. 2 is a circuit diagram showing a specific example of a circuit configuration of the embodiment.
FIG. 3 is a block diagram showing an example of a conventional power supply for an electrolyzed water generator.
[Explanation of symbols]
Reference Signs List 30 Triac 31 Phase control circuit 32 Power transformer 32a Center tap 33 Diode bridge 34, 35 Switch element 36 Electrolyte tanks 36a, 36b Electrode 37 Electrode inversion control circuit

Claims (5)

The electrolytic cell is divided into a cathode chamber and an anode chamber by a diaphragm, electrodes are provided in the respective chambers, and an electrolytic power source for applying a predetermined DC voltage between the electrodes is provided to supply raw water supplied into the electrolytic cell between the electrodes. In an electrolysis device that generates electrolyzed electricity by conducting electricity and generates cathode water in the cathode chamber and anode water in the anode chamber,
The electrolytic power supply includes a power transformer having a center tap on a secondary side, a diode bridge circuit having a pair of terminals connected to a secondary side of the transformer, and another pair of terminals connected to the diode bridge circuit. Two sets of switch means, a circuit for connecting a connection point of the switch means and the center tap to each of the electrodes, an electrode inversion control circuit for turning on and off the switch means, and a control means for the DC voltage, A power supply for an electrolyzed water generator, comprising: 2. The electrolytic water according to claim 1, wherein the DC voltage control unit includes a triac inserted on a primary side of the power transformer, and a phase control circuit that controls a conduction phase of the triac. 3. Power supply for generator. The power supply for an electrolyzed water generator according to claim 1 or 2, wherein the switch means has a power MOS-FET element. The phase control circuit includes a plurality of triac photocouplers connected in parallel, an output of the triac photocoupler is connected to the triac via a bidirectional switch element, and a pH control signal is given to each of the triac photocouplers. The power supply for an electrolyzed water generator according to claim 2, characterized in that: The electrolysis water according to claim 4, wherein the phase control circuit further includes a hysteresis reducing circuit, and the hysteresis reducing circuit is connected between the triac photocoupler and the bidirectional switch element. Power supply for generator.

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