JPH0671266A - Electrolytic power source circuit in ionized water generator - Google Patents

Abstract

PURPOSE:To make the electrolytic power source in an ionized water generator efficient and to conduct overcurrent protection. CONSTITUTION:A constant-voltage power source is turned on to change the resistance of potentiometric resistor R11 by ladder resistors R12, ...R15 and a flow rate resistor R16 with the signal of a CPU 7, and the electrolytic level of an output voltage is made variable. The overcurrent protection threshold value of an overcurrent comparator 6 is simultaneously set in linking with each other by the ladder resistors R20, ...R25, flow rate resistor R26, etc. Either the detected voltage obtained by converting the detected current of a CT 2 by voltage conversion circuits 3, 4 and 5 or the voltage of the R2 terminal of an electrolytic power source ON/OFF transistor Q2 is inputted and compared by the comparator, and, when the current is over, an electrolysis stop signal is outputted from the CPU to conduct PWM and duty ratio control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic power supply circuit for an ionized water generator, and more particularly to an electrolytic power supply circuit including an overcurrent protection treatment for an electrolytic cell.

[0002]

2. Description of the Related Art Conventionally, in an ionized water generator, a regulator-type electrolytic power source is used instead of a transformer tap switching type electrolytic power source which is greatly affected by fluctuations in the power source voltage. FIG. 4 is a circuit diagram of an electrolytic power source for a conventional ionized water generator.

An AC input input from a transformer is rectified by a diode bridge rectifier circuit 100, added to a three-terminal regulator 101, and a voltage dividing resistor R10 of the regulator circuit.
By varying 2 the output voltage Vo can be varied to switch the voltage applied to the electrolytic cell to any number of stages (for example, four stages) to adjust the pH of the ion water and the inflow amount. There is.

If an excessive current flows in the electrolytic cell for some reason, the transistor 105 is turned on by the voltage I.multidot.R1 (I is the current flowing in R1) across the current detection resistor R1, and the transistor 106 turns on the electrolytic power supply. ON / OFF MOS transistor 107 is OF
It becomes F, and the electrolysis is stopped by stopping the electrolysis.

[0005]

However, in the prior art shown in FIG. 4, the DC 10 is used as a 4-step change width change of the electrolytic power source output from the regulator 101.
The range of change is from V to 30 V, and since the electrolytic power supply is divided and set in four levels of electrolysis in this way, the range of change in electrolysis current is 0.7 to 2.5 A. However, the amount of heat generated by the loss of the regulator is also large, and detection by the electrolytic current detection resistor R1 is not sufficient as overcurrent protection processing. Corresponding to the electrolytic current that greatly changes at each stage, a fine overcurrent of the electrolytic power source at each stage is handled. There is a problem that current protection processing is necessary.

The present invention has been made in view of the above-mentioned problems, and performs an overcurrent protection process in conjunction with a set value of an electrolytic power source which is a variable output of a regulator to suppress an excessive loss of the regulator and at the same time, a flow rate. It is an object of the present invention to provide an electrolytic power supply circuit in an ionized water generator that is capable of responding to changes in values and the like.

[0007]

To achieve the above object, the present invention provides a constant voltage circuit for stabilizing the rectified output of a diode bridge, and n stages connected to the output side voltage dividing resistor with the constant voltage as an input. Voltage regulator circuit that variably outputs the electrolysis power supply according to the increase and decrease of the ladder resistance and the flow signal value, the voltage conversion circuit that detects the current of the diode bridge by CT and converts it into the voltage value, and the electrolyzer power supply is turned on.
An overcurrent detection circuit for detecting the source resistance terminal voltage of a MOS transistor for turning on / off, and an electrolysis circuit for the voltage variable regulator circuit, which receives as an input either the detection voltage of the overcurrent detection circuit or the output voltage of the voltage conversion circuit. Equipped with an overcurrent comparator that outputs an overcurrent signal for the electrolysis stop signal output by comparing the increase or decrease of the n-stage ladder resistance that is interlocked with the voltage value and the interlocking overcurrent threshold set by the flow signal value. There is.

[0008]

With the above configuration, the output of the regulator circuit for inputting the constant voltage source is variably set by increasing and decreasing the ladder resistance (ladder connection resistance) and fine adjustment by the flow signal value, and the electrolysis power supply is changed for each electrolysis level. Output. On the other hand, the overcurrent is detected by detecting the current flowing through the diode bridge by CT.
The detected voltage converted to the corresponding voltage by the voltage conversion circuit is input or the power of the electrolytic cell is turned on.
The detection voltage detected by the overcurrent detection circuit is input from the source resistance terminal of the MOS transistor that turns on / off,
The comparison reference value is linked with the electrolysis level set by the ladder resistance and flow rate value in the regulator circuit, and compared with the overcurrent comparator by the overcurrent threshold for each electrolysis level set by the ladder resistance and flow rate value. , If the input voltage is higher than the threshold value, an overcurrent signal is output and CP
Since the electrolysis stop signal is output from U, in addition to protection processing by the current sensor resistance on the electrolytic cell side, overcurrent protection processing corresponding to the electrolysis level and processing corresponding to the flow rate are possible.
An efficient and safe electrolytic power source can be constructed.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of an electrolytic power supply circuit in an ionized water generator according to an embodiment of the present invention.

In FIG. 1, D1 is a diode bridge rectifier circuit, and the constant voltage circuit is composed of a Co smoothing capacitor, a Q5 control transistor, a ZD zener diode, and a C1 output capacitor.

Reference numeral 1 is a three-terminal regulator,
R11 is a voltage dividing resistor that determines the output voltage, D2 is a protective diode for the regulator 1, R12 to R15 are electrolytic level setting ladder resistors, and Q7 to Q10 are ladder resistors R12 to
It is a transistor that turns on and off R15. R16
Is a series resistor for setting the flow rate level, and Q15 is a transistor for changing the resistance value of R16 by turning on / off according to the flow rate value signal.

R1 is an overcurrent detection current sensor, Q1 is an overcurrent detection transistor, and Q2 is an electrolytic power source ON / OF.
F MOS transistor, R2 is source resistance, Q3, Q
Reference numeral 4 denotes an electrolytic ON / OFF signal driver.

Reference numeral 2 is a CT for current detection, and the voltage conversion circuit is composed of 3 operational amplifiers, 4 voltage rectifying circuits, and 5 smoothing circuits. 6 is an overcurrent comparator, Q16 is a flow signal input transistor, resistor R20 and ladder resistors R21 to R2.
The overcurrent protection value corresponding to the electrolytic level is determined by 5, and R
The threshold value of the comparator 6 is determined by finely adjusting the flow rate value via 26. Q11 to Q14 are ladder resistors R22 to R2
5 is a switch transistor. Reference numeral 7 denotes a microcomputer (CPU) that controls the system and outputs an electrolysis level signal, a flow rate value signal, an overcurrent open collector signal (electrolysis stop signal), and an electrolysis ON / OFF signal.

Next, the operation will be described. Within the range defined by D2 which protects the control transistor of the regulator in addition to the regulator 1, the output voltage which is made constant by controlling the base potential of the control transistor Q5 of the constant voltage circuit by the constant voltage by the Zener diode ZD , Ladder R by CPU7 electrolysis level setting signal
The electrolytic power sources of electric field levels 1 to 4 which are set according to the selection of 12 to R15 and the magnitude of the flow rate value signal sent to Q15 are variably output.

Simultaneously with the electrolytic level setting signal and the flow rate value signal sent from the CPU 7, the threshold value of the comparator 6 is set to the voltage dividing resistance of R20 and R21 and the ladder resistance R22.
Depending on the selection of ~ R25 and the flow rate signal level, the electrolysis level of the regulator 1 that is currently set,
It is set as an overcurrent protection threshold at the electrolysis level.

In this case, the ladder resistances R12 to R15 and R22 to R25 are provided in four stages corresponding to the electrolysis levels 1 to 4, but if the stages are increased as shown in the figure, the fine adjustment range can be further increased to 2n steps. CP even at the 4th electrolysis level
Since the voltage step of 24 = 16 steps can be adjusted in the bit step adjusted from U7, the explanation will be made assuming that the electrolysis level is 4 steps.

The flow rate value signal is finely adjusted by adding a PH adjustment value for the current water amount by Q15 and R16 by a detection value of a water pressure sensor (not shown). In conjunction with this, the overcurrent threshold value is corrected by Q16 and R26.

When the electrolysis power is supplied from the regulator 1 to the electrolyzer to start electrolysis, a current (proportional to the electrolysis current value) flowing through the diode bridge is detected by CT2, and the current is detected by the operational amplifier 3 of the voltage conversion circuit. , The DC voltage is converted by the rectifier circuit 4 and the smoothing circuit 5, and is added to the input terminal of the overcurrent comparator 6 (“α” in the figure) and compared with a threshold value (“β”). Input voltage is threshold "β"
When it exceeds, the comparator 6 outputs an overcurrent signal to the CPU 7 as shown in FIG. 2, and the CPU 7 sends an "L" output from the overcurrent open collector port to forcibly turn off Q2 and stop electrolysis. When the overcurrent signal is turned OFF, if the electrolysis ON / OFF signal is "H", or immediately after a certain weight, electrolysis is started to perform electrolysis ON control, duty ratio, or PWM control.

As a method for detecting overcurrent, the voltage conversion circuit is turned off by SW and the circuit shown by the dotted line in FIG.
The terminal voltage between the source resistance R2 of the OS transistor Q2 and GND is detected, and this is used as an input to the comparator 6 as a detection voltage corresponding to the overcurrent. Therefore, when the input voltage of the comparator 6 exceeds the threshold value "β", the overcurrent signal is output and the CPU 7 turns off 2 by the output of the overcurrent open collector board "L". Thus, the current detection can select the detection voltage from the voltage conversion circuit and the source resistance R2, but the R2 detection is closer to the electrolytic cell current.

The operation of the current sensor R1 remains the same, and Q1 is turned on by the overcurrent as in the case of the conventional example.
However, the protection operation of turning off Q2 is left as it is.
If the CPU 7 has a margin in the threshold value setting / comparison circuit including the comparator 6, the detection voltage can be directly input to the CPU 7 by incorporating the CPU 7 therein.

FIG. 3 is a diagram showing another embodiment. The ladder resistance circuit of the regulator 1 and the comparator 6 is shown in FIG.
By using the LED and the variable resistance type CdS photocoupler 8 shown in FIG. 3, it is possible to make the contact resistance and set an arbitrary voltage, so that the ladder resistance of the setting circuit can be simplified.

In this embodiment, the variable output of the regulator 1 is automatically set according to the required electrolysis level and flow rate, and the set electrolysis level is automatically linked to the overflow protection level in accordance with the flow rate value. Is set and the overcurrent protection process is performed, the heat generation amount of the regulator due to the excessive loss is reduced, and the safer overcurrent protection process can be performed, and an efficient electrolysis power supply can be configured. In this example of use, the flow rate is above a certain fixed amount, and is only controlled at the following two points of H and L. However, when the frequency f of H and L is input using the Hall element for rotation of the blade Similar to electrolysis, electrolysis level electrolysis voltage and control current value threshold value comparison can be performed in n stages.

[0023]

As described above, according to this embodiment, the constant voltage circuit for stabilizing the output of the diode bridge rectifier circuit, the n-stage ladder resistance connected to the voltage dividing resistance, and the flow rate value signal are used. A variable voltage regulator circuit that variably outputs the electrolytic power supply, a voltage conversion circuit that converts the diode bridge current detected by CT into a voltage, and an overcurrent that detects the source resistance terminal voltage of the MOS transistor that turns on / off the electrolytic cell power supply. The detection circuit and the detection voltage of this overcurrent detection circuit or the output voltage of the voltage conversion circuit are used as inputs, and are set by the n-stage ladder resistance and the flow signal value that are interlocked with the electrolytic voltage value of the voltage variable regulator circuit. More reliable because it is equipped with an overcurrent comparator that outputs an overcurrent signal for the electrolysis stop signal output by comparing with the interlocking overcurrent threshold value. There is an effect that can be configured for efficient electrolysis power supply circuit that can reduce the amount of heat generated by suppressing the excessive loss of the overcurrent protection and regulator.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an electrolytic power supply circuit in an ionized water generator according to an embodiment of the present invention.

FIG. 2 is a timing chart of power ON / OFF control of the CPU shown in FIG.

FIG. 3 is a circuit diagram showing another embodiment of the present invention.

FIG. 4 is a circuit diagram of an electrolytic power supply circuit in a conventional ionized water generator.

[Explanation of symbols]

 1 Regulator 2 CT 3 Operational amplifier 4 Rectifier circuit 5 Smoothing circuit 6 Overcurrent comparator 7 CPU D1 Diode bridge D2 Protection diode ZD Zener diode R1 Current sensor R2 Source resistance R10, R11, R20, R21 Voltage dividing resistance R12 to R15, R22 to R25 Ladder resistance R16, R26 Flow rate resistance Q1 Overcurrent protection transistor Q2 Electrolytic power ON / OFF transistor Q5 Control transistor

Claims (1)

[Claims] 1. A constant voltage circuit that stabilizes the rectified output of a diode bridge, and an electrolytic power source is changed by increasing / decreasing an n-stage ladder resistance connected to an output side voltage dividing resistor using the constant voltage as an input and a flow signal value. A variable voltage regulator circuit that outputs, a voltage conversion circuit that detects the current of the diode bridge and converts it into a voltage value, and an overcurrent detection circuit that detects the source resistance terminal voltage of the MOS transistor for ON / OFF of the electrolytic cell power supply. Set by the increase / decrease of the n-stage ladder resistance and the flow rate signal value that are interlocked with the electrolytic voltage value of the voltage variable regulator circuit, with either the detection voltage of the overcurrent detection circuit or the output voltage of the voltage conversion circuit as an input. And an overcurrent comparator that outputs an overcurrent signal for outputting an electrolysis stop signal by comparison with an overcurrent threshold. Electrolytic power supply circuit in water generator.