JPH076857A - Ozone generator - Google Patents

Abstract

PURPOSE:To stabilize an ozone generating quantity of an ozone generator by arranging an amplitude restricting means to restrict voltage amplitude of commercial electric power supply, and making voltage impressed on a high voltage generator constant to a change in electric power supply voltage. CONSTITUTION:Sine wave voltage of a plus half period of commercial electric power supply is impressed on terminals 2 and 3 of an amplitude restricting means 10, and when the voltage is increased and voltage between terminals 18a and 18c of a three- terminal constant voltage element 18 exceeds a prescribed value, constant voltage is generated between terminals 18b and 18c. When the voltage between the terminals 18b and 18c of the element 18 becomes constant voltage, an electric current of resistors 14 and 15 and a volume 16 becomes equal to an electric current of a resistor 17, and voltage between terminals 4 and 5 becomes constant, and the voltage of the plus half period of the commercial electric power supply is restricted in amplitude. Since a high voltage generator 30 is driven by this voltage, even if the voltage of the electric power supply is changed, amplitude of high frequency/high voltage generated in a secondary side coil 34B of a high frequency transformer 14 becomes also a constant value. Thereby, an ozone quantity generated by a corona discharger 45 becomes constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone generator for generating ozone by corona discharge, and particularly to an ozone generator for limiting the amount of ozone generated to a predetermined amount by limiting the voltage amplitude even if the commercial power source fluctuates. Regarding

[0002]

2. Description of the Related Art FIG. 5 shows a conventional ozone generator. In FIG. 5, the ozone generator 50 is a high voltage generator 30.
And a corona discharger 45. Between the input terminals 6-7 of the high voltage generator 30, a commercial power supply (nominal voltage 100
Vrms, frequency 50 Hz or 60 Hz) is applied. For the plus (+) half cycle of the sine wave voltage of the commercial power supply, the terminal 6-resistor r1-diode (D3) 32-capacitor (C1) 33-high-frequency transformer (T) 34 primary coil (L1) 34A- A current flows through the path from the diode (D4) 35 to the terminal 7, and the capacitor (C1) 33 stores the charge (Qo1) corresponding to the current and the half cycle time.

On the other hand, for a minus (-) half cycle of the sine wave voltage of the commercial power source, a terminal 7-resistor (r2) 37-resistor (r3) 38 and capacitor (C2) 39 in parallel circuit-
A current flows through the path of the diode (D5) 40-resistor (r1) 31-terminal 6, and the resistor (r3) 38 and the capacitor (C
2) The voltage across the parallel circuit of 39 (DC voltage smoothed by the capacitor C2) gradually increases, and the thyristor (SC
When the gate voltage of (R) 36 reaches the trigger voltage, the thyristor (SCR) 36 is turned on.

When the thyristor (SCR) 36 is turned on,
Electric charge (Qo1) stored in the capacitor (C1) 33
Is discharged in the path of the primary coil (L1) 34A of the thyristor (SCR) 36-transformer (T) 34, and the charge (Qo2) is stored in the capacitor (C1) 33 as the charge (Qo1).
It is charged with the opposite polarity. Next, the capacitor (C
1) The electric charge (Qo2) charged in the reverse polarity in 33 is discharged through the path of the primary coil (L1) 34A-diode (D5) 40-diode (D3) 32.

By repeating these charging / discharging operations, all the electric charge of the capacitor (C1) 33 is discharged. At this time, the secondary coil (L2) 34B of the high frequency transformer (T) 34 has a primary coil ( The high frequency voltage determined by the inductance of L1) 34A and the capacitance of capacitor (C1) 33 is applied to the winding ratio (N2 / N) of coil (L2) and coil (L1).
A high-frequency / high-voltage power source boosted in 1) is generated.

Driven by this high-frequency / high-voltage power source, ozone is generated by corona discharge from the corona discharger 45. The amount of ozone generated by the corona discharger 45 corresponds to the amount of electric charge charged in the capacitor (C1) 33, and this amount of electric charge is the voltage of the commercial power source applied between the terminals 6-7 of the high voltage generator 30. Corresponds to the value.

[0007]

The conventional ozone generator has a simple structure because it is directly driven by a commercial power source.
The amount of ozone generated is the voltage value of the commercial power supply (nominal 100 Vrm
Since it is determined in s), there is a problem that the amount of ozone generated changes due to the fluctuation of the voltage of the commercial power source.

The frequency of the commercial power source (50 Hz / 60
There is a problem that the amount of ozone generated changes with the difference in (Hz).

FIG. 6 is a circuit diagram of a conventional commercial power supply voltage amplitude limiting circuit. In the figure, the plus (+) of the commercial power source applied between the input terminals 61 and 62 of the amplitude limiting circuit 60.
The voltage of the half cycle is the voltage (about 0.6V) between the Zener diode (ZDo) 64, the base-emitter voltage of the transistor (Qo) 65 and the diode (Do) 66 via the resistor (Ro) 63. The amplitude is limited to the voltage value determined by 6 V), and the voltage is output between the terminals 67 and 68.

Since the output voltage between the terminals 67 and 68 is limited in voltage amplitude to a constant value, by driving the ozone generator 50 shown in FIG. 5 with this voltage output, even if the voltage of the commercial power supply fluctuates. Although the ozone generation amount can be kept almost constant, the amplitude limiting circuit 60 has the input terminal 6
When the voltage between 1-62 increases, there is a problem that the current increases and the power consumption of the resistor (Ro) 63 and the transistor (Qo) 65 increases.

The present invention has been made to solve the above problems, and stabilizes the ozone generation amount against the voltage fluctuation and the frequency change of the commercial power source, and the ozone generation is provided with the amplitude limiting means which consumes less power. The purpose is to provide a device.

[0012]

In order to solve the above-mentioned problems, an ozone generator according to the present invention comprises an amplitude limiting means for limiting the voltage amplitude of a commercial power source for driving a high voltage generator, and the ozone of a corona discharger is provided. It is characterized in that the generated amount is limited to a predetermined amount.

Further, the amplitude limiting means of the ozone generator according to the present invention is characterized by including an amplitude adjusting section for adjusting the voltage amplitude of the commercial power source to an arbitrary value.

Further, the amplitude limiting means of the ozone generator according to the present invention is characterized by including a frequency adjusting section for adjusting the voltage amplitude in response to the change of the frequency of the commercial power source.

[0015]

The ozone generator according to the present invention is provided with the amplitude limiting means for limiting the voltage amplitude of the commercial power source and can be set to an arbitrary amplitude value by the amplitude adjusting section. Therefore, the ozone generation amount can be adjusted to a predetermined value. You can

Also, the ozone generator according to the present invention is
Frequency of commercial power source (50Hz / 60
Even if (Hz) is changed, it can be limited to the voltage amplitude corresponding to the frequency, so that the ozone generation amount can be kept at a desired value.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall circuit diagram of an ozone generator according to the present invention. In FIG. 1, the ozone generator 1 is
The amplitude limiting means 10, the high voltage generator 30, and the corona discharger 45 are included. Since the high voltage generator 30 and the corona discharger 45 have the same configurations and operations as those described with reference to FIG. 5, their description will be omitted and only the amplitude limiting means 10 will be described.

In FIG. 1, the amplitude limiting means 10 includes a transistor (Q1) 11 whose collector and emitter are connected between a terminal 2 and a terminal 4, and this transistor (Q1).
1) The resistance (R
1) A transistor (Q2) 1 whose collector and emitter are respectively connected between 12 and a terminal-18a of a base-3 terminal constant voltage element (Vo) 18 of the transistor (Q1) 11
3 and a resistor (R2) connected between the emitter of the transistor (Q1) 11 and the base of the transistor (Q2) 13.
14, a resistor (R3) 15 and a volume (Rv) 16 connected in series between the base-3 terminal constant voltage element (Vo) 18 terminal 18b of the transistor (Q2) 13, and 3
It is composed of a resistor (R4) 17 connected between terminals 18b-18c of the terminal constant voltage element (Vo) 18.

The diode (D2) 20 connected between the terminals 2 and 4 connects the transistor (Q1) 11 from the minus (-) half cycle of the sine wave voltage of the commercial power source printed between the terminals 2 and 3. It is for bypassing for protection. In addition, terminal 3-3 terminal constant voltage element (Vo)
Diode (D1) 19 connected between terminals 18c of 18
Is provided to protect the amplitude limiting means 10 from the minus (-) half cycle of the sine wave voltage of the commercial power source printed between the terminals 2 and 3.

The three-terminal constant voltage element (Vo) 18 is an element that generates a constant voltage between the terminals 18b and 18c when a voltage exceeding a predetermined value is applied between the terminals 18a and 18c.

When a plus (+) half cycle sine wave voltage of the commercial power source is printed between the terminals 2-3 of the amplitude limiting means 10,
Terminal 2-Resistor (R1) 12-Transistor (Q1) 11
Base-emitter-resistance (R2) 14-resistance (R
3) 15-Volume (Rv) 16-Resistance (R4) 17
-Diode (D1) 19-Current flows in the path of terminal 3, and as the voltage of the commercial power supply increases, current also flows between the collector and emitter of the transistor (Q1) 11, the voltage of terminal 4 also rises, and the resistance increases. A current also flows through the path of the base-emitter of the transistor (Q2) 13, the terminal 18a-18c of the constant voltage element (Vo) 18, the diode (D1) 19 and the terminal 3 via the (R2) 14. When the voltage between the terminals 18a-18c of the terminal constant voltage element (Vo) 18 exceeds a predetermined value, a constant voltage is maintained between the terminals 18b-18c.

Terminal 18 of 3-terminal constant voltage device (Vo) 18
When a constant voltage is applied between b-18c, a constant current flows through the resistor (R4) 17, and the base current of the transistor (Q2) 13 and the current from the terminal 18b of the three-terminal constant voltage element (Vo) 18 are applied to the resistor (R4). ) 17, the currents of the resistors (R2) 14, (R3) 15, and the volume (Rv) 16 become equal to the current of the resistor (R4) 17, and the terminal 4− The voltage between the terminals 5 is constant, and the amplitude of the positive (+) half cycle sine wave voltage of the commercial power source is limited.

High voltage generator 30 with voltage limited amplitude
Drive, the amount of electric charge charged in the capacitor (C1) 33 becomes constant even if the voltage of the commercial power supply fluctuates,
Secondary coil (L2) 34 of high frequency transformer (T) 34
Since the power supply amplitude of the high frequency / high voltage generated in B also has a constant value, the amount of ozone generated from the corona discharger 45 by the corona discharge can be kept constant.

Further, the volume (R
v) The ozone generation amount can be adjusted by changing the resistance value of 16 and setting the voltage between the terminals 4 and 5 to another value.

Further, when the voltage of the commercial power source rises, the amplitude limiting means 10 also tries to increase the output voltage of the terminal 4, but this voltage increase is transmitted through the resistor (R2) 14 to the base of the transistor (Q2) 13. In addition, since the collector current is increased and the base current of the transistor (Q1) is absorbed, an increase in the output voltage is suppressed.

Since the emitter current of the transistor (Q1) is not increased even if the voltage of the commercial power source is increased, the power consumption of the ozone generator 1 can be reduced.

FIG. 2 is a characteristic diagram of the input voltage and the output voltage of the amplitude limiting means. In FIG. 2, terminal 2 of the amplitude limiting means
-The voltage waveform of the commercial power supply applied between terminals 3 is amplitude limited (constant voltage) at point A, and Vou is applied between terminals 4 and 5.
t is output. This amplitude limitation continues until point B, and thereafter, the output between terminals 4 and 5 also has a voltage waveform similar to the input voltage waveform between terminals 2-3. The point C indicates the voltage at which the thyristor (SCR) 36 in FIG. 1 is turned on.
FIG. 3 is a circuit diagram of another embodiment of the amplitude limiting means of the ozone generator according to the present invention. In FIG. 3, the frequency adjustment unit 2
1, a resistor (Ra) 22 and a resistor (Rb) 23 are provided.

When the frequency of the commercial power source applied between the terminals 2 and 3 is changed from 50 Hz to 60 Hz, the frequency adjustment unit 21 switches the resistance to change the amount of ozone generated from the corona discharger 45 of FIG. Set the same.

FIG. 4 is a circuit diagram of a second alternative embodiment of the amplitude limiting means. A Zener diode (ZD) 26 is used in place of the three-terminal constant voltage element (Vo) 18 shown in FIG.
3) The difference is that 15 is deleted. In addition, the diode (D
6) 27 is an example used for temperature compensation between the base and emitter of the transistor (Q2).

[0030]

As described above, the ozone generator according to the present invention is provided with the amplitude limiting means for arbitrarily limiting the voltage amplitude of the commercial power source. Therefore, even if the voltage of the commercial power source fluctuates, a high voltage generator is provided. Since the power supply voltage applied to the can be kept at a constant value, the ozone generation amount can be kept constant.

Further, the ozone generator according to the present invention is
Since the frequency adjusting unit is provided in the amplitude limiting means, the ozone generation amount can be kept constant even if the frequency of the commercial power source is changed.

Further, since the amplitude limiting means that the current increase is small even if the voltage of the commercial power source is increased, the ozone generator with low power consumption can be realized.

Therefore, it is possible to provide an ozone generator having a stable ozone generation amount.

[Brief description of drawings]

FIG. 1 is an overall circuit diagram of an ozone generator according to the present invention.

FIG. 2 is a characteristic diagram of input voltage and output voltage of the amplitude limiting means.

FIG. 3 is a circuit diagram of another embodiment of the amplitude limiting means of the ozone generator according to the present invention.

FIG. 4 is a circuit diagram of a second alternative embodiment of the amplitude limiting means.

FIG. 5: Conventional ozone generator

FIG. 6 is a circuit diagram of a conventional commercial power supply voltage amplitude limiting circuit.

[Explanation of symbols]

1 Ozone Generator 2, 3, 4, 5, 6, 7 Terminals 10, 21, 25 Amplitude Limiting Means 11, 13 Transistors (Q1, Q2) 12, 14, 15, 17, 22, 23 Resistances (R1, R
2, R3, R4, Ra, Rb) 16 volume (Rv) 18 3 terminal constant voltage element (Vo) 19, 20 diode (D1, D2, D6) 21 frequency adjuster 30 high voltage generator 45 corona discharger

Claims (3)

[Claims] 1. An ozone generator comprising a corona discharger that generates ozone by corona discharge and a high voltage generator that is driven by a commercial power source and applies a high frequency high voltage to the corona discharger. An ozone generator comprising an amplitude limiting means for limiting a voltage amplitude of the commercial power source for driving a generator, and limiting an ozone generation amount of the corona discharger to a predetermined amount. 2. The ozone generator according to claim 1, wherein the amplitude limiting unit includes an amplitude adjusting unit that adjusts the voltage amplitude of the commercial power source to an arbitrary value. 3. The ozone generator according to claim 1, wherein the amplitude limiting unit includes a frequency adjusting unit that adjusts the voltage amplitude in response to a change in the frequency of the commercial power source.