JP4785728B2 - Ion generator - Google Patents

Description

  The present invention relates to an ion generating apparatus including an ion generating element that generates positive ions and negative ions for sterilizing and removing airborne bacteria in air and removing harmful substances in air by discharging a discharge electrode. is there.

  Conventionally, ion generators using ion generating elements that generate positive ions and negative ions by applying corona discharge have been proposed, and are incorporated into air conditioners and air purifiers as one of the air purification technologies. It has become. These ion generators are classified into two types: an input power supply type using an AC commercial power supply and a type using a relatively low voltage DC power supply. The ion generator according to the present invention belongs to the type using a DC power source.

Here, as an example of a conventional ion generator using a DC power supply, Patent Document 1 discloses an ion generator as shown in FIG. 8 in which a discharge cycle is defined by a CR time constant.
In this ion generator, the capacitor 9 is charged from the DC power source through the limiting resistor 8, and the shunt regulator 21 is turned on when the divided voltage value of the charging voltage by the voltage dividing resistors 23, 24 and 25 reaches the reference voltage. This turns on the transistor 22. When the transistor 22 is turned on, charging of the other capacitor 26 is started. When the charging voltage of the capacitor 26 reaches the trigger voltage, the switching element 30 is turned on, and discharging from the capacitor 9 is started. The current flows through the primary side coil of the step-up transformer 2 to the ground terminal.

When the divided voltage value of the charging voltage of the capacitor 9 by the voltage dividing resistors 23, 24, and 25 drops below the reference voltage due to the discharge from the capacitor 9, the shunt regulator 21 is turned off, thereby turning off the transistor 22. .
When the transistor 22 is turned off, discharging from the capacitor 26 is started, the charging voltage of the capacitor 26 falls below the trigger voltage, and the switching element 30 is turned off by the charge of the capacitor 9 flowing out. The discharge current from the capacitor 9 flowing through the primary coil is interrupted, and charging to the capacitor 9 is resumed.

When the charging of the capacitor 9 is resumed and the divided voltage value of the charging voltage by the voltage dividing resistors 23, 24, and 25 reaches the reference voltage, the shunt regulator 21 is turned on and the transistor 22 is turned on.
By repeating the above operation, the charging voltage of the capacitor 9 is boosted by the step-up transformer 2 and when the boosted voltage exceeds the discharge voltage, the discharge electrode 1 connected to both ends of the secondary coil of the step-up transformer 2. Discharges and generates negative ions and positive ions.

In the DC power input type ion generator as described above, the switching element 30 is periodically turned on, and the secondary coil of the step-up transformer 2 generates a high voltage sufficient for the discharge electrode 1 to discharge. Therefore, as shown in FIG. 9, a circuit configuration that switches the step-up transformer 2 based on the output signal of the oscillation circuit 6 can be realized.
In the ion generator shown in FIG. 9, the DC power supply voltage Vcc stabilized by the smoothing capacitor 7 is applied to the oscillation circuit 6, and the oscillation circuit 6 outputs a periodic signal having a predetermined period and supplies it to the inverter 5. The periodic signal inverted by the inverter 5 is given to the gate of the switching element (field effect transistor) 3 through the gate resistor 4.

The switching element 3 is connected between one terminal of the primary side coil of the step-up transformer 2 and the ground terminal, and a DC power supply voltage Vcc is applied to the other terminal of the primary side coil. A flyback diode 10 for protecting the switching element 3 is connected between both terminals of the primary coil.
Both terminals of the secondary coil of the step-up transformer 2 are connected to the respective electrodes of the discharge electrode 1 having two electrodes.

Hereinafter, the operation of the ion generator having such a configuration will be described with reference to the timing chart of FIG.
When the oscillation circuit 6 outputs a periodic signal that temporarily changes from the substantially DC power supply voltage Vcc to the ground potential (node A in FIG. 10A), switching with the gate resistor 4 is performed based on the periodic signal inverted by the inverter 5. A voltage ((b) node B) according to the time constant with the gate input capacitance of the element 3 is applied to the gate of the switching element 3. As a result, the switching element 3 is turned on, a current flows through the primary coil of the step-up transformer 2, and the voltage on the other terminal side of the primary coil temporarily drops to the ground potential ((c)). Node C).

  When a current temporarily flows through the primary side coil of the step-up transformer 2 and is interrupted, an AC voltage ((d) boosted according to the turn ratio of the primary side coil and the secondary side coil due to the change in the current. ) When the node D) is induced in the secondary coil and the induced voltage exceeds the discharge voltage (± HV), the discharge electrode 1 is discharged, and negative ions and positive ions are generated.

On the other hand, when the periodic signal increases by, for example, three times or more due to an abnormal operation due to the malfunction of the oscillation circuit 6, as shown in FIGS. The switching element 3 on the side is turned on, and the number of discharges increases three times or more.
JP 2005-332774 A

  The ion generator shown in FIG. 9 described above has the advantage that the discharge cycle for generating ions is very stable and has little variation, and the accuracy of the number of discharges, which is a guide when controlling the amount of ions generated, is high. . On the other hand, when the oscillation circuit and the switching element on the primary side of the step-up transformer are separated as described above, as described above, when the oscillation circuit fails and the oscillation frequency rises, the switching element is boosted by the periodic signal. Since the transformer is driven, the discharge is continued as it is even if the number of times of discharge becomes abnormal such as 5 times or 10 times.

For this reason, the number of discharges falls within the audible frequency range, and there is a problem that noise resulting from the discharge occurs. In addition, since the amount of ozone generated by discharge increases in proportion to the number of discharges, there is no effect when the space where the ion generator is used is large, but when it is used in a small space with a high degree of sealing. Causes a problem that the ozone odor becomes noticeable and uncomfortable.
The present invention has been made in view of the circumstances described above, and even when an oscillation circuit for obtaining a discharge voltage fails and an oscillation frequency rises, noise due to discharge is hardly generated, An object of the present invention is to provide an ion generator in which the amount of generated ozone is difficult to increase.

  An ion generator according to the present invention includes a capacitor to which a DC voltage is applied through a resistor, and an oscillation circuit that outputs a periodic signal for interrupting a discharge current from the capacitor, and uses the intermittent of the discharge current. In an ion generator configured to generate positive ions and negative ions or negative ions by discharging with a boosted voltage, the time constant of the circuit composed of the resistor and the capacitor is a cycle in which the oscillation circuit outputs It is set to 1/3 or more of the period of a signal.

  In this ion generator, a direct current voltage is applied to a capacitor through a resistor, and an oscillation circuit outputs a periodic signal for interrupting the discharge current from the capacitor, and discharges by a voltage boosted by using the intermittent discharge current. Thus, positive ions and negative ions or negative ions are generated. The time constant of the circuit composed of the resistor and the capacitor is set to 1/3 or more of the period of the periodic signal output from the oscillation circuit.

  An ion generator according to the present invention includes a capacitor to which a DC voltage is applied through a resistor, a series circuit connected in parallel to the capacitor, and a primary coil of a step-up transformer and a switching element connected in series, and the switching element Is connected between both terminals of the secondary coil of the step-up transformer, and outputs a periodic signal for turning on / off, and is discharged by a voltage greater than a predetermined value between the two terminals, plus ion and minus ion Alternatively, in an ion generator including a discharge electrode that generates negative ions, a time constant of a circuit including the resistor and the capacitor is set to be 1/3 or more of a period of a periodic signal output from the oscillation circuit. Features.

  In this ion generator, a DC voltage is applied to a capacitor through a resistor, and a series circuit in which a primary coil of a step-up transformer and a switching element are connected in series is connected in parallel to the capacitor. The oscillation circuit outputs a periodic signal for turning on / off the switching element, and the discharge electrode connected between both terminals of the secondary coil of the step-up transformer is discharged by a voltage higher than a predetermined value between both terminals. , Positive ions and negative ions or negative ions are generated. The time constant of the circuit composed of the resistor and the capacitor is set to 1/3 or more of the period of the periodic signal output from the oscillation circuit.

An ion generator according to the present invention includes a series circuit in which a primary coil of a step-up transformer and a field effect transistor are connected in series, and a DC voltage is applied, and a periodic signal that turns on and off the gate of the field effect transistor through a resistor. Is connected between both terminals of a secondary coil of the step-up transformer and discharges by generating a positive ion and a negative ion or a negative ion by discharging with a voltage higher than a predetermined value between the two terminals. In the ion generator including the electrode, a time constant of a circuit including the resistor and a gate input capacitance of the field effect transistor is shorter than a pulse width of a periodic signal output when the oscillation circuit operates normally , and noise and ozone JP but said oscillating circuit during abnormal operation that occurs is longer set on the pulse width or more of the periodic signal to be output To.

In this ion generator, a DC voltage is applied to a series circuit in which a primary coil of a step-up transformer and a field effect transistor are connected in series, and a periodic signal for turning on / off the gate of the field effect transistor through a resistor is generated as an oscillation circuit. Is output. A discharge electrode connected between both terminals of the secondary coil of the step-up transformer is discharged by a voltage higher than a predetermined value between the two terminals to generate positive ions and negative ions or negative ions. The time constant of the circuit composed of the resistor and the gate input capacitance of the field effect transistor is shorter than the pulse width of the periodic signal output during normal operation of the oscillation circuit, and the oscillation circuit outputs during abnormal operation where noise and ozone are generated. It is set longer on the pulse width or more of the periodic signal.

An ion generator according to the present invention includes a capacitor to which a DC voltage is applied through a first resistor, a series circuit connected in parallel to the capacitor, and a primary coil of a step-up transformer and a field effect transistor connected in series. An oscillation circuit that outputs a periodic signal for turning on / off the gate of the field effect transistor through a second resistor, and a voltage higher than a predetermined value between the two terminals of the secondary coil of the step-up transformer. In the ion generator having a positive electrode and a negative electrode or a discharge electrode for generating negative ions, the time constant of the circuit composed of the first resistor and the capacitor is the period of the periodic signal output by the oscillation circuit. And a circuit comprising the second resistor and the gate input capacitance of the field effect transistor Time constant, the oscillation circuit is set normally smaller than the pulse width of the periodic signal to be output during operation, and long on pulse width than the periodic signal noise and ozone is output from the oscillation circuit when the abnormal operation that occurs It is characterized by that.

In this ion generator, a DC voltage is applied to a capacitor through a first resistor, and a series circuit in which a primary coil of a step-up transformer and a field effect transistor are connected in series is connected in parallel to the capacitor. The oscillation circuit outputs a periodic signal for turning on / off the gate of the field effect transistor through the second resistor, and the discharge electrode connected between the terminals of the secondary coil of the step-up transformer is equal to or greater than a predetermined value between the terminals. To generate positive ions and negative ions or negative ions. The time constant of the circuit composed of the first resistor and the capacitor is set to 1/3 or more of the period of the periodic signal output from the oscillation circuit, and the circuit is composed of the second resistor and the gate input capacitance of the field effect transistor. constant, the oscillation circuit is set normally smaller than the pulse width of the periodic signal to be output during operation and during abnormal operation noise and ozone is generated a long on pulse width than the periodic signal oscillating circuit outputs.

  According to the ion generator of the present invention, even when the oscillation circuit for obtaining the discharge voltage fails and the oscillation frequency rises, noise caused by the discharge is generated by stopping the discharge or weakening the discharge. It is difficult to realize an ion generating device that is difficult to increase in ozone generation amount and is difficult to increase unpleasant odor.

Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of Embodiment 1 of an ion generator according to the present invention.
In this ion generator, the DC power supply voltage Vcc stabilized by the smoothing capacitor 7 is supplied to the oscillation circuit 6, and the oscillation circuit 6 outputs a periodic signal having a predetermined period and supplies it to the inverter 5. The periodic signal inverted by the inverter 5 is given to the gate of the switching element (field effect transistor) 3.

The switching element 3 is connected between one terminal of the primary coil of the step-up transformer 2 and the ground terminal, and the other terminal of the primary coil is supplied with the DC power supply voltage Vcc through the resistor 8. A capacitor 9 is connected between the other terminal of the primary coil and the ground terminal. The time constant of the circuit including the resistor 8 and the capacitor 9 is set to 1/3 or more of the period of the periodic signal output from the oscillation circuit 6.
Both terminals of the secondary coil of the step-up transformer 2 are connected to the respective electrodes of the discharge electrode 1 having two electrodes.

Hereinafter, the operation of the ion generator having such a configuration will be described with reference to the timing charts of FIGS.
When a power switch (not shown) is turned on, the capacitor 9 is fully charged according to the time constant of the circuit composed of the resistor 8 and the capacitor 9 through the resistor 8 by the DC power supply voltage Vcc until the voltage at both ends becomes substantially the DC power supply voltage Vcc. (FIG. 2 (c), node C).

  After the capacitor 9 is fully charged, when the oscillation circuit 6 outputs a periodic signal that temporarily changes from approximately the DC power supply voltage Vcc to the ground potential (node A in FIG. 2A), the period inverted by the inverter 5 Based on the signal, a voltage ((b) node B) according to the time constant of the gate input capacitance of the switching element 3 is applied to the gate of the switching element 3. As a result, the switching element 3 is turned on, the discharge current from the capacitor 9 flows to the primary side coil of the step-up transformer 2, and the voltage on the other terminal side of the primary side coil temporarily drops to the ground potential. ((C) node C).

  When a current temporarily flows through the primary side coil of the step-up transformer 2 (b), an alternating voltage ((d) boosted according to the turn ratio of the primary side coil and the secondary side coil due to the change in the current. When the node D) is induced in the secondary coil and the induced voltage exceeds the discharge voltage (± HV), the discharge electrode 1 is discharged, and negative ions and positive ions are generated.

When the current of the primary side coil of the step-up transformer 2 is interrupted (b), the capacitor 9 is fully charged until the voltage at both ends becomes substantially the DC power supply voltage Vcc ((c) node C). After the capacitor 9 is fully charged, the oscillation circuit 6 again outputs a periodic signal that temporarily changes from the substantially DC power supply voltage Vcc to the ground potential (node A in FIG. 2 (a)).
By repeating the above operation, a sufficiently high impulse voltage for discharging is applied to the discharge electrode 1 connected to the secondary coil of the step-up transformer 2 ((d) node D), minus Ions and positive ions can be generated.

On the other hand, when it is assumed that the periodic signal has increased by, for example, three times or more due to an abnormal operation due to a defect such as a solder failure or component failure of the oscillation circuit 6 (FIG. 3A), the switching element 3 It is turned on / off in synchronization with the periodic signal ((b) node B). For this reason, the charging period of the capacitor 9 becomes 1/3 or less, and the charging voltage of the capacitor 9 remains at about 60% of the normal operation due to the time constant of the resistor 8 and the capacitor 9 ((c) node C). Accordingly, the voltage induced in the secondary coil of the step-up transformer 2 is also reduced, and the discharge electrode 1 is only applied with a voltage equal to or lower than the discharge voltage ((d) node D), so that discharge becomes impossible and no noise is generated. Also, ozone is not generated.
In addition, even if the voltage induced in the secondary coil of the step-up transformer 2 is insufficient and the discharge electrode 1 is applied with a voltage exceeding the discharge voltage ((d) node D), the discharge is weak. The generated noise is small and the amount of ozone generated is small.

(Embodiment 2)
FIG. 4 is a block diagram showing the configuration of Embodiment 2 of the ion generator according to the present invention.
In this ion generator, the DC power supply voltage Vcc stabilized by the smoothing capacitor 7 is supplied to the oscillation circuit 6, and the oscillation circuit 6 outputs a periodic signal having a predetermined period and supplies it to the inverter 5. The periodic signal inverted by the inverter 5 is given to the gate of the switching element (field effect transistor) 3 through the gate resistor 4. The time constant of the circuit composed of the gate resistor 4 and the gate input capacitance of the switching element 3 is set shorter than the pulse width of the periodic signal output from the oscillation circuit 6 during normal operation and longer than the pulse width during abnormal operation. ing.

The predetermined period is determined to be a period in which the influence of noise and ozone generation increases when the number of discharges further increases within the period of the periodic signal that the oscillation circuit 6 may output in the event of a failure. .
The oscillation circuit 6 is a timer IC, and an output signal cycle and a pulse width can be arbitrarily set by an external capacitor and an external resistor (not shown). For example, when an external capacitor is poorly connected, the frequency of the output signal increases several times, but the pulse width of the output signal is several microseconds, which is smaller than that during normal operation.

The switching element 3 is connected between one terminal of the primary side coil of the step-up transformer 2 and the ground terminal, and a DC power supply voltage Vcc is applied to the other terminal of the primary side coil.
Both terminals of the secondary coil of the step-up transformer 2 are connected to the respective electrodes of the discharge electrode 1 having two electrodes.

Hereinafter, the operation of the ion generator having such a configuration will be described with reference to the timing charts of FIGS.
When the oscillation circuit 6 outputs a periodic signal that temporarily changes from the substantially DC power supply voltage Vcc to the ground potential (node A in FIG. 5A), switching with the gate resistor 4 based on the periodic signal inverted by the inverter 5 is performed. A voltage ((b) node B) according to the time constant of the circuit composed of the gate input capacitance of the element 3 is applied to the gate of the switching element 3. As a result, the switching element 3 is turned on, a current flows through the primary coil of the step-up transformer 2, and the voltage on the other terminal side of the primary coil temporarily drops to the ground potential ((c)). Node C).

  When a current temporarily flows through the primary side coil of the step-up transformer 2 (b), an alternating voltage ((d) boosted according to the turn ratio of the primary side coil and the secondary side coil due to the change in the current. When the node D) is induced in the secondary coil and the induced voltage exceeds the discharge voltage (± HV), the discharge electrode 1 is discharged, and negative ions and positive ions are generated.

Here, since the time constant of the circuit composed of the gate resistor 4 and the gate input capacitance of the switching element 3 is set to be shorter than the pulse width of the periodic signal output from the oscillation circuit 6 during normal operation, the switching element 3 It can operate according to the periodic signal output from the oscillation circuit 6.
By repeating the above operation, a sufficiently high impulse voltage for discharging is applied to the discharge electrode 1 connected to the secondary coil of the step-up transformer 2 ((d) node D), minus Ions and positive ions can be generated.

  On the other hand, when it is assumed that the periodic signal has increased three times or more due to an abnormal operation due to a defect such as a solder failure or component failure of the oscillation circuit 6 (FIG. 6A), the switching element 3 has a period of the oscillation circuit 6. It is turned on / off in synchronization with the signal ((b) node B). At this time, if the time constant of the circuit composed of the gate resistor 4 and the gate input capacitance of the switching element 3 is set to be longer than the pulse width of the periodic signal output from the oscillation circuit 6 during abnormal operation, the switching element 3 In this case, the gate voltage cannot be sufficiently increased, and the on-current is reduced.

  Actually, since the output pulse width from the oscillation circuit 6 becomes small during abnormal operation (node A in FIG. 6A), a sufficiently large gate resistance (for example, 2 kΩ) and the gate input of the switching element (FET) Due to the time constant with the capacitance, the gate voltage does not rise completely, but falls below that during normal operation ((b) node B). Therefore, the on-current decreases ((c) node C), the terminal voltage of the secondary coil of the step-up transformer 2 decreases, and becomes lower than the discharge voltage (± HV) of the discharge electrode 1 ((d) Since the node D) cannot be discharged, no noise is generated and ozone is not generated.

  Since the gate voltage of the switching element 3 is specific to the FET to be used, the value of the gate resistance 4 may be determined in consideration of the characteristics of the element to be used. In addition, since it is necessary to operate properly during normal operation, if the value of the gate resistance 4 cannot be set excessively large, the terminal voltage of the secondary coil of the step-up transformer 2 is set so as to decrease to near the discharge voltage. As a result, the discharge of the discharge electrode 1 can be weakened, the generated noise is reduced, and the amount of ozone generated is reduced.

(Embodiment 3)
FIG. 7 is a block diagram showing a configuration of Embodiment 3 of the ion generator according to the present invention.
This ion generator is a combination of the ion generators shown in FIGS. 1 and 4, and the DC power supply voltage Vcc stabilized by the smoothing capacitor 7 is applied to the oscillation circuit 6, and the oscillation circuit 6 is defined. A periodic signal having the specified period is output and supplied to the inverter 5. The periodic signal inverted by the inverter 5 is given to the gate of the switching element (field effect transistor) 3 through the gate resistor 4. The time constant of the circuit composed of the gate resistor 4 and the gate input capacitance of the switching element 3 is set shorter than the pulse width of the periodic signal output from the oscillation circuit 6 during normal operation and longer than the pulse width during abnormal operation. Yes.

The predetermined period is determined to be a period in which the influence of noise and ozone generation increases when the number of discharges further increases within the period of the periodic signal that the oscillation circuit 6 may output in the event of a failure. .
The oscillation circuit 6 is a timer IC, and an output signal cycle and a pulse width can be arbitrarily set by an external capacitor and an external resistor (not shown). For example, when an external capacitor is poorly connected, the frequency of the output signal increases several times, but the pulse width of the output signal is a few microseconds, which is smaller than in normal operation.

The switching element 3 is connected between one terminal of the primary side coil of the step-up transformer 2 and the ground terminal, and a DC power supply voltage Vcc is applied to the other terminal of the primary side coil through the resistor 8. A capacitor 9 is connected between the other terminal of the primary coil and the ground terminal. The time constant of the circuit including the resistor 8 and the capacitor 9 is set to 1/3 or more of the period of the periodic signal output from the oscillation circuit 6.
Both terminals of the secondary coil of the step-up transformer 2 are connected to the respective electrodes of the discharge electrode 1 having two electrodes.

Since the operation of the ion generator having such a configuration is the same as that of the operations of the ion generators shown in FIGS. 1 and 4 described above, description thereof will be omitted.
In this ion generator, in each of the ion generators shown in FIGS. 1 and 4, when the terminal voltage of the secondary coil of the step-up transformer 2 cannot be sufficiently lowered during an abnormality, the respective configurations are combined. Thus, the terminal voltage of the secondary coil can be lowered to a voltage at which the discharge electrode 1 does not discharge.

It is a block diagram which shows the structure of embodiment of the ion generator which concerns on this invention. It is a timing chart which shows the example of operation | movement of the ion generator shown in FIG. It is a timing chart which shows the example of operation | movement at the time of abnormality of the ion generator shown in FIG. It is a block diagram which shows the structure of embodiment of the ion generator which concerns on this invention. It is a timing chart which shows the example of operation | movement of the ion generator shown in FIG. 5 is a timing chart showing an example of operation when the ion generator shown in FIG. 4 is abnormal. It is a block diagram which shows the structure of embodiment of the ion generator which concerns on this invention. It is a block diagram which shows the structural example of the conventional ion generator. It is a block diagram which shows the structural example of the conventional ion generator. It is a timing chart which shows the example of operation | movement of the ion generator shown in FIG. FIG. 10 is a timing chart showing an example of operation when the ion generator shown in FIG. 9 is abnormal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Discharge electrode 2 Boost transformer 3 Switching element 4 Gate resistance 5 Inverter 6 Oscillation circuit 7 Smoothing capacitor 8 Resistance 9 Capacitor

Claims (4)

A capacitor to which a DC voltage is applied through a resistor and an oscillation circuit that outputs a periodic signal for interrupting the discharge current from the capacitor are discharged by a voltage boosted using the intermittent of the discharge current, In an ion generator configured to generate positive ions and negative ions or negative ions,
An ion generator, wherein a time constant of a circuit comprising the resistor and the capacitor is set to 1/3 or more of a period of a periodic signal output from the oscillation circuit. A capacitor to which a DC voltage is applied through a resistor, a series circuit connected in parallel to the capacitor, the primary side coil of the step-up transformer and the switching element connected in series, and a periodic signal for turning on / off the switching element are output. And a discharge electrode that is connected between both terminals of the secondary coil of the step-up transformer and generates positive ions and negative ions or negative ions by discharging with a voltage greater than a predetermined value between the two terminals. In an ion generator comprising:
An ion generator, wherein a time constant of a circuit comprising the resistor and the capacitor is set to 1/3 or more of a period of a periodic signal output from the oscillation circuit. A series circuit in which a primary coil of a step-up transformer and a field effect transistor are connected in series and a DC voltage is applied; an oscillation circuit that outputs a periodic signal for turning on / off the gate of the field effect transistor through a resistor; In an ion generator, which is connected between both terminals of a secondary coil of a transformer and includes a discharge electrode that generates a positive ion and a negative ion or a negative ion by discharging with a voltage greater than a predetermined value between the two terminals.
A time constant of a circuit composed of the resistor and a gate input capacitance of the field effect transistor is shorter than a pulse width of a periodic signal output when the oscillation circuit operates normally , and the oscillation circuit operates during an abnormal operation where noise and ozone are generated. ion generating apparatus characterized by There has long been set on the pulse width or more of the output periodic signal. A capacitor to which a DC voltage is applied through a first resistor, a series circuit connected in parallel to the capacitor, a primary coil of a step-up transformer and a field effect transistor connected in series, and a gate of the field effect transistor connected to a second Connected between both terminals of an oscillation circuit that outputs a periodic signal that is turned on / off through a resistor and the secondary coil of the step-up transformer, and discharged by a voltage that is a predetermined value or more across the two terminals, plus ion and minus In an ion generator comprising a discharge electrode for generating ions or negative ions,
The time constant of the circuit composed of the first resistor and the capacitor is set to 1/3 or more of the period of the periodic signal output from the oscillation circuit, and from the second resistor and the gate input capacitance of the field effect transistor. the time constant of the composed circuit is shorter than the pulse width of the periodic signal the oscillation circuit is output during normal operation, and set longer on the pulse width or more of the periodic signal noise and ozone is the output oscillation circuit during abnormal operation that occurs Ion generator characterized by being made.

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