JP2007048632A - Ion generating device and air conditioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ion generating device capable of stable ion generation and adjustment of an ion generating volume. <P>SOLUTION: The ion generating device is provided with a fuse resistor 20 as a current detecting resistor for detecting charging current, and an operation amplifier 21 as a comparison circuit for comparing a both-end potential difference of the current detection resistor and a reference voltage, and controls the charging current to be a constant current based on comparison results by the operation amplifier 21. Further, by setting the resistor 20 and a resistor 29 in a proper way to change over a control terminal to an opening or a GND connection, change of the charging current is made possible, and so, as a result, is change of an ion generating volume. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ion generator and an air conditioner that are attached to an air conditioner such as an air conditioner, a dehumidifier, a humidifier, an air purifier, and a fan heater and generate ions in the air.

  In an enclosed space such as an office, conference room, or car, air pollutants exhausted by breathing, cigarette smoke, or dust increase air pollutants, so negative ions that have the effect of relaxing humans are air. Decrease from inside. Therefore, various ion generators have been proposed to replenish negative ions in the air, and this ion generator is mounted on an air purifier or the like.

  In addition, air purifiers that generate positive ions and negative ions, which have the effect of removing airborne bacteria in the air, have also been put to practical use. Air purifiers that can switch the effect of removing floating bacteria by the simultaneous generation of negative ions have also been put into practical use.

  As this type of prior art, for example, there is one disclosed in Patent Document 1. Hereinafter, the operation of the prior art will be described with reference to FIGS. The technique described below differs from the technique of Patent Document 1 in some respects. Specifically, the ion generator of Patent Document 1 describes a configuration as an AC input. The prior art described below is a DC input. This is convenient for explaining the difference from the present invention, and this conventional technique is also put into practical use. The capacitor C3 described in Patent Document 1 is for adjusting the balance between negative ions and positive ions. However, if it is not necessary to release a small amount of positive ions at the time of releasing negative ions, the capacitor C3 is not necessary, and the present invention. The description is omitted because it is considered unnecessary as an explanation of the prior art. The capacitor C3 may or may not be present.

  In an ion generator mounted on an air conditioner such as a conventional air purifier, a DC voltage of, for example, 12 V is applied between an input voltage terminal “+ V” and a ground terminal GND as shown in FIG. When the ON / OFF terminal, which is the start terminal, is connected to GND, the switch transistor 17 is turned on, the current flows through the switch transistor 17, and a voltage is applied to the input of the constant voltage regulator circuit 16 to stabilize it at 9V, for example. The output current flows through the current limiting resistor 1 and is charged into the charging capacitor 2.

  Here, the charging voltage of the charging capacitor 2 is divided by the resistor 5 and the resistor 6, and when the reference voltage of the shunt regulator 3 is reached, the shunt regulator 3 is turned on, the transistor 4 is turned on, and the resistance 8, a voltage is applied to the gate of the thyristor 11 and the thyristor 11 is turned on.

  At this time, in the loop of the charging capacitor 2, the primary winding 12 a of the step-up transformer 12 and the thyristor 11, the primary winding is discharged by discharging the charge charged in the charging capacitor 2 due to a short circuit of the thyristor 11. An impulse voltage is generated in 12a, a high voltage generated in the secondary winding 12b of the step-up transformer 12 is applied to the electrode of the ion generating element 13, and ions are discharged by discharge from the electrode by the applied voltage.

  On the other hand, when the operating voltage of the relay 14 is applied to the relay terminal RYON, the relay 14 operates, and one terminal of the secondary winding 12b of the step-up transformer 12 is connected to the ground terminal GND through the diode 15 and emits negative ions. .

  Further, when the relay 14 is open, positive ions and negative ions are released.

  The constant voltage regulator circuit 16 is provided when the input voltage is battery-driven, for example, for in-vehicle use and the input voltage is not stabilized, such as 10 V to 16 V, and may not be necessary depending on the application.

  The transistor 17 is used for ON / OFF of ion generation, and may not be necessary depending on the application, for example, when ON / OFF of the ion generator is controlled by controlling power supply to the ion generator.

  The operation of another prior art will be described below with reference to FIG.

  FIG. 7 shows an example in which a two-terminal thyristor 19 is used as a discharge switch element. When the charging voltage of the charging capacitor 2 reaches the breakover voltage of the two-terminal thyristor 19, the two-terminal thyristor 19 is short-circuited and ions are released. To do.

This operation is an example in which the gate ON of the thyristor 11 in FIG. 6 is substituted by the breakover of the two-terminal thyristor 19, and the basic operation is the same.
JP 2003-100419 A (published on April 4, 2003)

  However, in the above conventional ion generator, the voltage across the charging capacitor 2 draws a time constant curve by the resistor 1 and the charging capacitor 2 as shown in FIG. It is done at the point where it became loose. As a result, the discharge (ion generation) cycle is greatly affected by slight variations in the input voltage and the detection voltage, resulting in variations in the discharge cycle.

  Here, the variation in the discharge cycle affects the amount of ions generated and the amount of sound generated by the discharge, and is an inhibiting factor for stable ion generation.

  The present invention has been made in view of the above-described problems, and an object thereof is to realize an ion generator and an air conditioner that enable stable ion generation with little variation in the ion generation cycle. .

  In order to solve the above-described problems, an ion generator according to the present invention includes an ion generating element that generates ions by discharging, a charging circuit that charges a charging capacitor with a charging current, and the charging capacitor that is charged. A discharge switching element that discharges the charging capacitor when a charging voltage reaches a predetermined value, and a voltage application circuit that applies a voltage required for ion generation to the ion generating element by the discharge. In the ion generator, the charging circuit is configured to keep a current value of the charging current constant, and includes a charging current selection circuit that selects the constant current value of the charging current.

  With the above configuration, the current value of the charging current is kept constant. Therefore, there is an effect that stable ion generation is possible with little variation in the ion generation cycle.

  In addition, with the above configuration, a constant current value of the charging current can be selected. Therefore, there is an effect that the amount of generated ions can be controlled.

  In addition to the above configuration, the ion generating apparatus according to the present invention is characterized in that the discharge switch element is an element having a function of maintaining a short-circuit operation by a current flowing through the element after the start of the short-circuit operation. It is said.

  With the above configuration, the discharge switch element is an element having a function of maintaining a short-circuit operation by a current flowing through the element after the start of the short-circuit operation. Therefore, stable ion generation without malfunction is possible by setting a charging current less than the holding current. Therefore, in addition to the effect of the above-described configuration, the charging capacitor can be surely short-circuited and the reliability of ion generation is increased.

  In addition to the above-described configuration, the ion generator according to the present invention may be configured such that the charging circuit detects a voltage across a current detection resistor that is a resistor on a path for supplying the charging current, and the voltage is a reference. The charging current value is increased or decreased to match the voltage, and the charging current selection circuit includes at least one selection resistor having one end connected to one end of the current detection resistor, and the selection resistor. And a control terminal that is connected to the other end and can be switched to a constant potential.

  With the above configuration, the control terminal is switched between open and constant potential. Therefore, in addition to the effect by said structure, there exists an effect that control of the amount of ion generation is attained with a simple structure.

  In addition to the above configuration, the ion generating apparatus according to the present invention is characterized in that the control terminal can be switched between an open state and a GND level as the constant potential.

  With the above configuration, the control terminal is switched between the open state and the GND level. Therefore, in addition to the effect by said structure, there exists an effect that control of the amount of ion generation is attained with a simple structure.

  In addition to the above configuration, the ion generator according to the present invention is characterized in that the constant potential of the control terminal is a value that stops ion generation in the ion generating element.

  With the above configuration, the control terminal is switched to a value that stops the ion generation in the ion generating element. Therefore, in addition to the effect of the above configuration, in addition to the control of the ion generation amount with a simple configuration, there is an effect that ON / OFF control is also possible.

  In addition to the above-described configuration, the ion generator according to the present invention may be configured such that the charging circuit detects a voltage across a current detection resistor that is a resistor on a path for supplying the charging current, and the voltage is a reference. The charging current value is increased or decreased so as to match the voltage, and the reference voltage is supplied from the outside of the ion generator, and changing the voltage value changes the charging current to change the generated ions. It is characterized by that.

  With the above-described configuration, the reference voltage is supplied from the outside of the ion generator, and by changing the voltage value, the charging current changes and the generated ions change. Therefore, in addition to the effect by said structure, there exists an effect that control of the amount of ion generation is attained with a simple structure.

  In addition to the above configuration, the ion generator according to the present invention is characterized in that ion generation of the ion generator can be stopped by changing the reference voltage to zero or less.

  With the above configuration, the ion generation of the ion generator can be stopped by changing the reference voltage to zero or less. Therefore, in addition to the effect of the above configuration, in addition to the control of the ion generation amount with a simple configuration, there is an effect that ON / OFF control is also possible.

  An air conditioner according to the present invention includes any one of the above ion generators.

  With the above configuration, the current value of the charging current is kept constant. Therefore, there is an effect that stable ion generation is possible with little variation in the ion generation cycle.

  In addition, with the above configuration, a constant current value of the charging current can be selected. Therefore, there is an effect that the amount of generated ions can be controlled.

  As described above, in the ion generator according to the present invention, the charging circuit keeps the current value of the charging current constant, and the charging current selection circuit that selects the constant current value of the charging current. It is the structure provided with.

  Moreover, the air conditioning apparatus which concerns on this invention is the structure provided with one of the said ion generators.

  As a result, there is an effect that stable ion generation is possible with less variation in the ion generation cycle.

  This also has the effect that the amount of ion generation can be controlled.

  An embodiment of the present invention will be described as follows. For convenience of explanation, members having the same functions as those already described with reference to the drawings are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 1, elements indicated by 2, 20, 21, 23, 24, 26, and 28 constitute a charging circuit. In FIG. 1, elements indicated by 2 to 12 constitute a voltage application circuit.

  The fuse resistor (current detection resistor) 20 is for detecting a charging current. The fuse resistor 20 is a circuit formed by sequentially connecting the input voltage terminal “+ V”, the switching transistor 26, the charging capacitor 2, and the GND terminal in the charging circuit. 2, the transformer 12 and the thyristor 11 are connected in series with the charging capacitor 2 at a portion not on the circuit formed by connecting them in order. More specifically, the fuse resistor 20 is provided between the charging capacitor 2 and GND.

  The PNP type switching transistor 26 turns on and off the charging of the charging capacitor 2, the emitter is connected to the input positive side of the ion generator, the collector is connected to the charging capacitor 2, and the base is a resistor 25. To the collector of a PNP control transistor 24. The control transistor 24 has an emitter connected to GND and a base connected to the operational amplifier (comparison circuit) 21.

  The operational amplifier 21 compares the potential difference between both ends of the fuse resistor 20 as a current detection resistor for detecting the charging current with the reference voltage of the reference voltage element 23 and applies the comparison result to the base of the control transistor 24 to switch the switch. The transistor 26 is controlled to be turned on and off so that the charging current becomes a constant current. By making the charging current constant, variations in the ion generation cycle are reduced, and ion generation is not stopped due to malfunction due to noise, and stable ion generation is possible. The positive input terminal of the operational amplifier 21 is connected to the positive side of the reference voltage element 23 for supplying a reference voltage, while the negative input terminal of the operational amplifier 21 is connected to one end of the resistor 28, and the other end of the resistor is connected to the above-mentioned resistor. One end of the fuse resistor 20 is connected, and the other end of the fuse resistor 20 is connected to the negative side of the reference voltage element 23 and to GND.

  In FIG. 1, a resistor 20 is a charging current detection resistor, and one end of a resistor 29 (charging current selection circuit, selection resistor) is connected to the outside of the ion generator as a control terminal Control (charging current selection circuit). These functions will be described later.

[Stable ion generation]
In this embodiment, the voltage at the connection point between the resistor 20 and the resistor 29 and the reference voltage 23 are compared by the operational amplifier 21 and the transistor 24 and the transistor 26 are controlled so that the charging current to the capacitor 2 becomes a constant current, and the ion generation period is It is stable and the amount of ion generation is stabilized.

  That is, in FIG. 1, since no current flows through the fuse resistor 20 at startup, the negative input terminal of the operational amplifier 21 is at the GND level, and the reference voltage of the reference voltage element 23 connected to the positive input terminal of the operational amplifier 21 is From the comparison, the output of the operational amplifier 21 becomes high level. Therefore, the control transistor 24 is turned on, the switch transistor 26 is turned on, and charging of the charging capacitor 2 is started.

  At this time, the charging current to the charging capacitor 2 flows through the fuse resistor 20 and the negative input terminal of the operational amplifier 21 shifts in the positive direction. By controlling the transistor 26, the negative input terminal of the operational amplifier 21 is controlled to be the same as the reference voltage. Thus, since the control transistor 24 is controlled so that the negative input terminal of the operational amplifier 21 is equal to the reference voltage (the positive input terminal voltage of the operational amplifier), even if the voltage at the input voltage terminal “+ V” fluctuates. The charging current value is stabilized.

  This will be described in detail below.

  The positive input terminal of the operational amplifier 21 always has a reference voltage value due to the reference voltage element 23. On the other hand, since no current initially flows through the resistor 28 connected to the negative input terminal of the operational amplifier 21, the voltage at the negative input terminal of the operational amplifier 21 is low. Therefore, the voltage at the negative input terminal becomes lower than the voltage at the positive input terminal, and the output of the operational amplifier changes in the positive direction. This change results in an increase in the base current of the control transistor 24, the control transistor 24 shifts to the ON state, the base current of the switch transistor 26 flows, the switch transistor 26 shifts to the ON state, and the charging transistor The charging current to the capacitor 2 is increased.

  Since the increase in the charging current is an increase in the current flowing through the fuse resistor 20, the voltage across the fuse resistor 20 increases and the voltage at the negative input terminal of the operational amplifier 21 increases. When the voltage at the negative input terminal becomes higher than the voltage at the positive input terminal, the output of the operational amplifier changes in the negative direction. As a result, the base current of the control transistor 24 decreases, the control transistor 24 shifts to the OFF state, the base current of the switch transistor 26 decreases, and the switch transistor 26 shifts to the OFF state. The charging current to the capacitor 2 is reduced.

  Since the decrease in the charging current is a decrease in the current flowing through the fuse resistor 20, the voltage across the fuse resistor 20 decreases, the voltage at the negative input terminal of the operational amplifier 21 decreases, and as described above, the negative input terminal of the operational amplifier decreases. Since the voltage is lower than the voltage at the positive input terminal, the output of the operational amplifier changes in the positive direction, and the control transistor 24 shifts to the ON state and the switch transistor 26 shifts to the ON state. Increase.

That is, when the negative input terminal of the operational amplifier 21 is lower than the positive input terminal, the charging current increases. When the negative input terminal is higher than the positive input terminal, the charging current decreases, and the change in the charging current is caused by the negative input terminal of the operational amplifier 21. In order to control the charging current as a change, the negative input terminal of the operational amplifier 21 is balanced so as to be the same as the reference voltage. That is, the charging current of the charging capacitor 2 is controlled to a constant current. Thus, it can be seen that the charging current is controlled to be constant even when the voltage at the input voltage terminal “+ V” changes. That is, the charging current is expressed by the following equation.
Charging current = (reference voltage) / (resistance value of fuse resistor 20)
Note that the current at the input terminal of the operational amplifier 21 is within the error range and is not described in the equation. Since the right side of this equation is a constant value, it can be seen that the charging current is controlled by a constant current.

  Note that, here, “the negative input terminal of the operational amplifier 21 is the same as the reference voltage”, but conversely, the matters listed as problems to be solved by the present invention are practically problematic. This means that the charging current of the charging capacitor 2 should have a result of “constant current” so that the charging current of the charging capacitor 2 does not reach a certain level. Not (may be exactly the same). That is, it means that it is only necessary to be “identical enough to solve the problem”, and how close to the same can be arbitrarily determined at the time of designing the apparatus.

Note that the value of the reference voltage has the following relationship.
(Reference voltage) <(minimum value of voltage of input voltage terminal “+ V”) − (maximum charging voltage of charging capacitor 2) − (saturation voltage when switching transistor 26 is ON)
For example, when the input voltage requirement is 10V to 16V or the like due to in-vehicle battery driving or the like, the maximum charging voltage of the charging capacitor 2 (the voltage immediately before the thyristor 11 is turned on) is set to 8.5 V, for example, for switching If the saturation voltage of the transistor 26 is 0.3V,
10-8.5-0.3 = 1.2
Therefore, the reference voltage value is set to 1 V, for example.

  Further, as a protection when a large current flows through the ion generator due to a failure or the like, the resistance of the member number 20 is a fuse resistance. In normal operation, since the current flowing through the fuse resistor 20 is constant, it is easy to set the breaking current, which is useful as an overcurrent protection at the time of failure.

  The discharge switch element is composed of a thyristor 11, and after the gate trigger, the ON state is maintained by the discharge current (short-circuit current) of the charging capacitor 2 to completely discharge the charging capacitor 2.

  By appropriately adjusting the fuse resistor 20 and the like, the charging current is set to a value less than the holding current of the thyristor 11 that is the discharge switch element. As a result, even when the thyristor 11 is turned on due to external noise or the like when the charging capacitor 2 is not charged to some extent, the charging current to the charging capacitor 2 flows into the thyristor 11 even when the thyristor 11 is turned on. It is possible to avoid the problem that the ON state of 11 is sustained. Details are described below.

  In the conventional configuration shown in FIGS. 6 and 7, the operation of the thyristor 11 and the two-terminal thyristor 19 will be described in detail. After reaching the gate ON or breakover voltage, the thyristor 11 and the two-terminal which are discharge switch elements. The thyristor 19 is turned on, and the charge charged in the charging capacitor 2 is discharged. At this time, the current flowing as the discharge current satisfies the holding current of the thyristor 11 and the two-terminal thyristor 19 because the thyristor 11 and the two-terminal thyristor 19 are in a substantially short-circuited state (the holding current means that the discharge switch element is ON). Then, the charging capacitor 2 is completely discharged).

Here, with the counter electromotive force generated in the primary winding 12a of the transformer 12 connected in series, the charging capacitor 2 is charged to a voltage of, for example, 2V, contrary to the charging direction. This is necessary as an OFF operation of the thyristor 11 and the two-terminal thyristor 19 which are discharge switch elements, and as a result, is a current flowing through the resistor 1 immediately after the charging capacitor 2 is discharged (output of the constant voltage regulator circuit 16). Voltage) / resistance 1
Even if the current indicated by is greater than or equal to the holding current value, the discharge switch element is reliably turned off, and charging of the charging capacitor 2 in the next cycle can be started.

  On the other hand, the counter electromotive force of the transformer 12 does not occur when the discharge switch element is turned on due to external noise or the like even though the charging capacitor 2 has not been charged to some extent. As a result, there is a problem that the current for charging the charging capacitor 2 that flows through the resistor 1 continues to flow to the discharge switch element, and the discharge switch element is stabilized in the ON state, so that ion generation is stopped.

  As a solution to this problem, the resistance value of the resistor 1 may be set so that the value of the current flowing through the resistor 1 immediately after discharging of the charging capacitor 2 becomes smaller than the holding current value. The period of discharge becomes large, and the effect of ion generation is diminished.

  In particular, in the above conventional configuration, as shown in FIG. 8, the charging waveform of the charging capacitor 2 draws a curve corresponding to the time constant, and the value of the current flowing through the resistor 1 immediately after the charging capacitor 2 is discharged is within the operating period. Therefore, setting the current value flowing through the resistor 1 to be small at this time greatly affects the discharge cycle.

  As described above, in the conventional configuration, since the charging current is not a constant current, the charging waveform of the charging capacitor 2 is a convex curve, and the inclination is gentle. Therefore, it takes time to charge compared to the case of a straight line. Therefore, when the charging current value immediately after the discharging of the charging capacitor 2 is set smaller than the holding current value of the thyristor 11, the charging capacitor 2 has a corresponding amount of charge compared to the case where the charging waveform of the charging capacitor 2 is a straight line. The discharge cycle is greatly extended.

  However, in the present embodiment, as shown in FIG. 5, the charging waveform of the charging capacitor 2 is linear, so that charging is faster by that amount, and as a result, the charging current value immediately after discharging of the charging capacitor 2 is reduced. Even if it is set, the discharge cycle of the charging capacitor 2 does not need to be extended as much as in the case of FIG.

  Thus, the structure which concerns on this form can implement | achieve stable ion generation with few variations of ion generation.

[Regulation of ion generation amount]
Furthermore, in the configuration according to the present embodiment, an ion generator and an air conditioner that can control the amount of ions generated from the outside can be realized. This is described below.

  The voltage at the connection point between the resistor 20 and the resistor 29 is compared with the reference voltage 23 by the operational amplifier 21, and the charging current to the capacitor 2 becomes a constant current by controlling the transistors 24 and 26, so that the ion generation cycle is stabilized. The amount of ion generation is stabilized.

Here, the amount of charging current to be stabilized has the following relationship between the case where the control terminal Control is open and the case where it is connected to GND. That is,
In case of opening Charging current value = voltage value of reference voltage 23 / resistance value of resistor 20 In case of GND connection Charging current value = (voltage value of reference voltage 23 / resistance value of resistor 20) + (voltage value of reference voltage 23 / Resistance value of resistor 29)
It is.

  That is, by appropriately setting the resistors 20 and 29, the charging current can be changed by switching the control terminal Control to open or GND connection, and as a result, the ion generation amount can be changed.

Moreover, the relationship of following Formula is materialized by applying a voltage to the control terminal Control. That is,
Charging current value = (voltage value of reference voltage 23 / resistance value of resistor 20) − ((control terminal voltage−voltage value of reference voltage 23) / resistance value of resistor 29)
It is. When the control terminal voltage = 0, the above-described GND connection is used.

  That is, ion reduction control can be performed.

  Further, when the control terminal voltage is set to a value in which the charging current value is negative in this relational expression, the output of the operational amplifier 21 is always at a low level, and the ion generation operation is stopped.

  Another configuration example is shown in FIG.

  In FIG. 2, the positive input terminal of the operational amplifier 21 is connected to the outside as a reference voltage terminal Ref (charging current selection circuit), and the charging current is changed by changing the voltage applied to the reference voltage terminal Ref. The amount of ion generation changes.

The relational expression is as follows. That is,
Charging current value = voltage value applied to reference voltage terminal / resistance value of resistor 20.

  That is, ion increase / decrease control is possible.

  In addition, by setting the voltage applied to the reference voltage terminal to zero, the charging current becomes zero and ion generation stops.

  Another configuration example is shown in FIG. In FIG. 3, elements indicated by 2, 20, 21, 23, 24, 26, and 28 constitute a charging circuit. In FIG. 3, elements indicated by 2, 12, 19 constitute a voltage application circuit. 3 is different from FIG. 1 in that a two-terminal thyristor 19 is used instead of the thyristor 11 of FIG. 1 as a discharge switch element. When the charging voltage of the charging capacitor 2 reaches the breakover voltage of the two-terminal thyristor 19, the two-terminal thyristor 19 is short-circuited and ions are released. This operation is an example in which the gate ON of the thyristor 11 in FIG. 1 is replaced by the breakover of the two-terminal thyristor 19, and the basic operation is the same. With this configuration, each circuit necessary for driving the gate becomes unnecessary. The rest of the configuration is the same as that of FIG.

  Another configuration example is shown in FIG. In FIG. 4, elements indicated by 2, 20, 21, 23, 24, 26, and 28 constitute a charging circuit. In FIG. 4, elements indicated by 2, 12, and 19 constitute a voltage application circuit.

  4 is different from FIG. 2 in that a two-terminal thyristor 19 is used instead of the thyristor 11 of FIG. 2 as a discharge switch element. Therefore, each circuit required for gate driving becomes unnecessary. The rest of the configuration is the same as that of FIG.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. That is, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

The ion generator according to the present invention is
An ion generating element that generates ions by electric discharge;
A charging circuit that charges the charging capacitor with a charging current;
Charging current detecting means for detecting the charging current;
A discharge switching element that discharges the charging capacitor when a charging voltage charged in the charging capacitor reaches a predetermined value, and a voltage necessary for generating ions is applied to the ion generating element by the discharge; And a voltage application circuit that controls the charging current of the charging circuit based on the detection result of the charging current detection means, and the charging current can be changed from the outside.

  According to the above configuration, the ion generation amount can be controlled.

  Further, the ion generator according to the present invention may be configured such that, in the above configuration, the discharge switch element is an element having a function of maintaining a short-circuit operation by a current flowing through the element after the start of the short-circuit operation. Good.

  According to the above configuration, stable ion generation without malfunction can be achieved by setting a charging current lower than the holding current.

  Moreover, the ion generator which concerns on this invention may be comprised so that the said charging current may be a constant current and the said constant current value can be changed from the outside in the said structure.

  According to the above configuration, the ion generation amount can be controlled.

  Moreover, the ion generator which concerns on this invention may be comprised so that the said charging current detection circuit may detect the both-ends voltage of the charging current detection resistance connected to the said charging current supply path | route in the said structure.

  According to the above configuration, the amount of ion generation can be controlled with a simple configuration.

  Further, the ion generator according to the present invention may be configured such that in the above configuration, the control based on the detection result of the charging current detection unit is controlled based on a comparison result between the voltage of the charging current detection resistor and a reference voltage. Good.

  According to said structure, reliable constant current control and control of the amount of ion generation are attained.

  Further, the ion generator according to the present invention is the above configuration, wherein the charging current detection resistor is composed of two or more resistors, and one or more of the resistors are connected to the outside of the ion generator. The charging current may be increased and the generated ions may be increased by setting the terminal connected to the outside to the GND level.

  According to the above configuration, the amount of ion generation can be controlled with a simple configuration.

  In the ion generator according to the present invention, in the above-described configuration, it is possible to reduce ions by applying a voltage to a terminal having one terminal of the resistor connected to the outside of the ion generator. You may comprise so that the stop of the ion generation of an ion generator can be implement | achieved by applying a voltage.

  According to said structure, in addition to control of the ion generation amount by simple structure, ON / OFF control is also attained.

  In addition, the ion generator according to the present invention is configured such that, in the above configuration, the reference voltage is supplied from the outside of the ion generator, and the charge current is changed by changing the voltage value to change the generated ions. May be.

  According to the above configuration, the amount of ion generation can be controlled with a simple configuration.

  Further, in the above configuration, the ion generator according to the present invention is configured such that the ion generation of the ion generator can be stopped by setting the reference voltage to zero or less. Also good.

  According to said structure, in addition to control of the ion generation amount by simple structure, ON / OFF control is also attained.

  Moreover, you may comprise the ion generator which concerns on this invention so that the ion generator of one of the said structures was provided.

  According to the above configuration, it is possible to provide an air conditioner capable of controlling the amount of ion generation and ON / OFF control with a simple configuration.

  It can also be applied to uses such as an air conditioner.

It is a circuit diagram which shows one structural example of the ion generator which concerns on this invention. It is a circuit diagram which shows one structural example of the ion generator which concerns on this invention. It is a circuit diagram which shows one structural example of the ion generator which concerns on this invention. It is a circuit diagram which shows one structural example of the ion generator which concerns on this invention. It is a figure which shows the charging current waveform to the capacitor | condenser for charge of the ion generator of this invention. It is a circuit diagram which shows one structural example of the conventional ion generator. It is a circuit diagram which shows one structural example of the conventional ion generator. It is a figure which shows the charging current waveform to the capacitor | condenser for charge of the conventional ion generator.

Explanation of symbols

2 Charging capacitor (charging circuit, voltage application circuit)
3 Shunt regulator (voltage application circuit)
4 Transistors (voltage application circuit)
5 Resistance (voltage application circuit)
6 Resistance (voltage application circuit)
7 Capacitor (voltage application circuit)
8 Resistance (voltage application circuit)
9 Resistance (voltage application circuit)
10 Diode (voltage application circuit)
11 Thyristor (Discharge switch element, voltage application circuit)
12 transformer (voltage application circuit)
12a Transformer primary winding 12b Transformer secondary winding 13 Ion generating element 14 Relay 15 Diode 19 Two-terminal thyristor (discharge switch element, voltage application circuit)
20 Fuse resistor (current detection resistor, charging circuit)
21 Operational amplifier (comparison circuit, charging circuit)
23 Reference voltage element (charging circuit)
24 Control transistor (charging circuit)
25 Resistor 26 Switch transistor (charging circuit)
27 Constant current diode (charging circuit)
28 Resistance (charging circuit)
29 Resistance (Charging current selection circuit, selection resistance)
Control control terminal (charging current selection circuit)
Ref Reference voltage terminal (charging current selection circuit)

Claims (8)

An ion generating element that generates ions by electric discharge;
A charging circuit that charges the charging capacitor with a charging current;
It has a discharge switch element that discharges the charging capacitor when the charging voltage charged in the charging capacitor reaches a predetermined value, and a voltage necessary for ion generation is applied to the ion generating element by the discharge. In an ion generator comprising a voltage application circuit that
The charging circuit is configured to keep the current value of the charging current constant,
An ion generator comprising a charging current selection circuit for selecting a constant current value of the charging current.   The ion generator according to claim 1, wherein the discharge switch element is an element having a function of holding a short-circuit operation by a current flowing through the element after the start of the short-circuit operation. The charging circuit is
The voltage at both ends of a current detection resistor that is a resistance on the path for supplying the charging current is detected, and the charging current value is increased or decreased so that the voltage matches the reference voltage,
The charging current selection circuit is
One or more selection resistors, one end of which is connected to one end of the current detection resistor;
2. The ion generator according to claim 1, further comprising a control terminal connected to the other end of the selection resistor and open and switchable to a constant potential.   4. The ion generator according to claim 3, wherein the control terminal is switchable between an open state and a GND level as the constant potential. The constant potential of the control terminal is
The ion generator according to claim 3, wherein the ion generator has a value that stops ion generation in the ion generating element. The charging circuit is
The voltage at both ends of a current detection resistor that is a resistance on the path for supplying the charging current is detected, and the charging current value is increased or decreased so that the voltage matches the reference voltage,
2. The ion generation according to claim 1, wherein the reference voltage is supplied from the outside of the ion generator, and by changing the voltage value, the charging current is changed to change the generated ions. apparatus.   The ion generator according to claim 6, wherein the ion generation of the ion generator can be stopped by changing the reference voltage to zero or less.   An air conditioner comprising the ion generator according to any one of claims 1 to 7.

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