4. DESCRIPTION
TITLE OF THE INVENTION: AIR STERILIZER TECHNICAL FIELD OF INVENTION
The invention has the objective of developing a negative ion generator, which can generate an optimum quantity of negative ions for the working environment while suppressing the positive ion generation as much as possible.
BACKGROUND AND PROBLEM WITH EXISTING ART
Ionized air can remove particulate matter such as dust, smoke, pollen, etc. from the air. This is achieved by attaching charged particles to an oppositely charged collecting surface. A negative ionizer can let the charged particles are reintroduced into the surrounding air. These negatively charged particles issuing from the ionizer can settle down particulate matter, because particles in the air such as dust and smoke typically have a naturally occurring positive charge, they are kept in suspension in the air by electrostatic repulsion from various indoor surfaces constructed of synthetic materials which are also positively charged. When such positively charged particles interact with the negative ions generated by the ionizer, they acquire a negative charge and are attracted to these surfaces where they may be collected. As to the negative ions, it has been demonstrated

that the presence of such negative ions in the air produces beneficial physiological and psychological effects. Man-made devices used to produce negative ions typically employ either a radioactive source, ultraviolet light or an electrostatic field. The use of radioactive substances to produce negative ions has obvious drawbacks in terms of safety. Ultraviolet ionizers, in addition to consuming relatively large amounts of electrical power, also require that the electron-emitting material which is exposed to the ultraviolet radiation be periodically renewed. There is also the necessity in such devices of shielding the user from the potentially harmful ultraviolet radiation. Prior art negative ion generators using an electrostatic field have been found to produce undesirable amounts of ozone. Ozone is a very strong bleaching and oxidizing agent which can be quite toxic in amounts above the presently accepted safety level of only 50 Ppb.
The amount of ozone produced by any particular ionizer operating at a given voltage depends on a variety of factors including:
1. The quantity and ratio of positive and negative ions in the surrounding atmosphere;
2. The extent of pollution in the air;
3. The presence of electrostatic fields in proximity to the device.
4. Distance between the high voltage electrodes.
SUMMARY OF THE INVENTION
The invention has the objective of providing a negative ion generator, which can generate an optimum quantity of negative ions for the working environment while suppressing the positive ion generation as much as possible. The ionizer circuit has three sections: a dc-ac converter, a transformer and a voltage multiplier. When 12 VDC is applied, it is converted to 28 VDC using a Voltage boost converter and using 4 diodes it is converted to a pulsed ac signal. Then this ac signal is fed to a self-oscillating transformer, which is used to attain a voltage of 400V. This is fed to a capacitor-resistor ladder circuit which has an output of about 8000V. Two 10 Mega Ohm resistors are placed in the output side to limit the current. 8Kv is supplied to the discharge electrodes, which are basically Stainless-steel needles with very sharp poles. The induction plate is connected to the negative terminal of the input 12V Dc.
LIST OF PREFERRED AND OPTIONAL FEATURES
1. The device diffuses negative ions throughout the space.

2. This device is a powerful negative ion generator with ensuring close-to-zero ozone emission.
3. This device contains a series of parallelly arranged sharp pointed electrode array which results in the generation of negative ions
4. This device is safer and more energy efficient
BRIEF DESCRIPTION OF THE DRAWING
Figure: 1 Illustrates the isometric view which represents the induction electrode schematically.
Figure: 2 Illustrates the front view of induction electrode which is a thin stainless-steel plate.
Figure: 3 Illustrates the cross-sectional view of the induction electrode along line I-I in Figure 2
Figure: 4 Illustrates the exploded isometric view schematically showing the arrangement of ion generation element including the induction plate.
Figure: 5 Illustrate the assembled isometric view schematically showing a configuration of an ion generation element including the induction electrode Figure: 6 Illustrate the front view of Fig. 5
Figure: 7 Illustrate the cross-sectional view of Fig. 6 along the line II-II.
Figure: 8 Illustrates the exploded view of Fig. 6.
Figure: 9 Illustrates the exploded isometric view schematically showing a configuration of an ion generation element including the induction electrode and air duct
Figure: 10 Illustrates the isometric view schematically showing of configuration
of the device
Fig 11: EFD25 Transformer output waveform
Fig 12: EFD25 Transformer Input (Transistor collector) waveform
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
To further clarify the advantages and features of the present disclosure, a more particular description of the disclosure will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the disclosure and are therefore not to be considered limiting of its scope. The disclosure will be described and explained with additional specificity and detail with the accompanying drawings.
Additionally, experts will identify that some features in the designs have been simplified and may not have been drawn to scale. Furthermore, one or more

components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details required to understand the embodiments of the present invention, so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.
Ionized air can remove particulate matter such as dust, smoke, pollen, etc. from the air. This is achieved by attaching charged particles to an oppositely charged collecting surface. A negative ionizer can let the charged particles are reintroduced into the surrounding air. These negatively charged particles issuing from the ionizer can settle down particulate matter, because particles in the air such as dust and smoke typically have a naturally occurring positive charge, they are kept in suspension in the air by electrostatic repulsion from various indoor surfaces constructed of synthetic materials which are also positively charged. When such positively charged particles interact with the negative ions generated by the ionizer, they acquire a negative charge and are attracted to these surfaces where they may be collected.

Test Waveforms:
• MC34063 IC Switching wave form
As to the negative ions, it has been demonstrated that the presence of such negative ions in the air produces beneficial physiological and psychological effects. Man-made devices used to produce negative ions typically employ either a radioactive source, ultraviolet light or an electrostatic field. The use of radioactive substances to produce negative ions has obvious drawbacks in terms of safety. Ultraviolet ionizers, in addition to consuming relatively large amounts of electrical power, also require that the electron-emitting material which is exposed to the ultraviolet radiation be periodically renewed. There is also the necessity in such devices of shielding the user from the potentially harmful ultraviolet radiation. Prior art negative ion generators using an electrostatic field have been found to produce undesirable amounts of ozone. Ozone is a very strong bleaching and oxidizing agent which can be quite toxic in amounts above the presently accepted safety level of only 50 ppb.
The invention has the objective of providing a negative ion generator, which can generate an optimum quantity of negative ions for the working environment while suppressing the positive ion generation as much as possible. The ionizer circuit has three sections: a dc-ac converter, a transformer and a voltage multiplier. When 12 VDC is applied, it is converted to 28 VDC using a Voltage boost converter and using 4 diodes it is converted to a pulsed ac signal. Then this ac signal is fed to a self-oscillating transformer, which is used to attain a voltage of 400V. This is fed to a capacitor-resistor ladder circuit which has an output of about 8000V. Two 10 Mega Ohm resistors are placed in the output side to limit the current. 8Kv is supplied to the discharge electrodes, which are basically Stainless-steel needles with very sharp poles. The induction plate is connected to the negative terminal of the input 12VDC.

5. CLAIMS
I/We Claim:
1. An air sterilizer with non-thermal plasma negative ion generator consists of a fan for blowing air, the fan being furnished in an air blowing duct, and a couple of discharge electrodes for producing negative ions through inducing excessive negative dc voltage with inside the electrodes’ tips, the release electrodes being furnished with inside the case at positions going through the air blowing duct.
2. The discharge electrodes are kept 2.6cm apart to avoid interference between the electrodes and can be minimized. The induction plate also introduces such a way that the tips of the discharge electrode are kept equidistant from the edges of the electrode plate. A low negative voltage is applied to the induction plate which ensures more negative ion emission by eliminating the positive discharge.
3. Introducing SMD components in place of through hole components, thus achieving a greater breakdown voltage hence increasing the lifespan of the circuit.