Negative ion emitting device based on intermittent pulse

Abstract

The utility model discloses a negative ion transmitting device based on intermittent pulse, which comprises a power supply, a high voltage generator and a transmitting needle array which are electrically connected in sequence, and is characterized in that the high voltage generator comprises an intermittent pulse generating device, a boosting unit and a rectifying unit; the intermittent pulse generating device is connected to the power supply; the boosting unit is connected to the intermittent pulse generating device and the rectifying unit; and the rectification unit is connected to the emission needle array. And the working time of the intermittent pulse generating device is 0.1-1 second, and the stopping time of the intermittent pulse generating device is 0.1-1 second. According to the scheme, oxygen anions are manufactured through continuous pulse negative high voltage, accumulation of charges is eliminated through pulse intermittence, the problem that accumulation of negative charges suppresses further electron emission in turn is avoided, and the discharge efficiency is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of negative ion generation technology, and in particular relates to a negative ion emitting device based on intermittent pulses. Background Technology

[0002] The core principle of negative ion emission technology is that when a high voltage is applied to a sharp needle tip, due to the very small radius of curvature at the tip, the charge concentrates at this tip, causing a dramatic increase in the electric field near the tip. This results in a sharp increase in electric field strength near the tip. When the radius of curvature of a needle tip is approximately 0.02 mm, the electric field strength at the tip can reach 1.5 GV / m when a -30 kV voltage is applied. This strong electric field amplification effect makes the electric field strength around the needle tip much greater than at other locations, directly affecting the electron cloud distribution of atoms and causing changes in the electron binding energy. Because the electric field at the needle tip is very strong, the electron binding potential energy is relatively weak. Electrons originally bound to the needle tip surface gain enough energy to overcome the binding potential and escape from the needle tip surface through tunneling, forming a cold emission of electrons. These free electrons are then captured by surrounding neutral air molecules, forming negative ions, especially oxygen molecules, which, due to their electron affinity of only about 0.44 eV, are most easily converted into negative ions in the air, namely oxygen negative ions (O2). - The captured electrons enter the lowest unoccupied molecular orbital of the oxygen molecule and release a weak photon, which lowers the total energy of the negative ion system, forming a stable oxygen negative ion O2. - Under the influence of an electric field, these negative oxygen ions are accelerated and emitted into the surrounding environment. An increase in the electric field strength leads to an exponential increase in the electron emission rate, thereby increasing the amount of negative ions emitted.

[0003] In negative ion generators, high-voltage DC is typically used to emit negative ions. However, the electron flux density emitted by high-voltage DC changes very little over time and is mainly affected by the electric field strength and the geometry of the needle tip. Under a DC electric field, electron emission near the needle tip is usually limited by the space charge effect. When a large number of electrons are emitted around the needle tip, the accumulation of negative charge will in turn inhibit further electron emission, leading to a decrease in discharge efficiency. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by proposing a negative ion emission device based on intermittent pulses, which can overcome the accumulation of negative charge around the tip of the DC high-voltage emission needle and improve the emission efficiency of negative ions.

[0005] A negative ion emitting device based on intermittent pulses includes a power supply, a high-voltage generator, and an emitting needle array connected in sequence, characterized in that the high-voltage generator includes an intermittent pulse generating device, a boost unit, and a rectifier unit;

[0006] The intermittent pulse generator is connected to the power supply.

[0007] The boost unit is connected to the intermittent pulse generator and the rectifier unit;

[0008] The rectifier unit is connected to the transmitter pin array.

[0009] In the aforementioned negative ion emission device based on intermittent pulses, the intermittent pulse generator has an operating time of 0.1 to 1 second and a stopping time of 0.1 to 1 second.

[0010] In the above-mentioned negative ion emission device based on intermittent pulses, the stop time is longer than the working time in each intermittent cycle of the intermittent pulse generator.

[0011] The intermittent pulse generator operates for 0.3 seconds and stops for 0.4 seconds.

[0012] The intermittent pulse generator operates at a frequency of 2–20 kHz.

[0013] In the aforementioned intermittent pulse-based negative ion emission device, the boost unit is either a forward boost unit or a flyback boost unit.

[0014] In the above-mentioned negative ion emission device based on intermittent pulses, the rectifier unit includes a capacitor C10 and a multi-stage diode. The two ends of the multi-stage diode are respectively connected to the output side of the boost unit and the capacitor C10. The end of the capacitor C10 away from the multi-stage diode is connected to the end of the boost unit output side away from the multi-stage diode.

[0015] The common terminal of capacitor C10 and the multi-stage diode is connected to the emitter pin array through resistor R11, and the common terminal of capacitor C10 and the boost unit is connected to ground through resistor R2.

[0016] In the above-mentioned negative ion emission device based on intermittent pulses, the multi-stage diode includes three diodes cascaded in sequence, the cathode of the multi-stage diode is connected to the boost unit, and the anode is connected to the capacitor C10.

[0017] The capacitance of capacitor C10 is 20-1000pF;

[0018] The resistance of the resistor R11 is 1 to 3 MΩ;

[0019] The resistance of resistor R2 is 3 to 6 MΩ.

[0020] In the above-mentioned intermittent pulse-based negative ion emission device, the capacitance of capacitor C10 is 20-200pF;

[0021] The resistance of resistor R11 is 2MΩ;

[0022] The resistance of resistor R2 is 5MΩ.

[0023] In the aforementioned negative ion emission device based on intermittent pulses, the intermittent pulse generator includes a main control chip U1. The output of the main control chip U1 is connected to the base of transistor Q1 through resistor R3. The collector of transistor Q1 is connected to the gate G of power switch Q2 through resistor R4. The drain of power switch Q2 is connected to the input side of the boost unit. The gate G of power switch Q2 is connected to the power supply through resistor R5. The source S is connected to the power supply.

[0024] In the above-mentioned negative ion emission device based on intermittent pulses, the boost unit includes an input coil L1 and an output coil L2, the intermittent pulse generator is connected to the input coil, and the rectifier unit is connected to the output coil L2.

[0025] The drain of the power switch Q2 is connected to one end of the input coil L1 and the output coil L2 corresponding to the output terminals to form a forward boost unit.

[0026] Alternatively, the drain of the power switch Q2 can be connected to one end of the input coil L1 and the output coil L2 corresponding to the input terminals to form a flyback boost unit.

[0027] In the above-mentioned negative ion emission device based on intermittent pulse, the emission needles of the emission needle array have sharp needle tips, the number of emission needles in the emission needle array is 108±20, the needle length is 22±5cm, and the radius of curvature of the needle tip is 0.01±0.01mm.

[0028] The firing needle is made of beryllium copper plated with gold.

[0029] The advantages of this utility model are:

[0030] 1. This scheme generates oxygen negative ions through continuous pulsed negative high voltage. The intermittent pulses eliminate the accumulation of charge, avoiding the problem that the accumulation of negative charge will inhibit further electron emission and ensuring discharge efficiency.

[0031] 2. The intermittent pulsed negative high voltage of this scheme causes irregular movement of electrons, which intensifies their collisions. The collisions between electrons lead to energy exchange, which causes a sharp change in the energy state of electrons, greatly increasing the probability of electron tunneling and enabling more electrons to overcome the potential barrier and be emitted, thereby increasing the emission of negative ions.

[0032] 3. Compared with traditional DC high voltage, the same peak high voltage can generate a higher content of negative ions. At the same time, due to the intermittent operation of the pulse generator and the improvement of electron emission efficiency, the accumulation of negative ions in local areas is reduced, thereby reducing the possibility of negative ions reacting with oxygen molecules in the air to form ozone, thus producing less ozone. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the principle of the negative ion emission device based on intermittent pulses of this utility model;

[0034] Figure 2 This is a circuit for implementing the negative ion emission device based on intermittent pulses according to this utility model;

[0035] Figure 3 This is another implementation circuit for the negative ion emission device based on intermittent pulses according to this utility model.

[0036] Reference numerals: Power supply 1, high voltage generator 2, intermittent pulse generator 201, boost unit 202, rectifier unit 203, transmitting needle array 3. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 As shown, this embodiment provides a negative ion emission device based on intermittent pulses, including a power supply 1, a high-voltage generator 2, and an emission needle array 3 connected in sequence. The high-voltage generator 2 includes an intermittent pulse generator 201, a boost unit 202, and a rectifier unit 203. The intermittent pulse generator 201 is connected to the power supply 1. The boost unit 202 is connected to the intermittent pulse generator 201 and the rectifier unit 203. The rectifier unit 203 is connected to the emission needle array 3.

[0039] In this embodiment, the transmitting needles of the transmitting needle array 3 have sharp needle tips, the transmitting needle array 3 has 108 transmitting needles, the needle length is 22cm, the needle tip is 0.01mm, and the needle material is beryllium copper plated with gold.

[0040] The intermittent pulse generator 201 operates for 0.1–1 s and stops for 0.1–1 s. Preferably, the stop time is longer than the operating time within each intermittent cycle of the intermittent pulse generator 201. In this embodiment, the intermittent pulse generator 201 operates at a frequency of 20 kHz, with each intermittent cycle having an operating time of 0.3 s and a stop time of 0.4 s. After power supply 1 is turned on, the intermittent pulse generator 201 outputs pulses at a frequency of 20 kHz with an operating time of 0.3 s and a stop time of 0.4 s. The pulse voltage is boosted into an intermittent negative high voltage by the boost unit 202, and then rectified by the rectifier unit 203 to obtain a pulse high voltage with fluctuations of -22 kV to +5 kV and an intermittent stop time of approximately 0.4 s. The pulse voltage is delivered to the emitting needles of the emitting needle array 3, which have sharp tips and emit negative ions through the needle tip-high voltage corona principle.

[0041] Specifically, such as Figure 2 As shown, the rectifier unit 203 in this embodiment includes a capacitor C10 and a multi-stage diode. The two ends of the multi-stage diode are connected to the output side of the boost unit 202 and the capacitor C10, respectively. The end of the capacitor C10 furthest from the multi-stage diode is connected to the end of the output side of the boost unit 202 furthest from the multi-stage diode. The common terminal of the capacitor C10 and the multi-stage diode is connected to the emitter pin array 3 through a resistor R11, and the common terminal of the capacitor C10 and the boost unit 202 is connected to ground through a resistor R2.

[0042] Specifically, the multi-stage diode includes three diodes VD5, VS1, and VD2 cascaded in sequence. The cathode of the multi-stage diode is connected to the boost unit 202, and the anode is connected to the capacitor C10. The pulsed high voltage is boosted by the boost unit and then rectified and boosted by the multi-stage diode capacitor. This reduces the number of turns ratio and the difference in the number of turns between the primary and secondary coils while achieving the same required negative ion operating voltage and voltage difference. This reduces the voltage transformation ratio of the transformer, reduces the required number of coil turns, simplifies the transformer design, and improves the boost efficiency to some extent.

[0043] The capacitance of capacitor C10 is 20–1000 pF, preferably 100 pF in this embodiment. The resistance of resistor R11 is 1–3 MΩ, preferably 2 MΩ in this embodiment. The resistance of resistor R2 is 3–6 MΩ, preferably 5 MΩ in this embodiment.

[0044] The boost unit 202 includes an input coil L1 and an output coil L2. An intermittent pulse generator 201 is connected to the input coil L1, and a rectifier unit 203 is connected to the output coil L2. By varying the connection between the intermittent pulse generator 201 and the input coil L1, a forward boost unit 202 or a flyback boost unit can be constructed.

[0045] The intermittent pulse generator 201 can directly use an existing pulse generator with the required operating frequency and intermittent operating mode, or it can be manufactured by those skilled in the art to have the required operating frequency and intermittent operating mode, such as... Figure 2 As shown, this embodiment provides an intermittent pulse generator 201 with the following circuit structure:

[0046] The system includes a main control chip U1, specifically an STM32G030F6 selected in this embodiment. The output terminal PB3 of the main control chip U1 is connected to the base of transistor Q1 via resistor R3. The collector of transistor Q1 is connected to the gate G of power switch Q2 via resistor R4. The drain of power switch Q2 is connected to the input side of boost unit 202. The gate G of power switch Q2 is connected to power supply 1 via resistor R5, and the source S is also connected to power supply 1. In this embodiment, transistor Q1 is an S8050, and power switch Q2 is an IRF4905.

[0047] like Figure 2 and Figure 3 As shown, pin 3 of the output coil L2 of the boost unit 202 is connected to the power supply ground via resistor R2. Pin 4 of the output coil L2 is connected to the transmitter pin array 3 via diodes VD5, VD1, VD2 in series and current-limiting resistor R11. Pin 1 of the input coil L1 corresponds to pin 4 of the output coil L2, and pin 2 corresponds to pin 3 of the output coil L2. In one embodiment, the drain of Q2 is connected to pin 2 of the input coil L1 of the boost unit 202, and pin 1 of the input coil L1 is connected to ground. In this configuration, the boost unit is a forward converter. In another embodiment, as shown... Figure 3 As shown, the drain of Q2 is connected to the first pin of the input coil L1 of the boost unit 202, and the second pin of the input coil L1 is connected to ground. In this connection, the boost unit is a flyback boost type.

[0048] In this embodiment, the two intermittent pulse-based negative ion emission devices, namely the forward booster and flyback booster, were tested using a DLY-6N3 air negative ion measuring instrument from Southeast Electronic Technology Research Institute of Zhangzhou City. At a distance of 35cm from the needle tip, the negative ion content in both devices was approximately 110 million ions / cm³, and a noticeable ion wind was observed, indicating that the specific booster method has no significant impact on the negative ion generation efficiency. In addition, the following experiments were also conducted in this embodiment:

[0049] 1) Replace the intermittent pulse generator with a continuously operating pulse generator, operating continuously at the same frequency of 20kHz, with other circuit structures remaining the same. Figure 2The results were consistent, and then the same negative ion tester was used to measure the negative ion content at a distance of 35cm from the needle tip, which was approximately 0.8 billion ions / cm3.

[0050] 2) Replace capacitor C10 from 100pF to 1000pF, and keep the other circuit structures the same. Figure 2 Consistent, using the same negative ion tester, the negative ion content was measured at a distance of 35cm from the needle tip, which was approximately 0.7 billion ions / cm3.

[0051] 3) Replace the intermittent pulse generator with a continuously operating pulse generator, operating at the same frequency of 20kHz. Simultaneously, replace the capacitance of capacitor C10 from 100pF to 1000pF. Other circuit structures remain the same. Figure 2 Consistent with the same negative ion tester, the negative ion content was measured at a distance of 35cm from the needle tip, which was approximately 0.6 billion ions / cm3, and the ion wind was barely perceptible.

[0052] The above test results show that the intermittent pulse generator can significantly increase the negative ion content and improve the emission efficiency of the negative ion generator, and the combination of the 100pF capacitor C10 and the intermittent pulse generator can achieve the best negative ion generation effect.

[0053] The specific embodiments described in this example are merely illustrative of the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0054] The circuit configurations of the components in the embodiments described and illustrated in the figures are merely illustrative of implementation methods of the present invention. Their principles may be simplified, fine-tuned, or transformed from actual circuits. The circuit principles and configurations shown are not intended to limit the present invention. Those skilled in the art can easily modify the circuit configurations to implement the principle based on the illustrated circuit principles; for example, an intermittent pulse generator can be implemented in many other ways. All such modifications should be within the protection scope of this utility model.

Claims

1. A negative ion emitting device based on intermittent pulses, comprising a power supply (1), a high-voltage generator (2), and an emitting needle array (3) connected in sequence, characterized in that, The high-voltage generator (2) includes an intermittent pulse generator (201), a boost unit (202), and a rectifier unit (203); The intermittent pulse generator (201) is connected to the power supply (1); The boost unit (202) is connected to the intermittent pulse generator (201) and the rectifier unit (203); The rectifier unit (203) is connected to the transmitter pin array (3).

2. The negative ion emitting device based on intermittent pulses according to claim 1, characterized in that, The intermittent pulse generator (201) used has a working time of 0.1 to 1 s and a stopping time of 0.1 to 1 s.

3. The negative ion emission device based on intermittent pulses according to claim 2, characterized in that, Within each intermittent cycle of the intermittent pulse generator (201), the stop time is longer than the working time; The intermittent pulse generator (201) operates for 0.3 seconds and stops for 0.4 seconds. The intermittent pulse generator (201) operates at a frequency of 2 to 20 kHz.

4. The negative ion emitting device based on intermittent pulses according to any one of claims 1 to 3, characterized in that, The boost unit (202) is a forward boost unit (202) or a flyback boost unit (202).

5. The negative ion emitting device based on intermittent pulses according to claim 4, characterized in that, The rectifier unit (203) includes a capacitor C10 and a multi-stage diode. The two ends of the multi-stage diode are respectively connected to the output side of the boost unit (202) and the capacitor C10. The end of the capacitor C10 away from the multi-stage diode is connected to the end of the output side of the boost unit (202) away from the multi-stage diode. The common terminal of capacitor C10 and the multi-stage diode is connected to the emitter array (3) through resistor R11, and the common terminal of capacitor C10 and the boost unit (202) is connected to ground through resistor R2.

6. The negative ion emitting device based on intermittent pulses according to claim 5, characterized in that, The multi-stage diode includes three diodes cascaded in sequence. The cathode of the multi-stage diode is connected to the boost unit (202), and the anode is connected to the capacitor C10. The capacitance of capacitor C10 is 20-1000pF; The resistance of the resistor R11 is 1 to 3 MΩ; The resistance of resistor R2 is 3 to 6 MΩ.

7. The negative ion emitting device based on intermittent pulses according to claim 6, characterized in that, The capacitance of capacitor C10 is 20-200pF; The resistance of resistor R11 is 2MΩ; The resistance of resistor R2 is 5MΩ.

8. The negative ion emitting device based on intermittent pulses according to claim 4, characterized in that, The intermittent pulse generator (201) includes a main control chip U1. The output of the main control chip U1 is connected to the base of transistor Q1 through resistor R3. The collector of transistor Q1 is connected to the gate G of power switch transistor Q2 through resistor R4. The drain of power switch transistor Q2 is connected to the input side of the boost unit (202). The gate G of power switch transistor Q2 is connected to the power supply (1) through resistor R5. The source S is connected to the power supply (1).

9. The negative ion emitting device based on intermittent pulses according to claim 8, characterized in that, The boost unit (202) includes an input coil L1 and an output coil L2. The intermittent pulse generator (201) is connected to the input coil, and the rectifier unit (203) is connected to the output coil L2. The drain of the power switch Q2 is connected to one end of the input coil L1 and the output coil L2 corresponding to the output terminals to form a forward boost unit (202); Alternatively, the drain of the power switch Q2 is connected to one end of the input coil L1 and the output coil L2 corresponding to the input terminal to form a flyback boost unit (202).

10. The negative ion emission device based on intermittent pulses according to claim 1, characterized in that, The transmitting needles of the transmitting needle array (3) have sharp needle tips.

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