TW201834341A - Control system of a balanced micro-pulsed ionizer blower - Google Patents

Abstract

In one embodiment of the invention, a method of automatically balancing ionized air stream created in bipolar corona discharge is provided. The method comprises: providing an air moving device with at least one ion emitter and reference electrode connected to a micro-pulsed AC power source, and a control system with at least one ion balance monitor and corona discharge adjustment control; generating variable polarity groups of short duration ionizing micro-pulses: wherein said micro-pulses are predominantly asymmetric in amplitude and duration of both polarity voltages and have a magnitude of at least one polarity ionizing pulses exceed the corona threshold.

Description

Control system of balanced micro-pulse ionizing blower

Embodiments of the present invention relate generally to ionizing blowers.

The electrostatic charge neutralizer is designed to remove or minimize the accumulation of electrostatic charges. An electrostatic charge neutralizer removes electrostatic charges by generating air ions and supplying them to a charged target.

One particular category of electrostatic charge neutralizers is the ionizing blower. Ionization blowers typically generate air ions with a corona electrode and use a fan (or multiple fans) to direct the air ions towards the target of interest.

The behavior of monitoring or controlling the execution of a blower uses two measures.

The first measure is balance. The ideal equilibrium occurs when the number of positive air ions is equal to the number of negative air ions. On a charge plate monitor, the ideal reading is zero. In fact, the electrostatic neutralizer is controlled in a small range around zero. For example, the balance of an electrostatic neutralizer can be specified as approximately ± 0.2 volts.

The second measure is air ion current. Higher air ion currents are useful because electrostatic charges can be discharged in a shorter period of time. Higher air ion currents are associated with lower discharge times, which are measured with a charge plate monitor.

In one embodiment of the present invention, a method for automatically balancing the ionized gas flow generated in a bipolar corona discharge is provided. The method includes the steps of providing an air moving device having at least one ion emitter and a reference electrode connected to a micro-pulse AC power source, and a control system having at least one ion balance monitor and a corona discharge. Adjustment control; generating short-duration ionized micropulses of a variable polarity group, wherein most of the micropulses are asymmetric in the amplitude and duration of the voltage of the two polarities and have a value exceeding the corona threshold The value of at least one polarity ionization pulse.

In another embodiment of the present invention, an apparatus for an auto-balanced ionization blower is provided. The device includes: an air moving device and at least one ion emitter and a reference electrode, the at least one ion emitter and the reference electrode are both connected to a high voltage source; and an ion balance monitor; wherein the transformer of the high voltage source, the The ion emitter and the reference electrode are arranged as a closed loop for an AC current circuit, and the loop is connected to ground through a high-valued viewing resistor.

In the following detailed description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of various embodiments of the invention. Those skilled in the art will recognize that the various embodiments of the present invention are illustrative only and are not intended to be limiting in any way. Those skilled in the art who have benefited from the disclosure herein will readily think of other embodiments of the invention.

Embodiments of the present invention can be applied to many types of air gas ionizers configured, for example, as an ionization rod, a blower, or an in-line ionization device.

A wide range of ionization blowers need to combine highly efficient air ionization with short discharge times and strict ion balance control. FIG. 1A is a block diagram of a general view of an ionizing blower 100 according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view of the blower 100 of FIG. 1A along line A-A. Efficient air ionization is achieved by generating a bipole between an array of emission points 102 (ie, emission point array 102) and two reference electrodes 104, 105 (shown as upper reference electrode 104 and lower reference electrode 105). Corona discharge is achieved. The emission point 102 is mounted on a protective grille 106 (ie, the air passage 106), which also helps to accelerate the ionized air flow.

The fan 103 (FIG. 1A) is an air moving device that provides a highly variable air flow 125 in the space 130 between the emission point array 102 (the ion emitter 102) and the two reference electrodes 104, 105. The air passage 106 concentrates and distributes the air flow 125 in the corona discharge space 130. The corona, which generates positive and negative ions, moves between the electrodes 102, 104, and 105. The air stream 125 can carry and carry only a relatively small portion of the positive and negative ions generated by the corona discharge.

According to an embodiment of the present invention, the air 125 is forced out of the outlet 131 of the air passage (106) and the air 125 passes through the air ionization sensor 101. Details of one embodiment of the design of the sensor 101 are shown in FIG. 1C. A fan (shown as block 126 in Figure 1B) provides a flow of air 125. The air ionization voltage sensor 101 has a louver-shaped thin dielectric plate 109 stretched over the entire width of the air passage 106. The louver plate 109 guides a part 125a (or a sample 125a) of the ionized air flow 125b (the ionized air flow 125b) from the air passage 106 and the upper electrode 104 (also refer to FIG. 2A), so that the sensor 101 can sense Some portion of the ionic charge in the portion 125a of the ionized air stream 125b is detected and collected. The collected ion charge then generates a control signal 250 (FIG. 2) for use by an algorithm 300 (FIG. 3) for balancing ions in the ionization blower 100. The top side 132 of the plate 109 has a narrow metal strip serving as the sensitive electrode 108, while the bottom side 133 has a wider ground flat electrode 110. This electrode 110 is generally shielded so as to shield the air ionization sensor 101 from the high electric field of the emission point array 102. Electrode 108 collects some of the ionic charge (Figure 2A) that causes a voltage / signal 135 that is proportional to the ion balance in the ionized air stream 125b. The voltage / signal 135 from the sensor 101 is used by the control system 107 (shown as system 200 in Figure 2) to monitor and adjust the ion balance in the ionized air stream 125b. This signal 135 is also represented by a signal 250, which is input to the sample-and-hold circuit 205 as discussed below. Other configurations of the ion balance sensor (such as in the form of a conductive grid or a metal mesh immersed in an ion stream) can also be used in other embodiments of the invention.

According to another embodiment of the present invention, the ion current sensor 204 is used to monitor the balance of the ionized flow. Accordingly, one embodiment of the present invention provides a system 200 (FIG. 2) that includes an ionized return current sensor 204 for monitoring the balance of ionized air flow. In another embodiment of the present invention, the system 200 includes an air ionization voltage sensor 101 for monitoring the equilibrium of the ionized air flow.

In yet another embodiment of the present invention, the system 200 includes dual sensors. The dual sensors include an air ionization voltage sensor 101 and an ionization current return sensor 204. Two of the sensors 101 And 204 are configured to monitor the ionized air flow balance.

In some examples, the ionization voltage sensor 101 and / or the ionization current return sensor 204 are remote sensors directly connected to the control system 107. In certain other examples, the ionized voltage sensor 101 and / or the ionized current return sensor 204 is implemented as a remote device with radio frequency (RF) communication, Bluetooth, and / or any other wireless method for communication Wireless sensor. The remote sensor refers to a sensor external to the ionization blower 100. The exemplary ionization blower 100 may receive an active (eg, by a wired and / or wireless remote ionization voltage sensor 101 and / or ionization current return sensor 204 at the control system 107 of the ionization blower 100) Powered) and / or passive (eg not powered) feedback signals.

Because the ionization blower 100 can be used to return multiple or even large numbers (for example, tens, hundreds, or more) of the ionization blower 100 and the wireless ionization voltage sensor 101 and / or the ionization current return sensor. 204 is used in applications or environments within the wireless communication range of the ionized voltage sensor 101 and / or the ionized current return sensor 204. In some examples, the ionized voltage sensor 101 and / or ionized The current return sensor 204 is individually addressable and has a unique identification code to allow the sensors 101, 204 to be specifically paired with individual ionizing blowers 100.

In an example where the ionized voltage sensor 101 and / or the ionized current return sensor 204 are remote sensors, the exemplary control system 107 includes a communication circuit to remove the ionized voltage sensor 101 and / or ions from The return current sensor 204 receives wired and / or wireless communications.

The ionization current return sensor 204 includes a capacitor C2 and a capacitor C1 and resistors R1 and R2. Capacitor C2 provides an AC current path to ground that bypasses the current detection circuit. The resistor R2 converts the ion current into a voltage (Ii * R2), and the resistors R1 and R2 and the capacitor C2 form a low-pass filter to filter out the induced current generated by the micropulse. The return current 210 flowing from the sensor 204 is shown as I2.

The current 254 flowing to the emission point 102 is the sum of currents Σ (Ii (+), Ii (-), I2, Ic1, Ic2), where the currents Ic1 and Ic2 are the currents flowing through the capacitors C1 and C2, respectively.

FIG. 2A illustrates an ion current 220 flowing between the emitter 102 and the reference electrodes 104 and 105. The air stream 125 from the air passage 106 converts a part of the two ion currents 220 into the ionized air stream 125b, which moves toward the charge neutralization target outside the blower 100. The target is shown generally as block 127 in FIG. 1B, which can be placed in different positions relative to the ionizing blower 100.

FIG. 2B illustrates an electrical block diagram of a system 200 in an ionizing blower 100 according to an embodiment of the present invention. The system 200 includes an ion current sensor 204, a micro-pulse high-voltage power source 230 (micro-pulse AC power source 230) (which is formed by a pulse driver 202 and a high-voltage (HV) transformer 203), and a control system 201 for an ionization blower. In one embodiment, the control system 201 is a microcontroller 201. The microcontroller 201 receives power from a voltage bias 256, which may be, for example, at a voltage of about 3.3 DC and grounded at line 257.

The power converter 209 may optionally be used in the system 200 to provide various voltages (eg, -12 VDC, 12 VDC, or 3.3 VDC) used by the system 200. The power converter 209 may convert a voltage source value 258 (eg, 24 VDC) into various voltages 256 for biasing the microcontroller 201.

The micro-pulse high-voltage power supply 230 has a pulse driver 202 controlled by a microcontroller 201. The pulse driver 202 is connected to a boost pulse transformer 203. Transformer 203 generates short duration pulses (in the range of microseconds), which pulses have positive and negative polarity with a magnitude sufficient to generate a corona discharge. The secondary coil of the transformer 203 is floating with respect to the ground. The high-voltage terminal 250 of the transformer 203 is connected to the emission point array 102, and the low-voltage terminal 251 of the transformer 203 is connected to the reference electrodes 104, 105.

Short-duration high-voltage AC pulses (generated by the high-voltage power supply 230) cause significant capacitive or displacement currents Ic1 and Ic2 to flow between the electrodes 102, 104, and 105. For example, a current Ic1 flows between the electrode (emission point) 102 and the upper reference electrode 104, and a current Ic2 flows between the electrode 102 and the lower reference electrode 105. The relatively small positive and negative ion corona currents labeled Ii (+) and Ii (-) leave this ion generation system 200 into the environment outside the blower 100 and move toward the target.

In order to separate the capacitor current and the ion current, the ion generating system 200 is arranged in a closed-loop circuit for high-frequency AC capacitor currents labeled Ic1 and Ic2 as a secondary coil of the transformer 203, and the corona electrodes 102, 104, and 105 are opposite to The ground is substantially floating and the ionic currents Ii (+) and Ii (-) have a return path to the ground (and are transmitted to the ground). The AC current has a significantly lower resistance than these AC currents delivered to ground to circulate inside this loop.

System 200 includes an ion balance monitor that provides separated ions from a pulsed AC current by arranging a closed-loop current path between a pulsed AC voltage source 230, the ion emitter 102, and a reference electrode 104 or 105 Convection current (separation ions convection current).

In addition, ion balance monitoring is performed in the system 200 during periods between micropulses. In addition, ion balance monitoring is performed by integrating the differential signals of positive and negative convection currents.

The transformer 203, the ion emitter 102, and the reference electrode 104 or 105 of the high-voltage source 230 are arranged in a closed loop for an AC current circuit, and the closed loop is connected by a high-value viewing resistor R2 To ground.

The law of conservation of charge stipulates that when the output of the AC voltage source 230 (through the transformer 203) is floating, the ion current is equal to the sum of the positive Ii (+) ion current and the negative Ii (-) ion current. The currents Ii (+) and Ii (-) must be returned to the circuit system of the return current sensor 204 in the system 200. The amount of ionic current for each polarity is:

Ii (+) = Q (+) * N (+) * U and Ii (-) = Q (-) * N (-) * U

Where A is the charge of positive or negative ions, N is the ion concentration, and U is the air flow. If the absolute values of the positive Ii (+) current and the negative Ii (-) current are the same, the ion equilibrium will be reached. It is known in the art that the two polarities of air ions carry approximately the same amount of charge (equal to one electron). Therefore, another condition for ion balance is that the concentrations of the ions of the two polarities are equal. Compared to the return current sensor 204 (ion balance monitor 204), which is sensitive to changes in ion current, the air ionization voltage sensor 101 (ion balance monitor 101) is more sensitive to changes in ion concentration. Therefore, the reaction speed of the air ionization voltage sensor (capacitive sensor) 101 is generally faster than that of the ionization return current sensor 204.

The larger number of positive ions detected by the sensor 101 causes the sensor 101 to generate a positive output voltage that is input to the sample-and-hold circuit 205 (and is processed by the sample-and-hold circuit). The larger number of negative ions detected by the sensor 101 causes the sensor 101 to generate a negative output voltage that is input to the sample-and-hold circuit 205 (and is processed by the sample-and-hold circuit). In contrast, as described similarly above, the absolute values of positive Ii (+) and negative Ii (-) are used by the sensor 204 to output a signal 250 for input into the sample-and-hold circuit 205 to determine and reach Ion balance in the ionization blower 100.

At the time between the micropulse trains, the sampling signal 215 will turn off the switch 216, so that the amplifier 218 is connected to the capacitor C3, which is then charged to a certain value based on and in response to the input signal 250.

The ion current floating with the airflow is characterized by a very low frequency and can be monitored by passing through the high-million ohm resistor circuit systems R1 and R2 to ground. To minimize the effects of capacitive and parasitic high-frequency currents, the sensor 204 has two bypass capacitor paths with C1 and C2.

The difference between the currents Ii (+) and Ii (-) is continuously measured by the sensor 204. The resulting current via the resistor circuits R1, R2 generates a voltage / signal that is proportional to the time-integrated / average ion balance of the airflow leaving the blower. The resulting current is shown as current 214, which is represented by the sum Σ (Ii (+), Ii (-)).

Ion balance monitoring is achieved by measuring the voltage output of the current sensor 204, or by measuring the output of the voltage sensor 101, or by measuring the voltage from the air ionization sensors 101 and 204 . For the sake of clarity, the voltage output of the current sensor 204 and the voltage output of the voltage sensor 101 are each shown by the same signal 250 in FIG. 2. This signal 250 is applied to the input of the sample-and-hold circuit 205 (sampling circuit 205) controlled by the microcontroller 201 through the sample signal 215. The sample signal turns on the switch 216 to trigger the sample-and-hold operation on the signal 250.

In some cases or embodiments for a corona system, diagnostic signals from both sensors 101 and 204 may be compared. These diagnostic signals are input to the sample-and-hold circuit 205 as a signal 250.

The signal 250 is then adjusted by the low-pass filter 206 and amplified by the amplifier 207 before being applied to the input of an analog-to-digital converter (ADC) located in the microcontroller 201. The sample-and-hold circuit 205 samples the signal 250 between pulse times to minimize noise in the recovered signal 250. Capacitor C3 holds the last signal value between sampling times. The amplifier 207 amplifies the signal 250 to a more usable level for the microcontroller 201, and this amplified signal from the amplifier 207 is shown as a balanced signal 252.

The microcontroller 201 compares the balance signal 252 with a setpoint signal 253, which is a reference signal generated by the balance adjustment potentiometer 208. The setpoint signal 253 is a variable signal that can be adjusted by the potentiometer 208.

The setpoint signal 253 can be adjusted to compensate for different ionizing blower 100 environments. For example, the reference level (ground) near the output 131 (FIG. 1B) of the ionization blower 100 may be about zero, and the reference level near the ionization target may not be zero. For example, if the location of the ionization target has a strong ground potential value, more negative ions may be lost at that location. Therefore, the setpoint signal 253 can be adjusted so that the non-zero value of the reference level at the position of the ionization target is compensated. The setpoint signal 253 can be reduced in this case so that the microcontroller 201 can drive the pulse driver 202 to control the HV transformer 230 to produce an HV output 254, which generates more positive ions at the emission point 102 (due to a lower setting The point value 253 is used for comparison to trigger the production of more positive ions) to compensate for the loss of negative ions at the location of the ionization target.

Reference is now made to FIGS. 2 and 8. In an embodiment of the present invention, the ionization blower 100 may achieve ion balance in the ionization blower 100 based on at least one or more of the following steps: (1) by increasing and / or decreasing the positive pulse width Values and / or negative pulse width values; (2) by increasing and / or decreasing the time between positive pulses and / or the time between negative pulses; and / or (3) by increasing and / or decreasing the positive pulses And / or the number of negative pulses, as described below. The microcontroller 201 outputs a positive pulse output 815 and a negative pulse output 816 (FIGS. 2 and 8), and these outputs are driven into a pulse driver 202 and control the pulse driver. In response to the outputs 815 and 816, the transformer 230 generates an ionization waveform 814 (HV output 814), which is applied to the emission point 102 to generate a certain amount of positive ions and a certain amount of negative ions based on the ionization waveform 814.

As an example, if the sensor 101 and / or the sensor 204 detects an imbalance in the ionization blower 100, and the amount of positive ions in the blower 100 exceeds the amount of negative ions, it enters the balance signal of the microcontroller 201 252 will indicate that this ion is unbalanced. The microcontroller 201 will lengthen the negative pulse width (duration) 811 of the negative pulse 804. As the width 811 becomes longer, the amplitude of the negative micropulse 802 increases. The positive micropulse 801 and the negative micropulse 802 are high-voltage outputs driven to the emission point 102. The increased amplitude of the negative micropulses 802 will increase the negative ions generated from the emission point 102. The ionization waveform 814 has produced a variable-polarity group of ionization micropulses 801 and 802 of short duration. The majority of the micropulses 801 and 802 are asymmetric in amplitude and duration of the two polar voltages, and have at least one polarity ionization pulse with a value exceeding a corona threshold.

Once the maximum pulse width is reached for the negative pulse width 811, if the amount of positive ions in the blower 100 still exceeds the amount of negative ions, the microcontroller 201 will shorten the positive pulse width (duration) 810 of the positive pulse 803. Because the width 810 is shortened, the amplitude of the positive micropulse 801 is reduced. The reduced positive micropulse 801 amplitude will reduce the positive ions generated from the emission point 102.

Alternatively or additionally, if the amount of positive ions in the blower 100 exceeds the amount of negative ions, the microcontroller 201 will lengthen the negative by increasing the negative repeat rate (Rep-Rate) 813 (the time interval between negative pulses 804). Time between pulses 804. Because the negative repetition rate 813 is lengthened, the time between the negative micropulses 802 is also increased. As a result, a longer or longer negative repetition rate 813 will increase the time between the negative micropulses 802, which in turn will increase the amount of time that negative ions are generated from the emission point 102.

Once the minimum negative repetition rate has been reached for the negative repetition rate, if the amount of positive ions in the blower 100 still exceeds the amount of negative ions, the microcontroller 201 will reduce the positive repetition rate 812 (the time interval between positive pulses 803) to The time between the positive pulses 803 is shortened. Because the positive repetition rate 812 is shortened, the time between the positive micropulses 801 is also reduced. As a result, a shortened or shorter positive repetition rate 811 will reduce the time between the positive micropulses 803, which in turn will reduce the amount of time that positive ions are generated from the emission point 102.

Alternatively or additionally, if the amount of positive ions in the blower 100 exceeds the amount of negative ions, the microcontroller 201 will increase the number of negative pulses 804 in the negative pulse output 816. The microcontroller 201 has a negative pulse counter, which can be increased to increase the number of negative pulses 804 in the negative pulse output 816. Because the number of negative pulses 804 increases, the number of negative pulse trains in the negative pulse output 816 increases, and this increases the number of negative micropulses 802 in the HV output, which is an ionized waveform applied to the emission point 102 814.

Once the maximum negative pulse amount has been added to the negative pulse output 816, if the amount of positive ions in the blower 100 still exceeds the amount of negative ions, the microcontroller 201 will reduce the number of positive pulses 803 in the positive pulse output 815. The microcontroller 201 has a positive pulse counter, which can be reduced to reduce the number of positive pulses 803 in the positive pulse output 815. Because the number of positive pulses 803 is reduced, the number of positive pulses in the positive pulse output 815 is reduced, and this reduces the number of positive micropulses 801 in the HV output, which is an ionized waveform applied to the emission point 102 814.

The following example is directed to achieving the ion balance in the blower 100 when the amount of negative ions in the blower 100 exceeds the amount of positive ions.

If the sensor 101 and / or the sensor 204 detects an imbalance in the ionization blower 101, where the amount of negative ions in the blower 101 exceeds the amount of positive ions, the balance signal 252 entering the microcontroller 201 will indicate this Ions are not balanced. The microcontroller 201 will lengthen the positive pulse width 812 of the positive pulse 803. As the width 810 becomes longer, the amplitude of the positive micropulse 801 increases. The increased amplitude of the positive micropulses 801 will increase the positive ions generated from the emission point 102.

Once the maximum pulse width is reached for the positive pulse width 812, if the amount of negative ions in the blower 100 still exceeds the amount of positive ions, the microcontroller 201 will shorten the negative pulse width 811 of the negative pulse 804. Because the width 811 is shortened, the amplitude of the negative micropulse 802 is reduced. The reduced amplitude of the negative micropulses 802 will reduce the negative ions generated from the emission point 102.

Alternatively or additionally, if the amount of negative ions in the blower 100 exceeds the amount of positive ions, the microcontroller 201 will lengthen the time between the positive pulses 803 by increasing the positive repetition rate 812. Because the positive repetition rate 812 is lengthened, the time between the positive micropulses 801 is also increased. As a result, a longer or longer positive repetition rate 812 will increase the time between the positive micropulses 801, which in turn will increase the amount of time that positive ions are generated from the emission point 102.

Once the minimum positive repetition rate has been reached for the positive repetition rate 812, if the amount of negative ions in the blower 100 still exceeds the amount of positive ions, the microcontroller 201 will lengthen the time between the negative pulses 804 by increasing the negative repetition rate 813. Because the negative repetition rate 813 is lengthened, the time between the negative micropulses 802 is also increased. As a result, a longer or longer negative repetition rate 813 will increase the time between the negative micropulses 802, which in turn will reduce the amount of time that negative ions are generated from the emission point 102.

Alternatively or additionally, if the amount of negative ions in the blower 100 exceeds the amount of positive ions, the microcontroller 201 will increase the number of positive pulses 803 in the positive pulse output 815. The microcontroller 201 has a positive pulse counter, which can be increased to increase the number of positive pulses 803 in the positive pulse output 815. Because the number of positive pulses 803 increases, the number of positive pulse trains in the positive pulse output 815 increases, and the number of positive micro pulses 801 in the HV output increases. The HV output is an ionized waveform 814 applied to the emission point 102.

Once the maximum positive pulse amount has been added to the positive pulse output 815, if the negative ion amount in the blower 100 still exceeds the positive ion amount, the microcontroller 201 will reduce the number of negative pulses 804 in the negative pulse output 816. The microcontroller 201 has a negative pulse counter, which can be reduced to reduce the number of negative pulses 804 in the negative pulse output 816. Because the number of negative pulses 804 is reduced, the number of negative pulse trains in the negative pulse output 816 is shortened, and the number of negative micropulses 802 in the HV output is reduced.

If the ion imbalance (which is reflected in the balance current value 252) is not significantly different from the set point 253, a small adjustment on the ion imbalance may be sufficient, and the microcontroller 201 can adjust the pulse width 811 and / or 810 To achieve ion balance.

If the ion imbalance (which is reflected in the equilibrium current value 252) is moderately different from the set point 253, a moderate adjustment on the ion imbalance may be sufficient, and the microcontroller 201 may adjust the repetition rates 813 and 812 to Achieve ion balance.

If the ion imbalance (which is reflected in the equilibrium current value 252) is significantly different from the set point 253, a large adjustment in the ion imbalance may be sufficient, and the microcontroller 201 may add positive and / or negative pulses, respectively To outputs 815 and 816.

In yet another embodiment of the present invention, the duration (pulse width) of the micropulses of at least one polarity in FIG. 8 is at least about 100 times shorter than the time interval between the micropulses.

In yet another embodiment of the present invention, the micropulses in FIG. 8 are arranged in groups / pulse trains one after the other, and the pulse trains of one polarity include between about 2 and 16 positive ionization pulses The negative pulse train includes between about 2 and 16 positive ionization pulses, where the time interval between the positive pulse train and the negative pulse train is approximately equal to twice the period of consecutive pulses.

The flowchart in FIG. 3 illustrates a feedback algorithm 300 of a system 200 according to an embodiment of the invention. The function of providing ion balance control by using the feedback algorithm 300 operates at the end of the ionization cycle. This algorithm is executed, for example, by the system 200 in FIG. 2. In block 301, a balance control feedback algorithm is initiated.

In blocks 302, 303, 304, and 305, the calculation of the control value of the negative pulse width is performed. In block 302, an error value is calculated by subtracting the required ion balance (SetPoint) from the measured ion balance (BalanceMeasurement). In block 303, the error value is multiplied by the loop gain. In block 304, the calculation of the control value is limited to the minimum or maximum value such that the control value is limited and will not exceed the range. In block 305, the control value is added to the last negative pulse width value.

In blocks 306, 307, 308, and 309, the pulse width is increased or decreased. In block 306, the negative pulse width is compared to a maximum value (MAX). If the negative pulse width is equal to MAX, then in block 307, the positive pulse width is decremented and the algorithm 300 proceeds to block 310. If the negative pulse width is not equal to MAX, the algorithm 300 proceeds to block 308.

In block 308, the negative pulse width is compared to a minimum value (MIN). If the negative pulse width is equal to MIN, then in block 309, the positive pulse width is decremented and the algorithm 300 proceeds to block 310. If the negative pulse width is not equal to MIN, the algorithm 300 proceeds to block 310. When a negative pulse width hits its control limit, a change in the positive pulse width will offset the balance in a way that overshoot balances the setpoint and forces the negative pulse to its limit.

In blocks 310, 311, 312, and 313, the pulse repetition rate (Rep-Rate) is incremented or decremented when the pulse width limit is met. In block 310, the positive pulse width is compared to MAX and the negative pulse width is compared to MIN. If the positive pulse width is equal to MAX and the negative pulse width is equal to MIN, then in block 311, the positive pulse repetition rate (Rep-Rate) is incremented or the negative pulse repetition rate is decremented alternately. The algorithm 300 proceeds to block 314. If the positive pulse width is not equal to MAX and the negative pulse width is not equal to MIN, the algorithm 300 proceeds to block 312.

In block 312, the positive pulse width is compared to MIN and the negative pulse width is compared to MAX. If the positive pulse width is equal to MIN and the negative pulse width is equal to MAX, then in block 313, the positive pulse repetition rate (Rep-Rate) is decremented or the negative pulse repetition rate is incremented alternately. The algorithm 300 proceeds to block 314. If the positive pulse width is not equal to MIN and the negative pulse width is not equal to MAX, the algorithm 300 proceeds to block 314.

Use positive and negative pulse width control when the balance is close to the set point. As the emission point ages or as the environment tends, positive and negative pulse width control will not have this range and will "hit" its control limit (positive is at its maximum and negative is at its minimum (and vice versa) ))). When this happens, the algorithm changes the positive or negative repetition rate, effectively increasing or decreasing the amount of working time generated by positive or negative ions and shifting the balance towards the set point.

In blocks 314, 315, 316, and 317, the pulse repetition rate (Rep-Rate) is incremented or decremented when the pulse width limit is met. In block 314, the positive pulse repetition rate is compared with a minimum pulse repetition rate value (MIN-Rep-Rate), and the negative pulse repetition rate is compared with a maximum pulse repetition rate value (MAX-Rep-Rate). If the positive pulse repetition rate is equal to MIN-Rep-Rate and the negative pulse repetition rate is equal to MAX-Rep-Rate, then in block 315, a negative pulse is shifted into a positive pulse via the offtime count, and the algorithm is 300 then proceeds to block 318, during which the balance control feedback algorithm 300 ends. The stop time count value is when the ionization waveform stops. The stop time is the time between negative and positive and positive and negative pulse groups (or pulse trains), and is defined herein as a count value that is equal to the duration of a pulse with a positive or negative repetition rate.

If the positive pulse repetition rate is not equal to MIN-Rep-Rate and the negative pulse repetition rate is not equal to MAX-Rep-Rate, the algorithm 300 proceeds to block 316.

In block 316, the positive pulse repetition rate is compared to the MAX-Rep-Rate, and the negative pulse repetition rate is compared to the MIN-Rep-Rate. If the positive pulse repetition rate is equal to MAX-Rep-Rate and the negative pulse repetition rate is equal to MIN-Rep-Rate, then in block 317, a positive pulse is shifted to a negative pulse via the stop time count value, and the algorithm 300 then continues Proceeding to block 318, during which the balance control feedback algorithm 300 ends. If the positive pulse repetition rate is not equal to MAX-Rep-Rate and the negative pulse repetition rate is not equal to MIN-Rep-Rate, the algorithm 300 continues to block 318, during which the algorithm 300 ends.

When the repetition rate control hits the limit, the algorithm triggers the next adjustment control level.

The behavior of shifting micropulses from a positive pulse group to a stop time pulse group to a negative pulse group is balanced with a negative direction shift. Conversely, the behavior of shifting micropulses from a negative pulse group to a stop time pulse group to a positive pulse group is balanced with a positive direction shift. Groups using stop times reduce the effect and therefore provide finer control.

The flowchart in FIG. 4 illustrates a micropulse generator control algorithm 400. The waveforms of the drive pulse and high-voltage output are shown in the diagram of FIG. 8. This algorithm 400 is, for example, executed by the system 200 in FIG. 2. In block 401, an interrupt service routine for Timer1 is initiated. The algorithm 400 for a micro-pulse generator runs, for example, every 0.1 milliseconds.

In block 402, the micropulse repetition rate counter is decremented. This counter is a divider counter for the repetition rate of Timer1. Timer1 is the main loop timer and the pulse control timer runs at 0.1 ms. Timer1 turns on the HVPS output, so the micropulse starts, and Timer0 turns off the HVPS and ends the micropulse. Therefore, Timer1 sets the repetition rate and triggers analog-to-digital conversion, and Timer0 sets the micropulse width.

In block 403, a comparison is performed as to whether the micropulse repetition rate counter is equal to two. In other words, a test is performed to determine whether the repetition rate division count value is 2 from the start of the next micropulse. The steps in block 403 will synchronize the ADC (in microcontroller 201) with the time just before the next micropulse transmission. If the micropulse repetition rate counter is equal to 2, the sample-and-hold circuit 205 is set to the sampling mode, as shown in block 404. In block 405, the ACD in the microcontroller 201 reads the sensor input signal from the sample-and-hold circuit 205.

If the micropulse repetition rate counter is not equal to two, the algorithm 400 proceeds to block 406.

Blocks 404 and 405 are activated and perform analog-to-digital conversion to allow the microcontroller 201 to measure the analog input received from the sample-and-hold circuit 205.

When the sample-and-hold circuit 205 is enabled (generally about 0.2 milliseconds before the next micropulse occurs at block 403, where micropulses 803 and 804 have pulse widths 810 and 811, respectively), the signal 250 (Figure 2) is then The input applied to the analog-to-digital converter (ACD) located in the microcontroller 201 is adjusted by the low-pass filter 206 and amplified by the amplifier 207. Just after the sample-and-hold circuit 205 is enabled (block 404), the sample-and-hold operation is signaled to the ACD to begin conversion (block 405). The resulting balanced signal sampling rate is generally about 1.0 milliseconds, and is synchronized with the micro-pulse repetition rate (rep-rate). However, the actual sampling rate varies with the repetition rates 812, 813 (Figure 8) (as shown in blocks 310, 311, 312, 313), but will always remain synchronized with the micropulse repetition rates 812, 813.

According to this embodiment, the method of signal sampling before the next micropulse allows the system 200 to ignore noise and current surges (capacitive coupling) and advantageously avoid making the ion balance measurement unreliable.

In block 406, a test is performed to determine if Timer1's repetition rate split counter is ready to start the next micropulse. Performs a comparison of whether the micropulse repetition rate counter is equal to zero. If the micropulse repetition rate counter is not equal to zero, the algorithm 400 proceeds to block 412. If the micropulse repetition rate counter is equal to zero, the algorithm 400 proceeds to block 417.

In block 417, the micropulse repetition rate counter is reloaded from the data register. This will reload the time interval used to start the next pulse (micropulse). Algorithm 400 then proceeds to block 408.

Blocks 408, 409, and 410 provide the following steps: determine whether a new pulse phase is started or continues the current pulse phase.

In block 408, a comparison is performed whether the micropulse counter is equal to zero (0).

If so, the algorithm 400 continues to block 410, the block calls the next pulse phase, and the algorithm 400 continues to block 411.

If not, the algorithm 400 proceeds to block 409, which calls to continue the current pulse phase.

In block 411, Timer0 (micropulse width counter) is started. Timer0 controls the micropulse width, as discussed below with reference to blocks 414-417.

In block 412, all system interrupts are enabled. At block 413, the interrupt service routine for Timer1 ends.

When the time of Timer0 expires, the actual micropulse width is controlled based on blocks 414-417. At block 414, an interrupt service routine for Timer0 is initiated. In block 415, the positive micropulse drive is set to off (ie, the positive micropulse is turned off). In block 416, the negative micropulse drive is set to off (ie, the negative micropulse is turned off). At block 417, the interrupt service routine for Timer0 ends.

As also shown in part 450 in FIG. 400, for the micropulse driving signal 452, the duration of Timer0 is equal to the micropulse width 454 of the micropulse driving signal 452. The micro-pulse width 454 starts at a pulse rising edge 456 (which is triggered when Timer0 starts) and ends at a pulse falling edge 458 (which is triggered when Timer0 ends).

Details of a method 700 of averaging ion balance sensor inputs are shown in the flowchart in FIG. 7. Blocks 701-706 describe the operation of the sample-and-hold circuit 205 and the operation of ADC conversion of the data from the sample-and-hold circuit 205. At the end of the ADC conversion 701, the sample-and-hold block 205 is disabled after about 0.1 milliseconds, and the noise and current surge are prevented from making the balance measurement unreliable. The resulting measurement result 703 and the sampling counter 705 are added to the previous original measurement sum 704 value and saved, waiting for further processing. Blocks 707-716 are averaging routines used to average the measurement results of sensors 101 and / or 204, and obtain the average value of the ion balance measurement, and then use the finite impulse response calculation to combine the average value of the balance measurement The final balance measurement result used in the balance control loop is generated by combining the average of the balance measurement with the previous measurement result 714. The calculation in block 714 calculates a weighted average from the previous series of sensor input measurements. In block 715, the call event routine adjusts ion generation based on the calculation in block 714.

The flowcharts in FIGS. 5A, 5B, and 6 illustrate system operation during the formation of negative and positive pulse trains. The ionization cycle 531 includes a series of positive pulses 502, 602, followed by stop time intervals 503, 603, followed by a series of negative pulses 517, 604, followed by stop time intervals 518, 605. When the specified number of ionization cycles has occurred 708, the average value of the ion balance measurement 709 is calculated, and the original measurement sum 710 and the sampling counter values 710 and 711 are cleared.

5A, 5B and 6. The drawings are flowcharts of system operations during the formation of a negative pulse train and a positive pulse train, respectively, according to an embodiment of the present invention. In block 501, a normal start for the next pulse phase of the negative pulse train. Blocks 502-515 describe steps for generating a negative series of pulses and a stop time for the pulse duration. Blocks 517-532 describe steps for generating a positive series of pulses and a stop time for the duration of the pulses. Blocks 601-613 describe steps for generating the next pulse phase or whether to continue the current pulse phase.

The finite impulse response calculation is then used to combine the balance measurement average to combine the balance measurement average with the previous measurement result 714 to produce the final balance measurement result used in the balance control loop.

The balance control loop 301 compares the balance measurement result with the set value 302 to generate an error value. The error signal is multiplied by the loop gain 303, checked for over / under range 304, and added to the current negative pulse width value.

In the micro-pulse HV supply systems 202, 203, the pulse width of the driving micro-pulses changes the peak amplitude of the high-voltage (HV) waves 814, 801, 802 caused. In this case, the amplitude of the negative pulse is changed for the change in ion balance to take effect. If the error signal value is greater than zero, the negative pulse width is increased, so that the amplitude of the negative HV pulse is increased, and the balance is changed in the negative direction. Conversely, if the balance is negative, the negative pulse width is turned down, so the balance is changed in the positive direction.

During the continuous adjustment of the negative pulse width and when conditions permit, the negative pulse width may hit its control limit. In this case, decrease the positive pulse width by 307 for positive imbalance or increase the positive pulse width by 309 for negative imbalance until the negative pulse width can resume control again. This method of controlling using negative and positive pulse widths produces an average balance control adjustment range of about 10V, with stability less than 3V.

According to another embodiment under large imbalance conditions (such as when the ionizing blower starts, when a large amount of pollutants accumulates, or when the emitter corrodes as they age), the negative and positive pulse widths will reach their Control limits 310, 312. In this case, adjusting the positive pulse repetition rate 311 and the negative pulse repetition rate 313 so that the balance reaches a positive pulse width and a negative pulse width is again a point within their respective control ranges. Therefore, for large positive imbalance conditions, the negative pulse repetition rate is increased by 313, causing a negative shift in balance. If the condition persists, the positive pulse repetition rate is reduced by 313, which also causes a negative shift in balance. This alternating method of changing the positive / negative repetition rate 313 continues until the negative pulse width and the positive pulse width are again within their control range. Similarly, for large negative imbalance conditions, the positive pulse repetition rate is increased by 311 and the negative pulse repetition rate is alternately decreased by 311, resulting in a positive shift in balance. This continues as before, until the negative and positive pulse widths are again within their control range.

In the presence of extreme imbalance conditions, both the negative / positive pulse width and positive / negative repetition rate adjustments may have hit their respective control limits 310, 312, 314, and 316. The positive pulse count value and Negative pulse counts to bring the balance to a positive / negative repetition rate are again points within their respective control ranges. Therefore, for extreme positive imbalance conditions, the positive pulse count value will decrease by 317 and the stop time pulse count value will increase by one pulse number, causing a negative change in balance.

If the condition still exists, the stop time pulse count value will decrease by 317 and the negative pulse count value will increase by 317 one pulse number, causing a further negative change in balance. This behavior of shifting a pulse from a negative packet / column to a positive packet / column continues until the positive / negative repetition rate is again within their control range. Similarly, for extreme negative imbalance conditions, one pulse at a time will shift one pulse from the positive pulse 315 packets / column through the stop time pulse count value to the negative pulse packet 315, causing a positive change in balance until positive / negative The repetition rate is again within their control range.

In a parallel program, the balance measurement result is compared with the set point. If the balance measurement result is determined to be outside its specified range (corresponding to an average CPM (Charge Plate Monitor) reading of ± 15V measured at 1 foot from the protonizer), the ionizer's The control system will trigger a balance alert.

In FIG. 9 is a method for providing a feedback routine that activates an ion balance alert if an ion imbalance exists. Blocks 901-909 perform measurements that are compared to threshold values to determine if a balance alert is activated. Blocks 910-916 determine whether a balance alert is activated.

In the time interval every 5 seconds, estimate the balance measurement result 903. When it exceeds this range, shift "1" to the left of the warning register 904, otherwise shift "0" to the left of the warning register In 902. When the alert register contains a value of 255 (all "1"), the balance measurement result is announced in the alert. Similarly, if the alert register contains a value of 0 (all "0"), the balance measurement result is not declared in the alert. Any value other than 255 or 0 in the alert register is ignored and the status of the alert is unchanged. This filters out alert notifications and prevents sporadic notifications. As a by-product, the notification delay allows the balance control system sufficient time to recover from external stimuli.

In another balancing program running at the end of each ADC conversion cycle, the balancing control system is monitored approximately every millisecond (Figure 9B). This routine 910 checks the limit conditions 911 and 912 for the positive and negative pulse count values. As described above, when an imbalance condition exists and the positive / negative pulse width and the positive / negative repetition rate are at their respective limits, the positive and negative pulse count values are adjusted. However, when the balance cannot be returned to the specifications and the positive / negative pulse count value has reached their adjustment limits, in the case of 911 and 912, the alarm register is set to a value of 913 which is all "1". A flag 914 and two alert status bits 915 are set to enforce the alert status.

The methods and techniques of automatic balance control discussed above are not limited to one type of ionizing blower. These methods and techniques can be used in ionizing blowers with different models of various emitting electrodes. Other applications for automation systems include models of ionizing rods with micropulsed high-voltage power supplies.

The above description of the illustrated invention embodiments (including those described in the Abstract) is not intended to be exhaustive or to limit the invention to the precise forms disclosed. As those skilled in the relevant art will recognize, although specific embodiments and examples of the invention are described herein for purposes of illustration, various equivalent modifications are possible within the scope of the invention.

These changes can be made to the invention based on the above detailed description. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the description and the claims. Instead, the scope of the present invention should be determined solely by the following claims, and these claims should be interpreted according to the established claim interpretation principles.

100‧‧‧ ionized blower

101‧‧‧air ionization sensor

102‧‧‧ launch point array / launch point

103‧‧‧fan

104‧‧‧Reference electrode

105‧‧‧Reference electrode

106‧‧‧ Protective grille / ventilation

107‧‧‧Control System

108‧‧‧Sensitive electrode

109‧‧‧Thin Dielectric Plate

110‧‧‧ ground flat electrode

125‧‧‧air flow

125a‧‧‧Sample

125b‧‧‧Ionized air stream

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135‧‧‧Voltage / Signal

200‧‧‧ system

201‧‧‧Control System / Microcontroller

202‧‧‧Pulse driver

203‧‧‧Transformer

204‧‧‧Return Current Sensor

205‧‧‧Sample and Hold Circuit

206‧‧‧Low-pass filter

207‧‧‧amplifier

208‧‧‧Balance adjustment potentiometer

209‧‧‧Power Converter

210‧‧‧Return current

214‧‧‧Current

215‧‧‧Sampling signal

216‧‧‧Switch

218‧‧‧amplifier

220‧‧‧ ion current

230‧‧‧HV transformer

250‧‧‧High Voltage Terminal

251‧‧‧Low-voltage terminal

252‧‧‧ balanced signal

253‧‧‧Set point signal

254‧‧‧HV output

256‧‧‧voltage bias

257‧‧‧ route

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400‧‧‧Micro-pulse generator control algorithm

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452‧‧‧Micro-pulse driving signal

454‧‧‧micropulse width

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458‧‧‧pulse falling edge

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801‧‧‧Positive micropulse

802‧‧‧Negative micropulse

803‧‧‧positive pulse

804‧‧‧Negative pulse

810‧‧‧Positive pulse width (duration)

811‧‧‧Negative pulse width (duration)

812‧‧‧Positive repeat rate

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814‧‧‧Ionization waveform

815‧‧‧positive pulse output

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Various embodiments in which this disclosure is proposed as an example will be described in detail with reference to the following drawings, wherein like element symbols refer to like elements, and wherein

FIG. 1A is a block diagram of a general view of an ionizing blower according to an embodiment of the present invention.

FIG. 1B is a cross-sectional view of the blower of FIG. 1A.

FIG. 1C is a block diagram of a sensor included in an ionizing blower according to an embodiment of the present invention.

2A is a block diagram of the ionized blower of FIG. 1A and an ionized air flow from the blower according to an embodiment of the present invention.

2B is an electrical block diagram of a system in an ionizing blower according to an embodiment of the present invention.

FIG. 3 is a flowchart of a feedback algorithm 300 according to an embodiment of the present invention.

4 is a flowchart of a micro-pulse generator algorithm controlled by a micro-pulse generator according to an embodiment of the present invention.

FIG. 5A is a flowchart of system operation during formation of a negative pulse train according to an embodiment of the present invention.

FIG. 5B is a flowchart of system operation during the formation of a positive pulse train according to an embodiment of the present invention.

FIG. 6 is a flowchart of system operation during a current pulse phase according to an embodiment of the present invention.

FIG. 7 is a flowchart of system operation during sensor input measurement according to an embodiment of the present invention.

FIG. 8 is a waveform diagram of micropulses according to an embodiment of the present invention.

FIG. 9 is a flowchart of system operation during a balance alert according to an embodiment of the present invention.

Domestic hosting information (please note in order of hosting institution, date, and number) None

Information on foreign deposits (please note in order of deposit country, institution, date, and number) None

Claims (20)

A device for an automatic balance ionization blower includes: an ion balance control system configured to sample and compare output signals in a time interval between ionization pulses, the output signals coming from a remote ion The ionization current is returned to at least one of the sensor or a remote ionization voltage sensor. The device according to claim 1, wherein the ion balance control system is configured to receive the output signals through a wired connection, the output signals coming from the remote ionization current return sensor or the remote ionization voltage The at least one of the sensors. The device according to claim 1, wherein the ion balance control system is configured to receive the output signals through a wireless connection, the output signals coming from the remote ionization current return sensor or the remote ionization voltage The at least one of the sensors. The device according to claim 3, wherein the at least one of the ion balance control system and the remote ionization current return sensor or the remote ionization voltage sensor is individually connectable through the wireless connection. Addressed. The device of claim 3, wherein the ion balance control system is configured to pair with the at least one of the remote ionization current return sensor or the remote ionization voltage sensor to receive the Output signal. The device according to claim 1, wherein the ion balance control system is further configured to compare the output signals from the remote ionization current return sensor and the remote ionization voltage sensor. A control system of a balanced micro-pulse type ionization blower, the control system includes: a micro-pulse type high-voltage AC (alternating current) power source configured to generate a short-term positive-ionization ionization pulse and a short-term negative electrode Ionization pulse; an ion balance control system configured to receive output signals in a time interval between the ionization pulses, the output signals coming from a remote ionization current return sensor or a remote ion At least one of a voltage sensor; and a microcontroller configured to control the AC power source based on the output signals. The control system according to claim 7, wherein the ion balance control system is configured to receive the output signals through a wired connection, and the output signals come from the remote ionization current return sensor or the remote ionization The at least one of the voltage sensors. The control system according to claim 7, wherein the ion balance control system is configured to receive the output signals through a wireless connection, and the output signals come from the remote ionization current return sensor or the remote ionization The at least one of the voltage sensors. The control system according to claim 9, wherein the at least one of the ion balance control system and the remote ionization current return sensor or the remote ionization voltage sensor is accessible through the wireless connection. Individually addressed. The control system of claim 9, wherein the ion balance control system is configured to pair with at least one of the remote ionization current return sensor or the remote ionization voltage sensor to receive the remote ionization voltage sensor. Wait for the output signal. The control system according to claim 7, wherein the ion balance control system is further configured to compare the output signals from the remote ionization current return sensor and the remote ionization voltage sensor. The control system according to claim 7, wherein the microcontroller achieves an ion balance by at least one of the following steps: increasing and / or decreasing a positive pulse width value and / or a negative pulse of the ionization pulses The width value; increases and / or decreases a time between the positive and / or negative pulses of the ionized pulses; or increases and / or decreases a number of positive and / or negative pulses of the ionized pulses. A method for providing control in a balanced micro-pulse ionization blower, the method comprising the steps of: generating a short-time positive polarity ionization pulse and a short-time negative polarity ionization pulse; generating the ionization pulse The step further includes: receiving an output signal in a time interval between the ionization pulses, the output signal coming from at least one of a remote ionization current return sensor or a remote ionization voltage sensor. Or; and controlling an AC power source for generating the ionization pulses based on the output signals. The method of claim 14, wherein the step of receiving the output signals from the at least one of the remote ionization current return sensor or the remote ionization voltage sensor comprises transmitting through a wire Connect to receive these output signals. The method of claim 14, wherein the step of receiving the output signals from the at least one of the remote ionization current return sensor or the remote ionization voltage sensor comprises transmitting through a wireless Connect to receive these output signals. The method of claim 16, wherein the at least one of the remote ionization current return sensor or the remote ionization voltage sensor is individually addressable through the wireless connection. The method according to claim 16, further comprising the steps of: establishing a pairing with the at least one of the remote ionization current return sensor or the remote ionization voltage sensor to receive the output signals. The method according to claim 14, further comprising the step of comparing the output signals from the remote ionization current return sensor and the remote ionization voltage sensor. The method according to claim 14, further comprising the steps of: achieving an ion balance based on controlling at least one of the following steps: increasing and / or decreasing a positive pulse width value and / or a negative pulse width of the ionization pulses. Value; increase and / or decrease a time between positive and / or negative pulses of the ionization pulses; or increase and / or decrease a number of positive and / or negative pulses of the ionization pulses.