阅读说明：本技术 一种电晕机谐振频率自动调试方法 (Method for automatically debugging resonance frequency of corona machine ) 是由 陈大龙 陈伟 陆金华 于 2021-09-08 设计创作，主要内容包括：本发明涉及一种电晕机谐振频率自动调试方法,步骤为,S1、设置初始频率以及固定的占空比；S2、电晕机以当前频率以及占空比输出设定时间,待机器稳定；S3、计算当前有效功率值；S4、将当前有效功率值与前次有效功率值进行对比,判断当前有效功率值是否大于或等于前次有效功率值,若是则进入步骤S5,若否则进入步骤S6；S5、将当前频率按照单次变化量进行单方向变化,返回步骤S2循环；S6、将当前频率进行处理得到谐振频率并保存至电晕机内。通过该方法对谐振频率进行调试,使得电晕机工作状态发生变化之后可以迅速找到谐振频率,并长时间工作在谐振频率点(或附近),能使得机器始终维持在最佳的工作点,稳定性大大提高。(The invention relates to an automatic debugging method of resonance frequency of a corona machine, comprising the steps of S1, setting initial frequency and fixed duty ratio; s2, outputting the set time by the corona machine according to the current frequency and the duty ratio, and stabilizing the standby device; s3, calculating the current effective power value; s4, comparing the current effective power value with the previous effective power value, judging whether the current effective power value is larger than or equal to the previous effective power value, if so, entering a step S5, otherwise, entering a step S6; s5, changing the current frequency in a single direction according to the single variable quantity, and returning to the step S2 for circulation; and S6, processing the current frequency to obtain a resonance frequency and storing the resonance frequency in the corona machine. The method is used for debugging the resonant frequency, so that the resonant frequency can be quickly found after the working state of the corona machine is changed, the corona machine can work at (or near) the resonant frequency point for a long time, the machine can be always maintained at the optimal working point, and the stability is greatly improved.)

1. A method for automatically debugging the resonance frequency of a corona machine is characterized by comprising the following steps,

s1, setting an initial frequency and a fixed duty ratio;

s2, outputting the set time by the corona machine according to the current frequency and the duty ratio, and stabilizing the standby device;

s3, calculating the current effective power value;

s4, comparing the current effective power value with the previous effective power value, judging whether the current effective power value is larger than or equal to the previous effective power value, if so, entering a step S5, otherwise, entering a step S6;

s5, changing the current frequency in a single direction according to the single variable quantity, and returning to the step S2 for circulation;

and S6, processing the current frequency to obtain a resonance frequency and storing the resonance frequency in the corona machine.

2. The method according to claim 1, wherein the current frequency is varied from large to small.

3. The method according to claim 1, wherein the current frequency is varied from small to large.

4. The method according to claim 1, wherein the current effective Power value Power in step S3 is calculated by obtaining a voltage value Vdc and a current value Idc of the corona bus, and the current effective Power value Power is Vdc ═ Idc.

5. The method for automatically debugging the resonance frequency of a corona machine according to claim 1, wherein the initial frequency is in a range of 5KHz to 100 KHz.

6. The method for automatically debugging the resonance frequency of a corona machine according to claim 1, wherein the single variation is in a range of 0.01KHz to 2 KHz.

7. The method as claimed in claim 1, wherein the setting time of step S2 is in the range of 100 us-10S.

8. The method for automatically tuning the resonance frequency of a corona machine according to claim 1, wherein the resonance frequency is obtained in step S6 by selecting a previous frequency as the resonance frequency.

9. The method as claimed in claim 1, wherein the resonance frequency is obtained by averaging the current frequency with the previous frequency in step S6.

Technical Field

The invention relates to the technical field of corona machines, in particular to an automatic debugging method for resonance frequency of a corona machine.

Background

Corona treatment is an electric shock treatment which gives higher adhesion to the surface of the substrate. The principle is that corona discharge (high-frequency alternating current voltage up to 5000-. The surface is roughened and the wettability to polar solvent is increased, the molecular structure of the plasma is damaged by electric shock and penetration into the surface of the printed body, the treated surface molecules are oxidized and polarized, and the ion electric shock erodes the surface, so that the adhesion capability of the surface of the printed material is increased.

The traditional corona machine usually adopts one or a combination of PFM, PAM and PWM. However, in a working site, a load gap is changed, the temperature and humidity of a discharge area are changed frequently, the thickness or material of a processed material is changed frequently, the size of a discharge frame needs to be adjusted again, or parameters of circuit components drift, all of the factors can cause that the output characteristic of the corona machine and the circuit characteristic of the load cannot be optimally matched, so that the corona effect is influenced, even the machine is damaged, at present, an enterprise needs to find and adjust the resonant frequency, and needs to debug the equipment provider on site or return to a manufacturer for debugging, so that the machine cost is greatly increased.

Disclosure of Invention

The invention aims to provide an automatic debugging method of resonance frequency of a corona machine, which can be conveniently adjusted and enables the machine to be in the optimal working state.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for automatically debugging the resonance frequency of a corona machine comprises the following steps,

s1, setting an initial frequency and a fixed duty ratio;

s2, outputting the set time by the corona machine according to the current frequency and the duty ratio, and stabilizing the standby device;

s3, calculating the current effective power value;

s4, comparing the current effective power value with the previous effective power value, judging whether the current effective power value is larger than or equal to the previous effective power value, if so, entering a step S5, otherwise, entering a step S6;

s5, changing the current frequency in a single direction according to the single variable quantity, and returning to the step S2 for circulation;

and S6, processing the current frequency to obtain a resonance frequency and storing the resonance frequency in the corona machine.

More specifically, the current frequency changes from large to small.

More specifically, the current frequency changes from small to large.

More specifically, the current effective Power value Power in step S3 is calculated by obtaining a voltage value Vdc and a current value Idc of the corona bus, where the current effective Power value Power is Vdc × Idc.

More specifically, the initial frequency ranges from 5KHz to 100 KHz.

More specifically, the range of the single variation is 0.01KHz to 2 KHz.

More specifically, the setting time of step S2 is in the range of 100us to 10S.

More specifically, the method for acquiring the resonant frequency in step S6 is to select the previous frequency as the resonant frequency.

More specifically, the method for acquiring the resonant frequency in step S6 is to obtain the resonant frequency by averaging the current frequency and the previous frequency.

The invention has the beneficial effects that: after the working state of the corona machine changes, the resonance frequency is debugged by the method, so that the resonance frequency can be quickly found after the working state of the corona machine changes, the corona machine can work at (or near) the resonance frequency point for a long time, the machine can be always maintained at the best working point, the stability is greatly improved, the debugging can be carried out without professional skills, a novice can also easily debug, the machine cost of an enterprise is reduced, and the method is convenient and fast.

Drawings

FIG. 1 is a schematic diagram of a corona machine active power dynamic balancing system of the present invention;

FIG. 2 is a flow chart of a control method for dynamic balancing of corona machine active power in accordance with the present invention;

FIG. 3 is a logic diagram controlled by software in accordance with the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, a corona machine system includes a circuit module located on a corona machine, and a control module for outputting a control signal to the circuit module, wherein the circuit module includes a rectification circuit, a filter circuit, an inversion unit, a transformer, and a discharge load, a single-phase or three-phase ac power is connected to the rectification circuit to convert the ac power into a dc power and input the dc power to the filter circuit, and then the dc power is supplied to the discharge load through the inversion unit and the transformer to perform corona operation, and the corona machine system further includes a driving circuit for sending voltage and current signals to the inversion unit; the control module comprises a controller unit, a display unit, an input unit, an alarm unit, a remote interface and a corresponding signal feedback unit, wherein the display unit, the input unit, the alarm unit, the remote interface and the corresponding signal feedback unit are connected with the controller unit, the input unit is used for inputting corresponding parameters and starting or stopping signals into the controller unit, the display unit displays the working state of the corona machine to an operator through a display screen, the signal feedback unit receives the actual working state of the corona machine and displays the working state through the display unit and alarms through the alarm unit, and the remote interface can realize remote control input and other operations through a network.

Based on the system, in order to ensure that the changed resonant frequency can be found as soon as possible after the working state is changed, a voltage sensor and a current sensor are arranged on the corona bus, the voltage sensor acquires a voltage signal of the corona bus, the current sensor acquires a current signal of the corona bus, the voltage signal and the current signal are transmitted to the controller unit and processed in the controller unit, and the processed resonant frequency is stored in the read-only memory.

The controller unit adopts a singlechip, a DSP chip, a CPLD chip or an FPGA chip.

Based on the above system, an automatic debugging method for the resonance frequency of a corona machine is provided, the effective power value will become larger and smaller along with the unidirectional increase or decrease of the frequency, the frequency at the turning point is the optimal resonance frequency, as shown in FIG. 2,

s1, setting an initial frequency and a fixed duty ratio, wherein the initial frequency can be set in two modes, the first initial frequency is set to be a higher value in the range of 20KHz-100KHz, and the current frequency is changed from large to small; setting a lower value of the second initial frequency, wherein the range of the second initial frequency is 5KHz-20KHz, and the current frequency is changed from small to large; the duty ratio is set to a corresponding fixed value according to needs, and the duty ratio is 0.4 in the scheme.

S2, outputting a set time by the corona machine according to the current frequency and the duty ratio, wherein the set time is a shorter time, the set time range is 100us-10S, the set time is 1S according to the characteristics of the corona machine, and the main purpose is that the standby machine operates stably;

s3, calculating the current effective Power value, wherein the calculation mode of the current effective Power value Power is to obtain the voltage value Vdc and the current value Idc of the corona bus, and the current effective Power value Power is Vdc × Idc;

s4, comparing the current effective power value with the previous effective power value, judging whether the current effective power value is larger than or equal to the previous effective power value, if so, entering a step S5, otherwise, entering a step S6;

s5, changing the current frequency in a single direction according to the single variable quantity, and returning to the step S2 for circulation; if the initial frequency is set to a higher value, the current frequency changes from large to small, namely the current frequency is reduced by a single variable quantity; if the initial frequency is set to a lower value, the current frequency is changed from small to large, that is, the current frequency is increased by a single variation, and the single variation ranges from 0.01KHz to 2KHz, and preferably ranges from 0.1 KHz.

S6, processing the current frequency to obtain a resonant frequency and storing the resonant frequency in the corona machine; the resonant frequency may be obtained in various ways, and the main purpose of the method is to approach the optimal resonant frequency as much as possible, and may select the current frequency as the resonant frequency, or may select the previous frequency as the resonant frequency, or may average the current frequency and the previous frequency as the resonant frequency.

Based on the above system and method, the automatic debugging is realized by software, as shown in fig. 3, the specific embodiment is as follows:

firstly, starting a corona machine, and initializing a software program;

secondly, judging whether a debugging instruction is started (controlled by a set button), if so, entering a third step to start debugging, and if not, entering a normal working process of the corona machine;

thirdly, two Power value variables Power0 and Power1 are initialized in the controller unit, 0 is assigned to Power0 and Power1 respectively, namely Power0 is equal to 0, Power1 is equal to 0, a fixed duty ratio Q is assigned to Dout, namely Dout is equal to Q, and an initial frequency constant F0 is assigned to Fout, namely Fout is equal to F0, wherein the initial frequency constant is a larger value;

fourthly, the controller unit outputs a driving pulse signal for driving the corona machine to operate according to the Fout and the Dout;

fifthly, the corona machine operates for a short time, so as to wait for the output state of the corona machine to be stable;

sixthly, the voltage sensor acquires the voltage value of the corona bus and converts the analog signal into a digital signal to the controller unit through the digital-to-analog conversion circuit, and the current sensor acquires the current value of the corona bus and converts the analog signal into the digital signal to the controller unit through the digital-to-analog conversion circuit;

seventhly, calculating the obtained voltage value Vdc and current value Idc by the controller unit according to a formula Power ═ Vdc Idc to obtain effective Power under the current frequency, assigning the effective Power to Power1, and assigning the effective Power under the previous frequency to Power 0;

eighthly, comparing Power0 with Power1, judging whether Power1 is larger than or equal to Power0, if so, indicating that the effective Power is still in an ascending stage and does not reach the maximum value, entering a ninth step to adjust the current frequency, if not, indicating that the effective Power reaches the maximum value and starting entering a descending stage, and entering a tenth step to search a frequency value close to the maximum effective Power as a resonant frequency;

a ninth STEP of subtracting a single STEP change F _ STEP from the current frequency, assigning the obtained frequency value to Fout, and then returning to the fourth STEP of the walking cycle; specifically, when the current frequency is adjusted in the first cycle, Fout is F0-F _ STEP, when the current frequency is adjusted in the second cycle, Fout is F0-F _ STEP (Fout is F0-2F _ STEP), and when Fout is F0-3F _ STEP in the third cycle, and so on, Fout is Fout-F _ STEP;

step ten, the previous frequency is taken as the resonant frequency and stored in a read-only memory ROM in the corona machine; specifically, in the controller unit, the current frequency needs to be changed to the previous frequency, that is, F _ RES is Fout + F _ STEP, and the assigned F _ RES is stored in the read only memory.

At the moment, the debugging process is finished, the resonant frequency after the parameters of the corona machine are changed is found, and the resonant frequency can be directly adjusted and output when the corona machine works normally.

After the setting button takes effect, the corona machine sends out a pulse signal according to a higher initial frequency, the controller unit calculates the current value and the voltage value of a corona machine bus obtained by sampling through an analog-to-digital conversion circuit in the controller unit to obtain the effective power under the current frequency, then the controller unit reduces the output frequency according to a certain step length, simultaneously the controller unit calculates the current effective power, the output power is gradually increased along with the reduction of the frequency, after the certain effective power is reached, the effective power starts to be reduced, the controller unit records the frequency corresponding to the highest point, and the frequency is the optimal resonance frequency of the discharge system. The corona machine operates at (or near) the optimum resonant frequency to achieve maximum output efficiency.

When the parameters of the discharging load are changed, the machine automatically enters a debugging state as long as the setting button is pressed, and after about one minute, the machine automatically finds the optimal output working point and stores the optimal parameters in the read-only memory. Therefore, the machine can be ensured to be in the best working condition, the failure rate of the machine is greatly reduced, and the stable performance of the machine is ensured.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.