CN-121299383-B - Corona discharge load state detection method based on voltage ratio relation of oscillating circuit

CN121299383BCN 121299383 BCN121299383 BCN 121299383BCN-121299383-B

Abstract

The invention discloses a corona discharge load state detection method based on an oscillating circuit voltage ratio relation, and relates to the technical field of corona discharge detection; the method comprises the steps of constructing an ideal Royer circuit, a peak protection circuit used for collecting peak voltage Vm, a sine wave self-oscillation boosting circuit with direct current input voltage Vin, calculating the ratio relation of Vm and Vin in the ideal Royer circuit under no load to obtain a first relation, calculating the ratio relation of Vm and Vin in the ideal Royer circuit under load to obtain a second relation, performing first-order linear approximate fitting on the first relation and the second relation to obtain a target relation, and determining the corona discharge load state according to the target relation. By establishing a quantitative relation between the ratio of the peak voltage which is easy to measure on the primary side of the Royer circuit and the input voltage and the secondary direct-current high voltage and load current which reflect the state of the needle point, the safe, quantitative and self-adaptive pollution degree detection is realized.

Inventors

ZHOU HONGSHUANG
GAN SHUISHENG
HE QIANG
ZHOU ZHIBO

Assignees

广东联锐达科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251205

Claims (4)

1. A corona discharge load state detection method based on an oscillating circuit voltage ratio relationship, the method comprising: The method comprises the steps of constructing an ideal Royer circuit, wherein the ideal Royer circuit comprises a peak protection circuit and a sine wave self-oscillation boosting circuit, the peak protection circuit is used for collecting peak voltage Vm, and the direct current input voltage of the sine wave self-oscillation boosting circuit is Vin; calculating the ratio relation of Vm and Vin in the ideal Royer circuit under no-load to obtain a first relation; Calculating the ratio relation of Vm and Vin in the ideal Royer circuit under load to obtain a second relation; Performing first-order linear approximate fitting on the first relation and the second relation to obtain a target relation; Determining a corona discharge load state according to the target relation; the sine wave self-oscillation boosting circuit comprises a first capacitor C1, a choke inductance L1, a transformer TR1, a second capacitor C2, a third resistor R3, a fourth resistor R4, a rectifying circuit, a load resistor RL, a first triode T1 and a second triode T2, wherein the transformer TR1 comprises a primary winding, a first secondary winding and a second secondary winding; one end of the first capacitor C1 is grounded, and the other end of the first capacitor C1 is connected with one end of the choke inductor L1; The other end of the choke inductance L1 is connected with a center shaft head c point in a primary winding of the transformer TR 1; The point a in the primary winding of the transformer TR1 is respectively connected with one end of the second capacitor C2 and the collector electrode of the first triode T1, and the point a in the primary winding is also connected with the anode of the first unidirectional conducting diode D1 in the peak protection circuit; the point b in the primary winding of the transformer TR1 is respectively connected with the other end of the second capacitor C2 and the collector electrode of the second triode T2, and the point b in the primary winding is also connected with the anode of the second unidirectional conducting diode D2 in the peak protection circuit; The emitters of the first triode T1 and the second triode T2 are respectively grounded; The base electrode of the first triode T1 is respectively connected with one end of the second secondary winding and one end of the fourth resistor R4; The base electrode of the second triode T2 is respectively connected with the other end of the second secondary winding and one end of the third resistor R3; The other end of the third resistor R3 is connected with the other end of the fourth resistor R4; The two ends of the first secondary winding are respectively connected with the AC end of the rectifying circuit, and the rectifying circuit is also connected with the load resistor RL; Calculating the ratio relationship between Vm and Vin in the ideal Royer circuit under no-load to obtain a first relationship comprises: obtaining the voltage at two ends of the choke inductance L1 to obtain a first voltage difference; Applying a volt-second principle to the first voltage difference in a preset steady-state working period T to obtain a first conclusion, wherein the first conclusion is that the average value Vc and avg of the voltage at the central spindle nose c are equal to the direct-current input voltage Vin; the method comprises the steps of obtaining a voltage waveform at a central spindle nose c in a preset steady-state working period T to obtain a full-wave rectification sine wave, wherein the voltage at the central spindle nose c is a midpoint voltage absolute value of a point a in a primary winding and a point b in the primary winding, and the amplitude is Vm/2; Determining the average value Vc and avg of the voltage at the central spindle head c according to the full-wave rectification sine wave to obtain a second conclusion, wherein the second conclusion is that the average value Vc and avg of the voltage at the central spindle head c is equal to 1/pi of the peak voltage Vm; Combining the first conclusion with the second conclusion to obtain a first relation; calculating the ratio relation between Vm and Vin in the ideal Royer circuit under load to obtain a second relation comprises: Calculating a power conservation equation of the ideal Royer circuit according to Vin to obtain a first equation; determining a relation equation between Vm and the first secondary winding voltage to obtain a second equation; obtaining a maintenance current in the ideal Royer circuit under no-load to obtain no-load current; constructing a relation equation between the no-load current and a target output current to obtain a third relation, wherein the target output current is the current Iout between the rectifying circuit and the load resistor RL; simultaneous equation solving is carried out on the first equation, the second equation and the third equation to obtain a second relation; Performing first-order linear approximate fitting on the first relation and the second relation to obtain a target relation comprises: Performing first-order linear approximate fitting on the first relation and the second relation to obtain a target relation ; Defining circuit efficiency as eta, and obtaining a first equation according to a power conservation equation Wherein Iin is the total average current flowing into the central spindle nose, vout_dc is the direct-current high voltage of the secondary rectification output, and Iout is the secondary direct-current load current; Defining the transformer ratio n and the peak value of the secondary alternating voltage as n.vm, and fitting the peak values of the direct-current high voltage and the secondary alternating voltage output after full-wave rectification into a second equation ; By the formula Constructing a relation equation between the no-load current and the target output current to obtain a third equation, wherein Iq is no-load maintaining current, and beta is a current proportionality coefficient; Substituting the second equation into the first equation Cheng Dedao Solving Iin to obtain a fourth equation ; So that the third equation and the fourth equation Cheng Xiangdeng yield a second fusion equation Solving the ratio of Vm to Vin to obtain a second relation 。
2. The method for detecting a corona discharge load state based on the voltage ratio relation of an oscillating circuit according to claim 1, wherein the peak protection circuit comprises a first unidirectional conducting diode D1, a second unidirectional conducting diode D2, a first resistor R1, a second resistor R2 and a third capacitor C3; the cathode of the first unidirectional conductive diode D1, the cathode of the second unidirectional conductive diode D2 and one end of the first resistor R1 are connected; The other end of the first resistor R1 is respectively connected with one end of the second resistor R2 and one end of the third capacitor C3; the other end of the second resistor R2 is connected with the other end of the third capacitor C3 and then grounded.
3. The method for detecting the corona discharge load state based on the voltage ratio relation of the oscillating circuit according to claim 2, wherein the voltage at the junction of the first resistor R1, the second resistor R2 and the third capacitor C3 is collected as the peak voltage Vm.
4. The method of claim 1, wherein determining the average value Vc, avg of the voltages at the center tap c according to the full-wave rectified sine wave to obtain the second conclusion comprises: Obtaining the expression of the average value Vc and avg of the voltage at the central spindle nose c according to the full-wave rectification sine wave ; Integrating the expression to obtain And is noted as a second conclusion.

Description

Corona discharge load state detection method based on voltage ratio relation of oscillating circuit Technical Field The invention belongs to the technical field of corona discharge detection, and particularly relates to a corona discharge load state detection method based on an oscillating circuit voltage ratio relation. Background The corona discharge is a phenomenon that a gas medium is partially ionized and self-sustained discharge is generated under the action of a strong electric field, and has irreplaceable application value in the industrial field, a large amount of positive and negative ions generated by the corona discharge can effectively neutralize electrostatic charges on the surface of a workpiece in the electrostatic neutralization field to avoid the problems of electrostatic adsorption of dust, electrostatic breakdown of electronic elements and the like, the corona discharge can excite active substances such as ozone, hydroxyl free radicals and the like in the air purification field to realize degradation and sterilization and disinfection of harmful gases, and the corona discharge can modify the surface of a material in the material treatment field to improve the properties such as hydrophilicity, adhesive force and the like. However, the degree of pollution of the discharge needle tip of the electrostatic neutralizer in the corona discharge device directly affects the intensity and stability of the corona discharge, thereby causing the performance of the device to be reduced, the energy consumption to be increased, and even causing production accidents. In order to ensure the stable operation of corona discharge equipment, the detection of the pollution degree of the discharge needle point of the electrostatic neutralizer is important. At present, the existing detection method has a plurality of limitations: The direct high-voltage measuring method is characterized in that a current sensor is needed to be connected in series or a voltage sensor is needed to be connected in parallel in a secondary high-voltage loop to measure load current or voltage, the method has the safety risk of high-voltage electric shock, and the measuring equipment has high-voltage resistance, so that the hardware cost is high, the circuit design is complex, and meanwhile, the measuring precision is seriously influenced by electromagnetic interference in a high-voltage environment. The manual visual assessment method is that an operator is relied on to judge the load state by visually observing the appearance of the discharge needle point and the intensity of corona glow. The method is extremely high in subjectivity, the judgment results of different operators are large in difference, quantitative monitoring cannot be realized, and early warning cannot be performed in time when the load state is slightly deteriorated. The method is characterized by comprising the steps of periodically disassembling corona discharge equipment, and performing off-line detection on discharge needle points, such as microscopic observation of pollution degree, resistance test and the like, so that the method is time-consuming and labor-consuming, affects production efficiency, and belongs to post detection, and the change of a load state cannot be found in real time in the running process of the equipment. Therefore, the traditional method cannot quantitatively and adaptively detect the pollution degree of the discharge needle point of the electrostatic neutralizer. Disclosure of Invention The invention aims to solve the problem that the traditional method can not quantitatively and adaptively detect the pollution degree of the discharge needle point of the electrostatic neutralizer, and provides a corona discharge load state detection method based on the voltage ratio relation of an oscillating circuit. The invention provides a corona discharge load state detection method based on an oscillating circuit voltage ratio relation, which comprises the following steps: The method comprises the steps of constructing an ideal Royer circuit, wherein the ideal Royer circuit comprises a peak protection circuit and a sine wave self-oscillation boosting circuit, the peak protection circuit is used for collecting peak voltage Vm, and the direct current input voltage of the sine wave self-oscillation boosting circuit is Vin; calculating the ratio relation of Vm and Vin in the ideal Royer circuit under no-load to obtain a first relation; Calculating the ratio relation of Vm and Vin in the ideal Royer circuit under load to obtain a second relation; Performing first-order linear approximate fitting on the first relation and the second relation to obtain a target relation; and determining a corona discharge load state according to the target relation. Optionally, the peak protection circuit includes a first unidirectional conductive diode D1, a second unidirectional conductive diode D2, a first resistor R1, a second resistor R2, and a third capacitor C3; t