A method, system, device and storage medium for controlling the waveform of a piezoelectric nozzle.

Abstract

This invention relates to the field of inkjet printing technology. It discloses a method, system, device, and storage medium for controlling a piezoelectric printhead waveform. The method includes acquiring driving waveform parameters and generating positive and negative voltage driving datasets based on these parameters; controlling a pulse repetition unit to perform closed-loop voltage regulation based on the positive and negative voltage driving datasets to obtain positive and negative voltage power supplies; sequentially determining the type of each pulse based on the positive and negative voltage driving datasets; generating corresponding gating signals based on the pulse types and constructing a transmission link between the pulse repetition unit and the piezoelectric printhead based on the gating signals; and transmitting the voltages output from the positive and negative voltage power supplies to the corresponding piezoelectric printheads through the transmission link to generate driving waveforms. This invention generates driving waveforms with both positive and negative voltages to match the voltage requirements of the piezoelectric printhead, thereby controlling the ink droplet intake and ejection process and meeting the control requirements of OLED inkjet printing for ink droplet volume and ejection accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of inkjet printing technology, and in particular to a piezoelectric printhead waveform control method, system, device and storage medium. BACKGROUND

[0002] In the field of OLED inkjet printing, the field of electrofluidic printing and the field of fine photoresist glue spraying, it is required that the piezoelectric printhead can accurately spray small volume ink droplets (pL order of magnitude), and different piezoelectric printhead drive voltages are different. At the same time, in the control of the piezoelectric printhead, the positive and negative voltages will produce different driving effects, thereby affecting the volume and accuracy of the sprayed ink droplets, which requires a high-precision and wide-range adjustable control method and device for the piezoelectric printhead. However, the existing piezoelectric printhead waveform control method can only generate unipolar (pure positive or pure negative) drive voltage, and cannot provide positive and negative pressure driving waveforms at the same time, resulting in a mismatch between the drive voltage and the printhead requirement, insufficient voltage precision, and ultimately failing to meet the control requirements of ink droplet volume and spraying accuracy in the high-precision field. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a piezoelectric printhead waveform control method, system, device and storage medium. The piezoelectric printhead waveform control method of the present application realizes accurate regulation and control of positive and negative pressure cooperative driving by the steps of first acquiring drive waveform parameters and generating positive and negative pressure drive data sets, then controlling the pulse repetition unit based on the data set to obtain positive and negative power supplies through closed loop voltage adjustment, and finally judging the pulse type and constructing the corresponding transmission link, and finally transmitting the positive and negative voltage to the printhead to generate the drive waveform. The problem that the prior art cannot simultaneously output positive and negative pressure waveforms suitable for the printhead is solved, thereby meeting the control requirements of ink droplet volume and spraying accuracy in the high-precision field such as OLED inkjet printing.

[0004] The first aspect of the present application provides a piezoelectric printhead waveform control method applied to a piezoelectric printhead waveform control system, wherein the piezoelectric printhead waveform control system comprises a control device, a pulse repetition unit and a piezoelectric printhead electrically connected to the control device; the piezoelectric printhead waveform control method comprises the steps of:

[0005] acquiring drive waveform parameters and generating positive and negative pressure drive data sets according to the drive waveform parameters;

[0006] controlling the pulse repetition unit based on the positive and negative pressure drive data sets to perform closed loop voltage adjustment to obtain positive and negative power supplies;

[0007] judging the type of each pulse based on the positive and negative pressure drive data sets to determine the pulse type;

[0008] Generate a corresponding gating signal based on the pulse type, and construct a transmission link between the pulse repetition unit and the piezoelectric nozzle based on the gating signal;

[0009] The voltages output from the positive and negative power supplies are transmitted to the corresponding piezoelectric nozzles via a transmission link to generate drive waveforms.

[0010] Optionally, in a first implementation of the first aspect of the present invention, the step of obtaining the driving waveform parameters and generating a positive and negative voltage driving dataset based on the driving waveform parameters includes: obtaining the driving waveform parameters; the driving waveform parameters include a positive voltage value, a negative voltage value, a single pulse duration, and a total number of pulses; performing parameter verification on the driving waveform parameters to determine whether the input positive voltage value, negative voltage value, and pulse duration are within a preset parameter range; if they are within the preset parameter range, classifying and parsing the driving waveform parameters to obtain a positive and negative voltage driving dataset.

[0011] Optionally, in a second implementation of the first aspect of the present invention, the pulse repetition unit includes a DC-DC boost power supply; the DC-DC boost power supply is electrically connected to the control device; the step of controlling the pulse repetition unit to perform closed-loop voltage regulation based on the positive and negative voltage drive dataset to obtain a positive voltage power supply and a negative voltage power supply includes: the positive and negative voltage drive dataset includes a positive voltage drive dataset and a negative voltage drive dataset; based on a preset positive voltage in the positive voltage drive dataset, adjusting the positive voltage output by the DC-DC boost power supply, and correcting the voltage deviation in real time through closed-loop feedback to match the positive voltage with the preset positive voltage to obtain a positive voltage power supply; based on a preset negative voltage in the negative voltage drive dataset, adjusting the negative voltage output by the DC-DC boost power supply, and correcting the voltage deviation in real time through closed-loop feedback to match the negative voltage with the preset negative voltage to obtain a negative voltage power supply.

[0012] Optionally, in a third implementation of the first aspect of the present invention, the step of determining the pulse type by sequentially judging the type of each pulse based on the positive and negative pressure driving dataset includes: extracting pulse identification information and pulse position information of each pulse from the positive and negative pressure driving dataset; the pulse identification information is a preset positive pressure identifier or negative pressure identifier; judging the pulse identification information of each pulse according to the order of the pulse position information; if the pulse identification information is a positive pressure identifier, then the pulse type is determined to be a positive pressure pulse; if the pulse identification information is a negative pressure identifier, then the pulse type is determined to be a negative pressure pulse.

[0013] Optionally, in a fourth implementation of the first aspect of the present invention, the step of generating a corresponding gating signal according to the pulse type and constructing a transmission link between the pulse repetition unit and the piezoelectric nozzle according to the gating signal includes: if the pulse type is a positive pressure pulse, generating a positive pressure gating on signal and a negative pressure gating off signal, controlling the conduction of the path between the positive pressure power supply and the piezoelectric nozzle through the positive pressure gating on signal, and controlling the cut-off of the path between the negative pressure power supply and the piezoelectric nozzle through the negative pressure gating off signal, thereby constructing a transmission link between the positive pressure power supply and the piezoelectric nozzle; if the pulse type is a negative pressure pulse, generating a negative pressure gating on signal and a positive pressure gating off signal, controlling the conduction of the path between the negative pressure power supply and the piezoelectric nozzle through the negative pressure gating on signal, and controlling the cut-off of the path between the positive pressure power supply and the piezoelectric nozzle through the positive pressure gating off signal, thereby constructing a transmission link between the negative pressure power supply and the piezoelectric nozzle.

[0014] Optionally, in a fifth implementation of the first aspect of the present invention, the step of transmitting the voltages output by the positive and negative power supplies to the corresponding piezoelectric nozzles via a transmission link to generate a driving waveform includes: when the transmission link is from the positive power supply to the piezoelectric nozzle, transmitting the voltage output by the positive power supply to the positive pin of the piezoelectric nozzle via the transmission link, and grounding the negative pin of the piezoelectric nozzle to form a positive driving voltage on the piezoelectric nozzle; when the transmission link is from the negative power supply to the piezoelectric nozzle, transmitting the voltage output by the negative power supply to the negative pin of the piezoelectric nozzle via the transmission link, and grounding the positive pin of the piezoelectric nozzle to form a negative driving voltage on the piezoelectric nozzle; and alternately forming the positive and negative driving voltages on the piezoelectric nozzle according to the order of the pulse position information, so that the piezoelectric nozzle generates a driving waveform with alternating positive and negative voltages.

[0015] A second aspect of the present invention provides a piezoelectric nozzle waveform control system, the piezoelectric nozzle waveform control system comprising a control device and a pulse repetition unit and a piezoelectric nozzle electrically connected to the control device; the control device is used to execute the piezoelectric nozzle waveform control method described in any of the preceding claims.

[0016] Optionally, in a first implementation of the second aspect of the present invention, the control device includes a host computer and a main control FPGA; the host computer is electrically connected to the main control FPGA, and the main control FPGA is electrically connected to the pulse repetition unit; the host computer is used to acquire driving waveform parameters, verify and classify the driving waveform parameters to generate a positive and negative voltage driving dataset, and transmit the positive and negative voltage driving dataset to the main control FPGA; the main control FPGA is used to receive the positive and negative voltage driving dataset, and output a closed-loop voltage regulation command to the pulse repetition unit based on the positive and negative voltage driving dataset; the pulse repetition unit includes a DC-DC boost power supply and A high-voltage gating module is included; the DC-DC boost power supply is used to construct a positive or negative voltage power supply under the closed-loop voltage regulation command of the main control FPGA; the high-voltage gating module is used to receive gating signals to control the conduction or cutoff of the path between the positive or negative voltage power supply and the piezoelectric printhead; the piezoelectric printhead is provided with a positive pin and a negative pin, the positive pin is used to receive the voltage output by the positive voltage power supply, and the negative pin is used to receive the voltage output by the negative voltage power supply; the piezoelectric printhead is provided with a piezoelectric ceramic component, which can deform based on the positive or negative driving voltage to realize ink droplet ejection.

[0017] A third aspect of the present invention provides a piezoelectric nozzle waveform control device, the piezoelectric nozzle waveform control device comprising: a memory and at least one processor, the memory storing instructions; at least one processor calling the instructions in the memory to cause the computer device to execute the various steps of the piezoelectric nozzle waveform control method described in any of the preceding claims.

[0018] A fourth aspect of the present invention provides a computer-readable storage medium storing instructions that, when executed by a processor, implement the steps of the piezoelectric nozzle waveform control method described in any of the preceding claims.

[0019] In the technical solution of this invention, firstly, by acquiring driving waveform parameters, core parameters such as positive and negative voltage values ​​required by different printheads can be collected in a targeted manner, and the parameters are classified and analyzed into positive and negative voltage driving datasets, providing a data foundation for subsequent precise control; secondly, based on the positive and negative voltage driving datasets, the pulse repetition unit is controlled to perform closed-loop voltage regulation to ensure that the output positive and negative voltage power supplies are precisely matched with the preset values ​​of the dataset; then, the positive and negative voltage requirements are precisely distinguished according to the pulse timing and corresponding transmission links are constructed to ensure that the positive and negative voltage drives do not conflict and can switch as needed; finally, the precisely matched positive and negative voltages are alternately transmitted to the printhead through the transmission links to generate a driving waveform with both positive and negative voltages, matching the voltage requirements of the piezoelectric printhead, thereby precisely controlling the ink droplet intake and ejection process, and ultimately meeting the control requirements of OLED inkjet printing for ink droplet volume and ejection accuracy. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a first flowchart of the piezoelectric nozzle waveform control method provided in an embodiment of the present invention;

[0022] Figure 2 This is a second flowchart of the piezoelectric nozzle waveform control method provided in an embodiment of the present invention;

[0023] Figure 3 This is a third flowchart of the piezoelectric nozzle waveform control method provided in the embodiments of the present invention;

[0024] Figure 4 This is a fourth flowchart of the piezoelectric nozzle waveform control method provided in the embodiments of the present invention;

[0025] Figure 5 This is a fifth flowchart of the piezoelectric nozzle waveform control method provided in an embodiment of the present invention;

[0026] Figure 6 The sixth flowchart of the piezoelectric nozzle waveform control method provided in the embodiments of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the piezoelectric nozzle waveform control system provided in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the piezoelectric nozzle waveform control device provided in an embodiment of the present invention;

[0029] Figure 9 The circuit diagram of the high-voltage gating module provided in the embodiment of the present invention is shown. Detailed Implementation

[0030] This invention provides a method, system, device, and storage medium for controlling the waveform of a piezoelectric printhead. First, by acquiring drive waveform parameters, it can selectively collect core parameters such as positive and negative voltage values ​​required by different printheads, and classify and analyze these parameters into positive and negative voltage drive datasets, providing a data foundation for subsequent precise control. Second, based on the positive and negative voltage drive datasets, it controls a pulse repetition unit to perform closed-loop voltage regulation, ensuring that the output positive and negative voltage power supplies precisely match the preset values ​​in the dataset. Then, it precisely distinguishes between positive and negative voltage requirements according to the pulse timing and constructs corresponding transmission links, ensuring that positive and negative voltage drives do not conflict and can switch as needed. Finally, it alternately transmits the precisely matched positive and negative voltages to the printhead through the transmission links, generating a drive waveform that combines positive and negative voltages, matching the voltage requirements of the piezoelectric printhead, thereby precisely controlling the ink droplet intake and ejection process, ultimately meeting the control requirements of OLED inkjet printing for ink droplet volume and ejection accuracy.

[0031] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" or "having" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] For ease of understanding, the specific process of the embodiments of the present invention is described below. Please refer to [link / reference]. Figure 1 One embodiment of the piezoelectric nozzle waveform control method in this invention includes:

[0033] The piezoelectric nozzle waveform control system includes: a control device, a pulse repetition unit electrically connected to the control device, and a piezoelectric nozzle;

[0034] The control device includes a host computer and a main control FPGA;

[0035] The host computer uses an industrial-grade PC equipped with custom-developed visual operation software. It is used to receive the drive waveform parameters (drive waveform required for nozzle drive, peak number setting, drive voltage setting, and pulse duration) input by the operator. The host computer also analyzes the set waveform data, counts the voltage value, duration, and number of positive and negative pulses, and then transmits the positive and negative pressure drive data to the main control FPGA respectively.

[0036] The main control FPGA can be a Xilinx Artix-7 series XC7A35T chip, which has high-speed data processing and multi-port control capabilities. The main control FPGA is used to receive control signals and data from the PC host computer. The main control FPGA controls the power supply regulation of the DCDC boost power supply in the corresponding pulse repetition unit, controls the positive voltage power supply to regulate the voltage value of the positive voltage pulse, and regulates the absolute value of the negative voltage power supply to the negative voltage pulse.

[0037] The host computer is electrically connected to the ETH port of the main control FPGA via an Ethernet interface to send drive waveform parameters; the SPI interface of the main control FPGA is electrically connected to the control port of the pulse repetition unit to send voltage adjustment commands; the IO interface of the main control FPGA is electrically connected to the control terminal of the high voltage gating module of the pulse repetition unit and the status feedback terminal of the piezoelectric nozzle to output gating signals and receive nozzle working status signals.

[0038] The pulse repetition unit can be configured with 2-8 channels according to the pulse quantity requirements. Each channel includes a DC-DC boost power supply and a high-voltage gating module.

[0039] DC-DC boost power supply: Select a closed-loop boost circuit based on the LM5022 integrated chip (or a basic boost circuit can be selected, combined with the PWM control signal of the main control FPGA and a closed-loop control module composed of the AD8220 voltage sampling chip).

[0040] High Voltage Gating Module Reference Figure 9 ,like Figure 9 As shown, the high-voltage gating module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a first transistor Q1, and a third transistor Q3. The first terminal of the first resistor R1 is connected to the boost power supply output terminal HVI. The second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2, the first terminal of the first capacitor C1, and the source of the first transistor Q1. The second terminal of the second resistor R2 is connected to the first terminal of the fourth resistor R4 and the collector of the third transistor Q3. The gate of transistor Q3 is connected to the second terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6. The emitter of the third transistor Q3 and the second terminal of the sixth resistor R6 are grounded. The first terminal of the fifth resistor R5 is connected to the IO port FPGA_IO of the main control FPGA. The second terminal of the fourth resistor R4 is connected to the second terminal of the first capacitor C1 and the gate of the first transistor Q1. The drain of the first transistor Q1 is connected to the first terminal of the second capacitor C2, the first terminal of the third resistor R3 and the first test port TP1. The second terminal of the second capacitor C2 and the second terminal of the third resistor R3 are grounded.

[0041] When the FPGA_IO control outputs a valid high-level signal, the third transistor Q3 is turned on, and the second resistor R2 acts as a voltage divider, causing the first transistor Q1 to also turn on. At this time, the first test port TP1 is equal to the boost power supply output terminal HVI. If the FPGA_IO is low, the third transistor Q3 and the first transistor Q1 are not turned on, and the first test port TP1 is connected to ground through the third resistor R3, with an output of 0. This part can be used to control the selection of the boost power supply output terminal HVI, and the pulse duration can be controlled through the main control FPGA.

[0042] Each pulse repetition unit can be assigned as a positive pressure output unit (outputting a preset positive pressure based on a positive pressure drive dataset to form a positive pressure power supply) or a negative pressure output unit (outputting a preset negative pressure based on a negative pressure drive dataset to form a negative pressure power supply); when multiple units are configured, independent control of multiple pulses can be achieved; for example, in a three-pulse scenario, the first pulse can be assigned as a positive pressure output, the second as a negative pressure output, and the third as a positive pressure output, with each pulse independently adjusting its voltage and responding to the gating signal, avoiding accuracy deviations caused by repeated voltage switching of a single unit; the high-voltage gating module controls the connection and disconnection of the corresponding unit and the piezoelectric nozzle according to the control signal of the main control FPGA, ensuring accurate timing of multiple pulses;

[0043] The control terminals of all pulse repetition units are electrically connected to the main control FPGA through the extended SPI interface to receive independent voltage regulation commands; the control terminal of the high voltage gating module of each unit is electrically connected to the main control FPGA through the IO interface to receive a dedicated gating signal.

[0044] The piezoelectric printhead uses a single-hole piezoelectric printhead with an integrated piezoelectric ceramic component. The printhead has one positive pin and one negative pin. It receives the voltage from all positive pressure output units through the positive pin and the voltage from all negative pressure output units through the negative pin. Based on the timing control of different units, the piezoelectric ceramic component alternately produces "cavity expansion-cavity contraction" deformation. In multi-pulse scenarios, the voltage of the first positive pressure unit drives the ceramic to draw air, the voltage of the second negative pressure unit drives the ceramic to spray ink, and the voltage of the third positive pressure unit drives the ceramic to draw air again, realizing multi-pulse continuous jetting and improving the accuracy of droplet volume control. The status feedback terminal of the piezoelectric printhead is electrically connected to the IO interface of the main control FPGA through a signal line to provide feedback on the jetting status corresponding to each pulse.

[0045] The control principle of the piezoelectric nozzle waveform control system is as follows:

[0046] The host computer of the control device receives the drive waveform parameters input by the operator, performs compliance verification on the parameters, and confirms that the parameters are within the preset valid range. After confirming that the parameters are within the preset valid range, the parameters are classified and analyzed to extract the voltage value, duration, and pulse position information corresponding to the positive and negative pulses, and integrate them to form a positive and negative voltage drive dataset. Subsequently, the host computer transmits the positive and negative voltage drive dataset to the main control FPGA. The main control FPGA performs integrity verification on the received dataset. After the verification is successful, it stores the dataset in a designated buffer area and issues unit configuration instructions to the pulse repetition units according to the number of pulses contained in the dataset, clarifying the functional allocation (positive voltage output or negative voltage output) of each pulse repetition unit.

[0047] Based on the positive and negative voltage drive dataset and the unit function allocation results, the main control FPGA sends voltage regulation commands to each pulse repetition unit through the communication interface, specifying the target voltage to be output by each unit. After receiving the command, the DC-DC boost power supply module of each pulse repetition unit starts the closed-loop voltage regulation process. It collects the output voltage in real time through the built-in voltage sampling component and feeds the sampled data back to the main control FPGA or the internal control chip of the module. It compares the deviation between the sampled voltage and the target voltage and dynamically corrects the output parameters until the output voltage of each unit is stable within the accuracy range corresponding to the target voltage, thus forming a positive voltage power supply or a negative voltage power supply respectively. The main control FPGA monitors the voltage regulation status of each unit in real time. After all units have reached the target voltage and stabilized, it enters the pulse control stage.

[0048] The main control FPGA initializes the pulse counter and triggers the control flow of each pulse sequentially according to the pulse position information centrally recorded in the positive and negative pressure drive data. For each pulse, the main control FPGA reads its corresponding pulse identification information to determine whether the pulse type is a positive pressure pulse or a negative pressure pulse. Based on the determination result, the main control FPGA sends a gating enable signal to the pulse repetition unit with the corresponding function (positive pressure pulse corresponds to the positive pressure output unit, and negative pressure pulse corresponds to the negative pressure output unit), and simultaneously sends a gating disable signal to the pulse repetition units with other functions. The pulse repetition unit that receives the gating enable signal turns on its high-voltage gating module, establishing a transmission link between the unit and the piezoelectric nozzle. The pulse repetition unit that receives the gating disable signal turns off its high-voltage gating module, and the output terminal is grounded through a pull-down resistor to avoid noise interference.

[0049] By switching the transmission link between each pulse repetition unit and the piezoelectric printhead in sequence, the piezoelectric printhead receives the voltage output from the positive or negative power supply corresponding to each pulse. The piezoelectric ceramic component inside the printhead deforms according to the polarity of the received voltage. With the alternating input of each pulse voltage, the piezoelectric ceramic component continuously deforms periodically, thereby forming an alternating positive and negative pressure drive waveform on the printhead, realizing the intake and ejection of ink droplets. Throughout the process, the status feedback terminal of the piezoelectric printhead transmits real-time working status signals to the main control FPGA. The main control FPGA monitors the generation of the drive waveform and the ink droplet ejection status based on the feedback signals. If voltage deviation exceeds the limit, link abnormality or ejection failure occurs, an alarm mechanism is immediately triggered and the process is paused to ensure stable system operation and drive control accuracy.

[0050] The piezoelectric nozzle waveform control method includes the following steps:

[0051] 101. Obtain the driving waveform parameters and generate positive and negative voltage driving datasets based on the driving waveform parameters;

[0052] In this embodiment, the host computer of the control device receives the driving waveform parameters (including positive voltage value, negative voltage value, duration of a single pulse and total number of pulses) input by the operator. First, the parameters are verified for compliance (confirming that the parameters are within the preset valid range). Then, the parameters are classified and analyzed according to the pulse polarity attribute, and the voltage, timing and position information of the positive and negative pulses are extracted and integrated to form a structured positive and negative voltage driving dataset.

[0053] 102. Closed-loop voltage regulation is performed by controlling the pulse repetition unit based on the positive and negative voltage drive dataset to obtain positive and negative voltage power supplies;

[0054] In this embodiment, the main control FPGA sends a voltage adjustment command to the DC-DC boost power supply of the pulse repetition unit based on the preset positive and preset negative voltage parameters in the positive and negative voltage drive data set. The DC-DC boost power supply stabilizes the output voltage within the accuracy range corresponding to the preset positive and preset negative voltages through closed-loop feedback, and finally forms a positive voltage power supply and a negative voltage power supply that meet the drive requirements.

[0055] 103. Based on the positive and negative pressure drive dataset, perform type judgment on each pulse sequentially to determine the pulse type;

[0056] In this embodiment, the main control FPGA extracts the pulse identification information and pulse position information of each pulse from the positive and negative pressure drive dataset. According to the order of pulse position, it determines the polarity attribute corresponding to the pulse identification information one by one, and then determines whether each pulse is a positive pressure pulse or a negative pressure pulse, providing a type basis for subsequent link control.

[0057] 104. Generate a corresponding gating signal according to the pulse type, and construct a transmission link between the pulse repetition unit and the piezoelectric nozzle based on the gating signal;

[0058] In this embodiment, if the pulse type is a positive pressure pulse, a positive pressure gating on signal and a negative pressure gating off signal are generated to connect the positive pressure power supply and the piezoelectric nozzle and to cut off the negative pressure path; if it is a negative pressure pulse, a negative pressure gating on signal and a positive pressure gating off signal are generated to connect the negative pressure power supply and the piezoelectric nozzle and to cut off the positive pressure path.

[0059] 105. The voltages output from the positive and negative power supplies are transmitted to the corresponding piezoelectric nozzles via a transmission link to generate a drive waveform;

[0060] In this embodiment, the positive voltage power supply is transmitted to the positive and negative terminals of the printhead via a positive voltage transmission link, forming a positive driving voltage; the negative voltage power supply is transmitted to the negative and positive terminals of the printhead via a negative voltage transmission link, forming a negative driving voltage; the positive and negative driving voltages are transmitted alternately according to the pulse position timing, so that the piezoelectric printhead generates a driving waveform with alternating positive and negative voltages, which meets the control requirements of ink droplets for high-precision printing.

[0061] In this embodiment of the invention, firstly, by acquiring driving waveform parameters, core parameters such as positive and negative voltage values ​​required by different printheads can be collected and classified into positive and negative voltage driving datasets, providing a data foundation for subsequent precise control. Secondly, based on the positive and negative voltage driving datasets, the pulse repetition unit is controlled to perform closed-loop voltage regulation, ensuring that the output positive and negative voltage power supplies are precisely matched with the preset values ​​in the dataset. Then, the positive and negative voltage requirements are precisely distinguished according to the pulse timing and corresponding transmission links are constructed to ensure that the positive and negative voltage drives do not conflict and can switch as needed. Finally, the precisely matched positive and negative voltages are alternately transmitted to the printhead through the transmission links to generate a driving waveform with both positive and negative voltages, matching the voltage requirements of the piezoelectric printhead, thereby precisely controlling the ink droplet intake and ejection process, and ultimately meeting the control requirements of OLED inkjet printing for ink droplet volume and ejection accuracy.

[0062] Please see Figure 2 Two embodiments of the piezoelectric nozzle waveform control method in this invention include:

[0063] 201. Obtain the driving waveform parameters; the driving waveform parameters include the positive voltage value, the negative voltage value, the duration of a single pulse, and the total number of pulses;

[0064] In this embodiment, the acquisition of driving waveform parameters is achieved through the host computer of the control device. The host computer is equipped with a visual operation interface. The operator can manually input or call preset parameter templates to select the corresponding driving waveform parameters according to the model and specifications of the piezoelectric printhead to be driven (such as the driving voltage adaptation range) and the application scenario requirements (such as the ink droplet volume target for OLED inkjet printing). Among them, the setting of positive voltage value and negative voltage value must match the pressure resistance range of the piezoelectric printhead; the duration of a single pulse must be set in combination with the ink droplet ejection response speed to ensure that the piezoelectric ceramic has enough time to complete the corresponding deformation; the total number of pulses is determined according to the line length and dot density of the printed pattern.

[0065] 202. Perform parameter verification on the drive waveform parameters to determine whether the input positive voltage value, negative voltage value and pulse duration are within the preset parameter range;

[0066] In this embodiment, parameter verification is performed by a built-in verification algorithm on the host computer. The preset parameter range is determined based on the system hardware capabilities and printhead safety thresholds: the preset range for positive and negative voltage values ​​is 5V-200V (to match the output limit of the DC-DC boost power supply in the pulse repetition unit, avoiding overvoltage damage to the power supply or printhead), and the preset range for the duration of a single pulse is 0.1μs-10μs (below 0.1μs, the piezoelectric ceramic cannot complete effective deformation; above 10μs, ink droplets will accumulate excessively in the nozzle, affecting accuracy). During verification, the host computer compares the input parameters with the preset range one by one. If the voltage value and the duration of a single pulse are both within the range, the parameters are deemed compliant. If a parameter exceeds the range, the host computer immediately displays an alarm prompt, clearly indicating the out-of-specification parameter and the compliant range, and the operator corrects it before re-verification. The core principle of the verification step is to use hardware capabilities and printhead characteristics to inversely constrain the parameters, avoiding hardware damage or driver failure due to abnormal parameters.

[0067] 203. If it is within the preset parameter range, the driving waveform parameters are classified and analyzed to obtain the positive and negative pressure driving dataset;

[0068] In this embodiment, parameter classification and parsing are performed by the data analysis module of the host computer. The core logic is to decompose parameters based on pulse polarity attributes to form structured data that can be directly called by the main control FPGA. First, the "positive voltage value" and "negative voltage value" in the driving waveform parameters are extracted and associated with the voltage attributes of "positive pulse" and "negative pulse" respectively. Second, the "duration of a single pulse" is extracted and allocated according to the pulse polarity (i.e., the duration of the positive pulse and the duration of the negative pulse; if the parameters have the same duration, they are directly reused). Finally, the polarity of each pulse is determined by combining the "total number of pulses" with the preset pulse sequence rules. The system identifies the pulses (positive or negative) and their positions (the order of the first to Nth pulses). After parsing, the "voltage value-duration-position-polarity identifier" of positive pulses is integrated to form a positive voltage drive subset, and the "voltage value-duration-position-polarity identifier" of negative pulses is integrated to form a negative voltage drive subset. Together, they constitute the positive and negative voltage drive datasets. Classification and parsing transform the scattered parameters into a structured dataset with clear polarity distinctions, which facilitates the subsequent rapid identification of pulse types and accurate calling of corresponding voltage parameters by the main control FPGA, avoiding drive polarity errors caused by parameter confusion (such as using negative voltage parameters for positive voltage output).

[0069] Please see Figure 3 The three embodiments of the piezoelectric nozzle waveform control method in this invention include:

[0070] The pulse repetition unit includes a DC-DC boost power supply; the DC-DC boost power supply is electrically connected to the control device;

[0071] In this embodiment, the DC-DC boost power supply in the pulse repetition unit is the core hardware for voltage output. By matching the preset voltage requirements of the positive voltage drive dataset and the negative voltage drive dataset, a positive voltage power supply and a negative voltage power supply are formed.

[0072] The positive and negative voltage driving datasets include positive voltage driving datasets and negative voltage driving datasets;

[0073] In this embodiment, the positive voltage drive dataset is a structured integration of positive pulse-related information in the drive waveform parameters. It includes a preset positive voltage (i.e., the target voltage value that the positive pulse needs to output), the duration of the positive pulse, the position identifier of the positive pulse in the sequence, and the polarity identifier of the positive voltage. Its core function is to provide a precise basis for the positive voltage adjustment of the pulse repetition unit. The negative voltage drive dataset, on the other hand, integrates negative pulse information, including a preset negative voltage (i.e., the target voltage value that the negative pulse needs to output), the duration of the negative pulse, the position identifier of the negative pulse, and the polarity identifier of the negative voltage, ensuring that the negative voltage adjustment has a clear parameter reference.

[0074] 301. Based on the preset positive voltage in the positive voltage drive data set, adjust the positive voltage output of the DC-DC boost power supply, and correct the voltage deviation in real time through closed-loop feedback to match the positive voltage with the preset positive voltage to obtain a positive voltage power supply.

[0075] In this embodiment, firstly, the main control FPGA extracts the preset positive voltage parameters from the positive voltage drive dataset and sends the corresponding target voltage adjustment command to the DCDC boost power supply of the pulse repetition unit through the communication interface. After receiving the command, the DCDC boost power supply's internal control chip (such as LM5022) controls the boost circuit to work by adjusting the duty cycle of the PWM signal, changing the energy storage and discharge efficiency of the input voltage, and gradually bringing the output voltage closer to the preset positive voltage. Secondly, closed-loop feedback correction is started synchronously. The output terminal of the DCDC boost power supply samples the output voltage through a voltage divider resistor network and transmits the sampled voltage to the feedback pin of the internal control chip. The control chip compares the sampled voltage with the internal reference voltage, calculates the voltage deviation, and if the output voltage is low... If the preset positive voltage is reached, the duty cycle of the PWM signal is increased to boost the output voltage. If the output voltage is higher than the preset positive voltage, the duty cycle of the PWM signal is decreased to reduce the output voltage. The main control FPGA monitors the output voltage data of the DC-DC boost power supply in real time until the output voltage stabilizes within the range of ±0.1V of the preset positive voltage. At this point, the output of the DC-DC boost power supply is the positive voltage power supply. This embodiment uses a closed-loop feedback mechanism to eliminate power output drift and load disturbance, ensuring voltage regulation accuracy at the 0.1V level. This provides a stable driving basis for the positive deformation of the piezoelectric ceramic (expanding the nozzle cavity) and avoids the influence of positive pressure deviation on the consistency of ink droplet intake. Its advantage lies in achieving the accuracy and reliability of positive pressure regulation through the combination of structured datasets and closed-loop control.

[0076] 302. Based on the preset negative voltage in the negative voltage drive data set, adjust the negative voltage output of the DC-DC boost power supply, and correct the voltage deviation in real time through closed-loop feedback to match the negative voltage with the preset negative voltage to obtain a negative voltage power supply.

[0077] In this embodiment, the closed-loop methodology of positive voltage regulation is adopted. First, the main control FPGA extracts the preset negative voltage parameter from the negative voltage drive dataset. Considering that the DC-DC boost power supply hardware defaults to outputting a positive voltage, the preset negative voltage is mapped to the corresponding positive absolute voltage parameter, and the adjustment command of the positive absolute voltage is sent to the DC-DC boost power supply of another pulse repetition unit. This DC-DC boost power supply uses the same boost circuit and control logic as the positive voltage regulation, and adjusts the duty cycle of the PWM signal through the internal control chip to gradually approach the positive absolute voltage corresponding to the preset negative voltage. Second, the closed-loop feedback correction process is similar to... The process is the same as step 301. The output voltage of the DC-DC boost power supply is sampled through a voltage divider resistor network. The sampled data is transmitted to the internal control chip. The chip compares the sampled voltage with the reference voltage to calculate the deviation and corrects the duty cycle of the PWM signal in real time until the output voltage stabilizes within ±0.1V of the positive absolute value voltage corresponding to the preset negative voltage. At this point, the output of this DC-DC boost power supply becomes the voltage basis of the negative voltage power supply. Subsequently, it is connected to the negative pin of the piezoelectric printhead through a transmission link to form the required negative voltage drive effect. This provides a stable drive for the reverse deformation of the piezoelectric ceramic (reducing the nozzle cavity) and ensures precise control of the ink droplet ejection volume.

[0078] Please see Figure 4 The four embodiments of the piezoelectric nozzle waveform control method in this invention include:

[0079] 401. Extract the pulse identification information and pulse position information of each pulse from the positive and negative pressure drive dataset; the pulse identification information is a preset positive pressure identifier or negative pressure identifier;

[0080] In this embodiment, during the initial classification and parsing of the positive and negative pressure drive dataset, the attributes and position information of each pulse are associated and stored. The "pulse identification information" is a preset identifier used to distinguish the polarity of the pulse (e.g., "1" represents positive pressure and "0" represents negative pressure). This identifier corresponds to the voltage attribute of the pulse, ensuring consistency between the identifier and the actual drive requirements. The "pulse position information" is a parameter used to define the sequence of pulses in the entire drive sequence (e.g., using numbers "1, 2, 3...N" to represent the positions of the 1st to Nth pulses), and is associated and stored with parameters such as pulse duration and voltage value. The main control FPGA extracts the pulse identification information and pulse position information of each pulse from the positive and negative pressure drive dataset one by one using a preset data parsing protocol (e.g., reading in the order of "pulse position-identification information-voltage value-duration"). The extracted information is temporarily stored in an internal buffer according to the pulse position number. Utilizing the structured characteristics of the dataset, the core information of pulse control is quickly located and obtained, ensuring a one-to-one correspondence between the identifier and position information of each pulse, providing an accurate basis for subsequent timing-based type determination.

[0081] 402. Determine the pulse identification information of each pulse according to the order of pulse position information;

[0082] In this embodiment, the main control FPGA first reads the pulse position information of all pulses in the buffer and sorts them in ascending order of position number (i.e., from the 1st pulse to the Nth pulse) to form a pulse determination timing queue. Subsequently, the main control FPGA retrieves the pulse identification information corresponding to each pulse one by one according to the queue order and starts the determination process. During the determination process, the main control FPGA has a built-in timing control module that sets the pulse determination interval through a timer (this interval matches the actual output interval of subsequent pulses to ensure that the determination rhythm is synchronized with the driving rhythm), avoiding pulse output timing errors caused by disordered determination order. It follows the timing logic of the driving waveform and uses position information as an anchor point to achieve orderly determination, ensuring that the determination of subsequent pulse types completely matches the order of the actual driving sequence. This embodiment provides a timing reference for subsequent sequential construction of transmission links and output driving voltage through timing determination, ensuring the timing accuracy of the entire driving waveform.

[0083] 403. If the pulse identification information is a positive pressure identifier, then the pulse type is determined to be a positive pressure pulse;

[0084] In this embodiment, when constructing the positive and negative voltage drive dataset, the predefined correspondence between the positive voltage identifier and the positive pulse is clearly defined. That is, the positive voltage identifier uniquely points to the pulse requirement that needs to output a positive voltage. Therefore, when the main control FPGA determines that the identifier information of the current pulse is a positive voltage identifier, it directly determines the type of the pulse as a positive voltage pulse according to the predefined mapping rules, and simultaneously retrieves the corresponding positive voltage value, duration and other parameters from the positive voltage drive dataset, and synchronously associates and stores them in the positive voltage pulse control buffer area, providing complete parameter support for the subsequent generation of positive voltage gating signals and control of positive voltage power supply output.

[0085] 404. If the pulse identification information is a negative pressure identifier, then the pulse type is determined to be a negative pressure pulse;

[0086] In this embodiment, this step is consistent with the determination logic of 403. During the initial data processing, the correspondence between the negative voltage identifier and the negative pulse has been preset, that is, the negative voltage identifier uniquely corresponds to the pulse requirement that needs to output negative voltage. Therefore, when the main control FPGA determines that the identifier information of the current pulse is a negative voltage identifier, it directly determines the pulse type as a negative voltage pulse according to the preset mapping rules, and retrieves the corresponding negative voltage value (or its positive absolute value voltage), duration and other parameters from the negative voltage drive data set, and stores them in the negative voltage pulse control buffer area to provide parameter support for the subsequent generation of negative voltage gating signals and control of negative voltage power supply output.

[0087] Please see Figure 5The five embodiments of the piezoelectric nozzle waveform control method in this invention include:

[0088] 501. If the pulse type is a positive pressure pulse, a positive pressure gating on signal and a negative pressure gating off signal are generated. The positive pressure gating on signal controls the conduction of the path between the positive pressure power supply and the piezoelectric nozzle, and the negative pressure gating off signal controls the cut-off of the path between the negative pressure power supply and the piezoelectric nozzle, so as to establish a transmission link between the positive pressure power supply and the piezoelectric nozzle.

[0089] In this embodiment, firstly, after determining that the pulse type is a positive voltage pulse, the main control FPGA generates a positive voltage gating enable signal (high level) and a negative voltage gating disable signal (low level) according to preset signal level rules (e.g., high level for enable signal, low level for disable signal) – the two types of signals are generated synchronously and their timing is strictly aligned. Secondly, the positive voltage gating enable signal is transmitted to the high-voltage gating module of the pulse repetition unit corresponding to the positive voltage power supply through the GPIO interface: the control stage MOS transistor (e.g., the third transistor Q3) in the high-voltage gating module turns on after receiving the high-level signal, and drives the high-voltage MOS transistor (e.g., the first transistor Q1) to turn on through the voltage divider resistor (e.g., the second resistor R2), so that the path between the output terminal of the positive voltage power supply and the positive pin of the piezoelectric nozzle is complete. The circuit is turned on; simultaneously, the negative voltage selection shutdown signal is transmitted to the high voltage selection module corresponding to the negative voltage power supply: after the control stage MOSFET receives the low-level signal, it turns off, and the high voltage MOSFET turns off accordingly. The output terminal of the negative voltage power supply is grounded through a pull-down resistor (such as the third resistor R3), ensuring that the path between the negative voltage power supply and the negative terminal pin of the piezoelectric nozzle is completely cut off, avoiding interference from negative voltage side noise to the positive voltage transmission; finally, a unique conductive transmission link is formed between the positive voltage power supply and the piezoelectric nozzle, providing a stable path for subsequent positive voltage transmission; in this embodiment, the on / off characteristics of the MOSFET are controlled by the level signal to achieve precise switching of the path, and the interlocking logic of "turning on the positive voltage path + turning off the negative voltage path" eliminates the risk of short circuit caused by the simultaneous connection of positive and negative voltage power supplies to the nozzle.

[0090] 502. If the pulse type is a negative pressure pulse, a negative pressure gating on signal and a positive pressure gating off signal are generated. The negative pressure gating on signal controls the conduction of the path between the negative pressure power supply and the piezoelectric nozzle, and the positive pressure gating off signal controls the cut-off of the path between the positive pressure power supply and the piezoelectric nozzle, thus establishing a transmission link between the negative pressure power supply and the piezoelectric nozzle.

[0091] In this embodiment, similar to the control logic in step 501, firstly, after the main control FPGA determines that the pulse type is a negative voltage pulse, it generates a negative voltage gating on signal (high level) and a positive voltage gating off signal (low level) according to a preset level rule. The two types of signals are output synchronously to ensure timing consistency. Secondly, the negative voltage gating on signal is transmitted to the high voltage gating module of the pulse repetition unit corresponding to the negative voltage power supply. After receiving the high level, the control stage MOSFET turns on and is driven to turn on by the voltage divider resistor, so that the path between the output terminal of the negative voltage power supply and the negative terminal pin of the piezoelectric nozzle is connected. At the same time, the positive voltage gating off signal is transmitted to the high voltage gating module corresponding to the positive voltage power supply. The control stage MOSFET turns off and the high voltage MOSFET turns off accordingly. The output terminal of the positive voltage power supply is grounded through a pull-down resistor to ensure that the path between the positive voltage power supply and the positive terminal pin of the piezoelectric nozzle is cut off, avoiding interference from the positive voltage side to the negative voltage transmission. Finally, a unique conductive transmission link is formed between the negative voltage power supply and the piezoelectric nozzle to meet the negative voltage transmission requirements.

[0092] Please see Figure 6 The six embodiments of the piezoelectric nozzle waveform control method in this invention include:

[0093] 601. When the transmission link is from the positive power supply to the piezoelectric nozzle, the voltage output by the positive power supply is transmitted to the positive pin of the piezoelectric nozzle through the transmission link, and the negative pin of the piezoelectric nozzle is grounded to form a positive driving voltage on the piezoelectric nozzle.

[0094] In this embodiment, firstly, the voltage output by the positive pressure power supply is transmitted directionally to the positive pin of the piezoelectric printhead via the transmission link, while the negative pin of the piezoelectric printhead is grounded through a dedicated grounding line. At this time, the voltage output by the positive pressure power supply is applied to the positive terminal of the printhead, and the negative terminal is grounded to form a potential difference. This potential difference is the positive driving voltage acting on the piezoelectric printhead, which enables the positive driving voltage to act precisely on the piezoelectric ceramic component inside the printhead. This provides a uniform and stable electric field drive for the positive deformation of the piezoelectric ceramic (expanding the nozzle cavity), ensuring the consistency of ink droplet intake and meeting the control requirements of high-precision printing for the air intake process.

[0095] 602. When the transmission link is from the negative power supply to the piezoelectric nozzle, the voltage output from the negative power supply is transmitted to the negative pin of the piezoelectric nozzle through the transmission link, and the positive pin of the piezoelectric nozzle is grounded to form a negative driving voltage on the piezoelectric nozzle.

[0096] In this embodiment, the voltage output by the negative power supply is transmitted to the negative pin of the piezoelectric nozzle via a transmission link, while the positive pin of the piezoelectric nozzle is connected to the system's common ground terminal through a low-impedance grounding line. At this time, the output voltage of the negative power supply is applied to the negative terminal of the nozzle, and the positive terminal is grounded to form a potential difference. This potential difference is the negative driving voltage acting on the piezoelectric nozzle. The polarity of this voltage is opposite to that of the positive driving voltage, thus constructing an electric field direction opposite to that of the positive driving voltage, which satisfies the reverse deformation requirement of the piezoelectric ceramic.

[0097] 603. According to the sequence of pulse position information, positive and negative driving voltages are alternately formed on the piezoelectric nozzle so that the piezoelectric nozzle generates a driving waveform with alternating positive and negative voltages;

[0098] In this embodiment, this step uses the pulse position timing as a reference and achieves the complete output of positive and negative pressure drive waveforms through the logic of "timing control - voltage alternation - waveform generation". First, the main control FPGA retrieves the previously stored pulse position information and synchronously controls the transmission link switching and voltage transmission in the order of "1st pulse → 2nd pulse → ... → Nth pulse": when the position timing corresponding to the positive pressure pulse is triggered, the positive pressure transmission link is turned on and the negative pressure transmission link is turned off, forming a positive drive voltage on the nozzle; when the position timing corresponding to the negative pressure pulse is triggered, the negative pressure transmission link is switched on and the positive pressure link is turned off, forming a negative drive voltage; the voltage switching interval of adjacent pulses matches the pulse position information. The timing interval (controlled by the main FPGA timer) is determined. As the positive and negative driving voltages alternately act on the piezoelectric nozzle, the internal piezoelectric ceramic components undergo periodic deformation based on the alternating voltage polarity, resulting in "expanding the cavity and shrinking the cavity": during positive driving, the ceramic stretches, increasing the volume of the nozzle cavity and completing ink intake; during negative driving, the ceramic contracts, decreasing the volume of the nozzle cavity and completing ink droplet ejection. This alternating deformation process corresponds to the formation of a driving waveform with alternating positive and negative voltages. In this embodiment, timing control is used to achieve orderly switching of voltage polarity, and the target driving waveform is generated by combining the electrostrictive characteristics of the piezoelectric ceramic, thereby meeting the fine control requirements of pL-level ink droplets in fields such as OLED inkjet printing and current fluid printing.

[0099] The piezoelectric nozzle waveform control method in the embodiments of the present invention has been described above. The piezoelectric nozzle waveform control system in the embodiments of the present invention is described below. Please refer to [link / reference]. Figure 7 One embodiment of the piezoelectric nozzle waveform control system of the present invention includes:

[0100] The piezoelectric nozzle waveform control system includes: a control device 701, a pulse repetition unit 702 and a piezoelectric nozzle 703 electrically connected to the control device 701;

[0101] The control device includes a host computer 704 and a main control FPGA 705; the host computer 704 is electrically connected to the main control FPGA 705, and the main control FPGA 705 is electrically connected to the pulse repetition unit 702; the host computer 704 is used to acquire driving waveform parameters, verify and classify the driving waveform parameters to generate positive and negative voltage driving datasets, and transmit the positive and negative voltage driving datasets to the main control FPGA 705; the main control FPGA 705 is used to receive the positive and negative voltage driving datasets and output closed-loop voltage regulation commands to the pulse repetition unit 702 based on the positive and negative voltage driving datasets; the pulse repetition unit 702 includes a DC-DC boost power supply 706 and a high-voltage gate. Module 707; The DC-DC boost power supply module 706 is used to construct a positive or negative power supply under the closed-loop voltage regulation command driven by the main control FPGA 705; The high-voltage gating module 707 is used to receive a gating signal to control the conduction or cutoff of the path between the positive or negative power supply and the piezoelectric nozzle 703; The piezoelectric nozzle 703 is provided with a positive pin and a negative pin, the positive pin is used to receive the voltage output by the positive power supply, and the negative pin is used to receive the voltage output by the negative power supply. The piezoelectric nozzle 703 is provided with a piezoelectric ceramic component, which can deform based on the positive or negative driving voltage to realize ink droplet ejection.

[0102] Figure 8 This is a schematic diagram of a piezoelectric nozzle waveform control device 900 provided in an embodiment of the present invention. The piezoelectric nozzle waveform control device 900 can vary significantly due to different configurations or performance characteristics. It may include one or more central processing units (CPUs) 910 (e.g., one or more processors) and a memory 920, and one or more storage media 930 (e.g., one or more mass storage devices) storing application programs 933 or data 932. The memory 920 and storage media 930 can be temporary or persistent storage. The program stored in the storage media 930 may include one or more modules (not shown in the diagram), each module including a series of instruction operations on the piezoelectric nozzle waveform control device 900. Furthermore, the processor 910 may be configured to communicate with the storage media 930 and execute the series of instruction operations in the storage media 930 on the piezoelectric nozzle waveform control device 900 to implement the steps of the piezoelectric nozzle waveform control method provided in the above-described method embodiments.

[0103] The piezoelectric nozzle waveform control device 900 may also include one or more power supplies 940, one or more wired or wireless network interfaces 950, one or more input / output interfaces 960, and / or one or more operating systems 931, such as Windows Server, Mac OS X, Unix, Linux, FreeBSD, etc. Those skilled in the art will understand that... Figure 9 The illustrated structure of the piezoelectric nozzle waveform control device does not constitute a limitation on the piezoelectric nozzle waveform control device. It may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0104] The present invention also provides a computer-readable storage medium, which can be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to perform the steps of the piezoelectric nozzle waveform control method.

[0105] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system, device, or unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0106] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0107] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A piezoelectric head waveform control method characterized by comprising: The application is applied to a piezoelectric jet waveform control system, and the piezoelectric jet waveform control system comprises a control device, a pulse repetition unit and a piezoelectric jet electrically connected with the control device; the control device comprises an upper computer and a master control FPGA; the upper computer is electrically connected with the master control FPGA, and the master control FPGA is electrically connected with the pulse repetition unit; the pulse repetition unit comprises a DCDC voltage booster and a high-voltage gating module; the DCDC voltage booster and the high-voltage gating module are electrically connected with the control device; the high-voltage gating module is used for controlling the on-off of the passageway between the DCDC voltage booster and the piezoelectric jet according to the control signal of the control device; the piezoelectric jet waveform control method comprises the following steps: obtaining driving waveform parameters and generating positive and negative pressure driving data sets according to the driving waveform parameters; controlling the pulse repetition unit to perform closed-loop voltage regulation based on the positive and negative pressure driving data sets to obtain a positive pressure power supply and a negative pressure power supply; the control of the pulse repetition unit to perform closed-loop voltage regulation based on the positive and negative pressure driving data sets to obtain the positive pressure power supply and the negative pressure power supply comprises: the positive and negative pressure driving data sets comprise a positive voltage driving data set and a negative voltage driving data set; based on a preset positive pressure in the positive voltage driving data set, the positive voltage output by the DCDC voltage booster is adjusted, and the voltage deviation is corrected in real time through closed-loop feedback, so that the positive voltage matches the preset positive pressure, to obtain the positive pressure power supply; based on a preset negative pressure in the negative voltage driving data set, the negative voltage output by the DCDC voltage booster is adjusted, and the voltage deviation is corrected in real time through closed-loop feedback, so that the negative voltage matches the preset negative pressure, to obtain the negative pressure power supply; judging the type of each pulse in sequence based on the positive and negative pressure driving data sets to determine the pulse type; generating a corresponding selection signal according to the pulse type, and constructing a transmission link between the pulse repetition unit and the piezoelectric jet according to the selection signal; the generation of the corresponding selection signal according to the pulse type and the construction of the transmission link between the pulse repetition unit and the piezoelectric jet according to the selection signal comprise: if the pulse type is a positive pressure pulse, a positive pressure gating open signal and a negative pressure gating close signal are generated, the passageway between the positive pressure power supply and the piezoelectric jet is controlled to be conductive through the positive pressure gating open signal, and the passageway between the negative pressure power supply and the piezoelectric jet is controlled to be cut off through the negative pressure gating close signal, to construct the transmission link between the positive pressure power supply and the piezoelectric jet; if the pulse type is a negative pressure pulse, a negative pressure gating open signal and a positive pressure gating close signal are generated, the passageway between the negative pressure power supply and the piezoelectric jet is controlled to be conductive through the negative pressure gating open signal, and the passageway between the positive pressure power supply and the piezoelectric jet is controlled to be cut off through the positive pressure gating close signal, to construct the transmission link between the negative pressure power supply and the piezoelectric jet; transmitting the voltage output by the positive pressure power supply and the negative pressure power supply to the corresponding piezoelectric jet through the transmission link, to generate a driving waveform.

2. The piezoelectric jet wave shape control method according to claim 1, characterized by, The obtaining of the driving waveform parameters and the generation of the positive and negative pressure driving data sets comprise: obtaining driving waveform parameters; the driving waveform parameters comprise a positive pressure voltage value, a negative pressure voltage value, a single pulse duration and a total number of pulses; The parameter verification is performed on the driving waveform parameters to determine whether the input positive voltage value, negative voltage value and pulse duration are within the preset parameter range. If the parameters are within the preset parameter range, the driving waveform parameters are classified and analyzed to obtain positive and negative pressure driving data sets.

3. The piezoelectric jet wave shape control method according to claim 1, wherein The type of each pulse is determined based on the positive and negative pressure driving data sets to determine the pulse type, including: Pulse identification information and pulse position information of each pulse are extracted from the positive and negative pressure driving data sets; the pulse identification information is a preset positive identification or negative identification; The pulse identification information of each pulse is determined according to the order of the pulse position information; If the pulse identification information is a positive identification, the pulse type is determined to be a positive pulse; If the pulse identification information is a negative identification, the pulse type is determined to be a negative pulse.

4. The piezoelectric jet wave shape control method according to claim 1, wherein The voltage output by the positive and negative power supplies is transmitted to the corresponding piezoelectric nozzle through the transmission link to generate a driving waveform, including: When the transmission link is from the positive power supply to the piezoelectric nozzle, the voltage output by the positive power supply is transmitted to the positive pin of the piezoelectric nozzle through the transmission link, and the negative pin of the piezoelectric nozzle is grounded to form a positive driving voltage on the piezoelectric nozzle; When the transmission link is from the negative power supply to the piezoelectric nozzle, the voltage output by the negative power supply is transmitted to the negative pin of the piezoelectric nozzle through the transmission link, and the positive pin of the piezoelectric nozzle is grounded to form a negative driving voltage on the piezoelectric nozzle; The positive and negative driving voltages are alternately formed on the piezoelectric nozzle according to the order of the pulse position information to make the piezoelectric nozzle generate a driving waveform with alternating positive and negative pressures.

5. A piezoelectric jet waveform control system characterized by comprising: The piezoelectric nozzle waveform control system includes a control device, a pulse repetition unit and a piezoelectric nozzle electrically connected to the control device; the control device is used to perform the piezoelectric nozzle waveform control method according to any one of claims 1-4.

6. The piezoelectric jet wave shape control system of claim 5, wherein, The control device comprises a host computer and a master FPGA; the host computer is electrically connected with the master FPGA, and the master FPGA is electrically connected with the pulse repetition unit; the host computer is used for acquiring driving waveform parameters, verifying and classifying the driving waveform parameters to generate positive and negative pressure driving data sets, and transmitting the positive and negative pressure driving data sets to the master FPGA; the master FPGA is used for receiving the positive and negative pressure driving data sets, and outputting closed-loop voltage regulation instructions to the pulse repetition unit based on the positive and negative pressure driving data sets; the pulse repetition unit comprises a DCDC boost power supply and a high-voltage gating module; the DCDC boost power supply module is used for constructing a positive pressure power supply or a negative pressure power supply under the driving of the closed-loop voltage regulation instructions of the master FPGA; the high-voltage gating module is used for receiving a gating signal to control the conduction or cutoff of the passageway between the positive pressure power supply or the negative pressure power supply and the piezoelectric jet head; the piezoelectric jet head is provided with a positive electrode pin and a negative electrode pin, the positive electrode pin is used for receiving the voltage output by the positive pressure power supply, the negative electrode pin is used for receiving the voltage output by the negative pressure power supply, the piezoelectric jet head is internally provided with a piezoelectric ceramic component, and the piezoelectric ceramic component can generate deformation based on a positive driving voltage or a negative driving voltage to realize ink droplet ejection.

7. A piezoelectric jet waveform control apparatus characterized by comprising: The piezoelectric jet head waveform control device comprises a memory and at least one processor, and the memory stores instructions; The at least one processor calls the instructions in the memory to enable the piezoelectric jet head waveform control device to perform the steps of the piezoelectric jet head waveform control method according to any one of claims 1-4.

8. A computer-readable storage medium having stored thereon instructions, the computer-readable storage medium comprising: The instructions are executed by the processor to implement the steps of the piezoelectric jet head waveform control method according to any one of claims 1-4.

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