Pulse voltage thermistor trimming method and system based on adaptive pulse width technology

Abstract

The application belongs to the technical field of printing and discloses a pulse voltage thermistor trimming method based on adaptive pulse width technology, and proposes an adaptive pulse width parameter adjustment method.The core of the method is to adaptively adjust the width of the pulse voltage according to the deviation between the current value and the nominal value of the resistance.When the gap between the two is large, the system will automatically select a wider pulse voltage width to increase the resistance adjustment degree, thereby improving the resistance adjustment efficiency;when the resistance value gap gradually decreases, the pulse voltage width will also decrease accordingly, the resistance adjustment degree is reduced, and the fineness and accuracy of the resistance value adjustment are ensured.The application not only ensures the rapid adjustment of the resistance value, but also ensures the accuracy of the resistance adjustment, and realizes the balance between efficiency and accuracy.This innovative method not only improves the efficiency and accuracy of resistance adjustment, but also provides a new solution for the resistance value adjustment of the thick film resistance array of the thermal printing sheet.

Description

Technical Field

[0001] This invention belongs to the field of printing technology, and particularly relates to a pulse voltage thermistor adjustment method and system based on adaptive pulse width technology. Background Technology

[0002] A thermal printhead consists of an array of thick-film thermistors with similar resistance values. The resistance density, stability, and uniformity of these thermistors directly determine the printing quality. The denser the resistors are packed, the higher the resolution of the printed image and the better the print quality. Currently, the dots per inch (DPI) of thermal printhead resistance typically ranges from 200 to 600. Differences in resistance between resistors have a significant impact on printing quality, according to Joule's law. When a uniform voltage is applied to a resistor array, the heat generated by each resistor will vary significantly due to differences in resistance. This difference in heat directly affects the color change of the printed media coating. Therefore, ensuring the uniformity and stability of the resistance values ​​of the high-density thick-film resistors in the thermal printhead is crucial for ensuring print quality and color consistency.

[0003] The fabrication of thick-film resistors for thermal printheads mainly involves screen printing a prepared resistor paste onto a ceramic substrate, followed by multiple drying and sintering processes to solidify it onto the ceramic substrate. However, due to the inherent inhomogeneity of the substrate surface and the randomness of the sintering conditions, the uniformity and stability of the fabricated thick-film resistors cannot be guaranteed. Therefore, appropriate adjustment techniques are needed to ensure that the resistance values ​​of each resistor deviate from the nominal values ​​within the allowable range.

[0004] The pulse voltage thermistor adjustment method involves applying a high-voltage pulse across the resistor to adjust its resistance. In the initial stage of pulse application, the low-melting-point glass phase inside the resistor is broken down, causing conductive particles to connect and form new conductive paths, thus reducing the resistance. As the pulse continues, the glass phase is further broken down. Continued pulse application may burn out the conductive paths. As the temperature decreases, the conductive particles are re-isolated by the glass phase, and the resistance increases.

[0005] Conventional pulse voltage adjustment methods often employ a fixed pulse width. During adjustment, if a wide pulse is used, there is a risk of over-adjustment, leading to a significant deviation between the adjusted resistance value and the nominal value. This undoubtedly affects the accuracy and stability of the resistor. While using a narrower pulse can improve the accuracy of the adjustment, the excessive number of adjustments significantly reduces efficiency, failing to meet the high-efficiency requirements of practical applications.

[0006] Based on the above analysis, the problems and shortcomings of the existing technology are as follows:

[0007] (1) Conventional pulse voltage adjustment methods often use a fixed pulse width adjustment method. During the adjustment process, if the adjustment pulse is too wide, there is often a risk of over-adjustment, which leads to a large deviation between the adjusted resistance value and the nominal value. This undoubtedly affects the accuracy and stability of the resistance.

[0008] (2) If a narrower pulse adjustment is used, although the accuracy of the resistance adjustment can be improved, the number of adjustments is too large, which significantly reduces the efficiency of the adjustment and does not meet the high efficiency requirements in practical applications. Summary of the Invention

[0009] To address the problems existing in the prior art, this invention provides a pulse voltage thermistor adjustment method based on adaptive pulse width technology.

[0010] This invention is implemented as follows: A pulse voltage thermistor adjustment method based on adaptive pulse width technology includes:

[0011] Step 1: Adaptively adjust the pulse voltage width based on the deviation between the current resistance value and the nominal value;

[0012] Step 2: When the difference between the two is large, the system will automatically select a wider pulse voltage width to increase the resistance adjustment.

[0013] Step 3: As the resistance difference gradually decreases, the pulse voltage width will decrease accordingly, thus reducing the adjustment resistance.

[0014] Furthermore, the method for adaptively adjusting the pulse voltage width based on the deviation between the current resistance value and the nominal value is as follows:

[0015] The relationship between pulse voltage and resistance change during the nth adjustment process:

[0016] y n =f(x) n (1)

[0017] Where n≥1, y n Let x be the resistance change during the nth adjustment. n The voltage width parameter is set for the nth adjustment; R is defined. n Let the resistance value be the value after the nth adjustment. Then:

[0018] y n =R n -R n-1 (2)

[0019] From equations (1) and (2), we can obtain:

[0020] x n =f -1 (y n)=f -1 (R n -R n-1 (3)

[0021] As can be seen from equation (3), if the resistance is to be adjusted from R during the nth adjustment... n-1 Adjust to R n Then the resistance change y during the nth adjustment n Should be in R n -R n-1 That is, the applied pulse width parameter should be x. n .

[0022] Furthermore, the R n-1 and R n All satisfy the relation r i ≤R n ,R n-1 ≤r i-1 When the resistance change is constant, the relationship between the pulse voltage width and the resistance change can be fitted as a polynomial function.

[0023] Furthermore, the R n =r i The applied pulse voltage width x at this time n It can be represented as:

[0024]

[0025] Where i≥1, r i-1 and r i They respectively represent the functional relationship The upper and lower bounds of the resistance value, a i b i c i d i e i r i ≤R n-1 ≤r i-1 The coefficients of the quartic, cubic, quadratic, and linear terms, as well as the constant term.

[0026] Furthermore, when making the nth adjustment, it is necessary to accurately measure the resistance R after the (n-1)th adjustment. n-1 Determine its resistance range and identify the corresponding piecewise function. Then, substituting into equation (4), the required pulse width parameter x can be calculated. n ,Right now:

[0027]

[0028] In equation (5), r i-1 and r i It conforms to the following relationship:

[0029] r0-r1>r1-r2>………>r i-1 -r i ; (6).

[0030] Furthermore, the adaptive pulse voltage regulation method based on the true resistance value includes the following steps:

[0031] a. Turn on the switching device in the circuit of the resistor being adjusted, calculate and record the resistance value R of the resistor before adjustment. n-1 Calculate the deviation between the adjusted resistor and the target nominal value; when the resistance value has entered the allowable range of the target value, end the resistance adjustment to optimize the adjustment process and reduce unnecessary pulse counts; otherwise, proceed to step b.

[0032] b, based on the current resistance R n-1 Determine the corresponding functional relationship within the given interval. Calculate the pulse width x required for the controlled resistor. n ;r i -R n-1 When it is large, the pulse width x n It is also relatively large, with a large change in resistance value, to accelerate the adjustment process of the resistance value; while when r i -R n-1 When it is small, the pulse width x n The resistance is also relatively small, and the change in resistance is small; after completing step a, execute it again.

[0033] Another object of the present invention is to provide a pulse voltage thermistor adjustment system based on adaptive pulse width technology, comprising:

[0034] An adaptive adjustment module is used to adaptively adjust the pulse voltage width based on the deviation between the current resistance value and the nominal value.

[0035] The resistance adjustment module is enlarged so that when the difference between the two is large, the system will automatically select a wider pulse voltage width to increase the resistance adjustment.

[0036] The reduced resistance adjustment module is used to reduce the pulse voltage width as the resistance difference gradually decreases, thereby reducing the resistance adjustment effect.

[0037] Another object of the present invention is to provide a computer device including a memory and a processor, the memory storing a computer program, which, when executed by the processor, causes the processor to perform the steps of the pulse voltage thermistor adjustment method based on adaptive pulse width technology.

[0038] Another object of the present invention is to provide a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the steps of the pulse voltage thermistor adjustment method based on adaptive pulse width technology.

[0039] Another objective of this invention is to provide an information data processing terminal for implementing the pulse voltage thermistor adjustment system based on adaptive pulse width technology.

[0040] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this invention are as follows:

[0041] First, this invention addresses the current situation of long production cycles and low yield rates of thermal printing sheets by providing a pulse voltage adjustment method based on adaptive pulse width technology.

[0042] According to a first aspect of the present invention, a pulse voltage adjustment method for adaptive pulse width of thick film resistors in thermal printheads is provided. Since the core mechanism of the pulse voltage adjustment method is to reduce the resistance by breaking down the glass phase in the resistive body or to increase the resistance by breaking down the conductive chain, this process cannot be described by a single functional relationship as a precise connection between the pulse voltage and the resistance change value.

[0043] However, statistical analysis based on a large amount of experimental data reveals that, for a fixed thermal printhead, the change in resistance value exhibits a relatively clear piecewise functional relationship with the width of the applied pulse voltage. This relationship reflects the regularity and predictability of resistance value changes under different pulse voltage widths. By precisely controlling the pulse voltage width, precise adjustment of the resistance value can be achieved, thus meeting the requirements of precise resistance adjustment.

[0044] This adaptive pulse voltage regulation method, based on the piecewise functional relationship between the resistance change and the applied pulse width, can not only achieve rapid adjustment of the resistance value, but also ensure the stability and accuracy of the adjustment process, thereby improving the performance and yield of the entire resistor array.

[0045] According to a second aspect of the present invention, an efficient and accurate adjustment circuit for a thick-film resistor array on a thermally printed wafer is provided. The core of this circuit lies in its unique structural design, wherein the thermally printed wafer contains multiple thick-film resistors arranged side-by-side to form a regular resistor array. To achieve efficient control and accurate measurement of the resistor array, an efficient adjustment circuit is designed.

[0046] The key to this adjustment circuit lies in the design of the main circuit, which cleverly utilizes switching devices and diodes to achieve seamless switching between the resistance adjustment power supply and the resistance measurement power supply. One end of each adjustable resistor is directly connected to the main circuit power supply, and the other end is connected to the switching device. When the switching device is in the on state, the resistor changes from a floating state to a grounded state, thereby generating a voltage difference across the resistor, activating the corresponding circuit, and enabling the resistance adjustment or measurement to proceed smoothly. When the switching device is off, the resistor returns to the floating state, at which point there is no voltage difference across the resistor, and the corresponding circuit is effectively shut off, thus avoiding potential interference to other circuits.

[0047] By sequentially turning on the switching devices at each ground terminal, the resistance can be detected and precisely adjusted. More importantly, by precisely controlling the on-time of the switching devices, we can accurately control the pulse width of the pulse voltage applied across the resistor being adjusted, thereby achieving high-precision resistance adjustment. This design not only ensures the efficiency of the adjustment process but also significantly improves the accuracy of resistance adjustment, laying a solid foundation for the development and application of thermal printing technology.

[0048] Based on the above technical solution, the present invention can also be improved as follows.

[0049] Optionally, relays are used as switching devices in the main circuit to ensure a long-term and stable power connection when the adjusted resistor circuit is alternately turned on. Simultaneously, diodes are used to effectively isolate the resistance measurement power supply from the resistance adjustment power supply. When the relay is on, the operation of the resistance measurement power supply will not interfere with the resistance adjustment process; conversely, when the relay is off, the resistance adjustment power supply will not affect the resistance measurement operation in any way.

[0050] At the ground terminal, a MOSFET is selected as the switching device. One end of each adjustable resistor Ri is connected to the drain of the corresponding MOSFET Qi, while the source of Qi is grounded. By inputting a control signal to the gate of Qi through a driver chip, the on and off states of Qi can be precisely controlled.

[0051] By applying a specific control signal to the gate of the adjustable resistor Qi, we can achieve precise control over the on / off state of the detection switch Qi, thereby determining whether the corresponding regulated resistor circuit is conducting. By adjusting the duration of the control signal, we can control the duration of the inrush current applied to the regulated resistor, thus achieving fine adjustment of the resistance value of the regulated resistor.

[0052] Where i is the index of the resistor being adjusted, 1≤i≤n, and i is a positive integer.

[0053] Optionally, the main circuit of the adjustment circuit also includes corresponding AD sampling points. These sampling points are located between the two ends of the precision nominal resistor and between the two diodes in the measurement circuit. An appropriate AD sampling circuit is provided to convert the analog voltage signal at the sampling point into a digital signal for high-precision voltage acquisition. By measuring the voltage difference across the precision nominal resistor and combining it with its resistance value, the current value can be calculated. Because diodes are temperature sensitive, their voltage drop varies with the ambient temperature and current magnitude. Therefore, by connecting two diodes of the same specification in series, and calculating the voltage drop across the first diode, the voltage drop across the second diode can be accurately determined, thus obtaining the accurate voltage applied across the resistor being adjusted. Combining the measured current and voltage values, the resistance value of the resistor being adjusted can be calculated.

[0054] The system calculates and records the resistance value Ri of each adjusted resistor in turn, and compares it with the target resistance value. Based on the difference between the target resistance value and the target resistance value, the system automatically sets the adjustment pulse. Subsequently, the power supply is switched to the adjustment power supply through the conduction relay, and the on-time of Qi is controlled in turn using the pre-set adjustment pulse to achieve precise pulse control.

[0055] Optionally, the precision pulse is at the nanosecond level, further ensuring the accuracy and efficiency of the impedance adjustment process.

[0056] This invention proposes a pulse voltage thermistor adjustment method based on adaptive pulse width. This method achieves rapid power switching through switching devices in the main circuit, thereby efficiently completing the detection and resistance adjustment of the resistor being adjusted. Specifically, by precisely controlling the conduction time of the switching devices in the measured resistor branch, this invention can achieve high-speed and high-precision adjustment of the resistor's resistance value. This innovative method significantly shortens the time for measuring and adjusting thick-film resistors during the production of thermal printheads, while greatly improving the uniformity of the adjusted resistance, providing strong support for improving product quality and production efficiency.

[0057] Secondly, by employing an adaptive pulse width pulse voltage thermistor adjustment method, the present invention increases the thermistor qualification rate from 87% to 97%, reduces the resistance deviation from the original 30 ohms to 15 ohms, and improves the adjustment speed by 60%. Furthermore, it utilizes high-performance switching devices controlled by electrical signals, avoiding mechanical action, achieving high-precision pulse width control, and theoretically having an infinite number of conduction cycles, ensuring the equipment's durability.

[0058] The technical solution of this invention improves upon the inherent scheme of the pulse voltage thermistor adjustment method by employing adaptive pulse width, which significantly increases the adjustment speed and reduces the resistance deviation of the finished product. This reduces the production cost of thermistors, increases production efficiency, and simultaneously improves product performance.

[0059] Third, the present invention aims to solve the following technical problems existing in the prior art:

[0060] Low resistance adjustment efficiency: Traditional thermistor adjustment methods have low adjustment efficiency and long adjustment time, making it impossible to quickly reach the target resistance value.

[0061] Insufficient precision: Traditional methods have certain difficulties in achieving precise resistance values, especially when approaching the target resistance value, where the adjustment precision is not high.

[0062] Difficulty in setting pulse voltage: In traditional methods, it is difficult to adaptively adjust the pulse voltage width according to the actual situation of the resistor, resulting in an unintelligent and inefficient adjustment process.

[0063] This invention achieves the following significant technological advancements by introducing adaptive pulse width technology to intelligently adjust the pulse voltage:

[0064] Improve regulation efficiency: By adaptively adjusting the pulse voltage width based on the deviation between the current resistance value and the nominal value, the system will select a wider pulse voltage width when the difference is large, so as to increase the regulation resistance and thus greatly improve the regulation efficiency.

[0065] Improved adjustment accuracy: When the resistance value is close to the target value, the pulse voltage width will decrease accordingly, reducing the adjustment resistance and thus achieving high-precision adjustment to ensure that the resistance value accurately reaches the nominal value.

[0066] Adaptive adjustment: Using a polynomial function fitting method, the pulse voltage width is adaptively adjusted according to the change in resistance value, making the adjustment process more intelligent and automated, reducing manual intervention and complex operations.

[0067] Optimized adjustment process: During the adjustment process, the required pulse voltage width is accurately calculated by measuring the resistance value in real time and determining the corresponding functional relationship based on its range. This optimizes the adjustment process, reduces unnecessary pulse counts, and improves the overall efficiency and stability of the system.

[0068] Wide applicability: The method of this invention is applicable to various types of thermistors. Regardless of their initial resistance value, they can quickly reach the target resistance value through adaptive adjustment, and have broad application prospects. Attached Figure Description

[0069] Figure 1 This is a flowchart of a pulse voltage thermistor adjustment method based on adaptive pulse width technology provided in an embodiment of the present invention.

[0070] Figure 2 This is a block diagram of a pulse voltage thermistor adjustment system based on adaptive pulse width technology provided in an embodiment of the present invention.

[0071] Figure 3 This is a schematic diagram of the pulse waveform under different adjustment methods provided in the embodiments of the present invention.

[0072] Figure 4 This is a detailed flowchart illustrating a pulse voltage thermistor adjustment method based on adaptive pulse width provided in an embodiment of the present invention.

[0073] Figure 5 This is a schematic diagram of the circuit structure of a pulse voltage thermistor adjustment method based on adaptive pulse width provided in an embodiment of the present invention. Detailed Implementation

[0074] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0075] like Figure 1 As shown, the pulse voltage thermistor adjustment method based on adaptive pulse width technology provided by this embodiment of the invention includes the following steps:

[0076] S101 adaptively adjusts the pulse voltage width based on the deviation between the current resistance value and the nominal value;

[0077] S102, when the difference between the two is large, the system will automatically select a wider pulse voltage width to increase the resistance adjustment.

[0078] S103, when the resistance difference gradually decreases, the pulse voltage width will decrease accordingly, thus reducing the adjustment resistance.

[0079] The method for adaptively adjusting the pulse voltage width based on the deviation between the current resistance value and the nominal value provided in this embodiment of the invention is as follows:

[0080] The relationship between pulse voltage and resistance change during the nth adjustment process:

[0081] y n =f(x) n (1)

[0082] Where n≥1, y n Let x be the resistance change during the nth adjustment. n The voltage width parameter is set for the nth adjustment; R is defined. n Let the resistance value be the value after the nth adjustment. Then:

[0083] y n =R n -R n-1 (2)

[0084] From equations (1) and (2), we can obtain:

[0085] x n =f -1 (y n )=f -1 (R n -R n-1 (3)

[0086] As can be seen from equation (3), if the resistance is to be adjusted from R during the nth adjustment... n-1 Adjust to R n Then the resistance change y during the nth adjustment n Should be in R n -R n-1 That is, the applied pulse width parameter should be x. n .

[0087] Statistical analysis based on experimental data shows that the resistance value R before and after adjustment... n-1 and R n All satisfy the relation r i ≤R n ,R n-1 ≤r i-1 At this time, the relationship between the resistance change and the pulse voltage width can be fitted as a polynomial function; therefore, to adjust the resistance to the target value more quickly, the resistance value after each adjustment should be the lower bound of the resistance value of the current stage, i.e., R. n =r i The applied pulse voltage width x at this time n It can be represented as:

[0088]

[0089] Where i≥1, r i-1 and r i They respectively represent the functional relationship The upper and lower bounds of the resistance value, a i b i c i d i e i r i ≤R n-1 ≤r i-1 The coefficients of the quartic, cubic, quadratic, and linear terms, as well as the constant term;

[0090] Although a piecewise function expression can be fitted based on experimental data, there are still significant uncertainties in the pulse impedance adjustment process, and the piecewise function expression can only provide a reference. When performing the nth adjustment, it is necessary to accurately measure the resistance value R after the (n-1)th adjustment first. n-1Determine its resistance range and identify the corresponding piecewise function. Then, substituting into equation (4), the required pulse width parameter x can be calculated. n ,Right now:

[0091]

[0092] In equation (5), r i-1 and r i It conforms to the following relationship:

[0093] r0-r1>r1-r2>………>r i-1 -r i (6)

[0094] When calculating the pulse voltage pulse width at each stage using equation (5), the initial stage r i A larger R0 corresponds to a larger pulse width x1, increasing the change in resistance and thus rapidly narrowing the resistance difference. However, as pulses are continuously applied, r... i -R n-1 Gradually decrease, pulse width x n The resistance will also decrease accordingly, reducing the change in resistance to ensure the precision and accuracy of resistance adjustment. In this way, the present invention ensures both high-speed resistance adjustment and precise resistance adjustment, achieving a balance between efficiency and accuracy. This innovative method not only improves the efficiency and accuracy of resistance adjustment but also provides a brand-new solution for the resistance adjustment of thick film resistor arrays on thermal printed wafers, and has significant practical application value.

[0095] To ensure that the resistance value of a specific branch resistor can rapidly and stably approach the target nominal value during the adjustment process, an adaptive pulse voltage adjustment method based on the actual resistance value is adopted. This method mainly includes the following steps:

[0096] a. Turn on the switching device in the circuit of the resistor being adjusted, and accurately calculate and record the resistance value R of the resistor before adjustment. n-1 Calculate the deviation between the adjusted resistor and the target nominal value; when the resistance value has entered the allowable range of the target value, end the resistance adjustment to optimize the adjustment process and reduce unnecessary pulse counts; otherwise, proceed to step b.

[0097] b, based on the current resistance R n-1 Determine the corresponding functional relationship within the given interval. Calculate the pulse width x required for the controlled resistor. n ;r i -R n-1 When it is large, the pulse width x nIt is also relatively large, with a large change in resistance value, to accelerate the adjustment process of the resistance value; while when r i -R n-1 When it is small, the pulse width x n The resistance is also relatively small, resulting in a smaller change in resistance value, allowing for more precise resistance adjustment; after completing step a, execute step a again;

[0098] like Figure 2 As shown, an embodiment of the present invention provides a pulse voltage thermistor adjustment system based on adaptive pulse width technology, comprising:

[0099] An adaptive adjustment module is used to adaptively adjust the pulse voltage width based on the deviation between the current resistance value and the nominal value.

[0100] The resistance adjustment module is enlarged so that when the difference between the two is large, the system will automatically select a wider pulse voltage width to increase the resistance adjustment.

[0101] The reduced resistance adjustment module is used to reduce the pulse voltage width as the resistance difference gradually decreases, thereby reducing the resistance adjustment effect.

[0102] An embodiment of the present invention provides a computer device, the computer device including a memory and a processor, the memory storing a computer program, the computer program being executed by the processor causing the processor to perform the steps of the pulse voltage thermistor adjustment method based on adaptive pulse width technology.

[0103] The present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the steps of the pulse voltage thermistor adjustment method based on adaptive pulse width technology.

[0104] An embodiment of the present invention provides an information data processing terminal, which is used to implement the pulse voltage thermistor adjustment system based on adaptive pulse width technology.

[0105] Specific implementation of the present invention:

[0106] Figure 3 This is a schematic diagram of the pulse waveform under different adjustment methods provided in the embodiments of the present invention.

[0107] Example 1

[0108] A pulse voltage tuning method based on adaptive pulse width modulation technology includes: firstly, using a switching switch K on the main circuit to quickly switch between resistance detection and adjustment modes, ensuring stable and efficient operation of the circuit under different operating conditions; then, by sequentially activating the switching devices of each adjusted resistor branch, the adjusted resistor is detected and precisely adjusted one by one.

[0109] As an example, the switching switch K works in conjunction with the switching devices Qi on each branch of the adjustable resistor to achieve high-speed and high-precision adjustment. This includes: when the switching switch K is open, the resistance measurement power supply starts working, and the system enters resistance measurement mode. At this time, according to a predetermined adjustment sequence, by applying the same control signal to the corresponding Qi, the branch containing the adjustable resistor Ri is turned on, and then the actual resistance value is accurately calculated based on the current flowing through Ri and the voltage difference across it. When the switching switch K is closed, the resistance adjustment power supply starts working, and the system enters resistance adjustment mode. Again, according to the adjustment sequence, by applying different control signals to Qi, the pulse width of the pulse voltage across the adjustable resistor Ri is precisely controlled, thereby achieving different adjustment effects and ensuring that the resistance value of the resistor array can be quickly and smoothly adjusted to the nominal value within the allowable range.

[0110] During resistance adjustment, this invention determines the pulse width of the pulse voltage applied to the resistor being adjusted based on a piecewise function relationship between the resistance change and the applied pulse width, thereby controlling the resistance change. A larger pulse width results in a larger resistance change, while a smaller pulse width results in a smaller resistance change. This deviation-based adaptive adjustment mechanism not only improves the efficiency of resistance adjustment but also effectively reduces the resistance deviation between resistors in the adjusted resistor array, thus ensuring the uniformity of the thermal printhead resistance and the yield rate.

[0111] Specifically, for each resistor being adjusted, this invention determines and records the required pulse voltage width based on a piecewise function relationship between the resistance change and the applied pulse width. If the resistance values ​​of all resistors are within the allowable range of the target value, the operation ends; otherwise, it continues into the resistance adjustment mode for precise adjustment. In the resistance adjustment mode, the main circuit switch is turned on to connect the resistance adjustment power supply to the circuit, and the switching device Qi in the circuit of the resistor under test is controlled in turn according to the previously determined pulse width parameters. By precisely controlling the conduction time of Qi, the pulse width of the high-voltage pulse voltage across the resistor being adjusted is controlled. Thus, according to the deviation between the adjusted resistor and the target value, pulse voltages of different pulse widths are applied to achieve precise and effective adjustment of each resistor. After completing one round of resistance adjustment, the resistance measurement mode is entered again for resistance detection, and this cycle is repeated until the resistance values ​​of all adjusted resistors meet the requirements.

[0112] The entire commissioning process is as follows: Figure 4As shown, the array of adjustable resistors consists of n resistors, each numbered i (1 ≤ i ≤ n). In resistance measurement mode, the same control signal is applied to the switching device Qi in turn to ensure stable conduction. The AD sampling circuit in the main circuit accurately calculates the true resistance value of the adjustable resistor Ri. Based on the piecewise function relationship between the resistance change and the applied pulse width, the required adjustment pulse width parameter is determined and converted into a control signal for Qi. These control signals are then sent to the gate of Qi in turn, thereby achieving high-speed and high-precision resistance adjustment of the adjustable resistor Ri. After one round of resistance adjustment, the resistance measurement is performed again, and this process is repeated until the resistance values ​​of all adjustable resistors meet the requirements.

[0113] It should be noted that, in order to achieve high-speed and high-precision resistance adjustment, this invention uses a MOSFET capable of high-speed switching as the switching device Qi. By precisely controlling its conduction time, nanosecond-level control of the pulse voltage pulse width is achieved, thereby realizing precise narrow pulse adjustment. This design not only improves the speed and accuracy of resistance adjustment, but also effectively improves the resistance uniformity of the resistor array in the thermal printhead, further enhancing the product yield.

[0114] Example 2

[0115] A pulse voltage adjustment circuit based on adaptive pulse width technology is disclosed, specifically designed for resistance measurement and adjustment of a multi-channel thick-film resistor array arranged side-by-side in a thermal printhead. The circuit architecture includes key switching devices in the main circuit and independent switching devices configured for each thick-film resistor (i.e., the resistor being adjusted). One end of each resistor being adjusted is directly connected to the main circuit, while the other end is connected to the corresponding switching device, thus achieving flexible control of resistance measurement and adjustment.

[0116] With the main circuit switch open, the resistance-measuring power supply is activated. At this time, the switching devices in each branch of the resistor being adjusted are turned on in turn under program control, achieving precise measurement of the resistance value of each resistor. When the main circuit switch is closed, the resistance-adjusting power supply is connected, and the switching devices are again turned on in turn under program control, achieving precise adjustment of the resistance value. During this process, the conduction time of the switching devices directly determines the width of the pulse voltage applied to the resistor being adjusted, thereby achieving effective control over the accuracy of the resistance adjustment.

[0117] The adjustment circuit of this invention features an ingenious design, achieving flexible switching between resistance measurement and resistance adjustment power supplies through rapid switching of the main circuit switching devices. Simultaneously, precise control of the switching devices in the adjusted resistor branch enables free adjustment of the pulse voltage width, significantly shortening the resistance adjustment time and greatly improving the uniformity of the adjusted resistance. Overall, this adjustment circuit exhibits high resistance adjustment efficiency and precise resistance adjustment capability.

[0118] Taking a thermal printhead with n resistors as an example, these resistors are connected to the MOS transistor array of the resistance adjustment system through a precision positioning device. Figure 5 This paper demonstrates a high-speed, high-precision adjustment circuit based on the MOSFET pulse voltage adjustment method. The circuit includes n adjustable resistors R1 to Rn, each resistor branch equipped with a MOSFET switch Q1 to Qn. One end of all adjustable resistors converges to the main circuit, and a relay switch K is located at the main circuit power supply terminal to control the switching between the resistance measurement power supply and the resistance adjustment power supply.

[0119] In the resistance measurement and adjustment process, the main circuit switch K is first disconnected, and the resistance measurement power supply is connected. Then, control signals are sent to the MOSFET switches of each branch to achieve sequential conduction of the branches. When a branch is conducting, current flows through the precision nominal resistor in the main circuit. By acquiring analog signals at specific sampling points, the resistance value of the resistor being adjusted can be accurately calculated. Next, based on the deviation between the resistance value of the adjusted resistor and the target value, the required adjustment pulse voltage pulse width is determined. Then, the main circuit switch K is closed, the adjustment power supply is connected, and control signals are sent to the MOSFET switches of the corresponding branches according to the determined pulse width parameters to achieve precise adjustment of the resistance value of the adjusted resistor.

[0120] It is worth noting that the main circuit switch K uses a mechanical relay to ensure stable operation during the alternating conduction of branch circuit switches. Meanwhile, the branch circuit switches employ contactless, fast-opening MOSFETs to ensure stable conduction during measurement, avoid noise interference, and ensure the accuracy of resistance measurements; during adjustment, they can rapidly open and close, achieving nanosecond-level pulse voltages, thus enabling efficient and rapid adjustment of the resistance value of the resistor being adjusted.

[0121] based on Figure 5 The adjustment circuit shown describes the following process for adjusting the resistance of the thick-film resistor in the thermal printhead: First, disconnect the main circuit switch K and connect the resistance measurement power supply. Then, sequentially turn on the MOSFET switches of each branch circuit, measuring and recording the resistance value of each resistor to be adjusted. Next, compare the resistance value of each resistor with the target value, and determine the required pulse voltage width based on the deviation. If all resistance values ​​are within the allowable range, the adjustment is complete; otherwise, close the main circuit switch K, connect the resistance adjustment power supply, and according to the determined pulse width parameters, sequentially control the on-time of the MOSFET switches in each branch circuit to achieve precise adjustment of the resistance value. Repeat the measurement steps until all resistance values ​​meet the requirements.

[0122] This invention proposes a pulse voltage tuning method based on adaptive pulse width technology, which fully utilizes the superior performance of high-speed MOSFET switching devices. This switching device has an extremely short delay time of only a few nanoseconds in the branch of the resistor being tuned, Ri, thus enabling the generation of narrow tuning pulses as low as 10 nanoseconds. Its on-resistance is extremely low, only a few milliohms, and it is connected in a contactless manner, ensuring that in a properly designed circuit, without excessive current or voltage, the MOSFET can theoretically conduct an unlimited number of times, and its on-state voltage drop is negligible and remains stable.

[0123] By employing a MOSFET to achieve high-precision pulse voltage width control, this method demonstrates extremely high resistance adjustment efficiency, accuracy, and reliability. The switching switch K in the main circuit can flexibly switch between the resistance adjustment power supply and the resistance measurement power supply. By alternately controlling the on / off state of the MOSFET Qi, efficient detection or precise resistance adjustment of the resistor being adjusted can be achieved.

[0124] When the resistance measurement power supply is connected, the main circuit switch K remains stationary throughout the entire resistance measurement or adjustment process, and its function is achieved solely by sending control signals to the high-speed MOSFET in turn. This method ensures that only one resistor is adjusted or tested at a time, effectively reducing the overall workflow time and thus significantly improving the resistance adjustment efficiency.

[0125] In summary, the adaptive pulse width adjustment method provided by this invention not only ensures the high efficiency and accuracy of resistance adjustment, but also further improves the resistance adjustment efficiency by optimizing the workflow and reducing time consumption, providing a reliable solution for the resistance adjustment of the thick film resistor array of the thermal printhead.

[0126] It should be noted that embodiments of the present invention can be implemented in hardware, software, or a combination of both. The hardware portion can be implemented using dedicated logic; the software portion can be stored in memory and executed by a suitable instruction execution system, such as a microprocessor or dedicated-design hardware. Those skilled in the art will understand that the above-described devices and methods can be implemented using computer-executable instructions and / or included in processor control code, for example, such code provided on a carrier medium such as a disk, CD, or DVD-ROM, a programmable memory such as read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The devices and modules of the present invention can be implemented by hardware circuitry such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field-programmable gate arrays, programmable logic devices, etc., or by software executed by various types of processors, or by a combination of the above-described hardware circuitry and software, such as firmware.

[0127] Two specific application embodiments of the present invention are as follows:

[0128] Example 1: Thermistor Adjustment in Precision Electronic Equipment

[0129] In precision electronic equipment, thermistors are used for temperature detection and control. To ensure accurate response of the equipment at different temperatures, the thermistors need to be precisely adjusted to achieve their nominal resistance value.

[0130] Initial Measurement and Pulse Width Setting: The system first measures the current resistance of the thermistor and compares it with the target nominal value. If the current resistance differs significantly from the target value, the system will initially set a wider pulse voltage width, such as 10 milliseconds.

[0131] Adaptive Adjustment: After applying the set pulse voltage, the system measures the thermistor's resistance again. Based on the measurement result, the system calculates the difference between the resistance value and the target value. If the difference is still large, the system will continue to use a wider pulse voltage; if the difference decreases, the system will correspondingly reduce the pulse voltage width, for example, to 8 milliseconds.

[0132] Iterative adjustment: The system continuously repeats the above steps, gradually reducing the pulse voltage width until the thermistor's resistance value reaches the allowable range of the target value. For example, when the resistance difference is very small, the system may use a pulse voltage width of 5 milliseconds or less for fine-tuning.

[0133] Example 2: Thermistor Adjustment in Industrial Automation Equipment

[0134] In industrial automation equipment, thermistors are used to monitor and regulate equipment temperature, ensuring that the equipment operates within its optimal temperature range. Adaptive pulse width technology allows for rapid and precise adjustment of thermistors.

[0135] Initial measurement and pulse width setting: The system first measures the current resistance of the thermistor and compares it with the nominal value. If the resistance difference is large, the system will set a wider pulse voltage width, such as 20 milliseconds.

[0136] Adaptive adjustment: After applying a pulse voltage, the system measures the thermistor's resistance again. Based on the new resistance value, the system adjusts the pulse voltage width. If the resistance difference decreases, the pulse voltage width also decreases accordingly, for example, to 15 milliseconds.

[0137] Iterative adjustment: The system repeats measurement and adjustment steps, gradually reducing the pulse voltage width. As the resistance value gets closer to the target value, the pulse voltage width gradually decreases, ultimately ensuring that the thermistor's resistance value is within the allowable range of the target value. For example, when the difference is very small, a pulse voltage width of 10 milliseconds or less may be used for fine-tuning.

[0138] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for trimming a pulse voltage thermistor based on adaptive pulse width technique, characterized in that, The method comprises the following steps: Step one, according to the deviation between the current value and the nominal value of the resistance, the width of the pulse voltage is adaptively adjusted; Step two, when the gap between the two is large, the system will automatically select a wider pulse voltage width to increase the resistance adjusting degree; Step three, when the resistance difference gradually decreases, the pulse voltage width will be reduced accordingly, and the resistance adjusting degree will be reduced; The method of adaptively adjusting the width of the pulse voltage according to the deviation between the current value and the nominal value of the resistance is as follows: The relationship between the pulse voltage and the resistance value change in the nth adjustment process is as follows: y n = f(x n ); (1) where n≥1, y n is the resistance value change amount of the nth adjustment, x n is the voltage width parameter set for the nth adjustment; define R n is the resistance value after the nth adjustment, then: y n = R n - R n-1 ; (2) From formula (1), (2), we can get: x n = f -1 (y n ) = f -1 (R n -R n-1 ) ; (3) As can be seen from equation (3), if the resistance is to be adjusted from R during the nth adjustment... n-1 Adjust to R n Then the resistance change y during the nth adjustment n Should be in R n -R n-1 That is, the applied pulse width parameter should be x. n .

2. The pulse voltage thermistor adjustment method based on adaptive pulse width technology as described in claim 1, characterized in that, The R n-1 and R n satisfy the relationship r i ≤ R n , R n-1 ≤ r i-1 , the relationship between the resistance change amount and the pulse voltage width can be fitted as a polynomial function.

3. The pulse voltage thermistor adjustment method based on adaptive pulse width technology as described in claim 1, characterized in that, The R n = r i ; at this time the width of the applied pulse voltage x n can be expressed as: where i≥1, r i-1 and r i represent the upper and lower resistance limits, respectively, for the function a i , b i , c i , d i , e i are the fourth, third, second, first and constant coefficients, respectively, for the function when r i ≤ R n-1 ≤ r i-1 .

4. The pulse voltage thermistor adjustment method based on adaptive pulse width technology as described in claim 1, characterized in that, When the n th adjustment is made, the resistance R after the n-1 th adjustment is measured accurately n-1 , the resistance range is determined, and the corresponding piecewise function is determined Then the pulse width parameter x is calculated by substituting into equation (4) n , namely: In formula (5), r i-1 and r i comply with the following relationship: r0-r1>r1-r2>………>r i-1 -r i ； (6)。 5. The pulse voltage thermistor adjustment method based on adaptive pulse width technology as described in claim 1, characterized in that, The adaptive pulse voltage adjusting method based on the real value of the resistance comprises the following steps: a, turn on the switch device in the adjustable resistance circuit, calculate and record the resistance value R before the adjustable resistance is adjusted n-1 , calculate the deviation value between the adjustable resistance and the target nominal value; when the resistance value has entered the target value allowed range, then end the resistance adjustment work, to optimize the adjustment process and reduce the number of unnecessary pulses; otherwise, perform step b; b, according to the current resistance R n-1 interval where the resistance is located, to determine the corresponding function relationship pulse width x required by the regulated resistance n ; r i - n-1 When r is larger, the pulse width x n is also larger, and the resistance change is larger, to speed up the resistance adjustment process; when r i - n-1 is smaller, the pulse width x n is also smaller, and the resistance change is smaller; after completing the step, execute a again.

6. An adaptive pulse width based pulse voltage thermistor trimming system implementing the adaptive pulse width based pulse voltage thermistor trimming method according to any one of claims 1 to 5, characterized in that, The pulse voltage thermistor adjusting system based on the adaptive pulse width technology comprises: An adaptive adjustment module is configured to adaptively adjust the width of the pulse voltage according to the deviation between the current value and the nominal value of the resistance; An increasing resistance adjusting module is configured to automatically select a wider pulse voltage width to increase the resistance adjusting degree when the gap between the two is large; A decreasing resistance adjusting module is configured to reduce the pulse voltage width to reduce the resistance adjusting degree when the resistance difference gradually decreases.

7. A computer device, characterized by The computer device comprises a memory and a processor, and the memory stores a computer program, which is executed by the processor to make the processor execute the steps of the pulse voltage thermistor adjusting method based on the adaptive pulse width technology according to any one of claims 1-5.

8. A computer readable storage medium storing a computer program, which is executed by a processor to make the processor execute the steps of the pulse voltage thermistor adjusting method based on the adaptive pulse width technology according to any one of claims 1-5.

9. An information data processing terminal, characterized by The information data processing terminal is configured to implement the pulse voltage thermistor adjusting system based on the adaptive pulse width technology according to claim 6.

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