Printer-based DAC output high-voltage waveform control circuit

Abstract

The utility model discloses a digital-to-analog converter (DAC) output high-voltage waveform control circuit based on a printer, which comprises a digital-to-analog conversion (DAC) module, a signal amplification and filtering module, a current amplification and temperature drift stabilization module and a current amplification module. Compared with the traditional design of controlling high-voltage output by a switch, the high-voltage waveform output is controlled by adopting a DAC analog signal, so that the precision and the stability of voltage output are remarkably improved, and the printing quality problem caused by voltage fluctuation is effectively avoided; the multi-stage high-speed operational amplifier, reasonable resistor and capacitor configuration and specially selected triode pairs in the circuit not only enhance the current driving capability of signals, but also effectively suppress the influence of environment temperature change on circuit performance, and ensure high reliability and consistency in different application scenarios.

Description

Technical Field

[0001] The utility model relates to the field of printers, in particular to a DAC output high-voltage waveform control circuit based on a printer. Background Art

[0002] At present, most printer designs for high-voltage waveform control mainly apply to switch control of high-voltage output. However, this design has great defects in voltage output accuracy control. It is very difficult to achieve precise control of high-precision voltage, which can lead to instability of voltage output and affect printing quality. Summary of the Invention

[0003] The utility model provides a DAC output high-voltage waveform control circuit based on a printer to solve the above-mentioned existing technical problems.

[0004] The technical solution of the utility model is realized as follows:

[0005] A DAC output high-voltage waveform control circuit based on a printer of the utility model includes a digital-to-analog conversion DAC module, a signal amplification and filtering module, a current amplification and temperature drift stabilization module, and a current amplification module;

[0006] The digital-to-analog conversion DAC module is used to convert digital signals into corresponding analog voltage signals;

[0007] The signal amplification and filtering module receives the analog signal output by the DAC module and performs amplification and filtering processing by using a multi-stage high-speed operational amplifier;

[0008] The current amplification and temperature drift stabilization module performs two-stage current amplification through the emitter follower configuration of a triode;

[0009] The current amplification module enhances the current driving ability of the signal.

[0010] Further, the digital-to-analog conversion DAC module includes a DAC chip U1. One end of a first capacitor C10 is connected to a first pin of the DAC chip U1 through VCC, and the other end of the first capacitor C10 is connected to the ground. A second pin of the DAC chip U1 is connected to a first resistor R16. A third pin of the DAC chip U1 is connected to the ground through a second resistor R20. A fourth pin of the DAC chip U1 is connected to a seventh pin of the DAC chip U1 through a second capacitor C7. The seventh pin of the DAC chip U1 is also connected to the ground through a third capacitor C9. One end of the third capacitor C9 is also connected to the -5V terminal of the power supply. A fifth pin of the DAC chip U1 is connected to a sixth pin of the DAC chip U1 through the ground. The sixth pin of the DAC chip U1 is connected to a third pin of an operational amplifier U2A. The eighth pin of the DAC chip U1 is connected to a second pin of the operational amplifier U2A. The ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth pins of the DAC chip U1 are connected to a bus.

[0011] Further, the signal amplification and filtering module includes an operational amplifier U2A. A fourth pin of the operational amplifier U2A is connected to the -5V terminal of the power supply. An eighth pin of the operational amplifier U2A is connected to the VCC terminal. A first pin of the operational amplifier U2A is connected to a second pin of the operational amplifier U2A through a third resistor R15. The first pin of the operational amplifier U2A is also connected to a sixth pin of an operational amplifier U2B through a fourth resistor R19. A fifth pin of the operational amplifier U2B is connected to one end of a fifth resistor R26. A seventh pin of the operational amplifier U2B is connected to a sixth resistor R17 through a fourth capacitor C5. The sixth resistor R17 is connected to the sixth pin of the operational amplifier U2B.

[0012] Further, the current amplification and temperature drift stabilization module includes a first triode Q5. The base of the first triode Q5 is connected to the signal amplification and filtering module through a sixth resistor R21, and the base of the first triode Q5 is connected to the base of a second triode Q3 through a seventh resistor R18. The collector of the first triode Q5 is connected to the seventh resistor R18, and the collector of the first triode Q5 is also connected to the current amplification module. The emitter of the first triode Q5 is respectively connected to one end of a fifth capacitor C8 and an eighth resistor R24. The other ends of the fifth capacitor C8 and the eighth resistor R24 are both connected to the -5V terminal of the power supply. The base of the second triode Q3 is also connected to the base of a third triode Q6, and the emitter of the second triode Q3 is connected to the emitter of the third triode Q6. The collector of the third triode Q6 is also connected to the -5V terminal of the power supply. The emitter of the third triode Q6 is also connected to a ninth resistor R25 through an eighth resistor R23. The ninth resistor R25 is connected to the ground through a tenth resistor R27. One end of the tenth resistor R27 is also connected to the other end of a fifth resistor R26. One end of the eighth resistor R23 is also connected to one end of an eleventh resistor R22 and a sixth capacitor C6. The other ends of the eleventh resistor R22 and the sixth capacitor C6 are also connected to the base of a fourth triode Q4. The base of the fourth triode Q4 is also connected to the base of a fifth triode Q7. The emitters of the fourth triode Q4 and the fifth triode Q7 are both connected to COM1. The collector of the fifth triode Q7 is also connected to the ground.

[0013] Further, the current amplification module includes a sixth triode Q2. The base of the sixth triode Q2 is connected to the in terminal through a twelfth resistor R5. One end of the twelfth resistor R5 is also connected to one end of a thirteenth resistor R6. The emitter of the sixth triode Q2 is connected to the other end of the thirteenth resistor R6. The other end of the thirteenth resistor R6 is also connected to the ground. The other end of the thirteenth resistor R6 is also connected to the ground. The collector of the sixth triode Q2 is connected to the base of a seventh triode Q1 through a fourteenth resistor R4. The base of the seventh triode Q1 is also connected to one end of a fifteenth resistor R3 through a first diode D2. The other end of the fifteenth resistor R3 is connected to the emitter of the seventh triode Q1. One end of the fifteenth resistor R3 is also connected to one end of a seventh capacitor C1. One end of the seventh capacitor C1 is also connected to the collector of a second triode Q3. One end of the seventh capacitor C1 is also connected to one end of an eighth capacitor C2. The other ends of the seventh capacitor C1 and the eighth capacitor C2 are both connected to the ground. One end of the eighth capacitor C2 is also connected to a second diode D1 through a fifteenth resistor R1. The second diode D1 is also connected to the collector of a fourth triode Q4. The second diode D1 is also connected to one end of a ninth capacitor C3 through a sixteenth resistor R2. One end of the ninth capacitor C3 is also connected to one end of a tenth capacitor C4 and the 130V power supply terminal respectively. The other ends of the ninth capacitor C3 and the tenth capacitor C4 are also connected to the ground.

[0014] Further, the COM1 is a nozzle drive signal; the ninth capacitor C3 and the tenth capacitor C4 are power supply filter capacitors; the sixteenth resistor R2 is a self - recovering fuse, providing over - current protection for the circuit; the sixth resistor R21 and the eleventh resistor R22 are current - limiting resistors for the base of the triode.

[0015] Further, the second diode D1 is a rectifier diode, forming an RC filter circuit with the fifteenth resistor R1, the seventh capacitor C1 and the eighth capacitor C2 to filter out the ripple on the power supply and ensure the integrity of the signal; the first diode D2 is a zener diode, the seventh triode Q1 is a PNP triode; the sixth triode Q2 is an NPN triode, accepting a control signal to turn on the seventh triode Q1; the first triode Q5 is a voltage - amplifying triode; the second triode Q3 and the third triode Q6 are low - power complementary transistors, and the fourth triode Q4 and the fifth triode Q7 are high - power complementary transistors.

[0016] Further, the DAC chip U1 is an 8 - bit high - speed DAC, converting the transmitted digital signal into an analog signal to drive the nozzle; the operational amplifier U2 is an AD8056 high - speed operational amplifier.

[0017] Beneficial effects:

[0018] Through a carefully designed digital-to-analog conversion DAC module, signal amplification and filtering module, current amplification and temperature drift stabilization module, and current amplification module, precise control and driving of the printer nozzle are achieved. Compared with the traditional switch control high-voltage output design, the present utility model uses a DAC analog signal to control the high-voltage waveform output, significantly improving the accuracy and stability of the voltage output, effectively avoiding printing quality problems caused by voltage fluctuations. In addition, the multi-stage high-speed operational amplifiers, reasonable resistor-capacitor configuration, and specially selected triode pairs in the circuit not only enhance the current driving ability of the signal but also effectively suppress the influence of ambient temperature changes on the circuit performance, ensuring high reliability and consistency in different application scenarios. The circuit design of the present utility model maintains high precision while having good temperature drift stability and current driving performance, meeting the strict requirements of modern printers for high-voltage waveform control and improving printing efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the circuit framework of the present utility model;

[0020] Figure 2 is a schematic diagram of the circuit of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] As Figure 1 - Figure 2 shown, a DAC output high-voltage waveform control circuit based on a printer of the present utility model includes a digital-to-analog conversion DAC module, a signal amplification and filtering module, a current amplification and temperature drift stabilization module, and a current amplification module;

[0022] The digital-to-analog conversion DAC module is used to convert digital signals into corresponding analog voltage signals;

[0023] The signal amplification and filtering module receives the analog signal output by the DAC module and performs amplification and filtering processing on it. By using multi-stage high-speed operational amplifiers, the signal amplitude is increased, and at the same time, the noise and unwanted frequency components in the signal are filtered out to ensure the purity of the signal;

[0024] The current amplification and temperature drift stabilization module performs two-stage current amplification through the emitter follower configuration of triodes to provide sufficient driving ability for the nozzle, and uses the complementary configuration of paired tubes to effectively suppress the influence of ambient temperature changes on the signal stability, ensuring the accuracy and reliability of the signal output;

[0025] The current amplification module enhances the current driving ability of the signal to ensure that the signal can drive high-load devices such as printer nozzles.

[0026] Further, the digital-to-analog conversion DAC module includes a DAC chip U1. One end of a first capacitor C10 is connected to the first pin of the DAC chip U1 through VCC, and the other end of the first capacitor C10 is connected to the ground. The second pin of the DAC chip U1 is connected to a first resistor R16. The third pin of the DAC chip U1 is connected to the ground through a second resistor R20. The fourth pin of the DAC chip U1 is connected to the seventh pin of the DAC chip U1 through a second capacitor C7. The seventh pin of the DAC chip U1 is also connected to the ground through a third capacitor C9. One end of the third capacitor C9 is also connected to the -5V terminal of the power supply. The fifth pin of the DAC chip U1 is connected to the sixth pin of the DAC chip U1 through the ground. The sixth pin of the DAC chip U1 is connected to the third pin of an operational amplifier U2A. The eighth pin of the DAC chip U1 is connected to the second pin of the operational amplifier U2A. The ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth pins of the DAC chip U1 are connected to a bus.

[0027] Further, the signal amplification and filtering module includes an operational amplifier U2A. The fourth pin of the operational amplifier U2A is connected to the -5V terminal of the power supply. The eighth pin of the operational amplifier U2A is connected to the VCC terminal. The first pin of the operational amplifier U2A is connected to the second pin of the operational amplifier U2A through a third resistor R15. The first pin of the operational amplifier U2A is also connected to the sixth pin of an operational amplifier U2B through a fourth resistor R19. The fifth pin of the operational amplifier U2B is connected to one end of a fifth resistor R26. The seventh pin of the operational amplifier U2B is connected to a sixth resistor R17 through a fourth capacitor C5. The sixth resistor R17 is connected to the sixth pin of the operational amplifier U2B.

[0028] Further, the current amplification and temperature drift stabilization module includes a first triode Q5. The base of the first triode Q5 is connected to the signal amplification and filtering module through a sixth resistor R21, and the base of the first triode Q5 is connected to the base of a second triode Q3 through a seventh resistor R18. The collector of the first triode Q5 is connected to the seventh resistor R18, and the collector of the first triode Q5 is also connected to the current amplification module. The emitter of the first triode Q5 is respectively connected to one end of a fifth capacitor C8 and an eighth resistor R24. The other ends of the fifth capacitor C8 and the eighth resistor R24 are both connected to the -5V terminal of the power supply. The base of the second triode Q3 is also connected to the base of a third triode Q6, and the emitter of the second triode Q3 is connected to the emitter of the third triode Q6. The collector of the third triode Q6 is also connected to the -5V terminal of the power supply. The emitter of the third triode Q6 is also connected to a ninth resistor R25 through an eighth resistor R23. The ninth resistor R25 is connected to the ground through a tenth resistor R27. One end of the tenth resistor R27 is also connected to the other end of a fifth resistor R26. One end of the eighth resistor R23 is also connected to one end of an eleventh resistor R22 and a sixth capacitor C6. The other ends of the eleventh resistor R22 and the sixth capacitor C6 are also connected to the base of a fourth triode Q4. The base of the fourth triode Q4 is also connected to the base of a fifth triode Q7. The emitters of the fourth triode Q4 and the fifth triode Q7 are both connected to COM1. The collector of the fifth triode Q7 is also connected to the ground.

[0029] Further, the current amplification module includes a sixth triode Q2. The base of the sixth triode Q2 is connected to the in terminal through a twelfth resistor R5. One end of the twelfth resistor R5 is also connected to one end of a thirteenth resistor R6. The emitter of the sixth triode Q2 is connected to the other end of the thirteenth resistor R6. The other end of the thirteenth resistor R6 is also connected to the ground. The other end of the thirteenth resistor R6 is also connected to the ground. The collector of the sixth triode Q2 is connected to the base of a seventh triode Q1 through a fourteenth resistor R4. The base of the seventh triode Q1 is also connected to one end of a fifteenth resistor R3 through a first diode D2. The other end of the fifteenth resistor R3 is connected to the emitter of the seventh triode Q1. One end of the fifteenth resistor R3 is also connected to one end of a seventh capacitor C1. One end of the seventh capacitor C1 is also connected to the collector of a second triode Q3. One end of the seventh capacitor C1 is also connected to one end of an eighth capacitor C2. The other ends of the seventh capacitor C1 and the eighth capacitor C2 are both connected to the ground. One end of the eighth capacitor C2 is also connected to a second diode D1 through a fifteenth resistor R1. The second diode D1 is also connected to the collector of a fourth triode Q4. The second diode D1 is also connected to one end of a ninth capacitor C3 through a sixteenth resistor R2. One end of the ninth capacitor C3 is also connected to one end of a tenth capacitor C4 and the 130V power supply terminal respectively. The other ends of the ninth capacitor C3 and the tenth capacitor C4 are also connected to the ground.

[0030] Further, the COM1 is a nozzle drive signal; the ninth capacitor C3 and the tenth capacitor C4 are power supply filter capacitors; the sixteenth resistor R2 is a self - restoring fuse, providing over - current protection for the circuit; the sixth resistor R21 and the eleventh resistor R22 are current - limiting resistors for the base of the triode.

[0031] Further, the second diode D1 is a rectifier diode, which forms an RC filter circuit with the fifteenth resistor R1, the seventh capacitor C1 and the eighth capacitor C2 to filter out the ripple on the power supply and ensure the integrity of the signal; the first diode D2 is a zener diode, the seventh triode Q1 is a PNP triode; the sixth triode Q2 is an NPN triode, accepting a control signal to turn on the seventh triode Q1; the first triode Q5 is a voltage - amplifying triode; the second triode Q3 and the third triode Q6 are low - power complementary transistors, and the fourth triode Q4 and the fifth triode Q7 are high - power complementary transistors.

[0032] Further, the DAC chip U1 is an 8 - bit high - speed DAC, which converts the transmitted digital signal into an analog signal to drive the nozzle; the operational amplifier U2 is an AD8056 high - speed operational amplifier.

[0033] Working principle:

[0034] The digital-to-analog conversion DAC module uses bus transmission to receive digital signals from the FPGA and convert them into analog quantities of corresponding levels. The small-signal analog quantity is filtered and amplified by two-stage high-speed operational amplifiers. The eighth resistor R23, the ninth resistor R25, the fifth resistor R26, and the tenth resistor R27 form a signal output feedback network to configure the amplification factor of the AD8056. When the base of the sixth triode Q2 receives a signal from the control terminal, it conducts, and then pulls down the base potential of the seventh triode Q1 through the fourteenth resistor R4. There is current passing through the emitter junction of the seventh triode Q1, and the triode conducts. The first diode D2 is a zener diode that clamps the voltage across the emitter junction of the seventh triode Q1 to remain unchanged. The first diode D2 and the seventh triode Q1 together form a current stabilization circuit that is not affected by power supply fluctuations and provides a constant operating current for the first triode Q5 to stabilize the amplification factor of the first triode Q5. The low-voltage signal output by the operational amplifier enters the base of the first triode Q5 through the sixth resistor R21 and is output from the collector. The low-voltage signal is converted into a small current signal of high voltage. The first triode Q5 is connected in the common-emitter amplifier circuit configuration, with the signal input from the base of the triode and output from the collector. The phase of the input and output is opposite. The second triode Q3, the third triode Q6, the fifth triode Q7, and the fourth triode Q4 are amplified in the emitter-follower mode, only amplifying the current and not the voltage. The phase of the input and output is the same. The signal enters and undergoes two-stage current amplification to drive the nozzle. The second triode Q3, the third triode Q6, the fifth triode Q7, and the fourth triode Q4 use the complementary pair configuration to effectively suppress the temperature drift phenomenon caused by environmental temperature changes, thus ensuring the accuracy of the analog quantity output of the DA conversion signal.

[0035] Working process: The precise conversion and stable amplification from digital signals to analog signals are achieved through multiple key modules with fine design. The system first utilizes the DAC chip U1 in the digital-to-analog conversion DAC module. This chip receives digital signals from the FPGA through its multi-pin configuration and converts them into corresponding analog voltage signals. These signals are then sent to the signal amplification and filtering module, where the high-speed operational amplifiers U2A and U2B are used for small-signal amplification and filtering of the signals to increase the signal amplitude and filter out noise.

[0036] The amplified and filtered signals enter the current amplification and temperature drift stabilization module, where the first triode Q5 and other triodes (Q3, Q6, Q7, Q4) work together to perform two-stage current amplification through the emitter-follower configuration. At the same time, the complementary pair configuration is used to effectively suppress the temperature drift phenomenon caused by environmental temperature changes, ensuring the accuracy and reliability of the signal output. In addition, the sixth triode Q2 in the current amplification module further enhances the current driving ability of the signal to ensure that the signal can drive high-load devices such as printer nozzles.

[0037] In the circuit design, overcurrent protection components such as the sixteenth resistor R2 are also included, as well as the power filter capacitors, the ninth capacitor C3 and the tenth capacitor C4, to ensure the stable operation of the circuit under power fluctuations. The rectifier diode D1 and the RC filter circuit composed of resistors and capacitors further filter out the ripples on the power supply, providing guarantee for the integrity of the signal. The current stabilizing circuit composed of the zener diode D2 and the seventh triode Q1 provides a constant operating current for the first triode Q5, stabilizing its amplification factor. The design of the entire system not only focuses on the accuracy and stability of signal conversion, but also takes into account the safety and long-term reliability of the circuit. Through the close cooperation of each module, precise high-voltage waveform control of the printer nozzle is achieved, thus significantly improving the printing quality and efficiency.

Claims

1. A DAC output high voltage waveform control circuit based on a printer, characterized in that: It includes a digital-to-analog conversion DAC module, a signal amplification and filtering module, a current amplification and temperature drift stabilization module, and a current amplification module; The digital-to-analog conversion DAC module is used to convert the digital signal into a corresponding analog voltage signal; The signal amplification and filtering module receives the analog signal output by the DAC module and performs amplification and filtering processing by using a multi-stage high-speed operational amplifier; The current amplification and temperature drift stabilization module performs two-stage current amplification through an emitter follower configuration of a triode; The current amplification module enhances the current driving capability of the signal.

2. The DAC output high voltage waveform control circuit based on a printer according to claim 1, characterized in that: The digital-to-analog conversion DAC module includes a DAC chip U1, a first pin of the DAC chip U1 is connected to one end of a first capacitor C10 through VCC, the other end of the first capacitor C10 is connected to the ground, a second pin of the DAC chip U1 is connected to a first resistor R16, a third pin of the DAC chip U1 is connected to the ground through a second resistor R20, a fourth pin of the DAC chip U1 is connected to a seventh pin of the DAC chip U1 through a second capacitor C7, the seventh pin of the DAC chip U1 is also connected to the ground through a third capacitor C9, one end of the third capacitor C9 is also connected to a -5V end of a power supply, a fifth pin of the DAC chip U1 is connected to a sixth pin of the DAC chip U1 through the ground, the sixth pin of the DAC chip U1 is connected to a third pin of an operational amplifier U2A, an eighth pin of the DAC chip U1 is connected to a second pin of the operational amplifier U2A, and a ninth pin, a tenth pin, an eleventh pin, a twelfth pin, a thirteenth pin, a fourteenth pin, a fifteenth pin and a sixteenth pin of the DAC chip U1 are connected to a bus.

3. The DAC output high voltage waveform control circuit based on a printer according to claim 1, characterized in that: The signal amplification and filtering module includes an operational amplifier U2A, a fourth pin of the operational amplifier U2A is connected to the -5V end of the power supply, an eighth pin of the operational amplifier U2A is connected to the VCC end, a first pin of the operational amplifier U2A is connected to the second pin of the operational amplifier U2A through a third resistor R15, the first pin of the operational amplifier U2A is also connected to the sixth pin of the operational amplifier U2B through a fourth resistor R19, a fifth pin of the operational amplifier U2B is connected to one end of a fifth resistor R26, a seventh pin of the operational amplifier U2B is connected to a sixth resistor R17 through a fourth capacitor C5, and the sixth resistor R17 is connected to the sixth pin of the operational amplifier U2B.

4. The DAC output high voltage waveform control circuit based on a printer according to claim 1, characterized in that: The current amplification and temperature drift stabilization module includes a first transistor Q5, the base of the first transistor Q5 is connected to the signal amplification and filtering module through a sixth resistor R21, the base of the first transistor Q5 is connected to the base of the second transistor Q3 through a seventh resistor R18, the collector of the first transistor Q5 is connected to the seventh resistor R18, the collector of the first transistor Q5 is also connected to the current amplification module, the emitter of the first transistor Q5 is respectively connected to one end of a fifth capacitor C8 and an eighth resistor R24, the other ends of the fifth capacitor C8 and the eighth resistor R24 ​​are both connected to the -5V end of the power supply, the base of the second transistor Q3 is also connected to the base of the third transistor Q6, the emitter of the second transistor Q3 is connected to the emitter of the third transistor Q6 The collector of the third triode Q6 is also connected to the -5V end of the power supply, the emitter of the third triode Q6 is also connected to the ninth resistor R25 through the eighth resistor R23, the ninth resistor R25 is connected to the ground through the tenth resistor R27, one end of the tenth resistor R27 is also connected to the other end of the fifth resistor R26, one end of the eighth resistor R23 is also connected to the eleventh resistor R22 and one end of the sixth capacitor C6, the other ends of the eleventh resistor R22 and the sixth capacitor C6 are also connected to the base of the fourth triode Q4, the base of the fourth triode Q4 is also connected to the base of the fifth triode Q7, the emitter of the fourth triode Q4 and the emitter of the fifth triode Q7 are both connected to COM1, and the collector of the fifth triode Q7 is also connected to the ground.

5. The DAC output high voltage waveform control circuit based on a printer according to claim 4, characterized in that: The current amplification module includes a sixth transistor Q2, the base of the sixth transistor Q2 is connected to the in terminal through a twelfth resistor R5, one end of the twelfth resistor R5 is also connected to one end of a thirteenth resistor R6, the emitter of the sixth transistor Q2 is connected to the other end of the thirteenth resistor R6, the other end of the thirteenth resistor R6 is also connected to the ground, the other end of the thirteenth resistor R6 is also connected to the ground, the collector of the sixth transistor Q2 is connected to the base of the seventh transistor Q1 through a fourteenth resistor R4, the base of the seventh transistor Q1 is also connected to one end of a fifteenth resistor R3 through a first diode D2, the other end of the fifteenth resistor R3 is connected to the emitter of the seventh transistor Q1, and the fifteenth resistor R 3 is also connected to one end of the seventh capacitor C1, one end of the seventh capacitor C1 is also connected to the collector of the second triode Q3, one end of the seventh capacitor C1 is also connected to one end of the eighth capacitor C2, the other ends of the seventh capacitor C1 and the eighth capacitor C2 are both connected to the ground, one end of the eighth capacitor C2 is also connected to the second diode D1 through the fifteenth resistor R1, the second diode D1 is also connected to the collector of the fourth triode Q4, the second diode D1 is also connected to one end of the ninth capacitor C3 through the sixteenth resistor R2, one end of the ninth capacitor C3 is also connected to one end of the tenth capacitor C4 and the power supply 130V end respectively, and the other ends of the ninth capacitor C3 and the tenth capacitor C4 are also connected to the ground.

6. The DAC output high voltage waveform control circuit based on a printer according to claim 4, characterized in that: The COM1 is the nozzle driving signal; the ninth capacitor C3 and the tenth capacitor C4 are power supply filter capacitors; the sixteenth resistor R2 is a self-recovering fuse to provide overcurrent protection for the circuit; the sixth resistor R21 and the eleventh resistor R22 are current limiting resistors of the base of the triode.

7. The DAC output high voltage waveform control circuit based on a printer according to claim 5, characterized in that: The second diode D1 is a rectifier diode, which forms an RC filter circuit with the fifteenth resistor R1, the seventh capacitor C1 and the eighth capacitor C2 to filter out the ripple on the power supply and provide protection for the integrity of the signal; the first diode D2 is a voltage-stabilizing diode, and the seventh transistor Q1 is a PNP transistor; the sixth transistor Q2 is an NPN transistor, which receives a control signal to turn on the seventh transistor Q1; the first transistor Q5 is a voltage-amplifying transistor; the second transistor Q3 and the third transistor Q6 are a pair of low-power transistors, and the fourth transistor Q4 and the fifth transistor Q7 are a pair of high-power transistors.

8. The DAC output high voltage waveform control circuit based on a printer according to claim 2, characterized in that: The DAC chip U1 is an 8-bit high-speed DAC, which converts the transmitted digital signal into an analog signal output to drive the nozzle; the operational amplifier U2 is an AD8056 high-speed operational amplifier.

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