Printer nozzle detection circuit

Abstract

The utility model discloses a printer nozzle detection circuit, and relates to the technical field of printers. According to the utility model, VPPIN for high-voltage power supply, 3V3HEAD for logic voltage power supply, COMAHEAD1 and COMBHEAD1 of a waveform channel and VBS1 for simulating ground reference voltage are accurately controlled, and the voltage level is monitored by using elements such as a resistor, a voltage-regulator tube and a comparator, so that the problem of short circuit or electric leakage caused by wrong connection of interface signals of a nozzle mentioned in the background technology is solved; therefore, the nozzle is protected from being damaged, the reliability of the nozzle is improved, the service life of the nozzle is prolonged, the printing quality and efficiency are ensured, the replacement cost is reduced, the downtime is shortened, a printer can continue to work even if part of nozzles break down, and the utilization rate and the printing effect of the nozzle are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, in particular to a printer nozzle detection circuit. Background Art

[0002] The print head is an indispensable device for inkjet printers, and it is a relatively expensive device. However, the print head is also a relatively fragile device. Once the interface signal is connected incorrectly, resulting in a short circuit or leakage between the high-voltage signal and the logic signal, the print head will be burned out. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the utility model provides a printer nozzle detection circuit.

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

[0005] A printer nozzle detection circuit includes a nozzle high-voltage power supply module, a nozzle logic voltage power supply module, a nozzle waveform channel module and a reference voltage module;

[0006] The nozzle high-voltage power supply module includes VPP_IN, which is used to provide high-voltage power to the nozzle and drive the nozzle's spraying mechanism;

[0007] The printhead logic voltage power supply module includes 3V3_HEAD, which provides 3.3V voltage to the logic circuit in the printhead for controlling the electrospray operation of the printhead, and contains a microcontroller or driver chip;

[0008] The nozzle waveform channel module includes COMA_HEAD1 and COMB_HEAD1. COMA_HEAD1 is used for the waveform output channel of the nozzle drive signal. COMB_HEAD1 is responsible for another set of nozzle waveform output signals, which are used to control the operation of multiple nozzles. Different voltage and time control signals are generated according to the nozzle waveforms output by COMA_HEAD1 and COMB_HEAD1 to drive the nozzle to spray ink;

[0009] The reference voltage module includes VBS1, which is the reference voltage of the printhead and provides a voltage reference for the logic and analog parts of the printhead; it is used to stabilize the working environment of the printhead circuit.

[0010] Further, the VPP IN2 is connected with one end of resistor R493 and the other end of resistor R492, the other end of resistor R492 is also connected with the ground, one end of resistor R492 is also connected with the ground through voltage stabilizing tube D124, voltage stabilizing tube D124 is also connected with the third pin of comparator U1A, the second pin of comparator U1A is connected with the ground through resistor R489, the second pin of comparator U1A is also connected with 3V3_F through resistor R488, the fourth pin of comparator U1A is connected with the ground, the eighth pin of comparator U1A is connected with the ground through capacitor C2, capacitor C2 is also connected with 3V3_F, the first pin of comparator U1A is connected with 3V3_F through resistor R491, resistor R491 is also connected with CHECK VPP through resistor R490.

[0011] Further, the 3V3 HEAD is connected with one end of resistor R527 and the other end of resistor R526, the other end of resistor R526 is also connected with the ground, one end of resistor R526 is also connected with the ground through voltage stabilizing tube D170, voltage stabilizing tube D170 is also connected with the fifth pin of comparator U56B, the sixth pin of comparator U56B is connected with the ground through resistor R517, the sixth pin of comparator U56B is also connected with 3V3_F through resistor R518, the seventh pin of comparator U56B is connected with 3V3_F through resistor R525, resistor R525 is also connected with CHECK 3V3 HEAD through resistor R528.

[0012] Further, the COMA HEAD1 is connected with one end of resistor R299 and the other end of resistor R286, the other end of resistor R286 is also connected with the ground, one end of resistor R286 is also connected with the ground through voltage stabilizing tube D117, voltage stabilizing tube D117 is also connected with the ninth pin of comparator U41C, the fourteenth pin of comparator U41C is connected with 3V3_F through resistor R309, resistor R309 is also connected with CHECK COMA HEAD1 through resistor R298.

[0013] Further, the COMB HEAD1 is connected with one end of resistor R312 and the other end of resistor R292, the other end of resistor R292 is also connected with the ground, one end of resistor R292 is also connected with the ground through voltage stabilizing tube D115, voltage stabilizing tube D115 is also connected with the eleventh pin of comparator U41D, the thirteenth pin of comparator U41D is connected with 3V3_F through resistor R307, resistor R307 is also connected with CHECK COMB HEAD1 through resistor R295.

[0014] Further, the VBS1 is connected with the resistor R480 through the resistor R479, one end of the resistor R480 is also connected with the ground, one end of the resistor R480 is also connected with the ground through the voltage stabilizing tube D5, the voltage stabilizing tube D5 is also connected to the fifth pin of the comparator U57B, the second pin of the comparator U57B is connected with 3V3_F through the resistor R483, and the resistor R483 is also connected with DET_VBS through the resistor R484.

[0015] The utility model has the advantages of:

[0016] By accurately controlling the high-voltage power supply VPP_IN, the logic voltage power supply 3V3_HEAD, the COMA_HEAD1 and COMB_HEAD1 of the waveform channel and the analog ground reference voltage VBS1, and monitoring the voltage level by using resistors, voltage stabilizing tubes and comparators, the short circuit or electric leakage problem caused by the interface signal connection error of the nozzle in the background technology is solved, thereby protecting the nozzle from being damaged, improving the reliability and service life of the nozzle, ensuring the printing quality and efficiency, reducing the replacement cost and downtime, enabling the printer to continue to work even when part of the nozzle fails, and significantly improving the utilization rate and printing effect of the nozzle. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is one of the circuit design drawings of the utility model;

[0018] Figure 2 is the second circuit design drawing of the utility model. DETAILED DESCRIPTION

[0019] As shown in Figure 1-2 the utility model discloses a printer nozzle detection circuit, comprising

[0020] The nozzle high-voltage power supply module comprises VPP_IN and is used for providing high-voltage power for the nozzle, driving the ejection mechanism of the nozzle, ensuring sufficient current and voltage to start the ejection process, and enabling the nozzle of the nozzle to release ink and perform accurate ejection operation. It is used for ensuring the normal ejection work of the nozzle and avoiding ejection failure or poor quality caused by power supply problems.

[0021] The nozzle logic voltage power supply module comprises 3V3_HEAD and provides 3.3V voltage for the logic circuit in the nozzle, is used for controlling the electric ejection operation of the nozzle, and comprises a microcontroller or a driving chip. It ensures the normal operation of the control part of the nozzle, so that the ejection accuracy and timing of each nozzle can be accurately controlled.

[0022] The nozzle waveform channel module includes COMA_HEAD1 and COMB_HEAD1. COMA_HEAD1 is used for the waveform output channel of the nozzle drive signal, and COMB_HEAD1 is responsible for another set of nozzle waveform output signals used to control the operation of multiple nozzles. Based on the nozzle waveforms output by COMA_HEAD1 and COMB_HEAD1, different voltage and time control signals are generated to drive the nozzle to eject ink; this is used to ensure the accuracy of the nozzle's ejection waveform. Abnormal waveforms can cause unstable nozzle ejection, affecting the printing effect and even causing blockage. Ensure that multiple waveform channels work together to achieve the best ejection effect. If there is a problem with one waveform channel, it will affect the overall print quality.

[0023] The reference voltage module, including VBS1, is the reference voltage of the printhead and provides a voltage reference for the logic and analog parts of the printhead. It is used to stabilize the working environment of the printhead circuit, avoid the impact of noise and unstable voltage on the printhead, provide a stable voltage foundation for each circuit module of the printhead, ensure precise signal and voltage control, and thus ensure long-term stable operation of the printhead.

[0024] Furthermore, the VPP_IN2 is connected to one end of the resistor R492 through the resistor R493, the other end of the resistor R492 is also connected to the ground, one end of the resistor R492 is also connected to the ground through the voltage regulator D124, the voltage regulator D124 is also connected to the third pin of the comparator U1A, the second pin of the comparator U1A is connected to the ground through the resistor R489, the second pin of the comparator U1A is also connected to 3V3_F through the resistor R488, the fourth pin of the comparator U1A is connected to the ground, the eighth pin of the comparator U1A is connected to the ground through the capacitor C2, the capacitor C2 is also connected to 3V3_F, the first pin of the comparator U1A is connected to 3V3_F through the resistor R491, and the resistor R491 is also connected to CHECK_VPP through the resistor R490.

[0025] Furthermore, the 3V3_HEAD is connected to one end of the resistor R526 through the resistor R527, the other end of the resistor R526 is also connected to the ground, one end of the resistor R526 is also connected to the ground through the voltage regulator D170, the voltage regulator D170 is also connected to the fifth pin of the comparator U56B, the sixth pin of the comparator U56B is connected to the ground through the resistor R517, the sixth pin of the comparator U56B is also connected to 3V3_F through the resistor R518, the seventh pin of the comparator U56B is connected to 3V3_F through the resistor R525, and the resistor R525 is also connected to CHECK_3V3_HEAD through the resistor R528.

[0026] Further, the COMA HEAD1 is connected with one end of the resistor R299 and the other end of the resistor R286, the other end of the resistor R286 is also connected with the ground, one end of the resistor R286 is also connected with the ground through the voltage stabilizing tube D117, the voltage stabilizing tube D117 is also connected with the ninth pin of the comparator U41C, the fourteenth pin of the comparator U41C is connected with 3V3_F through the resistor R309, the resistor R309 is also connected with CHECK_COMA_HEAD1 through the resistor R298.

[0027] Further, the COMB HEAD1 is connected with one end of the resistor R312 and one end of the resistor R292, the other end of the resistor R292 is also connected with the ground, one end of the resistor R292 is also connected with the ground through the voltage stabilizing tube D115, the voltage stabilizing tube D115 is also connected with the eleventh pin of the comparator U41D, the thirteenth pin of the comparator U41D is connected with 3V3_F through the resistor R307, the resistor R307 is also connected with CHECK_COMB_HEAD1 through the resistor R295.

[0028] Further, the VBS1 is connected with one end of the resistor R479 and one end of the resistor R480, the other end of the resistor R480 is also connected with the ground, one end of the resistor R480 is also connected with the ground through the voltage stabilizing tube D5, the voltage stabilizing tube D5 is also connected with the fifth pin of the comparator U57B, the second pin of the comparator U57B is connected with 3V3_F through the resistor R483, the resistor R483 is also connected with DET_VBS through the resistor R484.

[0029] Wherein, VPP_IN is the high voltage power supply of the nozzle; 3V3_HEAD is the logic voltage power supply of the nozzle; U1A and U56B are comparators of LM393; U41C, U41D and U57B are comparators of LM339; 3V3_F is the system logic power supply; COMA_HEAD1 and COMB_HEAD1 are the waveform channel A of the nozzle and the waveform channel B of the nozzle; VREF1 is the reference of the comparator; D124, D170, D117, D115 and D5 are 3.3V voltage stabilizing tubes of BZT52C3V3; VBS1 is the reference voltage of the analog ground of the nozzle.

[0030] The present embodiment is based on the precise control and management of the high voltage power supply (VPP_IN) for the printhead, the logic voltage power supply (3V3_HEAD), the waveform channels (COMA_HEAD1 and COMB_HEAD1), and the analog ground reference voltage (VBS1). Through these modules, the circuit can ensure that the printhead works under the correct voltage and waveform signals, thereby driving the ejection mechanism of the printhead and achieving precise ink ejection. The high voltage power supply module provides the necessary current and voltage for the printhead to start the ejection process, while the logic voltage power supply module ensures that the control circuit of the printhead, including the microcontroller or driver chip, can function normally to control the ejection accuracy and timing of each nozzle. The waveform channel module is responsible for outputting the printhead drive signal waveform that controls the operation of multiple nozzles, generating different voltage and time control signals to drive the printhead to eject ink and ensure the accuracy of the ejection waveform, which is crucial for ensuring the printing effect and long-term stable operation of the printhead. The reference voltage module provides a stable voltage reference for the logic and analog parts of the printhead, stabilizing the working environment of the printhead circuit and avoiding the impact of noise and unstable voltage on the printhead. In addition, the circuit also integrates resistors, voltage stabilizing tubes, and comparators, etc. for monitoring and comparing the voltage levels of each power supply and signal channel to ensure that they are within the safe and expected range. This design not only improves the reliability and service life of the printhead, but also guarantees the printing quality and efficiency, reduces the high replacement cost and downtime caused by printhead damage, and enables the printer to continue working even if a small number of nozzles in the printhead fail, thereby improving the utilization rate of the printhead and the overall printing effect.

Claims

1. A printer nozzle detection circuit, characterized in that: It includes a printhead high-voltage power supply module, a printhead logic voltage power supply module, a printhead waveform channel module and a reference voltage module; The nozzle high-voltage power supply module includes VPP_IN, which is used to provide high-voltage power to the nozzle and drive the nozzle's spraying mechanism; The printhead logic voltage power supply module includes 3V3_HEAD, which provides 3.3V voltage to the logic circuit in the printhead for controlling the electrospray operation of the printhead, and contains a microcontroller or driver chip; The nozzle waveform channel module includes COMA_HEAD1 and COMB_HEAD1. COMA_HEAD1 is used for the waveform output channel of the nozzle drive signal. COMB_HEAD1 is responsible for another set of nozzle waveform output signals, which are used to control the operation of multiple nozzles. Different voltage and time control signals are generated according to the nozzle waveforms output by COMA_HEAD1 and COMB_HEAD1 to drive the nozzle to spray ink; The reference voltage module includes VBS1, which is the reference voltage of the printhead and provides a voltage reference for the logic and analog parts of the printhead; Used to stabilize the working environment of the printhead circuit.

2. A printer head detection circuit according to claim 1, characterized in that: Furthermore, the VPP_IN is connected to one end of the resistor R492 through the resistor R493, the other end of the resistor R492 is also connected to the ground, one end of the resistor R492 is also connected to the ground through the voltage regulator D124, the voltage regulator D124 is also connected to the third pin of the comparator U1A, the second pin of the comparator U1A is connected to the ground through the resistor R489, the second pin of the comparator U1A is also connected to 3V3_F through the resistor R488, the fourth pin of the comparator U1A is connected to the ground, the eighth pin of the comparator U1A is connected to the ground through the capacitor C2, the capacitor C2 is also connected to 3V3_F, the first pin of the comparator U1A is connected to 3V3_F through the resistor R491, and the resistor R491 is also connected to CHECK_VPP through the resistor R490.

3. The printer head detection circuit according to claim 1, wherein: The 3V3_HEAD is connected to one end of the resistor R526 through the resistor R527, and the other end of the resistor R526 is also connected to the ground. One end of the resistor R526 is also connected to the ground through the voltage regulator D170, and the voltage regulator D170 is also connected to the fifth pin of the comparator U56B. The sixth pin of the comparator U56B is connected to the ground through the resistor R517. The sixth pin of the comparator U56B is also connected to 3V3_F through the resistor R518. The seventh pin of the comparator U56B is connected to 3V3_F through the resistor R525. The resistor R525 is also connected to CHECK_3V3_HEAD through the resistor R528.

4. A printer head detection circuit according to claim 1, characterized in that: The COMA_HEAD1 is connected to one end of the resistor R286 through the resistor R299, and the other end of the resistor R286 is also connected to the ground. One end of the resistor R286 is also connected to the ground through the voltage regulator D117, and the voltage regulator D117 is also connected to the ninth pin of the comparator U41C. The fourteenth pin of the comparator U41C is connected to 3V3_F through the resistor R309, and the resistor R309 is also connected to CHECK_COMA_HEAD1 through the resistor R298.

5. The printer head detection circuit according to claim 1, characterized in that: The COMB_HEAD1 is connected to one end of the resistor R292 through the resistor R312, and the other end of the resistor R292 is also connected to the ground. One end of the resistor R292 is also connected to the ground through the voltage regulator D115, and the voltage regulator D115 is also connected to the eleventh pin of the comparator U41D. The thirteenth pin of the comparator U41D is connected to 3V3_F through the resistor R307, and the resistor R307 is also connected to CHECK_COMB_HEAD1 through the resistor R295.

6. A printer head detection circuit according to claim 1, characterized in that: The VBS1 is connected to one end of the resistor R480 through the resistor R479, and the other end of the resistor R480 is also connected to the ground. One end of the resistor R480 is also connected to the ground through the voltage regulator D5. The voltage regulator D5 is also connected to the fifth pin of the comparator U57B. The second pin of the comparator U57B is connected to 3V3_F through the resistor R483, and the resistor R483 is also connected to DET_VBS through the resistor R484.

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