CN-121973553-A - Voltage control circuit of electrofluidic sprinkler and method thereof

CN121973553ACN 121973553 ACN121973553 ACN 121973553ACN-121973553-A

Abstract

The application discloses a voltage control circuit of an electrofluidic nozzle and a method thereof, relating to the field of electrofluidic ink-jet printing, wherein the method comprises the following steps: acquiring a voltage group corresponding to ink drops to be printed, generating jet voltage in the voltage group through a jet hole jet voltage generating unit, and generating critical voltage in the voltage group through a jet hole critical voltage generating unit; the method comprises the steps of obtaining driving signal parameters corresponding to printing parameters, generating an injection driving signal through an injection hole injection voltage control unit to turn on or off a first MOS tube group, generating a critical driving signal through an injection hole critical voltage control unit to turn on or off a second MOS tube group, and controlling on-off matching of the first MOS tube group and the second MOS tube group according to the voltage group and the driving signal parameters so as to enable the electric fluid ink-jet printer to execute printing operation. By configuring two groups of MOS tubes, a plurality of different ink drops are adapted, and an adapted jet voltage and a critical voltage are provided for an ink-jet printer so as to complete electrofluidic printing operation.

Inventors

GONG XINGQUAN
CAO WANSHENG
TANG WEI

Assignees

武汉国创科光电装备有限公司

Dates

Publication Date: 20260505
Application Date: 20260211

Claims (10)

1. A voltage control circuit of an electrofluidic nozzle is characterized in that the control circuit is applied to an electrofluidic ink jet printer and comprises a control chip, a nozzle spray voltage generating unit, a nozzle spray voltage controlling unit, a first MOS pipe group and a second MOS pipe group, wherein, The source electrode of the first MOS tube group is connected with the jet hole jet voltage generating unit, and the grid electrode of the first MOS tube group is connected with the jet hole jet voltage control unit; The source electrode of the second MOS tube group is connected with the spray hole critical voltage generating unit, and the grid electrode of the second MOS tube group is connected with the spray hole critical voltage control unit; The drain electrode of the first MOS tube group is connected with the drain electrode of the second MOS tube group, and the drain electrode of the first MOS tube group and the drain electrode of the second MOS tube group are connected with a load; the control chip controls the jet hole jet voltage control unit and the jet hole critical voltage control unit through control signals, so that the first MOS tube group and the second MOS tube group execute on-off actions, and further the load controls the jet action and the critical action of the electric fluid jet standby nozzle.
2. The control circuit of claim 1, wherein the orifice injection voltage generation unit and the orifice threshold voltage generation unit each comprise a base voltage generation subunit and a voltage amplification subunit, wherein, The base voltage generation subunit is used for generating the base voltage required by the voltage amplification subunit according to the control signal of the control chip; the voltage amplifying subunit is used for generating the spraying voltage and the critical voltage required by the load according to the basic voltage.
3. The control circuit according to claim 1 or 2, wherein the control chip obtains a voltage group corresponding to an ink droplet to be printed from a first association according to the characteristic of the ink droplet to be printed in the current electrofluidic printing, the characteristic of the ink droplet comprises the viscosity of the ink droplet, the voltage group comprises the ejection voltage and the critical voltage of the ink droplet, the first association comprises the association between a plurality of characteristics of the ink droplet and a plurality of voltage groups, one characteristic of the ink droplet corresponds to one voltage group, one voltage group corresponds to the number of MOS tubes in one MOS tube group, and the MOS tube groups are a first MOS tube group and a second MOS tube group; The control chip controls the jet hole jet voltage generating unit to generate jet voltage corresponding to the ink drop to be printed, and controls the jet hole critical voltage generating unit to generate critical voltage corresponding to the ink drop to be printed.
4. The control circuit according to claim 1 or 2, wherein the control chip obtains driving signal parameters corresponding to the printing parameters from a second association according to the printing parameters of the current electric fluid printing, the driving signal parameters comprise high level time, frequency and low level time of the driving signals, the printing parameters comprise printing frequency, single injection time and single silence time; The jet hole jet voltage control unit and the jet hole critical voltage control unit control the first MOS tube group and the second MOS tube group to execute on-off action through the drive signal parameters.
5. The control circuit of claim 1, wherein the first MOS tube group comprises a first MOS tube and a second MOS tube, the orifice injection voltage control unit comprises a first branch and a second branch, the first MOS tube corresponds to the first branch of the orifice injection voltage control unit, the second MOS tube corresponds to the second branch of the orifice injection voltage control unit, wherein, The control chip controls the on-off of the first MOS tube and the second MOS tube with a first time sequence, and the first time sequence is determined by the time difference of on or off between the first MOS tube and the second MOS tube.
6. The control circuit of claim 1 or 5, wherein the second MOS tube group comprises a third MOS tube and a fourth MOS tube, the orifice threshold voltage control unit comprises a third branch and a fourth branch, the third MOS tube corresponds to the third branch of the orifice threshold voltage control unit, the fourth MOS tube corresponds to the fourth branch of the orifice threshold voltage control unit, wherein, The control chip controls the on-off of the third MOS tube and the fourth MOS tube with a second time sequence, and the second time sequence is determined by the time difference of on or off between the third MOS tube and the fourth MOS tube.
7. The control circuit of claim 1, wherein the orifice injection voltage control unit comprises a first high level time and a first low level time, the orifice threshold voltage control unit comprises a second high level time and a second low level time, wherein, When the injection voltage is at the first high level time, the critical voltage is at the second low level time, and the first high level time is less than the second low level time; When the injection voltage is at the first low level time, the critical voltage is at the second high level time, and the second high level time is less than the first low level time.
8. The control circuit according to claim 1 or 7, wherein, The control chip controls the first MOS tube group to be conducted and the second MOS tube group to be turned off at a third time sequence, wherein the third time sequence is determined by the time difference between the turn-off of the second MOS tube group and the turn-on of the first MOS tube group, so that the second MOS tube group is in a turn-off state when the first MOS tube group is turned on; the control chip controls the first MOS tube group to be turned off and the second MOS tube group to be turned on according to a fourth time sequence, and the fourth time sequence is determined by the time difference between the turn-off of the first MOS tube group and the turn-on of the second MOS tube group, so that when the second MOS tube group is turned on, the first MOS tube group is in a turn-off state.
9. A method of controlling the voltage of an electrofluidic nozzle, applied to a voltage control circuit of an electrofluidic nozzle as claimed in any one of claims 1 to 8, said method comprising: Acquiring a voltage group corresponding to ink drops to be printed, generating jet voltage in the voltage group through a jet hole jet voltage generating unit, and generating critical voltage in the voltage group through a jet hole critical voltage generating unit; Acquiring driving signal parameters corresponding to printing parameters, generating an injection driving signal by an injection hole injection voltage control unit to turn on or off a first MOS tube group, and generating a critical driving signal by an injection hole critical voltage control unit to turn on or off a second MOS tube group, wherein the printing parameters comprise printing frequency, single injection time and single silence time, and the driving signal parameters comprise frequency, high level time and low level time; and controlling the on-off matching of the first MOS tube group and the second MOS tube group according to the voltage group and the driving signal parameter so as to enable the electric fluid ink-jet printer to execute printing operation.
10. The control method according to claim 9, wherein the number of MOS transistors in the first MOS transistor group is determined by a jet voltage and the number of MOS transistors in the second MOS transistor group is determined by a threshold voltage, wherein the control method further comprises: Determining the number of MOS tubes in the first MOS tube group according to the injection voltage; and determining the number of MOS tubes in the second MOS tube group according to the critical voltage.

Description

Voltage control circuit of electrofluidic sprinkler and method thereof Technical Field The application relates to the technical field of electrofluidic inkjet printers, in particular to a voltage control circuit of an electrofluidic nozzle and a method thereof. Background At present, the ink jet printing technology is widely applied to the field of intelligent products based on printed electronics, such as film sensors, flexible displays and intelligent labels, as a non-contact additive manufacturing process without a template. Electrofluidic printing forms a pattern by drawing ink droplets from a meniscus to a substrate by means of an electric field force, has a wide viscosity range, has the advantage of smaller droplet diameter than a general nozzle for jet printing, and is being studied extensively. Furthermore, electrohydrodynamic printing involves the ejection voltage and the threshold voltage of the ink drops. The ejection voltage is a voltage value that drags ink droplets from the meniscus of the taylor cone of ink droplets onto the substrate to perform a printing operation, and the threshold voltage is a voltage value that forms ink droplets into the meniscus of the taylor cone in a standby state or a silent state before the printing operation. The threshold voltage is generally not 0, which can improve the efficiency of the printing operation. Both the ejection voltage and the threshold voltage are related to the drop characteristics. It can be seen how to configure the ejection voltage and the threshold voltage for different ink droplet characteristics, so that the electrofluidic inkjet printer can perform electrofluidic printing operation, which is a problem to be solved. Disclosure of Invention The application provides a voltage control circuit of an electrofluidic nozzle and a method thereof, wherein two groups of MOS (metal oxide semiconductor) tubes are configured, the number of each group of MOS tubes is flexibly selected, and the voltage control circuit can adapt to a plurality of different ink drops, provide adaptive jet voltage and threshold voltage for an ink-jet printer, and further complete electrofluidic printing operation. The first aspect of the application discloses a voltage control circuit of an electrofluidic spray head, which is applied to an electrofluidic ink-jet printer and comprises a control chip, a spray orifice spray voltage generation unit, a spray orifice critical voltage generation unit, a spray orifice spray voltage control unit, a spray orifice critical voltage control unit, a first MOS pipe group and a second MOS pipe group, wherein a source electrode of the first MOS pipe group is connected with the spray orifice spray voltage generation unit, a grid electrode of the first MOS pipe group is connected with the spray orifice spray voltage control unit, the spray orifice spray voltage generation unit is used for generating spray orifice spray voltage, the spray orifice spray voltage control unit is used for controlling the on-off of the first MOS pipe group, a source electrode of the second MOS pipe group is connected with the spray orifice critical voltage generation unit, a grid electrode of the second MOS pipe group is connected with the spray orifice critical voltage control unit, the spray orifice critical voltage control unit is used for generating spray orifice critical voltage, a drain electrode of the first MOS pipe group is connected with a drain electrode of the second MOS pipe group, the drain electrode of the first MOS pipe group is connected with the drain electrode of the second MOS pipe group, and the first MOS pipe group is connected with a load, and the first MOS pipe group and the second MOS pipe group are connected with the spray nozzle critical voltage control unit and the first MOS pipe group are used for controlling the on-off operation of the first nozzle pipe group and the nozzle. In the scheme, two groups of MOS tubes are configured, the number of each group of MOS tubes is flexibly selected, a plurality of different ink drops (the characteristics of the ink drops are different, the jet voltage and the critical voltage of the ink drops are different, the pressure-bearing requirements on the MOS tubes are different, the pressure-bearing requirement of a single MOS tube has a limit value, and the characteristics of a plurality of different ink drops can not be met), and the adaptive jet voltage and the critical voltage are provided for an ink-jet printer so as to finish the electrofluidic printing operation. The jet orifice jet voltage generating unit and the jet orifice critical voltage generating unit can generate jet voltage and critical voltage according to the characteristics of ink drops, and the jet orifice jet voltage control unit and the jet orifice critical voltage control unit are matched with each other to generate PMW signals according to the current printing requirements, so that the on-off of the two groups of MOS tubes is adjus