CN102377161A - Piezoelectric nozzle protection circuit - Google Patents
Piezoelectric nozzle protection circuit Download PDFInfo
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- CN102377161A CN102377161A CN2010102569184A CN201010256918A CN102377161A CN 102377161 A CN102377161 A CN 102377161A CN 2010102569184 A CN2010102569184 A CN 2010102569184A CN 201010256918 A CN201010256918 A CN 201010256918A CN 102377161 A CN102377161 A CN 102377161A
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Abstract
The invention discloses a piezoelectric nozzle protection circuit, which consists of double comparators IC103A and IC103B and a bistable flip-flop IC104, wherein the collectors of the double comparators IC103A and IC103B have open-circuit output; the comparators IC103A and IC103B and the bistable flip-flop IC104 form a core; a metal oxide semiconductor (MOS) transistor T103 serves as a power switch; and the comparator IC103A is used for over-voltage protection, and the other comparator IC103B is used for under-voltage protection. The protection circuit provided by the invention is arranged on a nozzle control board; when power-on voltage is not within the normal range of the nozzle control board, the output of the comparators IC103A and IC103B in the protection circuit is a low level, the bistable flip-flop IC104 is permitted to be triggered, and the MOS transistor T103 is locked in an off state, thereby effectively avoiding the oscillation of the circuit and preventing the problems of opposite polarity and over-high/over-low transient peaks and power supply voltage of a power supply, over-high printed circuit board (PCB) temperature and the like in a mounting process from damaging a nozzle and burning the nozzle control board out.
Description
Technical field
The present invention relates to a kind of piezo jets protective circuit, relate to a kind of too high or too low piezo jets protective circuit that shower nozzle is caused damage that prevents to import specifically.
Background technology
Piezoelectric ink jet is printed and is meant through applying voltage to piezoelectric crystal, makes it to take place at a high speed and slight distortion, and the printing ink in the black chamber is extruded from nozzle, realizes the printing of image or literal.Do the time spent when piezoelectric crystal receives extraneous pulse voltage, piezoelectric crystal produces the volume reducing that distortion causes the nozzle ink cavity.Like this, an oil dripping China ink just penetrates from nozzle.Then, piezoelectric crystal restores to the original state, because surface tension effects, new printing ink gets into nozzle.Through the big flow nozzle that is arranged side by side, just can obtain desirable spray printing width and resolution.What the piezoelectric type shower nozzle was strict powers on and the power down order, and the order that powers on is: logical circuit-high-voltage pulse, the order of power down: high-voltage pulse-logical circuit.The shower nozzle control board is often installed by the layman in factory, can occur that electric power polarity connects instead, high pressure and problems such as low pressure is put upside down, overtension, and the supply power voltage shakiness causes the impact to shower nozzle easily, serious damage shower nozzle.So need on the shower nozzle control board, do perfect protection.
Summary of the invention
Problem to prior art exists the object of the present invention is to provide a kind of too high or too low piezo jets protective circuit that shower nozzle is caused damage that prevents to import.
For realizing above-mentioned purpose; The present invention proposes a kind of piezo jets protective circuit, and said piezo jets protective circuit is arranged between shower nozzle control board power supply and the voltage control circuit, and said protective circuit comprises comparator; Flip and flop generator and metal-oxide-semiconductor; When last piezoelectric voltage was not in the normal range (NR) of shower nozzle control board, the comparator in the said protective circuit was output as low level, and said flip and flop generator allows to be triggered; Said metal-oxide-semiconductor is locked in off state; Thereby avoid circuit concussion effectively, prevent that the polarity of power supply connects instead in the installation process, transient peak, supply power voltage cross and exceed low, PCB temperature and cross problem such as height and cause the shower nozzle damage, the shower nozzle control board is burnt.
Further, said protective circuit comprises overvoltage crowbar and under-voltage protecting circuit.
Further, said overvoltage crowbar is mainly by comparator IC103A, two resistance, and flip and flop generator, two triode T104, T105 and metal-oxide-semiconductors are formed; Said under-voltage protecting circuit is mainly by comparator IC103B, two resistance, and flip and flop generator, two triode T104, T105 and metal-oxide-semiconductors are formed; The shared above-mentioned flip and flop generator of said overvoltage crowbar and under-voltage protecting circuit, two triodes and metal-oxide-semiconductor; Anode 3, the negative terminal 6 of comparator IC103A, IC103B meet reference voltage 5V; Negative terminal 2, anode 5 connect input voltage and output voltage respectively; Output 1,7 is connected with the base stage of triode T105 after being connected in series a resistance; The emitter of triode T105 connects the 12V power supply, and the collector electrode of triode T105 is connected with 6 pin of said flip and flop generator, and passes through grounding through resistance; 2 pin of said flip and flop generator are connected with the base stage of triode T104, the grounded emitter of triode T104, and collector electrode is connected with the grid of said metal-oxide-semiconductor, and the source electrode of metal-oxide-semiconductor connects power supply.
Further, the base stage of said triode T105 also is connected in series a pull-up resistor, another termination 12V voltage of pull-up resistor, and the base stage of triode T105 is drawn high by pull-up resistor.
Further, said metal-oxide-semiconductor is the P-MOS pipe.
Piezo jets protective circuit of the present invention is when last piezoelectric voltage is not in the normal range (NR) of shower nozzle control board; Comparator IC103A in the protective circuit, IC103B are output as low level; Flip and flop generator IC104 allows to be triggered, and metal-oxide-semiconductor T103 is locked in off state, thereby avoids the circuit concussion effectively; Prevent that the polarity of power supply connects instead in the installation process, transient peak, supply power voltage cross and exceed low, PCB temperature and cross problem such as height and cause shower nozzle to damage, the shower nozzle control board is burnt.
Description of drawings
Fig. 1 is the structured flowchart of the shower nozzle control board of a specific embodiment of the present invention;
Fig. 2 is the piezo jets protective circuit schematic diagram of a specific embodiment of the present invention.
Embodiment
As shown in Figure 1, the shower nozzle control board of a specific embodiment of the present invention links to each other with shower nozzle with the ink-jet printer mainboard, and the print data of shower nozzle is directed to mainboard; The shower nozzle control board comprises single-chip microcomputer, FPGA/CPLD, voltage control circuit and LVDS coffret, and FPGA/CPLD is used to produce the control signal of shower nozzle, like firing pulse; Clock signal; Pixel data, heating-up temperature etc., and send control commands corresponding by single-chip microcomputer to shower nozzle according to the control signal of shower nozzle; Single-chip microcomputer receives the shower nozzle control signal that FPGA/CPLD sends, and regulates the parameter of ink-jet printer mainboard and shower nozzle control board, the work of control shower nozzle; Nearly all parameter on the shower nozzle control board can be passed through the microcontroller serial port remote adjustment like nozzle temperature, sensor signal (paper is wide, paper is thick, liquid level etc. in the assistant print cartridges), clock signal.Voltage control circuit is used for the control command according to single-chip microcomputer, controls the driving voltage that each shower nozzle needs through its booster circuit.
Fig. 2 is the schematic diagram of piezo jets protective circuit in the one embodiment of the invention; Protective circuit is that core constitutes with dual comparator IC103A, IC103B and the flip and flop generator IC104 of open collector output, and P-MOS pipe T103 is as mains switch, and protective circuit comprises overvoltage crowbar and under-voltage protecting circuit; Overvoltage crowbar is by resistance R 113, R114; Comparator IC103A, flip and flop generator IC104, triode T104, T105 and metal-oxide-semiconductor T103 form.Under-voltage protecting circuit is by resistance R 129, R130, comparator IC103B, and flip and flop generator IC104, triode T104, T105 and metal-oxide-semiconductor T103 form.
Anode 3, the negative terminal 6 of comparator IC103A, IC103B meet reference voltage 5V; Negative terminal 2, anode 5 connect input voltage and output voltage respectively, and output 1,7 is connected with the base stage 1 of triode T105 through serial connection one resistance R 120 backs, and the emitter 3 of triode T105 connects the 12V power supply; Collector electrode 2 is connected with 6 pin of flip and flop generator IC104; And through resistance R 123 ground connection, 2 pin of flip and flop generator IC104 are connected with the base stage 1 of triode T104, emitter 3 ground connection of triode T104; Collector electrode 2 is connected with the grid 1 of metal-oxide-semiconductor T103, and the source electrode 3 of metal-oxide-semiconductor T103 connects power supply.The base stage 1 of triode T105 also is connected in series a pull-up resistor R119, another termination 12V voltage of pull-up resistor R119, and the base stage 1 of triode T105 is drawn high by pull-up resistor R119.
During start, software control end is to 35VON end input one high level, and triode T106 is in saturation condition; The collector electrode 2 of triode T106 and emitter 3 conductings, collector electrode 2 ground connection of triode T106 are promptly given the 2 pin input low levels of flip and flop generator IC104; Then its 3 pin is exported high level, and this moment, triode T104 was in saturation condition, collector electrode 2 and emitter 3 conductings of triode T104; Triode T104 collector electrode 2 ground connection, the source electrode 3 of metal-oxide-semiconductor T103 connects+the 35V power supply, and grid 1 is connected between resistance R 126, the R127; Another termination+35V power supply of resistance R 126, the other end ground connection of resistance R 127 is after the triode T104 conducting; Power supply voltage after resistance R 126 descends, and grid 1 voltage of metal-oxide-semiconductor T103 is less than source electrode 3 voltages, metal-oxide-semiconductor T103 conducting; When in the normal power supply voltage range of input voltage at the shower nozzle control board, the 35V power supply is directly to the power supply of shower nozzle control board, and normal printing is carried out in the work of shower nozzle control board control shower nozzle.
Input voltage negative input end 2 of input comparator IC103A after R113, the R114 dividing potential drop in overvoltage crowbar; The 5V reference voltage is from the other end 3 inputs; The output 1 of comparator IC103A is connected with the base stage 1 of triode T105; The emitter 3 of triode T105 connects 12V voltage, and collector electrode 2 is connected with trigger 6 ends of flip and flop generator IC104, and through resistance R 123 ground connection; When input voltage was higher than over-voltage protection point, negative terminal 2 input voltages of comparator IC103A were greater than anode 3 input voltages, output 1 output low level; At this moment, emitter 3 and collector electrode 2 conductings of triode T105, the 6 pin ground connection of collector electrode 2 and flip and flop generator IC104; Be low level, flip and flop generator IC104 is triggered, its 3 pin output low level; Triode T104 ends, and metal-oxide-semiconductor T103 ends;
In like manner, output voltage is told the positive input terminal 5 of a part of input comparator IC103B to input voltage through R129, R130, and the 5V reference voltage is imported from the other end; The output of comparator IC103B is connected with the base stage of triode T105, and the emitter 3 of triode T105 connects 12V voltage, the trigger 6 pin ground connection of collector electrode 2 and flip and flop generator IC104; Be low level, when input voltage was lower than over-voltage protection point, anode 5 input voltages of comparator IC103B were less than negative terminal 6 input voltages; Output 7 output low levels, at this moment, emitter 3 and collector electrode 2 conductings of triode T105; The 6 pin ground connection of collector electrode 2 and flip and flop generator IC104 are low level, and flip and flop generator IC104 is triggered; Its 3 pin output low level, triode T104 ends, and metal-oxide-semiconductor T103 ends.
The present invention is through being provided with protective circuit on the shower nozzle control board; When last piezoelectric voltage is not in the normal range (NR) of shower nozzle control board; Comparator IC103A in the protective circuit, IC103B are output as low level; Flip and flop generator IC104 allows to be triggered, and metal-oxide-semiconductor T103 is locked in off state, thereby avoids the circuit concussion effectively; Prevent that the polarity of power supply connects instead in the installation process, transient peak, supply power voltage cross and exceed low, PCB temperature and cross problem such as height and cause shower nozzle to damage, the shower nozzle control board is burnt.
It is to be noted and any distortion of making according to embodiment of the present invention all do not break away from the scope that spirit of the present invention and claim are put down in writing.
Claims (5)
1. piezo jets protective circuit; Said piezo jets protective circuit is arranged between shower nozzle control board power supply and the voltage control circuit, it is characterized in that, said protective circuit comprises two comparators; A flip and flop generator and a metal-oxide-semiconductor; Metal-oxide-semiconductor T103 is as mains switch, and wherein a comparator is used for overvoltage protection, and another comparator is used for under-voltage protection; When last piezoelectric voltage is not in the normal range (NR) of shower nozzle control board; Comparator in the said protective circuit is output as low level; Said flip and flop generator allows to be triggered, and said metal-oxide-semiconductor is locked in off state, thereby avoids the circuit concussion effectively; Prevent that the polarity of power supply connects instead in the installation process, transient peak, supply power voltage cross and exceed low, PCB temperature and cross problem such as height and cause shower nozzle to damage, the shower nozzle control board is burnt.
2. according to the protective circuit of piezo jets described in the claim 1, it is characterized in that said protective circuit comprises overvoltage crowbar and under-voltage protecting circuit.
3. according to the protective circuit of piezo jets described in the claim 2, it is characterized in that said overvoltage crowbar is mainly by comparator IC103A, two resistance, flip and flop generator, two triode T104, T105 and metal-oxide-semiconductors are formed; Said under-voltage protecting circuit is mainly by comparator IC103B, two resistance, and flip and flop generator, two triode T104, T105 and metal-oxide-semiconductors are formed; The shared above-mentioned flip and flop generator of said overvoltage crowbar and under-voltage protecting circuit, two triodes and metal-oxide-semiconductor; Anode 3, the negative terminal 6 of comparator IC103A, IC103B meet reference voltage 5V; Negative terminal 2, anode 5 connect input voltage and output voltage respectively; Output 1,7 is connected with the base stage of triode T105 after being connected in series a resistance; The emitter of triode T105 connects the 12V power supply, and the collector electrode of triode T105 is connected with 6 pin of said flip and flop generator, and passes through grounding through resistance; 2 pin of said flip and flop generator are connected with the base stage of triode T104, the grounded emitter of triode T104, and collector electrode is connected with the grid of said metal-oxide-semiconductor, and the source electrode of metal-oxide-semiconductor connects power supply.
4. piezo jets protective circuit according to claim 3 is characterized in that the base stage of said triode T105 also is connected in series a pull-up resistor, another termination 12V voltage of said pull-up resistor, and the base stage of triode T105 is drawn high by said pull-up resistor.
5. piezo jets protective circuit according to claim 1 is characterized in that, said metal-oxide-semiconductor is the P-MOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010256918.4A CN102377161B (en) | 2010-08-18 | 2010-08-18 | Piezoelectric nozzle protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010256918.4A CN102377161B (en) | 2010-08-18 | 2010-08-18 | Piezoelectric nozzle protection circuit |
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| CN102377161A true CN102377161A (en) | 2012-03-14 |
| CN102377161B CN102377161B (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010256918.4A Active CN102377161B (en) | 2010-08-18 | 2010-08-18 | Piezoelectric nozzle protection circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103448391A (en) * | 2013-09-30 | 2013-12-18 | 北京美科艺数码科技发展有限公司 | Inkjet printing device |
| CN103660640A (en) * | 2012-09-24 | 2014-03-26 | 长沙八思量信息技术有限公司 | High-speed inkjet printer control system adopting FPGA to realize bit operation |
| CN104085193A (en) * | 2014-07-08 | 2014-10-08 | 北京美科艺数码科技发展有限公司 | Spraying head protective circuit and spraying head control panel |
| CN104617549A (en) * | 2015-02-06 | 2015-05-13 | 青岛歌尔声学科技有限公司 | Overvoltage protecting circuit and electronic product |
Citations (4)
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| US20020118234A1 (en) * | 2001-02-28 | 2002-08-29 | Demoor Mark Kevin | Apparatus and method for ink jet printhead voltage fault protection |
| CN1463848A (en) * | 2002-06-17 | 2003-12-31 | 明基电通股份有限公司 | Ink-jet printer ink-ejecting unit open circuit and short circuit testing process and apparatus |
| JP2010052185A (en) * | 2008-08-26 | 2010-03-11 | Ricoh Co Ltd | Overvoltage protection apparatus |
| JP2010076264A (en) * | 2008-09-26 | 2010-04-08 | Mimaki Engineering Co Ltd | Printer and voltage control apparatus |
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2010
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020118234A1 (en) * | 2001-02-28 | 2002-08-29 | Demoor Mark Kevin | Apparatus and method for ink jet printhead voltage fault protection |
| CN1463848A (en) * | 2002-06-17 | 2003-12-31 | 明基电通股份有限公司 | Ink-jet printer ink-ejecting unit open circuit and short circuit testing process and apparatus |
| JP2010052185A (en) * | 2008-08-26 | 2010-03-11 | Ricoh Co Ltd | Overvoltage protection apparatus |
| JP2010076264A (en) * | 2008-09-26 | 2010-04-08 | Mimaki Engineering Co Ltd | Printer and voltage control apparatus |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103660640A (en) * | 2012-09-24 | 2014-03-26 | 长沙八思量信息技术有限公司 | High-speed inkjet printer control system adopting FPGA to realize bit operation |
| CN103448391A (en) * | 2013-09-30 | 2013-12-18 | 北京美科艺数码科技发展有限公司 | Inkjet printing device |
| CN103448391B (en) * | 2013-09-30 | 2016-03-30 | 北京美科艺数码科技发展有限公司 | A kind of inkjet-printing device |
| CN104085193A (en) * | 2014-07-08 | 2014-10-08 | 北京美科艺数码科技发展有限公司 | Spraying head protective circuit and spraying head control panel |
| CN104085193B (en) * | 2014-07-08 | 2016-07-06 | 北京美科艺数码科技发展有限公司 | Shower nozzle protection circuit and nozzle control panel |
| CN104617549A (en) * | 2015-02-06 | 2015-05-13 | 青岛歌尔声学科技有限公司 | Overvoltage protecting circuit and electronic product |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102377161B (en) | 2014-10-29 |
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Effective date of registration: 20200903 Address after: Room 101, Building 4, No. 5 Qianqian Road, Changping District Science and Technology Park, Beijing 102200 Patentee after: BEIJING KEJIACAI TECHNOLOGY Co.,Ltd. Address before: 100086 No. 82, Zhichun Road, Beijing, China. Institute of space technology, 512, South China, Haidian District Patentee before: Beijing Meikeyi Digital Technology Development Co.,Ltd. |
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