CN102377161B - Piezoelectric nozzle protection circuit - Google Patents
Piezoelectric nozzle protection circuit Download PDFInfo
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- CN102377161B CN102377161B CN201010256918.4A CN201010256918A CN102377161B CN 102377161 B CN102377161 B CN 102377161B CN 201010256918 A CN201010256918 A CN 201010256918A CN 102377161 B CN102377161 B CN 102377161B
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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 piezoelectric nozzle protection circuit, relate to specifically a kind of too high or too low piezoelectric nozzle protection circuit that shower nozzle is caused to damage that prevents from inputting.
Background technology
Piezoelectric ink jet is printed and is referred to by applying voltage to piezo-electric crystal, makes it to occur at a high speed and slight distortion, and the ink in black chamber is extruded from nozzle, realizes the printing of image or word.Do the used time when piezo-electric crystal is subject to extraneous pulse voltage, piezo-electric crystal produces the volume reducing that distortion causes nozzle ink cavity.Like this, an oil dripping China ink just penetrates from nozzle.Then, piezo-electric crystal restores to the original state, and due to surface tension effects, new ink enters nozzle.By the large flow nozzle that is arranged side by side, just can obtain desirable spray printing width and resolution.Piezoelectric type shower nozzle requires strict powering on and power down order, and the order powering on is: logic circuit-high-voltage pulse, the order of power down: high-voltage pulse-logic circuit.Nozzle control panel is often installed by layman in factory, there will be that electric power polarity connects instead, high pressure and the problem such as low pressure is put upside down, overtension, and supply voltage shakiness easily causes the impact to shower nozzle, serious damage shower nozzle.So need to do perfect protection on nozzle control panel.
Summary of the invention
The problem existing for prior art, the object of the present invention is to provide a kind of too high or too low piezoelectric nozzle protection circuit that shower nozzle is caused to damage that prevents from inputting.
For achieving the above object, the present invention proposes a kind of piezoelectric nozzle protection circuit, described piezoelectric nozzle protection circuit is arranged between nozzle control panel power supply and voltage control circuit, described holding circuit comprises comparator, flip and flop generator and metal-oxide-semiconductor, in the time that upper piezoelectric voltage is not in the normal range (NR) at nozzle control panel, comparator in described holding circuit is output as low level, described flip and flop generator allows to be triggered, described metal-oxide-semiconductor is locked in off state, thereby effectively avoid circuit concussion, prevent the reverse polarity connection of power supply in installation process, transient peak, supply voltage is too high too low, the problems such as PCB excess Temperature cause shower nozzle to damage, nozzle control panel is burnt.
Further, described holding circuit comprises overvoltage crowbar and under-voltage protecting circuit.
Further, described overvoltage crowbar is mainly by comparator IC103A, two resistance, flip and flop generator, two triode T104, T105 and metal-oxide-semiconductor composition; Described under-voltage protecting circuit is mainly by comparator IC103B, two resistance, flip and flop generator, two triode T104, T105 and metal-oxide-semiconductor composition; Described overvoltage crowbar and under-voltage protecting circuit share above-mentioned flip and flop generator, 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 respectively input voltage and output voltage, output 1,7 is connected with the base stage of triode T105 after being connected in series a resistance, the emitter stage of triode T105 connects 12V power supply, the colelctor electrode of triode T105 is connected with 6 pin of described flip and flop generator, and passes through resistance eutral grounding; 2 pin of described flip and flop generator are connected with the base stage of triode T104, the grounded emitter of triode T104, and colelctor electrode is connected with the grid of described metal-oxide-semiconductor, and the source electrode of metal-oxide-semiconductor connects power supply.
Further, the base stage of described triode T105 is also 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, described metal-oxide-semiconductor is P-MOS pipe.
Piezoelectric nozzle protection circuit of the present invention is in the time that upper piezoelectric voltage is not in the normal range (NR) at nozzle control panel; comparator IC103A, IC103B in holding circuit are output as low level; flip and flop generator IC104 allows to be triggered; metal-oxide-semiconductor T103 is locked in off state; thereby effectively avoid circuit concussion; prevent that the problems such as too high too low, the PCB excess Temperature of reverse polarity connection, transient peak, the supply voltage of power supply in installation process from causing shower nozzle to damage, nozzle control panel is burnt.
Brief description of the drawings
Fig. 1 is the structured flowchart of the nozzle control panel of a specific embodiment of the present invention;
Fig. 2 is the piezoelectric nozzle protection circuit schematic diagram of a specific embodiment of the present invention.
Detailed description of the invention
As shown in Figure 1, the nozzle control panel of a specific embodiment of the present invention is connected with shower nozzle with ink-jet printer mainboard, the print data of shower nozzle is directed to mainboard, nozzle control panel comprises single-chip microcomputer, FPGA/CPLD, voltage control circuit and LVDS coffret, and FPGA/CPLD is for generation of the control signal of shower nozzle, as firing pulse, clock signal, pixel data, heating-up temperature etc., and send corresponding control command 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 nozzle control panel, controls shower nozzle work; Nearly all parameter on nozzle control panel, as nozzle temperature, sensor signal (paper is wide, paper is thick, liquid level etc. in assistant print cartridges), clock signal can be passed through microcontroller serial port remote adjustment.Voltage control circuit is used for according to the control command of single-chip microcomputer, the driving voltage needing by the each shower nozzle of its booster circuit control.
Fig. 2 is the schematic diagram of piezoelectric nozzle protection circuit in one embodiment of the invention; dual comparator IC103A, the IC103B that holding circuit is exported taking open collector and flip and flop generator IC104 are core formation; P-MOS pipe T103 is as power switch; holding 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 composition.Under-voltage protecting circuit is by resistance R 129, R130, comparator IC103B, flip and flop generator IC104, triode T104, T105 and metal-oxide-semiconductor T103 composition.
Comparator IC103A, the anode 3 of IC103B, negative terminal 6 meets reference voltage 5V, negative terminal 2, anode 5 connects respectively input voltage and output voltage, output 1, 7 are connected with the base stage 1 of triode T105 after being connected in series a resistance R 120, the emitter stage 3 of triode T105 connects 12V power supply, colelctor electrode 2 is connected with 6 pin of flip and flop generator IC104, and by resistance R 123 ground connection, 2 pin of flip and flop generator IC104 are connected with the base stage 1 of triode T104, emitter stage 3 ground connection of triode T104, colelctor electrode 2 is connected with the grid 1 of metal-oxide-semiconductor T103, the source electrode 3 of metal-oxide-semiconductor T103 connects power supply.The base stage 1 of triode T105 is also 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.
When start, software control end is to 35VON end input one high level, triode T106 is in saturation state, colelctor electrode 2 and emitter stage 3 conductings of triode T106, colelctor electrode 2 ground connection of triode T106, give the 2 pin input low levels of flip and flop generator IC104, its 3 pin output high level, now triode T104 is in saturation state, colelctor electrode 2 and emitter stage 3 conductings of triode T104, triode T104 colelctor electrode 2 ground connection, connect+35V of source electrode 3 power supply of metal-oxide-semiconductor T103, grid 1 is connected on resistance R 126, between R127, another termination+35V power supply of resistance R 126, the other end ground connection of resistance R 127, after triode T104 conducting, power supply is voltage drop after resistance R 126, 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 nozzle control panel, 35V power supply is directly powered to nozzle control panel, the work of nozzle control panel control shower nozzle is normally printed.
The negative input end 2 of input voltage input comparator IC103A after R113, R114 dividing potential drop in overvoltage crowbar, 5V reference voltage is inputted from the other end 3, the output 1 of comparator IC103A is connected with the base stage 1 of triode T105, the emitter stage 3 of triode T105 connects 12V voltage, colelctor electrode 2 is connected with trigger 6 ends of flip and flop generator IC104, and by resistance R 123 ground connection; When input voltage is during higher than over-voltage protection point, negative terminal 2 input voltages of comparator IC103A are greater than anode 3 input voltages, output 1 output low level, now, emitter stage 3 and colelctor electrode 2 conductings of triode T105, the 6 pin ground connection of colelctor electrode 2 and flip and flop generator IC104, for low level, flip and flop generator IC104 is triggered, its 3 pin output low level, triode T104 cut-off, metal-oxide-semiconductor T103 cut-off;
In like manner, output voltage is through R129, R130 separates input voltage the positive input terminal 5 of a part of input comparator IC103B, 5V reference voltage is inputted from the other end, the output of comparator IC103B is connected with the base stage of triode T105, the emitter stage 3 of triode T105 connects 12V voltage, the trigger 6 pin ground connection of colelctor electrode 2 and flip and flop generator IC104, for low level, when input voltage is during lower than over-voltage protection point, anode 5 input voltages of comparator IC103B are less than negative terminal 6 input voltages, output 7 output low levels, now, emitter stage 3 and colelctor electrode 2 conductings of triode T105, the 6 pin ground connection of colelctor electrode 2 and flip and flop generator IC104, for low level, flip and flop generator IC104 is triggered, its 3 pin output low level, triode T104 cut-off, metal-oxide-semiconductor T103 cut-off.
The present invention by arranging holding circuit on nozzle control panel; in the time that upper piezoelectric voltage is not in the normal range (NR) at nozzle control panel; comparator IC103A, IC103B in holding circuit are output as low level; flip and flop generator IC104 allows to be triggered; metal-oxide-semiconductor T103 is locked in off state; thereby effectively avoid circuit concussion; prevent that the problems such as too high too low, the PCB excess Temperature of reverse polarity connection, transient peak, the supply voltage of power supply in installation process from causing shower nozzle to damage, nozzle control panel is burnt.
It is to be noted and any distortion of making according to the specific embodiment of the present invention all do not depart from the scope that spirit of the present invention and claim are recorded.
Claims (1)
1. a piezoelectric nozzle protection circuit, described piezoelectric nozzle protection circuit is arranged between nozzle control panel power supply and voltage control circuit, described holding circuit comprises two comparators, a flip and flop generator and a metal-oxide-semiconductor, described metal-oxide-semiconductor is as power switch, wherein a comparator is for overvoltage protection, and another comparator is for under-voltage protection, in the time that upper piezoelectric voltage is not in the normal range (NR) at nozzle control panel, comparator in described holding circuit is output as low level, described flip and flop generator allows to be triggered, described metal-oxide-semiconductor is locked in off state, thereby effectively avoid circuit concussion, prevent the reverse polarity connection of power supply in installation process, transient peak, supply voltage is too high too low, the problems such as PCB excess Temperature cause shower nozzle to damage, nozzle control panel is burnt, it is characterized in that, described holding circuit comprises overvoltage crowbar and under-voltage protecting circuit, described overvoltage crowbar is mainly by comparator IC103A, two resistance R 113 and R114, flip and flop generator, two triode T104, T105 and metal-oxide-semiconductor composition, described under-voltage protecting circuit is mainly by comparator IC103B, two resistance R 129 and R130, flip and flop generator, two triode T104, T105 and metal-oxide-semiconductor composition, described overvoltage crowbar and under-voltage protecting circuit share above-mentioned flip and flop generator, two triodes and metal-oxide-semiconductor, the anode 3 of comparator IC103A and the negative terminal 6 of IC103B meet reference voltage 5V, the negative terminal 2 of comparator IC103A and the anode 5 of comparator IC103B connect respectively input voltage and output voltage, the output 1,7 of comparator IC103A and comparator IC103B is connected with the base stage of triode T105 after being connected in series a resistance R 120, the emitter stage of triode T105 connects 12V power supply, the colelctor electrode of triode T105 is connected with 6 pin of described flip and flop generator, and by resistance R 123 ground connection, 3 pin of described flip and flop generator are connected with the base stage of triode T104, the grounded emitter of triode T104, and colelctor electrode is connected with the grid of described metal-oxide-semiconductor, and the source electrode of metal-oxide-semiconductor connects power supply, and the model of described flip and flop generator is LM555.
2. piezoelectric nozzle protection circuit as claimed in claim 1, is characterized in that: the base stage of described triode T105 is also connected in series a pull-up resistor, another termination 12V voltage of described pull-up resistor, and the base stage of triode T105 is drawn high by described pull-up resistor.
3. piezoelectric nozzle protection circuit as claimed in claim 1, is characterized in that: described metal-oxide-semiconductor is 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 |
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| CN201010256918.4A CN102377161B (en) | 2010-08-18 | 2010-08-18 | Piezoelectric nozzle protection circuit |
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| CN102377161A CN102377161A (en) | 2012-03-14 |
| CN102377161B true CN102377161B (en) | 2014-10-29 |
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| CN201010256918.4A Active CN102377161B (en) | 2010-08-18 | 2010-08-18 | Piezoelectric nozzle protection circuit |
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Families Citing this family (4)
| 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 |
| 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 |
| 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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6481814B2 (en) * | 2001-02-28 | 2002-11-19 | Lemark International, Inc. | Apparatus and method for ink jet printhead voltage fault protection |
| JP2010052185A (en) * | 2008-08-26 | 2010-03-11 | Ricoh Co Ltd | Overvoltage protection apparatus |
| JP5615490B2 (en) * | 2008-09-26 | 2014-10-29 | 株式会社ミマキエンジニアリング | Printing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Title |
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| JP特开2010-52185A 2010.03.11 |
| JP特开2010-76264A 2010.04.08 |
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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. |