CN109782668A - Control circuit and short-circuit protection system for the power-on time of needle-type print head - Google Patents
Control circuit and short-circuit protection system for the power-on time of needle-type print head Download PDFInfo
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- CN109782668A CN109782668A CN201910077116.8A CN201910077116A CN109782668A CN 109782668 A CN109782668 A CN 109782668A CN 201910077116 A CN201910077116 A CN 201910077116A CN 109782668 A CN109782668 A CN 109782668A
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- 239000003990 capacitor Substances 0.000 claims description 10
- 241001422033 Thestylus Species 0.000 claims 7
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000002159 abnormal effect Effects 0.000 description 7
- 230000005611 electricity Effects 0.000 description 6
- 238000007639 printing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 210000001699 lower leg Anatomy 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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Abstract
本发明公开一种对针式打印头通电时间的控制电路及短路保护系统，包括防反接单元、延时单元、分压单元、比较单元、翻转单元及驱动单元，防反接单元的输入端用于连接打印机的驱动输出端，防反接单元的输出端与延时单元的输入端电连接，延时单元的输出端与比较单元的第二输入端电连接，分压单元的输入端用于连接外部VCC供电端，分压单元的输出端与比较单元的第一输入端电连接，比较单元的输出端与翻转单元电连接，翻转单元与驱动单元的输入端电连接。本发明通过检测并控制打印头线圈通电时间，如果打印头通电接近极限时间，将会强制自动断开打印头驱动电压，从而保护打印头线圈，避免其超过极限通电时间而损坏。
The invention discloses a control circuit and a short-circuit protection system for the power-on time of a needle-type print head. It is used to connect the drive output end of the printer, the output end of the anti-reverse connection unit is electrically connected to the input end of the delay unit, the output end of the delay unit is electrically connected to the second input end of the comparison unit, and the input end of the voltage dividing unit is used for For connecting the external VCC power supply terminal, the output terminal of the voltage dividing unit is electrically connected to the first input terminal of the comparison unit, the output terminal of the comparison unit is electrically connected to the inversion unit, and the inversion unit is electrically connected to the input terminal of the driving unit. The present invention detects and controls the power-on time of the print head coil. If the power-on time of the print head is close to the limit time, the drive voltage of the print head will be forcibly automatically disconnected, thereby protecting the print head coil and preventing it from being damaged beyond the limit power-on time.
Description
Technical field
The present invention relates to the control circuit fields of printer, more particularly to the control of a kind of pair of needle type print head conduction time
Circuit and short circuit protection system processed.
Background technique
Printer is one of output equipment of computer, for computer disposal result to be printed upon associated media.Weighing apparatus
The index of amount printer quality has three: print resolution, print speed and noise.There are many type of printer, by printing member
Whether part has stroke to paper, divides impact printer and non-impact printer.By printable character structure, holotype word is divided to beat
Print machine and dot character printer.In such a way that line inscribed is formed on paper, divide string data printer and line printer.By being adopted
Technology divides the printers such as cylindricality, spherical shape, ink jet type, heat-sensitive type, laser type, electrostatic, magnetic-type, LED type.
In stylus printer, print head is valuable component.However in stylus printer production test procedure, if master control borad
There is exception, will cause print head Inside coil and be powered and damage for a long time, to reduce the stability of print head, also reduce
The quality of the printer of production, reduces the service life of printer.
Summary of the invention
The purpose of the present invention is overcoming shortcoming in the prior art, a kind of pair of needle type print head conduction time is provided
Control circuit and short circuit protection system can be forced automatic to disconnect print head driving electricity when coil conduction time is close to the limit
Pressure also improves the printing of production to achieve the purpose that control print head conduction time to improve the stability of print head
The quality of machine also improves the service life of printer.
The purpose of the present invention is achieved through the following technical solutions:
A kind of control circuit of pair of needle type print head conduction time, comprising: anti-reverse unit, delay unit, partial pressure unit,
Comparing unit, roll-over unit and driving unit, the input terminal of the anti-reverse unit are used to connect the drive output of printer,
The output end of the anti-reverse unit is electrically connected with the input terminal of the delay unit, the output end of the delay unit with it is described
Second input terminal of comparing unit is electrically connected, and the input terminal of the partial pressure unit is for connecting external VCC feeder ear, the partial pressure
The output end of unit is electrically connected with the first input end of the comparing unit, and the output end of the comparing unit and the overturning are single
Member electrical connection, the roll-over unit are electrically connected with the input terminal of the driving unit.
The anti-reverse unit includes diode D1 in one of the embodiments, and the cathode of the diode D1 is used for
The drive output of printer is connected, the anode of the diode D1 is electrically connected with the input terminal of the delay unit.
The delay unit includes resistance R1, resistance R2 and capacitor C1 in one of the embodiments, the resistance R2's
First end is electrically connected with the output end of the anti-reverse unit, the first end electricity of the second end of the resistance R2 and the resistance R1
Connection, the second end of the resistance R1 are electrically connected with the second input terminal of the comparing unit.
The comparing unit includes first comparator U1A and diode D4, first ratio in one of the embodiments,
Crus secunda compared with device U1A is electrically connected with the output end of the delay unit, the first foot of the first comparator U1A with described point
The output end electrical connection of unit is pressed, the output end of the first comparator U1A is electrically connected with the anode of the diode D4, described
The cathode of diode D4 is electrically connected with the output end of the roll-over unit.
The partial pressure unit includes resistance R3 and resistance R4, the first end of the resistance R3 in one of the embodiments,
For connecting external VCC feeder ear, the second end of the resistance R3 is grounded after the resistance R4, the second end of the resistance R3
Also it is electrically connected with the third foot of the first comparator U1A.
The roll-over unit includes the second comparator, resistance R17 and resistance R18, the electricity in one of the embodiments,
For connecting external VCC feeder ear, the second end of the resistance R17 is grounded the first end of resistance R17 after the resistance R18, and
The second end of the resistance R17 is also electrically connected with the non-inverting input terminal of second comparator.
The driving unit includes triode Q1, relay K1 and diode D8 in one of the embodiments, and described three
The base stage of pole pipe Q1 is electrically connected with the output end of second comparator, the collector of the triode Q1 respectively with the relay
The electrical connection of the anode of the first end of device K1 and the diode D8, the emitter ground connection of the triode Q1, the diode D8
Cathode be electrically connected with the second end of the relay K1.
The driving unit further includes light emitting diode D2 in one of the embodiments, the light emitting diode D2's
Anode is electrically connected with the collector of the triode Q1, the minus earth of the light emitting diode D2.
Second comparator uses the comparator of model LM324 in one of the embodiments,.
A kind of short circuit protection system of pair of needle type print head conduction time, it is electric including the control described in any one of above
Road.
The present invention compared with the prior art the advantages of and have the beneficial effect that:
The present invention is the control circuit and short circuit protection system of a kind of pair of needle type print head conduction time, is delayed by setting
Unit, comparing unit and roll-over unit, when printer driver end occurs abnormal, then will not output voltage so that
It discharges in comparing unit delay unit, and the level of the output end of its own also gradually rises, so that overturning
Output low level is into driving unit after unit is overturn, so that driving unit disconnects, entire printer driver voltage
Also it is disconnected；In this way, by detecting and controlling print head coil conduction time, it, will if print head is powered close to limit time
It can force to disconnect print head driving voltage automatically, to protect print head coil, avoid it from overstepping the extreme limit conduction time and damage.
The stability of print head has can be improved in the application, also improves the quality of the printer of production, also improves making for printer
Use the service life.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the functional block diagram of the control circuit to needle type print head conduction time of an embodiment of the present invention；
Fig. 2 is the circuit diagram of the control circuit shown in FIG. 1 to needle type print head conduction time；
Fig. 3 is the circuit diagram of the driving unit of the control circuit shown in FIG. 1 to needle type print head conduction time；
Fig. 4.For the circuit diagram of the short circuit protection system of an embodiment of the present invention；
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant listed item.
Fixture Design is carried out according to stylus printer complete machine principle, master control borad, power panel are dismantled from complete machine, put
Into in tooling, other components (such as print head, disengaging paper sensor, drive motor) are remained in printer complete machine.It is main
Control plate is connected by thimble and cable with power panel, printer and computer as board under test.
Test philosophy: master control borad (board under test) is placed on tooling needle bed → AC voltage powers on → power panel output DC electricity
Pressure is supplied to master control borad → put print paper, the automatic paper feed → printing test firmware → practical printing effect of inspection.
And there may be insufficient and defects in existing printer, several situations, it is long to be likely to cause print head below
Time is powered and burns: A, the welding procedure that master control borad print-head drive circuit occurs is abnormal, as Darlington transistor dry joint, socket connect
Tin etc..B, master control borad Darlington transistor internal short-circuit.C, FFC winding displacement golden finger falls off, and causes spininess foot short when being inserted into FFC
Road.
When to solve master control borad or abnormal FFC connection, caused by coil energization for a long time and damage print head coil problem,
It can connect one time control circuit in parallel of increase in circuit with print head in master control borad, detect and control print head coil
Conduction time.If print head is powered close to limit time, it will automatic disconnection print head driving voltage is forced, so that protection is beaten
Head coil is printed, it is avoided to overstep the extreme limit conduction time and damage.
Referring to Fig. 1, the control circuit of a kind of pair of needle type print head conduction time, comprising: anti-reverse unit 100, delay
Unit 200, partial pressure unit 300, comparing unit 400, roll-over unit 500 and driving unit 600, the input of the anti-reverse unit
The drive output for connecting printer is held, the output end of the anti-reverse unit and the input terminal of the delay unit are electrically connected
It connects, the output end of the delay unit is electrically connected with the second input terminal of the comparing unit, the input terminal of the partial pressure unit
For connecting external VCC feeder ear, the output end of the partial pressure unit is electrically connected with the first input end of the comparing unit, institute
The output end for stating comparing unit is electrically connected with the roll-over unit, and the input terminal of the roll-over unit and the driving unit is electrically connected
It connects.
It should be noted that the anti-reverse unit 100 is for connecting printer driver output end, the delay unit
200 for realizing delay effect；The partial pressure unit 300 can also be realized for realizing the partial pressure to input voltage
Electric discharge to capacitor；The comparing unit 400 is used to acquire the voltage of drive output, and then can export high level after comparing
Into roll-over unit, so that roll-over unit exports low level, so that disconnecting driving unit output voltage.The roll-over unit 500
For receiving the voltage signal of comparing unit, and then controls the output of driving unit or disconnect output.
In this way, by setting delay unit, comparing unit and roll-over unit, when printer driver end occurs abnormal
Wait, then will not output voltage so that discharging in comparing unit delay unit, and the electricity of the output end of its own
It is flat also to gradually rise, so that roll-over unit exports low level into driving unit after being overturn, so that driving is single
Member disconnects, and entire printer driver voltage is also disconnected；In this way, by detecting and controlling print head coil conduction time, if
Print head is powered close to limit time, it will the automatic print head driving voltage that disconnects is forced to avoid to protect print head coil
It oversteps the extreme limit conduction time and damages.The stability of print head has can be improved in the application, also improves the printer of production
Quality, also improve the service life of printer.
It should be noted that referring to Fig. 2, the anti-reverse unit includes diode D1, the cathode of the diode D1
For connecting the drive output of printer, the anode of the diode D1 is electrically connected with the input terminal of the delay unit.
Referring to Fig. 2, the delay unit includes resistance R1, resistance R2 and capacitor C1, the first end of the resistance R2 with
The output end of the anti-reverse unit is electrically connected, and the second end of the resistance R2 is electrically connected with the first end of the resistance R1, institute
The second end for stating resistance R1 is electrically connected with the second input terminal of the comparing unit.In this way, may be implemented by setting capacitor C1
The effect of delay, and resistance R1 and resistance R2 are set, the effect for dividing and discharging may be implemented.
Referring to Fig. 2, the comparing unit includes first comparator U1A and diode D4, the first comparator U1A's
Crus secunda is electrically connected with the output end of the delay unit, the first foot and the partial pressure unit of the first comparator U1A
Output end electrical connection, the output end of the first comparator U1A are electrically connected with the anode of the diode D4, the diode D4
Cathode be electrically connected with the output end of the roll-over unit.
It should be noted that referring to Fig. 2, the partial pressure unit includes the of resistance R3 and resistance R4, the resistance R3
For connecting external VCC feeder ear, the second end of the resistance R3 is grounded after the resistance R4 for one end, and the of the resistance R3
Two ends are also electrically connected with the third foot of the first comparator U1A.In this way, by setting resistance R3 and resistance R4, it can be by VCC
The voltage that feeder ear partial pressure is 6V.
Referring to Fig. 3, the roll-over unit include the second comparator, resistance R17 and resistance R18, the resistance R17 the
One end is for connecting external VCC feeder ear, and the second end of the resistance R17 is grounded after the resistance R18, and the resistance
The second end of R17 is also electrically connected with the non-inverting input terminal of second comparator.In the present embodiment, second comparator is adopted
With the comparator of model LM324.
Referring to Fig. 3, the driving unit includes triode Q1, relay K1 and diode D8, the triode Q1's
Base stage is electrically connected with the output end of second comparator, the collector of the triode Q1 respectively with the relay K1
The anode of one end and the diode D8 electrical connection, the triode Q1 emitter ground connection, the cathode of the diode D8 with
The second end of the relay K1 is electrically connected.
It should be noted that the driving unit further includes light emitting diode D2, the anode of the light emitting diode D2 with
The collector of the triode Q1 is electrically connected, the minus earth of the light emitting diode D2.
The course of work:
When the conducting of stylus printing drive circuit Darlington transistor, diode D1 is forward conduction, to capacitor C1 electric discharge (C
1 discharge process of capacitor is delay process).The crus secunda level of LM324-U1A chip will be discharged at any time capacitor at this time
C1 charge gradually drags down.Since (it is 12/2=that reference level is arranged in negative terminal to the 3rd foot of chip LM324-U1A setting reference level 6V
6V), therefore output level raising is the charge that capacitor C1 is discharged with the conduction time length of print head coil, to change
The voltage change of 1 foot output end of LM324-U1A chip.
The time that LM324-A chip output 6V is connected with diode D1 when diode D1 is not turned on puts capacitor C1
Electricity, when output level is gradually increased to more than 8V, 6 foot voltage of LM324-U1B group is more than that (reference level is arranged in anode to 5 foot voltages
It is overturn for VCC/ (R1+R10/R10)=8V).Output voltage is low level by high potential overturning, disconnects NPN type triode.
Therefore, relay disconnects (normally opened circuit breaker), forces automatic disconnection print head driving voltage (DC31V), beats so as to protect
Print head coil will not be damaged because going beyond the limit of conduction time.
Referring to Fig. 4, the short circuit protection system of a kind of pair of needle type print head conduction time, including any one of above institute
The control circuit stated.It should be noted that the short circuit protection system includes multiple control circuits being connected in parallel, so as to
The detection for realizing distinct interface, is further ensured that printer can with normal table work.
It is appreciated that producing printer control panel existing abnormal solder and materials issues often, made in certain probability
It is at print head and goes beyond the limit of conduction time print head coil is caused to be damaged.It can effectively be solved because of life in the application
Print head coil caused by the problems such as production, raw material, abnormal wiring goes beyond the limit of conduction time and damages print head.The application may be used also
To avoid there are printer master control borad raw material problems and caused by stylus printing head coil damage, but also can be to avoid production
When Welding Problems caused by print head coil damage problem；It can also avoid beating caused by wire rod damage and tooling wiring simultaneously
It prints head coil and damages problem.
The present invention compared with the prior art the advantages of and have the beneficial effect that:
The present invention is the control circuit and short circuit protection system of a kind of pair of needle type print head conduction time, is delayed by setting
Unit, comparing unit and roll-over unit, when printer driver end occurs abnormal, then will not output voltage so that
It discharges in comparing unit delay unit, and the level of the output end of its own also gradually rises, so that overturning
Output low level is into driving unit after unit is overturn, so that driving unit disconnects, entire printer driver voltage
Also it is disconnected；In this way, by detecting and controlling print head coil conduction time, it, will if print head is powered close to limit time
It can force to disconnect print head driving voltage automatically, to protect print head coil, avoid it from overstepping the extreme limit conduction time and damage.
The stability of print head has can be improved in the application, also improves the quality of the printer of production, also improves making for printer
Use the service life.
Only several embodiments of the present invention are expressed for embodiment described above, and the description thereof is more specific and detailed, but
It cannot be construed as a limitation to the scope of the present invention.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to of the invention
Protection scope.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910077116.8A CN109782668A (en) | 2019-01-27 | 2019-01-27 | Control circuit and short-circuit protection system for the power-on time of needle-type print head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910077116.8A CN109782668A (en) | 2019-01-27 | 2019-01-27 | Control circuit and short-circuit protection system for the power-on time of needle-type print head |
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| Publication Number | Publication Date |
|---|---|
| CN109782668A true CN109782668A (en) | 2019-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910077116.8A Pending CN109782668A (en) | 2019-01-27 | 2019-01-27 | Control circuit and short-circuit protection system for the power-on time of needle-type print head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111332028A (en) * | 2020-03-18 | 2020-06-26 | 厦门汉印电子技术有限公司 | Heating point detection circuit and method of printing head and printer |
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| DE3030827A1 (en) * | 1980-08-13 | 1982-02-25 | Mannesmann AG, 4000 Düsseldorf | Motor monitoring circuit for needle printer - has two comparators connected by threshold diode, with current sensing resistance controlling first comparator |
| US5114252A (en) * | 1989-10-13 | 1992-05-19 | Oki Electric Industry Co., Ltd. | Printer with protection from discharge line disconnection |
| KR20050048912A (en) * | 2003-11-20 | 2005-05-25 | 삼성전자주식회사 | Device and method for preventing damage on print head of inkjet printer |
| CN101121342A (en) * | 2006-08-08 | 2008-02-13 | 三星电子株式会社 | Apparatus to prevent overheating of a print head, and a method thereof |
| CN202169768U (en) * | 2011-07-27 | 2012-03-21 | 上海耀华称重系统有限公司 | Driving circuit of needle type printing head |
| CN103481694A (en) * | 2013-08-22 | 2014-01-01 | 福建联迪商用设备有限公司 | Printing method and equipment of needle printer and needle printer |
| CN106273478A (en) * | 2016-08-09 | 2017-01-04 | 上海悦瑞三维科技股份有限公司 | A kind of temperature-controlled process of the thermal printing head of 3D print system |
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| CN108879593A (en) * | 2018-08-05 | 2018-11-23 | 佛山中锦微电科技有限公司 | A kind of list comparator overcurrent protection driving circuit and generator voltage controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3030827A1 (en) * | 1980-08-13 | 1982-02-25 | Mannesmann AG, 4000 Düsseldorf | Motor monitoring circuit for needle printer - has two comparators connected by threshold diode, with current sensing resistance controlling first comparator |
| US5114252A (en) * | 1989-10-13 | 1992-05-19 | Oki Electric Industry Co., Ltd. | Printer with protection from discharge line disconnection |
| KR20050048912A (en) * | 2003-11-20 | 2005-05-25 | 삼성전자주식회사 | Device and method for preventing damage on print head of inkjet printer |
| CN101121342A (en) * | 2006-08-08 | 2008-02-13 | 三星电子株式会社 | Apparatus to prevent overheating of a print head, and a method thereof |
| CN202169768U (en) * | 2011-07-27 | 2012-03-21 | 上海耀华称重系统有限公司 | Driving circuit of needle type printing head |
| CN103481694A (en) * | 2013-08-22 | 2014-01-01 | 福建联迪商用设备有限公司 | Printing method and equipment of needle printer and needle printer |
| CN106273478A (en) * | 2016-08-09 | 2017-01-04 | 上海悦瑞三维科技股份有限公司 | A kind of temperature-controlled process of the thermal printing head of 3D print system |
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| CN108879593A (en) * | 2018-08-05 | 2018-11-23 | 佛山中锦微电科技有限公司 | A kind of list comparator overcurrent protection driving circuit and generator voltage controller |
| CN209590589U (en) * | 2019-01-27 | 2019-11-05 | 惠州三华工业有限公司 | To the control circuit and short circuit protection system of needle type print head conduction time |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111332028A (en) * | 2020-03-18 | 2020-06-26 | 厦门汉印电子技术有限公司 | Heating point detection circuit and method of printing head and printer |
| CN111332028B (en) * | 2020-03-18 | 2021-07-06 | 厦门汉印电子技术有限公司 | Heating point detection circuit and method of printing head and printer |
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