CN204077073U - Heating protection circuit - Google Patents
Heating protection circuit Download PDFInfo
- Publication number
- CN204077073U CN204077073U CN201420374270.4U CN201420374270U CN204077073U CN 204077073 U CN204077073 U CN 204077073U CN 201420374270 U CN201420374270 U CN 201420374270U CN 204077073 U CN204077073 U CN 204077073U
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- CN
- China
- Prior art keywords
- oxide
- metal
- semiconductor
- shower nozzle
- connects
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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Abstract
The utility model proposes a kind of shower nozzle heating protection circuit and comprise a computer heating control end; one photoelectrical coupler and one first metal-oxide-semiconductor; computer heating control end is connected with the first metal-oxide-semiconductor by photoelectrical coupler; the output of the first metal-oxide-semiconductor connects shower nozzle; it is characterized in that; also comprise an electric capacity, one end of electric capacity connects a pin of the input of photoelectrical coupler, and the other end of electric capacity connects computer heating control end.Shower nozzle heat driven protection circuit of the present utility model can utilize when computer heating control end is out of control electric capacity biography exchange stopping direct current characteristic by under the voltage drop of shower nozzle heat driven thus stop to shower nozzle heating, prevent long-time heating from being damaged by shower nozzle.
Description
Technical field
The utility model relates to a kind of heating protection circuit, relates to a kind of ink-jet printer shower nozzle heating protection circuit specifically.
Background technology
In recent years because inkjet printing has higher print speed and excellent image resolution ratio, and ink jet printing device combines with computer, the flexibility of the design that makes final image and layout aspect is comparatively large, makes the popularity of inkjet technology more and more higher.
Existing inkjet technology comprises piezoelectric ink jet printing technique and thermal foam formula inkjet technology.Piezoelectric ink jet printing technique is placed near spray nozzle by many little piezoelectric ceramics, utilize piezoelectric ceramics that the principle of deformation can occur under voltage effect, in time voltage is added to above it, piezoelectric ceramics is produced flexible, and then the ink in nozzle is sprayed, at output medium image forming surface.The flexible vibrations of piezoelectric ceramics change along with the change of voltage, size and the mode of ink droplet is effectively regulated by control voltage, make ink under the stable state of normal temperature and pressure, evenly spray ink accurately, thus obtain the printout image of degree of precision and resolution ratio, reduce the consumption of ink simultaneously.The jet speed of shower nozzle except the slope of driving voltage rising edge and trailing edge, also by the impact of the viscosity of ink in black chamber.The viscosity of ink is relevant to heating-up temperature again, for ensureing that ink viscosity is in particular range, inkjet printer head is all provided with system for heating spray head, to make it work under suitable heating-up temperature, to print high-quality image.The general electric heating system that adopts heats shower nozzle at present, heating system comprises heating tube, temperature sensor, overheat protector and control circuit board etc., during heating system work, heating tube energising is directly heated shower nozzle, when temperature reaches the design temperature of shower nozzle work, temperature sensor sends a signal to control circuit board, then controls heating tube power-off by control circuit board, stops heating shower nozzle; When temperature is lower than shower nozzle operation setup temperature, control circuit board again controls heating tube energising and heats shower nozzle, and iterative cycles like this heats to ensure that nozzle temperature is in normal working range to shower nozzle.When temperature exceeds the normal range of operation of shower nozzle, the lighter makes ink generation chemical change, affects quality of ink jet printed images, heavy then damage shower nozzle.As shown in Figure 1, FPGA or ARM is adopted to control the heating of shower nozzle by a photoelectrical coupler O1 and field-effect transistor Q2 in prior art; And field-effect transistor Q2 opens and heats shower nozzle when FPGA or ARM exports high level.Once FPGA or ARM out of control and when export high level crash, shower nozzle by continue heated, cause shower nozzle to be burned.As shown in Figure 2, the oscillogram of shower nozzle heat driven voltage V1 of the prior art, when T1 time FPGA or ARM crashes, after the T1 time, shower nozzle heat driven voltage keeps is high level shower nozzle continuous heating, easily causes shower nozzle to damage.
Summary of the invention
For problems of the prior art, the purpose of this utility model is to provide a kind of anti-shower nozzle heating protection circuit adding thermal runaway.
For achieving the above object, the utility model proposes a kind of shower nozzle heating protection circuit, comprise a computer heating control end, one photoelectrical coupler and one first metal-oxide-semiconductor, computer heating control end is connected with the first metal-oxide-semiconductor by photoelectrical coupler, and the output of the first metal-oxide-semiconductor connects shower nozzle, it is characterized in that, also comprise an electric capacity, the first diode and the second diode, one end of electric capacity connects a pin of the input of photoelectrical coupler, another termination earth terminal of electric capacity; One end of electric capacity also connects computer heating control end by the first diode, and the first diode also connects earth terminal by the second diode.One pin of the output of described photoelectrical coupler connects the grid of described first metal-oxide-semiconductor, and the source electrode of the first metal-oxide-semiconductor connects earth terminal, and the drain electrode of the first metal-oxide-semiconductor connects nozzle end, the grid of described first metal-oxide-semiconductor be connected in series one the 3rd resistance between source electrode.Described photoelectrical coupler is photodiode type.
Shower nozzle heating protection circuit of the present utility model also comprises one second metal-oxide-semiconductor; described second metal-oxide-semiconductor connects the output of photoelectrical coupler; the source electrode of described second metal-oxide-semiconductor connects heating supply voltage; the grid of the second metal-oxide-semiconductor connects heated protective end, and the drain electrode of the second metal-oxide-semiconductor connects another pin of the output of photoelectrical coupler by the first resistance.
Shower nozzle heat driven protection circuit of the present utility model can utilize when computer heating control end is out of control electric capacity biography exchange stopping direct current characteristic by under the voltage drop of shower nozzle heat driven thus stop to shower nozzle heating, prevent long-time heating from being damaged by shower nozzle.
Accompanying drawing explanation
Fig. 1 is shower nozzle heat driven circuit diagram of the prior art;
Fig. 2 is the heat driven voltage oscillogram of situation lower nozzle out of control at control end in prior art;
Fig. 3 is the shower nozzle heat driven circuit diagram in the utility model;
Fig. 4 is the heat driven voltage oscillogram of situation lower nozzle out of control at control end in the utility model.
Main element symbol description
Logic feeder ear-VCC; Shower nozzle heating input terminal voltage-VHEAT; Shower nozzle heating output end voltage-VHEAT-AB; Earth terminal-GND; Shower nozzle computer heating control end-HTON; First metal-oxide-semiconductor-Q1; Second metal-oxide-semiconductor-Q2; Light emitting diode-D1; First diode-D2; Second diode-D3; Electric capacity-C1; First resistance-R1; Second resistance-R2; Three resistance-R3; Four resistance-R4; Photoelectrical coupler-O1; Grid-G; Source electrode-S; Drain electrode-D.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 3, shower nozzle heat driven circuit of the present utility model comprises the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2, shower nozzle heating input terminal voltage VHEAT accesses shower nozzle heating protection circuit by the second metal-oxide-semiconductor Q2, shower nozzle heating input terminal voltage VHEAT connects the source S of the second metal-oxide-semiconductor Q2, the grid D of the second metal-oxide-semiconductor Q2 connects heated protective end, the drain D (also namely shower nozzle heats output end voltage VHEAT-AB) of the second metal-oxide-semiconductor Q2 connects 4 pins of photoelectrical coupler O1 output by the first resistance R1, 3 pins of the output of photoelectrical coupler O1 connect the grid G of the first metal-oxide-semiconductor Q1, 3 pins of photoelectrical coupler O1 output also meet earth terminal GND by the 3rd resistance R3, the direct earth terminal GND of 2 pin of photoelectrical coupler O1 input, 1 pin of photoelectrical coupler O1 input meets earth terminal GND by electric capacity C1, 1 pin of photoelectrical coupler O1 input also connects the negative electrode of the first diode D2, the anode of the first diode D2 meets computer heating control end HTON by the second resistance R2, the anode of the first diode D2 also connects the negative electrode of the second diode D3, the anode of the second diode D3 meets earth terminal GND.The drain D of the first metal-oxide-semiconductor Q1 connects shower nozzle, and the grid G of the first metal-oxide-semiconductor Q1 connects the source S of the first metal-oxide-semiconductor Q1 by the 3rd resistance R3.The drain D of the first metal-oxide-semiconductor Q1 is also by the negative electrode of the 4th resistance R4 sending and receiving optical diode D1, and the anode of light emitting diode D1 meets shower nozzle heating output end voltage VHEAT-AB.Wherein, the first diode D1 plays rectifying and wave-filtering effect, and the second diode D2 plays bigoted effect.
When normal work is heated to shower nozzle, computer heating control end TCON gives a heating signal, 3 pin of output and 4 pin conductings after on the light-receiving device that the lumination of light emitting diode of the input of photoelectrical coupler O1 is irradiated to output, the grid G of the first metal-oxide-semiconductor Q1 is high level, the source S ground connection of the first metal-oxide-semiconductor Q1 is low level, first metal-oxide-semiconductor Q1 conducting, shower nozzle heating output end voltage VHEAT-AB supplies shower nozzle by the second metal-oxide-semiconductor Q2 and the first metal-oxide-semiconductor Q1, carries out heating work to shower nozzle.
When T1 time FPGA or ARM crashes; the oscillogram of the shower nozzle heat driven voltage V2 in the utility model as shown in Figure 4; because electric capacity C1 has the effect passing and exchange stopping direct current; shower nozzle heat driven voltage V2 from the T1 time through reducing to zero and stop heating shower nozzle after a period of time; namely shower nozzle heat driven protection circuit of the present utility model can utilize when computer heating control end is out of control electric capacity biography exchange stopping direct current characteristic by under the voltage drop of shower nozzle heat driven thus stop to shower nozzle heating, prevent long-time heating from being damaged by shower nozzle.
It is to be noted and any distortion done according to detailed description of the invention of the present utility model all do not depart from the scope of spirit of the present utility model and claim record.
Claims (6)
1. a heating protection circuit; comprise a computer heating control end; one photoelectrical coupler and one first metal-oxide-semiconductor; computer heating control end is connected with the first metal-oxide-semiconductor by photoelectrical coupler; the output of the first metal-oxide-semiconductor connects shower nozzle, it is characterized in that, also comprises an electric capacity; one end of electric capacity connects a pin of the input of photoelectrical coupler, and the other end of electric capacity connects computer heating control end.
2. heating protection circuit as claimed in claim 1, is characterized in that, be also connected one first diode between described electric capacity with computer heating control end.
3. heating protection circuit as claimed in claim 2, is characterized in that, also comprise one second diode, and one end of described second diode connects described first diode, another termination earth terminal of described second diode.
4. heating protection circuit as claimed in claim 1; it is characterized in that; one pin of the output of described photoelectrical coupler connects the grid of described first metal-oxide-semiconductor; the source electrode of the first metal-oxide-semiconductor connects earth terminal; the drain electrode of the first metal-oxide-semiconductor connects nozzle end, the grid of described first metal-oxide-semiconductor be connected in series one the 3rd resistance between source electrode.
5. heating protection circuit as claimed in claim 1; it is characterized in that; also comprise one second metal-oxide-semiconductor; described second metal-oxide-semiconductor connects the output of photoelectrical coupler; the source electrode of described second metal-oxide-semiconductor connects heating supply voltage; the grid of the second metal-oxide-semiconductor connects heated protective end, and the drain electrode of the second metal-oxide-semiconductor connects another pin of the output of photoelectrical coupler by the first resistance.
6. heating protection circuit as claimed in claim 1, it is characterized in that, described photoelectrical coupler is photodiode type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420374270.4U CN204077073U (en) | 2014-07-08 | 2014-07-08 | Heating protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420374270.4U CN204077073U (en) | 2014-07-08 | 2014-07-08 | Heating protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204077073U true CN204077073U (en) | 2015-01-07 |
Family
ID=52169829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420374270.4U Withdrawn - After Issue CN204077073U (en) | 2014-07-08 | 2014-07-08 | Heating protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204077073U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104085189A (en) * | 2014-07-08 | 2014-10-08 | 北京美科艺数码科技发展有限公司 | Heating protective circuit |
| CN108284265A (en) * | 2017-10-20 | 2018-07-17 | 秦辉 | Fully automatic electric soldering iron |
-
2014
- 2014-07-08 CN CN201420374270.4U patent/CN204077073U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104085189A (en) * | 2014-07-08 | 2014-10-08 | 北京美科艺数码科技发展有限公司 | Heating protective circuit |
| CN104085189B (en) * | 2014-07-08 | 2016-09-14 | 北京美科艺数码科技发展有限公司 | heating protection circuit |
| CN108284265A (en) * | 2017-10-20 | 2018-07-17 | 秦辉 | Fully automatic electric soldering iron |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150107 Effective date of abandoning: 20160914 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |