CN202180648U - Protection circuit of electrocardiogram machine printing head - Google Patents
Protection circuit of electrocardiogram machine printing head Download PDFInfo
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- CN202180648U CN202180648U CN2011201990034U CN201120199003U CN202180648U CN 202180648 U CN202180648 U CN 202180648U CN 2011201990034 U CN2011201990034 U CN 2011201990034U CN 201120199003 U CN201120199003 U CN 201120199003U CN 202180648 U CN202180648 U CN 202180648U
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- electrocardiograph
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Abstract
The utility model discloses a protection circuit of an electrocardiogram machine printing head, comprising a thermo-sensitive printing head. The thermo-sensitive printing head is connected with a temperature detection circuit and a printing head power supply control circuit separately, and the temperature detection circuit and the printing head power supply control circuit are connected with a microprocessor separately. The protection circuit of the electrocardiogram machine printing head of the utility model forms the protection to the printing head via the temperature detection circuit, the printing head power supply control circuit and the microprocessor, thereby achieving the beneficial effects that the temperature influence is avoided, the good printing effect is guaranteed, and the printing figure is clear.
Description
Technical field
The utility model relates to electrocardiograph, specifically is meant a kind of holding circuit of electrocardiograph printhead.
Background technology
Heart is the power set of blood of human body circulation.Automatically constantly carry out rhythmical contraction and diastole activity just because of heart, just make blood in the circulatory system of sealing, ceaselessly flow, life is maintained.Heart is before and after beating, and cardiac muscle takes place exciting.In ignition process, can produce faint bioelectricity.Like this, all being accompanied by biological electricity each cardiac cycle of heart changes.This biological electricity changes each position that can be communicated to body surface.Because health each several part tissue is different, the distance difference that centroid is dirty, electrocardiosignal is also different at the current potential that the health different at different position and different is shown.Concerning normal heart, direction, frequency, intensity that this biological electricity changes are clocklike.If the electrical signal detection of body surface different parts is come out through electrode, amplify with amplifier again, and trace with register, just can obtain EGC pattern.The doctor compares with normal ECG according to the relative time relation between form, wave amplitude size and each ripple of the electrocardiographic wave that is write down again, just can diagnose out heart disease.Beat etc. such as electrocardio irregularity of pulse, miocardial infarction, proiosystole, hypertension, ectocardia.Electrocardiograph is exactly the instrument of the electro-physiological signals that produced when being used for writing down cardiomotility.Because the electrocardiograph diagnostic techniques is ripe, reliable, easy and simple to handle, price is moderate, to advantages such as patient's not damageds, has become one of medical electronic apparatus the most universal in the hospitals at different levels.
The recording mode of electrocardiograph has the following following register of employing at present: 1, moving coil recorder: fixedly magnetic circuit and rotating coil that the structural principle of moving coil recorder is made up of magnet steel.The output signal of electrocardiograph power amplifier is added on the coil of register, is fixed with recording pen on the coil.When electrocardiosignal output was arranged, power amplifier was to the coil output current, and coil rotates.When the deflection angle of coil and saucerspring return zero moment when identical, stop upper deflecting.Like this, the recording pen of coil drive is just traced out electrocardiographic wave on record-paper.2, position feedback register: the position feedback register is a kind of register that need not mechanical clear spring, and special electronic circuit can play the effect of clear spring.During the machine outage, the recording pen of position feedback register can be stirred arbitrarily.3, dot matrix heat-sensitive type register: the heat-sensitive type register is to utilize the semiconductor hot spot of heat-agglomerating on ceramic substrate, on the heat-sensitive paper of meeting the heat colour developing, burns figure and character.
All need dispose printhead for dot matrix heat-sensitive type register, the printhead of existing electrocardiograph is vulnerable to Influence of Temperature, causes printing effect not good, and figure is fuzzy, also often causes the damage of printhead.
The utility model content
The figure that the problem that the utility model need solve provides and a kind ofly avoid temperature effect, guarantee that printing effect is good, print is the holding circuit of electrocardiograph printhead clearly.
The utility model can be realized through following technical scheme:
The utility model discloses a kind of holding circuit of electrocardiograph printhead; Comprise thermal printing head; Described thermal printing head is connected with the printhead power control circuit with temperature sensing circuit respectively, and temperature sensing circuit is connected with microprocessor respectively with the printhead power control circuit.
Preferably, the model of described microprocessor is S3C2440.
Preferably; Described temperature sensing circuit comprises two voltage comparator LM393, resistance R 1, R2, R3, R4 and capacitor C 1; The positive input of two voltage comparator LM393 is connected with the THR1 of thermal printing head end, an end of resistance R 2 and an end of capacitor C 1; Another termination power VCC of resistance R 2, the other end ground connection of capacitor C 1, the reverse input end of two voltage comparator LM393 respectively with being connected of resistance R 1 and R3; Resistance R 4 is connected in parallel between the power end and output of two voltage comparator LM393, and the output of two voltage comparator LM393 is connected with the GPG1 of microprocessor end.
Preferably; Described printhead power control circuit comprises transistor Q1, Q2, resistance R 5, R6, R7, R8, and the colelctor electrode of transistor Q1 is connected with the VTH of thermal printing head end, and the emitter stage of transistor Q1 is connected with power supply; The base stage of transistor Q1 is connected with an end of resistance R 6; The other end of resistance R 6 is connected with the colelctor electrode of transistor Q2, and the base stage of transistor Q2 is connected with an end of resistance R 7, and the other end of resistance R 7 is connected with the GPG4 of microprocessor end; Resistance R 5 also is connected between the emitter stage and base stage of transistor Q1, and resistance R 8 also is connected between the base stage and emitter stage of transistor Q2.
More preferably, described transistor Q1 is the PNP transistor, and transistor Q2 is a NPN transistor.
The holding circuit of the utility model electrocardiograph printhead has constituted the protection to printhead through temperature sensing circuit, printhead power control circuit and microprocessor; The utility model is from the technical scheme of circuit; Guaranteed printhead; After operating temperature raises; The operating voltage of the power supply when realizing the printhead duty through temperature sensing circuit, printhead power control circuit, thus effectively avoid the operating temperature rising of printhead too fast, and little processing realizes the control to temperature sensing circuit, printhead power control circuit.
Description of drawings
Accompanying drawing 1 is the circuit block diagram of the holding circuit of the utility model electrocardiograph printhead;
Accompanying drawing 2 is the circuit diagram of the holding circuit of the utility model electrocardiograph printhead.
The specific embodiment
To combine Figure of description to come the utility model is further described below:
As shown in Figure 1; The utility model discloses a kind of holding circuit of electrocardiograph printhead; Comprise thermal printing head; Described thermal printing head is connected with the printhead power control circuit with temperature sensing circuit respectively, and temperature sensing circuit is connected with microprocessor respectively with the printhead power control circuit.
As shown in Figure 2, the model of described microprocessor is S3C2440.Described temperature sensing circuit comprises two voltage comparator LM393, resistance R 1, R2, R3, R4 and capacitor C 1; The positive input of two voltage comparator LM393 is connected with the THR1 of thermal printing head end, an end of resistance R 2 and an end of capacitor C 1; Another termination power VCC of resistance R 2; The other end ground connection of capacitor C 1; The reverse input end of two voltage comparator LM393 respectively with being connected of resistance R 1 and R3, resistance R 4 is connected in parallel between the power end and output of two voltage comparator LM393, the output of two voltage comparator LM393 is held with the GPG1 of microprocessor and is connected.Described printhead power control circuit comprises transistor Q1, Q2, resistance R 5, R6, R7, R8; The colelctor electrode of transistor Q1 is connected with the VTH of thermal printing head end; The emitter stage of transistor Q1 is connected with power supply, and the base stage of transistor Q1 is connected with an end of resistance R 6, and the other end of resistance R 6 is connected with the colelctor electrode of transistor Q2; The base stage of transistor Q2 is connected with an end of resistance R 7; The other end of resistance R 7 is connected with the GPG4 of microprocessor end, and resistance R 5 also is connected between the emitter stage and base stage of transistor Q1, and resistance R 8 also is connected between the base stage and emitter stage of transistor Q2.Wherein, described transistor Q1 is the PNP transistor, and transistor Q2 is a NPN transistor.
The operation principle of the utility model is: the two voltage comparator LM393 in the temperature sensing circuit are THR1 and the THR1 end from being connected with thermal printing head directly; Change in voltage when obtaining thermal printing head work; Pass to microprocessor S3C2440 from variable signal; Transistor Q1 in the microprocessor S3C2440 control printhead power control circuit, the work of Q2 perhaps end; Thereby realize control, avoid the operating temperature rising of thermal printing head too fast, influence the work and the life-span of thermal printing head the operating voltage of thermal printing head.
The above is merely the preferred embodiment of the utility model, is not the utility model is done any pro forma restriction; But the those of ordinary skill of all industry is all implemented the utility model with the above shown in the by specification accompanying drawing swimmingly; But all professional and technical personnel of being familiar with the above technology contents that is disclosed capable of using and a little change of making, modify the equivalent variations with differentiation in not breaking away from the utility model technical scheme scope, be the equivalent embodiment of the utility model; Simultaneously, all essence technology according to the utility model to the change of any equivalent variations that above embodiment did, modify with differentiation etc., all still belong within the protection domain of technical scheme of the utility model.
Claims (5)
1. the holding circuit of an electrocardiograph printhead; Comprise thermal printing head; It is characterized in that: described thermal printing head is connected with the printhead power control circuit with temperature sensing circuit respectively, and temperature sensing circuit is connected with microprocessor respectively with the printhead power control circuit.
2. the holding circuit of electrocardiograph printhead according to claim 1 is characterized in that: the model of described microprocessor is S3C2440.
3. the holding circuit of electrocardiograph printhead according to claim 2; It is characterized in that: described temperature sensing circuit comprises two voltage comparator LM393, resistance R 1, R2, R3, R4 and capacitor C 1; The positive input of two voltage comparator LM393 is connected with the THR1 of thermal printing head end, an end of resistance R 2 and an end of capacitor C 1; Another termination power VCC of resistance R 2; The other end ground connection of capacitor C 1; The reverse input end of two voltage comparator LM393 respectively with being connected of resistance R 1 and R3, resistance R 4 is connected in parallel between the power end and output of two voltage comparator LM393, the output of two voltage comparator LM393 is held with the GPG1 of microprocessor and is connected.
4. the holding circuit of electrocardiograph printhead according to claim 2; It is characterized in that: described printhead power control circuit comprises transistor Q1, Q2, resistance R 5, R6, R7, R8; The colelctor electrode of transistor Q1 is connected with the VTH of thermal printing head end; The emitter stage of transistor Q1 is connected with power supply, and the base stage of transistor Q1 is connected with an end of resistance R 6, and the other end of resistance R 6 is connected with the colelctor electrode of transistor Q2; The base stage of transistor Q2 is connected with an end of resistance R 7; The other end of resistance R 7 is connected with the GPG4 of microprocessor end, and resistance R 5 also is connected between the emitter stage and base stage of transistor Q1, and resistance R 8 also is connected between the base stage and emitter stage of transistor Q2.
5. the holding circuit of electrocardiograph printhead according to claim 1 is characterized in that: described transistor Q1 is the PNP transistor, and transistor Q2 is a NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201990034U CN202180648U (en) | 2011-06-14 | 2011-06-14 | Protection circuit of electrocardiogram machine printing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201990034U CN202180648U (en) | 2011-06-14 | 2011-06-14 | Protection circuit of electrocardiogram machine printing head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202180648U true CN202180648U (en) | 2012-04-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201990034U Expired - Fee Related CN202180648U (en) | 2011-06-14 | 2011-06-14 | Protection circuit of electrocardiogram machine printing head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202180648U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958441A (en) * | 2016-06-06 | 2016-09-21 | 广东宝莱特医用科技股份有限公司 | Protection circuit and electrocardiogram machine |
| CN106130596A (en) * | 2016-08-10 | 2016-11-16 | 浙江恒业电子有限公司 | Telecommunication circuit for intelligent electric meter |
| CN110861412A (en) * | 2019-11-28 | 2020-03-06 | 湖南凯通电子有限公司 | Printer machine |
-
2011
- 2011-06-14 CN CN2011201990034U patent/CN202180648U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958441A (en) * | 2016-06-06 | 2016-09-21 | 广东宝莱特医用科技股份有限公司 | Protection circuit and electrocardiogram machine |
| CN105958441B (en) * | 2016-06-06 | 2018-08-07 | 广东宝莱特医用科技股份有限公司 | A kind of protection circuit and electrocardiograph |
| CN106130596A (en) * | 2016-08-10 | 2016-11-16 | 浙江恒业电子有限公司 | Telecommunication circuit for intelligent electric meter |
| CN110861412A (en) * | 2019-11-28 | 2020-03-06 | 湖南凯通电子有限公司 | Printer machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120404 Termination date: 20140614 |
|
| EXPY | Termination of patent right or utility model |