CN206561692U - A kind of thermal printing head protection circuit - Google Patents
A kind of thermal printing head protection circuit Download PDFInfo
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- CN206561692U CN206561692U CN201720247219.0U CN201720247219U CN206561692U CN 206561692 U CN206561692 U CN 206561692U CN 201720247219 U CN201720247219 U CN 201720247219U CN 206561692 U CN206561692 U CN 206561692U
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- electric capacity
- resistance
- resistor
- printing head
- thermal printing
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Abstract
The utility model is related to thermal printing head protection circuit, including the first electric capacity, the second electric capacity, the first diode, the second diode, first resistor, second resistance, 3rd resistor, the 4th resistance, NMOS tube, PMOS；First electric capacity first end connection control signal input, the second end connects the first diode negative terminal and the second diode anode；First diode positive ending grounding；Second diode negative terminal connects the second electric capacity first end and NMOS tube grid；Second the second end of electric capacity is grounded；First resistor is parallel to the second electric capacity two ends；The source ground of NMOS tube, drain electrode connection 3rd resistor first end；The end of 3rd resistor second connects second resistance first end；The end of second resistance second connects working power；The source electrode connection working power of PMOS, the source of drain electrode connection thermal printing head, grid connection 3rd resistor second end；4th resistor coupled in parallel is between the source and ground terminal of thermal printing head.Printhead is protected during for abnormal input.
Description
Technical field
The utility model is related to electronic circuit field, more particularly to a kind of thermal printing head protection circuit.
Background technology
Present thermal printer is widely used, relative to impact printer, and thermal printer has that print speed is fast, noise
Low, printing is clear, the advantages of easy to use.But during the use of thermal printer, often because of control signal input
Print control logical signal entanglement when breaking down or debug, causes thermal printing head to be burned out.
Utility model content
The purpose of this utility model is to overcome the shortcoming of prior art, and there is provided a kind of thermal printing head protection circuit.
In order to solve the above technical problems, the technical solution adopted in the utility model is：
A kind of thermal printing head protection circuit, including the first electric capacity, the second electric capacity, the first diode, the second diode,
One resistance, second resistance, 3rd resistor, the 4th resistance, NMOS tube, PMOS；The first end connection control of first electric capacity
Signal input part, the second end connects the negative terminal of first diode and the anode of second diode；One or two pole
The positive ending grounding of pipe；The negative terminal of second diode connects the first end of second electric capacity and the grid of the NMOS tube；
The second end ground connection of second electric capacity；The first resistor is parallel to the second electric capacity two ends, forms discharge loop；It is described
The source ground of NMOS tube, the first end of the drain electrode connection 3rd resistor；The second end connection described the of the 3rd resistor
The first end of two resistance；The second end connection working power of the second resistance；The source electrode connection working power of the PMOS,
The source of drain electrode connection thermal printing head, grid connects the second end of the 3rd resistor；4th resistor coupled in parallel is in described
Between the source and ground terminal of thermal printing head, discharge loop is formed.
As a further improvement, the control signal input connection thermal printer main control chip I/O port；The temperature-sensitive
Printer main control chip I/O port output pwm signal is to the control signal input.
As a further improvement, first electric capacity and second electric capacity use ceramic disc capacitor.
As a further improvement, first electric capacity uses ceramic disc capacitor 104；Second electric capacity uses ceramic disc capacitor
103。
As a further improvement, the resistance of the first resistor uses 1M Ω.
As a further improvement, the second resistance and the 3rd resistor resistance value ratio 75%~85%.
As a further improvement, the second resistance resistance takes 10K Ω；The 3rd resistor resistance takes 12K Ω.
Compared with prior art, the utility model has advantages below：The thermal printing head protection electricity of the utility model
Road, can control signal input break down i.e. in often it is high, often low or high resistant when, effectively prevent working power on electricity to heat
Quick printhead is so as to cause thermal printing head to be burned out.
Brief description of the drawings
Accompanying drawing is used for providing further understanding to of the present utility model, and constitutes a part for specification, with this practicality
New embodiment is used for explaining the utility model together, does not constitute to limitation of the present utility model.
Accompanying drawing 1 is a kind of circuit theory diagrams of thermal printing head protection circuit of the utility model.
Main element symbol description
Operating voltage 10
Embodiment
To make the purpose, technical scheme and advantage of the utility model embodiment clearer, below in conjunction with this practicality
Accompanying drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described.
, it is necessary to illustrate in description of the present utility model, herein, such as first and second or the like relation
Term is used merely to make a distinction an entity or operation with another entity or operation, and not necessarily requires or imply
There is any this actual relation or order between these entities or operation.Moreover, term " comprising ", "comprising" or its
Any other variant is intended to including for nonexcludability so that process, method, article including a series of key elements or
Equipment not only includes those key elements, but also other key elements including being not expressly set out, or also include be this process,
Method, article or the intrinsic key element of equipment.In the absence of more restrictions.By sentence " including one ... limit
Fixed key element, it is not excluded that also there is in addition identical in the process including the key element, method, article or equipment will
Element ".
The correlation module being related in the system is hardware system module or is prior art Computer Software journey
The functional module that sequence or agreement are combined with hardware, computer software programs or agreement involved by the functional module itself
The technology being well known to those skilled in the art, it is not the improvements of the system；The system is improved between each module
Interaction relationship or annexation, be that the overall construction of system is improved, to be solved with solving the system
Relevant art problem.
Below in conjunction with drawings and embodiments is made to a kind of thermal printing head protection circuit of the present utility model specific be situated between
Continue.
Referring to Fig. 1, a kind of thermal printing head protection circuit, including the first electric capacity C1, the second electric capacity C2, the first diode
D1, the second diode D2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, NMOS tube Q1, PMOS
Q2；The first end connection control signal input of the first electric capacity C1, the second end connects the negative terminal of the first diode D1
And the anode of the second diode D2；The positive ending grounding of the first diode D1；The negative terminal of the second diode D2 connects
Connect the first end of the second electric capacity C2 and the grid of the NMOS tube Q1；The second end ground connection of the second electric capacity C2；It is described
First resistor R1 is parallel to the second electric capacity C2 two ends, forms discharge loop；The source ground of the NMOS tube Q1, drain electrode connects
Connect the first end of the 3rd resistor R3；The second end of the 3rd resistor R3 connects the first end of the second resistance R2；Institute
State second resistance R2 the second end connection working power VIN；The source electrode connection working power VIN of the PMOS Q2, drain electrode connects
The source VH of thermal printing head is met, grid connects the second end of the 3rd resistor R3；The 4th resistance R4 is parallel to described
Between the source VH and ground terminal of thermal printing head, discharge loop is formed.
Further, in the utility model preferred embodiment, the control signal input connects thermal printer
Main control chip I/O port；The thermal printer main control chip I/O port output pwm signal is to the control signal input.
Above-described embodiment is when it is implemented, when print job starts, the control signal input inputs one properly
Pwm signal, pwm signal be in high level state when, the first electric capacity C1 and the first diode D1 formation electric charge
Pump circuit is charged to the second electric capacity C2, and the grid voltage of the NMOS tube Q1 is met when the second electric capacity C2 is charged to
During Vgs threshold voltages, the NMOS tube Q1 conductings；The NMOS tube Q1, which is turned on, causes the second resistance R2 and the 3rd electricity
R3 is hindered to working power VIN formation bleeder circuits；At this moment the partial pressure on the 3rd resistor R3 causes the PMOS Q2 to reach
Vgs and turn on, with the conducting of the PMOS Q2, working power VIN is connected to the source VH of thermal printing head so that temperature-sensitive
On printhead electricity and work.And when pwm signal is in low level state, the first electric capacity C1 is through the first diode D1
Repid discharge is carried out, in case the first electric capacity C1 can be continued through when next high level of pwm signal arrives to described
Second electric capacity C2 charges, to ensure that the grid voltage of the NMOS tube Q1 is stable, so that the NMOS tube Q1 and PMOS
Pipe Q2 normallies so that thermal printing head steady operation.The second diode D2 is to prevent the second electric capacity C2
When pwm signal is in low level state by the first diode D1 repid discharges, cause the grid of the NMOS tube Q1
Voltage is quickly reduced, so as to cause the NMOS tube Q1 and PMOS Q2 to end, influences thermal printing head steady operation.This
In the first resistor R1 using the higher resistance of resistance, the velocity of discharge for controlling the second electric capacity C2, to ensure
The grid voltage for stating NMOS tube Q1 meets Vgs, uses the NMOS tube Q1 and the PMOS Q2 normallies.Work as print job
After the completion of, the control signal input stops input pwm signal, and the second electric capacity C2 is discharged by the first resistor R1
Afterwards, end the NMOS tube Q1 and PMOS Q2, remaining electricity passes through the 4th resistance R4 on thermal printing head
Discharged, thermal printing head is stopped.
If in print procedure or when printing starts, there is the i.e. described control of abnormal input in the control signal input
Signal input part processed be in often it is high, often low or high-impedance state, or debugging when there is logical signal entanglement, at this moment by
In the separated by direct communication characteristic of the first electric capacity C1, spectral artifacts can not all open the NMOS tube Q1, so as to can not open
The PMOS Q2, working power VIN will not access the source VH of thermal printing head, so as to play the work of protection thermal printing head
With.
Further, in the utility model preferred embodiment, the first electric capacity C1 and the second electric capacity C2 are adopted
Use ceramic disc capacitor.Ceramic disc capacitor has stability good, and good reliability is nonpolarity, low cost, the advantages of high temperature resistant.
Further, in the utility model preferred embodiment, preferential, the first electric capacity C1 uses ceramic disc capacitor
104 i.e. 0.1UF；The second electric capacity C2 is 0.01UF using ceramic disc capacitor 103.
Further, the first resistor R1 is used to control the velocity of discharge of the second electric capacity C2, during value it is considered that
In the pwm signal low level and before the arrival of next high level, the velocity of discharge of the second electric capacity C2 ensures described
NMOS tube Q1 grid voltage meets Vgs and turned on, while consideration is taken into account, after the completion of printer work, second electricity
Hold C2 electric discharge shut-offs NMOS tube Q1 delay time.Preferential, in the utility model preferred embodiment, described first
Resistance R1 resistance uses 1M Ω.
Further, the second resistance R2 and the 3rd resistor R3 value will cause the Vgs of the PMOS Q2
It is sufficiently large to ensure that the PMOS Q2 can be fully on, it is ensured that the life-span of product.Preferential, it is preferably real in the utility model
Apply in example, the second resistance R2 and the 3rd resistor R3 resistance value ratios 75%~85%.
Further, in the utility model preferred embodiment, preferential, the second resistance R2 resistances take 10K Ω；
The 3rd resistor R3 resistances take 12K Ω.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements done etc. should be included in the utility model
Within the scope of protection.
Claims (7)
1. a kind of thermal printing head protection circuit, it is characterised in that：Including the first electric capacity, the second electric capacity, the first diode, second
Diode, first resistor, second resistance, 3rd resistor, the 4th resistance, NMOS tube, PMOS；
The first end connection control signal input of first electric capacity, the second end connects negative terminal and the institute of first diode
State the anode of the second diode；The positive ending grounding of first diode；The negative terminal connection described second of second diode
The grid of the first end of electric capacity and the NMOS tube；The second end ground connection of second electric capacity；
The first resistor is parallel to the second electric capacity two ends, forms discharge loop；
The source ground of the NMOS tube, the first end of the drain electrode connection 3rd resistor；Second end of the 3rd resistor connects
Connect the first end of the second resistance；The second end connection working power of the second resistance；
The source electrode connection working power of the PMOS, the source of drain electrode connection thermal printing head, grid connection the 3rd electricity
Second end of resistance；
4th resistor coupled in parallel forms discharge loop between the source and ground terminal of the thermal printing head.
2. thermal printing head protection circuit according to claim 1, it is characterised in that：The control signal input connection
Thermal printer main control chip I/O port；The thermal printer main control chip I/O port output pwm signal is defeated to the control signal
Enter end.
3. thermal printing head protection circuit according to claim 1, it is characterised in that：First electric capacity and described second
Electric capacity uses ceramic disc capacitor.
4. thermal printing head protection circuit according to claim 3, it is characterised in that：First electric capacity is using ceramics electricity
Hold 104；Second electric capacity uses ceramic disc capacitor 103.
5. thermal printing head protection circuit according to claim 1, it is characterised in that：The resistance of the first resistor is used
1MΩ。
6. thermal printing head protection circuit according to claim 1, it is characterised in that：The second resistance and the described 3rd
Resistance is than 75%~85%.
7. thermal printing head protection circuit according to claim 6, it is characterised in that：The second resistance resistance takes 10K
Ω；The 3rd resistor resistance takes 12K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720247219.0U CN206561692U (en) | 2017-03-14 | 2017-03-14 | A kind of thermal printing head protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720247219.0U CN206561692U (en) | 2017-03-14 | 2017-03-14 | A kind of thermal printing head protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206561692U true CN206561692U (en) | 2017-10-17 |
Family
ID=60030758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720247219.0U Active CN206561692U (en) | 2017-03-14 | 2017-03-14 | A kind of thermal printing head protection circuit |
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| CN (1) | CN206561692U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111835321A (en) * | 2020-06-10 | 2020-10-27 | 深圳圣德京粤科技有限公司 | Pulse width limiting circuit and method |
-
2017
- 2017-03-14 CN CN201720247219.0U patent/CN206561692U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111835321A (en) * | 2020-06-10 | 2020-10-27 | 深圳圣德京粤科技有限公司 | Pulse width limiting circuit and method |
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