CN109849526A - Thermal printhead heats voltage control circuit and printing device - Google Patents
Thermal printhead heats voltage control circuit and printing device Download PDFInfo
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- CN109849526A CN109849526A CN201811639295.1A CN201811639295A CN109849526A CN 109849526 A CN109849526 A CN 109849526A CN 201811639295 A CN201811639295 A CN 201811639295A CN 109849526 A CN109849526 A CN 109849526A
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- 238000007639 printing Methods 0.000 title claims description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 73
- 238000005070 sampling Methods 0.000 claims abstract description 66
- 230000005669 field effect Effects 0.000 claims description 37
- 230000000694 effects Effects 0.000 claims description 14
- 238000007651 thermal printing Methods 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 10
- 229910052744 lithium Inorganic materials 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The present invention provides a kind of thermal printhead heats voltage control circuit comprising electric pressure converter, sampling feedback module, control module and adjustment module；The electric pressure converter is connect with the sampling feedback module, and the sampling feedback module is connect with the adjustment module, and the control module is also connect with the sampling feedback module and the adjustment module；The electric pressure converter is for converting the supply voltage for carrying out self powered supply and exporting heating voltage；The sampling feedback module is for acquiring the heating voltage；The control module simultaneously is used to pass through the adjustment module control heating voltage according to the supply voltage.
Description
Technical field
The present invention relates to printer field more particularly to a kind of thermal printhead heats voltage control circuits and printing to set
It is standby.
Background technique
In general, the heating voltage of thermal printer is fixed as some voltage value.For example, the temperature-sensitive of 24V adapter power supply
Printer, heating voltage are fixed as 17V by electric pressure converter.In this case, if using five section lithium batteries to printing
Machine power supply, with battery discharge, input voltage may be in the range of 21V~17.5V.When supply voltage is close to 17.5V
When, since pressure difference is too small, electric pressure converter is difficult to stablize heating voltage in 17V.Therefore, if heating voltage is still set as solid
Fixed 17V then inevitably will appear heating concentration variation, so that printing effect is deteriorated.If when arriving battery power supply in order to balance
Voltage change, and heating voltage is fixed as 15V, then it can guarantee that the power supply of 24V adapter and five section lithium batteries are supplied to printer
When electric, heating voltage can be stablized.But the problem of this brings is: the power supply of 24V adapter is converted to 15V heating voltage, efficiency
It is lower.Moreover, heating voltage of the heating voltage of 15V compared to 17V, will realize identical gradation of drop-out colour, it may be desirable to expend more
More print times.Generally speaking, the thermal printer of fixed heating voltage, it is difficult to take into account power supply voltage range it is wider when,
Printing effect and printing effect are taken into account.
Summary of the invention
In order to solve the above technical problems, the present invention provide a kind of thermal printhead heats voltage control circuit and because
Make the adjustable printing device of heating voltage with the control circuit.The control circuit can control adding for thermal printing head
Heating voltage is set different fixed values by thermal voltage, to take into account thermal printing head in different power supply voltage ranges
Effect and efficiency.
More specifically, providing a kind of thermal printhead heats voltage control circuit in the first aspect of the invention.The control
Circuit processed includes electric pressure converter, sampling feedback module, control module and adjustment module；The electric pressure converter with it is described
The connection of sampling feedback module, the sampling feedback module connect with the adjustment module, the control module also with the sampling
Feedback module and adjustment module connection；The electric pressure converter is for converting the supply voltage for carrying out self powered supply and output
Heating voltage；The sampling feedback module is for acquiring the heating voltage；The control module is simultaneously used for according to the power supply
Voltage controls the heating voltage by the adjustment module.
Further, the sampling feedback module includes the first sampling resistor and the second sampling resistor；Wherein, described first
Sampling resistor is connect with the feedback end of the electric pressure converter, for acquiring feedback voltage；Second sampling resistor with it is described
The heating voltage output end of electric pressure converter connects, for acquiring the heating voltage；First sampling resistor and described the
It is grounded after the series connection of two sampling resistors；The adjustment module includes adjusting resistance and switch element, adjusting resistance one end ground connection,
The other end is accessed between first sampling resistor and second sampling resistor by the switch element, and with described the
One sampling resistor is in parallel；The control module controls the opening and closing of the switch element by controlling signal, and then controls
The connection for adjusting resistance and the sampling feedback module.
Further, the switch element includes the first field-effect tube, wherein the grid of first field-effect tube and institute
Control module connection is stated, the drain electrode of first field-effect tube is connect with the adjusting resistance, the source of first field-effect tube
Pole is connect with first sampling resistor.
Further, the switch element further includes the second field-effect tube, wherein the grid of second field-effect tube with
The control module connection, the source electrode of second field-effect tube are connect with the drain electrode of first field-effect tube, and described second
The drain electrode of field-effect tube is connect with first sampling resistor.
Further, the control module determines the low and high level state of the control signal by the feedback voltage；
The low and high level state of the control signal is used to control the opening and closing of the switch element.
Preferably, the adjusting resistance is the adjustable resistance of resistance value.
Further, it is in series with a pull-up resistor in the control module to the path of first fet gate,
And it is parallel with a ground capacity simultaneously.
A kind of printing device is provided in the second aspect of the present invention, the printing device include power supply, thermal printing head with
And the thermal printhead heats voltage control circuit as described in above-mentioned first aspect.Wherein, the input terminal of the control circuit
It is connect with the power supply, the output end of the control circuit is connect with the thermal printing head.
The beneficial effects of the present invention are by introducing adjustment module and control module, so that power adapter is exported
Heating voltage become the variable that can specifically adjust according to the actual situation.When the voltage that external power supply is supplied is sufficiently high, control
Molding block can instruct adjustment module to be adjusted, and the heating voltage of power adapter is fixed as high value, and then improve and add
The printing effect of thermal printer head；And when monitoring voltage drop provided by external power supply down to certain threshold value, control module is again
The heating voltage of power adapter can be fixed as lower value, avoided due to nothing by instructing the adjustment module to be adjusted
Method stablizes heating voltage and causes heating concentration variation, and finally influences printing effect.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention
Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is the system schematic of printing device in one embodiment of the invention.
Fig. 2 is the module diagram of thermal printhead heats voltage control circuit in one embodiment of the invention.
Fig. 3 is the circuit diagram of thermal printhead heats voltage control circuit in one embodiment of the invention.
Fig. 4 is the circuit diagram of thermal printhead heats voltage control circuit in another embodiment of the present invention.
Fig. 5 is the circuit diagram of thermal printhead heats voltage control circuit in further embodiment of this invention.
Specific embodiment
To keep the purposes, technical schemes and advantages of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to the present invention
The range of protection.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present invention of protection is sought, but is merely representative of selected embodiment of the invention.Based on the embodiment in the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Invent the range of protection.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.
In the present invention unless specifically defined or limited otherwise, term " connected ", " connection ", etc. terms should do broad sense
Understand, for example, it may be mechanical connection, is also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements or the interaction relationship of two elements.For the ordinary skill people of this field
For member, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
Referring to fig. 2, first embodiment of the invention provides a kind of thermal printhead heats voltage control circuit 11.Control electricity
Road 11 includes control module 111, electric pressure converter 112, sampling feedback module 113 and adjustment module 114；The voltage turns
Parallel operation 112 is connect with the sampling feedback module 113, and the sampling feedback module 113 is connect with the adjustment module 114, institute
Control module 111 is stated also to connect with the sampling feedback module 113 and the adjustment module 114；The electric pressure converter 112
Carry out the supply voltage of self powered supply for converting and export heating voltage；The sampling feedback module 113 is described for acquiring
Heating voltage；The control module 111 simultaneously is used to control the heating by the adjustment module 114 according to the supply voltage
Voltage.More specifically, as in Figure 3-5, control module 111 is connected to adjustment module 114 by control terminal 1111.
In the present embodiment, it can be 24V adapter for the power supply that the control circuit 12 provides electric energy, be also possible to more
Save lithium battery.It is understood that 24V power supply adaptor is the power supply conversion equipment of electronic equipment and electronic apparatus, lead to
Often exchange input can be converted into direct current output.For example, under the standard of China's 220V alternating current, the power supply adaptor energy
It is enough that the alternating current of 220V is converted into being suitable for the 24V voltage that printer described herein uses.In another case, power supply
It is also possible to the power supply of multisection lithium battery composition.For example, in the present embodiment, can be 5 section 4.2V lithium batteries.Ideal feelings
Under condition, 5 section 4.2V lithium batteries can directly export the DC voltage of 21V, be supplied to electronic equipment to use, for example, described herein
Thermal printhead heats voltage control circuit.It is appreciated that power supply described herein and be not secured to 24V power supply adaptor or
5 section 4.2V lithium batteries can also be that other can convert out or generate the power supply of similar DC voltage.Similarly, real life
In, power supply also tends to be that multiple types are jointly compatible, such as power supply adaptor not only can be used and be powered but also can be with
Use the laptop etc. of lithium battery power supply.In the present invention, the control circuit can also be compatible with power adaptation simultaneously
The power supply of device and lithium battery.It is appreciated that in the present embodiment, control module 111 can use Micro-processor MCV or centre
Manage the integrated chip with data-handling capacity such as device CPU.
In the present embodiment, the electric pressure converter 121 in control circuit is for converting the supply voltage from power supply and defeated
Biggish supply voltage is exported and is stabilized to the heating electricity for the temperature-sensitive heating head for being suitable for printing device by heating voltage out
Pressure.It is appreciated that the input voltage for inputting it can be effectively converted into another fixed voltage by electric pressure converter 121.At this
In embodiment, electric pressure converter 121 can be buck converter.By taking 24V power supply adaptor as an example, 220V alternating current is suitable through power supply
Conversion is in the supply voltage of 24V after orchestration；Supply voltage is defeated by into control circuit, and is input to electric pressure converter 121.Electricity
Pressure converter 121 can its supply voltage of 24V is converted and is fixed into the 17V heating electricity for being suitable for that temperature-sensitive heating head uses
Pressure.Similarly, the voltage that multisection lithium battery is powered can also be converted and be fixed by electric pressure converter 121 is suitable for temperature-sensitive heating head
The heating voltage used.
In the present embodiment, the sampling feedback module 113 in control circuit 11 is for acquiring the electric pressure converter 112
Heating voltage.By sampling feedback module 113, the heating voltage that device 112 is exported can be converted the voltage into and stablized at some
Fixed voltage value, the heating voltage for exporting electric pressure converter remain unchanged, so that the heating effect of thermal printing head is equal
It is even.After power supply starts power supply, control module 111 starts to acquire the supply voltage of the power supply, sampling feedback module
113 start the heating voltage of collection voltages converter.It is, of course, understood that control module 111 can also be from power supply
Place obtains its electric energy for carrying out issued transaction of driving.Control module 111 exports computer heating control according to its supply voltage collected
Signal is to adjustment module 114.Adjustment module 114 carries out adjusting appropriate after the thermal control signals for receiving control module 111,
By the heating voltage in sampling feedback module 113, and the heating voltage setting for converting the voltage into the output of device 112 in turn is fixed as separately
One voltage value appropriate.For example, in the present embodiment, after control circuit 11 is powered, control module 111 starts
Acquire the supply voltage of power supply.Before the printing, if detecting, supply voltage is higher (for example, 24V), control module
111, which issue heating voltages, controls signals to adjustment module 114, and heating voltage adjustment is fixed to higher voltage with this
It is worth (for example, 17V), guarantees printing effect.If detecting, supply voltage is lower (for example, 17.5V), and control module 111 issues
Heating voltage controls signal to adjustment module 114, and heating voltage adjustment is fixed to lower voltage value (example with this
Such as, 15V), guarantee printing effect.It should be noted that thermal control signals will be locked, and be kept with this in print procedure
Heating voltage will not change in print procedure, until printing terminates.
In conclusion the thermal printhead heats voltage control circuit of the present embodiment is by introducing adjustment module and control mould
Block, so that the heating voltage that power adapter is exported becomes the variable that can specifically adjust according to the actual situation.In external power supply
When the voltage supplied is sufficiently high, control module can instruct adjustment module to be adjusted, by the heating voltage of power adapter
It is fixed as high value, and then improves the printing effect of heating print head；And monitoring the reduction of voltage provided by external power supply
When to certain threshold value, control module again can be by instructing the adjustment module to be adjusted, by the heating voltage of power adapter
It is fixed as lower value, avoids causing heating concentration variation since heating voltage can not be stablized, and finally influence printing effect.
On the basis of first embodiment, as in Figure 3-5, in a preferred embodiment of the present invention, it will be understood that ginseng
It examines shown in Fig. 2 and Fig. 3, electric pressure converter 112 includes input terminal 1121, feedback end 1122 and output end 1123.In this implementation
In example, input terminal 1121 is connect with power supply, for receiving the power supply of power supply.Output end 1123 and thermal printing head connect
It connects, for exporting heating voltage to thermal printing head, to control the printing of thermal printing head.Feedback end 1122 is used for feedback voltage
Voltage in converter 112, it is corresponding with same heating voltage.In the case that total voltage in electric pressure converter 112 is constant, in
Feedback voltage measured by feedback end and the heating voltage measured by output end have shifting trend.More specifically,
In the present embodiment, the sampling feedback module 113 includes the first sampling resistor R1 and the second sampling resistor R2.Wherein, described
First sampling resistor R1 is connect with the feedback end 1122 of the electric pressure converter 112, for acquiring feedback voltage.Described second adopts
Sample resistance R2 is connect with the heating voltage output end of the electric pressure converter 112, for acquiring the heating voltage.Described first
Sampling resistor R1 is grounded after connecting with the second sampling resistor R2.The adjustment module 114 includes adjusting resistance R3 and switch
Element, described adjusting one end resistance R3 ground connection, the other end accessed by the switch element in the first sampling resistor R1 and
Between the second sampling resistor R2, and it is in parallel with the first sampling resistor R1.The control module 111 passes through control signal
The opening and closing of the switch element are controlled, and then control the connection for adjusting resistance R3 and the sampling feedback module.
When switch element is closed, and adjusts resistance R3 access between the first sampling resistor R1 and the second sampling resistor R2,
It is in parallel with the first sampling resistor R1 to adjust resistance R3, so that feedback voltage becomes smaller, and then makes heating voltage become larger, keeps control
The control signal of molding block 111 inputs, then switch element remains closed state, and heating voltage is fixed as larger electricity at this time
Pressure value (for example, 17V).Similarly, when switch element is opened, adjusting resistance R3 disconnection is in parallel with the first sampling resistor R1,
So that feedback voltage becomes larger, and then makes heating voltage become smaller, the control signal input of control module 111 is kept, then switch element
Holding is in an open state, and heating voltage is fixed as small voltage value (for example, 15V) at this time.
Further, in above preferred embodiment on the basis of, as shown in Figures 4 and 5, the switch element may include
First field-effect tube Q1.The first field-effect tube Q1 can be insulating gate type field effect tube, be also possible to technotron；
It can be P-channel field-effect transistor (PEFT) pipe, be also possible to N-channel field-effect tube.In the present embodiment, as shown in figure 4, with insulated-gate type P
For channel field-effect pipe, the grid of the first field-effect tube Q1 is connect with the control module 111, first field-effect
The drain electrode of pipe Q1 is connect with the adjusting resistance, and the source electrode and the first sampling resistor R1 of the first field-effect tube Q1 connects
It connects.
Further, in above preferred embodiment on the basis of, as shown in figure 5, the switch element further includes second
Field-effect tube Q2.The second field-effect tube Q2 can be insulating gate type field effect tube, be also possible to technotron；It can be with
It is P-channel field-effect transistor (PEFT) pipe, is also possible to N-channel field-effect tube.In the present embodiment, as shown in figure 4, with insulated-gate type P-channel
For field-effect tube, wherein the grid of the second field-effect tube Q2 is connect with the control module, second field-effect tube
The source electrode of Q2 is connect with the drain electrode of first field-effect tube, the drain electrode of the second field-effect tube Q2 and first sampling
Resistance connection.It is appreciated that the control module 111 determines that the control is believed by the supply voltage of power supply collected
Number low and high level state；The low and high level state of the heating voltage control signal is used to control the opening of the switch element
With closure.Further, pull-up electricity is in series in the control module 111 to the path of the first field-effect tube Q1 grid
R4 is hindered, and is parallel with a ground capacity C simultaneously.
On the basis of the above embodiments, the adjustment module 114 in the present invention can also include the adjustable resistance of resistance value.
That is, the resistance value for adjusting resistance R4 is adjustable.By adjusting the resistance value of resistance R4, the variation of feedback voltage can be influenced, and then certain
Adjust to degree the voltage value of heating voltage.
As shown in Figure 1, providing a kind of printing device 1 in the second embodiment of the present invention, which includes supplying
Power supply 13, thermal printing head 12 and the thermal printhead heats voltage control circuit 11 as described in above-mentioned first aspect.
Wherein, the input terminal of the control circuit 11 is connect with the power supply 13, the output end of the control circuit 11 with it is described
Thermal printing head 12 connects.In the present embodiment, the control circuit 11 detects the supply voltage of power supply 13, and according to this
Supply voltage, instruction control supply enable thermal printing head 12 to be compatible with different to the heating voltage of thermal printing head 12
Power supply operating condition, while guaranteeing the printing effect and effect of printing device.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of thermal printhead heats voltage control circuit, which is characterized in that including electric pressure converter, sampling feedback module,
Control module and adjustment module；The electric pressure converter is connect with the sampling feedback module, the sampling feedback module with
The adjustment module connection, the control module are also connect with the sampling feedback module and the adjustment module；
The electric pressure converter is for converting the supply voltage for carrying out self powered supply and exporting heating voltage；The sampling feedback mould
Block is for acquiring the heating voltage；The control module simultaneously is used to be controlled according to the supply voltage by the adjustment module
The heating voltage.
2. control circuit as described in claim 1, which is characterized in that the sampling feedback module include the first sampling resistor and
Second sampling resistor；Wherein, first sampling resistor is connect with the feedback end of the electric pressure converter, for acquiring feedback electricity
Pressure；Second sampling resistor is connect with the heating voltage output end of the electric pressure converter, for acquiring the heating voltage；
First sampling resistor is grounded after connecting with second sampling resistor；
The adjustment module includes adjusting resistance and switch element, and adjusting resistance one end ground connection, the other end is opened by described
Element access is closed between first sampling resistor and second sampling resistor, and in parallel with first sampling resistor；
The control module controls the opening and closing of the switch element by controlling signal, and then controls the adjusting resistance and institute
State the connection of sampling feedback module.
3. control circuit as claimed in claim 2, which is characterized in that the switch element includes the first field-effect tube, wherein
The grid of first field-effect tube is connect with the control module, the drain electrode of first field-effect tube and the adjusting resistance
Connection, the source electrode of first field-effect tube are connect with first sampling resistor.
4. control circuit as claimed in claim 3, which is characterized in that the switch element further includes the second field-effect tube,
Described in the grid of the second field-effect tube connect with the control module, the source electrode of second field-effect tube with described first
The drain electrode of effect pipe connects, and the drain electrode of second field-effect tube is connect with first sampling resistor.
5. control circuit as claimed in claim 2, which is characterized in that the control module determines institute by the feedback voltage
State the low and high level state of control signal；The low and high level state of the control signal is used to control the opening of the switch element
With closure.
6. control circuit as claimed in claim 2, which is characterized in that the adjusting resistance is the adjustable resistance of resistance value.
7. control circuit as claimed in claim 4, which is characterized in that the control module to first fet gate
Path on be in series with a pull-up resistor, and be parallel with a ground capacity simultaneously.
8. a kind of printing device, which is characterized in that including thermal printing head and such as heat of any of claims 1-7
Quick print head heating voltage control circuit；The output end of the control circuit is connect with the thermal printing head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811639295.1A CN109849526B (en) | 2018-12-29 | 2018-12-29 | Heating voltage control circuit of thermal printing head and printing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811639295.1A CN109849526B (en) | 2018-12-29 | 2018-12-29 | Heating voltage control circuit of thermal printing head and printing equipment |
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| Publication Number | Publication Date |
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| CN109849526A true CN109849526A (en) | 2019-06-07 |
| CN109849526B CN109849526B (en) | 2021-06-11 |
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| CN201811639295.1A Active CN109849526B (en) | 2018-12-29 | 2018-12-29 | Heating voltage control circuit of thermal printing head and printing equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111300996A (en) * | 2020-02-26 | 2020-06-19 | 江门市得实计算机外部设备有限公司 | Method, device and computer storage medium for overcoming uneven heating of printing head |
| CN111332027A (en) * | 2020-03-13 | 2020-06-26 | 厦门汉印电子技术有限公司 | Color printer and heating voltage control circuit and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111300996A (en) * | 2020-02-26 | 2020-06-19 | 江门市得实计算机外部设备有限公司 | Method, device and computer storage medium for overcoming uneven heating of printing head |
| CN111332027A (en) * | 2020-03-13 | 2020-06-26 | 厦门汉印电子技术有限公司 | Color printer and heating voltage control circuit and method thereof |
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| CN109849526B (en) | 2021-06-11 |
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Denomination of invention: Thermal printing head heating voltage control circuit and printing equipment Granted publication date: 20210611 Pledgee: China Everbright Bank Limited by Share Ltd. Xiamen branch Pledgor: Xiamen Hanyin Co.,Ltd. Registration number: Y2024980011770 |
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