CN111987775A - Power supply control circuit and thermal printer - Google Patents
Power supply control circuit and thermal printer Download PDFInfo
- Publication number
- CN111987775A CN111987775A CN202010901958.3A CN202010901958A CN111987775A CN 111987775 A CN111987775 A CN 111987775A CN 202010901958 A CN202010901958 A CN 202010901958A CN 111987775 A CN111987775 A CN 111987775A
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- Prior art keywords
- circuit
- power supply
- control circuit
- battery
- charging
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of circuits, in particular to a power supply control circuit and a thermal printer. The invention discloses a power supply control circuit and a thermal printer, wherein the power supply control circuit comprises a rechargeable battery, a control unit, a charging circuit and a charging input interface, an input power supply of the charging input interface charges the battery through the charging circuit, a control end of the charging circuit is connected with a control output end of the control unit, the thermal printer also comprises an on-off control circuit and a one-way conduction circuit, the battery supplies power to the control unit through the on-off control circuit, the input power supply of the charging input interface supplies power to the control unit through the one-way conduction circuit, and the on-off control circuit is controlled to be on or off by the input power supply of the charging input interface. The invention can ensure that the battery is charged with enough current under the condition of over-discharge of the battery, can quickly charge the battery to return to a normal state, and has simple circuit structure, easy realization and low cost.
Description
Technical Field
The invention belongs to the technical field of circuits, and particularly relates to a power supply control circuit and a thermal printer.
Background
The portable thermal printer is usually powered by a battery, and generally has a charging function of a USB adapter as a common electronic device in our lives. Limited by volume and portability, their battery capacity is often limited, and thus endurance is an important indicator for portable thermal printers. On the other hand, a thermal printer is a device which consumes a high amount of battery power, and when the battery is exhausted, it is necessary to reactivate the battery in as short a time as possible and charge the battery as soon as possible in consideration of the user experience.
The miniaturized portable thermal printer adopts a single lithium battery to supply power, the battery voltage is 3.0V-4.2V, and the charging voltage is USB 5V. The conventional power control scheme is shown in fig. 1, and includes four parts, namely a battery 1 ', a controller 2 ', a heating head 4 ' and a charging circuit 3 ', the battery 1 ' provides a system power supply for the controller 2 ', the battery 1 ' provides heating power for the heating head 4 ' through a controlled switch 5 ', an external USB input charges the battery 1 ' through the charging circuit 3 ', and the heating head 4 ', the charging circuit 3 ' and the controlled switch 5 ' are controlled by signals provided by the controller 2 '.
The printer comprises the following working states:
shutdown state: the controlled switch 5 ' is turned off, the charging circuit 3 ' does not work, the controller 2 ' supplies power but does not work, at the moment, the battery 1 ' is in a minimum current discharge state, and the electric quantity of the battery 1 ' is slowly reduced.
The USB charging state: the controlled switch 5 'is turned off, the controller 2' supplies power to start working so as to control the charging circuit 3 ', the charging circuit 3' works, at the moment, the battery 1 'is in a state of charging and discharging with small current, and the electric quantity of the battery 1' is gradually increased.
Printing state: the controlled switch 5 ' is closed, the controller 2 ' is powered on, and the battery 1 ' is in a large-current discharging state, so that the electric quantity of the battery 1 ' is rapidly reduced no matter whether the charging circuit 3 ' works or not.
Although the power supply control circuit can well realize the path switching of charging and discharging of the printer in different states and basically meet the power supply requirement of the portable printer, the power supply control circuit still has the following problems:
as described above, since the thermal printer is a device that consumes a high amount of battery power, there may be a case where the battery power is excessively consumed in continuous use, and in this case, the battery voltage is consumed to a low value. For a charging circuit of a single lithium battery, in order to prevent the charging circuit from being damaged due to short-circuit fault of a battery terminal, when the detected battery voltage is lower than a certain value, the charging current is generally reduced to enter a PRE-charging (PRE-CHARGE) state, and the charging current is reduced to be not more than about 10% of a normal value at the maximum.
Taking a currently commonly used single lithium battery charging control chip SG6212 as an example, when the battery voltage is within a normal range, the highest charging current can be set to 1.2A. When the battery voltage is detected to be lower than 2.9V, the charging current is limited to be between 8mA and 120mA (the specific value depends on the peripheral circuit parameters of the chip). In this state, the controller system power supply still needs to be turned on to control the charging circuit, i.e. the system power supply will draw the supply current from the battery terminal. The system power supply consumption current of the portable thermal printer is generally about 50mA, so that the current actually charged into the battery is a very small value or a negative value, namely the current charged into the battery is lower than the discharge current of the battery, and the battery power is actually continuously consumed.
This situation may cause the printer to be charged for a long time after the battery is exhausted, and the battery cannot be recharged to a normal value, even if the battery cannot be recharged permanently.
Disclosure of Invention
The present invention is directed to a power control circuit and a thermal printer to solve the above problems.
In order to achieve the purpose, the invention adopts the technical scheme that: a power supply control circuit comprises a rechargeable battery, a control unit, a charging circuit and a charging input interface, wherein an input power supply of the charging input interface charges the battery through the charging circuit, a control end of the charging circuit is connected with a control output end of the control unit, the power supply control circuit also comprises an on-off control circuit and a one-way conduction circuit, the battery supplies power to the control unit through the on-off control circuit, the input power supply of the charging input interface supplies power to the control unit through the one-way conduction circuit, and the on-off control circuit is controlled to be on and off by the input power supply of the charging input interface.
Further, the rechargeable battery is a lithium battery.
Furthermore, the on-off control circuit is realized by adopting a switch tube.
Furthermore, the on-off control circuit is realized by adopting a PMOS tube.
Further, the on-off control circuit is realized by adopting a diode.
Further, the unidirectional conducting circuit is realized by adopting a diode.
The input end of the power supply circuit is connected with the output end of the battery and the input power supply of the charging input interface through the on-off control circuit and the one-way conducting circuit respectively, and the output end of the power supply circuit is connected with the power supply input end of the control unit.
Further, the charging input interface is a USB interface.
The invention also provides a thermal printer which is provided with the power supply control circuit.
The invention has the beneficial technical effects that:
the invention can ensure that the battery is charged with enough current under the condition of over-discharge of the battery, can quickly charge the battery to return to a normal state, and has simple circuit structure, easy realization and low cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of a conventional power control circuit for a portable thermal printer;
fig. 2 is a block diagram of a power control circuit according to a first embodiment of the invention;
FIG. 3 is a partial circuit diagram of a first embodiment of the present invention;
FIG. 4 is a partial circuit diagram of a second embodiment of the present invention;
fig. 5 is a block diagram of a power control circuit according to a fourth embodiment of the present invention;
fig. 6 is a block diagram of a power supply control circuit of a thermal printer according to a fifth embodiment of the present invention.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
Example one
As shown in fig. 2, the present embodiment provides a power control circuit, which includes a rechargeable battery 1, a control unit 2, a charging circuit 3, a charging input interface, an on-off control circuit 5, a unidirectional conducting circuit 6 and a power circuit 7, wherein an input power of the charging input interface charges the battery 1 through the charging circuit 3, a control end of the charging circuit 3 is connected to a control output end of the control unit 2, an output end of the battery 1 is connected to an input end of the power circuit 7 through the on-off control circuit 5, an input power of the charging input interface is connected to an input end of the power circuit 7 through the unidirectional conducting circuit 6, an output end of the power circuit 7 is connected to a power input end of the control unit 2 to supply power to the control unit 2, the on-off control circuit 5 is controlled to be on and off by the input power of the charging input interface, when no input power is supplied to the, the battery 1 supplies power to the control unit 2 through the on-off control circuit 5 and the power circuit 7; when the charging input interface has an input power supply, namely in a charging state, the on-off control circuit 5 is switched off, the input power supply of the charging input interface supplies power to the control unit 2 through the one-way conduction circuit 6 and the power circuit 7, the control unit 2 works normally to control the charging circuit 3 to work, and the input power supply of the charging input interface charges the battery through the charging circuit 3.
It can be seen that, in this embodiment, in the charging state, the battery 1 has only the charging current and no discharging current, even in the state of excessive consumption of the battery 1, the charging circuit 3 reduces the charging current to about 10% of the normal value, and since the on-off control circuit 5 is in the off state at this time, there is no current drawn from the battery 1 end by the system power supply, so that the battery 1 can still be charged and restored to the normal working state quickly, and the circuit structure is simple, easy to implement and low in cost.
In this embodiment, the rechargeable battery 1 is a lithium battery, but the invention is not limited thereto, and in other embodiments, other rechargeable batteries may be used as long as the above technical problems are met.
In this embodiment, the charging input interface is the USB interface 4, but is not limited thereto, and in other embodiments, other interfaces may be used as long as power input can be performed.
As shown in fig. 3, in this embodiment, the on-off control circuit 5 is preferably implemented by an enhanced PMOS transistor Q1, which has low power consumption, easy control and good effect, but not limited thereto, in some embodiments, the on-off control circuit 5 may also be implemented by other switching transistors, which can be easily implemented by those skilled in the art, and will not be described in detail.
Specifically, the drain of the PMOS transistor Q1 is connected to the output terminal BAT of the battery 1, the source of the PMOS transistor Q1 is connected to the input terminal of the power circuit 7, the gate series resistor R1 of the PMOS transistor Q1 is grounded, and the gate of the PMOS transistor Q1 is connected to the input power VBUS of the USB interface 4.
In this embodiment, the unidirectional conducting circuit 6 is preferably implemented by using a diode D1, and has a simple structure and low cost, but not limited thereto.
The anode of the diode D1 is connected to the input power VBUS of the USB interface 4, and the cathode of the diode D1 is connected to the input end of the power circuit 7.
In this embodiment, the power circuit 7 is implemented by using a regulated power supply chip U1, and the model is SGM2019-3.3YN5G, but not limited thereto, and in other embodiments, the power circuit 7 may also be implemented by using other existing power circuits, which can be easily implemented by those skilled in the art and will not be described in detail.
Specifically, an input end IN of the regulated power supply chip U1 is connected to a cathode of the diode D1 and a source of the PMOS transistor Q1, an enable end EN of the regulated power supply chip U1 is connected to the input power VBUS of the USB interface 4 and the control output end EN-3V3 of the control unit 2 IN an anti-series connection manner through the diode D2 and the diode D3, respectively, and an output end OUT of the regulated power supply chip U1 is connected to a power input end of the control unit 2 to supply power to the control unit 2.
The control unit 2 can be implemented by using an existing control unit, such as an MCU processor, which is a well-established prior art and can be easily implemented by those skilled in the art without being elaborated.
The charging circuit 3 is implemented by using an existing charging circuit of a lithium battery, for example, by using a charging control chip of a lithium battery with model number SG6212, which is a well-established and commonly-used prior art, and can be easily implemented by those skilled in the art, and will not be described in detail.
When the USB interface 4 has the input power VBUS (when charging is carried out), one path of the input power VBUS supplies power to the voltage stabilization power chip U1 through the diode D1, meanwhile, the input power VBUS enables the enabling end of the voltage stabilization power chip U1 to be at a high level through the diode D2, the voltage stabilization power chip U1 works, 3.3V is output to supply power to the control unit 2, the grid of the PMOS tube Q1 is at the high level, the PMOS tube Q1 is disconnected, the battery 1 does not supply power to the voltage stabilization power chip U1, and the battery 1 does not output current; when the USB interface 4 does not have the input power VBUS, the gate of the PMOS transistor Q1 is at a low level, the PMOS transistor Q1 is turned on, the battery 1 supplies power to the regulated power supply chip U1, and the regulated power supply chip U1 operates to output 3.3V to supply power to the control unit 2.
Example two
As shown in fig. 4, the differences between the first embodiment and the second embodiment are: the on-off control circuit 5 of this embodiment is implemented by using a diode D4, wherein the anode of the diode D4 is connected to the output terminal BAT of the battery 1, and the cathode of the diode D4 is connected to the input terminal IN of the regulated power supply chip U1.
When the USB interface 4 has the input power VBUS (for charging), one path of the input power VBUS supplies power to the regulated power supply chip U1 through the diode D1, and at this time, the cathode potential of the diode D4 is greater than the anode potential, and the battery 1 no longer supplies power to the regulated power supply chip U1, and is in a disconnected state, and there is no output current.
The on-off control circuit 5 is realized by adopting the diode D4, the on-off of the on-off control circuit is controlled without an input power supply of the USB interface 4, the circuit structure is simple, the implementation is easy, and the cost is low, but the diode has higher conduction voltage drop and will cause extra loss, and in addition, when the voltage of the battery is lower, the system power supply provided by the battery through the diode voltage drop is lower, and the power supply requirement of the controller may not be met.
EXAMPLE III
The difference between this embodiment and the first embodiment is: the unidirectional circuit 6 of the present embodiment is implemented by using switching tubes such as PNP triodes, and the specific circuit connection can be easily implemented by those skilled in the art, and will not be described in detail.
Example four
As shown in fig. 5, the difference between the present embodiment and the first embodiment is: in this embodiment, there is no power supply circuit, the battery 1 directly supplies power to the control unit 2 through the on-off control circuit 5, and the input power of the USB interface 4 directly supplies power to the control unit 2 through the unidirectional conducting circuit 6.
EXAMPLE five
As shown in fig. 6, the present invention also provides a thermal printer provided with the power control circuit. In addition, the heating head 8 and the controlled switch 9 are further included, control ends of the heating head 8 and the controlled switch 9 are respectively connected with a control output end of the control unit 2, an output end of the battery 1 supplies power to the heating head 8 through the controlled switch 9, and specific circuit structures of the heating head 8 and the controlled switch 9 can refer to the heating head and the controlled switch of the existing thermal printer, which is not described in detail.
The invention can ensure that the battery is charged with enough current under the condition of over-discharge of the battery, can quickly charge the battery to return to a normal state, and has simple circuit structure, easy realization and low cost.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A power supply control circuit comprises a rechargeable battery, a control unit, a charging circuit and a charging input interface, wherein an input power supply of the charging input interface charges the battery through the charging circuit, and a control end of the charging circuit is connected with a control output end of the control unit, and the power supply control circuit is characterized in that: the charging system further comprises an on-off control circuit and a one-way conduction circuit, the battery supplies power to the control unit through the on-off control circuit, the input power supply of the charging input interface supplies power to the control unit through the one-way conduction circuit, and the on-off control circuit is controlled to be on or off by the input power supply of the charging input interface.
2. The power control circuit of claim 1, wherein: the rechargeable battery is a lithium battery.
3. The power supply control circuit according to claim 1 or 2, characterized in that: the on-off control circuit is realized by adopting a switch tube.
4. The power control circuit of claim 3, wherein: the on-off control circuit is realized by adopting a PMOS tube.
5. The power supply control circuit according to claim 1 or 2, characterized in that: the on-off control circuit is realized by adopting a diode.
6. The power supply control circuit according to claim 1 or 2, characterized in that: the unidirectional conduction circuit is realized by adopting a diode.
7. The power supply control circuit according to claim 1 or 2, characterized in that: the input end of the power circuit is connected with the output end of the battery and the input power supply of the charging input interface through the on-off control circuit and the one-way conducting circuit respectively, and the output end of the power circuit is connected with the power input end of the control unit.
8. The power supply control circuit according to claim 1 or 2, characterized in that: the charging input interface is a USB interface.
9. A thermal printer, characterized by: a power control circuit as claimed in any one of claims 1 to 8 is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901958.3A CN111987775A (en) | 2020-09-01 | 2020-09-01 | Power supply control circuit and thermal printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901958.3A CN111987775A (en) | 2020-09-01 | 2020-09-01 | Power supply control circuit and thermal printer |
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| Publication Number | Publication Date |
|---|---|
| CN111987775A true CN111987775A (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010901958.3A Pending CN111987775A (en) | 2020-09-01 | 2020-09-01 | Power supply control circuit and thermal printer |
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| CN (1) | CN111987775A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112714544A (en) * | 2020-12-31 | 2021-04-27 | 厦门汉印电子技术有限公司 | Circuit board structure of electronic equipment and printer |
| CN114261216A (en) * | 2021-12-31 | 2022-04-01 | 深圳市普贴科技有限公司 | Control circuit of handheld printer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110126475A (en) * | 2019-06-17 | 2019-08-16 | 珠海趣印科技有限公司 | A kind of high-precision thermal printer |
| CN209516686U (en) * | 2019-03-15 | 2019-10-18 | 湖南中烟工业有限责任公司 | A microprocessor work control circuit |
| CN210490513U (en) * | 2019-10-22 | 2020-05-08 | 江苏邦融微电子有限公司 | Dual-power supply circuit |
| CN210577871U (en) * | 2019-09-29 | 2020-05-19 | 歌尔科技有限公司 | Power supply power path management circuit and intelligent wearable device |
| CN212366898U (en) * | 2020-09-01 | 2021-01-15 | 厦门汉印电子技术有限公司 | Power supply control circuit and thermal printer |
-
2020
- 2020-09-01 CN CN202010901958.3A patent/CN111987775A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209516686U (en) * | 2019-03-15 | 2019-10-18 | 湖南中烟工业有限责任公司 | A microprocessor work control circuit |
| CN110126475A (en) * | 2019-06-17 | 2019-08-16 | 珠海趣印科技有限公司 | A kind of high-precision thermal printer |
| CN210577871U (en) * | 2019-09-29 | 2020-05-19 | 歌尔科技有限公司 | Power supply power path management circuit and intelligent wearable device |
| CN210490513U (en) * | 2019-10-22 | 2020-05-08 | 江苏邦融微电子有限公司 | Dual-power supply circuit |
| CN212366898U (en) * | 2020-09-01 | 2021-01-15 | 厦门汉印电子技术有限公司 | Power supply control circuit and thermal printer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112714544A (en) * | 2020-12-31 | 2021-04-27 | 厦门汉印电子技术有限公司 | Circuit board structure of electronic equipment and printer |
| CN114261216A (en) * | 2021-12-31 | 2022-04-01 | 深圳市普贴科技有限公司 | Control circuit of handheld printer |
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Country or region after: China Address after: 361000 305A room, Aung Yip house, Pioneer Park, torch high tech Zone, Xiamen, Fujian Applicant after: Xiamen Hanyin Co.,Ltd. Address before: 361000 305A room, Aung Yip house, Pioneer Park, torch high tech Zone, Xiamen, Fujian Applicant before: XIAMEN HANIN ELECTRONIC TECHNOLOGY Co.,Ltd. Country or region before: China |