CN113013939B - Wireless charging method and circuit of touch pen - Google Patents
Wireless charging method and circuit of touch pen Download PDFInfo
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- CN113013939B CN113013939B CN202110185192.8A CN202110185192A CN113013939B CN 113013939 B CN113013939 B CN 113013939B CN 202110185192 A CN202110185192 A CN 202110185192A CN 113013939 B CN113013939 B CN 113013939B
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- 238000007600 charging Methods 0.000 title claims abstract description 163
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 57
- 241001422033 Thestylus Species 0.000 claims description 85
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 17
- 238000001914 filtration Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- KLDZYURQCUYZBL-UHFFFAOYSA-N 2-[3-[(2-hydroxyphenyl)methylideneamino]propyliminomethyl]phenol Chemical compound OC1=CC=CC=C1C=NCCCN=CC1=CC=CC=C1O KLDZYURQCUYZBL-UHFFFAOYSA-N 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 201000001098 delayed sleep phase syndrome Diseases 0.000 description 1
- 208000033921 delayed sleep phase type circadian rhythm sleep disease Diseases 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
-
- 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the application provides a wireless charging method and a circuit of a touch pen, wherein the method comprises the following steps: the detection circuit of the flat plate receives a first power signal; the first power signal is a power signal generated by a second power signal transmitted by a power transmitting circuit of the touch pen of the tablet; the detection circuit responds to the first power signal to generate a starting signal of the panel so that the panel is started; and under the condition that the tablet is in a starting state, the controller of the tablet controls the wireless charging module of the tablet to charge the touch pen.
Description
Technical Field
The application relates to a wireless charging technology, in particular to a wireless charging method and a wireless charging circuit of a touch pen.
Background
In the related art, the wireless charging scheme of the stylus is that when the tablet computer is powered off, the tablet computer cannot charge the stylus, and at the moment, if the stylus is not powered on, the stylus needs to be charged wirelessly to be used when the stylus is used again, so that the user experience is poor.
Disclosure of Invention
The embodiment of the application provides a wireless charging method and a wireless charging circuit for a touch pen.
In a first aspect, an embodiment of the present application provides a wireless charging method for a stylus, where the method includes: the detection circuit of the flat plate receives a first power signal; the first power signal is a power signal generated by a second power signal transmitted by a power transmitting circuit of the touch pen of the tablet; the detection circuit responds to the first power signal to generate a starting signal of the panel so that the panel is started; and under the condition that the tablet is in a starting state, the controller of the tablet controls the wireless charging module of the tablet to charge the touch pen.
In a second aspect, an embodiment of the present application provides another method for wireless charging of a stylus, where the method includes: the controller of the touch control pen obtains a battery voltage value of the touch control pen; when the battery voltage value is lower than a first voltage threshold value, the controller of the touch pen controls the power transmitting circuit of the touch pen to transmit a second power signal, so that the detection circuit of the flat panel receives a first power signal generated based on the second power signal; and the controller of the touch control pen controls the wireless charging module receiving the tablet to charge the touch control pen.
In a third aspect, an embodiment of the present application provides a wireless charging circuit of a stylus, where the circuit includes:
a detection circuit for receiving the first power signal; generating a start-up signal of the panel in response to the first power signal, so that the panel is started up; the first power signal is a power signal generated by a second power signal transmitted by a power transmitting circuit of the touch pen of the tablet;
and the tablet control circuit is used for controlling the wireless charging module of the tablet to charge the touch pen under the condition that the tablet is in a starting state.
In a fourth aspect, a disclosed embodiment of the application provides a wireless charging circuit for another stylus, the circuit comprising: the touch control pen control circuit is used for acquiring a battery voltage value of the touch control pen; controlling a power transmitting circuit of the stylus to transmit a second power signal under the condition that the battery voltage value is lower than a first voltage threshold value, so that a detection circuit of the flat panel receives a first power signal generated based on the second power signal; and controlling the wireless charging module receiving the tablet to charge the touch pen.
In the embodiment of the application, under the condition that the panel is powered off, the power signal generated by the second power signal sent by the power sending circuit of the touch pen of the panel can be received and responded through the detection circuit of the panel, so that the panel is powered on, and the touch pen is charged through the wireless charging module of the panel. Therefore, under the condition that the tablet computer is shut down, the touch pen can be charged, so that the tablet computer can be directly used when the touch pen is reused, and the user experience is good.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
FIG. 1A is a schematic diagram of a structure of a related art stylus;
FIG. 1B is a schematic diagram of the positions of a stylus and a tablet in the related art;
fig. 2 is a schematic implementation flow chart of a wireless charging method of a stylus according to an embodiment of the present application;
fig. 3 is a schematic implementation flow chart of another wireless charging method of a stylus according to an embodiment of the present application;
fig. 4 is a schematic implementation flow chart of a wireless charging method of a stylus according to another embodiment of the present application;
fig. 5 is a schematic implementation flow chart of a wireless charging method of a stylus according to an embodiment of the present application;
FIG. 6A is a schematic diagram of a tablet personal computer wirelessly charging a stylus in a tablet personal computer on-state according to an embodiment of the present application;
FIG. 6B is a schematic diagram of a wireless charging coil L1 connected to a detection circuit before a panel is turned off according to an embodiment of the present application;
FIG. 6C is a schematic diagram of a stylus with a battery voltage below a voltage threshold in a tablet-off state according to an embodiment of the present application;
FIG. 6D is a schematic diagram illustrating a charging of a stylus by a tablet computer in a tablet computer power-off state according to an embodiment of the present application;
fig. 7 is a schematic flow chart of a wireless charging control method for a stylus according to an embodiment of the application;
fig. 8 is a schematic diagram of a composition structure of a stylus and a detection circuit according to an embodiment of the present application;
fig. 9 is a schematic diagram of a wireless charging circuit of a stylus according to an embodiment of the present application;
fig. 10 is a schematic diagram of a wireless charging circuit of another stylus according to an embodiment of the application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples. It is to be understood that the examples provided herein are for the purpose of illustration only and are not intended to limit the application. In addition, the embodiments provided below are some of the embodiments for carrying out the present application, but not all of the embodiments for carrying out the present application, and the technical solutions described in the embodiments of the present application may be implemented in any combination without conflict.
It should be noted that, in the embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a method or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such method or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other related elements in a method or apparatus comprising the element (e.g., a step in a method or an element in an apparatus, e.g., an element may be part of a circuit, part of a processor, part of a program or software, etc.).
The term "and/or" is herein merely one association relationship describing an associated object, meaning that there may be three relationships, e.g., U and/or W, may represent: there are three cases where U alone exists, U and W together, and W alone exists. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of U, W, V, and may mean including any one or more elements selected from the group consisting of U, W and V.
In the related art, the stylus is a capacitive stylus, and the capacitive stylus may include a passive capacitive stylus and an active capacitive stylus, where the active capacitive stylus may be referred to as an active stylus, and has a circuit therein, and the touch screen receives a signal emitted by the capacitive stylus, so as to learn coordinates of the capacitive stylus on a screen.
In the embodiment of the application, the touch pen can be an active pen.
Fig. 1A is a schematic diagram of the composition of a related art stylus, and as shown in fig. 1A, the capacitive stylus 100 includes a charging coil 101 and other components 102.
Fig. 1B is a schematic diagram of the positions of a stylus and a tablet in the related art, and as shown in fig. 1B, a capacitive stylus 103 is adsorbed at a fixed position on the upper side of a tablet 104.
In the existing wireless charging scheme of the touch pen, the touch pen and the tablet are adsorbed together, the touch pen is charged wirelessly through the tablet, but when the tablet is powered off, the tablet cannot charge the touch pen, and at the moment, if the touch pen has no electricity and the touch pen cannot inform a host, the touch pen can be used only by needing to be charged wirelessly for 15 to 20 minutes when the touch pen is used again, and the customer experience of a user is very poor.
In view of the above-mentioned problems and the drawbacks of the existing solutions, embodiments of the present application provide:
1) Through flow control, when the battery voltage of the touch pen is lower than a certain threshold value, the state of a charging module of the wireless charging touch pen is changed from a receiving RX mode to a transmitting TX mode, and a power signal is sent to a host.
2) The flat board is awakened by the flat board end through the added power signal detection circuit, and the touch pen is charged through the wireless charging module after the flat board is awakened.
Through the flow, the touch pen can actively request the flat plate to charge according to the low-power condition of the touch pen, so that the problem that the touch pen cannot be charged due to low power in the state that the flat plate is powered off is solved, and the user experience is improved.
Fig. 2 is a schematic diagram of an implementation flow of a wireless charging method of a stylus according to an embodiment of the present application, as shown in fig. 2, where the flow includes:
step S201: a controller of a touch pen acquires a battery voltage value of the touch pen;
it is understood that the stylus includes a battery to implement the signal triggering function.
In one example, the controller of the stylus acquires the battery voltage value of the stylus, and the battery voltage detection circuit of the stylus detects a voltage signal of a storage battery of the stylus and sends the voltage signal to the controller of the stylus, and the controller of the stylus obtains the battery voltage value of the stylus.
Step S202: under the condition that the battery voltage value is lower than a first voltage threshold value, a controller of the touch control pen controls a power transmitting circuit of the touch control pen to transmit a second power signal;
it is understood that the first voltage threshold may be a voltage threshold that ensures that the stylus may be used normally, and the first voltage threshold may be any voltage value that is 30% or more than 30% of the rated voltage value of the battery. The power transmitting circuit of the stylus may be a power management circuit of the stylus.
Step S203: a detection circuit of the panel receives a first power signal generated based on the second power signal;
here, the first power signal is a power signal generated by a second power signal transmitted by a power transmission circuit of the stylus of the tablet;
it will be appreciated that the panel is in a shutdown state before the detection circuit of the panel receives the first power signal, and all of the constituent modules and components in the panel are in a non-operational state. The first power signal may be a voltage signal of a preset magnitude, and correspondingly, the voltage value of the first power signal may be in a fixed linear relationship with the voltage value of the second power signal, and in one example, the voltage value of the first power signal may be equal to the voltage value of the second power signal.
Here, the amplitude and voltage of the second power signal transmitted by the power transmission circuit of the stylus pen are not particularly limited, and the second power signal may be a sinusoidal alternating current with a frequency of 100kHz to 250kHz,3.5v to 5v,250ms or more.
It can be understood that the flat panel detector circuit is a circuit designed for triggering the flat panel power-on in the flat panel power-off state and used for generating the flat panel power-on signal when receiving the power signal according to the embodiment of the application.
In one possible implementation, the detection circuit of the tablet receives the first power signal, which may be a second power signal sent by the power sending circuit of the stylus of the tablet, generates the first power signal on a specific coil connected to the detection circuit in the tablet, and transmits the first power signal as an input to the detection circuit of the tablet, which receives the first power signal transmitted from the coil on the tablet.
Here, the specific coil may be a coil in the tablet that energy interacts with the stylus of the tablet.
Step S204: the detection circuit responds to the first power signal to generate a starting signal of the panel so that the panel is started;
it is understood that the power-on signal of the panel may be a preset voltage signal with a fixed amplitude.
In one possible implementation manner, the detection circuit generates the panel start-up signal in response to the first power signal, so that the panel start-up signal may be obtained by rectifying, filtering and amplifying the first power signal by the detection circuit to obtain a voltage signal with a fixed amplitude, and triggering the panel start-up by the voltage signal with the fixed amplitude.
Here, the panel start-up is triggered by the voltage signal with the fixed amplitude, which may be that the voltage signal with the fixed amplitude is input into the start-up switch of the panel, so that the start-up switch of the panel is closed, and the panel is started up.
Step S205: and under the condition that the tablet is in a starting state, the controller of the tablet controls the wireless charging module of the tablet to charge the touch pen.
It is understood that the controller of the tablet may be at least one of an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a digital signal processor (Digital Signal Processor, DSP), a digital signal processing device (Digital Signal Processing Device, DSPD), a programmable logic device (Programmable Logic Device, PLD), a field programmable gate array (Field Programmable Gate Array, FPGA), a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, a microprocessor. Here, the specific limitation is not given.
In a possible implementation manner, when the tablet is in a power-on state, the controller of the tablet controls the wireless charging module of the tablet to charge the stylus, and may be that when the tablet is in a power-on state, the controller of the tablet controls the wireless charging control module to be connected with a specific coil in the tablet, and the stylus is charged through the specific coil.
Step S206: and the controller of the touch control pen controls the wireless charging module receiving the tablet to charge the touch control pen.
In the embodiment of the application, when the flat panel is in a shutdown state and the battery voltage value of the touch pen is lower than the first voltage threshold value, the controller of the touch pen controls the power transmission circuit of the touch pen to transmit the second power signal, and the detection circuit of the flat panel receives and responds to the power signal generated by the second power signal transmitted by the power transmission circuit of the touch pen of the flat panel, so that the flat panel is started, and the touch pen is charged by the wireless charging module of the flat panel. Therefore, under the condition that the tablet computer is shut down, the touch pen can be charged, so that the tablet computer can be directly used when the touch pen is reused, and the user experience is good.
Fig. 3 is a schematic flow chart of an implementation of another wireless charging method of a stylus according to an embodiment of the present application, as shown in fig. 3, where the flow chart includes:
step S301: a controller of a touch pen acquires a battery voltage value of the touch pen; the stylus pen comprises a second coil forming a transformer with the first coil of the tablet pen;
step S302: when the battery voltage value is lower than a first voltage threshold value, the controller of the stylus controls a power transmission circuit of the stylus to transmit the second power signal to the second coil;
step S303: the first coil senses the second power signal on the second coil to generate the first power signal under the condition that the stylus is positioned at the specific position;
it will be appreciated that the stylus can be charged by the tablet wireless charging module only at specific locations, i.e. locations in the tablet where energy interaction with the tablet's stylus occurs. Here, the first coil may be a specific coil.
In some possible embodiments, the first coil senses the second power signal on the second coil of the stylus to generate the first power signal if the stylus is located at the specific position, and may be the second power signal generated on the second coil of the stylus, and the first coil on the panel and the second coil form a transformer senses the second power signal on the second coil of the stylus to generate the first power signal. The relation between the voltage value of the first power signal and the voltage value of the second power signal can be determined according to the turn ratio of the first coil and the second coil.
Step S304: the first coil transmits the first power signal to the detection circuit;
it will be appreciated that since the first coil of the panel is connected to the detector circuit of the panel when the panel is in the off condition, the power signal received by the first coil corresponds to the power input of the detector circuit of the panel.
Step S305: the detection circuit responds to the first power signal to generate a starting signal of the panel so that the panel is started;
step S306: when the flat plate is in a starting state and the touch pen is positioned at a specific position of the flat plate, the controller of the flat plate controls the first coil to be connected with the wireless charging module of the flat plate; the specific position represents a position where the first coil is disposed;
here, the wireless charging module of the tablet may be a power management module, and in particular, the wireless charging module of the tablet may be a power management circuit composed of a power management chip and a peripheral circuit.
It can be appreciated that, in order to charge the tablet stylus through the tablet wireless charging module, when the tablet is in a turned-on state and the stylus is located at a specific position, the first coil needs to be controlled by the tablet controller to be connected with the tablet wireless charging module, so that charging power from the tablet wireless charging module is transferred to the tablet stylus through the first coil.
Here, the implementation manner of controlling the connection between the first coil and the wireless charging module of the flat panel by the controller of the flat panel may be that the controller of the flat panel controls the double-pole double-throw switch, so that the first coil at one end of the double-pole double-throw switch is connected with the wireless charging module of the flat panel.
Step S307: the controller of the tablet controls the wireless charging module to send a charging power signal to the first coil, so that the second coil senses the corresponding charging power signal to realize charging of the stylus;
it is understood that the charging power signal may be a charging power signal with a specific voltage value and a specific current value, and of course, the charging power signal may also be a power signal with a voltage value and a current value that are changed, and the charging power signal needs to be determined according to an output mode of the wireless charging module, for example, the output mode of the wireless charging module may be a constant-current constant-voltage charging mode, a trickle charging mode, a high-current charging mode or a constant-voltage charging mode.
In one example, when a charging power signal is sent to a first coil, a second coil forming a transformer with the first coil senses a corresponding charging power signal when the charging power signal is present on the first coil. Here, the corresponding charging power signal is related to the turns ratio of the first coil and the second coil.
Step S308: and the controller of the touch control pen controls the wireless charging module receiving the tablet to charge the touch control pen.
In the embodiment of the application, when the battery voltage value of the touch pen is lower than the first voltage threshold value, the controller of the touch pen controls the power transmission circuit of the touch pen to transmit the second power signal to the second coil, and the detection circuit is connected with the first coil because the first coil and the second coil form a transformer, so that the second power signal on the touch pen can be accurately transmitted to the detection circuit, and the detection circuit generates a panel start-up signal to start up the panel. The first coil is controlled by the controller of the flat plate to be connected with the wireless charging module of the flat plate, so that a charging power signal is transmitted to the first coil through the wireless charging module of the flat plate, and then is transmitted to the second coil in the touch pen forming a transformer with the first coil, the charging of the touch pen is realized, the voltage value of the battery of the touch pen can be ensured to be always greater than or equal to a first voltage threshold value, the touch pen can be used at any time, and the user experience is good.
Fig. 4 is a schematic implementation flow chart of a wireless charging method of a stylus according to another embodiment of the present application, as shown in fig. 4, where the flow chart includes:
step S401: responding to the received shutdown signal, and controlling the first coil of the flat plate to be connected with a detection circuit of the flat plate by a controller of the flat plate;
in one possible implementation manner, in response to the received shutdown signal, the controller of the flat panel controls the first coil of the flat panel to be connected with the detection circuit of the flat panel, which may be that a user manually triggers a shutdown button, the controller of the flat panel receives a shutdown signal corresponding to shutdown operation, and in response to the shutdown signal, controls the double-pole double-throw switch so that the double-pole double-throw switch is connected to the detection circuit of the flat panel, and further, the first coil at one end of the double-pole double-throw switch is connected with the detection circuit of the flat panel.
Step S402: the detection circuit receives a first power signal; the first power signal is a power signal generated by a second power signal transmitted by a power transmitting circuit of the touch pen of the tablet;
step S403: the detection circuit responds to the first power signal to generate a starting signal of the panel so that the panel is started;
step S404: under the condition that the tablet is in a starting state, a controller of the tablet controls a wireless charging module of the tablet to charge the touch pen;
step S405: the controller of the tablet determines the charging time length of the wireless charging module of the tablet for charging the stylus;
in a possible implementation manner, the controller of the tablet determines a charging duration of the wireless charging module of the tablet for charging the stylus, and may record a starting time of charging the stylus through the wireless charging module of the tablet, and then acquire a current time in real time to determine a charging duration corresponding to the current time.
Step S406: under the condition that the charging time length reaches a charging time length threshold value, the controller of the flat panel controls to disconnect the first coil from the wireless charging module of the flat panel, so that the flat panel stops charging the touch pen;
it is understood that the charging duration threshold is determined according to the performance parameter of the storage battery in the stylus of the tablet and the working mode, the power level and the like of the wireless charging module in the tablet. In general, the stylus pen can be charged to enough electric quantity within the charging time threshold, and the safety of the storage battery in the flat plate can be ensured without overcharge and other conditions.
Step S407: after the tablet stops charging the stylus, the controller of the tablet determines whether a touch operation to the tablet is received within a specific time period;
the specific time period may be a preset period of time, for example, may be 5 minutes.
Step S408: and under the condition that touch operation is not received, the controller of the flat panel controls and triggers a shutdown signal of the flat panel, so that the flat panel is shut down.
In the embodiment of the application, the flat panel controller controls the connection of the first coil of the flat panel and the detection circuit of the flat panel through responding to the received shutdown signal, so that the flat panel can be started through the detection circuit under the condition that the trigger power signal exists on the first coil after the flat panel is shut down. The charging time of the flat panel is monitored to timely control the disconnection of the flat panel to charge the touch pen, so that the safety of a storage battery in the touch pen is ensured. By judging whether the touch operation on the flat panel is received within the specific time period, whether the flat panel is needed to be used by a user is determined, and when the touch operation on the flat panel is not received within the specific time period, the flat panel is powered off, so that the resource waste caused by the fact that the flat panel is in a power-on state when the flat panel is not used by the user can be avoided.
Fig. 5 is a schematic implementation flow chart of a wireless charging method of a stylus according to an embodiment of the present application, as shown in fig. 5, where the flow chart includes:
step S501: a controller of a touch pen acquires a battery voltage value of the touch pen;
step S502: under the condition that the battery voltage value is lower than a first voltage threshold value, the controller of the touch pen controls the power transmitting circuit of the touch pen to transmit a second power signal, so that the detection circuit of the flat panel receives the first power signal;
step S503: the controller of the touch control pen controls the wireless charging module receiving the flat plate to charge the touch control pen;
step S504: and under the condition that the voltage value of the battery is higher than a second voltage threshold value, the controller of the touch control pen controls to disconnect a second coil loop of the touch control pen, so that the flat plate stops charging the touch control pen.
It will be appreciated that the second voltage threshold may be 90% of the nominal voltage of the battery, and is not specifically limited herein.
In one example, as the tablet charges the stylus, the voltage value of the battery in the stylus gradually increases, and when the voltage value of the battery is higher than the second voltage threshold, the controller of the stylus controls to disconnect the second coil loop, so that the tablet stops charging the stylus.
In the embodiment of the application, the voltage value of the battery is monitored, and the controller of the touch pen controls the second coil loop of the touch pen to be disconnected under the condition that the voltage value of the battery is higher than the second voltage threshold value, so that the flat plate stops charging the touch pen, and the safety of the storage battery in the touch pen is ensured.
On the basis of the above embodiments, the embodiments of the present application provide a schematic diagram of a wireless charging control manner of a stylus, where,
fig. 6A is a schematic diagram of wireless charging of a stylus by a tablet in a tablet start-up state according to an embodiment of the present application, where, as shown in fig. 6A, when the tablet is in a start-up state and the stylus is located at a preset charging position, a charging module state of the tablet is in TX mode and a charging module state of the stylus is in RX mode; the output coil L1 of the flat plate and the wireless charging coil L2 of the touch pen form a transformer T1, the double-pole double-throw switch K1 is connected to the wireless charging integrated circuit (Intergerated Circuit, IC) end (not shown in the figure) of the flat plate, so that the wireless charging IC is connected with the L1, and a charging power signal output by the wireless charging IC is transmitted to the wireless charging coil L2 of the touch pen through the transformer T1, so that the touch pen is charged.
It can be appreciated that when the tablet is in the on state and the stylus is not in the preset charging position, i.e., the stylus is in the active state, the stylus is not charged.
Fig. 6B is a schematic diagram of the wireless charging coil L1 connected to the detection circuit before the panel is turned off, as shown in fig. 6B, when the panel receives a shutdown signal but is not yet in a shutdown state, and the stylus is in a preset position, the charging module state of the panel is in a TX transmitting state, and the charging module state of the stylus is in an RX receiving state; the double-pole double-throw switch K1 is connected to the detection circuit end, so that the detection circuit is connected with the L1.
Fig. 6C is a schematic diagram of the tablet computer in the off state of the tablet computer provided by the embodiment of the application when the battery voltage of the stylus is lower than the voltage threshold, as shown in fig. 6C, when the tablet computer is in the off state but the battery voltage of the stylus is lower than the voltage threshold, the charging module state of the stylus is in the TX transmitting state, the charging module state of the stylus is also in the TX transmitting state, the power transmitting circuit of the stylus transmits a power signal to the coil L2, and the power signal on the L2 is transmitted to the coil L1 in the tablet computer through the transformer T1 and is transmitted to the detection circuit connected with the L1. Here, the stylus pen will enter an RX reception state after transmitting the power signal.
Fig. 6D is a schematic diagram of charging a stylus by a tablet computer through generating a tablet computer power signal by a power signal in a tablet computer power-off state according to an embodiment of the present application, as shown in fig. 6D, after the power signal is received by the detection circuit, the received power signal is converted into a tablet computer power-on signal, so that the tablet computer is powered on, and after the tablet computer is powered on, a wireless charging IC is connected to the coil L1, and charges the stylus through the wireless charging IC (not shown in the figure).
On the basis of the above embodiment, an embodiment of the present application provides a method for controlling wireless charging of a stylus, as shown in fig. 7, where the process includes:
step S701: the wireless charging module of the tablet is in a TX mode;
here, when the stylus is adsorbed at a specific position of the tablet, and the tablet is in a power-on state, the wireless charging module of the tablet is in a TX state, and charging power is sent to the stylus through the wireless charging IC;
step S702: the wireless charging module of the stylus is in an RX mode;
here, the stylus receives the charging power sent by the wireless charging IC to the stylus, and the wireless charging module of the stylus is in an RX mode;
step S703: the panel receives a shutdown operation;
step S704: the stylus enters a standby state;
it can be appreciated that after the tablet receives the shutdown operation, the tablet stops sending charging power to the stylus, and the stylus enters a standby state.
Step S705: the coil of the flat plate is switched to a detection circuit;
here, the coil of the pad may be a specific coil of the pad forming a transformer with the coil of the stylus pen.
It will be appreciated that the flat panel enters a shutdown state after the coil of the flat panel is switched to the detector circuit.
Step S706: the wireless charging module of the stylus is in an RX mode;
here, the wireless charging module of the stylus is in RX mode during the process of the coil of the tablet switching to the detection circuit, while the tablet is not yet completely powered off.
Step S707: when the battery voltage of the touch pen is lower than a voltage threshold value, a wireless charging module of the touch pen is changed from an RX mode to a TX mode, and a power signal is triggered to be sent to a flat plate;
step S708: the detection circuit of the panel receives a power signal sent by the touch pen and converts the power signal sent by the touch pen into a starting signal of the panel;
step S709: after the flat plate is started, the coil is switched back to the wireless charging IC, and the touch pen is charged through the wireless charging IC;
step S710: the wireless charging module of the touch pen is changed from a TX mode to an RX mode and enters a charging state.
The embodiment of the application also provides a touch pen and a detection circuit, as shown in fig. 8, the detection circuit comprises a coil L1, a first capacitor C1, a first diode D1, a second diode D2, a second capacitor C2, first to fifth resistors R1 to R5, a budget amplifier U1, an analog grounding end SGND and a direct-current voltage VSYS (from a flat-panel storage battery);
one end of L1 is connected with one end of C1, and the other end of C1 is connected with the negative electrode of D1 and is used for filtering a power signal; the negative electrode of D1 is connected with the positive electrode of D2, the positive electrode of D1 is connected to SGND, and D1 and D2 form a half-wave rectifying circuit to realize rectifying treatment of power signals; the parallel branch formed by C2 and R1 is connected between the negative end of D2 and SGND in a bridging way and is used for filtering the output voltage of the rectified direct current; r2 is between the same-direction input end of U1 and the common node of D2, C2 and R1, R3 and R4 are connected in series to form a series main path between the output end of U1 and the opposite-direction input end, R5 is between the opposite-direction input end of U1 and SGND, and the output end of U1 is used as a flat-panel startup signal. Here, the dc voltage VSYS is used to supply a dc power supply to U1.
The stylus pen comprises a coil L2 and a power transmission circuit for transmitting power, wherein the L2 is spanned between output ends V+ and V-of the power transmission circuit.
On the basis of the above embodiment, the embodiment of the present application further provides a wireless charging circuit of a stylus pen, as shown in fig. 9, where the wireless charging circuit 900 of the stylus pen includes:
a detection circuit 901 for receiving a first power signal; generating a start-up signal of the panel in response to the first power signal, so that the panel is started up; the first power signal is a power signal generated by a second power signal transmitted by a power transmitting circuit of the touch pen of the tablet;
the tablet control circuit 902 is configured to control the wireless charging module of the tablet to charge the stylus when the tablet is in a power-on state.
An embodiment of the present application provides another wireless charging circuit of a stylus, as shown in fig. 10, where a wireless charging circuit 1000 of the stylus includes:
a stylus control circuit 1001 for acquiring a battery voltage value of the stylus; controlling a power transmitting circuit of the stylus to transmit a second power signal under the condition that the battery voltage value is lower than a first voltage threshold value, so that a detection circuit of the flat panel receives a first power signal generated based on the second power signal; and controlling the wireless charging module receiving the tablet to charge the touch pen.
The foregoing description of various embodiments is intended to highlight differences between the various embodiments, which may be the same or similar to each other by reference, and is not repeated herein for the sake of brevity.
The methods disclosed in the method embodiments provided by the application can be arbitrarily combined under the condition of no conflict to obtain a new method embodiment.
The features disclosed in the embodiments of the products provided by the application can be combined arbitrarily under the condition of no conflict to obtain new embodiments of the products.
The features disclosed in the embodiments of the method or the device provided by the application can be arbitrarily combined under the condition of no conflict to obtain a new embodiment of the method or the device.
The examples of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are all within the protection of the present application.
Claims (10)
1. A method of wireless charging of a stylus, the method comprising:
under the condition that the flat panel is in a shutdown state, a detection circuit of the flat panel receives a first power signal; the first power signal is a power signal generated by a second power signal sent by a power sending circuit of the touch pen of the tablet, and the second power signal is used for representing that the voltage value of the battery is lower than a first voltage threshold value;
the detection circuit responds to the first power signal to generate a starting signal of the panel so that the panel is started;
and under the condition that the tablet is in a starting state, the controller of the tablet controls the wireless charging module of the tablet to charge the touch pen.
2. The method of claim 1, wherein the tablet includes a first coil that forms a transformer with a second coil of the stylus, the controller of the tablet controlling a wireless charging module of the tablet to charge the stylus with the tablet in an on state, comprising:
when the flat plate is in a starting state and the touch pen is positioned at a specific position of the flat plate, the controller of the flat plate controls the first coil to be connected with the wireless charging module of the flat plate; the specific position represents a position where the first coil is disposed;
the controller of the tablet controls the wireless charging module to send a charging power signal to the first coil, so that the second coil senses the corresponding charging power signal, and charging of the touch pen is achieved.
3. The method of claim 2, wherein the detection circuit of the panel receives a first power signal, comprising:
the first coil senses the second power signal on the second coil to generate the first power signal under the condition that the stylus is positioned at the specific position;
the first coil delivers the first power signal to the detection circuit.
4. A method according to claim 2 or 3, characterized in that the method further comprises:
the controller of the tablet determines the charging time length of the wireless charging module of the tablet for charging the stylus;
and under the condition that the charging time length reaches a charging time length threshold value, the controller of the flat panel controls to disconnect the connection between the first coil and the wireless charging module of the flat panel, so that the flat panel stops charging the touch pen.
5. The method according to claim 4, wherein the method further comprises:
after the tablet stops charging the stylus, the controller of the tablet determines whether a touch operation to the tablet is received within a specific time period;
and under the condition that touch operation is not received, the controller of the flat panel controls and triggers a shutdown signal of the flat panel, so that the flat panel is shut down.
6. A method of wireless charging of a stylus, the method comprising:
the controller of the touch control pen obtains a battery voltage value of the touch control pen;
when the battery voltage value is lower than a first voltage threshold value, the controller of the touch pen controls the power transmitting circuit of the touch pen to transmit a second power signal, so that the detection circuit of the flat panel receives a first power signal generated based on the second power signal in a shutdown state of the flat panel, and the first power signal is used for enabling the detection circuit to generate a startup signal of the flat panel;
and the controller of the touch control pen controls the wireless charging module receiving the tablet to charge the touch control pen.
7. The method of claim 6, wherein the stylus includes a second coil forming a transformer with the first coil of the tablet;
and when the battery voltage value is lower than a first voltage threshold value, the controller of the stylus controls the power transmitting circuit of the stylus to transmit a second power signal, so that the detection circuit of the tablet receives the first power signal, and the method comprises the following steps:
and under the condition that the voltage value of the battery is lower than a first voltage threshold value, the controller of the touch pen controls the power transmission circuit of the touch pen to transmit the second power signal to the second coil, so that the first coil of the flat panel senses the second power signal on the second coil to generate the first power signal.
8. The method according to claim 6 or 7, characterized in that the method further comprises:
and under the condition that the voltage value of the battery is higher than a second voltage threshold value, the controller of the touch control pen controls to disconnect a second coil loop of the touch control pen, so that the flat plate stops charging the touch control pen.
9. A wireless charging circuit for a stylus, the circuit comprising:
the detection circuit is used for receiving a first power signal under the condition that the flat plate is in a shutdown state; generating a start-up signal of the panel in response to the first power signal, so that the panel is started up; the first power signal is a power signal generated by a second power signal sent by a power sending circuit of the touch pen of the tablet, and the second power signal is used for representing that the voltage value of the battery is lower than a first voltage threshold value;
and the tablet control circuit is used for controlling the wireless charging module of the tablet to charge the touch pen under the condition that the tablet is in a starting state.
10. A wireless charging circuit for a stylus, the circuit comprising:
the touch control pen control circuit is used for acquiring a battery voltage value of the touch control pen; controlling a power transmitting circuit of the touch pen to transmit a second power signal under the condition that the battery voltage value is lower than a first voltage threshold value, so that a detection circuit of a flat panel receives a first power signal generated based on the second power signal in a shutdown state of the flat panel, wherein the first power signal is used for enabling the detection circuit to generate a startup signal of the flat panel; and controlling the wireless charging module receiving the tablet to charge the touch pen.
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| CN202110185192.8A CN113013939B (en) | 2021-02-10 | 2021-02-10 | Wireless charging method and circuit of touch pen |
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| CN101931250A (en) * | 2009-06-22 | 2010-12-29 | 飞力凯网路股份有限公司 | Messaging device, program and information processing system |
| CN203859558U (en) * | 2014-04-25 | 2014-10-01 | Tcl通力电子（惠州）有限公司 | Electronic equipment and external charging circuit thereof |
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