CN218675991U - Transmitting-receiving switching circuit of active capacitance pen - Google Patents
Transmitting-receiving switching circuit of active capacitance pen Download PDFInfo
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- CN218675991U CN218675991U CN202222734222.9U CN202222734222U CN218675991U CN 218675991 U CN218675991 U CN 218675991U CN 202222734222 U CN202222734222 U CN 202222734222U CN 218675991 U CN218675991 U CN 218675991U
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Abstract
The utility model provides a send and receive switching circuit of active electric capacity pen is applied to touch terminal. It includes: the device comprises a main control circuit, a switch module, a transmitting electrode and a receiving electrode; the main control circuit is used for controlling the switch module to disconnect a path between the transmitting electrode and the receiving electrode when the active capacitance pen is in a signal transmitting state; and when the active capacitance pen is in a signal receiving state, controlling the switch module to conduct a path between the transmitting electrode and the receiving electrode. The utility model controls the switch module to be disconnected through the main control circuit, so as to prevent the high-voltage sending signal of the capacitance pen from damaging the receiving circuit, thereby improving the durability of the capacitance pen; and the switch module is controlled to be conducted through the main control circuit so as to increase the area of the capacitive pen for receiving the coupling signal and improve the signal receiving capacity of the capacitive pen.
Description
Technical Field
The utility model belongs to the technical field of the electric capacity pen, especially, relate to a send and receive switching circuit of active electric capacity pen.
Background
With the increasing popularity of capacitive touch screens, electronic products such as tablet computers, mobile phones and navigators are full of words, although the capacitive touch screens can be touched by fingers, the display screens are easily polluted due to the pollution of the fingers, the touch precision of the fingers is not good, and some professionals cannot achieve the required precision by the fingers, so more and more consumers seek high-quality capacitive pens to operate the touch screens.
When the active capacitive stylus and the capacitive touch screen are used in a matched mode, the capacitive touch screen can send a string of uplink signals to the active capacitive stylus, the active capacitive stylus receives the signals, analyzes the signals and then sends downlink signals to the screen synchronously, and therefore the capacitive stylus and the capacitive touch screen are used in a matched mode. In the prior art, in order to increase the sensitivity of the capacitive pen by increasing the downlink signal voltage of the circuit, a discrete module is usually required to be arranged in the active capacitive pen to build a transmitting circuit and a receiving circuit, so as to avoid the interference of the excessive voltage on the receiving circuit of the capacitive pen. However, the sending electrode and the receiving electrode of the pen point need to be separated when the sending circuit and the receiving circuit are built, so that the area of the receiving electrode of the active capacitance pen is small, and the receiving capability is weak. Even if the transmitting electrode and the receiving electrode are shared, the pen point of the capacitance pen can transmit signals with too strong intensity, and the phenomenon that a receiving circuit is damaged can be caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an active electric capacity pen's send and receive switching circuit aims at preventing that high pressure sending signal from damaging the receiving circuit of electric capacity pen, has improved the durability of electric capacity pen.
In order to achieve the above object, the utility model provides a transmit-receive switching circuit of active electric capacity pen is applied to touch terminal, touch terminal is used for exporting and goes upward the signal, the transmit-receive switching circuit of active electric capacity pen includes: the device comprises a main control circuit, a switch module, a transmitting electrode, a receiving electrode, an uplink receiving circuit and a downlink transmitting circuit;
the controlled end of the switch module is connected with the control end of the main control circuit, the input end of the switch circuit is connected with the output end of the downlink transmitting circuit, and the switch module is also electrically connected with the transmitting electrode and the receiving electrode respectively; the output end of the main control circuit is connected with the input end of the downlink sending circuit, and the input end of the main control circuit is connected with the output end of the uplink receiving circuit;
the main control circuit is used for outputting a downlink signal of the capacitive pen to the downlink sending circuit;
the downlink sending circuit is used for boosting the voltage corresponding to the downlink signal and then outputting a second downlink signal to the input end of the switch module;
the switch module is used for outputting the second downlink signal to the sending electrode;
the transmitting electrode is used for outputting the second downlink signal to the touch terminal;
the receiving electrode is used for outputting an uplink signal of the touch terminal to the uplink receiving circuit;
the uplink receiving circuit is used for outputting the uplink signal to the main control circuit;
the switch module is further used for conducting a path between the transmitting electrode and the receiving electrode when the switch module is turned on, and disconnecting the path between the transmitting electrode and the receiving electrode when the switch module is turned off;
the main control circuit is further used for controlling the switch module to be switched off when the active capacitance pen is in a sending state, and controlling the switch module to be switched on when the active capacitance pen is in a receiving state.
Optionally, the switching module comprises a switching device having a controlled pin, a signal input pin, a transmitting electrode pin, and a receiving electrode pin;
a sending electrode pin of the switching device is connected with the sending electrode;
a receiving electrode pin of the switching device is connected with the receiving electrode;
the signal input pin of the switching device is connected with the output end of the downlink transmitting circuit;
and the controlled pin of the switching device is connected with the control end of the main control circuit.
Optionally, the master control circuit includes:
the main control chip is provided with a control pin, an input pin and an output pin;
the control pin of the main control chip is connected with the controlled end of the switch module;
the input pin of the main control chip is connected with the output end of the uplink receiving circuit;
and the output pin of the main control chip is connected with the input end of the downlink transmitting circuit.
Optionally, the downlink transmission circuit includes:
a triode having an input pin and an output pin;
the input pin of the triode is connected with the output end of the main control circuit;
and the output pin of the triode is connected with the input end of the switch module.
Optionally, the uplink receiving circuit includes:
the uplink receiving chip is provided with an input pin and a first output pin;
the input pin of the uplink receiving chip is connected with the receiving electrode;
and a first output pin of the uplink receiving chip is connected with the input end of the main control circuit.
Optionally, the sending and receiving switching circuit of the active capacitive pen further includes:
a boost circuit comprising a diode;
the diode is provided with an input pin and a power supply output pin;
the uplink receiving chip is also provided with a second output pin, and the input pin of the diode is connected with the second output pin of the uplink receiving chip;
the downlink transmitting circuit is also provided with a power input end, and a power output pin of the diode is connected with the power input end of the downlink transmitting circuit.
Optionally, the sending and receiving switching circuit of the active capacitive pen further includes:
a battery for outputting a battery voltage;
the input end of the power management module is connected with the output end of the battery, the first output end of the power management module is connected with the power end of the downlink sending circuit, the second output end of the power management module is connected with the power end of the uplink receiving circuit, the third output end of the power management module is connected with the power end of the switch module, and the fourth output end of the power management module is connected with the power end of the main control circuit;
and the power supply management module is used for converting the battery voltage into a stable voltage and supplying the stable voltage to the downlink sending circuit, the uplink receiving circuit, the switch module and the main control circuit for working.
Optionally, the sending and receiving switching circuit of the active capacitive pen further includes:
a charging interface;
the charging interface is electrically connected with the battery.
The utility model provides a send and receive switching circuit of active electric capacity pen is applied to touch terminal, and touch terminal is used for the output to go upward the signal, and the send and receive switching circuit of active electric capacity pen includes: the device comprises a main control circuit, a switch module, a transmitting electrode, a receiving electrode, an uplink receiving circuit and a downlink transmitting circuit; the main control circuit is used for outputting a downlink signal of the capacitive pen to the downlink sending circuit; the downlink transmitting circuit is used for outputting a downlink signal of the capacitive pen to the input end of the switch module; the switch module is used for outputting the downlink signal to the sending electrode; the sending electrode is used for outputting the downlink signal to the touch terminal; the receiving electrode is used for outputting an uplink signal of the touch terminal to the uplink receiving circuit; the uplink receiving circuit is used for outputting an uplink signal to the main control circuit; the switch module is also used for conducting a path between the transmitting electrode and the receiving electrode when the switch module is started and disconnecting the path between the transmitting electrode and the receiving electrode when the switch module is turned off; and the main control circuit is used for controlling the switch module to be switched off when the active capacitance pen is in a signal sending state and controlling the switch module to be switched on when the active capacitance pen is in a signal receiving state. The utility model discloses a master control circuit control switch module disconnection transmitting electrode and receive electrode between the route, when preventing that active electric capacity pen is in the signalling state, its high pressure transmission signal damages receiving circuit to the durability of electric capacity pen has been improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of a circuit function module of a transmitting/receiving switching circuit of an active capacitance pen according to the present invention;
fig. 2 is a schematic diagram of a circuit structure of the switch module of the transmitting/receiving switching circuit of the active capacitance pen of the present invention;
fig. 3 is a schematic circuit structure diagram of the main control circuit of the transmitting and receiving switching circuit of the active capacitance pen of the present invention;
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; \8230;) are provided in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "a and/or B" as an example, including either the a aspect, or the B aspect, or both the a and B aspects. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
It should be understood that, when the active capacitive stylus and the capacitive touch screen are used in a paired manner, the capacitive touch screen may send a series of uplink signals to the active capacitive stylus, and the active capacitive stylus receives the uplink signals to analyze the uplink signals and then synchronously sends downlink signals to the screen, so as to complete the use of the capacitive stylus and the capacitive touch screen in a matched manner. In order to increase the downlink signal voltage of the circuit to enhance the sensitivity of the capacitive pen, a discrete module is usually required to be arranged in the active capacitive pen to build a transmitting circuit and a receiving circuit, so that the interference of a high-voltage transmitting signal to the receiving circuit of the capacitive pen is avoided. However, in the prior art, the transmitting electrode and the receiving electrode of the pen point need to be separated to construct the transmitting circuit and the receiving circuit, so that the area of the receiving electrode of the active capacitance pen is small, and the signal receiving capability of the capacitance pen is weakened. If the transmitting electrode and the receiving electrode of the pen point are shared, the phenomenon that the transmitting signal intensity of the pen point of the capacitance pen is too strong and the receiving circuit is damaged can be caused.
Therefore, the utility model provides a transmit-receive switching circuit of active electric capacity pen is applied to touch terminal, touch terminal is used for the output to go upward the signal, transmit-receive switching circuit of active electric capacity pen includes: the main control circuit 10, the switch module 20, the transmitting electrode 40, the receiving electrode 60, the uplink receiving circuit 50 and the downlink transmitting circuit 30;
the controlled end of the switch module 20 is connected to the control end of the main control circuit 10, the input end of the switch circuit is connected to the output end of the downlink transmission circuit 30, and the switch module 20 is further electrically connected to the transmission electrode 40 and the reception electrode 60, respectively; the output end of the main control circuit 10 is connected to the input end of the downlink transmitting circuit 30, and the input end of the main control circuit 10 is connected to the output end of the uplink receiving circuit 50;
the main control circuit 10 is configured to output a downlink signal of the capacitive pen to the downlink transmitting circuit 30;
the downlink transmitting circuit 30 is configured to boost a voltage corresponding to the downlink signal and output a second downlink signal to the input end of the switch module 20;
the switch module 20 is configured to output the second downlink signal to the transmitting electrode 40;
the transmitting electrode 40 is configured to output the second downlink signal to the touch terminal;
the receiving electrode 60 is configured to output an uplink signal of the touch terminal to the uplink receiving circuit 50;
the uplink receiving circuit 50 is configured to output the uplink signal to the main control circuit 10;
the switch module 20 is further configured to turn on a path between the transmitting electrode 40 and the receiving electrode 60 when turned on, and turn off the path between the transmitting electrode 40 and the receiving electrode 60 when turned off;
the main control circuit 10 is further configured to control the switch module 20 to be turned off when the active capacitive stylus is in a sending state, and control the switch module 20 to be turned on when the active capacitive stylus is in a receiving state.
It should be explained that the touch terminal can be implemented by a touch screen of a tablet computer and a touch screen of a smart phone, and the touch screen of the tablet computer is taken as an example in the embodiment for description.
Specifically, in practical applications, when a user uses the active capacitive pen in cooperation with the tablet computer, the touch screen of the tablet computer outputs an uplink signal, the uplink receiving circuit in the active capacitive pen receives the uplink signal of the touch screen of the tablet computer, the main control circuit 10 controls to output a downlink signal, and the downlink sending circuit receives the downlink signal, boosts a voltage corresponding to the downlink signal, and outputs the boosted voltage to the touch screen of the tablet computer. When the active capacitance pen is in a signal transmission state, the main control circuit 10 controls the switch circuit 20 thereof to open the path between the transmitting electrode 40 and the receiving electrode 60, so as to cut off the signal transmission between the transmitting electrode 40 and the receiving electrode 60; when the active capacitance pen is in a signal receiving state, the main control circuit 10 controls the switch circuit 20 to conduct a path between the transmitting electrode 40 and the receiving electrode 60, that is, the transmitting electrode 40 is electrically connected with the receiving electrode 60, and the area of the receiving electrode 60 is increased, so that the area for receiving the coupled signal is increased, and the performance of signal receiving is improved.
The utility model provides a send and receive switching circuit of active electric capacity pen is applied to touch terminal, and touch terminal is used for the output to go upward the signal, and the send and receive switching circuit of active electric capacity pen includes: the device comprises a main control circuit, a switch module, a transmitting electrode, a receiving electrode, an uplink receiving circuit and a downlink transmitting circuit; the main control circuit is used for outputting a downlink signal of the capacitive pen to the downlink sending circuit; the downlink sending circuit is used for boosting the voltage corresponding to the downlink signal and then outputting a second downlink signal to the input end of the switch module; the switch module is used for outputting a second downlink signal to the sending electrode; the sending electrode is used for outputting a second downlink signal to the touch terminal; the receiving electrode is used for outputting an uplink signal of the touch terminal to the uplink receiving circuit; the uplink receiving circuit is used for outputting an uplink signal to the main control circuit; the switch module is also used for conducting a path between the transmitting electrode and the receiving electrode when the switch module is started and disconnecting the path between the transmitting electrode and the receiving electrode when the switch module is turned off; the main control circuit is further used for controlling the switch module to be disconnected when the active capacitance pen is in a sending state, and controlling the switch module to be connected when the active capacitance pen is in a receiving state. The utility model discloses a master control circuit control switch module disconnection transmitting electrode and receive electrode between the route, when preventing that active electric capacity pen is in the signalling state, its high pressure transmission signal damages receiving circuit to the durability of electric capacity pen has been improved.
In this embodiment, referring to fig. 2, the switch module includes a switch device U2, where the switch device U2 has a controlled pin, a signal input pin TIP1, a transmitting electrode pin TX, and a receiving electrode pin RX;
a transmitting electrode pin TX of the switching device U2 is connected with the transmitting electrode 40;
a receiving electrode pin RX of the switching device U2 is connected with the receiving electrode 60;
a signal input pin TIP1 of the switching device U2 is connected with an output end of the downlink transmitting circuit 30;
the controlled pin SWITCH of the switching device U2 is connected to the control end of the main control circuit 10.
It should be understood that the downlink transmission circuit 30 is a driving circuit for generating a high-voltage coding signal by the active capacitive stylus. Due to the limitation of the receiving capacity of the capacitive touch screen and the interference of noise, the active capacitive pen is expected to send higher signal peak intensity to meet the requirement of receiving the semaphore of the capacitive touch screen, but larger signal amplitude is more likely to affect circuits of other parts; the uplink receiving circuit 50 is a receiver filtering or amplifying circuit of the active capacitive pen for the uplink signal coupled to the touch screen; it should be understood that the input signal amplitude of the upstream receiving circuit 50 must not be too high, which could result in saturation and damage to the circuit.
Therefore, in this embodiment, a switch device U2 is added inside the active capacitance pen, and the main control circuit 10 controls the switch device U2 to open or close the path between the transmitting electrode 40 and the receiving electrode 60 by determining two different states of transmission and reception of the active capacitance pen, so as to achieve the effect of electrode switching, prevent the high-voltage transmitting signal from damaging the uplink receiving circuit of the capacitance pen, and enhance the signal receiving capability of the active capacitance pen.
Specifically, referring to fig. 2, when the active capacitive stylus is in a signal transmission state, the control end of the main control circuit 10 inputs a first control signal through the controlled pin SWITCH of the switching device U2 to control the disconnection of the path between the transmitting electrode pin TX and the receiving electrode pin RX of the disconnecting switching device U2; at this time, the sending electrode pin TX is connected with the signal input pin TIP1, the downlink sending circuit 30 transmits a downlink signal of the active capacitive pen to the sending electrode pin TX through the signal input pin TIP1, and the sending electrode pin TX outputs the downlink signal to the touch terminal; it can be understood that, when the active capacitive stylus is in the signal transmission state, the transmitting electrode 40 is disconnected from the receiving electrode 60, that is, the uplink receiving circuit 50 connected to the receiving electrode 60 is not damaged by the high-voltage transmission signal of the capacitive stylus.
Referring to fig. 2, when the active capacitive stylus is in a signal receiving state, the control end of the main control circuit 10 inputs a second control signal through the controlled pin SWITCH of the switching device U2 to control the conduction of the path between the transmitting electrode pin TX and the receiving electrode pin RX of the switching device U2; at this time, the transmitting electrode pin TX is connected with the receiving electrode pin RX; it can be understood that when the active capacitive pen is in a signal receiving state, the transmitting electrode 40 and the receiving electrode 60 are in conductive connection, the transmitting electrode 40 and the receiving electrode 60 are combined to increase an area for receiving a coupled signal, and an uplink signal received by the active capacitive pen not only passes through the receiving electrode 60, but also passes through the transmitting electrode 40, so that the signal receiving capability of the active capacitive pen is enhanced.
In this embodiment, referring to fig. 3, the main control circuit includes:
the main control chip U1 is provided with a control pin SWITCH, an input pin P14 and an output pin P15;
a control pin SWITCH of the main control chip U1 is connected to the controlled end of the SWITCH module 20;
the input pin P14 of the main control chip U1 is connected to the output end of the uplink receiving circuit 50.
The output pin P15 of the main control chip U1 is connected to the input end of the downlink transmission circuit 30.
It can be understood that the active capacitive pen is in the receiving state for a long time, i.e. the transmitting electrode 40 and the receiving electrode 60 are in the conductive connection state for a long time. When the main control chip U1 receives an uplink signal output by the uplink receiving circuit through the input pin P14, the main control chip U1 analyzes the uplink signal and then judges a time window of a downlink sending signal; the main control chip U1 obtains the time for transmitting the signal according to the time window for transmitting the signal in the downlink, and outputs a first control signal through the SWITCH pin to control the SWITCH module 20 to be switched off; meanwhile, the main control chip U1 outputs a downlink transmission signal to the downlink transmission circuit 30 through the output pin P15, the downlink transmission circuit 30 increases the voltage corresponding to the downlink transmission signal and then outputs a second downlink signal to the transmission electrode 40, and the transmission electrode 40 outputs the second downlink signal to the touch terminal, thereby completing the signal transmission process of the active capacitive stylus. The main control chip U1 can also judge the time window of the uplink received signal after analyzing the uplink signal; the main control chip U1 obtains the time for receiving the active capacitance pen signal according to the time window for receiving the uplink signal, and outputs a second control signal through the control pin SWITCH to control the SWITCH module 20 to be turned on, at this time, the main control chip U1 stops outputting the downlink transmission signal to the downlink transmission circuit 30 through the output pin P15. In this embodiment, the main control chip U1 outputs a control signal to the SWITCH module 20 through the control pin SWITCH to control the SWITCH module 20 to be turned on and off, so as to control the electrode switching in the signal sending state or the signal receiving state.
In this embodiment, the downlink transmission circuit includes:
a triode having an input pin and an output pin;
the input pin of the triode is connected with the output end of the main control circuit 10;
the output pin of the triode is connected with the input end of the switch module 20.
It can be understood that, in this embodiment, the transmitting electrode 40 serves as an antenna to transmit the downlink signal of the active capacitive pen to the touch terminal, and the transmitted downlink signal is derived from the current of the internal circuit of the active capacitive pen. Specifically, when the active capacitive stylus is in a signal sending state, the main control circuit 10 controls to output a downlink signal, the input pin of the triode receives the downlink signal, the downlink signal passes through the current amplification effect of the triode and then outputs a corresponding second downlink signal to the input end of the switch module 20 through the output pin of the triode, the switch module 20 outputs the second downlink signal to the sending electrode 40 through the output end, and the sending electrode 40 sends the second downlink signal to the touch terminal.
It should be understood that the second downlink signal corresponds to a high voltage signal, and due to the limitation of the receiving capability of the touch screen, the signal sent by the active capacitive stylus is a high voltage signal, which can meet the requirement of receiving the semaphore of the touch screen terminal.
In this embodiment, the uplink receiving circuit includes:
the uplink receiving chip is provided with an input pin and a first output pin;
the input pin of the uplink receiving chip is connected with the receiving electrode 60;
and a first output pin of the uplink receiving chip is connected with the input end of the main control circuit 10.
It can be understood that, when the receiving electrode 60 of the active capacitive pen receives an uplink signal, the input pin of the uplink receiving chip receives the uplink signal, and the uplink receiving chip outputs the uplink signal to the input end of the main control circuit 10 through the first output pin; the main control circuit 10 can determine a signal sending time window and a signal receiving time window of the active capacitive pen according to the acquired uplink signal, so as to output a control signal to the switch module 20, so as to control the on/off of the switch module 20, and to control the active capacitive pen to complete the switching of the electrodes in the signal sending state and the signal receiving state.
In addition, the present embodiment further includes a voltage boost circuit, where the voltage boost circuit includes a diode;
the diode is provided with an input pin and a power supply output pin;
the uplink receiving chip is also provided with a second output pin, and the input pin of the diode is connected with the second output pin of the uplink receiving chip;
the downlink transmission circuit 30 further has a power input terminal, and a power output pin of the diode is connected to the power input terminal of the downlink transmission circuit 30.
It can be understood that when the active capacitive stylus is in a signal transmitting state, the input pin of the uplink receiving chip receives the uplink signal of the receiving electrode 60, and meanwhile, the second output pin of the uplink receiving chip outputs a boost signal to the input pin of the diode, and the diode receives the boost signal, boosts the voltage of the power supply, and outputs a corresponding high-voltage signal to the downlink transmitting circuit 30 through the power supply output pin. It can be understood that the downlink transmitting circuit 30 receives the high voltage signal output by the diode and then outputs a second downlink signal to the input end of the switch module 20, the switch module 20 outputs the second downlink signal to the transmitting electrode 40, and the transmitting electrode 40 outputs the second downlink signal to the touch terminal; in this embodiment, after the downlink signal output by the active capacitive stylus is boosted by the diode, a higher voltage signal is output through the transmitting electrode 40 to meet the requirement of receiving the semaphore at the touch screen end.
In this embodiment, the transmitting and receiving switching circuit of the active capacitive pen further includes:
a battery for outputting a battery voltage;
the input end of the power management module is connected with the output end of the battery, the first output end of the power management module is connected with the power end of the downlink sending circuit, the second output end of the power management module is connected with the power end of the uplink receiving circuit, the third output end of the power management module is connected with the power end of the switch module, and the fourth output end of the power management module is connected with the power end of the main control circuit;
and the power supply management module is used for converting the battery voltage into stable voltage and supplying the stable voltage to the downlink sending circuit, the uplink receiving circuit, the switch module and the main control circuit for working.
It is understood that the positive and negative electrodes of the battery together form the output end of the battery;
specifically, the power management module is used for improving the utilization rate of the battery, preventing the battery from being overcharged and overdischarged, prolonging the service life of the battery and monitoring the state of the battery. In this embodiment, the battery outputs a voltage to the power management module, and the power management module outputs a stable voltage to the downlink transmitting circuit 30, the uplink receiving circuit 50, the switch module 20, and the main control circuit 10 through the voltage conversion processing of the power management module.
In this embodiment, the transmitting and receiving switching circuit of the active capacitive pen further includes:
a charging interface;
the charging interface is electrically connected with the battery.
It can be understood that the charging interface may adopt a TYPE-C interface and a USB interface, and a user may perform a charging operation on the active capacitive pen by electrically connecting the charging interface with the battery, so as to maintain a normal operation of the active capacitive pen.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (8)
1. A sending and receiving switching circuit of an active capacitive pen is applied to a touch terminal, and the touch terminal is used for outputting an uplink signal, and the sending and receiving switching circuit of the active capacitive pen comprises: the device comprises a main control circuit, a switch module, a transmitting electrode, a receiving electrode, an uplink receiving circuit and a downlink transmitting circuit;
the controlled end of the switch module is connected with the control end of the main control circuit, the input end of the switch module is connected with the output end of the downlink transmitting circuit, and the switch module is also electrically connected with the transmitting electrode and the receiving electrode respectively; the output end of the main control circuit is connected with the input end of the downlink sending circuit, and the input end of the main control circuit is connected with the output end of the uplink receiving circuit;
the main control circuit is used for outputting a downlink signal of the capacitive pen to the downlink sending circuit;
the downlink sending circuit is used for boosting the voltage corresponding to the downlink signal and then outputting a second downlink signal to the input end of the switch module;
the switch module is used for outputting the second downlink signal to the sending electrode;
the transmitting electrode is used for outputting the second downlink signal to the touch terminal;
the receiving electrode is used for outputting an uplink signal of the touch terminal to the uplink receiving circuit;
the uplink receiving circuit is used for outputting the uplink signal to the main control circuit;
the switch module is further used for conducting a path between the transmitting electrode and the receiving electrode when the switch module is turned on, and disconnecting the path between the transmitting electrode and the receiving electrode when the switch module is turned off;
the main control circuit is further used for controlling the switch module to be switched off when the active capacitance pen is in a sending state, and controlling the switch module to be switched on when the active capacitance pen is in a receiving state.
2. The active capacitive pen transmit-receive switching circuit of claim 1 wherein the switching module comprises a switching device having a controlled pin, a signal input pin, a transmit electrode pin, and a receive electrode pin;
a sending electrode pin of the switching device is connected with the sending electrode;
a receiving electrode pin of the switching device is connected with the receiving electrode;
the signal input pin of the switching device is connected with the output end of the downlink transmitting circuit;
and the controlled pin of the switching device is connected with the control end of the main control circuit.
3. The active capacitive stylus transmit-receive switching circuit as claimed in claim 1, wherein the master circuit comprises:
the main control chip is provided with a control pin, an input pin and an output pin;
the control pin of the main control chip is connected with the controlled end of the switch module;
the input pin of the main control chip is connected with the output end of the uplink receiving circuit;
and the output pin of the main control chip is connected with the input end of the downlink transmitting circuit.
4. The active capacitive stylus transmit-receive switching circuit as claimed in claim 1, wherein the downlink transmit circuit comprises:
a triode having an input pin and an output pin;
the input pin of the triode is connected with the output end of the main control circuit;
and the output pin of the triode is connected with the input end of the switch module.
5. The active capacitive stylus tx/rx switching circuit according to claim 1, wherein the upstream receive circuit comprises:
the device comprises an uplink receiving chip, a first receiving chip and a second receiving chip, wherein the uplink receiving chip is provided with an input pin and a first output pin;
the input pin of the uplink receiving chip is connected with the receiving electrode;
and a first output pin of the uplink receiving chip is connected with the input end of the main control circuit.
6. The active capacitive stylus transmit-receive switching circuit as claimed in claim 5, further comprising:
a boost circuit comprising a diode;
the diode is provided with an input pin and a power supply output pin;
the uplink receiving chip is also provided with a second output pin, and the input pin of the diode is connected with the second output pin of the uplink receiving chip;
the downlink transmitting circuit is also provided with a power input end, and a power output pin of the diode is connected with the power input end of the downlink transmitting circuit.
7. The active capacitive stylus tx/rx switching circuit according to claim 1, further comprising:
a battery for outputting a battery voltage;
the input end of the power management module is connected with the output end of the battery, the first output end of the power management module is connected with the power end of the downlink sending circuit, the second output end of the power management module is connected with the power end of the uplink receiving circuit, the third output end of the power management module is connected with the power end of the switch module, and the fourth output end of the power management module is connected with the power end of the main control circuit;
and the power supply management module is used for converting the battery voltage into stable voltage and supplying the stable voltage to the downlink sending circuit, the uplink receiving circuit, the switch module and the main control circuit for working.
8. The active capacitive stylus tx/rx switching circuit according to claim 7, further comprising:
a charging interface;
the charging interface is electrically connected with the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222734222.9U CN218675991U (en) | 2022-10-17 | 2022-10-17 | Transmitting-receiving switching circuit of active capacitance pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222734222.9U CN218675991U (en) | 2022-10-17 | 2022-10-17 | Transmitting-receiving switching circuit of active capacitance pen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218675991U true CN218675991U (en) | 2023-03-21 |
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ID=85564547
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222734222.9U Active CN218675991U (en) | 2022-10-17 | 2022-10-17 | Transmitting-receiving switching circuit of active capacitance pen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218675991U (en) |
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2022
- 2022-10-17 CN CN202222734222.9U patent/CN218675991U/en active Active
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