CN203387216U - Point-reading pen - Google Patents
Point-reading pen Download PDFInfo
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- CN203387216U CN203387216U CN201320372678.3U CN201320372678U CN203387216U CN 203387216 U CN203387216 U CN 203387216U CN 201320372678 U CN201320372678 U CN 201320372678U CN 203387216 U CN203387216 U CN 203387216U
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Abstract
The utility model relates to the field of point-reading machines and discloses a point-reading pen. The point-reading pen comprises a voltage-stabilizing and filtering power interface circuit which is externally connected with an external power supply. The point-reading pen further comprises a transmitting circuit used for transmitting a signal to a point-reading host, a rechargeable battery connected with the transmitting circuit, and a charging circuit which is respectively connected with the power interface circuit and the rechargeable battery, receives a first power supply output by the power interface circuit and adopts the first power supply to charge the rechargeable battery. The point-reading pen provided by the utility model uses the charging circuit to charge the rechargeable battery, has good versatility, is easy to use and is more user-friendly.
Description
Technical field
The utility model belongs to the point reader field, relates in particular to a kind of talking pen.
Background technology
The appearance of point reader makes preschool education obtain revolutionary development, adopt at present wireless active scheme point reader to be formed by talking pen and reading main frame, touching by talking pen to books, to placing on books reading main frame, transmit, the reading main frame is determined the some reading location of books by the sensed position to transmitting, then using the coordinate of this position as a parameter of pronunciation addressing, thereby reach the purpose of reading.
Existing above-mentioned talking pen is to transmit to the reading main frame with touching switch connection 12V disposable battery; It is stronger in order to make to transmit adopting 12V; Yet the battery versatility of 12V is poor, buy inconvenience in outlying district; In use also can't determine when electric weight deficiency of battery; Its calibrate needs the reading main frame to coordinate, and this all makes the use of point reader very inconvenient.
Existing talking pen does not have charge function, can only use disposable battery, just is finished and can only discards, and waste battery resource and when polluting, affect the normal use of point reader.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of talking pen, is intended to solve existing talking pen and adopts the disposable battery power supply, does not have charge function, brings awkward problem.
The utility model is to realize like this, a kind of talking pen, described talking pen comprises the power interface circuit that input power is carried out after voltage regulation filtering is processed exporting the first power supply, the external external power source of described power interface circuit, and described talking pen also comprises to the radiating circuit of reading main frame transmitted signal; Described talking pen also comprises:
The rechargeable battery that connects described radiating circuit;
Connect described power interface circuit and described rechargeable battery, receive the first power supply of described power interface circuit output, adopt the charging circuit of described the first power supply to described rechargeable battery charging.
Further, described talking pen also comprises:
Connect described rechargeable battery and described radiating circuit, the booster circuit that the voltage that described rechargeable battery is exported is boosted and processes;
Connect described charging circuit, described booster circuit and described radiating circuit, detect the voltage of described rechargeable battery, during lower than predetermined voltage threshold, control described booster circuit and the out-of-work low-voltage testing circuit of described radiating circuit at the voltage of described rechargeable battery.
Further, described talking pen also comprises:
Connect described charging circuit and described radiating circuit, show the indicating circuit of the operating state of the operating state of described charging circuit and/or described radiating circuit.
Further, described talking pen also comprises:
Connect described power interface circuit and described charging circuit, the first power supply that described power interface circuit is exported carries out the step-down processing, and the first power supply after step-down is exported to the reduction voltage circuit of described charging circuit.
Further, described charging circuit comprises:
Charging chip U5, filter capacitor C28, filter capacitor C29, divider resistance R19, divider resistance R20, P type metal-oxide-semiconductor Q1, Schottky diode D3, divider resistance R25, divider resistance R26, divider resistance R23, divider resistance R24, filter capacitor C35, filter capacitor C36 and filter capacitor C22;
The first end of described filter capacitor C28 and the second end connect respectively described reduction voltage circuit and ground, the first end of described filter capacitor C29 and the second end connect respectively first end and the ground of described filter capacitor C28, the power pins of described charging chip U5 and ground pin connect respectively first end and the second end of described filter capacitor C29, the drain electrode of described P type metal-oxide-semiconductor Q1, grid and source electrode connect respectively the anode of described Schottky diode D3, the second end of the first end of described divider resistance R19 and described divider resistance R19, described divider resistance R20 is connected to the pwm signal of described charging chip U5 of the second end of described divider resistance R19 and controls between pin, the first end of described divider resistance R26 and the second end connect respectively the negative electrode of described Schottky diode D3 and the voltage sample pin of described charging chip U5, after described filter capacitor C36 and described divider resistance R25 parallel connection, be connected between the second end and ground of described divider resistance R26, described filter capacitor C35 is connected between the first end and ground of described divider resistance R26, the demonstration pin of described charging chip U5 connects described indicating circuit, the first end of described filter capacitor C22 and the second end connect respectively low-voltage output pin and the ground of described charging chip U5, the first end of described divider resistance R23 and the second end connect respectively the first end of described filter capacitor C22 and the first end of described divider resistance R24, the second end ground connection of described divider resistance R24, the first end of the first end of described divider resistance R26 and described divider resistance R24 connects respectively positive pole and the negative pole of described rechargeable battery.
Further, described reduction voltage circuit comprises:
Step-down chip U3, filter capacitor C24, load resistance R15, matching capacitance C25, inductance L 1, divider resistance R16, divider resistance R14, divider resistance R18, filter capacitor C30, filter capacitor C31, filter capacitor C26 and filter capacitor C27;
Input pin and the enable pin of described step-down chip U3 connect respectively described power interface circuit, described filter capacitor C24 is connected between the power filter pin and ground of described step-down chip U3, described load resistance R15 is connected to the voltage of described step-down chip U3 and adjusts between pin and ground, the ground pin ground connection of described step-down chip U3, the first end of described matching capacitance C25 and the second end connect respectively external capacitive pin and the switch pin of described step-down chip U3, the first end of described divider resistance R16 and the second end connect respectively the feedback sample pin of described step-down chip U3 and the first end of described divider resistance R18, the second end ground connection of described R18, the second end of the described matching capacitance C25 of the first termination of described inductance L 1, after described divider resistance R14 and described filter capacitor C30 parallel connection, be connected between the first end of the second end of described inductance L 1 and described divider resistance R18, described filter capacitor C31, after filter capacitor C26 and filter capacitor C27 parallel connection, be connected between second end and ground of described inductance L 1, the first end of the described filter capacitor C28 of the second termination of described inductance L 1,
Further, described power interface circuit comprises:
ESD pipe D4, filter capacitor C12, discharge resistance R17, current-limiting resistance R13, Schottky diode D5, filter capacitor C21, filter capacitor C20, filter capacitor C33 and filter capacitor C23;
The first end of described ESD pipe D4 and the power pins (VCC1) that the second end connects respectively described external power source and ground pin, after described filter capacitor C12 and discharge resistance R17 parallel connection, be connected between the first end and ground of described ESD pipe D4, the first end of described current-limiting resistance R13 and the second end connect respectively between the enable pin of the first end of described ESD pipe D4 and described step-down chip U3, the anode of described Schottky diode D5 connects the first end of described current-limiting resistance R13, described filter capacitor C21, filter capacitor C20, after filter capacitor C33 and filter capacitor C23 parallel connection, be connected between the negative electrode and ground of described Schottky diode D5, the negative electrode of described Schottky diode D5 connects the input pin of described step-down chip U3.
Further, described low-voltage detection circuit comprises:
Low-voltage detection chip U1 and pull-up resistor R3;
The input pin of described low-voltage detection chip U1, output pin and ground pin connect respectively the positive pole of described rechargeable battery, described radiating circuit and ground, and described pull-up resistor R3 is connected between the input pin and output pin of described low-voltage detection chip U1.
Further, described radiating circuit comprises:
Switching circuit, filter capacitor C17, N-type metal-oxide-semiconductor Q2, divider resistance R10, divider resistance R11, divider resistance R12, resonant capacitance C7, resonant capacitance C8, resonant capacitance C9, resonant capacitance C1, resonant capacitance C4, resonant capacitance C18 and NPN type triode Q4;
Described switching circuit connects respectively the output pin of described low-voltage detection chip U1 and the grid of N-type metal-oxide-semiconductor Q2, described filter capacitor C17 is connected between the grid and ground of described N-type metal-oxide-semiconductor Q2, the drain electrode of described N-type metal-oxide-semiconductor Q2 and source electrode connect respectively the second end and the ground of described divider resistance R12, the first end of described divider resistance R10 and the second end connect respectively the base stage of first end and the described NPN type triode Q4 of described resonant capacitance C1, the first end of described resonant capacitance C7 and the second end connect respectively the second end of described divider resistance R10 and the second end of described divider resistance R12, described divider resistance R11 is connected between the first end of the emitter of described NPN type triode Q4 and described divider resistance R12, the collector electrode of described NPN type triode Q4 connects the second end of described resonant capacitance C1, described resonant capacitance C4 and resonance capacitor C 18 are all in parallel with described resonant capacitance C1, the first end of described resonant capacitance C9 and the second end connect respectively the second end of described resonant capacitance C1 and the first end of described divider resistance R12, described resonant capacitance C8 is in parallel with described divider resistance R12, the second end of the first end of described divider resistance R10 and described divider resistance R12 connects respectively described booster circuit, described resonant capacitance C1 is in parallel with the inductance coil of antenna,
Preferably, the switching circuit in described radiating circuit comprises:
Normal open switch and current-limiting resistance R27;
The first end of described normal open switch and the second end connect respectively the output pin of described low-voltage detection chip U1 and the grid of N-type metal-oxide-semiconductor Q2, and the first end of described current-limiting resistance R27 and the second end connect respectively the second end and the ground of described normal open switch;
Perhaps, the switching circuit in described radiating circuit comprises:
Normally closed switch;
The first end of described normally closed switch connects respectively the output pin of described low-voltage detection chip U1 and the grid of N-type metal-oxide-semiconductor Q2, the second end ground connection of described normally closed switch;
Further, described booster circuit comprises:
Chip U2, filter capacitor C2, filter capacitor C3, inductance L 2, current-limiting resistance R8, Schottky diode D1, filter capacitor C5, divider resistance R5, divider resistance R6 and filter capacitor C6 boost;
The first end of described inductance L 2 and the second end connect respectively the positive pole of described rechargeable battery and the anode of described Schottky diode D1, described filter capacitor C2 is connected between the first end and ground of described inductance L 2, described filter capacitor C3 is connected between the power pins and ground of the described chip U2 that boosts, the first end of described current-limiting resistance R8 and the second end connect respectively the second end of described inductance L 2 and the control pin of the described chip U2 that boosts, after described filter capacitor C5 and described divider resistance R5 parallel connection, be connected between the output pin of the negative electrode of described Schottky diode D1 and the described chip U2 that boosts, the ground pin of the described chip U2 that boosts connects the drain electrode of described N-type metal-oxide-semiconductor Q2, described divider resistance R6 is connected between the drain electrode of the output pin of the described chip U2 that boosts and described N-type metal-oxide-semiconductor Q2, described feedback pin of boosting chip U2 connects the power pins of the described chip U2 that boosts and the negative electrode of described Schottky diode D1, described filter capacitor C6 is connected between the negative electrode and ground of described Schottky diode D1, the negative electrode of described Schottky diode D1 connects the first end of described divider resistance R10.
Further, described radiating circuit also comprises:
Resonant capacitance C10, resonant capacitance C11, resonant capacitance C13, resonant capacitance C14, resonant capacitance C15, resonant capacitance C16 and resonant capacitance C19;
Described resonant capacitance C10 and/or described resonant capacitance C11 and/or described resonant capacitance C13 and/or described resonant capacitance C14 and/or described resonant capacitance C15 and/or described resonant capacitance C16 and/or described resonant capacitance C19 are in parallel with described resonant capacitance C1 respectively.
Further, described indicating circuit comprises:
Current-limiting resistance R21, current-limiting resistance R22 and comprise the first luminous tube and the light-emitting diode D2 of the second luminous tube;
The first end of described current-limiting resistance R21 and the second end connect respectively the demonstration pin of described charging chip U5 and the anode of the first luminous tube in described light-emitting diode D2, the minus earth of the first luminous tube in described light-emitting diode D2, the first end of described current-limiting resistance R22 and the second end connect respectively the anode of the second luminous tube in power supply (VCC3) and described light-emitting diode D2, and the negative electrode of the second luminous tube in described light-emitting diode D2 connects the drain electrode of described N-type metal-oxide-semiconductor Q2.
The utility model also provides a kind of point reader, and described point reader comprises above-mentioned talking pen.
Be compared with the prior art, the talking pen that the utility model provides, adopt charging circuit to charge to rechargeable battery, and versatility is good and easy to use, more hommization.
The accompanying drawing explanation
Fig. 1 is that the first of the talking pen that provides of the utility model forms structure chart;
Fig. 2 is that the second of the talking pen that provides of the utility model forms structure chart;
Fig. 3 is that the third of the talking pen that provides of the utility model forms structure chart;
Fig. 4 is that the 4th kind of the talking pen that provides of the utility model forms structure chart;
Fig. 5 is the 4th kind of physical circuit figure that forms structure chart of the talking pen that provides of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and the embodiments, the utility model is further elaborated.Should be appreciated that embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
For technical scheme described in the utility model is described, below by specific embodiment, describe.
The first that Fig. 1 shows the talking pen that the utility model embodiment provides forms structure, for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows.
A kind of talking pen, described talking pen comprises the power interface circuit 1 that input power is carried out after voltage regulation filtering is processed exporting the first power supply, the external external power source of described power interface circuit 1, described talking pen also comprises to the radiating circuit 4 of reading main frame transmitted signal; Described talking pen also comprises:
The rechargeable battery 3 that connects described radiating circuit 4;
Connect described power interface circuit 1 and described rechargeable battery 3, receive the first power supply of described power interface circuit 1 output, adopt the charging circuit 2 of described the first power supply to described rechargeable battery 3 chargings.
It should be noted that, described external power source comprises that storage battery, mains supply, wind energy power supply, sun-generated electric power etc. can provide the existing power supply of electric energy.
For the voltage matches required with power interface circuit 1, need to by external power source after rectifying and wave-filtering, voltage stabilizing to obtain the supply voltage with power interface circuit 1 coupling, in order to avoid burn the circuit that power interface circuit and other talking pens comprise.For example: the voltage for the external power source that provides to power interface circuit 1 is 9V, before externally power supply enters power interface circuit, will carry out the power supply that rectifying and wave-filtering and voltage stabilizing adjustment are exported 9V voltage to external power source.
When the external power source access is arranged, can realize the talking pen cycle charging that the present embodiment is provided, the replacing trouble of having avoided using the waste of the common batteries that does not there is charge function and having brought.
The second that Fig. 2 shows the talking pen that the utility model embodiment provides forms structure, for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows.
As the utility model one embodiment, in order effectively to protect the normal operation of rechargeable battery 3 and talking pen, in order to improve the driving force of radiating circuit 4, described talking pen also comprises:
Connect described rechargeable battery 3 and described radiating circuit 4, the booster circuit 6 that the voltage that described rechargeable battery 3 is exported is boosted and processes;
Connect described charging circuit 2, described booster circuit 6 and described radiating circuit 4, detect the voltage of described rechargeable battery 3, during lower than predetermined voltage threshold, control the out-of-work low-voltage testing circuit 5 of described booster circuit 6 and described radiating circuit 4 at the voltage of described rechargeable battery 3.
After increasing booster circuit 6, improved the transmitting power of the radiating circuit 4 of talking pen, also can realize the transmitting power of radiating circuit 4 is adjusted.
After increasing low-voltage testing circuit 5, when rechargeable battery 3 is not enough to drive talking pen work (especially being not enough to drive radiating circuit 4 and booster circuit 6 work), stop booster circuit 6 and radiating circuit 4 work; Thereby, effectively rechargeable battery 3 and talking pen are protected.
Fig. 3 show talking pen that the utility model embodiment provides the third form structure, for convenience of explanation, only show the part relevant to the utility model embodiment, details are as follows.
As the utility model one embodiment, in order to allow further talking pen have more hommization, charging circuit 2 and radiating circuit 4 to be monitored in real time, described talking pen also comprises:
Connect described charging circuit 2 and described radiating circuit 4, show the indicating circuit 8 of the operating state of the operating state of described charging circuit 2 and/or described radiating circuit 4.
Like this, indicating circuit 8 such as can allow the user grasp at any time whether to have charged, whether battery is full of at the situation, and the operating state of talking pen is controlled in real time.
Fig. 4 shows the 4th kind of talking pen that the utility model embodiment provides and forms structure, for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows.
As the utility model one embodiment, due to the voltage of the power interface circuit 1 output charging voltage coupling required with rechargeable battery 3 not necessarily; Especially for the overtension of the Voltage-output that prevents power interface circuit 1 output, damage rechargeable battery 3, described talking pen also comprises:
Connect described power interface circuit 1 and described charging circuit 2, the first power supply that described power interface circuit 1 is exported carries out the step-down processing, and the first power supply after step-down is exported to the reduction voltage circuit 7 of described charging circuit 2.
By reduction voltage circuit 7, output and the charging voltage that rechargeable battery 3 mates, protected rechargeable battery 3 effectively; Meanwhile, provide the fit of external power source and rechargeable battery 3, be about to the voltage of external power source by the charging voltage of power interface circuit 1, reduction voltage circuit 7 and charging circuit 2 outputs and rechargeable battery 3 couplings.
Fig. 5 shows the 4th kind of physical circuit that forms structure of the talking pen that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows.
Preferably, described charging circuit 2 comprises:
Charging chip U5, filter capacitor C28, filter capacitor C29, divider resistance R19, divider resistance R20, P type metal-oxide-semiconductor Q1, Schottky diode D3, divider resistance R25, divider resistance R26, divider resistance R23, divider resistance R24, filter capacitor C35, filter capacitor C36 and filter capacitor C22;
The first end of described filter capacitor C28 and the second end connect respectively described reduction voltage circuit 7 and ground, the first end of described filter capacitor C29 and the second end connect respectively first end and the ground of described filter capacitor C28, the power pins VDD of described charging chip U5 and ground pin GND connect respectively first end and the second end of described filter capacitor C29, the drain electrode of described P type metal-oxide-semiconductor Q1, grid and source electrode connect respectively the anode of described Schottky diode D3, the second end of the first end of described divider resistance R19 and described divider resistance R19, described divider resistance R20 is connected to the pwm signal of described charging chip U5 of the second end of described divider resistance R19 and controls between pin PWM, the first end of described divider resistance R26 and the second end meet respectively the negative electrode of described Schottky diode D3 and the voltage sample pin PB of described charging chip U5, after described filter capacitor C36 and described divider resistance R25 parallel connection, be connected between the second end and ground of described divider resistance R26, described filter capacitor C35 is connected between the first end and ground of described divider resistance R26, the demonstration pin PD of described charging chip U5 connects described indicating circuit 8, the first end of described filter capacitor C22 and the second end connect respectively low-voltage output pin PA and the ground of described charging chip U5, the first end of described divider resistance R23 and the second end connect respectively the first end of described filter capacitor C22 and the first end of described divider resistance R24, the second end ground connection of described divider resistance R24, the first end of the first end of described divider resistance R26 and described divider resistance R24 connects respectively positive pole and the negative pole of described rechargeable battery 3.
It should be noted that the first termination power pins VCC2 of described filter capacitor C28.
Preferably, described reduction voltage circuit 7 comprises:
Step-down chip U3, filter capacitor C24, load resistance R15, matching capacitance C25, inductance L 1, divider resistance R16, divider resistance R14, divider resistance R18, filter capacitor C30, filter capacitor C31, filter capacitor C26 and filter capacitor C27;
The input pin IN of described step-down chip U3 and enable pin EN connect respectively described power interface circuit 1, described filter capacitor C24 is connected between the power filter pin VCC and ground of described step-down chip U3, described load resistance R15 is connected to the voltage of described step-down chip U3 and adjusts between pin AAM and ground, the ground pin GND ground connection of described step-down chip U3, the first end of described matching capacitance C25 and the second end meet respectively external capacitive pin BST and the switch pin SW of described step-down chip U3, the first end of described divider resistance R16 and the second end connect respectively the feedback sample pin FB of described step-down chip U3 and the first end of described divider resistance R18, the second end ground connection of described R18, the second end of the described matching capacitance C25 of the first termination of described inductance L 1, after described divider resistance R14 and described filter capacitor C30 parallel connection, be connected between the first end of the second end of described inductance L 1 and described divider resistance R18, described filter capacitor C31, after filter capacitor C26 and filter capacitor C27 parallel connection, be connected between second end and ground of described inductance L 1, the first end of the described filter capacitor C28 of the second termination of described inductance L 1,
Preferably, described power interface circuit 1 comprises:
ESD pipe D4, filter capacitor C12, discharge resistance R17, current-limiting resistance R13, Schottky diode D5, filter capacitor C21, filter capacitor C20, filter capacitor C33 and filter capacitor C23;
The first end of described ESD pipe D4 and the power pins VCC1 that the second end connects respectively described external power source and ground pin GND, after described filter capacitor C12 and discharge resistance R17 parallel connection, be connected between the first end and ground of described ESD pipe D4, the first end of described current-limiting resistance R13 and the second end connect respectively between the enable pin EN of the first end of described ESD pipe D4 and described step-down chip U3, the anode of described Schottky diode D5 connects the first end of described current-limiting resistance R13, described filter capacitor C21, filter capacitor C20, after filter capacitor C33 and filter capacitor C23 parallel connection, be connected between the negative electrode and ground of described Schottky diode D5, the negative electrode of described Schottky diode D5 meets the input pin IN of described step-down chip U3.
It should be noted that the second termination power pin VCC2 of described inductance L 1.
Preferably, described low-voltage detection circuit comprises:
Low-voltage detection chip U1 and pull-up resistor R3;
The input pin VDD of described low-voltage detection chip U1, output pin OUT and ground pin VSS connect respectively positive pole, described radiating circuit 4 and the ground of described rechargeable battery 3, and described pull-up resistor R3 is connected between the input pin VDD and output pin OUT of described low-voltage detection chip U1.
Preferably, described radiating circuit 4 comprises:
Described switching circuit 41 connects respectively the output pin OUT of described low-voltage detection chip U1 and the grid of N-type metal-oxide-semiconductor Q2, described filter capacitor C17 is connected between the grid and ground of described N-type metal-oxide-semiconductor Q2, the drain electrode of described N-type metal-oxide-semiconductor Q2 and source electrode connect respectively the second end and the ground of described divider resistance R12, the first end of described divider resistance R10 and the second end connect respectively the base stage of first end and the described NPN type triode Q4 of described resonant capacitance C1, the first end of described resonant capacitance C7 and the second end connect respectively the second end of described divider resistance R10 and the second end of described divider resistance R12, described divider resistance R11 is connected between the first end of the emitter of described NPN type triode Q4 and described divider resistance R12, the collector electrode of described NPN type triode Q4 connects the second end of described resonant capacitance C1, described resonant capacitance C4 and resonance capacitor C 18 are all in parallel with described resonant capacitance C1, the first end of described resonant capacitance C9 and the second end connect respectively the second end of described resonant capacitance C1 and the first end of described divider resistance R12, described resonant capacitance C8 is in parallel with described divider resistance R12, the second end of the first end of described divider resistance R10 and described divider resistance R12 connects respectively described booster circuit 6, described resonant capacitance C1 is in parallel with the inductance coil of antenna,
Preferably, the switching circuit 41 in described radiating circuit 4 comprises:
Normal open switch and current-limiting resistance R27;
The first end of described normal open switch and the second end connect respectively the output pin OUT of described low-voltage detection chip U1 and the grid of N-type metal-oxide-semiconductor Q2, and the first end of described current-limiting resistance R27 and the second end connect respectively the second end and the ground of described normal open switch;
Perhaps, the switching circuit 41 in described radiating circuit 4 comprises:
Normally closed switch;
The first end of described normally closed switch connects respectively the output pin OUT of described low-voltage detection chip U1 and the grid of N-type metal-oxide-semiconductor Q2, the second end ground connection of described normally closed switch;
Preferably, described booster circuit 6 comprises:
Chip U2, filter capacitor C2, filter capacitor C3, inductance L 2, current-limiting resistance R8, Schottky diode D1, filter capacitor C5, divider resistance R5, divider resistance R6 and filter capacitor C6 boost;
The first end of described inductance L 2 and the second end connect respectively the positive pole of described rechargeable battery 3 and the anode of described Schottky diode D1, described filter capacitor C2 is connected between the first end and ground of described inductance L 2, described filter capacitor C3 is connected between the power pins VDD and ground of the described chip U2 that boosts, the first end of described current-limiting resistance R8 and the second end meet respectively the second end of described inductance L 2 and the control pin CONT of the described chip U2 that boosts, after described filter capacitor C5 and described divider resistance R5 parallel connection, be connected between the output pin VOUT of the negative electrode of described Schottky diode D1 and the described chip U2 that boosts, the ground pin VSS of the described chip U2 that boosts connects the drain electrode of described N-type metal-oxide-semiconductor Q2, described divider resistance R6 is connected between the drain electrode of the output pin VOUT of the described chip U2 that boosts and described N-type metal-oxide-semiconductor Q2, the described feedback pin NC that boosts chip U2 connects the power pins VDD of the described chip U2 that boosts and the negative electrode of described Schottky diode D1, described filter capacitor C6 is connected between the negative electrode and ground of described Schottky diode D1, the negative electrode of described Schottky diode D1 connects the first end of described divider resistance R10.
It should be noted that, described switching circuit 41 can adopt any existing switch realization that can realize switching function.
It should be noted that, the drain electrode of described N-type metal-oxide-semiconductor Q2 meets signal ground S_GND.The first end of described resonant capacitance C1 and the second end meet respectively inductance pin LI+, inductance pin LI-, the inductance coil of described inductance pin LI+, inductance pin LI-external antenna.Inductance coil by this antenna produces the signal of required frequency to send to the reading main frame.
More optimizedly, in order to adjust the frequency of the radiofrequency signal that radiating circuit 4 sends, described radiating circuit 4 also comprises:
Resonant capacitance C10, resonant capacitance C11, resonant capacitance C13, resonant capacitance C14, resonant capacitance C15, resonant capacitance C16 and resonant capacitance C19;
Described resonant capacitance C10 and/or described resonant capacitance C11 and/or described resonant capacitance C13 and/or described resonant capacitance C14 and/or described resonant capacitance C15 and/or described resonant capacitance C16 and/or described resonant capacitance C19 are in parallel with described resonant capacitance C1 respectively.
Like this, by the people, be that one of them resonant capacitance in selective resonance capacitor C 10, resonant capacitance C11, resonant capacitance C13, resonant capacitance C14, resonant capacitance C15, resonant capacitance C16 and resonant capacitance C19 inserts or whether the combination of a plurality of resonant capacitances inserts radiating circuit 4, to adjust the frequency of the signal that radiating circuit 4 sends.
It should be noted that, adopt metal-oxide-semiconductor than adopting triode to realize turn-off function, guarantee that input resistance is large, conducting resistance is little, leakage current is little and noise is little.
Preferably, described indicating circuit 8 comprises:
Current-limiting resistance R21, current-limiting resistance R22 and comprise the first luminous tube and the light-emitting diode D2 of the second luminous tube;
The first end of described current-limiting resistance R21 and the second end connect respectively the demonstration pin PD of described charging chip U5 and the anode of the first luminous tube in described light-emitting diode D2, the minus earth of the first luminous tube in described light-emitting diode D2, the first end of described current-limiting resistance R22 and the second end connect respectively the anode of the second luminous tube in power supply VCC3 and described light-emitting diode D2, and the negative electrode of the second luminous tube in described light-emitting diode D2 connects the drain electrode of described N-type metal-oxide-semiconductor Q2.
When radiating circuit is worked, the second luminous tube in light-emitting diode D2 is lighted.
When charging circuit work, and during the rechargeable battery underfill, the demonstration pin PD output pwm signal of charging chip U5, glittering with the first luminous tube of controlling in light-emitting diode D2; When charging circuit work, and rechargeable battery is while being full of, and the demonstration pin PD of charging chip U5 output high level signal is lighted with the first luminous tube of controlling in light-emitting diode D2 always.
Thereby the user, according to the illuminating state of two luminous tubes in light-emitting diode D2, can judge the charge condition of battery, the working condition of radiating circuit.
Talking pen based on above-mentioned, the utility model also provides a kind of point reader, and described point reader comprises above-mentioned talking pen.
Below in conjunction with Fig. 5, the operation principle of the talking pen that the present embodiment provides is described:
During rechargeable battery 3 charging, the voltage that adopts ESD pipe D4 to provide external power source carries out voltage adjustment and voltage stabilizing, when the enable pin EN of step-down chip U3 detects the access of external power source through current-limiting resistance R13, and step-down chip U3 work; Reduction voltage circuit 7 carries out voltage adjustment (the pwm signal control pin output control signal of charging chip U5 by the voltage of power pins VCC2 output through overcharge circuit 2, this control signal is through divider resistance R20, to control the conducting of P type metal-oxide-semiconductor Q1, realize the voltage adjustment) after, charging circuit 2 outputs and the charging voltage that rechargeable battery 3 mates, realize rechargeable battery 3 is carried out to safe charging; Meanwhile, the voltage sample pin PB real-time sampling charging voltage of charging chip U5, control pin output control signal to adjust voltage by pwm signal in real time, to keep the charging voltage of charging circuit output and rechargeable battery coupling.
When the user need to use the talking pen transmitted signal, 41 conductings of user's control switch circuit, the voltage that rechargeable battery 3 provides is after the chip that boosts boosts, drive oscillating circuit in radiating circuit 4 (oscillating circuit is comprised of the inductance coil of divider resistance R10, divider resistance R11, divider resistance R12, resonant capacitance C7, resonant capacitance C8, resonant capacitance C9, resonant capacitance C1, resonant capacitance C4, resonant capacitance C18, NPN type triode Q4 and antenna) to produce radiofrequency signal, this radiofrequency signal is the signal that the user uses the talking pen transmission.More optimizedly, by controlling whether resonant capacitance C10, resonant capacitance C11, resonant capacitance C13, resonant capacitance C14, resonant capacitance C15, resonant capacitance C16 and resonant capacitance C19 are inserted to oscillating circuit, realize the adjustment to the frequency of radiofrequency signal.
More optimizedly, when using the talking pen transmitted signal, by low-voltage detection chip U1, the voltage of rechargeable battery 3 is detected in real time, if the brownout of rechargeable battery 3, the output pin OUT output low level of low-voltage detection chip U1, N-type metal-oxide-semiconductor Q2 cut-off, the emitter of the ground pin VSS of the chip U2 that boosts and NPN type triode Q4 is in high impedance status, the chip U2 that boosts quits work and NPN type triode Q4 cut-off, thereby realizes stopping booster circuit 6 and oscillating circuit work; If the voltage of rechargeable battery 3 is enough to keep booster circuit 6 and radiating circuit 4 normal operations, the output pin OUT output high level of low-voltage detection chip U1, N-type metal-oxide-semiconductor Q2 conducting, boost the ground pin VSS of chip U2 in low level, the emitter conducting of NPN type triode Q4, thereby, booster circuit 6 and radiating circuit 4 normal operations.
The foregoing is only better embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (10)
1. a talking pen, described talking pen comprise to input power carry out voltage regulation filtering process after the power interface circuit of output the first power supply, the external external power source of described power interface circuit, described talking pen also comprises to the radiating circuit of reading main frame transmitted signal; It is characterized in that, described talking pen also comprises:
The rechargeable battery that connects described radiating circuit;
Connect described power interface circuit and described rechargeable battery, receive the first power supply of described power interface circuit output, adopt the charging circuit of described the first power supply to described rechargeable battery charging.
2. talking pen as claimed in claim 1, is characterized in that, described talking pen also comprises:
Connect described rechargeable battery and described radiating circuit, the booster circuit that the voltage that described rechargeable battery is exported is boosted and processes;
Connect described charging circuit, described booster circuit and described radiating circuit, detect the voltage of described rechargeable battery, during lower than predetermined voltage threshold, control described booster circuit and the out-of-work low-voltage testing circuit of described radiating circuit at the voltage of described rechargeable battery.
3. talking pen as claimed in claim 2, is characterized in that, described talking pen also comprises:
Connect described charging circuit and described radiating circuit, show the indicating circuit of the operating state of the operating state of described charging circuit and/or described radiating circuit.
4. talking pen as claimed in claim 3, described talking pen also comprises:
Connect described power interface circuit and described charging circuit, the first power supply that described power interface circuit is exported carries out the step-down processing, and the first power supply after step-down is exported to the reduction voltage circuit of described charging circuit.
5. talking pen as claimed in claim 4, is characterized in that, described charging circuit comprises:
Charging chip U5, filter capacitor C28, filter capacitor C29, divider resistance R19, divider resistance R20, P type metal-oxide-semiconductor Q1, Schottky diode D3, divider resistance R25, divider resistance R26, divider resistance R23, divider resistance R24, filter capacitor C35, filter capacitor C36 and filter capacitor C22;
The first end of described filter capacitor C28 and the second end connect respectively described reduction voltage circuit and ground, the first end of described filter capacitor C29 and the second end connect respectively first end and the ground of described filter capacitor C28, the power pins of described charging chip U5 and ground pin connect respectively first end and the second end of described filter capacitor C29, the drain electrode of described P type metal-oxide-semiconductor Q1, grid and source electrode connect respectively the anode of described Schottky diode D3, the second end of the first end of described divider resistance R19 and described divider resistance R19, described divider resistance R20 is connected to the pwm signal of described charging chip U5 of the second end of described divider resistance R19 and controls between pin, the first end of described divider resistance R26 and the second end connect respectively the negative electrode of described Schottky diode D3 and the voltage sample pin of described charging chip U5, after described filter capacitor C36 and described divider resistance R25 parallel connection, be connected between the second end and ground of described divider resistance R26, described filter capacitor C35 is connected between the first end and ground of described divider resistance R26, the demonstration pin of described charging chip U5 connects described indicating circuit, the first end of described filter capacitor C22 and the second end connect respectively low-voltage output pin and the ground of described charging chip U5, the first end of described divider resistance R23 and the second end connect respectively the first end of described filter capacitor C22 and the first end of described divider resistance R24, the second end ground connection of described divider resistance R24, the first end of the first end of described divider resistance R26 and described divider resistance R24 connects respectively positive pole and the negative pole of described rechargeable battery.
6. talking pen as claimed in claim 5, is characterized in that, described reduction voltage circuit comprises:
Step-down chip U3, filter capacitor C24, load resistance R15, matching capacitance C25, inductance L 1, divider resistance R16, divider resistance R14, divider resistance R18, filter capacitor C30, filter capacitor C31, filter capacitor C26 and filter capacitor C27;
Input pin and the enable pin of described step-down chip U3 connect respectively described power interface circuit, described filter capacitor C24 is connected between the power filter pin and ground of described step-down chip U3, described load resistance R15 is connected to the voltage of described step-down chip U3 and adjusts between pin and ground, the ground pin ground connection of described step-down chip U3, the first end of described matching capacitance C25 and the second end connect respectively external capacitive pin and the switch pin of described step-down chip U3, the first end of described divider resistance R16 and the second end connect respectively the feedback sample pin of described step-down chip U3 and the first end of described divider resistance R18, the second end ground connection of described R18, the second end of the described matching capacitance C25 of the first termination of described inductance L 1, after described divider resistance R14 and described filter capacitor C30 parallel connection, be connected between the first end of the second end of described inductance L 1 and described divider resistance R18, described filter capacitor C31, after filter capacitor C26 and filter capacitor C27 parallel connection, be connected between second end and ground of described inductance L 1, the first end of the described filter capacitor C28 of the second termination of described inductance L 1,
Described power interface circuit comprises:
ESD pipe D4, filter capacitor C12, discharge resistance R17, current-limiting resistance R13, Schottky diode D5, filter capacitor C21, filter capacitor C20, filter capacitor C33 and filter capacitor C23;
The first end of described ESD pipe D4 and the power pins (VCC1) that the second end connects respectively described external power source and ground pin, after described filter capacitor C12 and discharge resistance R17 parallel connection, be connected between the first end and ground of described ESD pipe D4, the first end of described current-limiting resistance R13 and the second end connect respectively between the enable pin of the first end of described ESD pipe D4 and described step-down chip U3, the anode of described Schottky diode D5 connects the first end of described current-limiting resistance R13, described filter capacitor C21, filter capacitor C20, after filter capacitor C33 and filter capacitor C23 parallel connection, be connected between the negative electrode and ground of described Schottky diode D5, the negative electrode of described Schottky diode D5 connects the input pin of described step-down chip U3.
7. talking pen as claimed in claim 6, is characterized in that, described low-voltage detection circuit comprises:
Low-voltage detection chip U1 and pull-up resistor R3;
The input pin of described low-voltage detection chip U1, output pin and ground pin connect respectively the positive pole of described rechargeable battery, described radiating circuit and ground, and described pull-up resistor R3 is connected between the input pin and output pin of described low-voltage detection chip U1.
8. talking pen as claimed in claim 7, is characterized in that, described radiating circuit comprises:
Switching circuit, filter capacitor C17, N-type metal-oxide-semiconductor Q2, divider resistance R10, divider resistance R11, divider resistance R12, resonant capacitance C7, resonant capacitance C8, resonant capacitance C9, resonant capacitance C1, resonant capacitance C4, resonant capacitance C18 and NPN type triode Q4;
Described switching circuit connects respectively the output pin of described low-voltage detection chip U1 and the grid of N-type metal-oxide-semiconductor Q2, described filter capacitor C17 is connected between the grid and ground of described N-type metal-oxide-semiconductor Q2, the drain electrode of described N-type metal-oxide-semiconductor Q2 and source electrode connect respectively the second end and the ground of described divider resistance R12, the first end of described divider resistance R10 and the second end connect respectively the base stage of first end and the described NPN type triode Q4 of described resonant capacitance C1, the first end of described resonant capacitance C7 and the second end connect respectively the second end of described divider resistance R10 and the second end of described divider resistance R12, described divider resistance R11 is connected between the first end of the emitter of described NPN type triode Q4 and described divider resistance R12, the collector electrode of described NPN type triode Q4 connects the second end of described resonant capacitance C1, described resonant capacitance C4 and resonance capacitor C 18 are all in parallel with described resonant capacitance C1, the first end of described resonant capacitance C9 and the second end connect respectively the second end of described resonant capacitance C1 and the first end of described divider resistance R12, described resonant capacitance C8 is in parallel with described divider resistance R12, the second end of the first end of described divider resistance R10 and described divider resistance R12 connects respectively described booster circuit, described resonant capacitance C1 is in parallel with the inductance coil of antenna,
Switching circuit in described radiating circuit comprises:
Normal open switch and current-limiting resistance R27;
The first end of described normal open switch and the second end connect respectively the output pin of described low-voltage detection chip U1 and the grid of N-type metal-oxide-semiconductor Q2, and the first end of described current-limiting resistance R27 and the second end connect respectively the second end and the ground of described normal open switch;
Perhaps, the switching circuit in described radiating circuit comprises:
Normally closed switch;
The first end of described normally closed switch connects respectively the output pin of described low-voltage detection chip U1 and the grid of N-type metal-oxide-semiconductor Q2, the second end ground connection of described normally closed switch;
Described booster circuit comprises:
Chip U2, filter capacitor C2, filter capacitor C3, inductance L 2, current-limiting resistance R8, Schottky diode D1, filter capacitor C5, divider resistance R5, divider resistance R6 and filter capacitor C6 boost;
The first end of described inductance L 2 and the second end connect respectively the positive pole of described rechargeable battery and the anode of described Schottky diode D1, described filter capacitor C2 is connected between the first end and ground of described inductance L 2, described filter capacitor C3 is connected between the power pins and ground of the described chip U2 that boosts, the first end of described current-limiting resistance R8 and the second end connect respectively the second end of described inductance L 2 and the control pin of the described chip U2 that boosts, after described filter capacitor C5 and described divider resistance R5 parallel connection, be connected between the output pin of the negative electrode of described Schottky diode D1 and the described chip U2 that boosts, the ground pin of the described chip U2 that boosts connects the drain electrode of described N-type metal-oxide-semiconductor Q2, described divider resistance R6 is connected between the drain electrode of the output pin of the described chip U2 that boosts and described N-type metal-oxide-semiconductor Q2, described feedback pin of boosting chip U2 connects the power pins of the described chip U2 that boosts and the negative electrode of described Schottky diode D1, described filter capacitor C6 is connected between the negative electrode and ground of described Schottky diode D1, the negative electrode of described Schottky diode D1 connects the first end of described divider resistance R10,
Described indicating circuit comprises:
Current-limiting resistance R21, current-limiting resistance R22 and comprise the first luminous tube and the light-emitting diode D2 of the second luminous tube;
The first end of described current-limiting resistance R21 and the second end connect respectively the demonstration pin of described charging chip U5 and the anode of the first luminous tube in described light-emitting diode D2, the minus earth of the first luminous tube in described light-emitting diode D2, the first end of described current-limiting resistance R22 and the second end connect respectively the anode of the second luminous tube in power supply (VCC3) and described light-emitting diode D2, and the negative electrode of the second luminous tube in described light-emitting diode D2 connects the drain electrode of described N-type metal-oxide-semiconductor Q2.
9. talking pen as claimed in claim 8, is characterized in that, described radiating circuit also comprises:
Resonant capacitance C10, resonant capacitance C11, resonant capacitance C13, resonant capacitance C14, resonant capacitance C15, resonant capacitance C16 and resonant capacitance C19;
Described resonant capacitance C10 and/or described resonant capacitance C11 and/or described resonant capacitance C13 and/or described resonant capacitance C14 and/or described resonant capacitance C15 and/or described resonant capacitance C16 and/or described resonant capacitance C19 are in parallel with described resonant capacitance C1 respectively.
10. a point reader, is characterized in that, described point reader comprises that claim 1 is to the described talking pen of claim 9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320372678.3U CN203387216U (en) | 2013-06-26 | 2013-06-26 | Point-reading pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320372678.3U CN203387216U (en) | 2013-06-26 | 2013-06-26 | Point-reading pen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203387216U true CN203387216U (en) | 2014-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320372678.3U Expired - Fee Related CN203387216U (en) | 2013-06-26 | 2013-06-26 | Point-reading pen |
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| CN (1) | CN203387216U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108027671A (en) * | 2015-09-18 | 2018-05-11 | 微软技术许可有限责任公司 | Booster circuit for stylus |
-
2013
- 2013-06-26 CN CN201320372678.3U patent/CN203387216U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108027671A (en) * | 2015-09-18 | 2018-05-11 | 微软技术许可有限责任公司 | Booster circuit for stylus |
| CN108027671B (en) * | 2015-09-18 | 2021-05-25 | 微软技术许可有限责任公司 | Voltage boosting circuit for touch control pen |
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Granted publication date: 20140108 Termination date: 20160626 |