CN202711183U - Electromagnetic pen - Google Patents
Electromagnetic pen Download PDFInfo
- Publication number
- CN202711183U CN202711183U CN 201220286047 CN201220286047U CN202711183U CN 202711183 U CN202711183 U CN 202711183U CN 201220286047 CN201220286047 CN 201220286047 CN 201220286047 U CN201220286047 U CN 201220286047U CN 202711183 U CN202711183 U CN 202711183U
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Abstract
The utility model provides an electromagnetic pen which comprises a battery, a booster circuit, a microprogrammed control unit (MCU), an amplification bias circuit, a first key SW1, a second key SW2 and a third key SW3, wherein the battery is connected with the booster circuit, the booster circuit is connected with the MCU, a pulse outlet of the MCU is connected with the amplification bias circuit, the first key SW1, the second key SW2 and the third key SW3 are all connected to the MCU, and the third key SW3 is further connected to the booster circuit. By means of the adoption of the MCU with a relatively small size, pulses with different frequency are outputted, outputting frequency is stable, and complexity of an external circuit is reduced, and failure rate and cost are reduced; by means of pressing of the first key or the second key, the circuits can be in a sleep mode, power consumption is reduced, usage time is prolonged, and by means of switch-on or switch-off of a resistor R3, eight types of pulses with different frequency can be outputted.
Description
[technical field]
The utility model relates to a kind of time writer for electromagnetic electronic white board.
[background technology]
The existing time writer of electromagnetic electronic white board that is used for is by the pulse of RC oscillatory circuit or LC pierce circuit output different frequency, the frequency temperature influence of its output is large, unstable, and this just causes the time writer output frequency to depart from when larger, write not word occurrence, impact is normally used.Simultaneously, existing time writer also has the following disadvantages: 1) circuit is complicated, and cost is high and easily break down; 2) power consumption is large, and service time is short.
[summary of the invention]
The technical problems to be solved in the utility model is to provide a kind of time writer, and it is low in energy consumption, service time is long, circuit structure is simple, cost is low, exportable eight kinds of different frequencies and output frequency stable, and result of use is good.
The utility model is achieved in that
A kind of time writer, comprise that a battery, a booster circuit, a MCU, amplify biasing circuit, one first button SW1, one second button SW2 and one the 3rd button SW3, described battery connects described booster circuit, described booster circuit connects MCU, the pulse delivery outlet of described MCU connects described amplification biasing circuit, described the first button SW1, the second button SW2 and the 3rd button SW3 all are connected to described MCU, and described the 3rd button SW3 also is connected to described booster circuit.
Further, described time writer also comprises a USB battery charger, and it connects described battery.
Further, P 3.4 ports of described MCU are by described the first button SW1 ground connection, the P3.3 port of described MCU is by described the second button SW2 ground connection, the P3.5 port of described MCU is the pulse delivery outlet, the P3.1 port of described MCU connects described the 3rd button SW3 by a resistance R 2, and the P3.1 port of described MCU is also by a resistance R 1 ground connection.
Further, described booster circuit comprises a diode D1, boost chip and a resistance R 5 and a battery C6 parallel with one another, described resistance R 5 and capacitor C 6 form the RC charging circuit, the described chip that boosts connects the negative pole of described diode D1, the positive pole of described diode D1 is connected between described resistance R 2 and described the 3rd button SW3, and the described chip that boosts is also by described resistance R parallel with one another 5 and battery C6 ground connection.
Further, the P3.0 port of described MCU is by a resistance R 3 ground connection.
Further, the described chip that boosts is the PT1301 chip, and the CE end of described PT1301 chip connects the negative pole of described diode D1, and the CE end of described PT1301 chip is also by described resistance R parallel with one another 5 and capacitor C 6 ground connection.
The utility model has the advantage of: export the pulse of different frequency by the MCU that adopts small volume, output frequency is stable, and circuit structure is simple, reduce trouble and cost; By pressing the first button or the second button makes circuit enter sleep pattern, reduce power consumption, extend working time, by access or connecting resistance R3 not, export eight kinds of pulses that frequency is different.
[description of drawings]
In conjunction with the embodiments the utility model is further described with reference to the accompanying drawings.
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the P3.0 port structural representation during connecting resistance not of the utility model MCU.
Structural representation when Fig. 3 is the P3.0 port connecting resistance R3 of the utility model MCU.
[embodiment]
See also Fig. 1 to shown in Figure 3, embodiment of the present utility model is described in detail
A kind of time writer, comprise a battery 1, one booster circuit 2, one MCU, one amplifies biasing circuit 3, one first button SW1, one second button SW2, one the 3rd button SW3 and a USB battery charger 4, described battery 1 connects described booster circuit 2, described booster circuit 2 connects MCU, the pulse delivery outlet of described MCU connects described amplification biasing circuit 3, described the first button SW1, the second button SW2 and the 3rd button SW3 all are connected to described MCU, described the 3rd button SW3 also is connected to described booster circuit 2, and described USB battery charger 4 connects described battery 1.Described battery is the 1.5V battery.Described amplification biasing circuit 3 is realized voltage bias by mimic channel, launches the higher electromagnetic wave of intensity, on blank need not signal put very large, reduce interference source.
Particularly, described booster circuit 2 comprises a diode D1, boost chip 5 and a resistance R 5 and a battery C6 parallel with one another, and described resistance R 5 and capacitor C 6 form the RC charging circuits.In the present embodiment, the described chip that boosts is the PT1301 chip.The CE end of described PT1301 chip connects the negative pole of described diode D1, and the positive pole of described diode D1 is connected between described resistance R 2 and described the 3rd button SW3, and the CE of described PT1301 chip holds also by described resistance R parallel with one another 5 and battery C6 ground connection.By described booster circuit, after the low-voltage of 1.5V is boosted, sustainable 30 seconds.
The P3.4 port of described MCU is by described the first button SW1 ground connection, the P3.3 port of described MCU is by described the second button SW2 ground connection, the P3.5 port of described MCU is the pulse delivery outlet, the P3.1 port of described MCU connects described the 3rd button SW3 by a resistance R 2, also by a resistance R 1 ground connection, described resistance R 1 is for letting out resistance for the P3.1 port of described MCU.Export the pulse of different frequency by the MCU of small volume.The RC oscillatory circuit that such frequency ratio is general, the LC oscillatory circuit is stable.Export multiple different frequency by the first button SW1, the second button SW2 and three buttons of the 3rd button SW3, easily control and switch the different conditions of pen, and reduce the complicacy of external circuit, Cost reduction.
By pressing the first button SW1 or the second button SW2 makes circuit enter sleep pattern, reduce the power consumption of time writer.The P3.0 of MCU or P3.1 port are the function of multiplexing IO, and IO both can be used to do program and downloaded, and also can be used to do common IO mouth and use.
Use that time writer is defeated to be pressed the 3rd button SW3 circuit is boosted when writing, draw high simultaneously the level of P3.5 port, output waveform.When the 3rd button SW3 button is late for, by the external resistance R 1 of letting out, change rapidly the frequency output size when pressing, and the electric energy in the RC charging circuit of maintenance resistance R 5 and battery C6 composition, allow the electric energy in the RC charging circuit continue circuit supply, until energy stops.
See also Fig. 2 and Fig. 3, Fig. 2 is the direct ground connection of P3.0 port of MCU, the electrical schematic diagram when being pulled to low level, the pulse of its exportable four kinds of different frequencies.Fig. 3 is that the P3.0 port of MCU connects a resistance R 3, is the electrical schematic diagram of high level state, the pulse of its exportable other four kinds of different frequencies.The pulse theory of above-mentioned two states output different frequency is the same, and is existing to connect resistance R 3 as example, is specially:
At first, the P3.3 port of described MCU and the original state of P3.4 port all are to be defaulted as high level output.When the first button SW1 and the second button SW2 press, the P3.3 port of described MCU and P3.4 port ground connection, level is dragged down.The P3.5 port of described MCU is exported respectively two kinds of different frequencies.
Simultaneously, power supply charged to described PT1301 chip when the 3rd button SW3 pressed, and made DC voltage 1.5V rise to 5V;
Secondly, the original state of the P3.1 port of described MCU is low level, and then, the P3.1 port of described MCU was drawn to be high level, can export the pulse of the third frequency when for high level when the 3rd button SW3 pressed.When the 3rd button SW3 upspring, described resistance R 1 played discharge process, made the P3.1 port become rapidly low level again;
Then, when the 3rd button SW3 upspring, diode D1 had played pressure stabilization function, can not be discharged into ground to the electric energy in the CE end of PT1301 chip;
When three buttons are all upspring, can export the waveform of the 4th kind of frequency.
After removing resistance R 3, can also export the pulse of the other four kind frequencies different from above-mentioned four kinds of frequencies.
The utility model is exported the pulse of different frequency by the MCU that adopts small volume, output frequency is stable, and circuit structure is simple, reduce trouble and cost; By pressing the first button or the second button makes circuit enter sleep pattern, reduce power consumption, extend working time, by access or connecting resistance R3 not, export eight kinds of pulses that frequency is different.
The above, it only is the utility model preferred embodiment, therefore can not limit according to this scope that the utility model is implemented, the equivalence of namely doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model contains.
Claims (6)
1. time writer, it is characterized in that: comprise that a battery, a booster circuit, a MCU, amplify biasing circuit, one first button SW1, one second button SW2 and one the 3rd button SW3, described battery connects described booster circuit, described booster circuit connects MCU, the pulse delivery outlet of described MCU connects described amplification biasing circuit, described the first button SW1, the second button SW2 and the 3rd button SW3 all are connected to described MCU, and described the 3rd button SW3 also is connected to described booster circuit.
2. a kind of time writer according to claim 1, it is characterized in that: also comprise a USB battery charger, it connects described battery.
3. a kind of time writer according to claim 1 and 2, it is characterized in that: the P3.4 port of described MCU is by described the first button SW1 ground connection, the P3.3 port of described MCU is by described the second button SW2 ground connection, the P3.5 port of described MCU is the pulse delivery outlet, the P3.1 port of described MCU connects described the 3rd button SW3 by a resistance R 2, and the P3.1 port of described MCU is also by a resistance R 1 ground connection.
4. a kind of time writer according to claim 1 and 2, it is characterized in that: described booster circuit comprises a diode D1, boost chip and a resistance R 5 and a battery C6 parallel with one another, described resistance R 5 and capacitor C 6 form the RC charging circuit, the described chip that boosts connects the negative pole of described diode D1, the positive pole of described diode D1 is connected between described resistance R 2 and described the 3rd button SW3, and the described chip that boosts is also by described resistance R parallel with one another 5 and capacitor C 6 ground connection.
5. a kind of time writer according to claim 1 and 2 is characterized in that: the P3.0 port of described MCU is by a resistance R 3 ground connection.
6. a kind of time writer according to claim 4, it is characterized in that: the described chip that boosts is the PT1301 chip, the CE end of described PT1301 chip connects the negative pole of described diode D1, and the CE end of described PT1301 chip is also by described resistance R parallel with one another 5 and capacitor C 6 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220286047 CN202711183U (en) | 2012-06-15 | 2012-06-15 | Electromagnetic pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220286047 CN202711183U (en) | 2012-06-15 | 2012-06-15 | Electromagnetic pen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202711183U true CN202711183U (en) | 2013-01-30 |
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ID=47591465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220286047 Expired - Fee Related CN202711183U (en) | 2012-06-15 | 2012-06-15 | Electromagnetic pen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202711183U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104461664A (en) * | 2014-12-30 | 2015-03-25 | 深圳市辰卓科技有限公司 | Mcu starting mode selecting circuit |
| CN107438941A (en) * | 2017-04-07 | 2017-12-05 | 深圳市汇顶科技股份有限公司 | Active pen, booster circuit and its control method |
-
2012
- 2012-06-15 CN CN 201220286047 patent/CN202711183U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104461664A (en) * | 2014-12-30 | 2015-03-25 | 深圳市辰卓科技有限公司 | Mcu starting mode selecting circuit |
| CN104461664B (en) * | 2014-12-30 | 2018-04-27 | 深圳市辰卓科技有限公司 | MCU start-up mode selection circuits |
| CN107438941A (en) * | 2017-04-07 | 2017-12-05 | 深圳市汇顶科技股份有限公司 | Active pen, booster circuit and its control method |
| CN107438941B (en) * | 2017-04-07 | 2019-02-12 | 深圳市汇顶科技股份有限公司 | Active pen, booster circuit and its control method |
| US10261609B2 (en) | 2017-04-07 | 2019-04-16 | Shenzhen GOODIX Technology Co., Ltd. | Active stylus, boost circuit, and control method therefor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20160615 |