CN203563041U - One-key startup and shutdown device for intelligent electronic white board - Google Patents
One-key startup and shutdown device for intelligent electronic white board Download PDFInfo
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- CN203563041U CN203563041U CN201320699161.5U CN201320699161U CN203563041U CN 203563041 U CN203563041 U CN 203563041U CN 201320699161 U CN201320699161 U CN 201320699161U CN 203563041 U CN203563041 U CN 203563041U
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Abstract
The utility model relates to the automatic control field and concretely provides a one-key startup and shutdown device for an intelligent electronic white board. The one-key startup and shutdown device is mainly composed of a micro-motion stroke switch K, a mutual inductance transformer L, a phase sensitive rectification circuit, a wave stabilization circuit and a terminal control circuit. The normally-closed terminal and the normally-open terminal of the micro-motion stroke switch K are connected with the positive electrode and the negative electrode of a DC power source respectively. The common terminal of the micro-motion stroke switch K is connected with one end of the primary side of the mutual inductance transformer L, the other end of the primary side of the mutual inductance transformer L is in series connection with a capacitor C2 and then is connected with the normally-open terminal of the micro-motion stroke switch K, and the secondary side of the mutual inductance transformer L is connected with the terminal control circuit via the phase sensitive rectification circuit and the wave stabilization circuit. The terminal control circuit is in parallel connection with a microcomputer and a button switch of a liquid crystal display. Compared with the prior art, the one-key startup and shutdown device for an intelligent electronic white board has the characteristics of being convenient to use, low in energy consumption, enabling the service life of a display to be prolonged, etc.
Description
Technical field
The utility model relates to automation field, specifically provides intelligent electronic white board one key switch machine.
Background technology
Take microcomputer, be embedded in large scale liquid crystal display as showing the intelligent electronic white board of writing carrier, rich color, luminance contrast is high, can easily realize the content of courses, comprise annotations and comments and the modification of the teaching coursewares such as the picture of PPT, Word, Excel document and various forms, brought brand-new interactive mode teaching mode, can effectively promote teachers and students' interaction, enliven classroom atmosphere, improve the quality of teaching.Have failure rate is low, working service cost is low.Along with the progress of manufacturing technology progress and embedded technology, the main body large scale liquid crystal display cost of intelligent electronic white board is more and more lower, and intelligent electronic white board has been used to the various fields such as classroom instruction, training for industry, exchange of technology, amusement.
At present, the method for start-up and shutdown of desktop microsystem has been acted in intelligent electronic white board switching on and shutting down, i.e. main frame and display switch respectively.Because people for a long time use desktop microcomputer, formed the custom of a switch main frame, while using intelligent electronic white board, common switch main frame, is not related to display, and display is for a long time in holding state, causes reducing useful life, the problem such as waste electric energy occurs.
Summary of the invention
The utility model is for above-mentioned the deficiencies in the prior art, and a kind of intelligent electronic white board one key switch machine simple in structure, easy to use is provided.
The utility model solves the technical scheme that its technical problem adopts: intelligent electronic white board one key switch machine, mainly by micro limit switch K, inductance transformer L, phase-sensitive rectifier circuit, steady wave circuit and terminal control the electric circuit constitute, the normally closed terminals of micro limit switch K and Chang Kai terminals connect respectively positive pole and the negative pole of DC power supply, the common terminal of micro limit switch K connects the one end on the former limit of inductance transformer L, the other end on the former limit of inductance transformer L is connected on often opening on terminals of micro limit switch K after connecting with capacitor C 2, inductance transformer L secondary passes through phase-sensitive rectifier circuit, steady wave circuit connects terminal control circuit, the key switch of terminal control circuit and microcomputer and liquid crystal display also connects.
The bridge rectifier that described phase-sensitive rectifier circuit is preferably constituted by a diode.
The preferred resistance R of described steady wave circuit, capacitor C 3 form, and capacitor C 3 is connected in series with resistance R with phase-sensitive rectifier circuit and after connecting, then are connected with the key switch of microcomputer and liquid crystal display by terminal control circuit.
Described terminal control circuit is preferably electrical isolation device, as optical coupling integrated device TLP521-2 etc.
Described capacitor C 1 is power supply flat wave capacitor, is connected in parallel in power circuit, preferably big capacity electrolyte capacitor.
The micro limit switch K of an above-mentioned key switch machine is arranged on push-and-pull blackboard.The normally opened contact closure of micro limit switch K when blackboard is closed.When the normally opened contact of the moment micro limit switch K that blackboard is opened is opened, this control device can produce a standing wave signal, starts microcomputer, liquid crystal display.When the normally opened contact closure of the moment of blackboard closure micro limit switch, this control device can produce a standing wave signal again, closes microcomputer, liquid crystal display.Concrete operation principle is as follows:
When blackboard is closed, the normally opened contact of micro limit switch K is in closure state.
When the normally opened contact of the moment micro limit switch K that blackboard is opened is opened, normally-closed contact closure, the branch road that the former limit of inductance transformer L of connecting with capacitor C 2 forms is connected on power circuit, DC power supply is charged to capacitor C2 by the former limit of inductance transformer L, on the former limit of inductance transformer L, form a very large transient current, this electric current is when capacitor C2 both end voltage equates with supply voltage, i.e. capacitor C 2 chargings finish while finishing.The former limit of inductance transformer L transient current can produce an instantaneous mutual inductance electric current and voltage at inductance transformer secondary.Inductance transformer L secondary produces mutual inductance electric current and voltage, by the phase-sensitive rectifier circuit being comprised of 4 diodes, forms a direction consistent electric current and voltage all the time.This voltage by the flat ripple of steady wave circuit being formed by capacitor C 3 and resistance R after, drive terminal control circuit, make to open with microcomputer and liquid crystal display control channel moment, microcomputer and liquid crystal display start.Now, when blackboard is opened, the normally opened contact of micro limit switch is always in open mode, and normally-closed contact is always in closure state, and the terminal voltage that charging finishes rear capacitor equates with supply voltage, and in circuit, electric current is 0.
When normally opened contact closure, the normally-closed contact of the moment of blackboard closure micro limit switch K are opened, the branch road that the former limit of inductance transformer L of connecting with capacitor C 2 forms forms discharge loop by closed normally opened contact, capacitor C 2 devices discharge rapidly, on the former limit of inductance transformer L, form a very large instantaneous discharge electric current, this electric current is 0 o'clock in capacitor C2 both end voltage, when capacitor discharge finishes, finishes.The former limit of inductance transformer L instantaneous discharge electric current can produce an instantaneous mutual inductance electric current and voltage at inductance transformer secondary.Inductance transformer L secondary produces mutual inductance electric current and voltage, by phase-sensitive rectifier circuit, forms a direction consistent electric current and voltage all the time.This voltage, by after the flat ripple of steady wave circuit, drives terminal control circuit, makes to open with microcomputer and liquid crystal display control channel moment, and microcomputer and liquid crystal display are closed.Now, when blackboard is in closure state, the normally opened contact of micro limit switch K is always in closure state, normally-closed contact always in open mode circuit electric current be 0.
Compared to the prior art intelligent electronic white board one key switch machine of the present utility model, has following outstanding beneficial effect:
(1) closure by push-and-pull blackboard or opening action are controlled the switching of microcomputer and liquid crystal display simultaneously, easy to operate;
(2) only in switch moment, just consume electric energy, the energy waste of having avoided the long-time standby of liquid crystal display to cause, extends liquid crystal display useful life.
Accompanying drawing explanation
Accompanying drawing 1 is the circuit structure diagram of the utility model intelligent electronic white board one key switch machine.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as to restriction of the present utility model.
Provide a most preferred embodiment below:
As shown in Figure 1, the utility model intelligent electronic white board is comprised of micro limit switch K, inductance transformer L, phase-sensitive rectifier circuit A, steady wave circuit B, terminal control circuit E with a key switch machine.Wherein, the normally closed K2 of travel switch K and Chang Kai K3 terminals connect respectively positive pole and the negative pole of DC power supply.The common terminal K1 of the upper termination micro limit switch K of the former limit L1 of inductance transformer, the other end is connected on often opening on terminals K3 of micro limit switch K after connecting with capacitor C 2.Inductance transformer L secondary L2 is connected on the phase-sensitive rectifier circuit A being comprised of diode D1, D2, D3, D4.Phase-sensitive rectifier circuit A is connected and drives the terminal control circuit TK consisting of electrical isolation device with the steady wave circuit B of R, C3 composition.The output of terminal control circuit TK and microcomputer, key of liquid crystal display switch also connect.Micro limit switch K is arranged on push-and-pull blackboard, when blackboard is closed, and the normally opened contact K2 closure of micro limit switch K, normally-closed contact K3 opens.When the moment that blackboard is opened, the normally opened contact K3 of micro limit switch K opens, normally-closed contact K2 closure, and this control device can produce a standing wave signal, starts microcomputer, liquid crystal display.When the moment that blackboard is closed, the normally opened contact K3 closure of micro limit switch K, normally-closed contact K2 opens, and this control device can produce a standing wave signal again, closes microcomputer, liquid crystal display.
Its course of work is as follows:
When blackboard closure is not used intelligent electronic white board, the normally opened contact K2 closure of micro limit switch K, normally-closed contact K3 opens.The circuit closed that now the former limit L1 of inductance transformer, capacitor C 2 form, not with power supply UNICOM, the loop that the former limit L1 of inductance transformer, capacitor C 2 form does not have electric current to pass through, and inductance transformer secondary L2 is generation current (voltage) not, and terminal control circuit TK is in the closed condition of not working.
In the time will using intelligent electronic white board demonstration, need open blackboard.The moment that blackboard is opened, the normally opened contact K3 of micro limit switch K opens, normally-closed contact K2 closure, loop and power connection that now the former limit L1 of inductance transformer, capacitor C 2 form, power supply forms closed-loop path by normally-closed contact K2, common terminal K1, the former limit L1 of inductance transformer, capacitor C 2, charge to capacitor C 2, due to inductance transformer L employing is the common mode smoothing reactor of pc switching mode power supply, its number of turn is few, resistance is very little, now can form very large instantaneous charging current, instantaneous charging current continues to capacitor C 2 chargings and finishes.The instantaneous charging current of the former limit L1 of inductance transformer, can produce onesize electric current (voltage) at inductance transformer secondary L2.The transient current that inductance transformer secondary L2 produces, via the phase-sensitive rectifier circuit A rectification of diode D1, D2, D3, D4 composition, forms the constant direct current of direction, and charges to capacitor C 3.Resistance R one is to form steady wave circuit B with capacitor C 3, the 2nd, and the terminal control circuit TK current-limiting resistance that electrical isolation device forms.When capacitor C 3 is during higher than 0.7V, optical coupling integrated device TLP521-2 output will conducting, starts to start microcomputer, display; When capacitor C 3 is during lower than 0.7V, optical coupling integrated device TLP521-2 output will be closed.Now, capacitor C 2 is connected in circuit by normally-closed contact K2, common terminal K1, the former limit L1 of inductance transformer, and capacitor C 2 is charged, and voltage is supply voltage 12V.
When supply voltage is constant, optical coupling integrated device TLP521-2 output depends on the size of the numerical value of capacitor C 3 and resistance R switching time.
When will lower class hour, teacher closes blackboard.The moment that blackboard is closed, the normally opened contact K3 closure of micro limit switch, normally-closed contact K2 opens, now L1, C2 form closed-loop path by the normally opened contact K3 of micro limit switch, capacitor C 2 is by K3, L1 electric discharge, can in the former change of inductance transformer L1, form very large instantaneous discharge electric current equally, instantaneous discharge electric current continues to capacitor C 2 electric discharges to be finished.The instantaneous discharge electric current of the former limit L1 of inductance transformer, can produce onesize electric current (voltage) at inductance transformer secondary L2.The transient current that inductance transformer secondary L2 produces, via the phase-sensitive rectifier circuit rectification of diode D1, D2, D3, D4 composition, form the constant direct current of direction, and this charges to capacitor C 3 again.When capacitor C 3 is during higher than 0.7V, optical coupling integrated device TLP521-2 output will conducting, starts to close microcomputer, display; When capacitor C 3 is during lower than 0.7V, optical coupling integrated device TLP521-2 output will be closed.Now, the normally opened contact K3 closure of micro limit switch, normally-closed contact K2 opens, and power supply is disconnected, and capacitor C 2 is not charged, does not consume electric energy.
In the present embodiment, power supply 12V1A, flat wave capacitor C1 is 3000uF/16V, and inductance transformer L is the common mode smoothing reactor of pc switching mode power supply, and induction reactance is 30mh left and right, and capacitor C 2 is 3000uF/16V, and capacitor C 3 is 2000uF/16V, and resistance R is 1000 ohm.Optical coupling integrated device is TLP521-2.Phase sensitivity diode D1, D2, D3, D4 are 1N404.Optocoupler output ON time is about 1 second, guarantees microcomputer, screen opening.
Claims (4)
1. intelligent electronic white board one key switch machine, it is characterized in that, mainly by micro limit switch K, inductance transformer L, phase-sensitive rectifier circuit, steady wave circuit and terminal control the electric circuit constitute, the normally closed terminals of micro limit switch K and Chang Kai terminals connect respectively positive pole and the negative pole of DC power supply, the common terminal of micro limit switch K connects the one end on the former limit of inductance transformer L, the other end on the former limit of inductance transformer L is connected on often opening on terminals of micro limit switch K after connecting with capacitor C 2, inductance transformer L secondary passes through phase-sensitive rectifier circuit, steady wave circuit connects terminal control circuit, the key switch of terminal control circuit and microcomputer and liquid crystal display also connects.
2. intelligent electronic white board one key switch machine according to claim 1, is characterized in that, described phase-sensitive rectifier circuit is the bridge rectifier being constituted by a diode.
3. intelligent electronic white board one key switch machine according to claim 1, it is characterized in that, described steady wave circuit consists of resistance R, capacitor C 3, capacitor C 3 is connected in series with resistance R with phase-sensitive rectifier circuit and after connecting, then is connected with the key switch of microcomputer and liquid crystal display by terminal control circuit.
4. intelligent electronic white board one key switch machine according to claim 1, is characterized in that, described terminal control circuit is electrical isolation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320699161.5U CN203563041U (en) | 2013-11-07 | 2013-11-07 | One-key startup and shutdown device for intelligent electronic white board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320699161.5U CN203563041U (en) | 2013-11-07 | 2013-11-07 | One-key startup and shutdown device for intelligent electronic white board |
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| CN203563041U true CN203563041U (en) | 2014-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320699161.5U Expired - Fee Related CN203563041U (en) | 2013-11-07 | 2013-11-07 | One-key startup and shutdown device for intelligent electronic white board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106781713A (en) * | 2016-12-16 | 2017-05-31 | 明基电通有限公司 | A kind of plug-type multimedia performance device |
-
2013
- 2013-11-07 CN CN201320699161.5U patent/CN203563041U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106781713A (en) * | 2016-12-16 | 2017-05-31 | 明基电通有限公司 | A kind of plug-type multimedia performance device |
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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 |
Granted publication date: 20140423 Termination date: 20141107 |
|
| EXPY | Termination of patent right or utility model |