CN206819718U - A kind of key of luminous energy liquid crystal writing plate one wipes control circuit system - Google Patents
A kind of key of luminous energy liquid crystal writing plate one wipes control circuit system Download PDFInfo
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- CN206819718U CN206819718U CN201720339087.4U CN201720339087U CN206819718U CN 206819718 U CN206819718 U CN 206819718U CN 201720339087 U CN201720339087 U CN 201720339087U CN 206819718 U CN206819718 U CN 206819718U
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 80
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 80
- 229920000642 polymer Polymers 0.000 claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims description 25
- 230000005611 electricity Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 230000005669 field effect Effects 0.000 claims 1
- 239000000428 dust Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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Abstract
It the utility model is related to a kind of key of luminous energy liquid crystal writing plate one erasing control circuit system, the key being connected including output end by wire with liquid crystal display film is wiped control circuit and is connected, the input of one key erasing control circuit is connected with poly-lithium battery, one key erasing control circuit includes poly-lithium battery charging circuit, electronic switching circuit, power supply circuit, polymer lithium cell electric amount detects circuit, booster circuit, erasing circuit, indicator light circuit and governor circuit, poly-lithium battery charging circuit is connected with poly-lithium battery, the input of electronic switching circuit and the positive pole of poly-lithium battery connect.The utility model uses such scheme, is that the handwriting that luminous energy liquid crystal writing plate can be achieved wipes work only by a button, is particularly suitable for use in and the operation of a key erasing is carried out for the larger plate face of write area, time saving and energy saving, environmental protection, erasing are without dust.
Description
Technical field：
It the utility model is related to a kind of key of luminous energy liquid crystal writing plate one erasing control circuit system.
Background technology：
Luminous energy liquid crystal writing plate is a kind of Novel writing board that can replace traditional blackboard chalk-writing, can be by hard
Thing is write on liquid crystal display film, and writing is clear, no writing dust, environmental protection, similar to the application of traditional blackboard, luminous energy liquid
After brilliant clipboard writing, writing will not eliminate, unless perform similarly to traditional blackboard carries out erasing out handwriting with blackboard eraser
Operation, but the characteristic due to luminous energy liquid crystal writing plate in itself determines that it can not utilize the erasing instruments such as traditional blackboard eraser to enter
Row erasing out handwriting, and the write area of general luminous energy liquid crystal writing plate is larger, if recycling tradition black after having write a whole plate
The mode of blackboard eraser erasing out handwriting wastes time and energy.
Utility model content：
The utility model is in order to make up the deficiencies in the prior art, there is provided a kind of key of luminous energy liquid crystal writing plate one erasing control
Circuit system, it is that the handwriting that luminous energy liquid crystal writing plate can be achieved wipes work only by a button, is particularly suitable for use in pair
The operation of a key erasing is carried out in the larger plate face of write area, time saving and energy saving, environmental protection, erasing solve existing skill without dust
Problem present in art.
The utility model is that technical scheme is used by solving above-mentioned technical problem：
A kind of key of luminous energy liquid crystal writing plate one wipes control circuit system, including output end passes through wire and liquid crystal display film
Connected key erasing control circuit connection, the input of key erasing control circuit are connected with poly-lithium battery, and a key is wiped
Except control circuit includes poly-lithium battery charging circuit, electronic switching circuit, power supply circuit, the detection of polymer lithium cell electric amount
Circuit, booster circuit, erasing circuit, indicator light circuit and governor circuit, poly-lithium battery charging circuit and polymer lithium electricity
Pond connects, and the input of electronic switching circuit and the positive pole of poly-lithium battery connect, the output end of electronic switching circuit and confession
Circuit, polymer lithium cell electric amount detection circuit and the input of booster circuit are respectively connected with, the output end of booster circuit with
Erasing circuit is connected, and erasing circuit is connected with wire, and power supply circuit is connected with governor circuit, polymer lithium cell electric amount detection electricity
Road is connected with governor circuit, and governor circuit connects respectively with electronic switching circuit, booster circuit, erasing circuit and indicator light circuit
Connect.
The governor circuit includes main control chip U4 (C8051F330), main control chip U4 the 2nd, 3 pins and power supply circuit
Connection, main control chip U4 the 4th, 5 pins be connected with download program mouth J3, main control chip U4 the 6th pin and polymer lithium are electric
The connection of pond electric quantity detecting circuit, main control chip U4 the 7th, 8,10,11 pins be connected with erasing circuit, the 9th of main control chip U4 the
Pin is connected with booster circuit, main control chip U4 the 16th, 17 pins be connected with electronic switching circuit, the 20th of main control chip U4 the
Pin is connected with indicator light circuit.
The poly-lithium battery charging circuit includes Micro USB seats J2, Micro USB seats J2 the 1st pin and electricity
Source control chip U1 (TP4057) the 4th pin connection, Micro USB seats J2 the 5th pin ground connection, power management chip U1's
The positive pole of 3rd pin and the 4th pin respectively with electric capacity E1 and E2 is connected, and is grounded after electric capacity E1 and E2 another extremely parallel connection, power supply
Managing chip U1 the 3rd pin is connected with poly-lithium battery socket J1, poly-lithium battery socket J1 and poly-lithium battery
It is connected, power management chip U1 the 1st pin is connected with indicator lamp D1 negative pole, and power management chip U1 the 5th pin is with referring to
Show that lamp D2 negative pole is connected, indicator lamp D1 positive pole with connected after indicator lamp D2 positive pole parallel connection with resistance R3 then resistance R3 again
It is connected with Micro USB seats J2 the 1st pin, power management chip U1 the 6th pin is connected with charging current limiter resistance R1 to be followed by
Ground.
The electronic switching circuit, which includes resetting, closes S2, reset switch S2 one end and the positive pole phase of poly-lithium battery
Even, the other end is connected with self- recoverage insurance F1, and self- recoverage insurance F1 is connected with FET Q1 source electrode, FET Q1 leakage
Input of the pole respectively with power supply circuit, polymer lithium cell electric amount detection circuit and booster circuit is connected, and diode D3 is just
Pole is connected with resistance R5 one end, and the resistance R5 other end is connected with the output end of power supply circuit, diode D3 negative pole and two
Pole pipe D4 negative pole is connected, and diode D4 positive pole is connected after being connected with resistance R7 with FET Q1 source electrode, diode D4
Positive pole be connected with FET Q1 grid, key erasing button S1 one end ground connection, the negative pole of the other end and diode D4,
Main control chip U4 the 17th pin is connected with diode D3 positive pole, triode Q2 colelctor electrode and FET Q1 grid phase
Even, resistance R11 one end is connected with triode Q2 emitter stage, the other end connected with resistance R12 after with main control chip U4 the
16 pins are connected, triode Q2 grounded emitter.
The power supply circuit includes LDO voltages adjustment chip U2, LDO voltage adjuster chip U2 the 1st pin and the 3rd pipe
Pin is connected with the output end of electronic switching circuit, after one end parallel connection of filter capacitor E3 positive pole and filter capacitor C2 with LDO
Voltage adjuster chip U2 the 1st pin is connected, and is grounded after the other end parallel connection of filter capacitor E3 negative pole and filter capacitor C2,
Filter capacitor C3 both ends are connected with LDO voltage adjuster chips U2 the 2nd pin and the 5th pin respectively, LDO voltage adjusters
Chip U2 the 2nd pin and the 5th pin respectively with main control chip U4 the 2nd, 3 pins are connected.
The polymer lithium cell electric amount detection circuit includes two resistance R9 and R10 of series connection, the resistance of series circuit
R9 ends are grounded, and resistance R10 ends are connected with the output end of electronic switching circuit, and a filter capacitor C8 is in parallel with resistance R9, filtered electrical
Hold C8 one end ground connection, the other end is connected with main control chip U4 the 6th pin.
The booster circuit includes boost chip U3, boost chip U3 (XL6007E1) the 1st pin and main control chip U4
The connection of the 9th pin, boost chip U3 the 2nd pin is connected with the output end of electronic switching circuit, and filter capacitor C4 and E4 are simultaneously
Connection, one end of parallel circuit are connected with boost chip U3 the 2nd pin, other end ground connection, the pins of boost chip U3 the 3rd and resistance
R15 connects with R16, and inductance L1 one end is connected with Schottky diode D6 positive pole, inductance the L1 other end and boost chip
U3 the 2nd pin is connected, and Schottky diode D6 positive pole is connected with the 5th of boost chip U3 the, 6 pins, boost chip U3
The 7th, 8 pins be grounded, regulation resistance R15 and R16 one end are connected with boost chip U3 the 3rd pin, regulation resistance
The R15 and R16 other end is electric capacity C5 one end ground connection with being grounded and being connected with Schottky diode D6 negative pole respectively, separately
One end is connected with Schottky diode D6 negative pole, and Schottky diode D6 negative pole is connected with the input of erasing circuit.
The erasing circuit includes FET Q3, FET Q3 current collection of the grid through resistance R20 Yu triode Q4
Extremely it is connected, triode Q4 grounded emitter, triode Q4 base stage is connected through resistance R21 with main control chip U4 the 7th pin,
Resistance R17 one end is connected with FET Q3 grid, and the other end is connected with FET Q3 source electrode, FET Q3's
Drain electrode is connected through resistance R18 with no material consumption liquid crystal film charge and discharge electrical interface J5 the 1st pin, and triode Q5 base stage is through resistance R23
It is connected with main control chip U4 the 8th pin, triode Q5 grounded emitter, triode Q5 colelctor electrode is through resistance R19 and nothing
Consumptive material liquid crystal film charge and discharge electrical interface J5 the 1st pin is connected；Current collection of the FET Q6 grid through resistance R27 Yu triode Q7
Extremely it is connected, triode Q7 grounded emitter, 10th pin phase of the triode Q7 base stage through resistance R28 and main control chip U4
Even, resistance R14 one end is connected with FET Q6 grid, and the other end is connected with FET Q6 source electrode, FET
Q6 drain electrode is connected through resistance R25 with no material consumption liquid crystal film charge and discharge electrical interface J5 the 2nd pin, and triode Q8 base stage is through resistance
R30 is connected with main control chip U4 the 11st pin, triode Q8 grounded emitter, and triode Q8 colelctor electrode is through resistance R26
Be connected with no material consumption liquid crystal film charge and discharge electrical interface J5 the 2nd pin, FET Q3 and FET Q6 source electrode with boosting
The output end of circuit is connected.
The indicator light circuit includes LED light D5, LED light D5 positive pole connected with resistance R13 after with master control
Chip U4 the 20th pin is connected, LED light D5 negative pole ground connection.
The utility model uses such scheme, is only the handwriting that luminous energy liquid crystal writing plate can be achieved by a button
Work is wiped, is particularly suitable for use in and the operation of a key erasing is carried out for the larger plate face of write area, it is time saving and energy saving, environmental protection, wipe
Except without dust.
Brief description of the drawings：
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the poly-lithium battery charging circuit schematic diagram of key erasing control circuit in the utility model.
Fig. 3 is the electronic switching circuit schematic diagram of key erasing control circuit in the utility model.
Fig. 4 is the power supply circuit schematic diagram of key erasing control circuit in the utility model.
Fig. 5 is the polymer lithium cell electric amount detection circuit theory diagrams of key erasing control circuit in the utility model.
Fig. 6 is the booster circuit schematic diagram of key erasing control circuit in the utility model.
Fig. 7 is the erasing circuit schematic diagram of key erasing control circuit in the utility model.
Fig. 8 is the indicator light circuit schematic diagram of key erasing control circuit in the utility model.
Fig. 9 is the governor circuit schematic diagram of key erasing control circuit in the utility model.
Embodiment：
For the technical characterstic for illustrating this programme can be understood, below by embodiment, and its accompanying drawing is combined, to this reality
It is described in detail with new.
As shown in figs 1-9, a kind of key of luminous energy liquid crystal writing plate one erasing control circuit system, including output end pass through wire
The key erasing control circuit being connected with liquid crystal display film is connected, and a key wipes the input and poly-lithium battery of control circuit
It is connected, key erasing control circuit includes poly-lithium battery charging circuit, electronic switching circuit, power supply circuit, polymer lithium
Battery power detection circuit, booster circuit, erasing circuit, indicator light circuit and governor circuit, poly-lithium battery charging circuit
It is connected with poly-lithium battery, the input of electronic switching circuit and the positive pole of poly-lithium battery connect, electronic switching circuit
Output end and power supply circuit, the polymer lithium cell electric amount detection circuit and input of booster circuit be respectively connected with, boosting electricity
The output end on road is connected with erasing circuit, and erasing circuit is connected with wire, and power supply circuit is connected with governor circuit, polymer lithium electricity
Pond electric quantity detecting circuit is connected with governor circuit, governor circuit and electronic switching circuit, booster circuit, erasing circuit and indicator lamp
Circuit connects respectively.
Electronic switching circuit is used for the "on" position for controlling key erasing control circuit, and booster circuit connects with erasing circuit
Connect, the liquid crystal display film erasing voltage that erasing needs is provided for erasing circuit, power supply circuit is connected with governor circuit, is master control electricity
Road provides supply voltage, and polymer lithium cell electric amount detection circuit is connected with governor circuit, and polymer lithium is provided for governor circuit
Battery electric quantity detects voltage, and indicator light circuit is connected with governor circuit, for indicating erasing operation and polymer battery electricity not
Sufficient and too low alarm, governor circuit are connected with electronic switching circuit, booster circuit, erasing circuit, control whole system power supply,
The state of the work of booster circuit, the execution of erasing operation etc., when the key of flicking one wipes the electronic switching circuit in control circuit
On a button when, whole system moment simultaneously keeps powering, while starts booster circuit work, and by needed for liquid crystal display film
Erasing voltage be delivered to by erasing circuit on liquid crystal display film, to handwriting carry out erasing operation, while indicator lamp electricity
Once, function above is realized all by the chip controls in governor circuit, the chip in governor circuit for indicator lamp flicker in road
Electric circuit inspection polymer lithium cell electric pressure is constantly detected by polymer lithium cell electric amount while erasing control is performed, when poly-
Compound electric quantity of lithium battery is insufficient and it is too low when indicator light circuit in indicator lamp can flash alarm automatically, now need to pass through polymerization
Thing lithium battery charging circuit charges to poly-lithium battery.
The governor circuit includes main control chip U4, main control chip U4 (C8051F330) the 2nd, 3 pins and power supply circuit
Connection, power supply circuit give main control chip U4 offer supply voltages after change voltage stabilizing, main control chip U4 the 4th, 5 pins and journey
Sequence downloads mouth J3 connections, realizes the download program burning function of main control chip, main control chip U4 the 6th pin and polymer lithium electricity
Pond electric quantity detecting circuit connection, polymer lithium cell electric amount information is accessed with voltage signal main control chip U4 the 6th pin, entered
Row analog-to-digital conversion.Main control chip U4 the 7th, 8,10,11 pins be connected with erasing circuit, control triode Q4, Q5, Q7, Q8's
Conducting and cut-off state, main control chip U4 the 9th pin are connected with booster circuit (referring to such as Fig. 6), are controlled in booster circuit
Whether boost chip U3 mode of operation is boost mode.Main control chip U4 the 16th, 17 pins and electronic switching circuit (referring to
Such as Fig. 3) connection, detection one key erasing button S1 state, control triode Q2 working condition, so as to control FET Q1
Working condition, main control chip U4 the 20th pin is connected with indicator light circuit (referring to such as Fig. 8), controls the work of LED light
Make state.
The poly-lithium battery charging circuit includes Micro USB seats J2, Micro USB seats J2 the 1st pin and electricity
Source control chip U1 (TP4057) the 4th pin connection, Micro USB seats J2 the 5th pin ground connection, power management chip U1's
The positive pole of 3rd pin and the 4th pin respectively with electric capacity E1 and E2 is connected, and is grounded after electric capacity E1 and E2 another extremely parallel connection, power supply
Managing chip U1 the 3rd pin is connected with poly-lithium battery socket J1, poly-lithium battery socket J1 and poly-lithium battery
It is connected, power management chip U1 the 1st pin is connected with indicator lamp D1 negative pole, and power management chip U1 the 5th pin is with referring to
Show that lamp D2 negative pole is connected, indicator lamp D1 positive pole with connected after indicator lamp D2 positive pole parallel connection with resistance R3 then resistance R3 again
It is connected with Micro USB seats J2 the 1st pin, power management chip U1 the 6th pin is connected with charging current limiter resistance R1 to be followed by
Ground.When using Micro USB seats J2 by power management chip U1 to poly-lithium battery carry out charging process in, charged state
Often bright D2 extinguishes indicator lamp D1, and after poly-lithium battery is fully charged, charge status indicating light D1 is changed into extinguishing D2 and is changed into Chang Liang,
Resistance size by changing charging current limiter resistance R1 can change the charging current to poly-lithium battery.
The electronic switching circuit, which includes resetting, closes S2, reset switch S2 one end and the positive pole phase of poly-lithium battery
Even, the other end is connected with self- recoverage insurance F1, and self- recoverage insurance F1 is connected with FET Q1 source electrode, FET Q1 leakage
Input of the pole respectively with power supply circuit, polymer lithium cell electric amount detection circuit and booster circuit is connected, and diode D3 is just
Pole is connected with resistance R5 one end, and the resistance R5 other end is connected with the output end of power supply circuit, is in the present embodiment and LDO
Voltage adjuster chip U2 the 5th pin is connected.Diode D3 negative pole is connected with diode D4 negative pole, and diode D4 is just
Pole is connected after being connected with resistance R7 with FET Q1 source electrode, and diode D4 positive pole is connected with FET Q1 grid,
One key erasing button S1 one end ground connection, the negative pole of the other end and diode D4, main control chip U4 the 17th pin and diode
D3 positive pole is connected, and triode Q2 colelctor electrode is connected with FET Q1 grid, and resistance R11 one end is with triode Q2's
Emitter stage is connected, and the other end is connected after being connected with resistance R12 with main control chip U4 the 16th pin, and triode Q2 emitter stage connects
Ground.
Reset switch S2 is normally closed switch, the closure conducting of normal condition lower switch, is switched off when pressing, is for realizing
Power-off restoration is carried out by this reset switch S2 when system deadlock abnormal problem occurs, self- recoverage insurance F1 is used to protect late-class circuit
Occur quickly disconnecting when short circuit etc. is abnormal, so as to cut off electric power system, after Abnormality remove, self- recoverage insurance F1 is automatically replied just
Normally on works.FET Q1 (AO3401) is used to control rear class electric power system break-make, and FET Q1 and a key are wiped
Except button S1 connections, after next key erasing button S1 is pressed, FET Q1 grid is changed into low level, FET Q1 source
Turned between pole and drain electrode, power supply is powered by FET Q1 for rear class, key erasing button S1 and triode Q2 and master control
Circuit connects, after governor circuit detects that key erasing button S1 is pressed, control triode Q2 conductings, so that FET Q1
It is in the conduction state to power for rear class and perform erasing operation, after erasing operation is finished, the display on liquid crystal display film
Writing eliminates automatically, main control chip (C8051F330) the control triode Q2 cut-offs of governor circuit, so that FET Q1 becomes
Rear class power supply is cut off for cut-off state.
The power supply circuit includes LDO voltages adjustment chip U2, LDO voltage adjuster chip U2 the 1st pin and the 3rd pipe
Pin is connected with the output end of electronic switching circuit, after one end parallel connection of filter capacitor E3 positive pole and filter capacitor C2 with LDO
Voltage adjuster chip U2 the 1st pin is connected, and is grounded after the other end parallel connection of filter capacitor E3 negative pole and filter capacitor C2,
Filter capacitor C3 both ends are connected with LDO voltage adjuster chips U2 the 2nd pin and the 5th pin respectively, LDO voltage adjusters
Chip U2 the 2nd pin and the 5th pin respectively with main control chip U4 the 2nd, 3 pins are connected.
LDO voltage adjuster chip U2 (XC6219B332MR) are connected with filter capacitor E3, C2, C3, for carrying out voltage
Conversion, the supply voltage of poly-lithium battery is changed into voltage stabilizing to 3.3V, voltage-stabilized power supply is provided for governor circuit.
The polymer lithium cell electric amount detection circuit includes two resistance R9 and R10 of series connection, the resistance of series circuit
R9 ends are grounded, and resistance R10 ends are connected with the output end of electronic switching circuit, and a filter capacitor C8 is in parallel with resistance R9, filtered electrical
Hold C8 one end ground connection, the other end is connected with main control chip U4 the 6th pin.
Resistance R9 and R10 form potential-divider network, polymer lithium cell electric are pressed after carrying out partial pressure, connected by filter capacitor C8
The main control chip for being connected to governor circuit carries out analog-to-digital conversion, for constantly detecting polymer lithium cell electric pressure.
The booster circuit includes boost chip U3, boost chip U3 (XL6007E1) the 1st pin and main control chip U4
The connection of the 9th pin, boost chip U3 the 2nd pin is connected with the output end of electronic switching circuit, and filter capacitor C4 and E4 are simultaneously
Connection, one end of parallel circuit are connected with boost chip U3 the 2nd pin, other end ground connection, the pins of boost chip U3 the 3rd and resistance
R15 connects with R16, and inductance L1 one end is connected with Schottky diode D6 positive pole, inductance the L1 other end and boost chip
U3 the 2nd pin is connected, and Schottky diode D6 positive pole is connected with the 5th of boost chip U3 the, 6 pins, boost chip U3
The 7th, 8 pins be grounded, regulation resistance R15 and R16 one end are connected with boost chip U3 the 3rd pin, regulation resistance
The R15 and R16 other end is electric capacity C5 one end ground connection with being grounded and being connected with Schottky diode D6 negative pole respectively, separately
One end is connected with Schottky diode D6 negative pole, and Schottky diode D6 negative pole is connected with the input of erasing circuit.
Boost chip U3 (XL6007E1) connection filter capacitor E4, C4, C5, pass through inductance L1, Schottky diode D6
(RB160M-60) boosted, the erasing voltage of liquid crystal display film is provided for erasing circuit, the voltage of boost chip U3 boostings is big
The small parameter by regulation resistance R15 and R16 is completed, and boost chip U3 the 1st pin and the main control chip of governor circuit connect
Connect, whether the mode of operation that boost chip U3 is controlled by main control chip is boost mode.
The erasing circuit includes FET Q3, FET Q3 current collection of the grid through resistance R20 Yu triode Q4
Extremely it is connected, triode Q4 grounded emitter, triode Q4 base stage is connected through resistance R21 with main control chip U4 the 7th pin,
Resistance R17 one end is connected with FET Q3 grid, and the other end is connected with FET Q3 source electrode, FET Q3's
Drain electrode is connected through resistance R18 with no material consumption liquid crystal film charge and discharge electrical interface J5 the 1st pin, and triode Q5 base stage is through resistance R23
It is connected with main control chip U4 the 8th pin, triode Q5 grounded emitter, triode Q5 colelctor electrode is through resistance R19 and nothing
Consumptive material liquid crystal film charge and discharge electrical interface J5 the 1st pin is connected；Current collection of the FET Q6 grid through resistance R27 Yu triode Q7
Extremely it is connected, triode Q7 grounded emitter, 10th pin phase of the triode Q7 base stage through resistance R28 and main control chip U4
Even, resistance R14 one end is connected with FET Q6 grid, and the other end is connected with FET Q6 source electrode, FET
Q6 drain electrode is connected through resistance R25 with no material consumption liquid crystal film charge and discharge electrical interface J5 the 2nd pin, and triode Q8 base stage is through resistance
R30 is connected with main control chip U4 the 11st pin, triode Q8 grounded emitter, and triode Q8 colelctor electrode is through resistance R26
Be connected with no material consumption liquid crystal film charge and discharge electrical interface J5 the 2nd pin, FET Q3 and FET Q6 source electrode with boosting
The output end of circuit is connected.
The main control chip of triode Q4, Q5, Q7, Q8 and governor circuit connects, by main control chip control triode Q4,
Q5, Q7, Q8 conducting and cut-off state, so as to control FET Q3, Q6 conducting and cut-off state, main control chip control three
When pole pipe Q4 and Q8 base stage are high level, triode Q5 and Q7 base stage are low level, FET Q3 conducting Q6 cut-offs, wipe
Except circuit by no material consumption liquid crystal film charge and discharge electrical interface J5 is that no material consumption liquid crystal film carries out positive discharge and recharge, main control chip control three
When pole pipe Q4 and Q8 base stage are low level, triode Q5 and Q7 base stage are high level, FET Q3 cut-off Q6 conductings, wipe
Except circuit by no material consumption liquid crystal film charge and discharge electrical interface J5 is that no material consumption liquid crystal film carries out reverse discharge and recharge, pass through forward and reverse charge and discharge
Display writing of the electricity to liquid crystal display film performs erasing operation.
The indicator light circuit includes LED light D5, LED light D5 positive pole connected with resistance R13 after with master control
Chip U4 the 20th pin is connected, LED light D5 negative pole ground connection.
Resistance R13 one end and the main control chip of governor circuit connect, and are controlled by main control chip and realize execution erasing behaviour
When making LED light D5 flickers once, polymer lithium cell electric amount is insufficient and it is too low when LED light D5 flash alarm automatically.
The electronic switching circuit that poly-lithium battery wipes control circuit by a key is powered to system, and passes through confession
Polymer lithium cell electric is pressed conversion voltage stabilizing to 3.3V by circuit, and 3.3V voltages are the master control electricity that a whole key wipes control circuit
Road supply voltage, at the same time poly-lithium battery pass through a key wipe control circuit electronic switching circuit after connection boosting electricity
Road, power supply is provided for booster circuit, for polymer lithium cell electric pressure to be boosted to the erasing voltage needed for liquid crystal display film, wiped
Liquid crystal display film is delivered to except voltage is connected by erasing circuit wire.When the key of flicking one wipes the electronic cutting in control circuit
During key erasing button S1 on powered-down road, whole system moment simultaneously keeps powering, while starts booster circuit work, and by liquid
Crystalline substance shows that the erasing voltage needed for film is delivered on liquid crystal display film by erasing circuit, and erasing operation is carried out to handwriting,
Once, function above is realized and all controlled by main control chip U4, master control core for LED light D5 flickers in indicator light circuit simultaneously
Piece U4 constantly detects electric circuit inspection polymer lithium cell electric pressure while erasing control is performed by polymer lithium cell electric amount,
LED light D5 when polymer lithium cell electric amount is insufficient and too low in indicator light circuit can flash alarm automatically, now need
Poly-lithium battery is charged by poly-lithium battery charging circuit with Micro USB seats J2.
Part is not described in detail for the utility model, is the known technology of those skilled in the art of the present technique.
Claims (9)
1. a kind of key of luminous energy liquid crystal writing plate one wipes control circuit system, it is characterised in that：Including output end by wire with
The connected key erasing control circuit connection of liquid crystal display film, a key wipe the input and poly-lithium battery phase of control circuit
Even, key erasing control circuit includes poly-lithium battery charging circuit, electronic switching circuit, power supply circuit, polymer lithium electricity
Pond electric quantity detecting circuit, booster circuit, erasing circuit, indicator light circuit and governor circuit, poly-lithium battery charging circuit with
Poly-lithium battery connects, and the input of electronic switching circuit and the positive pole of poly-lithium battery connect, electronic switching circuit
Output end and the input of power supply circuit, polymer lithium cell electric amount detection circuit and booster circuit are respectively connected with, booster circuit
Output end be connected with erasing circuit, erasing circuit is connected with wire, and power supply circuit is connected with governor circuit, poly-lithium battery
Electric quantity detecting circuit is connected with governor circuit, governor circuit and electronic switching circuit, booster circuit, erasing circuit and indicator lamp electricity
Road connects respectively.
A kind of 2. key of luminous energy liquid crystal writing plate one erasing control circuit system according to claim 1, it is characterised in that：Institute
Stating governor circuit includes the 2nd of main control chip U4, the main control chip U4 model C8051F330, main control chip U4 the, 3 pins
Be connected with power supply circuit, main control chip U4 the 4th, 5 pins be connected with download program mouth J3, main control chip U4 the 6th pin with
Polymer lithium cell electric amount detection circuit connection, main control chip U4 the 7th, 8,10,11 pins be connected with erasing circuit, master control core
Piece U4 the 9th pin is connected with booster circuit, main control chip U4 the 16th, 17 pins be connected with electronic switching circuit, master control core
Piece U4 the 20th pin is connected with indicator light circuit.
A kind of 3. key of luminous energy liquid crystal writing plate one erasing control circuit system according to claim 1, it is characterised in that：Institute
Stating poly-lithium battery charging circuit includes Micro USB seats J2, Micro USB seats J2 the 1st pin and power management chip
U1 the 4th pin connection, the 5th pin ground connection of power management chip U1 models TP4057, Micro USB the seats J2, electricity
The source control chip U1 positive pole of the 3rd pin and the 4th pin respectively with electric capacity E1 and E2 is connected, electric capacity E1 and E2 another pole
It is grounded after parallel connection, power management chip U1 the 3rd pin is connected with poly-lithium battery socket J1, poly-lithium battery socket J1
It is connected with poly-lithium battery, power management chip U1 the 1st pin is connected with indicator lamp D1 negative pole, power management chip U1
The 5th pin be connected with indicator lamp D2 negative pole, gone here and there after indicator lamp D1 positive pole is in parallel with indicator lamp D2 positive pole with resistance R3
Connection and then 1st pins of the resistance R3 again with Micro USB seats J2 are connected, power management chip U1 the 6th pin and charging current limiter
It is grounded after resistance R1 connections.
A kind of 4. key of luminous energy liquid crystal writing plate one erasing control circuit system according to claim 2, it is characterised in that：Institute
State electronic switching circuit and include resetting and close S2, reset switch S2 one end is connected with the positive pole of poly-lithium battery, the other end with
Self- recoverage insurance F1 series connection, self- recoverage insurance F1 are connected with FET Q1 source electrode, FET Q1 drain electrode respectively with confession
Circuit, polymer lithium cell electric amount detection circuit are connected with the input of booster circuit, diode D3 positive pole and resistance R5
One end be connected, the resistance R5 other end is connected with the output end of power supply circuit, and diode D3 negative pole is negative with diode D4's
Extremely it is connected, diode D4 positive pole is connected after being connected with resistance R7 with FET Q1 source electrode, diode D4 positive pole and field
Effect pipe Q1 grid is connected, key erasing button S1 one end ground connection, the negative pole of the other end and diode D4, main control chip U4
The 17th pin be connected with diode D3 positive pole, triode Q2 colelctor electrode is connected with FET Q1 grid, resistance R11
One end be connected with triode Q2 emitter stage, the other end and resistance R12 are connected after connecting with main control chip U4 the 16th pin,
Triode Q2 grounded emitter.
A kind of 5. key of luminous energy liquid crystal writing plate one erasing control circuit system according to claim 2, it is characterised in that：Institute
State power supply circuit include LDO voltages adjustment chip U2, LDO voltage adjuster chip U2 the 1st pin and the 3rd pin and electronics
The output end of on-off circuit is connected, after one end parallel connection of filter capacitor E3 positive pole and filter capacitor C2 with LDO voltage adjusters
Chip U2 the 1st pin is connected, and is grounded after the other end parallel connection of filter capacitor E3 negative pole and filter capacitor C2, filter capacitor C3
Both ends be connected respectively with LDO voltage adjuster chips U2 the 2nd pin and the 5th pin, the of LDO voltage adjuster chips U2
2 pins and the 5th pin respectively with main control chip U4 the 2nd, 3 pins are connected.
A kind of 6. key of luminous energy liquid crystal writing plate one erasing control circuit system according to claim 2, it is characterised in that：Institute
Stating polymer lithium cell electric amount detection circuit includes two resistance R9 and R10 of series connection, the resistance R9 ends ground connection of series circuit, electricity
Resistance R10 ends are connected with the output end of electronic switching circuit, and a filter capacitor C8 is in parallel with resistance R9, a filter capacitor C8 termination
Ground, the other end are connected with main control chip U4 the 6th pin.
A kind of 7. key of luminous energy liquid crystal writing plate one erasing control circuit system according to claim 2, it is characterised in that：Institute
Stating booster circuit includes boost chip U3, and boost chip U3 the 1st pin is connected with main control chip U4 the 9th pin, the liter
Pressure chip U3 model XL6007E1, boost chip U3 the 2nd pin are connected with the output end of electronic switching circuit, filter capacitor
C4 and E4 is in parallel, and one end of parallel circuit is connected with boost chip U3 the 2nd pin, and other end ground connection, boost chip U3 the 3rd is managed
Pin is connected with resistance R15 and R16, and inductance L1 one end is connected with Schottky diode D6 positive pole, the inductance L1 other end with
Boost chip U3 the 2nd pin is connected, and Schottky diode D6 positive pole is connected with the 5th of boost chip U3 the, 6 pins, rises
The 7th of chip U3 the, 8 pins are pressed to be grounded, regulation resistance R15 and R16 one end are connected with boost chip U3 the 3rd pin,
Regulation resistance R15 and the R16 other end are electric capacity C5 one end with being grounded and being connected with Schottky diode D6 negative pole respectively
Ground connection, the other end are connected with Schottky diode D6 negative pole, Schottky diode D6 negative pole and the input of erasing circuit
It is connected.
A kind of 8. key of luminous energy liquid crystal writing plate one erasing control circuit system according to claim 2, it is characterised in that：Institute
Stating erasing circuit includes FET Q3, and FET Q3 grid is connected through resistance R20 with triode Q4 colelctor electrode, three poles
Pipe Q4 grounded emitter, triode Q4 base stage are connected through resistance R21 with main control chip U4 the 7th pin, resistance R17's
One end is connected with FET Q3 grid, and the other end is connected with FET Q3 source electrode, and FET Q3 drain electrode is through electricity
Resistance R18 is connected with no material consumption liquid crystal film charge and discharge electrical interface J5 the 1st pin, and triode Q5 base stage is through resistance R23 and master control core
Piece U4 the 8th pin is connected, triode Q5 grounded emitter, and triode Q5 colelctor electrode is through resistance R19 and no material consumption liquid crystal
Film charge and discharge electrical interface J5 the 1st pin is connected；FET Q6 grid is connected through resistance R27 with triode Q7 colelctor electrode,
Triode Q7 grounded emitter, triode Q7 base stage are connected through resistance R28 with main control chip U4 the 10th pin, resistance
R14 one end is connected with FET Q6 grid, and the other end is connected with FET Q6 source electrode, FET Q6 drain electrode
It is connected through resistance R25 with no material consumption liquid crystal film charge and discharge electrical interface J5 the 2nd pin, triode Q8 base stage is through resistance R30 and master
Control chip U4 the 11st pin is connected, and triode Q8 grounded emitter, triode Q8 colelctor electrode is through resistance R26 and no material consumption
Liquid crystal film charge and discharge electrical interface J5 the 2nd pin is connected, and FET Q3 and FET Q6 source electrode are defeated with booster circuit
Go out end to be connected.
A kind of 9. key of luminous energy liquid crystal writing plate one erasing control circuit system according to claim 2, it is characterised in that：Institute
Stating indicator light circuit includes LED light D5, LED light D5 positive pole connected with resistance R13 after with main control chip U4
20 pins are connected, LED light D5 negative pole ground connection.
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|---|---|---|---|
| CN201720339087.4U CN206819718U (en) | 2017-03-31 | 2017-03-31 | A kind of key of luminous energy liquid crystal writing plate one wipes control circuit system |
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| CN201720339087.4U CN206819718U (en) | 2017-03-31 | 2017-03-31 | A kind of key of luminous energy liquid crystal writing plate one wipes control circuit system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106935219A (en) * | 2017-03-31 | 2017-07-07 | 山东蓝贝易书信息科技有限公司 | A kind of key of luminous energy liquid crystal writing plate one erasing control circuit system |
| CN108550349A (en) * | 2018-03-12 | 2018-09-18 | 深圳市昂米科技有限公司 | A kind of liquid crystal electron board |
| CN110147170A (en) * | 2018-06-11 | 2019-08-20 | 山东蓝贝思特教装集团股份有限公司 | For the multivoltage output circuit of writing film selective erase and application |
| CN111949164A (en) * | 2020-09-08 | 2020-11-17 | 深圳市恒开源电子有限公司 | Split screen liquid crystal handwriting board |
| CN112904606A (en) * | 2020-12-28 | 2021-06-04 | 山东蓝贝思特教装集团股份有限公司 | Bistable liquid crystal writing device with quick electric driving display function and method |
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2017
- 2017-03-31 CN CN201720339087.4U patent/CN206819718U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106935219A (en) * | 2017-03-31 | 2017-07-07 | 山东蓝贝易书信息科技有限公司 | A kind of key of luminous energy liquid crystal writing plate one erasing control circuit system |
| CN108550349A (en) * | 2018-03-12 | 2018-09-18 | 深圳市昂米科技有限公司 | A kind of liquid crystal electron board |
| CN110147170A (en) * | 2018-06-11 | 2019-08-20 | 山东蓝贝思特教装集团股份有限公司 | For the multivoltage output circuit of writing film selective erase and application |
| CN110147170B (en) * | 2018-06-11 | 2024-04-12 | 山东蓝贝思特教装集团股份有限公司 | Multi-voltage output circuit for writing film local erasure and application |
| CN111949164A (en) * | 2020-09-08 | 2020-11-17 | 深圳市恒开源电子有限公司 | Split screen liquid crystal handwriting board |
| CN112904606A (en) * | 2020-12-28 | 2021-06-04 | 山东蓝贝思特教装集团股份有限公司 | Bistable liquid crystal writing device with quick electric driving display function and method |
| CN112904606B (en) * | 2020-12-28 | 2022-03-04 | 山东蓝贝思特教装集团股份有限公司 | Bistable liquid crystal writing device with quick electric driving display function and method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A light-energy liquid crystal writing board one-key erasing control circuit system Effective date of registration: 20220801 Granted publication date: 20171229 Pledgee: Shandong Jiyang Rural Commercial Bank Co., Ltd. Pledgor: SHANDONG LANBEI YISHU INFORMATION TECHNOLOGY CO.,LTD. Registration number: Y2022980011651 |