CN105158616A - Touch screen sensor testing circuit - Google Patents
Touch screen sensor testing circuit Download PDFInfo
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- CN105158616A CN105158616A CN201510632116.1A CN201510632116A CN105158616A CN 105158616 A CN105158616 A CN 105158616A CN 201510632116 A CN201510632116 A CN 201510632116A CN 105158616 A CN105158616 A CN 105158616A
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Abstract
A touch screen sensor testing circuit is connected with a DC voltage, and comprises a first interface, a second interface, a self-excited oscillation module, a combined switch, a voltage comparison module and an indicating module, wherein the first interface is used for connecting an odd number of silver paste lead wires on a touch screen sensor to the combined switch, the second interface is used for connecting an even number of silver paste lead wires on the touch screen sensor to the combined switch, and the self-excited oscillation module converts the DC voltage into an AC voltage and inputs the AC voltage to the combined switch; and the combined switch applies the AC voltage or the DC voltage to the touch screen sensor for detection through the first interface and the second interface and then outputs detection voltages to the voltage comparison module for comparison, and an indication whether silver paste migration occurs in silver paste circuits is represented via the comparative result. The touch screen sensor testing circuit can test silver ion migration status between the adjacent circuits on the touch screen sensor accurately, adjusts testing electrical conditions, is high in flexibility, only needs two lead wires for wiring, and has the advantages of being simple, being high in operability and the like.
Description
Technical field
The present invention relates to Power Electronic Technique, particularly relate to a kind of touch screen induction device test circuit.
Background technology
All with conducting wire on the inductor of resistive touch screen and capacitive touch screen, the common used material of conducting wire mainly contains: transparent ITO (indium tin oxide), silver slurry, molybdenum, aluminium molybdenum etc.And silver slurry because its cost is low, good conductivity, high with base material adhesion, easily graphically process, stability is also high, the inductor of touch-screen is usually used in edge and goes between.But when applying silver slurry circuit, due to silver slurry inherent characteristic, easily producing the phenomenon of silver ion migration after the energising of silver slurry circuit, causing line short there is silver ion migration in application process after, to such an extent as to product failure.
At present in order to test the stability of silver slurry circuit, after touch-screen is carried out, all can carry out reliability test, comprise hot and humid, thermal shock, salt spray test etc.Because silver ion migration is largely occur in "on" position.So need energising to test during test.The test of current inductor is all test silver slurry migration after being made into semifinished or finished goods, due to semi-manufacture and finished product in working order under, voltage and sequential can not meet the electrical condition required for the migration of silver slurry completely, so the accuracy of money migration test is not high, the result of experiment does not possess too large reference significance yet.
Summary of the invention
The object of the invention is to provide a kind of touch screen induction device test circuit, and the accuracy being intended to solve money migration test is not high, and the result of experiment does not possess the problem of too large reference significance yet.
The invention provides a kind of touch screen induction device test circuit, access DC voltage, comprise first interface, the second interface, self-sustained oscillation module, combined switch, voltage comparison module and indicating module, odd number silver slurry lead-in wire, even number silver slurry lead-in wire on touch screen induction device are connected to described combined switch by described first interface, the second interface respectively, described combined switch is connected with described DC voltage and voltage comparison module, and described self-sustained oscillation module is input to described combined switch by after described converting direct-current voltage into alternating-current voltage;
Described combined switch applies described alternating voltage by described first interface and the second interface and DC voltage detects to described touch screen induction device, rear output detections voltage compares to described voltage comparison module, and described indicating module presents according to the comparative result of described voltage comparison module the instruction whether silver slurry circuit the migration of silver slurry occurs.
Preferably, described self-sustained oscillation module comprises self-excited oscillator, the first comparison amplifier and the first phase inverter, and described self-excited oscillator output terminal sine wave output is to the normal phase input end of described first comparison amplifier; The inverting input of described first comparison amplifier accesses a reference voltage, export the control end of phase inverter described in termination, DC voltage described in the input termination of described first phase inverter, the output terminal of described first comparison amplifier is set to the first output node of described self-sustained oscillation module, the output terminal of described first phase inverter is set to second output node contrary with described first output node output level of described self-sustained oscillation module, and the first output node and second output node of described self-sustained oscillation module export described alternating voltage.
Preferably, described combined switch comprises voltage applying unit, voltage output unit, the second phase inverter, reference resistance and change-over switch, described change-over switch is connected with described voltage applying unit, described change-over switch is connected with described voltage output unit by described second phase inverter, and the output terminal of described voltage output unit is passed through described reference resistance ground connection by described voltage applying unit;
Described alternating voltage for accessing described alternating voltage, and is linked on described touch screen induction device by described voltage applying unit; Described DC voltage, for accessing described DC voltage, is linked into the described detection voltage of output after on described touch screen induction device by change-over switch by described voltage output unit.
Preferably, described voltage applying unit comprises the first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube, wherein:
Two ports of alternating voltage described in the input termination of described first switching tube and second switch pipe, described first switching tube is connected with the control end of second switch pipe, and is connected to one end of described change-over switch, the other end ground connection of described change-over switch;
The control end of the 3rd switching tube and the 4th switching tube described in the output termination of described first switching tube, and connect the first resistance to ground, the output terminal of described second switch pipe connects the control end of described 5th switching tube and the 6th switching tube, and connects the second resistance to ground;
The input end of the 6th switching tube described in the output termination of described 3rd switching tube, and on the odd number of the described touch screen induction device received silver slurry lead-in wire, the output head grounding of described 6th switching tube; The input end of the 4th switching tube described in the output termination of described 5th switching tube, and receive on the even number silver slurry lead-in wire of described touch screen induction device, the output head grounding of described 4th switching tube; The input end of described 3rd switch and the 5th switching tube also accesses described DC voltage.
Preferably, described voltage output unit comprises the first diode, the 7th switching tube and the 8th switching tube, wherein:
The anode of described first diode connects described DC voltage, and negative electrode connects the input end of described 7th switching tube;
The output terminal of the second phase inverter described in the control termination of described 7th switching tube, the odd number silver slurry lead-in wire of touch screen induction device described in the output termination of described 7th switching tube;
The control end of described second phase inverter is by described change-over switch ground connection;
The even number silver slurry lead-in wire of touch screen induction device described in the input termination of described 8th switching tube, control the output terminal of the second phase inverter described in termination, the output terminal of described 8th switching tube by adjustable described reference resistance ground connection, and is used for detecting voltage described in output terminal as the output terminal of combined switch.
Preferably, also comprise the regulating filtering module providing the boosting adjustable module of adjustable dc voltage to be connected with this boosting adjustable module, described regulating filtering module exports described DC voltage.
Preferably, described boosting adjustable module comprises boost chip, the first electric capacity, the first inductance, the second diode, the first divider resistance and the second divider resistance, and described second divider resistance is adjustable resistance, wherein:
The power pins of described boost chip connects input power and by described first capacity earth, described first inductance is connected between the power pins of described boost chip and power switch output pin, the anode of described two diodes connects the power switch output pin of described boost chip, negative electrode connects the superpotential input pin of the input end of described regulating filtering module, one end of the first divider resistance and described boost chip, the feedback pin of boost chip described in another termination of described first divider resistance by described second divider resistance ground connection.
Preferably, described regulating filtering module comprises the second inductance and the second electric capacity, and the negative electrode of the first diode described in a termination of described second inductance is also by described second capacity earth, and the other end exports described DC voltage, and is linked into described combined switch.
Preferably, described voltage comparison module comprises operational amplifier, the second comparison amplifier, follows resistance and the 3rd electric capacity, wherein:
The normal phase input end of described operational amplifier connects described detection voltage, the output terminal that resistance connects described operational amplifier is followed described in the inverting input of described operational amplifier passes through, the output terminal of described operational amplifier is connected with the normal phase input end of described second comparison amplifier, and by described 3rd capacity earth, anti-phase input termination one reference voltage of described second comparison amplifier, indicating module described in the output termination of described second comparison amplifier.
Preferably, described indicating module comprises hummer and/or light emitting diode.
Above-mentioned touch screen induction device test circuit accurately test touch can shield the silver ion migration situation on inductor between adjacent circuit, the electrical condition of test can be adjusted, have dirigibility, wiring only needs two to go between or interface, has the advantages such as simple operability is high.
Accompanying drawing explanation
Fig. 1 is the module diagram of touch screen induction device test circuit in present pre-ferred embodiments;
Fig. 2 is the circuit theory diagrams of touch screen induction device test circuit in present pre-ferred embodiments.
Embodiment
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1 and Fig. 2, touch screen induction device test circuit in present pre-ferred embodiments, access DC voltage VPP.Touch screen induction device test circuit comprises first interface 101, second interface 102, combined switch 103, voltage comparison module 104, self-sustained oscillation module 105 and indicating module 106, upper for touch screen induction device (scheming not shown) odd number silver slurry lead-in wire 11, even number silver slurry lead-in wire 12 are connected to described combined switch by described first interface 101, second interface 102 respectively, described combined switch is connected with described DC voltage and voltage comparison module 104, and described self-sustained oscillation module 105 is input to described combined switch by after described converting direct-current voltage into alternating-current voltage.
Described combined switch is by described first interface 101 and the second interface 102 applies described alternating voltage and DC voltage detects to described touch screen induction device, rear output detections voltage compares to described voltage comparison module 104, described indicating module 106 presents the instruction whether silver slurry circuit the migration of silver slurry occurs, as sound and/or pilot lamp according to the comparative result of described voltage comparison module 104.
Touch screen induction device test circuit test silver slurry migration short-circuit conditions, apply alternating voltage by combined switch to the odd number connected between first interface 101 and the second interface 102 silver slurry lead-in wire 11 and even number silver slurry lead-in wire 12 to test, by combined switch, the resistance value (test voltage) between odd number silver slurry lead-in wire 11 and even number silver slurry lead-in wire 12 is switched to voltage comparison module 104 at any time during experiment and compares test, observation experiment situation and result.
Touch screen induction device test circuit also comprises the regulating filtering module 108 providing the boosting adjustable module 107 of adjustable dc voltage to be connected with this boosting adjustable module 107, and regulating filtering module 108 exports DC voltage VPP.
Boosting adjustable module 107 comprises boost chip IC1, the first electric capacity C1, the first inductance L 1, second diode D1, the first divider resistance R1 and the second divider resistance VR1, and the second divider resistance VR1 is adjustable resistance.
The power pins 6 of boost chip IC1 meets input power VIN and by the first electric capacity C1 ground connection, first inductance L 1 is connected between the power pins 6 of boost chip IC1 and power switch output pin 1, the anode of the second diode D1 connects the power switch output pin 1 of boost chip IC1, the negative electrode of the second diode D1 connect the input end of regulating filtering module 108, one end of the first divider resistance R1 and boost chip IC1 superpotential input pin 5, first divider resistance R1 another termination boost chip IC1 feedback pin 3 and by the second divider resistance VR1 ground connection.Regulate the second divider resistance VR1 boosting adjustable module 107 to export adjustable DC voltage, voltage is adjustable at 3.3V-30V.
Regulating filtering module 108 comprises the second inductance L 2 and the second electric capacity C2, and the negative electrode of a termination second diode D1 of the second inductance L 2 is also by the second electric capacity C2 ground connection, and the other end exports DC voltage VPP, and is linked into combined switch 103.
Reference voltage VREF is the voltage of input power VIN after the first electric capacity C1 bypass decoupling.In other embodiments, external DC voltage VPP and reference voltage VREF can be used.
Self-sustained oscillation module 105 comprises self-excited oscillator 1051, first comparison amplifier IC5 and the first phase inverter 1052, and described self-excited oscillator 1051 output terminal sine wave output is to the normal phase input end 3PIN of described first comparison amplifier IC5, the inverting input 2PIN of described first comparison amplifier IC5 accesses a reference voltage VREF, the output terminal 6PIN of the first comparison amplifier IC5 connects the control end of the first phase inverter 1052, DC voltage VPP described in the input termination of the first phase inverter 1052, the output terminal 6PIN of described first comparison amplifier IC5 is set to the first output node 91 of described self-sustained oscillation module 105, what the output terminal of the first phase inverter 1052 was set to described self-sustained oscillation module 105 is the second output node 92 that the first output node 91 output level is contrary with described, first output node 91 of described self-sustained oscillation module 105 and the second output node 92 export described alternating voltage.
Self-excited oscillator 1051 comprises the first operational amplifier IC4, between the inverting input 2PIN of the first operational amplifier IC4 and ground, crosstalk hinders R10, go here and there between inverting input 2PIN and output terminal 6PIN and follow resistance R11, divider resistance R12 is in parallel with electric capacity of voltage regulation C7 to go here and there between the normal phase input end 3PIN and ground of the first operational amplifier IC4.Current-limiting resistance R13 connects with adjustable resistance VR3, more in parallel with current-limiting resistance R14, the combination of composition adjustable resistance, then between the normal phase input end 3PIN being connected to the first operational amplifier IC4 after connecting with electric capacity C8 and output terminal 6PIN.A positive feedback passage is formed between the normal phase input end 3PIN of such first operational amplifier IC4 and output terminal 6PIN, make circuit self-sustained oscillation, at the output terminal 6PIN sine wave output of the first operational amplifier IC4, sinusoidal wave frequency adjusts by adjustable resistance VR3.The output terminal 6PIN of the first operational amplifier IC4 is connected with the normal phase input end 3PIN of the first comparison amplifier IC5, the inverting input 2PIN of the first comparison amplifier IC5 is connected between divider resistance R15 and divider resistance R16, and divider resistance R15 and divider resistance R16 is composed in series a bleeder circuit.First comparison amplifier IC5 is one and compares type operational amplifier, when the output terminal 6PIN voltage of the first operational amplifier IC4 is higher than the inverting input 2PIN voltage of the first comparison amplifier IC5, the output terminal 6PIN of the first comparison amplifier IC5 exports high level, separately when inverting input 2PIN voltage less than or equal to the first comparison amplifier IC5 of the output terminal 6PIN voltage of the first operational amplifier IC4, the output terminal 6PIN output low level of the first comparison amplifier IC5.
First phase inverter 1052 comprises transistor T0, pull-up resistor R9 and resistance R8, transistor T0 grid is as the first phase inverter 1052 control end (i.e. the first output node 91), VPP is connected by pull-up resistor R9, the source electrode of transistor T0 is as the output terminal (i.e. the second output node 92) of the first phase inverter 1052, VPP is connected, the grounded drain of transistor T0 by pull-up resistor R8.Such transistor T0 and R8, R9 purchase into a phase inverter, when transistor T0 grid (the first output node 91) node is low level, transistor T0 transistor is in cut-off state, the source electrode (the second output node 92) of transistor T0 exports high level, otherwise when transistor T0 grid (the first output node 91) is for high level, transistor T0 transistor is in conducting state, source electrode (the second output node 92) the node output low level of transistor T0.
Preferably, described combined switch 103 comprises voltage applying unit 1031, voltage output unit 1032, second phase inverter 1033, reference resistance VR2 and change-over switch 1034, described change-over switch 1034 is connected with described voltage applying unit 1031, described change-over switch 1034 is connected with described voltage output unit 1032 by described second phase inverter 1033, and the output terminal of described voltage output unit 1032 is passed through described reference resistance VR2 ground connection by described voltage applying unit 1031;
Described alternating voltage for accessing described alternating voltage, and is linked on described touch screen induction device by described voltage applying unit 1031; Described DC voltage VPP, for accessing described DC voltage VPP, is linked into the described detection voltage Vx of output after on described touch screen induction device by change-over switch 1034 by described voltage output unit 1032.
Preferably, voltage applying unit 1031 comprises the first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switch transistor T 6.
Two ports of alternating voltage described in the input termination of described first switch transistor T 1 and second switch pipe T2, namely the first above-mentioned output node 91 and the second output node 92, described first switch transistor T 1 is connected with the control end of second switch pipe T2, and be connected to one end of described change-over switch 1034, the other end ground connection of described change-over switch 1034.
The control end of the 3rd switch transistor T 3 and the 4th switch transistor T 4 described in the output termination of described first switch transistor T 1, and connecting resistance R18 is to ground, the output terminal of described second switch pipe T2 connects the control end of described 5th switch transistor T 5 and the 6th switch transistor T 6, and connecting resistance R17 is to ground.
The input end of the 6th switch transistor T 6 described in the output termination of described 3rd switch transistor T 3, and on the odd number of the described touch screen induction device received silver slurry lead-in wire 11, the output head grounding of described 6th switch transistor T 6; The input end of the 4th switch transistor T 4 described in the output termination of described 5th switch transistor T 5, and receive on the even number silver slurry lead-in wire 12 of described touch screen induction device, the output head grounding of described 4th switch transistor T 4; The input end of described 3rd switch and the 5th switch transistor T 5 also accesses described DC voltage.
Voltage output unit 1032 comprises the first diode D2, the 7th switch transistor T 7 and the 8th switch transistor T 8.
The anode of described first diode D2 connects described DC voltage, and negative electrode connects the input end of described 7th switch transistor T 7; The output terminal of the second phase inverter 1033 described in the control termination of described 7th switch transistor T 7, the odd number silver slurry lead-in wire 11 of touch screen induction device described in the output termination of described 7th switch transistor T 7; The control end of described second phase inverter 1033 is by described change-over switch 1034 ground connection; The even number silver slurry lead-in wire 12 of touch screen induction device described in the input termination of described 8th switch transistor T 8, control the output terminal of the second phase inverter 1033 described in termination, the output terminal of described 8th switch transistor T 8 by adjustable described reference resistance VR2 ground connection, and is used for detecting voltage Vx described in output terminal as the output terminal of combined switch 103.
In the present embodiment, change-over switch 1034 is pressing K switch 1.Second phase inverter 1033 comprises switch transistor T 10, pull-up resistor R2 and current-limiting resistance R3, the control end of switch transistor T 10 is that the input end of phase inverter 1033 is by change-over switch 1034 ground connection, and the control end of switch transistor T 10 meets reference voltage VREF by pull-up resistor R2, the control end of input termination the 8th switch transistor T 8 of switch transistor T 10 and the control end of the 7th switch transistor T 7, also meet reference voltage VREF by current-limiting resistance R3, the output head grounding of switch transistor T 10.
In the present embodiment, switch transistor T 0, first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5, the 6th switch transistor T 6, the 7th switch transistor T 7, the 8th switch transistor T 8 and switch transistor T 10 are n type field effect transistor.The input end of switching tube, output terminal, control end are respectively the source electrode of field effect transistor, drain electrode, grid.In other embodiments, switching tube can use metal-oxide-semiconductor or triode to replace.
Voltage comparison module 104 comprises operational amplifier IC2, the second comparison amplifier IC3, follows resistance R4, the 3rd divider resistance R5, the 4th divider resistance R6, the 3rd electric capacity C3 and the 4th electric capacity C4.
The normal phase input end 3PIN of operational amplifier IC2 connects and detects voltage Vx, the inverting input 2PIN of operational amplifier IC2 meets the output terminal 6PIN of operational amplifier IC2 by following resistance R4, the output terminal 6PIN of operational amplifier IC2 is connected with the normal phase input end 3PIN of the second comparison amplifier IC3, and by the 3rd electric capacity C3 ground connection, the inverting input 2PIN of the second comparison amplifier IC3 connects a reference voltage (i.e. reference voltage VREF) by the 3rd divider resistance R5, by the 4th divider resistance R6 ground connection, and by the 4th electric capacity C4 ground connection, the output termination indicating module 106 of comparison amplifier IC4.
The circuit working principle of touch screen induction device test circuit:
Circuit working principle: boost chip IC1 meets input power VIN, 2PIN ground connection with reference to the 6PIN of model MP1518, boost chip IC1, and the bypass decoupling electric capacity that the first electric capacity C1 is used for boost chip IC1 stablizes input voltage.First inductance L 1 is connected between 6PIN and 1PIN of boost chip IC1, for stored energy of boosting.First diode D1 is used for voltage commutation.Second electric capacity C2 is for adjustable module 107 output filtering that boosts.Access the 3PIN of boost chip IC1 for boost feedback after first divider resistance R1 and the second divider resistance VR1 dividing potential drop, the size of output voltage can be adjusted by the adjustment of the second divider resistance VR1.The 5PIN of boost chip IC1 is used for overvoltage protection.The 4PIN of boost chip IC1 is the enable pin of IC, and connecing high level is IC normal operating conditions.The 1PIN of boost chip IC1 can export square-wave signal makes the first inductance L 1 charging and discharging to produce high pressure, through the first diode D1 rectification, and the DC voltage VPP of stable output after the low-pass filter circuit that connection second electric capacity C2 and the second inductance L 2 form.Input voltage VREF as the reference voltage after the first electric capacity C1 filtering.
First output terminal node 91 of AC power connects the source electrode of the first switch transistor T 1, second output terminal node 92 of alternating voltage connects the source electrode of second switch pipe T2, first switch transistor T 1 is connected with the grid of second switch pipe T2, and is connected to one end of pressing K switch 1.
When pressing K switch 1 and not pressing, due to the effect of pull-up resistor R2 pull-up, the grid of the first switch transistor T 1 and second switch pipe T2 is high level, therefore the first switch transistor T 1 and second switch pipe T2 can conductings.When the first output terminal node 91 of AC power is low level, 3rd switch transistor T 3 and the 4th switch transistor T 4 transistor cutoff, now the second output terminal node 92 of alternating voltage exports high level, second switch pipe T2 is now as conducting, the grid of the 5th switch transistor T 5 and the 6th switch transistor T 6 is high level, 5th switch transistor T 5 and the 6th switch transistor T 6 conducting, DC voltage vpp voltage is through the 5th switch transistor T 5-even number silver slurry lead-in wire 12-odd number silver slurry lead-in wire 11-the 6th switch transistor T 6, finally arrive ground, be equivalent to directly provide one close to the voltage of DC voltage VPP between the even number silver slurry lead-in wire 12-odd number silver slurry lead-in wire 11 of product to be measured.
Otherwise, when the first output terminal node 91 of AC power is high level, second output terminal node 92 output low level of alternating voltage, 5th switch transistor T 5 and the 6th switch transistor T 6 are ended, now second switch pipe T2 is as conducting, the grid of the 3rd switch transistor T 3 and the 4th switch transistor T 4 is high level, 3rd switch transistor T 3 and the 4th switch transistor T 4 conducting, DC voltage vpp voltage is through the 3rd switch transistor T 3-odd number silver slurry lead-in wire 11-even number silver slurry lead-in wire 12-the 4th switch transistor T 4, finally arrive ground, be equivalent to provide one close to the voltage of DC voltage VPP between the odd number silver slurry lead-in wire 11-even number silver slurry lead-in wire 12 of product to be measured.Like this, under the driving of self-excited oscillator 1051, DC voltage vpp voltage forward and reverse being carried between odd number silver slurry lead-in wire 11 and even number silver slurry lead-in wire 12, be equivalent to have the voltage replaced, i.e. an alternating voltage between odd number silver slurry lead-in wire 11 and even number silver slurry lead-in wire 12.
The grid of switch transistor T 10 connects pressing K switch 1, and connects DC voltage VPP by pull-up resistor R2, and switch transistor T 10 source electrode connects DC voltage VPP by resistance R3, grounded drain.When pressing K switch 1 and not pressing, the grid voltage of switch transistor T 10 is in high level due to pull-up resistor R2, can make the first switch transistor T 1 and second switch pipe T2 conducting like this.The now source electrode output low level of switch transistor T 10, the source electrode of switch transistor T 10 is connected on the grid of the 7th switch transistor T 7 and the 8th switch transistor T 8, and the 7th switch transistor T 7 and the 8th switch transistor T 8 are ended.When pressing K switch 1 and pressing, first switch transistor T 1 and second switch pipe T2 end, the grid of the 3rd switch transistor T 3, the 5th switch transistor T 5, the 6th switch transistor T 6, the 4th switch transistor T 4 also all ends under the drop-down effect of resistance R17 and R18, now the 7th switch transistor T 7 and the 8th switch transistor T 8 conducting, Gu DC voltage vpp voltage goes between, ground connection after the 8th switch transistor T 8 and VR2 to the silver slurry of product to be measured through D3, the 7th switch transistor T 7.So when pressing K switch 1 and pressing, be equivalent to product resistance to be measured and reference resistance VR2 forms a bleeder circuit, reference resistance VR2 can finely tune according to actual conditions.
Obtain after reference resistance VR2 dividing potential drop detecting voltage Vx through C6 voltage regulation filtering, be linked into the normal phase input end 3PIN of operational amplifier IC2, be connected by a resistance R4 between the inverting input 2PIN of operational amplifier IC2 and output terminal 6PIN, form a voltage follower, make the output terminal 6PIN voltage of operational amplifier IC2 equal the normal phase input end 3PIN voltage of operational amplifier IC2.Voltage is connected with the normal phase input end 3PIN of comparison amplifier IC3 after C3 voltage stabilizing, and comparison amplifier IC3 is comparison amplifier.Reference voltage VREF accesses the inverting input 2PIN of comparison amplifier IC3 after R5 and R6 dividing potential drop and C4 voltage stabilizing, if the inverting input 2PIN voltage of comparison amplifier IC3 is higher than the normal phase input end 3PIN voltage of comparison amplifier IC3, the output terminal 6PIN of comparison amplifier IC3 exports high level, if the inverting input 2PIN voltage of comparison amplifier IC3 is less than or equal to the output terminal 6PIN output low level of the normal phase input end 3PIN of comparison amplifier IC3, comparison amplifier IC3.The output terminal 6PIN of comparison amplifier IC3 connects electric capacity of voltage regulation C5, and connects current-limiting resistance R7, R7 connecting luminous diode D4, and in the present invention, D4 can substitute with hummer, is used to indicate experimental status and result.
If there is not the migration of silver slurry in experiment product, resistance Rx between odd number silver slurry lead-in wire 11 and even number silver slurry lead-in wire 12 can be larger, at more than 1M, the resistance value of adjustable resistance VR1 is less, as 100K, the voltage of the normal phase input end 3PIN of access operational amplifier IC2 is about Vx=VR1/ (VR1+Rx) * VREF, due to Rx>>VR1, the normal phase input end 3PIN voltage of such operational amplifier IC2 is close to 0V, the normal phase input end 3PIN voltage of comparison amplifier IC3 is arrived also close to 0V after voltage follower, make the normal phase input end 3PIN voltage of comparison amplifier IC3 can be less than the inverting input 2PIN voltage of comparison amplifier IC3, thus the output terminal 6PIN of comparison amplifier IC3, output low level, D4 light emitting diode is not luminous.
If there is the migration of silver slurry in experiment product, resistance Rx between odd number silver slurry lead-in wire 11 and even number silver slurry lead-in wire 12 can diminish, within 100K, the voltage of the normal phase input end 3PIN of access operational amplifier IC2 is about Vx=VR1/ (VR1+Rx) * VREF, the normal phase input end 3PIN voltage of such operational amplifier IC2 is close to 0.5*VREF, the normal phase input end 3PIN voltage of comparison amplifier IC3 is arrived also close to 0.5*VREF after voltage follower, the inverting input 2PIN voltage of comparison amplifier IC3 is through the dividing potential drop of R5 and R6, be set to 0.2*REF, the normal phase input end 3PIN voltage of comparison amplifier IC3 is made to be greater than the inverting input 2PIN voltage of comparison amplifier IC3, thus the output terminal 6PIN of comparison amplifier IC3, export high level, D4 lumination of light emitting diode.
Above-mentioned touch screen induction device test circuit accurately test touch can shield the silver ion migration situation on inductor between adjacent circuit, the electrical condition of test can be adjusted, have dirigibility, wiring only needs two to go between or interface, has the advantages such as simple operability is high.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a touch screen induction device test circuit, access DC voltage, it is characterized in that, comprise first interface, the second interface, self-sustained oscillation module, combined switch, voltage comparison module and indicating module, odd number silver slurry lead-in wire, even number silver slurry lead-in wire on touch screen induction device are connected to described combined switch by described first interface, the second interface respectively, described combined switch is connected with described DC voltage and voltage comparison module, and described self-sustained oscillation module is input to described combined switch by after described converting direct-current voltage into alternating-current voltage;
Described combined switch applies described alternating voltage by described first interface and the second interface and DC voltage detects to described touch screen induction device, rear output detections voltage compares to described voltage comparison module, and described indicating module presents according to the comparative result of described voltage comparison module the instruction whether silver slurry circuit the migration of silver slurry occurs.
2. touch screen induction device test circuit as claimed in claim 1, it is characterized in that, described self-sustained oscillation module comprises self-excited oscillator, the first comparison amplifier and the first phase inverter, and described self-excited oscillator output terminal sine wave output is to the normal phase input end of described first comparison amplifier; The inverting input of described first comparison amplifier accesses a reference voltage, export the control end of phase inverter described in termination, DC voltage described in the input termination of described first phase inverter, the output terminal of described first comparison amplifier is set to the first output node of described self-sustained oscillation module, the output terminal of described first phase inverter is set to second output node contrary with described first output node output level of described self-sustained oscillation module, and the first output node and second output node of described self-sustained oscillation module export described alternating voltage.
3. touch screen induction device test circuit as claimed in claim 1 or 2, it is characterized in that, described combined switch comprises voltage applying unit, voltage output unit, the second phase inverter, reference resistance and change-over switch, described change-over switch is connected with described voltage applying unit, described change-over switch is connected with described voltage output unit by described second phase inverter, and the output terminal of described voltage output unit is passed through described reference resistance ground connection by described voltage applying unit;
Described alternating voltage for accessing described alternating voltage, and is linked on described touch screen induction device by described voltage applying unit; Described DC voltage, for accessing described DC voltage, is linked into the described detection voltage of output after on described touch screen induction device by change-over switch by described voltage output unit.
4. touch screen induction device test circuit as claimed in claim 3, it is characterized in that, described voltage applying unit comprises the first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube, wherein:
Two ports of alternating voltage described in the input termination of described first switching tube and second switch pipe, described first switching tube is connected with the control end of second switch pipe, and is connected to one end of described change-over switch, the other end ground connection of described change-over switch;
The control end of the 3rd switching tube and the 4th switching tube described in the output termination of described first switching tube, and connect the first resistance to ground, the output terminal of described second switch pipe connects the control end of described 5th switching tube and the 6th switching tube, and connects the second resistance to ground;
The input end of the 6th switching tube described in the output termination of described 3rd switching tube, and on the odd number of the described touch screen induction device received silver slurry lead-in wire, the output head grounding of described 6th switching tube; The input end of the 4th switching tube described in the output termination of described 5th switching tube, and receive on the even number silver slurry lead-in wire of described touch screen induction device, the output head grounding of described 4th switching tube; The input end of described 3rd switch and the 5th switching tube also accesses described DC voltage.
5. touch screen induction device test circuit as claimed in claim 3, it is characterized in that, described voltage output unit comprises the first diode, the 7th switching tube and the 8th switching tube, wherein:
The anode of described first diode connects described DC voltage, and negative electrode connects the input end of described 7th switching tube;
The output terminal of the second phase inverter described in the control termination of described 7th switching tube, the odd number silver slurry lead-in wire of touch screen induction device described in the output termination of described 7th switching tube;
The control end of described second phase inverter is by described change-over switch ground connection;
The even number silver slurry lead-in wire of touch screen induction device described in the input termination of described 8th switching tube, control the output terminal of the second phase inverter described in termination, the output terminal of described 8th switching tube by adjustable described reference resistance ground connection, and is used for detecting voltage described in output terminal as the output terminal of combined switch.
6. touch screen induction device test circuit as claimed in claim 1 or 2, it is characterized in that, also comprise the regulating filtering module providing the boosting adjustable module of adjustable dc voltage to be connected with this boosting adjustable module, described regulating filtering module exports described DC voltage.
7. touch screen induction device test circuit as claimed in claim 6, it is characterized in that, described boosting adjustable module comprises boost chip, the first electric capacity, the first inductance, the second diode, the first divider resistance and the second divider resistance, and described second divider resistance is adjustable resistance, wherein:
The power pins of described boost chip connects input power and by described first capacity earth, described first inductance is connected between the power pins of described boost chip and power switch output pin, the anode of described two diodes connects the power switch output pin of described boost chip, negative electrode connects the superpotential input pin of the input end of described regulating filtering module, one end of the first divider resistance and described boost chip, the feedback pin of boost chip described in another termination of described first divider resistance by described second divider resistance ground connection.
8. touch screen induction device test circuit as claimed in claim 7, it is characterized in that, described regulating filtering module comprises the second inductance and the second electric capacity, the negative electrode of the first diode described in one termination of described second inductance is also by described second capacity earth, the other end exports described DC voltage, and is linked into described combined switch.
9. touch screen induction device test circuit as claimed in claim 1 or 2, it is characterized in that, described voltage comparison module comprises operational amplifier, the second comparison amplifier, follows resistance and the 3rd electric capacity, wherein:
The normal phase input end of described operational amplifier connects described detection voltage, the output terminal that resistance connects described operational amplifier is followed described in the inverting input of described operational amplifier passes through, the output terminal of described operational amplifier is connected with the normal phase input end of described second comparison amplifier, and by described 3rd capacity earth, anti-phase input termination one reference voltage of described second comparison amplifier, indicating module described in the output termination of described second comparison amplifier.
10. touch screen induction device test circuit as claimed in claim 1, it is characterized in that, described indicating module comprises hummer and/or light emitting diode.
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| CN201510632116.1A CN105158616B (en) | 2015-09-29 | 2015-09-29 | A kind of touch screen induction device test circuit |
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| CN201510632116.1A CN105158616B (en) | 2015-09-29 | 2015-09-29 | A kind of touch screen induction device test circuit |
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Cited By (1)
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| CN106847141A (en) * | 2016-12-29 | 2017-06-13 | 深圳市宇顺电子股份有限公司 | A kind of display screen test circuit |
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