CN205160405U - Drive and control circuit and have piezoelectricity injection valve of this circuit - Google Patents
Drive and control circuit and have piezoelectricity injection valve of this circuit Download PDFInfo
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- CN205160405U CN205160405U CN201520849200.4U CN201520849200U CN205160405U CN 205160405 U CN205160405 U CN 205160405U CN 201520849200 U CN201520849200 U CN 201520849200U CN 205160405 U CN205160405 U CN 205160405U
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Abstract
The utility model discloses a drive and control circuit and have piezoelectricity injection valve of this circuit belongs to and a little glues technical field, drive and control circuit includes power module, control module, first and second power devices, the output of first and second power devices is used for the drive to connect the piezoceramics piece that sets up in pairs on the piezoelectricity injection valve respectively, control module's an output is connected simultaneously the input of first and second power devices, be provided with an optical coupler between control module's the output and the input of first power device, be provided with the 2nd optical coupler between control module's the output and the input of second power device, an optical coupler and the 2nd optical coupler work under height, low level respectively. Compared with the prior art, the utility model has the characteristics of fast, the precision is high.
Description
Technical field
The utility model relates to dispensing technology, refers to a kind of Drive and Control Circuit especially and has the piezo jet valve of this circuit.
Background technology
Fluid dispensing technology is a key technology in the fields such as microelectronics Packaging, and this technology is converted into the non-contact type point glue mode of the increasingly automated operation of energy just gradually from traditional contact point glue mode.The device that typical non-contact type dispensing technology adopts comprises mechanical injection valve and piezo jet valve, wherein, mechanical injection valve develops based on the principle of electro-pneumatic, complex structure, piezo jet valve is then the fluid point glue equipment utilizing the inverse piezoelectric effect of piezoelectric to design, it has the advantages that structure is simple, injection frequency is high, and the glue point that piezo jet valve sprays can be little of um level, very high precision can be reached in glue spraying process, therefore, being widely used in a glue field of piezo jet valve.
At present, in the driving of the piezo jet valve of prior art, in order to drive piezo jet valve glue dispensing valve, control mode adopts control module to produce two-way rp pulse drive singal control two-way power device and (usually adopts MOSFET (Metal-Oxide-SemiconductorField-EffectTransistor, Metal-Oxide Semiconductor field-effect transistor)) alternately for the piezoelectric ceramic piece that piezo jet valve is arranged in pairs is powered, realize a glue and control.In this some glue mode, due to the factor such as delay and interference of circuit components, easily cross-over control is there is in the two-way rp pulse drive singal that control module produces when synchronous, therefore, often add Dead Time to avoid this phenomenon, but, when putting at a high speed glue, adding the delay that Dead Time brings can make a glue speed, precision reduce, Influential cases glue effect.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of speed is fast, precision is high Drive and Control Circuit and has the piezo jet valve of this circuit.
For solving the problems of the technologies described above, the utility model provides technical scheme as follows:
A kind of Drive and Control Circuit, comprise power module, control module, first and second power devices, the output of described first and second power devices is respectively used to drive the piezoelectric ceramic piece connecting and piezo jet valve is arranged in pairs, an output of described control module connects the input of described first and second power devices simultaneously, the first optical coupler is provided with between the output of described control module and the input of the first power device, the second optical coupler is provided with between the output of described control module and the input of the second power device, described first optical coupler and the second optical coupler are respectively at height, work under low level.
Further, the positive pole of the interior light emitting diodes of described first optical coupler connects the output of described control module, the minus earth of the interior light emitting diodes of described first optical coupler;
The positive pole of the interior light emitting diodes of described second optical coupler connects positive source, and the negative pole of the interior light emitting diodes of described second optical coupler connects the output of described control module.
Further, the first voltage stabilizing didoe is provided with between the positive pole of the interior light emitting diodes of described first optical coupler and the output of described control module;
The second voltage stabilizing didoe is provided with between the negative pole of the interior light emitting diodes of described second optical coupler and the output of described control module.
Further, described first power device and the second power device are respectively a MOSFET and the 2nd MOSFET, wherein:
The grid of a described MOSFET connects the output of described first optical coupler, the drain electrode of a described MOSFET connects positive source, source electrode and the grid of a described MOSFET are connected the drain electrode of described 2nd MOSFET respectively after resistance, and drain electrode and the drain electrode of described 2nd MOSFET of a described MOSFET are respectively used to drive the two ends of a piezoelectric ceramic piece in the piezoelectric ceramic piece being connected setting in pairs on piezo jet valve;
The grid of described 2nd MOSFET connects the output of described second optical coupler, the source electrode of described 2nd MOSFET and grid ground connection after resistance respectively, drain electrode and the ground of described 2nd MOSFET of described 2nd MOSFET are respectively used to drive the two ends of another piezoelectric ceramic piece in the piezoelectric ceramic piece being connected setting in pairs on piezo jet valve.
Further, described Drive and Control Circuit also comprises the first constant-current source discharge loop and/or the second constant-current source discharge loop, described first constant-current source discharge loop comprises the first slide rheostat, the first operational amplifier and the 3rd MOSFET, described second constant-current source discharge loop comprises the second slide rheostat, the second operational amplifier and the 4th MOSFET, wherein:
The two ends of described first slide rheostat connect positive source and ground respectively, the sliding end of described first slide rheostat connects the in-phase input end of described first operational amplifier after resistance, the output of described first operational amplifier connects the grid of described 3rd MOSFET, the inverting input of described first operational amplifier connects the source electrode of described 3rd MOSFET after resistance, electric capacity is connected with between the in-phase input end of described first operational amplifier and output, source electrode ground connection after resistance of described 3rd MOSFET, drain electrode and the source electrode of described 3rd MOSFET are respectively used to be connected the two ends of a piezoelectric ceramic piece in the piezoelectric ceramic piece that piezo jet valve is arranged in pairs,
The two ends of described second slide rheostat connect positive source and ground respectively, the sliding end of described second slide rheostat connects the in-phase input end of described second operational amplifier after resistance, the output of described second operational amplifier connects the grid of described 4th MOSFET, the inverting input of described second operational amplifier connects the source electrode of described 4th MOSFET after resistance, electric capacity is connected with between the in-phase input end of described second operational amplifier and output, source electrode ground connection after resistance of described 4th MOSFET, drain electrode and the source electrode of described 4th MOSFET are respectively used to be connected the two ends of another piezoelectric ceramic piece in the piezoelectric ceramic piece that piezo jet valve is arranged in pairs.
Further; described Drive and Control Circuit also comprises the first output protection module and/or the second output protection module; described first output protection module comprises the first optical coupling isolator and the first computing comparator; described second output protection module comprises the second optical coupling isolator and the second computing comparator, wherein:
Two inputs of described first optical coupling isolator connect the source electrode of a described MOSFET and the drain electrode of described 2nd MOSFET respectively, the cathode output end of described first optical coupling isolator connects positive source, cathode output end connects the inverting input of described first computing comparator, the in-phase input end of described first computing comparator is connected with the first reference voltage, and the output of described first computing comparator connects the grid of a described MOSFET;
Two inputs of described second optical coupling isolator connect the source electrode of described 2nd MOSFET and the ground of described 2nd MOSFET respectively, the cathode output end of described second optical coupling isolator connects positive source, cathode output end connects the inverting input of described second computing comparator, the in-phase input end of described second computing comparator is connected with the second reference voltage, and the output of described second computing comparator connects the grid of described 2nd MOSFET.
Further, described control module is also connected with and controls button and liquid crystal display.
Further, described power module comprise D/A converter, integrated pulse width modulation chip, two recommend triode, DC-DC transformer, rectification circuit and filter circuit, wherein:
The input of described D/A converter connects the output of described control module, and the output of described D/A converter connects the input of described integrated pulse width modulation chip;
The output of described integrated pulse width modulation chip connects described two respectively and recommends in the base stage of triode;
Ground connection after described two emitters of recommending triode are connected;
Described DC-DC transformer is three input two output transformers, described two collector electrodes of recommending triode connect the input at the two ends of described DC-DC transformer respectively, the intermediate input termination power positive pole ground connection after electric capacity simultaneously of described DC-DC transformer, the output of described DC-DC transformer exports the direct voltage after boosting after described rectification circuit and filter circuit.
A kind of piezo jet valve, comprises above-mentioned Drive and Control Circuit.
Further, described piezo jet valve also comprises fluid heating control module, and described fluid heating control module comprises temperature collect module and carries out the heater switch circuit that heats for convection cell, wherein:
The output of described temperature collect module is connected with the input of described control module;
The input of described heater switch circuit is connected with the output of described control module, and the output of described heater switch circuit is for connecting DC heating rod.
The utility model has following beneficial effect:
Drive and Control Circuit of the present utility model, adopt an output of control module to connect the input of described first and second power devices simultaneously, avoid in prior art, two outputs of control module are adopted to drive the first and second power devices respectively, and need the situation adding dead band, make the utility model can not produce the time delay brought owing to adding Dead Time, this improves actuating speed of the present utility model and control precision.The first optical coupler in the utility model and the second optical coupler adopt the structural design oppositely exporting high and low level, namely when the first optical coupler exports high level, second optical coupler can only output low level, when the second optical coupler exports high level, first optical coupler can only output low level, the first and second power devices of the present utility model are made to there will not be the situation of conducting simultaneously, ensure that operation stability of the present utility model, in addition, the switching rate of optical coupler is very fast, further increases actuating speed of the present utility model.Compared with prior art, the utility model has the advantages that speed is fast, precision is high.
Accompanying drawing explanation
Fig. 1 is the structural representation one of Drive and Control Circuit of the present utility model;
Fig. 2 is the structural representation two of Drive and Control Circuit of the present utility model;
Fig. 3 is the structural representation three of Drive and Control Circuit of the present utility model;
Fig. 4 is the structural representation four of Drive and Control Circuit of the present utility model;
Fig. 5 a-5b is the structural representation of the first and second constant-current source discharge loops of Drive and Control Circuit of the present utility model;
Fig. 6 a-6b is the structural representation of the first and second output protection modules of Drive and Control Circuit of the present utility model;
Fig. 7 is the structural representation of the power module of Drive and Control Circuit of the present utility model;
Fig. 8 is the structural representation of the fluid heating control module of piezo jet valve of the present utility model.
Embodiment
For making the technical problems to be solved in the utility model, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
On the one hand, the utility model provides a kind of Drive and Control Circuit, as shown in Figure 1, comprise power module, control module 1, first power device 21 and the second power device 22, first power device 21 and the output of the second power device 22 are respectively used to drive the piezoelectric ceramic piece being connected and piezo jet valve is arranged in pairs, an output of control module 1 connects the input of the first power device 21 and the second power device 22 simultaneously, the first optical coupler 31 is provided with between the output of control module 1 and the input of the first power device 21, the second optical coupler 32 is provided with between the output of control module 1 and the input of the second power device 22, first optical coupler 31 and the second optical coupler 32 are respectively at height, work under low level.
Drive and Control Circuit of the present utility model, adopt an output of control module 1 to connect the input of the first power device 21 and the second power device 22 simultaneously, avoid in prior art, two outputs of control module 1 are adopted to drive the first power device 21 and the second power device 22 respectively, and need the situation adding dead band, make the utility model can not produce the time delay brought owing to adding Dead Time, this improves actuating speed of the present utility model and control precision.The first optical coupler 31 in the utility model and the second optical coupler 32 adopt oppositely output high, low level structural design, namely when the first optical coupler 31 exports high level, second optical coupler 32 can only output low level, when the second optical coupler 32 exports high level, first optical coupler 31 can only output low level, the first power device 21 of the present utility model and the second power device 22 is made to there will not be the situation of conducting simultaneously, ensure that operation stability of the present utility model, in addition, the switching rate of optical coupler is very fast, further increase actuating speed of the present utility model.Compared with prior art, the utility model has the advantages that speed is fast, precision is high.
Improve as one of the present utility model, as shown in Figure 2, the output of the positive pole link control module 1 of the interior light emitting diodes of the first optical coupler 31, the minus earth of the interior light emitting diodes of the first optical coupler 31;
The positive pole of the interior light emitting diodes of the second optical coupler 32 connects positive source, the output of the negative pole link control module 1 of the interior light emitting diodes of the second optical coupler 32.
In the utility model, when the output of control module 1 exports high level, electrical potential difference is produced between the positive pole of the interior light emitting diodes of the first optical coupler 31 and negative pole, the interior light emitting diodes of the first optical coupler 31 is made to have electric current to flow through, then the first optical coupler 31 conducting, now, the electrical potential difference between the positive pole negative pole of the interior light emitting diodes of the second optical coupler 32 is 0 or is not enough to make the interior light emitting diodes conducting of the second optical coupler 32, then the second optical coupler 32 turns off; When the output output low level of control module 1, electrical potential difference between the positive pole of the interior light emitting diodes of the first optical coupler 31 and negative pole is 0 or is not enough to make the interior light emitting diodes conducting of the first optical coupler 31, then the first optical coupler 31 turns off, now, generation electrical potential difference between the positive pole of the interior light emitting diodes of the second optical coupler 32 and negative pole, the interior light emitting diodes of the second optical coupler 32 is made to have electric current to flow through, then the second optical coupler 32 conducting.In the utility model, no matter what the output of control module 1 exported is high level or low level, first optical coupler 31 and the second optical coupler 32 are all alternate conduction, compared with prior art, the utility model does not relate to the situation adding Dead Time, therefore, actuating speed of the present utility model is improved significantly.
As further improvement of the utility model, as shown in Figure 3, the first voltage stabilizing didoe 41 is provided with between the positive pole of the interior light emitting diodes of the first optical coupler 31 and the output of control module 1;
The second voltage stabilizing didoe 42 is provided with between the negative pole of the interior light emitting diodes of the second optical coupler 32 and the output of control module 1.
In the utility model, can according to the output voltage of control module 1, and first forward voltage drop of optical coupler 31 and the second optical coupler 32, the model of the first voltage stabilizing didoe 41 and the second voltage stabilizing didoe 42 is selected, thus make the first optical coupler 31 and the second optical coupler 32 can be operated in normal operating state, in order to avoid damage the first optical coupler 31 and/or the second optical coupler 32.
In the utility model; in order to realize the protection to control module 1; the output of control module 1 can first be connected with the input of the first optical coupler 31 and the second optical coupler 32 through an optocoupler again; this makes it possible to control module 1 is kept apart with drive circuit below; when drive circuit short circuit; or power component breakdown time, the damage of control module 1 can not be caused.In the utility model, preferably, control module 1 adopts model to be the single-chip microcomputer of MSP320F149, and the first optical coupler 31 and the second optical coupler 32 all adopt TLP250, and optocoupler adopts TLP251.
In the utility model, as shown in Figure 4, because MOSFET has the advantages such as speed is fast, volume is little, be most widely used in middle low power drive circuit, and performance is best, therefore the first power device 21 of the present utility model and the second power device 22 adopt a MOSFET and the 2nd MOSFET respectively, wherein:
The grid of the one MOSFET connects the output of the first optical coupler 31, the drain electrode of the one MOSFET connects positive source, source electrode and the grid of the one MOSFET are connected the drain electrode of the 2nd MOSFET respectively after resistance, and drain electrode and the drain electrode of the 2nd MOSFET of a MOSFET are respectively used to drive the two ends of a piezoelectric ceramic piece in the piezoelectric ceramic piece being connected setting in pairs on piezo jet valve;
The grid of the 2nd MOSFET connects the output of the second optical coupler 32, the source electrode of the 2nd MOSFET and grid ground connection after resistance respectively, drain electrode and the ground of the 2nd MOSFET of the 2nd MOSFET are respectively used to drive the two ends of another piezoelectric ceramic piece in the piezoelectric ceramic piece being connected setting in pairs on piezo jet valve.
In the utility model, a MOSFET and the 2nd MOSFET is adopted to form push-pull circuit, preferably, one MOSFET and the 2nd MOSFET is 10N60C, operationally, two MOSFET only have a conducting at every turn, make that conduction loss of the present utility model is little, operating efficiency is high.
As further improvement of the utility model, as shown in Fig. 5 a-5b, Drive and Control Circuit also comprises the first constant-current source discharge loop 51 and/or the second constant-current source discharge loop 52, first constant-current source discharge loop 51 comprises the first slide rheostat, the first operational amplifier and the 3rd MOSFET, second constant-current source discharge loop 52 comprises the second slide rheostat, the second operational amplifier and the 4th MOSFET, wherein:
The two ends of the first slide rheostat connect positive source and ground respectively, the sliding end of the first slide rheostat connects the in-phase input end of the first operational amplifier after resistance, the output of the first operational amplifier connects the grid of the 3rd MOSFET, the inverting input of the first operational amplifier connects the source electrode of the 3rd MOSFET after resistance, electric capacity is connected with between the in-phase input end of the first operational amplifier and output, source electrode ground connection after resistance of the 3rd MOSFET, drain electrode and the source electrode of the 3rd MOSFET are respectively used to be connected the two ends of a piezoelectric ceramic piece in the piezoelectric ceramic piece that piezo jet valve is arranged in pairs,
The two ends of the second slide rheostat connect positive source and ground respectively, the sliding end of the second slide rheostat connects the in-phase input end of the second operational amplifier after resistance, the output of the second operational amplifier connects the grid of the 4th MOSFET, the inverting input of the second operational amplifier connects the source electrode of the 4th MOSFET after resistance, electric capacity is connected with between the in-phase input end of the second operational amplifier and output, source electrode ground connection after resistance of the 4th MOSFET, drain electrode and the source electrode of the 4th MOSFET are respectively used to be connected the two ends of another piezoelectric ceramic piece in the piezoelectric ceramic piece that piezo jet valve is arranged in pairs.
The constant-current source discharge loop that the utility model adopts, main purpose helps the piezoelectric ceramic piece of capacitive load to release fast electric charge, makes the drive waveforms of piezoelectric ceramic piece have quick fall off rate, enable the utility model be operated in normal operating state.
Improve as another kind of the present utility model; as shown in Fig. 6 a-6b; Drive and Control Circuit also comprises the first output protection module 61 and/or the second output protection module 62; first output protection module 61 comprises the first optical coupling isolator and the first computing comparator; second output protection module 62 comprises the second optical coupling isolator and the second computing comparator, wherein:
Two inputs of the first optical coupling isolator connect the source electrode of a MOSFET and the drain electrode of the 2nd MOSFET respectively, the cathode output end of the first optical coupling isolator connects positive source, cathode output end connects the inverting input of the first computing comparator, the in-phase input end of the first computing comparator is connected with the first reference voltage, and the output of the first computing comparator connects the grid of a MOSFET;
Two inputs of the second optical coupling isolator connect the source electrode of the 2nd MOSFET and the ground of the 2nd MOSFET respectively, the cathode output end of the second optical coupling isolator connects positive source, cathode output end connects the inverting input of the second computing comparator, the in-phase input end of the second computing comparator is connected with the second reference voltage, and the output of the second computing comparator connects the grid of the 2nd MOSFET.
In the utility model, the first output protection module 61 and the second output protection module 62 is adopted to be for protecting Drive and Control Circuit.In case of high pressures, load short circuits for a certain reason, if do not add output protection module, easily causes the damage of power device, and then jeopardizes the safety of Drive and Control Circuit.The the first output protection module 61 adopted in the utility model is identical with the circuit structure of the second output protection module 62, all adopts optical coupling isolator and the combination of computing comparator to form.For the first output protection module 61, the positive pole of the light-emitting diode of the first optical coupling isolator inside and negative pole are connected in the source electrode of a MOSFET and the drain electrode of the 2nd MOSFET, when load short circuits for a certain reason, resistance between the source electrode of the one MOSFET and the drain electrode of the 2nd MOSFET will produce a larger pressure drop, now, first optical coupling isolator conducting, cathode output end is caused to export a magnitude of voltage, when magnitude of voltage is greater than the first reference voltage, the output output low level of the first computing comparator, then the grid of a MOSFET can be dragged down, make a MOSFET cut-off, thus the protective effect achieved a MOSFET, and then protect the safety of integrated circuit.Second output protection module 62 is identical with the effect of the first output protection module 61, can realize the protection to the 2nd MOSFET.
In the utility model, control module 1 is also connected with and controls button and liquid crystal display.
In the utility model, be saved in the ROM of control module 1 by controlling button adjustment output parameter, control module 1 can according to the data controlling key-press input, control the pulsewidth and the periodicity that export square-wave pulse, thus the output realizing Drive and Control Circuit is controlled, the liquid crystal display adopted in the utility model can show the information such as pulse width time, cycle time, output mode that control module 1 exports, and effectively achieves human-computer interaction.
As further improvement of the utility model, as shown in Figure 7, power module comprises D/A converter 71, integrated pulse width modulation chip 72, two recommends triode 73, DC-DC transformer 74, rectification circuit 75 and filter circuit 76, wherein:
The output of the input link control module of D/A converter 71, the output of D/A converter 71 connects the input of integrated pulse width modulation chip 72;
The output of integrated pulse width modulation chip 72 connects in two base stages of recommending triode 73 respectively;
Ground connection after two emitters of recommending triode 73 are connected;
DC-DC transformer 74 is three input two output transformers, two collector electrodes of recommending triode 73 connect the input at the two ends of DC-DC transformer 74 respectively, the intermediate input termination power positive pole ground connection after electric capacity simultaneously of DC-DC transformer 74, the output of DC-DC transformer 74 exports the direct voltage after boosting after rectification circuit 75 and filter circuit 76.
In the utility model, using integrated pulse width modulation chip 72 as high frequency power change-over circuit, preferred employing SG3524, two are driven to recommend triode 73, extraneous 24V direct current is converted to the pulse voltage being greater than 20KHz, eventually pass high frequency transformer boosting, then through over commutation and filtering, the pulse voltage being greater than 20KHz is converted to stable direct current and exports.And in prior art, normal employing 220V is alternating current (AC) directly-powered, rectification after transformer, filtering obtain direct voltage, adopt the direct voltage ripple obtained in this way comparatively large, under certain volume, power output is less, load capacity is weak, and the transformer adopted in prior art belongs to common linear transformer, bulky, excessively takes up room.Compared with prior art, the ripple of the output voltage of the power module that the utility model adopts is little, and under certain volume, power output is large, and meanwhile, the high frequency transformer volume adopted in the utility model is little.In addition, power module in the utility model is in order to meet the power demands of other modules, voltage conversion chip is also adopted to convert 24V direct voltage to 15V direct current, 5V direct current, 3.3V direct-current working volts, as the voltage transitions adopting AMS1117 chip to realize 24V to 3.3V, LM7815 chip is adopted to realize the voltage transitions etc. of 24V to 15V.
On the other hand, the utility model also provides a kind of piezo jet valve, comprises above-mentioned Drive and Control Circuit.
In piezo jet valve of the present utility model, include above-mentioned Drive and Control Circuit.Therefore, compared with prior art, the utility model has the advantages that speed is fast, precision is high.
In piezo jet valve of the present utility model, as shown in Figure 8, piezo jet valve also comprises fluid heating control module, and fluid heating control module comprises temperature collect module 81 and carries out the heater switch circuit 82 that heats for convection cell, wherein:
The output of temperature collect module 81 is connected with the input of control module 1;
The input of heater switch circuit 82 is connected with the output of control module 1, and the output of heater switch circuit 82 is for connecting DC heating rod.
In the utility model, temperature collect module 81 comprises thermocouple Pt100, and thermocouple output is through being used for the A/D module of the Pt100 temperature collection circuit link control module 1 of signal amplification; Heater switch circuit 82 comprises triode, optocoupler and MOSFET, wherein: the base stage of triode is connected with control module 1, the collector and emitter of triode connects positive source and ground respectively, the collector electrode of triode also connects the input of optocoupler, the output of optocoupler connects the grid of MOSFET, the source ground of MOSFET, the drain electrode of MOSFET is connected with positive source by 24V heating rod.
The fluid heating control module 1 adopted in the utility model is for carrying out computer heating control to the fluid passage in valve body, and the utility model is primarily of the thermocouple Pt100 for carrying out temperature acquisition and the 24V heating rod composition for carrying out heating temperatures.At work, control module 1 sets pre-heating temperature, valve body actual temperature inputs to control module 1 by Pt100 through the analog-to-digital conversion passage of operational amplifier input control device, control module 1 calculates the actual temperature value of valve body by internal processes, and compare with pre-heating temperature value, when actual temperature is less than pre-heating temperature, control module 1 output drive signal makes 24V DC heating rod start working by heater switch circuit 82, when actual temperature is more than or equal to pre-heating temperature, heating rod quits work.
The utility model also has following beneficial effect:
1. the utility model can realize piezo jet valve and normally works under 1Hz – 1KH point glue frequency, significantly improves some glue speed, is enough to the application of applicable industry spot;
2. the utility model mainly with a glue three-dimensional platform with the use of, meanwhile, a glue job can also be carried out separately;
3. working method of the present utility model mainly contains and gets (Trigger), line (Lasting), cleaning (Purge) Three models ready.Mainly through regulating pulse width time, the cycle time of driving voltage waveform to change glue and drip size, also can change glue by the some glue number of times changing same position and dripping size;
4., in the utility model, when using high viscosity colloid, in temperature allowed range, colloid viscosity can be reduced by the heating of heating module convection cell passage, thus piezo jet valve normally worked.If do not need heating, heating module can be disassembled.
5., after power cut-off of the present utility model, power supply can make piezo jet valve maintain closed condition about 30 minutes, prevents colloid from leaking.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. a Drive and Control Circuit, comprise power module, control module, first and second power devices, the output of described first and second power devices is respectively used to drive the piezoelectric ceramic piece connecting and piezo jet valve is arranged in pairs, it is characterized in that, an output of described control module connects the input of described first and second power devices simultaneously, the first optical coupler is provided with between the output of described control module and the input of the first power device, the second optical coupler is provided with between the output of described control module and the input of the second power device, described first optical coupler and the second optical coupler are respectively at height, work under low level.
2. Drive and Control Circuit according to claim 1, is characterized in that, the positive pole of the interior light emitting diodes of described first optical coupler connects the output of described control module, the minus earth of the interior light emitting diodes of described first optical coupler;
The positive pole of the interior light emitting diodes of described second optical coupler connects positive source, and the negative pole of the interior light emitting diodes of described second optical coupler connects the output of described control module.
3. Drive and Control Circuit according to claim 2, is characterized in that, is provided with the first voltage stabilizing didoe between the positive pole of the interior light emitting diodes of described first optical coupler and the output of described control module;
The second voltage stabilizing didoe is provided with between the negative pole of the interior light emitting diodes of described second optical coupler and the output of described control module.
4. Drive and Control Circuit according to claim 3, is characterized in that, described first power device and the second power device are respectively a MOSFET and the 2nd MOSFET, wherein:
The grid of a described MOSFET connects the output of described first optical coupler, the drain electrode of a described MOSFET connects positive source, source electrode and the grid of a described MOSFET are connected the drain electrode of described 2nd MOSFET respectively after resistance, and drain electrode and the drain electrode of described 2nd MOSFET of a described MOSFET are respectively used to drive the two ends of a piezoelectric ceramic piece in the piezoelectric ceramic piece being connected setting in pairs on piezo jet valve;
The grid of described 2nd MOSFET connects the output of described second optical coupler, the source electrode of described 2nd MOSFET and grid ground connection after resistance respectively, drain electrode and the ground of described 2nd MOSFET of described 2nd MOSFET are respectively used to drive the two ends of another piezoelectric ceramic piece in the piezoelectric ceramic piece being connected setting in pairs on piezo jet valve.
5. Drive and Control Circuit according to claim 4, it is characterized in that, described Drive and Control Circuit also comprises the first constant-current source discharge loop and/or the second constant-current source discharge loop, described first constant-current source discharge loop comprises the first slide rheostat, the first operational amplifier and the 3rd MOSFET, described second constant-current source discharge loop comprises the second slide rheostat, the second operational amplifier and the 4th MOSFET, wherein:
The two ends of described first slide rheostat connect positive source and ground respectively, the sliding end of described first slide rheostat connects the in-phase input end of described first operational amplifier after resistance, the output of described first operational amplifier connects the grid of described 3rd MOSFET, the inverting input of described first operational amplifier connects the source electrode of described 3rd MOSFET after resistance, electric capacity is connected with between the in-phase input end of described first operational amplifier and output, source electrode ground connection after resistance of described 3rd MOSFET, drain electrode and the source electrode of described 3rd MOSFET are respectively used to be connected the two ends of a piezoelectric ceramic piece in the piezoelectric ceramic piece that piezo jet valve is arranged in pairs,
The two ends of described second slide rheostat connect positive source and ground respectively, the sliding end of described second slide rheostat connects the in-phase input end of described second operational amplifier after resistance, the output of described second operational amplifier connects the grid of described 4th MOSFET, the inverting input of described second operational amplifier connects the source electrode of described 4th MOSFET after resistance, electric capacity is connected with between the in-phase input end of described second operational amplifier and output, source electrode ground connection after resistance of described 4th MOSFET, drain electrode and the source electrode of described 4th MOSFET are respectively used to be connected the two ends of another piezoelectric ceramic piece in the piezoelectric ceramic piece that piezo jet valve is arranged in pairs.
6. Drive and Control Circuit according to claim 4; it is characterized in that; described Drive and Control Circuit also comprises the first output protection module and/or the second output protection module; described first output protection module comprises the first optical coupling isolator and the first computing comparator; described second output protection module comprises the second optical coupling isolator and the second computing comparator, wherein:
Two inputs of described first optical coupling isolator connect the source electrode of a described MOSFET and the drain electrode of described 2nd MOSFET respectively, the cathode output end of described first optical coupling isolator connects positive source, cathode output end connects the inverting input of described first computing comparator, the in-phase input end of described first computing comparator is connected with the first reference voltage, and the output of described first computing comparator connects the grid of a described MOSFET;
Two inputs of described second optical coupling isolator connect the source electrode of described 2nd MOSFET and the ground of described 2nd MOSFET respectively, the cathode output end of described second optical coupling isolator connects positive source, cathode output end connects the inverting input of described second computing comparator, the in-phase input end of described second computing comparator is connected with the second reference voltage, and the output of described second computing comparator connects the grid of described 2nd MOSFET.
7. Drive and Control Circuit according to claim 3, is characterized in that, described control module is also connected with and controls button and liquid crystal display.
8., according to described Drive and Control Circuit arbitrary in claim 1-7, it is characterized in that, described power module comprise D/A converter, integrated pulse width modulation chip, two recommend triode, DC-DC transformer, rectification circuit and filter circuit, wherein:
The input of described D/A converter connects the output of described control module, and the output of described D/A converter connects the input of described integrated pulse width modulation chip;
The output of described integrated pulse width modulation chip connects described two respectively and recommends in the base stage of triode;
Ground connection after described two emitters of recommending triode are connected;
Described DC-DC transformer is three input two output transformers, described two collector electrodes of recommending triode connect the input at the two ends of described DC-DC transformer respectively, the intermediate input termination power positive pole ground connection after electric capacity simultaneously of described DC-DC transformer, the output of described DC-DC transformer exports the direct voltage after boosting after described rectification circuit and filter circuit.
9. a piezo jet valve, is characterized in that, comprises arbitrary described Drive and Control Circuit in claim 1-8.
10. piezo jet valve according to claim 9, is characterized in that, described piezo jet valve also comprises fluid heating control module, and described fluid heating control module comprises temperature collect module and carries out the heater switch circuit that heats for convection cell, wherein:
The output of described temperature collect module is connected with the input of described control module;
The input of described heater switch circuit is connected with the output of described control module, and the output of described heater switch circuit is for connecting DC heating rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520849200.4U CN205160405U (en) | 2015-10-28 | 2015-10-28 | Drive and control circuit and have piezoelectricity injection valve of this circuit |
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| CN201520849200.4U CN205160405U (en) | 2015-10-28 | 2015-10-28 | Drive and control circuit and have piezoelectricity injection valve of this circuit |
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| CN205160405U true CN205160405U (en) | 2016-04-13 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106292448A (en) * | 2016-09-06 | 2017-01-04 | 吉林大学 | Piezo jet spot gluing equipment drive dynamic control device |
| CN107390736A (en) * | 2017-08-25 | 2017-11-24 | 河北鹏冠科技股份有限公司 | A kind of temperature control system and its application method of piezoelectric ceramics injection valve stability and high efficiency |
| CN107621837A (en) * | 2017-04-26 | 2018-01-23 | 中南大学 | A kind of Variable power temperature control system and control method for fluid injection valve |
| CN107966332A (en) * | 2017-11-21 | 2018-04-27 | 宇星科技发展(深圳)有限公司 | Particulate matter detection means and its circuit |
| CN110380639A (en) * | 2019-08-06 | 2019-10-25 | 清华大学合肥公共安全研究院 | A kind of piezoelectric ceramic power drive device and its driving method |
| CN110798085A (en) * | 2019-11-14 | 2020-02-14 | 青岛航天半导体研究所有限公司 | Improved input voltage circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292448A (en) * | 2016-09-06 | 2017-01-04 | 吉林大学 | Piezo jet spot gluing equipment drive dynamic control device |
| CN106292448B (en) * | 2016-09-06 | 2018-10-19 | 吉林大学 | The drive dynamic control device of piezo jet spot gluing equipment |
| CN107621837A (en) * | 2017-04-26 | 2018-01-23 | 中南大学 | A kind of Variable power temperature control system and control method for fluid injection valve |
| CN107390736A (en) * | 2017-08-25 | 2017-11-24 | 河北鹏冠科技股份有限公司 | A kind of temperature control system and its application method of piezoelectric ceramics injection valve stability and high efficiency |
| CN107390736B (en) * | 2017-08-25 | 2022-12-02 | 河北鹏冠科技股份有限公司 | Stable and efficient temperature control system for piezoelectric ceramic injection valve and application method thereof |
| CN107966332A (en) * | 2017-11-21 | 2018-04-27 | 宇星科技发展(深圳)有限公司 | Particulate matter detection means and its circuit |
| CN110380639A (en) * | 2019-08-06 | 2019-10-25 | 清华大学合肥公共安全研究院 | A kind of piezoelectric ceramic power drive device and its driving method |
| CN110798085A (en) * | 2019-11-14 | 2020-02-14 | 青岛航天半导体研究所有限公司 | Improved input voltage circuit |
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