CN113285597A - Dual-piezoelectric injection valve controller circuit - Google Patents
Dual-piezoelectric injection valve controller circuit Download PDFInfo
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- CN113285597A CN113285597A CN202110479286.6A CN202110479286A CN113285597A CN 113285597 A CN113285597 A CN 113285597A CN 202110479286 A CN202110479286 A CN 202110479286A CN 113285597 A CN113285597 A CN 113285597A
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- 238000010438 heat treatment Methods 0.000 claims description 40
- 238000005070 sampling Methods 0.000 claims description 36
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
- B05C11/1026—Valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a dual-piezoelectric injection valve controller circuit, which comprises a power supply circuit, a piezoelectric injection valve driving circuit and a central processing unit circuit, wherein the power supply circuit is electrically connected with the central processing unit circuit and is used for supplying electric energy to each circuit; the piezoelectric injection valve driving circuit is electrically connected to the central processing unit circuit, the central processing unit circuit comprises a master control MCU, the piezoelectric injection valve driving circuit comprises a half-bridge driver U18, an MOS tube Q21, an MOS tube Q22 and an LC circuit, and the output end of the LC circuit is a trapezoidal wave output end PZT +; the master control CPU outputs complementary PWM to a half-bridge driver U18 to drive switches of an MOS tube Q21 and an MOS tube Q22, forms a trapezoidal wave for driving the piezoelectric injection valve after passing through an LC circuit, and realizes output from a trapezoidal wave output end PZT +; the invention has the beneficial effects that: realizing trapezoidal waves of piezoelectric control piezoelectric ceramics by using a PWM (pulse width modulation) synthesis mode; meanwhile, one controller can independently control the two piezoelectric ceramic injection valves.
Description
Technical Field
The invention relates to the technical field of dispensing controllers, in particular to a circuit of a double-piezoelectric injection valve controller.
Background
In a precise high-speed dispensing system based on a piezoelectric ceramic injection valve, a piezoelectric ceramic injection valve controller is of great importance. The piezoelectric ceramic injection valve is a new industry which is started in the latest dispensing system, can realize quick and precise dispensing operation based on the piezoelectric ceramic designed injection valve, and is used in wider application environment and space than the traditional electromagnetic valve or pneumatic valve.
The current piezoelectric ceramic driver scheme usually adopts a linear amplifying circuit consisting of a linear high-voltage operational amplifier and a post-stage power amplifying circuit, and the high-voltage operational amplifier has high cost and slow high-speed dynamic response. And the other controller can only independently control one piezoelectric injection valve, so that the production and maintenance cost is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a dual-piezoelectric injection valve controller circuit which has the advantages of high corresponding speed and lower price compared with the traditional high-voltage operational square amplifier.
The technical scheme adopted by the invention for solving the technical problems is as follows: the improvement of the circuit of the double-piezoelectric injection valve controller is that the circuit comprises a power supply circuit, a piezoelectric injection valve driving circuit and a central processing unit circuit, wherein the power supply circuit is electrically connected with the central processing unit circuit and is used for supplying electric energy to each circuit;
the piezoelectric injection valve driving circuit is electrically connected to a central processor circuit, the central processor circuit comprises a main control MCU, the piezoelectric injection valve driving circuit comprises a half-bridge driver U18, an MOS tube Q21, an MOS tube Q22 and an LC circuit, the grids of the MOS tube Q21 and the MOS tube Q22 are connected to a driving pin of a half-bridge driver U18, the drain electrode of the MOS tube Q21 is connected to a power supply end DC2, the source electrode of the MOS tube Q21 is connected with the drain electrode of the MOS tube Q22 to form a common end, the input end of the LC circuit is connected with the common end, and the output end of the LC circuit is a trapezoidal wave output end PZT +;
the main control CPU outputs complementary PWM to a half-bridge driver U18 to drive switches of an MOS tube Q21 and an MOS tube Q22, and forms trapezoidal waves for driving the piezoelectric injection valve after passing through an LC circuit, and the output is realized from a trapezoidal wave output end PZT +.
In the circuit structure, the central processing unit circuit is connected with a communication circuit, and the communication circuit comprises a 2-channel isolated RS232 communication module for realizing communication between the piezoelectric injection valve controller and the dispensing automation platform.
In the circuit structure, the power supply end DC2 is stabilized by the voltage stabilizing circuit to provide a stabilized voltage power supply PZT-, the piezoelectric ceramic anode of the piezoelectric injection valve is a trapezoidal wave output end PZT + to provide trapezoidal waves, and the piezoelectric ceramic cathode is the stabilized voltage power supply PZT-to increase the output force of the piezoelectric ceramic.
In the above circuit structure, the voltage stabilizing circuit includes a resistor R255, a capacitor C185, a zener diode Z6, and a capacitor C186;
the power supply end DC2 is connected with one end of a resistor R255, the other end of the resistor R255 is connected with the negative end of a voltage stabilizing diode Z6, and two ends of a capacitor C185 are connected with the positive end and the negative end of the voltage stabilizing diode Z6;
the negative end of the voltage stabilizing diode Z6 is the output end of a stabilized voltage power supply PZT-, a capacitor C180 is arranged between the stabilized voltage power supply PZT + and the trapezoidal wave output end PZT +, the positive end of the voltage stabilizing diode Z6 is a current sampling end PZT-B-I, a capacitor C186 is arranged between the output end of the stabilized voltage power supply PZT-and the current sampling end PZT-B-I, and a resistor R268 is arranged between the current sampling end PZT-B-I and the grounding end.
In the above circuit structure, the gate of the MOS transistor Q21 is connected to the driving pin HO of the half-bridge driver U18, and the gate of the MOS transistor Q22 is connected to the driving pin LO of the half-bridge driver U18; and the common terminal is connected to a VS pin of a half-bridge driver U18;
a resistor R264 is arranged between the source of the MOS transistor Q22 and the ground, and the source of the MOS transistor Q22 is the current sampling terminal SHORT _ B.
In the above circuit structure, an ADC sampling circuit is further disposed between the piezoelectric injection valve driving circuit and the main control MCU, and the ADC sampling circuit is connected to the current sampling terminal SHORT _ B.
In the above circuit structure, the central processing unit circuit is electrically connected with an optical coupler input/output circuit, and the optical coupler input/output circuit includes a 4-channel optical coupler input circuit and a 4-channel optical coupler output circuit.
In the above circuit structure, the central processing unit circuit is electrically connected with an MOS heating control circuit, which includes a push-pull circuit, an MOS transistor Q26 and a heating rod;
a resistor R65 is arranged between the output end of the push-pull circuit and the grid electrode of the MOS tube Q26, the heating rod is arranged between the drain electrode of the MOS tube Q26 and a power supply VCC, and a resistor R69 is arranged between the source electrode of the MOS tube Q26 and the grounding end.
In the above circuit structure, the push-pull circuit includes a transistor Q27, a transistor Q25, and a transistor Q28;
the control end of the master control MCU is connected with the base electrode of a triode Q27, the collector electrode of a triode Q27 is electrically connected with the base electrode of a triode Q25 and the base electrode of a triode Q28 respectively, a resistor R64 is arranged between the collector electrode of the triode Q27 and the collector electrode of a triode Q25, and the collector electrode of the triode Q25 is connected to a power supply port;
an emitter of the triode Q27 is grounded with a collector of the triode Q28, and a resistor R71 is arranged between the collector and the emitter of the triode Q27;
an emitter of the triode Q25 is connected with an emitter of the triode Q28 to form an output port, and the output port is the output end of the push-pull circuit;
the triode Q27 and the triode Q25 are NPN type triodes, and the triode Q28 is a PNP type triode.
In the circuit structure, the central processing unit circuit is electrically connected with a memory circuit, a temperature acquisition circuit, an LED control circuit, a display screen control circuit and a piezoelectric injection valve ID information control circuit;
the memory circuit comprises an EEPROM memory connected to the main control CPU;
the temperature acquisition circuit comprises an ADC temperature acquisition module, and the master control MCU is connected with the ADC temperature acquisition module in an SPI mode;
the piezoelectric injection valve ID information control circuit comprises a single bus memory, and the main control MCU reads the ID value and stores the dispensing frequency record in real time through the communication with the single bus memory.
The invention has the beneficial effects that: the trapezoidal wave of the piezoelectric control piezoelectric ceramic is realized by using a PWM (pulse width modulation) synthesis mode; meanwhile, one controller can independently control the two piezoelectric ceramic injection valves.
Drawings
Fig. 1 is a schematic circuit diagram of a dual piezo jet valve controller circuit of the present invention.
Fig. 2 is a diagram of a communication circuit according to an embodiment of the present invention.
Fig. 3 and 4 are diagrams of embodiments of the optocoupler input-output circuit of the invention.
FIG. 5 is a diagram of a memory circuit according to an embodiment of the present invention.
Fig. 6 and 7 are diagrams showing an embodiment of a piezoelectric injection valve driving circuit according to the present invention.
Fig. 8 is a diagram of an embodiment of an ACD sampling circuit according to the present invention.
FIG. 9 is a diagram of an embodiment of a MOS heating control circuit according to the invention.
Fig. 10 and 11 are diagrams of embodiments of the temperature acquisition circuit of the present invention.
FIG. 12 is a diagram of an embodiment of a piezoelectric injection valve ID information control circuit of the present invention.
FIG. 13 is a diagram of a display control circuit according to an embodiment of the present invention.
Figure 14 is a diagram of an embodiment of an LED control circuit of the present invention,
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Referring to fig. 1, the present invention discloses a dual piezo-electric injection valve controller circuit, specifically, the circuit includes a power supply circuit 10, a piezo-electric injection valve driving circuit 20 and a central processing unit circuit 30, the power supply circuit 10 is electrically connected to the central processing unit circuit 30, and the power supply circuit 10 is used for providing electric energy to each circuit; in addition, the device also comprises a communication circuit 401, a display screen control circuit 402, an LED control circuit 403, a piezoelectric injection valve ID information control circuit 404, a temperature acquisition circuit 405, an MOS heating control circuit 406, an ADC sampling circuit 407, a piezoelectric injection valve driving circuit 408, a memory circuit 409 and an optical coupling input/output circuit 410 which are electrically connected with the central processing unit circuit 30; the specific structure and function of such a circuit will be described further below.
The dual-piezoelectric injection valve controller circuit is a typical SoC embedded control system, and an independent circuit control system is formed by connecting various sensors and input and output equipment with a 32-bit high-performance embedded microcontroller bit core.
As shown in fig. 1, fig. 6 and fig. 7, the piezoelectric injection valve driving circuit 40820 is electrically connected to the central processing unit circuit 30, the central processing unit circuit 30 includes a main control MCU, the main control MCU is a core component of the whole controller, a 32-bit CORTEX-M4 architecture high-performance embedded microcontroller is adopted, resources on a chip are abundant, a multi-channel high-speed ADC function unit, a high-level DMA timer PWM output unit, a UART, an SPI interface, an ethernet module interface, a TFT controller and other modules are integrated, a man-machine interaction operation function can be realized, a PWM high-speed modulation signal is output, a heater thermostatic control and overload protection function, a nozzle position calibration function, an external glue spraying trigger input function and other functions are integrated. As shown in fig. 7, the piezoelectric injection valve driving circuit 40820 includes a half-bridge driver U18, a MOS transistor Q21, a MOS transistor Q22, and an LC circuit, where gates of the MOS transistor Q21 and the MOS transistor Q22 are connected to a driving pin of the half-bridge driver U18, a drain of the MOS transistor Q21 is connected to a power supply terminal DC2, a source of the MOS transistor Q21 is connected to a drain of the MOS transistor Q22 to form a common terminal, an input terminal of the LC circuit is connected to the common terminal, and an output terminal of the LC circuit is a trapezoidal wave output terminal PZT +; the main control CPU outputs complementary PWM to a half-bridge driver U18 to drive switches of an MOS tube Q21 and an MOS tube Q22, and forms trapezoidal waves for driving the piezoelectric injection valve after passing through an LC circuit, and the output is realized from a trapezoidal wave output end PZT +.
Further, as shown in fig. 6 and 7, after the power supply terminal DC2 is stabilized by the voltage stabilizing circuit, a stabilized voltage power PZT "is provided, the positive electrode of the piezoelectric ceramic of the piezoelectric injection valve is the trapezoidal wave output terminal PZT +, a trapezoidal wave is provided, and the negative electrode of the piezoelectric ceramic is the stabilized voltage power PZT" to increase the output power of the piezoelectric ceramic. In FIG. 7, the voltage regulator circuit includes a resistor R255, a capacitor C185, a Zener diode Z6, and a capacitor C186; the power supply end DC2 is connected with one end of a resistor R255, the other end of the resistor R255 is connected with the negative end of a voltage stabilizing diode Z6, and two ends of a capacitor C185 are connected with the positive end and the negative end of the voltage stabilizing diode Z6; the negative end of the voltage stabilizing diode Z6 is the output end of a stabilized voltage power supply PZT-, a capacitor C180 is arranged between the stabilized voltage power supply PZT + and the trapezoidal wave output end PZT +, the positive end of the voltage stabilizing diode Z6 is a current sampling end PZT-B-I, a capacitor C186 is arranged between the output end of the stabilized voltage power supply PZT-and the current sampling end PZT-B-I, and a resistor R268 is arranged between the current sampling end PZT-B-I and the grounding end.
In fig. 7, the gate of the MOS transistor Q21 is connected to the driving pin HO of the half-bridge driver U18, and the gate of the MOS transistor Q22 is connected to the driving pin LO of the half-bridge driver U18; and the common terminal is connected to a VS pin of a half-bridge driver U18; a resistor R264 is arranged between the source of the MOS transistor Q22 and the ground, and the source of the MOS transistor Q22 is the current sampling terminal SHORT _ B.
Fig. 5 is a switching schematic diagram of a driving module power supply of the piezoelectric injection valve driving circuit 40820, which includes a power supply terminal DC1, a power supply terminal DC2, a MOS transistor Q6, and a transistor Q7, and the connection relationship is as shown in the figure, a full-bridge BUCK circuit is adopted, and a power supply DC1 used by the full-bridge BUCK circuit is connected to the BUCK circuit after passing through a PMOS switch. When the back-end circuit is abnormal, the power supply can be quickly turned off for protection, and more serious damage is prevented. Especially, when the BUCK circuit has abnormal short circuit, the BUCK circuit can be effectively protected.
Fig. 6 is a schematic diagram of a piezoelectric sandblasting driving circuit, in the scheme, a half-bridge BUCK circuit is adopted, and a main control MCU outputs complementary PWM to a half-bridge driver U18, so as to drive two MOS transistor switches, and after passing through an LC circuit, a trapezoidal wave PZT + driving a piezoelectric injection valve is formed. The power supply DCD2 provides a regulated power PZT-. The positive electrode of the piezoelectric ceramic of the piezoelectric injection valve provides adjustable trapezoidal waves, and the negative electrode of the piezoelectric ceramic provides a stable DC power supply, so that the output force of the piezoelectric ceramic can be increased. After the negative voltage is increased, under the same parameter without the negative voltage, the output glue amount is more, and the dispensing effect is more excellent. SHORT _ B and PZT-B-I are current sampling signals, and the ADC acquires data in real time after the main control MCU passes through the operational amplifier; and when the alarm threshold is reached, performing related protection processing. Meanwhile, the voltage values of PTZ + and PTZ-are sampled and monitored in real time, and the output is ensured to be within a theoretical value range. And when abnormal values occur at the same time, alarming. In this embodiment, two independent piezoelectric injection valve driving circuits 40820 are integrated, and independent work is not dry, and even if one circuit fails to work, the other circuit does not affect work.
As for the ADC sampling circuit 407, as shown in fig. 8, the present invention provides a specific embodiment, the ADC sampling circuit 407 is disposed between the piezo injector driving circuit 40820 and the main control MCU, the ADC sampling circuit 407 is connected to the current sampling terminal SHORT _ B; the main control MCU collects and processes related parameters through an ADC (analog to digital converter) collecting circuit, and mainly comprises two piezoelectric ceramic positive voltage, negative voltage, normal working current, nozzle calibration current, BUCK circuit MOS (metal oxide semiconductor) current, a nozzle heating block and a rubber barrel heating current sample of a driving module of the piezoelectric injection valve. And monitoring whether the current time is within a reasonable range in real time, and performing exception handling when an exception occurs. Referring to fig. 8, after passing through a resistor divider R77 and a voltage regulator D9, the signal is filtered by an RC filter and transmitted to an operational amplifier U5D; after corresponding amplification processing, the signals are input into a master control MCU through an RC low-pass filter; and comparing the sampling value with a set threshold value, and performing corresponding processing.
As for the communication circuit 401, as shown in fig. 2, the present invention provides a specific embodiment, in this embodiment, the communication circuit 401 includes a 2-channel isolated RS232 communication module, which is used for implementing communication between the piezoelectric injection valve controller and the dispensing automation platform, and includes a communication chip U12. The dispensing automation platform sets the relevant parameters of the controller through the RS232 communication module, or performs necessary information query; meanwhile, software upgrading can be carried out on the controller through the RS232 communication module; the electrical complexity of the dispensing automation control platform is relatively high, so that an electrically isolated RS232 communication module is used.
Referring to fig. 3 and 4, for the optical coupler input/output circuit 410, the present invention also provides a specific embodiment, where the optical coupler input/output circuit 410 includes a 4-channel optical coupler input circuit and a 4-channel optical coupler output circuit, fig. 3 is a schematic diagram of the 4-channel optical coupler input circuit, and receives an automatic dispensing system hardware trigger dispensing and a trigger hidden mode parameter through the 4-channel optical coupler input circuit, where 2 is used for controlling a first piezoelectric injection valve, and the other two are used for controlling a second piezoelectric injection valve. The controller is used in a high-speed dispensing system and needs to respond to the dispensing requirement quickly, otherwise, the dispensing position lags behind, thereby influencing the dispensing process. Fig. 4 is a schematic diagram of a 4-channel optical coupling output circuit, wherein 2 channels are applied to two piezoelectric injection valve controllers to generate alarm signals to an automation platform when alarms occur, and the platform performs alarm processing simultaneously. The other two paths are applied to two piezoelectric ceramic temperature control loops, and the temperature of the piezoelectric ceramic is controlled through a PID algorithm.
Referring to fig. 5, for the memory circuit 409, according to a specific embodiment of the present invention, the memory circuit 409 includes a memory chip U13, and the memory circuit controls an internal sampling EEPROM to store important parameters of a controller, and mainly stores important parameter storage backups such as dispensing parameter storage and dispensing frequency storage of the controller. After the power is cut off, the storage controller can also store important parameters of the controller, particularly dispensing parameters, so that the storage controller is convenient for customers to use; instead of powering up the control each time, the parameters need to be reset.
Referring to fig. 9, for the MOS heating control circuit 406, according to an embodiment of the present invention, the MOS heating control circuit 406 is electrically connected to the central processing unit circuit 30, and the MOS heating control circuit 406 includes a push-pull circuit, a MOS transistor Q26 and a heating rod; a resistor R65 is arranged between the output end of the push-pull circuit and the grid electrode of the MOS tube Q26, the heating rod is arranged between the drain electrode of the MOS tube Q26 and a power supply VCC, and a resistor R69 is arranged between the source electrode of the MOS tube Q26 and the grounding end.
In this embodiment, the push-pull circuit includes a transistor Q27, a transistor Q25, and a transistor Q28; the control end of the master control MCU is connected with the base electrode of a triode Q27, the collector electrode of a triode Q27 is electrically connected with the base electrode of a triode Q25 and the base electrode of a triode Q28 respectively, a resistor R64 is arranged between the collector electrode of the triode Q27 and the collector electrode of a triode Q25, and the collector electrode of the triode Q25 is connected to a power supply port; an emitter of the triode Q27 is grounded with a collector of the triode Q28, and a resistor R71 is arranged between the collector and the emitter of the triode Q27; an emitter of the triode Q25 is connected with an emitter of the triode Q28 to form an output port, and the output port is the output end of the push-pull circuit; the triode Q27 and the triode Q25 are NPN type triodes, and the triode Q28 is a PNP type triode.
Each piezoelectric injection valve is provided with a nozzle heating block and a glue barrel heating control, and is used when glue needs to be heated. The main control MCU controls the conduction and the disconnection of the MOS tube Q26 through a push-pull circuit formed by the control triodes, thereby controlling the VCC power supply to heat the heating rod. The feedback of the actual temperature value is tested through the PT1000 and the temperature detection module, and the main control MCU controls heating through a PID algorithm, so that the heated temperature is ensured to be within the range of the required value. The MOS is used for controlling heating, the switching speed is high, the requirement on service life is avoided, and the control requirement is easy to realize.
As shown in fig. 10 and 11, for the temperature acquisition circuit 405, a specific embodiment is provided in the present invention, the temperature acquisition circuit 405 includes an ADC temperature acquisition module, and the main control MCU is connected to the ADC temperature acquisition module in an SPI manner. In this embodiment, there are 2 ways of nozzle heating block temperatures, 2 ways of glue barrel heating barrel temperatures and 2 ways of piezoelectric injection valve ceramic temperatures, and there are 6 ways of temperatures to be detected. The main control MCU controls the ADC temperature acquisition module of 24bie in an SPI mode, and the temperature of the detected object is calculated by sampling the numerical value of PT 1000. After the temperatures of the heating block and the heating barrel are obtained, the heating block and the heating barrel are subjected to heating control in a mode of controlling an MOS switch through a PID algorithm and an actual set temperature. The temperature of the piezoelectric ceramic is detected in real time, and when the temperature exceeds a set threshold value, alarm processing is carried out, so that the piezoelectric ceramic is prevented from being damaged due to overhigh temperature.
Referring to FIG. 12, a specific embodiment of the present invention is provided for the piezo injector ID information control circuit 404 as described above. The piezoelectric ceramics of each piezoelectric injection valve have service life, and after the service life is exceeded, the performance is deteriorated, and the precise dispensing effect is possibly influenced. The piezoelectric injection valve can record the service life of the piezoelectric injection valve by using the dispensing times, and when the dispensing times exceed a certain point number, the piezoelectric ceramic needs to be replaced. In addition, each piezoelectric valve has a unique ID value, so that the piezoelectric valve is convenient to identify. According to the requirements, a single-bus memory is arranged in each piezoelectric injection valve, and the main control MCU is communicated with the single-bus memory through a single-bus circuit to read the ID value of the single-bus memory and store the dispensing frequency records in real time.
In addition, the present invention also provides specific embodiments for specific structures of the display screen control circuit 402 and the LED control circuit 403. Referring to fig. 13, which is a specific embodiment of the display screen control circuit 402, in the present embodiment, a serial resistor is used to touch the display screen, which can trigger the controller to dispense, set the relevant dispensing parameters, set the temperatures of the heating block and the heating barrel, and start heating; displaying the dispensing times, displaying the ID information of the piezoelectric injection valve and the dispensing times, and the like. And performing man-machine interaction operation through the touch screen. A display screen with dimensions of 5.6 inches, 800 x 400 pixels, and 65K colors was selected. Due to the adoption of serial port communication with better interference capability, the display screen is not easy to be interfered to cause abnormal work.
Referring to fig. 14, it is a specific embodiment of the LED control circuit 403, and the LED display is adopted, so as to mainly facilitate human-computer interaction, and determine the relevant conditions of the controller according to the on/off or flashing state of the LED. One path of controller dispensing starts the LED, and when the LED is turned on from the off state, dispensing is carried out, and the LED is lighted once every time when one LED is lighted. The heating block or the heating barrel in the same path is used for heating indication, and the indicating lamp is on when heating is carried out. And when the controller gives an alarm, the indicator lamp continuously flickers. The transistor Q1 controls the LED2 to conduct, so as to provide sufficient current and protect the pin of the main controller from being damaged due to interference caused by the length of the wire.
The piezoelectric injection valve is a piezoelectric ceramic valve and is an action execution mechanism for injecting glue, a piezoelectric ceramic stack is arranged in the piezoelectric ceramic valve, the piezoelectric ceramic valve cyclically reciprocates and extends and retracts under the condition of cyclic charge and discharge of driving voltage to drive a valve body mechanism to open and close the valve, a single-wire EEPROM chip is arranged in the valve body and connected to a main control MCU (microprogrammed control unit) and used for recording the quantity of glue injection points accumulated by the valve, and contents such as product serial numbers, factory information and the like can be written in the valve body, so that the piezoelectric injection valve is convenient for after-sale maintenance and tracking.
In addition, the power supply circuit 10 includes two power supplies, an AC220-DC12V low-voltage power supply is used for supplying power to low-voltage small-signal modules such as a main control MCU, and another 140V single power supply is used for supplying power to the piezoelectric ceramic driving module.
Compared with the prior art, the circuit structure has the following advantages that:
(1) the part of the double-valve controller connected with the automatic dispensing system platform, the trigger dispensing, the alarm signal and the RS232 communication adopt an electrical isolation mode; the phenomenon that the work is abnormal due to the fact that the complex electrical interference of the dispensing system is caused to the controller is avoided; the former proposal adopts a direct electrical connection mode, and the controller is interfered and works abnormally.
(2) The piezoelectric injection valve is driven by a half-bridge BUCK circuit mode, and compared with a traditional high-voltage operational amplifier, the piezoelectric injection valve has the advantages of high corresponding speed and lower price; meanwhile, the invention is designed into a double-valve driving controller, one controller can independently drive two piezoelectric injection valves, and two single-piezoelectric injection valve controllers can be replaced; the actual BOM cost and the production and maintenance cost are greatly saved; compared with two single-valve controllers, the volume is reduced greatly, and great convenience is brought to the design space of the dispensing system.
(3) Related voltage and current sampling all uses an automatic ADC module of a master control MCU, and all adopt the mode of isolation of an operational amplifier; the ADC sampling pin of the master control MCU is prevented from being damaged when the sampling signal is abnormal under high voltage; compared with the earlier designed sampling, the sampling is directly connected to the ADC sampling pin of the main control MCU after being subjected to resistance voltage division, so that the ADC sampling pin of the MCU is effectively protected from being damaged.
(4) The heating block designed in the earlier stage adopts a DC 140V power supply and adopts a relay mode. The heating voltage may injure the user, and the relay has a life limit and may vibrate when switching. The design adopts a mode of controlling the switch of an MOS tube to control the heating of the power supply to the heating block, and uses a DC 24V power supply which is safe to human bodies; the safety of users is ensured while the reliability and stability of the functions are ensured.
(5) The ADC that adopts special PT1000 collection realizes the sampling to the temperature, compares with traditional thermocouple scheme, and the temperature value of gathering is more reliable and stable, can accomplish the precision of 0.1 ℃ at minimum, and the heating is stable can keep at 1 ℃ of error. Meanwhile, a multi-channel acquisition module and an IC (integrated circuit) are adopted, so that the temperature of 8 channels can be acquired in real time; the master control MCU and the sampling IC adopt SPI communication, and data transmission is rapid and stable.
(6) A resistance touch screen with serial communication replaces the earlier designed scheme of keys and a black and white display screen LCD; the human-computer interaction experience is improved, and the operation controller is simpler and more friendly; meanwhile, the use of the master control MCU is reduced, and the MCU port with resource shortage is saved; serial port communication is more stable, has solved earlier because the mainboard has the unusual problem that leads to the display screen to report white screen and messy code often to appear.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A dual-piezoelectric injection valve controller circuit is characterized by comprising a power supply circuit, a piezoelectric injection valve driving circuit and a central processing unit circuit, wherein the power supply circuit is electrically connected with the central processing unit circuit and is used for supplying electric energy to each circuit;
the piezoelectric injection valve driving circuit is electrically connected to a central processor circuit, the central processor circuit comprises a main control MCU, the piezoelectric injection valve driving circuit comprises a half-bridge driver U18, an MOS tube Q21, an MOS tube Q22 and an LC circuit, the grids of the MOS tube Q21 and the MOS tube Q22 are connected to a driving pin of a half-bridge driver U18, the drain electrode of the MOS tube Q21 is connected to a power supply end DC2, the source electrode of the MOS tube Q21 is connected with the drain electrode of the MOS tube Q22 to form a common end, the input end of the LC circuit is connected with the common end, and the output end of the LC circuit is a trapezoidal wave output end PZT +;
the main control CPU outputs complementary PWM to a half-bridge driver U18 to drive switches of an MOS tube Q21 and an MOS tube Q22, and forms trapezoidal waves for driving the piezoelectric injection valve after passing through an LC circuit, and the output is realized from a trapezoidal wave output end PZT +.
2. The circuit of claim 1, wherein the central processing unit circuit is connected with a communication circuit, the communication circuit comprises a 2-channel isolated RS232 communication module, and the communication circuit is used for realizing communication between the piezoelectric injection valve controller and the dispensing automation platform.
3. The circuit of claim 1, wherein the power supply terminal DC2 is stabilized by a voltage stabilizing circuit to provide a stabilized PZT-based voltage supply, the positive electrode of the piezoelectric ceramic of the piezoelectric injector is the output terminal PZT + of the trapezoidal wave supply, and the negative electrode of the piezoelectric ceramic is the stabilized PZT-based voltage supply to increase the output power of the piezoelectric ceramic.
4. The dual piezo jet valve controller circuit of claim 3, wherein said regulation circuit comprises a resistor R255, a capacitor C185, a zener diode Z6, and a capacitor C186;
the power supply end DC2 is connected with one end of a resistor R255, the other end of the resistor R255 is connected with the negative end of a voltage stabilizing diode Z6, and two ends of a capacitor C185 are connected with the positive end and the negative end of the voltage stabilizing diode Z6;
the negative end of the voltage stabilizing diode Z6 is the output end of a stabilized voltage power supply PZT-, a capacitor C180 is arranged between the stabilized voltage power supply PZT + and the trapezoidal wave output end PZT +, the positive end of the voltage stabilizing diode Z6 is a current sampling end PZT-B-I, a capacitor C186 is arranged between the output end of the stabilized voltage power supply PZT-and the current sampling end PZT-B-I, and a resistor R268 is arranged between the current sampling end PZT-B-I and the grounding end.
5. The circuit of claim 4, wherein the gate of MOS transistor Q21 is connected to drive pin HO of half-bridge driver U18, and the gate of MOS transistor Q22 is connected to drive pin LO of half-bridge driver U18; and the common terminal is connected to a VS pin of a half-bridge driver U18;
a resistor R264 is arranged between the source of the MOS transistor Q22 and the ground, and the source of the MOS transistor Q22 is the current sampling terminal SHORT _ B.
6. The circuit of claim 5, wherein an ADC sampling circuit is further arranged between the piezoelectric injection valve driving circuit and the main control MCU, and is connected to a current sampling terminal SHORT _ B.
7. The circuit of claim 1, wherein the central processing unit circuit is electrically connected to an optocoupler input/output circuit, which comprises a 4-channel optocoupler input circuit and a 4-channel optocoupler output circuit.
8. The dual-piezoelectric injection valve controller circuit according to claim 1, wherein the central processing unit circuit is electrically connected with a MOS heating control circuit, and the MOS heating control circuit comprises a push-pull circuit, a MOS tube Q26 and a heating rod;
a resistor R65 is arranged between the output end of the push-pull circuit and the grid electrode of the MOS tube Q26, the heating rod is arranged between the drain electrode of the MOS tube Q26 and a power supply VCC, and a resistor R69 is arranged between the source electrode of the MOS tube Q26 and the grounding end.
9. The dual piezo jet valve controller circuit of claim 8, wherein said push-pull circuit comprises transistor Q27, transistor Q25, and transistor Q28;
the control end of the master control MCU is connected with the base electrode of a triode Q27, the collector electrode of a triode Q27 is electrically connected with the base electrode of a triode Q25 and the base electrode of a triode Q28 respectively, a resistor R64 is arranged between the collector electrode of the triode Q27 and the collector electrode of a triode Q25, and the collector electrode of the triode Q25 is connected to a power supply port;
an emitter of the triode Q27 is grounded with a collector of the triode Q28, and a resistor R71 is arranged between the collector and the emitter of the triode Q27;
an emitter of the triode Q25 is connected with an emitter of the triode Q28 to form an output port, and the output port is the output end of the push-pull circuit;
the triode Q27 and the triode Q25 are NPN type triodes, and the triode Q28 is a PNP type triode.
10. The dual piezoelectric injection valve controller circuit according to claim 1, wherein the central processing unit circuit is electrically connected with a memory circuit, a temperature acquisition circuit, an LED control circuit, a display screen control circuit and a piezoelectric injection valve ID information control circuit;
the memory circuit comprises an EEPROM memory connected to the main control CPU;
the temperature acquisition circuit comprises an ADC temperature acquisition module, and the master control MCU is connected with the ADC temperature acquisition module in an SPI mode;
the piezoelectric injection valve ID information control circuit comprises a single bus memory, and the main control MCU reads the ID value and stores the dispensing frequency record in real time through the communication with the single bus memory.
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| CN202110479286.6A CN113285597A (en) | 2021-04-30 | 2021-04-30 | Dual-piezoelectric injection valve controller circuit |
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| JP2002238262A (en) * | 2001-02-09 | 2002-08-23 | Taiheiyo Cement Corp | Piezo-electric transformer inverter |
| US20070086217A1 (en) * | 2005-10-17 | 2007-04-19 | Monolithic Power System, Inc. | DC/AC convert for driving cold cathode fluorescent lamp |
| CN104763667A (en) * | 2015-04-01 | 2015-07-08 | 浙江毅力汽车空调有限公司 | Air blower speed regulating system of automobile |
| CN208581160U (en) * | 2018-04-26 | 2019-03-05 | 浙江大维高新技术股份有限公司 | A kind of upper half-bridge drive circuit |
| CN112170105A (en) * | 2020-09-18 | 2021-01-05 | 深圳市轴心压电技术有限公司 | Novel piezoelectric ceramic valve drive control system |
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2021
- 2021-04-30 CN CN202110479286.6A patent/CN113285597A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002238262A (en) * | 2001-02-09 | 2002-08-23 | Taiheiyo Cement Corp | Piezo-electric transformer inverter |
| US20070086217A1 (en) * | 2005-10-17 | 2007-04-19 | Monolithic Power System, Inc. | DC/AC convert for driving cold cathode fluorescent lamp |
| CN104763667A (en) * | 2015-04-01 | 2015-07-08 | 浙江毅力汽车空调有限公司 | Air blower speed regulating system of automobile |
| CN208581160U (en) * | 2018-04-26 | 2019-03-05 | 浙江大维高新技术股份有限公司 | A kind of upper half-bridge drive circuit |
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