Enabling circuit of megasonic generator and megasonic generator

Abstract

The invention relates to the technical field of signal processing, and provides an enabling circuit of a megasonic generator and the megasonic generator, in the enabling circuit, an H11L1SR2M chip comprises an ANODE interface, a CATHODE interface, a VO interface, a GND interface and a VCC interface; the ANODE interface is connected with the second end of the first resistor and the first end of the first capacitor; the CATHODE interface is connected with the grounding port, the second end of the first capacitor and the anode of the diode; the cathode of the diode is connected with the first end of the first resistor and the second end of the third resistor; the first end of the third resistor is connected with the first power supply; the VO interface is connected with the second end of the second resistor; the GND interface is connected with the second end of the second capacitor and the grounding port; the VCC interface is connected with the second power supply and the first end of the second resistor. According to the scheme, stable signal transmission is realized, and the anti-interference capability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of signal processing, and in particular to an enabling circuit of a megasonic wave generator and a megasonic wave generator. Background Art

[0002] Megasonic generator, also known as megasonic generator box, megasonic source, megasonic power supply, is an important component of megasonic cleaning machine. Its quality and matching degree directly determine the cleaning effect of the cleaning machine.

[0003] The function of the megasonic generator is to convert the power supply voltage (220V / 50Hz or 380V / 60Hz) used in our daily life into a high-frequency AC signal that matches the megasonic transducer. The principle is: the signal generator generates a pulse signal or a sine signal of a specific frequency, and the megasonic generator increases the frequency of this signal to a certain value, that is, the frequency of the transducer. The megasonic frequencies generally used in megasonic equipment are 20KHz, 28KHz, 40KHz, and 60KHz. The power amplifier can be in many forms, such as vacuum tube class A amplifier, class A and B amplifier, transistor class A or class B amplifier, transistor switching amplifier, etc., and the power is generally between 50W and 3000W. The frequency signal generated by the signal generator needs to be impedance matched after passing through the power amplifier, so that the output impedance matches the transducer, and the transducer is driven to convert the electrical signal into mechanical vibration, thereby performing cleaning work. At present, the megasonic generators used in the ultrasonic industry are mainly divided into self-excited and other-excited power supplies.

[0004] The communication circuit is used as the serial communication interface between the upper computer and the lower computer to realize the data exchange between the megasonic generator and external devices (such as programmable logic controller PLC, server or PC, etc.). RS485 communication (half-duplex asynchronous serial communication) has the advantages of long transmission distance (up to several thousand meters), high transmission rate (up to 10Mbps), strong anti-interference ability (differential signal) and support for multi-node communication. Therefore, it is very beneficial to use RS485 to form a communication circuit to transmit signals.

[0005] Through the RS485 communication interface, the megasonic generator can accept setting instructions from external devices such as PLC, server or PC to achieve fast setting and accurate operation. This is especially important for precision cleaning systems in the medical, electronic, automotive and other industries that require precise control of megasonic energy transmission. The RS485 communication circuits on the market currently have problems with signal attenuation and communication instability caused by long communication lines or impedance mismatch. The communication environment also has a great impact on the stability of RS485 communication, and additional anti-interference measures need to be taken to ensure the reliability of communication. Since the enable signal is an important input port in the signal transmission process, its accuracy is also crucial to whether the signal can be transmitted completely and accurately, so the stability and anti-interference ability of the enable circuit also need to be improved.

[0006] At the same time, since the 485 communication circuit needs to send or receive an enable signal (high or low level) to realize the conversion between the voltage differential signal and the TTL signal, the stability and accuracy of the enable signal are also extremely important. If the enable signal jitters due to excessive noise in actual applications, the high and low level errors will be transmitted, which will in turn lead to signal transmission errors in the communication circuit, that is, errors in the information transmitted by the communication. Therefore, the enable circuit also needs to be improved and optimized for anti-interference to ensure that the enable signal received by the communication circuit is accurate.

[0007] Most of the existing communication circuits rely on 485 chips to achieve communication effects, or add EMC circuits to prevent interference such as surges or lightning strikes, and the anti-interference design of peripheral circuits is insufficient. In application scenarios such as megasonic generators, there are many sources of noise, and no surge protection design is required, so the existing solutions alone cannot meet the needs.

[0008] Therefore, there is an urgent need to provide an enabling circuit and a megasonic wave generator for a megasonic wave generator, which can be used to meet the communication requirements of the megasonic wave generator with high stability and high efficiency, ensure that the enabling circuit has stability and anti-interference properties, and achieve stable transmission of signals with strong anti-interference capabilities.

[0009] The above information disclosed in the Background section is only for enhancement of understanding of the background of the present application and therefore it may contain information that does not constitute the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0010] The main purpose of the present invention is to overcome the problems of instability and weak anti-interference of the enabling circuit of the megasonic wave generator, and to provide an enabling circuit and a megasonic wave generator for meeting the communication requirements of the megasonic wave generator with high stability and high efficiency, ensuring that the enabling circuit has stability and anti-interference, and realizing stable transmission of signals with strong anti-interference ability.

[0011] As a first aspect of the present invention, the present invention provides an enabling circuit of a megasonic wave generator, comprising an H11L1SR2M chip, a first power supply, a second power supply, a diode, a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, and a ground port;

[0012] The H11L1SR2M chip includes ANODE interface, CATHODE interface, V O Interface, GND interface, V CC interface;

[0013] A diode consists of a cathode and an anode;

[0014] The first capacitor includes a first terminal and a second terminal, and the second capacitor includes a first terminal and a second terminal;

[0015] The first resistor includes a first end and a second end, the second resistor includes a first end and a second end, and the third resistor includes a first end and a second end;

[0016] The ANODE interface is connected to the second end of the first resistor and the first end of the first capacitor;

[0017] The CATHODE interface is connected to the ground port, the second end of the first capacitor, and the anode of the diode; the cathode of the diode is connected to the first end of the first resistor and the second end of the third resistor; the first end of the third resistor is connected to the first power supply;

[0018] V O The interface is connected to the second end of the second resistor;

[0019] The GND interface is connected to the second power supply and the first end of the second resistor;

[0020] V CC The interface is connected to the second power supply and the first end of the second resistor.

[0021] According to an exemplary embodiment of the present invention, the resistance value of the first resistor is 330Ω, the resistance value of the second resistor is 180Ω, and the resistance value of the third resistor is 2000Ω.

[0022] According to an exemplary embodiment of the present invention, the capacitance of the first capacitor is 100 nF, and the capacitance of the second capacitor is 10 nF.

[0023] According to an exemplary embodiment of the present invention, the first power supply is 24V, and the second power supply is 3.3V.

[0024] According to an exemplary embodiment of the present invention, the diode is 1N4004.

[0025] According to an exemplary embodiment of the present invention, the enabling circuit of the megasonic wave generator further includes an input port and an output port, wherein the input port is connected to the first end of the first resistor; the output port is connected to V O Interface connection.

[0026] According to an exemplary embodiment of the present invention, the enabling circuit of the megasonic wave generator further includes a first test point and a second test point, wherein the first test point is connected to the first end of the first resistor; the second test point is connected to V O Interface connection.

[0027] As a second aspect of the present invention, the present invention provides a megasonic wave generator, comprising a megasonic wave generating circuit, an enabling circuit of the megasonic wave generator, and a communication circuit of the megasonic wave generator;

[0028] The megasonic wave generating circuit is connected to the communication circuit of the megasonic wave generator and is used to generate megasonic waves;

[0029] The communication circuit of the megasonic wave generator is used to receive communication instructions and control the megasonic wave generating circuit to generate megasonic waves;

[0030] The enabling circuit of the megasonic wave generator is connected to the megasonic wave generating circuit and is used to generate an enabling signal.

[0031] The advantages of the present invention are:

[0032] The present invention improves the enabling circuit, adopts the chip with the best performance, integrates the optocoupler isolation and Schmitt trigger, sets a low-pass filter outside the chip to pre-process the IO signal, and adds a diode to protect the internal optocoupler module of the H11L1SR2M chip to ensure the stability and security of the enabling interface. The isolation design, resistor matching design, and filter design of this solution minimize the interference of circuit and external noise, ensure the stability and anti-interference of the enabling circuit, and achieve high-stability and high-efficiency transmission of communication signals. The structural design of this solution is ingenious and reasonable, effectively simplifies the circuit and achieves the best optimization effect. It can be applied to the design of communication interfaces in industrial applications, which is conducive to wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other objects, features and advantages of the present application will become more apparent by describing in detail the exemplary embodiments thereof with reference to the accompanying drawings. The accompanying drawings described below are only some embodiments of the present application, and it is clear to a person skilled in the art that other accompanying drawings can be obtained from these accompanying drawings without creative effort.

[0034] Figure 1 A circuit diagram of an enabling circuit is schematically shown.

[0035] Figure 2The pin diagram of the H11L1SR2M chip is schematically shown. DETAILED DESCRIPTION

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0037] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0038] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0039] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0040] It should be understood that although the terms first, second, third, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another component. Therefore, the first component discussed below can be referred to as the second component without departing from the teachings of the concepts of the present application. As used herein, the term "and / or" includes any one of the associated listed items and all combinations of one or more.

[0041] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present application, and therefore cannot be used to limit the scope of protection of the present application.

[0042] According to a first specific embodiment of the present invention, the present invention provides a megasonic wave generator, comprising a megasonic wave generating circuit, an enabling circuit of the megasonic wave generator and a communication circuit of the megasonic wave generator.

[0043] The megasonic wave generating circuit is connected to the communication circuit of the megasonic wave generator and is used for generating megasonic waves.

[0044] The communication circuit of the megasonic wave generator is used to receive communication instructions and control the megasonic wave generating circuit to generate megasonic waves.

[0045] The enabling circuit of the megasonic wave generator is connected to the megasonic wave generating circuit and is used to generate an enabling signal.

[0046] The communication circuit is designed based on RS485 communication principle and Modbus communication protocol, and the enabling circuit is designed based on optocoupler isolation and Schmitt trigger.

[0047] The specific principle of RS485 communication is: the serial port controller in the node uses RX and TX signal lines to connect to the 485 transceiver, and then the 485 transceiver is connected to the network bus through differential lines. TTL signal transmission is generally used between the serial port controller and the transceiver, and differential signal transmission is used between the transceiver and the bus. The 485 transceiver is used to convert TTL level and RS485 level. When sending data, the TX signal of the serial port controller is converted into a differential signal by the transceiver and transmitted to the bus. When receiving data, the differential signal on the bus is converted into a TTL signal by the transceiver, and then transmitted to the serial port controller through the RX pin to realize the communication conversion of different signals between serial ports. The Modbus communication protocol used in this process is the communication mechanism of the signal on the bus, that is, the signal transmission process follows the master-slave communication mode of host polling and slave response. During the communication process, the signal is packaged into a data packet of the Modbus protocol type to realize the accurate communication between the "one master and multiple slaves" machines between the upper and lower computers.

[0048] The communication circuit comprises a TDA515S485HC chip, and the TDA515S485HC chip comprises an RE interface and a DE interface.

[0049] The RE interface and the DE interface are connected to the enabling circuit and are used to access the enabling signal EN to control the output state of the differential signal.

[0050] like Figure 1 As shown, the enabling circuit includes an H11L1SR2M chip, a first power supply, a second power supply, a diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a ground port, an input port PIN, an output port PORT, a first test point TP1 and a second test point TP2.

[0051] like Figure 2 As shown, the H11L1SR2M chip includes ANODE interface, CATHODE interface, NC interface, V O Interface, GND interface, V CC interface. Figure 2 The table in the lower right corner is the truth table of the chip, which means that when the level between pins 1 and 2 of the chip is high, Vo outputs a low level, otherwise it outputs a high level.

[0052] The diode D1 includes a cathode and an anode. The diode D1 adopts a model of 1N4004.

[0053] The first capacitor C1 includes a first terminal and a second terminal, and the second capacitor C2 includes a first terminal and a second terminal. The capacitance of the first capacitor C1 is 100nF, and the capacitance of the second capacitor C2 is 10nF.

[0054] The first resistor R1 includes a first end and a second end, the second resistor R2 includes a first end and a second end, and the third resistor R3 includes a first end and a second end. The resistance of the first resistor R1 is 330Ω, the resistance of the second resistor R2 is 180Ω, and the resistance of the third resistor R3 is 2000Ω.

[0055] The first power supply is 24V, and the second power supply is 3.3V.

[0056] The ANODE interface is connected to the second end of the first resistor R1 and the first end of the first capacitor C1;

[0057] The CATHODE interface is connected to the ground port, the second end of the first capacitor C1, and the anode of the diode D1; the cathode of the diode D1 is connected to the first end of the first resistor R1 and the second end of the third resistor R3; the first end of the third resistor R3 is connected to the first power supply.

[0058] V O The interface is connected to the second end of the second resistor R2.

[0059] The GND interface is connected to the second power supply and the first end of the second resistor R2.

[0060] V CC The interface is connected to the second power supply and the first end of the second resistor R2.

[0061] The input port PIN is connected to the first end of the first resistor R1; the output port PORT is connected to V O Interface connection.

[0062] The first test point TP1 is connected to the first end of the first resistor R1; the second test point TP2 is connected to V O Interface connection. The first test point TP1 and the second test point TP2 are used to test the voltage and current of the line, which is convenient for testing.

[0063] The NC interface is unloaded.

[0064] The H11L1SR2M chip was selected. The input pull-up power supply module includes a first power supply and a third resistor R3. An open-drain circuit structure is adopted. The first power supply is connected to the chip ANODE interface (pin 1) through the third resistor R3. The signal is connected to the input protection circuit. The input protection module includes a diode D1 and a low-pass filter. The first resistor R1 and the first capacitor C1 form a low-pass filter. The anode of the diode D1 is connected to the ground port, and the cathode is connected to the first resistor R1. The whole is connected in parallel with the low-pass filter. The other end of the first resistor R1 is connected to the chip ANODE interface and the first capacitor C1. The other end of the first capacitor C1 is connected to the ground port. The output pull-up power supply module includes a second power supply, a second resistor R2, and a second capacitor C2. The second power supply is connected to the chip V CC The interface (pin 6) is connected to the second resistor R2, and the other end of the second resistor R2 is connected to the chip V O The interface (pin 4) is connected to the output signal, and the second capacitor C2 is connected in parallel with the chip V CC The chip GND interface is also connected to the ground port between the interface and the GND interface (pin 5). When the external device GPIO signal is high, the internal optocoupler of the chip is turned on, and the signal is lower than the lower threshold voltage of the Schmitt trigger after passing through the internal signal conversion module, and the output is low; when the external device GPIO signal is low, the internal optocoupler of the chip is not turned on, and the signal is higher than the lower threshold voltage of the Schmitt trigger after passing through the internal signal conversion module, and the output is high. If there is a large noise in the external device GPIO signal channel, due to the hysteresis effect of the Schmitt trigger, if the input signal of the input port PIN is high at this time, the output of the output port PORT is low. After passing through the internal signal conversion module, the transient low-level noise cannot make the converted signal higher than the upper threshold voltage of the Schmitt trigger, so the output signal can remain stable and no false triggering will occur.

[0065] GPIO (General-Purpose Input / Output) is a general-purpose input / output interface, which is an interface on a microcontroller or microcontroller for connecting external devices. GPIO can be configured as an input mode to read external signals, or as an output mode to control external devices. Various control functions can be achieved by controlling the level state of GPIO through software.

[0066] The H11L1SR2M chip used in the enabling circuit integrates both optocoupler isolation and Schmitt trigger. An RC low-pass filter is added on the left side of the chip to pre-process the IO signal, and a diode D1 is added to protect the internal optocoupler module of the H11L1SR2M chip to ensure the stability and security of the enabling interface.CC The GND pin is isolated by a second capacitor C2 decoupling capacitor, and the output port PORT is connected to the second power supply through a second resistor R2 as a pull-up resistor, and finally an enable signal is output.

[0067] The H11L1SR2M chip was selected. The enabling circuit based on this chip utilizes the hysteresis effect of optocoupler isolation and Schmitt trigger, so that the noise in the GPIO line (the signal transmitted from the previous circuit, the input signal) of the external device connected to the megasonic generator is isolated, preventing the internal circuit of the megasonic generator from being affected by external electromagnetic interference. At the same time, the high noise tolerance of the Schmitt trigger greatly improves the anti-interference ability of the interface, solves the problem of false triggering caused by excessive line noise, and ensures the stability and safety of the enabling interface.

[0068] Since the enable signal is a step signal, it can be approximated as a periodic square wave signal with an almost infinite period, and the requirement for rapidity is not high, so a low-pass filter is used to suppress the pulse group noise. Since the pulse group noise amplitude is large and the LED conduction voltage is small, the filter cutoff frequency needs to be low enough to make the high-frequency noise component in the signal decay quickly and suppress it within a small enough range to prevent the abnormal conduction of the LED. The low-pass filter R = 330Ω, C = 100nF obtained by calculation and simulation. At the same time, the reverse parallel diode 1N4004 is used to prevent the high-amplitude reverse pulse from breaking through the LED to achieve a protective effect.

[0069] The input pull-up module of the enabling circuit includes a 24V power supply and a 2kΩ resistor, and is connected between the signal and the input protection circuit using an open-drain circuit structure. The input protection module includes a low-pass filter composed of a 1N4004 diode, a 330Ω resistor, and a 10uF capacitor, which is used to pre-process the IO signal to ensure the stability and safety of the enabling interface.

[0070] The output pull-up power module of the enabling circuit includes a 3.3V power supply, a 180Ω resistor, and a 100uF capacitor. The 3.3V power supply VCC is connected to the chip V CC The output voltage pin is pulled up to VCC through the second resistor R2 to maintain the high level state of the power supply, eliminate the floating signal, and keep the high and low levels of the final output enable signal clean and accurate.

[0071] The present invention improves the enabling circuit, adopts the chip with the best performance, integrates the optocoupler isolation and Schmitt trigger, sets a low-pass filter outside the chip to pre-process the IO signal, and adds a diode to protect the internal optocoupler module of the H11L1SR2M chip to ensure the stability and security of the enabling interface. The isolation design, resistor matching design, and filter design of this solution minimize the interference of circuit and external noise, ensure the stability and anti-interference of the enabling circuit, and achieve high-stability and high-efficiency transmission of communication signals. The structural design of this solution is ingenious and reasonable, effectively simplifies the circuit and achieves the best optimization effect. It can be applied to the design of communication interfaces in industrial applications, which is conducive to wide promotion and application.

[0072] The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the detailed structure, configuration or implementation method described herein; on the contrary, the present invention is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. An enabling circuit for a megasonic wave generator, characterized in that: It includes an H11L1SR2M chip, a first power supply, a second power supply, a diode, a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, and a ground port; The H11L1SR2M chip includes ANODE interface, CATHODE interface, V O Interface, GND interface, V CC interface; A diode consists of a cathode and an anode; The first capacitor includes a first terminal and a second terminal, and the second capacitor includes a first terminal and a second terminal; The first resistor includes a first end and a second end, the second resistor includes a first end and a second end, and the third resistor includes a first end and a second end; The ANODE interface is connected to the second end of the first resistor and the first end of the first capacitor; The CATHODE interface is connected to the ground port, the second end of the first capacitor, and the anode of the diode; the cathode of the diode is connected to the first end of the first resistor and the second end of the third resistor; the first end of the third resistor is connected to the first power supply; V O The interface is connected to the second end of the second resistor; The GND interface is connected to the second end of the second capacitor and the ground port; V CC The interface is connected to the second power supply and the first end of the second resistor.

2. The enabling circuit of the megasonic wave generator according to claim 1, characterized in that: The resistance value of the first resistor is 330Ω, the resistance value of the second resistor is 180Ω, and the resistance value of the third resistor is 2000Ω.

3. The enabling circuit of the megasonic wave generator according to claim 1, characterized in that: The capacitance of the first capacitor is 100 nF, and the capacitance of the second capacitor is 10 nF.

4. The enabling circuit of the megasonic wave generator according to claim 1, characterized in that: The first power supply is 24V, and the second power supply is 3.3V.

5. The enabling circuit of the megasonic wave generator according to claim 1, characterized in that: The model of the diode is 1N4004.

6. The enabling circuit of the megasonic wave generator according to claim 1, characterized in that: The device also includes an input port and an output port, wherein the input port is connected to the first end of the first resistor; the output port is connected to V O Interface connection.

7. The enabling circuit of the megasonic wave generator according to claim 1, characterized in that: The device also includes a first test point and a second test point, wherein the first test point is connected to the first end of the first resistor; the second test point is connected to V O Interface connection.

8. A megasonic generator, characterized in that: A megasonic wave generating circuit, an enabling circuit of the megasonic wave generator according to any one of claims 1 to 7, and a communication circuit of the megasonic wave generator; The megasonic wave generating circuit is connected to the communication circuit of the megasonic wave generator and is used to generate megasonic waves; The communication circuit of the megasonic wave generator is used to receive communication instructions and control the megasonic wave generating circuit to generate megasonic waves; The enabling circuit of the megasonic wave generator is connected to the megasonic wave generating circuit and is used to generate an enabling signal.

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