Adaptive tuning circuit for ultrasonic cleaning machine based on adjusting inductor

Abstract

The utility model discloses a self-adaptive tuning circuit for an ultrasonic cleaning machine based on an adjusting inductor, which belongs to the technical field of circuit control, is applied to the ultrasonic cleaning machine, and consists of a single chip microcomputer, a pre-amplification circuit, a main amplification circuit, a resonance circuit, an isolator and a current detection circuit, the current detection circuit is electrically connected with the pre-amplification circuit and the current detection circuit; the main amplification circuit is electrically connected with the pre-amplification circuit and the resonance circuit, and meanwhile the main amplification circuit is further used for being connected with the mains supply; the isolator is electrically connected with the resonance circuit and the current detection circuit; and the output end of the resonance circuit is externally connected with an ultrasonic vibrator and a cleaning tank of the ultrasonic cleaning machine. According to the utility model, the resonance circuit applied to the large-voltage large-power ultrasonic cleaning machine is designed, and the resonance circuit is higher in precision and higher in efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit control, and more specifically, to an adaptive tuning circuit based on an adjustable inductor for an ultrasonic cleaner. Background Art

[0002] In terms of the technology of adjusting the inductor to achieve resonance, those on the market are more or less the same. However, the adjustable inductor technology must be provided with corresponding matching circuits and process treatments for different applications. The existing patent CN202211170658.8 discloses an adjustable inductor, a method for adjusting inductance, and a switching power supply, which relates to the technical field of inductors, including a first magnetic core and a second magnetic core, and an inductor coil is arranged between the first magnetic core and the second magnetic core. The utility model controls the front-back and up-down movement of the force-applying column by transmitting electricity to the electromagnetic block and the electromagnetic sheet to generate magnetism. On this basis, through the engagement of the inclined teeth in the force-applying column and the threaded shaft, the threaded shaft is controlled to rotate clockwise and counterclockwise, so as to adjust the gap between the opposite ends of the first magnetic core and the second magnetic core, and finally realize the adjustment of the inductance. The above patent is used for a switching power supply. At present, there is no instruction manual for a high-precision self-tuning resonant circuit used in the circuit of a high-voltage and high-power ultrasonic cleaner on the market. This high voltage is usually 220V, and the voltage of the oscillation circuit can reach kilovolts during resonance, and the power can reach hundreds of watts or even kilowatts. Summary of the Utility Model

[0003] In order to solve the above problems, the purpose of the utility model is to provide an adaptive tuning circuit based on an adjustable inductor for an ultrasonic cleaner, so as to fill the technical gap of the resonant circuit applied to a high-voltage and high-power ultrasonic cleaner.

[0004] In order to achieve the above technical purpose, the present application provides an adaptive tuning circuit based on an adjustable inductor for an ultrasonic cleaner. This circuit is applied to an ultrasonic cleaner and is composed of a single-chip microcomputer, a pre-amplification circuit, a main amplification circuit, a resonant circuit, an isolator, and a current detection circuit. Among them,

[0005] The single-chip microcomputer is electrically connected to the pre-amplification circuit and the current detection circuit respectively;

[0006] The main amplification circuit is electrically connected to the pre-amplification circuit and the resonant circuit respectively, and the main amplification circuit is also used to access the commercial power;

[0007] The isolator is electrically connected to the resonant circuit and the current detection circuit respectively;

[0008] The output end of the resonant circuit is externally connected to the ultrasonic oscillator and the cleaning tank of the ultrasonic cleaner.

[0009] Preferably, the single-chip microcomputer is used to generate a PWM wave signal of 3-5V.

[0010] Preferably, the 8th and 9th pins of the single-chip microcomputer generate PWM wave signals.

[0011] Preferably, a pre-amplification circuit is used to obtain the PWM wave signal, perform a primary amplification, generate a first amplified signal, and transmit the first amplified signal to the main amplification circuit;

[0012] The main amplification circuit is used to perform a secondary amplification on the first amplified signal according to the accessed commercial power, and generate a second amplified signal of 200 - 300V.

[0013] Preferably, the resonance circuit includes a matching inductor L2, which forms a resonance circuit after being externally connected to the ultrasonic oscillator and the cleaning tank of the ultrasonic cleaning machine.

[0014] Preferably, the single-chip microcomputer obtains the feedback current of the resonance circuit through an isolator and a current detection circuit in sequence, and generates a PWM wave signal according to the feedback current.

[0015] Preferably, the single-chip microcomputer is also electrically connected to the matching inductor L2, and is used to change the L value of the matching inductor L2. The matching inductor L2 is composed of an inductor, a cylinder inside the inductor, a coil wound around the cylinder, and a magnetic core serving as the outer frame of the inductor. The L value is adjusted by changing the contact area between the magnetic core and the coil.

[0016] Preferably, the single-chip microcomputer is also used to form a resonance circuit with the ultrasonic oscillator and the cleaning tank of the externally connected ultrasonic cleaning machine by changing the L value and the output frequency of the PWM wave signal.

[0017] The present utility model discloses the following technical effects:

[0018] The present utility model designs a resonance circuit applied to a high-voltage and high-power ultrasonic cleaning machine. The resonance circuit has higher precision and stronger efficiency, can be applied to high-power cleaning machines, and the output power is above several hundred watts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is the circuit diagram of the present utility model;

[0021] Figure 2 is the schematic diagram of the circuit structure of the present utility model;

[0022] Figure 3 It is a schematic diagram showing the change in the contact area between the coil and the magnetic core according to the present utility model. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some, but not all, of the embodiments of the present application. Generally, the components of the embodiments of the present application described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application that is required to be protected, but merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0024] As Figures 1 - 3 shown, the present utility model provides an adaptive tuning circuit based on adjusting inductance for an ultrasonic cleaner. This circuit is applied to an ultrasonic cleaner and is composed of a single-chip microcomputer, a pre-amplification circuit, a main amplification circuit, a resonance circuit, an isolator, and a current detection circuit. Among them,

[0025] The single-chip microcomputer is electrically connected to the pre-amplification circuit and the current detection circuit respectively;

[0026] The main amplification circuit is electrically connected to the pre-amplification circuit and the resonance circuit respectively, and at the same time, the main amplification circuit is also used to connect to the commercial power supply;

[0027] The isolator is electrically connected to the resonance circuit and the current detection circuit respectively;

[0028] The output end of the resonance circuit is externally connected to the ultrasonic vibrator and the cleaning tank of the ultrasonic cleaner.

[0029] The pre-amplification circuit mainly consists of Figure 1 two modules, namely pre-amplification circuit + and pre-amplification circuit -, and the peripheral circuits R32, R33, and C18. Their outputs form a pair of differential signals and are sent to T2 for subsequent processing.

[0030] The main amplification circuit consists of two amplification circuit modules and the peripheral circuits R14, C13, R17, C14, C7, and C8. Similarly, two signals are output and sent to T1.

[0031] The resonance circuit consists of L2, Y1, and R10. L2 and R10 are the circuit matching inductance and resistance, and Y1 is the user's device.

[0032] Among them, R32 = 220 ohms; R33 = 20 ohms; C18 = 1 uF; R8 = 470 ohms; R14 = 220 ohms; R17 = 220 ohms; C7 = 2 uF; C8 = 2 uF.

[0033] There are two types of isolators. One is the optical isolator IC4, which avoids the influence of circuit oscillation on the branch to be protected; the other is the mutual inductor T3, which reduces the voltage and avoids the feedback of high-voltage signals to the single-chip microcomputer circuit.

[0034] The current detection circuit is composed of a current detection module and a current correction module. In the figure are devices such as D1, R11, and C10.

[0035] Further preferably, the single-chip microcomputer of the adaptive tuning circuit mentioned in the present invention is used to generate a PWM wave signal of 3 - 5V.

[0036] Further preferably, pins 8 and 9 of the single-chip microcomputer of the adaptive tuning circuit mentioned in the present invention generate a PWM wave signal.

[0037] Further preferably, the pre-amplification circuit of the adaptive tuning circuit mentioned in the present invention is used to acquire the PWM wave signal, perform a primary amplification to generate a first amplified signal, and transmit the first amplified signal to the main amplification circuit;

[0038] The main amplification circuit of the adaptive tuning circuit mentioned in the present invention is used to perform a secondary amplification on the first amplified signal according to the access utility power to generate a second amplified signal of 200 - 300V.

[0039] Further preferably, the resonant circuit of the adaptive tuning circuit mentioned in the present invention includes a matching inductor L2, which forms a resonant circuit after being externally connected to the ultrasonic oscillator and the cleaning tank of the ultrasonic cleaning machine.

[0040] Further preferably, the single-chip microcomputer of the adaptive tuning circuit mentioned in the present invention sequentially obtains the feedback current of the resonant circuit through the isolator and the current detection circuit, and generates a PWM wave signal according to the feedback current.

[0041] Further preferably, the single-chip microcomputer of the adaptive tuning circuit mentioned in the present invention is also electrically connected to the matching inductor L2 and is used to change the L value of the matching inductor L2. Among them, the matching inductor L2 is composed of an inductor, a cylinder inside the inductor, a coil wound around the cylinder, and a magnetic core as the outer frame of the inductor. The L value is adjusted by changing the contact area between the magnetic core and the coil.

[0042] Further preferably, the single-chip microcomputer of the adaptive tuning circuit mentioned in the present invention is also used to form a resonant circuit with the ultrasonic oscillator and the cleaning tank of the externally connected ultrasonic cleaning machine by changing the L value and the output frequency of the PWM wave signal.

[0043] Further preferably, the tuning method of the adaptive tuning circuit mentioned in the present utility model includes the following steps:

[0044] Through a single-chip microcomputer, keep the output frequency of the PWM wave signal unchanged, and obtain the change trend of the feedback signal. When the current becomes smaller, it indicates that it is approaching the resonance frequency; when the current becomes larger, it indicates that it is moving away from the resonance frequency;

[0045] Control the single-chip microcomputer, and according to the change trend, adjust the value of L and / or the output frequency to make the circuit resonate.

[0046] Further preferably, the tuning method of the adaptive tuning circuit mentioned in the present utility model includes the following steps:

[0047] After the ultrasonic oscillator and the cleaning tank of the externally connected ultrasonic cleaner change, obtain the change trend of the feedback signal through the single-chip microcomputer. When the current becomes smaller, it indicates that it is approaching the resonance frequency; when the current becomes larger, it indicates that it is moving away from the resonance frequency;

[0048] Control the single-chip microcomputer, determine the resonance frequency range according to the magnitude of the current of the feedback signal, keep the value of L unchanged, change the output frequency of the PWM wave signal, and obtain the change trend. When the current is the smallest and unchanged, a resonant circuit is formed. Otherwise, finely adjust the value of L, and then determine the value of L according to the current change.

[0049] Embodiment: Figure 1 It is a voltage power amplification circuit. Among them, IN_2 and IN_1 of J1 are the branches for outputting the feedback current, and then the current is converted into voltage and transmitted to the single-chip microcomputer. First, keep the inductance unchanged. First, the single-chip microcomputer sweeps the frequency within a certain range. During the frequency sweeping process, according to the magnitude of the above-mentioned feedback current, initially determine the resonance frequency range. Because a single-chip microcomputer is used, the stepping accuracy is not high. So at this time, keep the frequency unchanged, then finely adjust the inductance, and then determine the value of the inductance according to the current change.

[0050] The amplitude of the PWM wave output by the single-chip microcomputer is approximately 3 - 5V. After being amplified by the main power supply of the commercial power, it is 200 - 300V, and the output power is several hundred watts

[0051] When the resonant circuit is in the most perfect state, the voltage can reach thousands of volts and generally works in a state of several hundred volts.

[0052] Such as Figure 1The approximate voltage amplification circuit diagram shown has the microcontroller output on the left connected to J1. Pins 8 and 9 of the microcontroller generate a PWM wave signal, which is amplified by the intermediate amplification circuit. On the right, N220V and L220V are the mains input ports. The amplitude of the PWM wave is amplified to about 200V and then output to out+ and out- on the right through TR7. L2 is a matching inductor, and an ultrasonic oscillator and a cleaning tank are externally connected. The external device can be equivalent to a capacitor, so the output circuit is equivalent to an LC resonance circuit. When the circuit resonates, the best cleaning effect can be achieved.

[0053] However, the external environment is constantly changing and irregular, that is, for the equivalently derived capacitor, the capacitance value is changing. To maintain circuit resonance, according to f = , it is necessary to achieve:

[0054] 1. Keep the resonance frequency f unchanged and change the L value in the opposite direction to achieve resonance again;

[0055] 2. When C changes, change the output frequency f of the PWM to match the new resonance frequency.

[0056] The present utility model starts from these two aspects simultaneously, that is, changing both L and f to finally achieve resonance.

[0057] The method for changing L is: change the contact area between the coil and the magnetic core. The schematic diagram is as Figure 3 shown.

[0058] The right part is the inductor, and the right part is the lead screw. There is a coil wound around the cylinder inside the inductor, and the outer square is the magnetic core. Controlling the distance between the two magnetic cores can change the inductance value. The right half-frame is fixed on the machine body, and the left half-frame is fixed on the right lead screw. By rotating the lead screw, the left half-frame can be controlled to move left and right, thereby controlling the value of the inductor. The movement of the lead screw is controlled by the microcontroller through a servo mechanism. The advantage is that the control accuracy is relatively high.

[0059] The method for changing f is: the microcontroller controls the output frequency of the PWM. A feedback is connected to the right output part of TR7 in Figure 1 . After circuit conditioning, the current value is transmitted to the microcontroller. During the debugging stage, when the current becomes smaller, it indicates that it is approaching the resonance frequency; when the current becomes larger, it indicates that it is moving away from the resonance frequency. This guides the frequency output of the microcontroller. When the current is the smallest and remains unchanged, it indicates that this is the resonance frequency at this time.

[0060] The present utility model is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present utility model. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one Figure 1 flow or multiple flows and / or blocks Figure 1 or means for implementing the functions specified in one block or multiple blocks.

[0061] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0062] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model also intends to include these modifications and variations.

Claims

1. An adaptive tuning circuit for an ultrasonic cleaning machine based on adjustable inductance, characterized in that: This circuit is used in ultrasonic cleaning machines and consists of a single-chip microcomputer, a preamplifier circuit, a main amplifier circuit, a resonant circuit, an isolator and a current detection circuit. The single chip microcomputer is electrically connected to the preamplifier circuit and the current detection circuit respectively; The main amplifier circuit is electrically connected to the preamplifier circuit and the resonant circuit respectively, and the main amplifier circuit is also used to access the mains power; The isolator is electrically connected to the resonant circuit and the current detection circuit respectively; The output end of the resonant circuit is externally connected to the ultrasonic vibrator and the cleaning tank of the ultrasonic cleaning machine.

2. The adaptive tuning circuit for ultrasonic cleaning machine based on adjusting inductance according to claim 1, characterized in that: The single chip microcomputer is used to generate a 3-5V PWM wave signal.

3. The adaptive tuning circuit for ultrasonic cleaning machine based on adjusting inductance according to claim 2, characterized in that: Pins 8 and 9 of the single chip microcomputer generate the PWM wave signal.

4. The adaptive tuning circuit for ultrasonic cleaning machine based on adjusting inductance according to claim 3, characterized in that: The preamplifier circuit is used to obtain the PWM wave signal and perform amplification once to generate a first amplified signal, and transmit the first amplified signal to the main amplifier circuit; The main amplifier circuit is used to perform secondary amplification on the first amplified signal according to the connected mains power to generate a second amplified signal of 200-300V.

5. The adaptive tuning circuit for ultrasonic cleaning machine based on adjusting inductance according to claim 4, characterized in that: The resonant circuit includes a matching inductor L2, which is used to form a resonant circuit after being externally connected to the ultrasonic vibrator and the cleaning tank of the ultrasonic cleaning machine.

6. The adaptive tuning circuit for ultrasonic cleaning machine based on adjusting inductance according to claim 5, characterized in that: The single chip microcomputer obtains the feedback current of the resonant circuit through the isolator and the current detection circuit in sequence, and generates the PWM wave signal according to the feedback current.

7. The adaptive tuning circuit for ultrasonic cleaning machine based on adjusting inductance according to claim 6, characterized in that: The single chip microcomputer is also electrically connected to the matching inductor L2, and is used to change the L value of the matching inductor L2, wherein the matching inductor L2 is composed of an inductor, a cylinder inside the inductor, a coil wound on the cylinder, and a magnetic core serving as an outer frame of the inductor, and the L value is adjusted by changing the contact area between the magnetic core and the coil.

8. The adaptive tuning circuit for ultrasonic cleaning machine based on adjusting inductance according to claim 7, characterized in that: The single chip microcomputer is also used to change the L value and the output frequency of the PWM wave signal so that the matching inductor L2 forms the resonant circuit with the ultrasonic vibrator and cleaning tank of the external ultrasonic cleaning machine.

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