Symmetrical half-bridge driving and current adjusting circuit of ultrasonic cleaning machine

Abstract

The utility model belongs to the technical field of ultrasonic power supplies, and particularly relates to a symmetrical half-bridge driving and current regulating circuit of an ultrasonic cleaning machine, which comprises an input module, a current mutual inductance module, a voltage transformation module, a complementary pulse generation module, a complementary pulse driving module, a power regulating module and a half-bridge isolation transformation amplification module. The utility model aims to provide the symmetrical half-bridge driving and current adjusting circuit of the ultrasonic cleaning machine, which can automatically adjust the duty ratio of the driving pulse width according to a set power value, so as to achieve an accurate and constant current control effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultrasonic power supplies, and in particular relates to a symmetrical half-bridge driving and current regulating circuit for an ultrasonic cleaning machine. Background Art

[0002] Ultrasonic cleaning machines utilize the cavitation, acceleration, and direct flow of ultrasound waves within a liquid to directly or indirectly disperse, emulsify, and exfoliate the contaminant layer, achieving the desired cleaning effect. Ultrasonic cleaning is widely used due to its high efficiency and effectiveness.

[0003] However, in the current ultrasonic cleaning field, one or more small ultrasonic vibrators of the same model and rated power of 15W to 100W are pasted on the surface of the cleaning tank, but the resonant frequency point of each ultrasonic vibrator is basically not the same, and is also affected by many factors such as the water level in the cleaning tank, the vibrator pasting position, the vibrator manufacturing process, temperature, water temperature and water quality, which causes the power output of the ultrasonic cleaning machine to fluctuate and affects the cleaning stability of the cleaning machine. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a symmetrical half-bridge drive and current regulation circuit for an ultrasonic cleaning machine, which can automatically adjust the duty cycle of the drive pulse width according to the set power value, thereby achieving a precise and constant current control effect.

[0005] The utility model is realized through the following technical solutions:

[0006] A symmetrical half-bridge drive and current regulation circuit for an ultrasonic cleaning machine includes an input module, a current mutual induction module, a voltage transformation module, a complementary pulse generation module, a complementary pulse drive module, a power regulation module, and a half-bridge isolation conversion and amplification module;

[0007] Current mutual induction module, used to collect AC power and input AC input signal to the power regulation module;

[0008] The transformer module is used to reduce the voltage of the mains electricity to supply power to the complementary pulse generation module and the current mutual sensing module;

[0009] Complementary pulse generation module, used to generate two complementary pulse signals and oscillation signals;

[0010] The power regulation module is used to read the voltage value of the output end of the current mutual induction module, perform integral comparison based on the read voltage value and the preset value, and output a specific reference regulation signal based on the judgment result;

[0011] A complementary pulse drive module is used to output a power regulation control signal with a specific adjusted duty cycle based on the pulse signal, the oscillation signal and the reference regulation signal;

[0012] The half-bridge isolation conversion and amplification module is used to isolate and amplify the power regulation control signal.

[0013] The transformer module includes an industrial frequency transformer TL1, a linear regulator U1 and a linear regulator U2. The industrial frequency transformer TL1 is used to connect to the mains and output 5V and 12V electrical signals through the linear regulator U1 and the linear regulator U2 respectively.

[0014] The power regulation module includes a single chip microcomputer. In the initial state of the single chip microcomputer, a specific power value is set as a preset value, and an integral comparison is performed based on the read voltage value and the preset value.

[0015] The frequency of the pulse signal is the same as that of the power regulation control signal, and the duty cycle of the pulse signal is greater than or equal to the duty cycle of the power regulation control signal.

[0016] Wherein, the reference adjustment signal is a voltage signal.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides a constant power control circuit and control method for an ultrasonic vibrating screen power supply, which achieves precise and constant current control effect by outputting a power regulation control signal with a specific duty cycle through a current mutual inductance module, a voltage transformation module, a complementary pulse generation module, a complementary pulse drive module, a power regulation module and a half-bridge isolation conversion and amplification module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative effort.

[0020] Figure 1 This is the circuit schematic diagram of the input module and current mutual induction module.

[0021] Figure 2 This is the circuit schematic diagram of the transformer module.

[0022] Figure 3 This is the circuit schematic diagram of the complementary pulse generation module.

[0023] Figure 4 This is the circuit schematic diagram of the complementary pulse drive module.

[0024] Figure 5This is the circuit schematic diagram of the power regulation module.

[0025] Figure 6 This is the circuit schematic diagram of the half-bridge isolation conversion and amplifier module. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] Ultrasonic cleaning machines utilize the cavitation, acceleration, and direct flow of ultrasound waves within a liquid to directly or indirectly disperse, emulsify, and exfoliate the contaminant layer, achieving the desired cleaning effect. Ultrasonic cleaning is widely used due to its high efficiency and effectiveness.

[0030] However, in the current ultrasonic cleaning field, one or more small ultrasonic vibrators of the same model and rated power of 15W to 100W are pasted on the surface of the cleaning tank, but the resonant frequency point of each ultrasonic vibrator is basically not the same, and is also affected by many factors such as the water level in the cleaning tank, the vibrator pasting position, the vibrator manufacturing process, temperature, water temperature and water quality, which causes the power output of the ultrasonic cleaning machine to fluctuate and affects the cleaning stability of the cleaning machine.

[0031] In order to solve the above problems, this embodiment discloses a symmetrical half-bridge drive and current regulation circuit for an ultrasonic cleaning machine, including an input module, a current mutual induction module, a voltage transformation module, a complementary pulse generation module, a complementary pulse drive module, a power regulation module, and a half-bridge isolation conversion and amplification module;

[0032] Current mutual induction module, used to collect AC power and input AC input signal to the power regulation module;

[0033] The transformer module is used to reduce the voltage of the mains electricity to supply power to the complementary pulse generation module and the current mutual sensing module;

[0034] Complementary pulse generation module, used to generate two complementary pulse signals and oscillation signals;

[0035] The power regulation module is used to read the voltage value of the output end of the current mutual induction module, perform integral comparison based on the read voltage value and the preset value, and output a specific reference regulation signal based on the judgment result;

[0036] A complementary pulse drive module is used to output a power regulation control signal with a specific adjusted duty cycle based on the pulse signal, the oscillation signal and the reference regulation signal;

[0037] The half-bridge isolation conversion amplifier module is used to isolate, amplify and output the power regulation control signal.

[0038] In this embodiment, the circuit diagram of the input module can be referred to Figure 1 The input module filters and rectifies the AC mains into high-voltage DC power, which is generally around 300V. The transformer module includes an industrial frequency transformer TL1, a linear voltage regulator U1, and a linear voltage regulator U2. The industrial frequency transformer TL1 is used to connect to the mains and output 5V and 12V electrical signals through the linear voltage regulator U1 and the linear voltage regulator U2, respectively, to power the current mutual induction module and the complementary pulse generation module.

[0039] In this embodiment, the power regulation module includes a single-chip microcomputer. In the initial state of the single-chip microcomputer, the single-chip microcomputer presets a value, performs an integral comparison based on the read voltage value and the preset value, and then obtains a VPOWER1 signal, which is then combined with the DRCT oscillation signal and the complementary drive signal of the complementary pulse generation module to modulate the duty cycle of the input drive complementary signal of the complementary pulse drive module, and finally controls the output power to output a stable power equivalent to the preset value.

[0040] Furthermore, the half-bridge drive part of the half-bridge isolation conversion amplifier module reads DRC and DRD respectively, and converts the 300V high-voltage DC of the input module into isolated and controllable low-voltage constant DC. By adjusting the duty cycle of DRC and DRD, the size of the connector POT1 can be adjusted. The smaller (larger) the duty cycle of DRC and DRD, the lower (higher) the voltage value of the connector POT1. Ultimately, the above regulation achieves constant power of the ultrasound system.

[0041] In summary, this embodiment provides a constant power control circuit and control method for an ultrasonic vibrating screen power supply, which achieves precise and constant current control effect by outputting a power regulation control signal with a specific duty cycle through a current mutual inductance module, a voltage transformation module, a complementary pulse generation module, a complementary pulse drive module, a power regulation module and a half-bridge isolation conversion and amplification module.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A symmetrical half-bridge drive and current regulation circuit for an ultrasonic cleaning machine, characterized in that: It includes input module, current mutual induction module, voltage transformation module, complementary pulse generation module, complementary pulse driving module, power regulation module and half-bridge isolation conversion and amplification module; Current mutual induction module, used to collect AC power and input AC input signal to the power regulation module; The transformer module is used to reduce the voltage of the mains electricity to supply power to the complementary pulse generation module and the current mutual sensing module; Complementary pulse generation module, used to generate two complementary pulse signals and oscillation signals; The power regulation module is used to read the voltage value of the output end of the current mutual induction module, perform integral comparison based on the read voltage value and the preset value, and output a specific reference regulation signal based on the judgment result; A complementary pulse drive module is used to output a power regulation control signal with an adjusted duty cycle according to the pulse signal, the oscillation signal and the reference regulation signal; The half-bridge isolation conversion and amplification module is used to isolate and amplify the power regulation control signal.

2. The symmetrical half-bridge driving and current regulating circuit for an ultrasonic cleaning machine according to claim 1, characterized in that: The transformer module includes an industrial frequency transformer TL1, a linear regulator U1 and a linear regulator U2. The industrial frequency transformer TL1 is used to connect to the mains and output 5V and 12V electrical signals through the linear regulator U1 and the linear regulator U2 respectively.

3. The symmetrical half-bridge driving and current regulating circuit for an ultrasonic cleaning machine according to claim 1, characterized in that: The power regulation module includes a single chip microcomputer. In the initial state of the single chip microcomputer, a power value is set as a preset value, and an integral comparison is performed based on the read voltage value and the preset value.

4. The symmetrical half-bridge driving and current regulating circuit for an ultrasonic cleaning machine according to claim 1, characterized in that: The frequency of the pulse signal is the same as that of the power regulation control signal, and the duty cycle of the pulse signal is greater than or equal to the duty cycle of the power regulation control signal.

5. The symmetrical half-bridge driving and current regulating circuit for an ultrasonic cleaning machine according to claim 1, characterized in that: The reference adjustment signal is a voltage signal.

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