KR-102963807-B1 - AN ULTRASONIC GENERATOR FOR AN ULTRASONIC CLEANING MACHINE

KR102963807B1KR 102963807 B1KR102963807 B1KR 102963807B1KR-102963807-B1

Abstract

An ultrasonic cleaner generator according to one embodiment of the present invention relates to an ultrasonic cleaner generator that drives at least one ultrasonic vibrator included in an ultrasonic cleaner, comprising: a rectifier unit that rectifies an external AC power source to generate a first DC power source; a voltage correction unit that corrects the voltage of the first DC power source to generate a second DC power source; an output unit that generates an output signal based on the second DC power source and applies it to the ultrasonic vibrator; a sensing unit that detects a current and a voltage of at least one of the rectifier unit, the voltage correction unit, and the output unit; and a control unit that controls at least one of the voltage correction unit and the output unit based on the current or voltage detected by the sensing unit.

Inventors

전상권
김재명
홍정흠
박정철
변현영

Assignees

주식회사 지텔글로벌

Dates

Publication Date: 20260512
Application Date: 20230609

Claims (11)

In an ultrasonic cleaner generator that drives at least one ultrasonic vibrator included in an ultrasonic cleaner, A rectifier unit that rectifies an external AC power source to generate a first DC power source; A voltage correction unit that corrects the voltage of the first DC power source to generate a second DC power source; An output unit that generates an output signal based on the second DC power source and applies it to the ultrasonic transducer; A sensing unit for detecting current and voltage of at least one of the above rectification unit, voltage correction unit, and output unit; and A control unit that controls at least one of the voltage correction unit and the output unit based on the current or voltage detected by the sensing unit; Includes, The above voltage correction unit is, A voltage correction unit that corrects the first DC power received from the above rectification unit; and A converter that decomposes the power output from the above-mentioned voltage compensation unit into high frequency and then outputs it again as a second DC power, which is a DC power; Includes, An ultrasonic cleaner generator characterized by the above voltage correction unit receiving feedback on at least one of the voltage and current of the second DC power source, correcting the voltage of the first DC power source, and transmitting it to the converter.
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In claim 1, An ultrasonic cleaner generator characterized by the above control unit calculating the resonance frequency of the ultrasonic vibrator based on the power consumption obtained from the detection result of the above sensing unit, and then setting the resonance frequency as the frequency of the above output signal.
In claim 3, An ultrasonic cleaner generator characterized by the above control unit sweeping the frequency of the output signal according to a preset process while the magnitude of the output signal is fixed, detecting the frequency at which the power consumption is minimized, and then setting it as the resonant frequency.
In claim 4, the process is, A first process of sweeping the frequency of the output signal in a preset first step within a preset first frequency range at the initial start of the above ultrasonic cleaner generator; and A second process of sweeping the frequency of the output signal in a preset second step within a preset second frequency range at preset intervals during the cleaning process using the above-mentioned ultrasonic cleaner generator; Includes, An ultrasonic cleaner generator characterized in that the first frequency range is wider than the second frequency range, and the first step is larger than the second step.
In claim 5, When the above control unit sweeps the frequency of the output signal according to the above first process, An ultrasonic cleaner generator characterized by the above-described control unit determining an upper frequency limit and a lower frequency limit during frequency sweeping by stopping sweeping to the next step when the range of change of a control parameter generated based on at least one of an input current/voltage and an output current/voltage is greater than or equal to a preset value.
In claim 6, When the above control unit sweeps the frequency of the output signal according to the above second process, The above control unit calculates the resonance frequency within the upper and lower frequency limits at preset intervals, The resonant frequency of the previous cycle is set as the first reference frequency, and power consumption is measured for each of the first reference frequency, a first frequency obtained by adding a preset frequency to the first reference frequency, and a second frequency obtained by subtracting a preset frequency from the first reference frequency. An ultrasonic cleaner generator characterized by setting the frequency at which the lowest power is consumed among a first reference frequency, a first frequency, and a second frequency as the second reference frequency, and then sweeping within a preset frequency range based on the second reference frequency to calculate the resonance frequency of the current cycle.
In claim 3, The above ultrasonic cleaner generator is connected to a plurality of ultrasonic vibrators connected in parallel with each other, and A transducer abnormality detection unit that indicates that an abnormality has occurred in at least one of a plurality of ultrasonic transducers when the difference between the power consumption and the reference power consumption is greater than or equal to a preset value when the output signal generated by setting the above resonant frequency as the frequency of the above output signal is applied to the above ultrasonic transducer; An ultrasonic cleaner generator characterized by further including
In claim 1, It further includes an output adjustment unit for a user to adjust the output applied to the ultrasonic vibrator; and An ultrasonic cleaner generator characterized in that the above-mentioned output adjustment unit is configured to adjust the output in watts.
In claim 1, the output unit is, A half-bridge circuit section that converts the above-mentioned second DC power source into AC power source; and An impedance matching part for matching the impedance with a sink bowl to which the above-mentioned ultrasonic vibrator is attached; Includes, The above impedance matching unit includes a plurality of inductors having mutually different inductances and a plurality of relay elements for electrically connecting each of the inductors, and An ultrasonic cleaner generator characterized in that the control unit controls at least one of the plurality of relay elements based on at least one of the number of ultrasonic vibrators detected by the sensing unit and the state of the sink bowl.
In claim 1, An ultrasonic cleaner generator characterized in that, when a De-GAS mode is set to remove fine air inside the ultrasonic cleaner, the control unit rapidly changes the amplitude of the output signal.

Description

Ultrasonic Cleaner Generator The present invention relates to an ultrasonic cleaner generator, and more specifically, to a generator for an ultrasonic cleaner for generating an electrical signal transmitted to an ultrasonic vibrator equipped in an ultrasonic cleaner. Sounds that have a frequency higher than the audible frequency range (20 to 20,000 Hz), which is the frequency range that humans can hear, are called ultrasonic waves. Due to their high frequency, these ultrasonic waves have relatively strong energy, travel well in water, and have the property of being easily reflected because of their short wavelength. Ultrasonic cleaners utilize these properties to clean objects by applying ultrasound to a cleaning solution to remove foreign substances attached to the object; since ultrasound promotes molecular motion, it is advantageous for removing foreign substances adhering to the surface of an object. Meanwhile, conventional ultrasonic cleaners had the problem of low power efficiency and unnecessary power consumption because they were not equipped with a driving process that takes into account the individual characteristics of the ultrasonic transducers and the number of ultrasonic transducers. Meanwhile, the following prior art documents disclose only details regarding an ultrasonic generator that can be used in an ultrasonic cleaner capable of cleaning the surface of fruits or tableware without damaging it by generating ultrasound, and do not disclose the technical gist of the present invention. FIG. 1 is a block diagram briefly illustrating the configuration of an ultrasonic cleaner generator according to one embodiment of the present invention. Figure 2 is a graph showing the change in power consumption output by the ultrasonic vibrator according to the amount of water contained in the ultrasonic cleaner. Figure 3 is a graph showing the resonance frequency measured by an impedance analyzer according to the amount of water contained in the ultrasonic cleaner. Figure 4 is a graph showing the power consumption collected while varying the frequency after fixing the output of the 8 ultrasonic transducers at 160 Watts. FIG. 5 is a flowchart illustrating an example of an ultrasonic cleaner generator tracking a resonant frequency according to an embodiment of the present invention. Figure 6 is a figure showing the equivalent circuit of an ultrasonic transducer. Figure 7 is a graph showing an example of an output signal when the De-GAS mode is set. Preferred embodiments according to the present invention will be described in detail with reference to the attached drawings, provided that identical or similar components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted. Furthermore, in describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such descriptions could obscure the essence of the invention. Additionally, it should be noted that the attached drawings are intended only to facilitate an understanding of the concept of the present invention and should not be interpreted as limiting the concept of the present invention. An ultrasonic cleaner generator according to one embodiment of the present invention will be described below with reference to FIGS. 1 to 7. An ultrasonic cleaner generator according to one embodiment of the present invention relates to an ultrasonic cleaner generator (10) that drives at least one ultrasonic vibrator (20) included in an ultrasonic cleaner, and is configured to include a rectification unit (100), a voltage correction unit (200), an output unit (300), a sensing unit (400), and a control unit (500) as shown in FIG. 1. The rectifier unit (100) performs the function of generating a first DC power by rectifying an external AC power source (40), and the voltage correction unit (200) performs the function of generating a second DC power by correcting the voltage of the first DC power source generated by the rectifier unit (100). The output unit (300) performs the function of generating an output signal based on the second DC power source and then applying it to the ultrasonic vibrator (20). The sensing unit (400) performs the function of detecting a current and a voltage of at least one of the above-described rectifier unit (100), voltage correction unit (200), and output unit (300), and the control unit (500) controls at least one of the rectifier unit (100), voltage correction unit (200), and output unit (300) based on the current or voltage detected by the sensing unit (400). In particular, the voltage correction unit (200) described above is configured to maintain a constant output even in an unstable state due to changes in the input power supply, and this will be explained in more detail below. The voltage of the external AC power source (40) is typically treated as 220V ac , within the range of 207V ac to 233V ac based on the standard voltage of S