KR100374572B1 - Apparatus and method for elimination of resonance noise in supersonic scrubber - Google Patents

Abstract

The present invention is to provide a resonant noise removing device and method of the ultrasonic vibration suppressor, the present invention comprises: a frequency generator for generating a frequency; A driving unit driving a frequency generated by the frequency generating unit; A switching power amplifier configured to amplify power by switching a frequency driven by the driver; An impedance matching unit for impedance matching the output of the switching power amplifier; An ultrasonic vibrator that receives the output matched by the impedance matching unit and converts an electrical signal into ultrasonic waves to generate ultrasonic waves; A phase detection and alarm unit which detects a phase by receiving the ultrasonic wave generated by the ultrasonic vibrator and generates an alarm when an abnormality occurs; The phase detection and alarm unit receives the signal of the ultrasonic vibrator and controls the driving unit according to the resonance of the ultrasonic wave so as to configure the intermittent control unit to remove resonance noise by periodically turning on / off the ultrasonic wave for a predetermined time. It is possible to remove the resonance noise inherent in the vibration suppressor by controlling the resonance formation time of the ultrasonic waves in the ultrasonic generator circuit without changing.

Description

Apparatus and method for elimination of resonance noise in supersonic scrubber}

The present invention relates to a resonant noise removing device and a method of the ultrasonic vibration suppressor, in particular, suitable for removing the resonance noise inherent in the vibration suppressor by controlling the resonance formation time of the ultrasonic wave in the ultrasonic generator circuit without changing the mechanical structure of the ultrasonic vibrator. The present invention relates to an apparatus for eliminating resonance noise of an ultrasonic vibration suppressor and a method thereof.

In general, ultrasonic waves are sound waves with a frequency of 20,000 or more per second, which are inaudible sounds.

Ultrasonic vibration suppression refers to removing fine particles such as dust attached to an object using ultrasonic waves. In addition, washing the object by using the sound vibration with the strong energy of the ultrasonic wave is called ultrasonic cleaning. Such ultrasonic cleaners and cleaners are used for cleaning medical instruments in hospitals and dental clinic, lens and optical component cleaning, school laboratory laboratory cleaning, jewelry, precious metal cleaning, laboratory research equipment cleaning, precision electrical and electronic component cleaning.

1 is a block diagram of a conventional ultrasonic vibration damper.

As shown therein, a frequency generator 11 for generating a frequency; A driver 12 driving the frequency generated by the frequency generator 11; A switching power amplifier 13 for switching and amplifying the frequency driven by the driver 12; An impedance matching unit 14 for impedance matching the output of the switching power amplifier 13; It is composed of an ultrasonic vibrator 15 for receiving the output matched by the impedance matching unit 14 converts an electrical signal into ultrasonic waves to generate ultrasonic waves.

Thus, the frequency generated by the frequency generator 11 is amplified and is output as ultrasonic waves through the ultrasonic vibrator 15.

In addition, since the noise of the inherent resonance appearing in the object in the ultrasonic vibration damper is very loud, problems such as deafness occur in the industrial field. In other words, the natural resonance frequency generated by the ultrasonic wave is a great harm to the working environment, so it is very important to eliminate such noise.

Thus, in the related art, vibration damping for removing noise generated in an ultrasonic vibration damper or a washing machine is used as follows.

2 is a cross-sectional view of a conventional ultrasonic vibration suppression apparatus, the contents of Japanese Patent Application Laid-open No. Hei 5-57260 filed on August 28, 1991.

Thus, the front end of the ultrasonic vibrating phone 2 is bonded to the glass bulb 3 side to forcibly vibrate the glass bulb 3, and the dust attached to the glass bulb 3 is separated from the inner surface of the glass bulb 3. In the position where the glass bulb 3 is in contact with the front end of the horn 2, the vibration transmitting material 1 made of a metal piece having a low hardness of glass is mounted.

In the case of Japanese Patent Laid-Open No. 5-57260, a method of eliminating the noise of the ultrasonic cleaner is proposed. Therefore, the vibration transmitting material (1) having a different proximity wave so as not to touch anything directly in front of it to eliminate the noise of the ultrasonic cleaner.

However, according to the prior art, there is a problem in that the damping rate is lowered because a material for transmitting vibration such as a synthetic resin is mediated between the ultrasonic generator and the glass bulb.

In addition, in the case of the vibration suppression method in the cathode ray tube bulb according to Japanese Patent Application Laid-open No. Hei 8-17349, or in the case of the vibration suppression apparatus for the cathode ray tube bulb of Korea Publication No. 20-1993-24348 or Korea Publication No. 90-14975, all of the prior art uses a buffer material. I'm using technology.

As such, in the related art, noise is removed by using a method such as adding a noise transmitting interference material to the ultrasonic vibrating body.

However, when the cushioning material is put as in the prior art, there is a problem in that the damping rate is lowered. Because the ultrasonic material is better to transmit the hard material, when the soft material is absorbed well and the noise disappears, but the cushioning material is composed of a material having a certain strength, there was a certain limit to improve the damping rate.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, an object of the present invention is to control the resonance formation time of the ultrasonic wave in the ultrasonic generator circuit without changing the structure of the ultrasonic vibrator to reduce the resonance noise inherent in the vibration suppressor. The present invention provides a resonant noise removing device and a method of removing an ultrasonic vibration suppressor.

1 is a block diagram of a conventional ultrasonic vibration damper,

2 is a cross-sectional view of a conventional ultrasonic vibration suppression apparatus,

3 is a block diagram of an apparatus for removing resonance noise of an ultrasonic vibration suppressor according to the present invention;

4 is a detailed circuit diagram of a frequency generator, a driver, and an intermittent controller in FIG. 3;

5 is a detailed circuit diagram of the switching power amplifier in FIG. 3, FIG. 6 is a circuit for implementing the switching amplifier, (a) is a push-pull method, (b) is a full bridge method, (c) is a half bridge method, and FIG. As a circuit diagram of the interruption control unit 37, when (a) uses a method of changing the ultrasonic wave generation frequency for supplying intermittent or periodic energy of the ultrasonic wave, (b) indicates a method of interrupting the drive signal of the switching amplifier circuit. In the case of use, (c) is a circuit diagram of the interruption control unit 37 when a method of interrupting the DC voltage of the switching amplifier circuit is used.

Explanation of symbols on the main parts of the drawings

11: frequency generator 12: driver

13 switching power amplifier 14 impedance matching unit

15: ultrasonic vibrator 16: phase detection and alarm unit

21: intermittent control unit

Hereinafter, with reference to the accompanying drawings, an embodiment according to the present invention, the apparatus for resonant noise removing the ultrasonic vibration damper and the method thereof is as follows.

3 is a block diagram of an apparatus for removing resonance noise of an ultrasonic vibration suppressor according to the present invention.

As shown therein, a frequency generator 31 for generating a frequency; A driver 32 driving the frequency generated by the frequency generator 31; A switching power amplifier 33 for switching and amplifying the frequency driven by the driver 32; An impedance matching unit 34 for impedance matching the output of the switching power amplifier 33; An ultrasonic vibrator 35 which receives the output matched by the impedance matching unit 34 and converts an electrical signal into ultrasonic waves to generate ultrasonic waves; A phase detection and alarm unit 36 which detects a phase by receiving the ultrasonic wave generated by the ultrasonic vibrator 35 and generates an alarm when an abnormality occurs; The intermittent control unit 37 receives the signal of the ultrasonic vibrator from the phase detection and alarm unit 36 and controls the driving unit 32 according to the resonance of the ultrasonic wave to periodically turn on / off the ultrasonic wave for a predetermined time to remove resonance noise. It is configured to include.

In the above, the switching power amplifier 33 prevents heat generation and prevents destruction of the device by preventing simultaneous conduction of the switching device by providing a down period of less than a predetermined ratio of the entire period during the on / off switching of the control controller 37. In this case, the constant ratio is to prevent simultaneous conduction of the up and down switches of the switching power amplifier 33 and refers to a ratio of 30 to 49% due to the characteristics of the ultrasonic circuit.

The resonance noise removing apparatus and the method of the ultrasonic vibration suppressor according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the present invention uses a method of removing resonance noise inherent in the vibration suppressor by using a method of controlling the resonance formation time of the ultrasonic waves in the ultrasonic generator circuit without changing the structure of the vibrator.

Ultrasound refers to sound waves with a frequency of 20KHz or more, and is used to make ultrasonic cleaners, welding machines, and medical diagnostic devices using various physicochemical actions.

3 is a block diagram of an apparatus for removing resonance noise of an ultrasonic vibration suppressor according to the present invention.

Thus, the ultrasonic generator is usually composed of oscillators 31 to 34 for generating high frequency electric signals and ultrasonic vibrators 35 for converting electrical signals to ultrasonic waves.

Here, the oscillator serves to supply the high frequency electric signal to the ultrasonic vibrator 35, and the ultrasonic vibrator 35 performs the function of an energy converter for converting the high frequency electric signal supplied from the oscillator into the corresponding ultrasonic vibration. Done.

FIG. 4 is a detailed circuit diagram of the frequency generator 31, the driver 32, and the intermittent control unit 37 in FIG. 3, and FIG. 5 is a detailed circuit diagram of the switching power amplifier 33 in FIG. 3.

The frequency oscillation circuit is a part that generates the resonant frequency of the ultrasonic waves. The generated signal is input to the driver 32 driving the switching power amplifier 33.

6 is a representative implementation method of the switching amplifier 33 composed of a switching element, (a) is a push-pull method, (b) is a full bridge method, (c) is a half-bridge method. The switching power amplifier 33 supplies a high frequency power to the load side with high efficiency by switching the DC voltage at high speed. In general, transistors, FETs, and TRIACs, which are semiconductor switching elements constituting the amplification circuit, have a reverse recovery time depending on device characteristics during on / off switching, causing heat generation and device destruction.

Therefore, the switching power amplifier 33 here provides a down period of less than 10% of all cycles during the on / off switching to prevent the simultaneous conduction of the switching elements, thereby suppressing heat generation and preventing the destruction of the elements, thereby improving the reliability of the circuit. To increase it.

This pause can be appropriately varied depending on frequency, switching elements, etc., and can be handled simply using PWMICs developed for switched-mode power supplies.

The electrical signal from the switching power amplifier 33 is not transmitted directly to the vibrator, so that an invalid component of the impedance of the vibrator is canceled through the impedance matching unit 34. Then, the maximum power transfer is achieved by canceling the impedance reactive component.

When the ultrasonic vibrator 15 is a piezoelectric vibrator, the impedance matching part 34 has L (inductance) because the impedance is composed of C (capacitance) and a pure resistance component.

The current detection signal of the ultrasonic vibrator 35 is obtained by CT or a resistor connected to the vibrator. The detected current is input to an LED indicator or a voltmeter for displaying the output state after shaping the waveform through a simple filter circuit.

The signal is input to the phase detection and alarm unit 36 configured as a comparator, and when the signal is higher than the reference signal of the set comparator, the overcurrent alarm and the power-off operation are performed.

In this configuration, the intermittent control unit 37 is installed to turn on / off the ultrasonic wave as short as a few seconds to several tenths of a second to eliminate resonance noise. For example, about 0.5 to 1 second after the ultrasonic wave is applied to a TV device. If noise occurs, the reason is that the energy applied by the ultrasonic waves accumulates inside to cause resonance for 0.5 to 1 second. Therefore, if the ultrasonic wave is operated for about 0.5 seconds and the operation for stopping the 0.5 second ultrasonic wave is repeated, resonance noise does not occur. The intermittent supply method of the ultrasonic waves does not have much difference in terms of the ultrasonic particle removal effect compared to the continuous ultrasonic operation method.

The reason for the resonance noise in the conventional ultrasonic vibration suppression circuit is that the resonance is formed by supplying ultrasonic energy corresponding to the natural resonance frequency of the object for a predetermined time. Therefore, by artificially adjusting the time that the ultrasonic wave is supplied, it is possible to prevent the inherent resonance is formed. In addition, it is possible to use the same noise canceling method in a general ultrasonic cleaner. By controlling the resonance formation time of the ultrasonic wave in the ultrasonic wave generation circuit without changing the to eliminate the resonance noise inherent in the vibration damper.

Thus, the intermittent control unit 37 may remove the resonance noise by giving a dead time by intermittently operating the signal before the resonance starts.

7 is a circuit diagram of the intermittent control unit 37. The intermittent control unit 37 is a method of changing the ultrasonic generation frequency (Fig. 7 (a)) and the drive signal of the switching amplification circuit for the intermittent or periodic energy supply of the ultrasound (Fig. 7 (b)) And the DC voltage of the switching amplifier circuit (FIG. 7 (c)) is implemented.

First, if the ultrasonic generation frequency is changed, the intermittent control unit 37 is composed of a triangular wave generating circuit generating a frequency of 0.5 Hz to 50 Hz, and the output is connected to the frequency generating circuit so that the frequency is continuously variable. By amplifying the signal and driving the ultrasonic vibrator, the ultrasonic wave emits energy periodically or intermittently as described above. This occurs because the ultrasonic vibrator emits energy only at a specific frequency. Second, the method of controlling the drive signal of the switching amplifier circuit is to interrupt the signal of the driver 32 which is the driver circuit of the switching amplifier 33. Ultrasonic energy is intermittently generated by intermittently operating the high frequency output of the switching amplifier 33 by connecting an intermittent control unit 37, which is an intermittent circuit, to the driver 32 circuit. At this time, the circuit to turn the circuit on and off is a common on / off circuit implemented using IC, relay, transistor, FET, resistor. The interruption control unit 37 in the block diagram of FIG. 3 corresponds to this. Finally, the circuits according to the push-pull, full-bridge, and half-bridge methods for implementing the switching amplifier 33 include high-frequency signals and DC. The voltage is input (FIG. 6), which interrupts the DC voltage of the switching amplifier circuit, which is a method of controlling the DC voltage intermittently.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the apparatus for resonant noise removing and the method of the ultrasonic vibration suppressor according to the present invention can remove the resonance noise inherent in the vibration suppressor by controlling the resonance formation time of the ultrasonic wave in the ultrasonic generator circuit without changing the structure of the ultrasonic vibrator. It is effective.

Claims (3)

When the frequency generated by the frequency generator 11 is converted into an ultrasonic wave by the ultrasonic vibrator 15 through the driving unit 12, the switching power amplifier 13, and the impedance matching unit 14, resonance noise is removed. Resonant noise elimination of the ultrasonic vibration suppressor characterized in that the ultrasonic wave is periodically turned on / off for 0.02 seconds to 2 seconds by varying the frequency of ultrasonic generation, interfering the drive signal of the switching amplifier circuit, or intermittently controlling the DC voltage of the switching amplifier circuit. Way. A frequency generator 11 for generating a frequency; A driver 12 driving the frequency generated by the frequency generator; A switching power amplifier 13 for switching and amplifying the frequency driven by the driver 12; An impedance matching unit 14 for impedance matching the output of the switching power amplifier 13; An ultrasonic vibrator 15 which receives the output matched by the impedance matching unit 14 and converts an electrical signal into ultrasonic waves to generate ultrasonic waves; A phase detection and alarm unit 16 which detects a phase by receiving the ultrasonic wave generated by the ultrasonic vibrator and generates an alarm when an abnormality occurs; The phase detection and alarm unit 16 receives the signal of the ultrasonic vibrator 15 and controls the driving unit 12 according to the resonance of the ultrasonic waves to periodically turn on / off the ultrasonic waves for 0.02 seconds to 2 seconds to generate resonance noise. Resonant noise removing device of the ultrasonic vibration suppressor, characterized in that it comprises a control unit 21 for removing. The method of claim 2, wherein the switching power amplifier 13, Resonance of the ultrasonic vibration suppressor, characterized in that the interruption control unit 21 prevents the simultaneous conduction of the switching element by preventing 30-49% of the entire period during the on / off switching, thereby preventing the conduction of the switching element. Noise canceller.