CN101170281B - Ultrasonic rod electric control system - Google Patents

Abstract

The invention relates to an ultrasonic rod electric control system, which comprises: a high-frequency inverter, a high-frequency transformer and at least one ultrasonic energy converter. The high-frequency inverter, high-frequency transformer and the ultrasonic energy converter are connected with each other in sequence; moreover, the ultrasonic rod electric control system is composed of a micro-processor and a frequency generator; wherein, the micro-processor controls the frequency generator to create control signals, so as to control the working status of the ultrasonic energy converter. Themicro-processor controls the frequency generator to produce control signals, in order to control the working status of the ultrasonic energy converter; the output power of the ultrasonic energy converter can be fulfilled through adjusting duty cycles of the PMW signals; the micro-processor can regulate the frequency generator through the current detection signals, so that the output current of theultrasonic energy converter can be in the maximum value; thus, the invention can realize that the ultrasonic energy converter can always output rather high working power.

Description

Ultrasonic rod electric control system

【Technical field】

The invention relates to an electric control system for an ultrasonic rod, in particular to an electric control system for an ultrasonic rod that can provide relatively large output power.

【Background technique】

Ultrasonic rods are mainly used in cleaning, sonochemistry, sewage treatment, crude oil treatment, Chinese herb extraction, food and biological engineering, etc. The existing cleaning equipment is composed of multiple ultrasonic transducers with low power. Due to the special structure of the ultrasonic rod Features, adopting the control mode of the prior art ultrasonic cleaning equipment cannot make the ultrasonic rod work effectively. The electrical control technology of the ultrasonic rod must be comprehensively applied with electrical control technologies such as frequency tracking, automatic power compensation, and frequency sweep, so that the equipment can work normally when parameters such as temperature and load change. At present, cleaning equipment generally adopts the method of tracking voltage and current phase for frequency tracking, or the method of frequency sweeping alone, but frequency tracking and frequency sweeping cannot be used at the same time. The traditional control mode of ultrasonic cleaning equipment is used to control the ultrasonic rod, and the output power of the ultrasonic rod is small. , low efficiency and poor cleaning effect.

【Content of invention】

In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides an electronic control system for an ultrasonic rod that can provide relatively large output power.

The technical solution adopted by the present invention to solve the technical problem is to provide an electric control system for an ultrasonic rod, which includes: a high-frequency inverter, a high-frequency transformer, at least one ultrasonic transducer, and the high-frequency inverter , a high-frequency transformer and an ultrasonic transducer are connected in sequence, and it is characterized in that: the electric control system of the ultrasonic rod further includes a microprocessor and a frequency generator, and the microprocessor controls the frequency generator to generate a control signal to control the ultrasonic In the working state of the transducer, the frequency adjustment of the frequency generator generates a PWM signal through the microprocessor, and then through low-pass filtering, the voltage follows to obtain a DC voltage signal to control the frequency of the frequency generator, and the power adjustment is through the microprocessor The PWM signal is generated, and then through low-pass filtering, the voltage is followed to obtain a DC voltage signal to control the duty cycle of the frequency generator outputting the PWM signal.

The solution of the present invention to solve the further technical problem is: the frequency generator generates a PMW control signal, and the PMW control signal is applied to the ultrasonic transducer through a PMW driver.

The solution of the present invention to solve the further technical problem is: the output power of the ultrasonic transducer is realized by adjusting the duty cycle of the PMW signal.

The solution of the present invention to solve the further technical problem is: the microprocessor adjusts the frequency generator through the current detection signal, so that the output current of the ultrasonic transducer is at the maximum value.

The solution of the present invention to solve the further technical problem is: the microprocessor outputs a frequency sweep signal at a certain frequency, and the frequency sweep signal outputs a low-frequency pulse signal through the microprocessor, and after voltage division, the integrating circuit obtains a slowly rising voltage , added to the frequency generator.

The solution of the present invention to solve the further technical problem is: the ultrasonic rod electric control system further includes a thyristor voltage regulating device, the output power of the ultrasonic transducer is realized by adjusting the thyristor voltage regulation, the microprocessor detects The voltage zero-crossing signal of the ultrasonic transducer controls the firing angle of the bidirectional thyristor through isolation and control of the optical thyristor MOC30xx to realize voltage regulation and power regulation.

The solution of the present invention to solve the further technical problem is: the ultrasonic rod electric control system further includes a power grid filter, a rectification device and a filter device, and the power grid filter, rectification device and filter device rectify and filter the voltage signal of the power grid and add to the high frequency inverter.

The solution of the present invention to solve the further technical problem is: output power, operating frequency, timing control information indication, display through light bar and digital tube, or through liquid crystal display.

Compared with the prior art, the beneficial effect of the present invention is: the microprocessor controls the frequency generator to generate a PMW control signal to control the working state of the ultrasonic transducer, and the output power of the ultrasonic transducer is adjusted by adjusting the PWM The duty cycle of the signal is realized, the microprocessor adjusts the frequency generator through the current detection signal, so that the output current of the ultrasonic transducer is at the maximum value, so that the ultrasonic transducer can always output a large working power .

【Description of drawings】

Fig. 1 is a schematic block diagram of the system circuit of the ultrasonic rod electric control system of the present invention.

Fig. 2 is a circuit diagram of the electric control system of the ultrasonic rod of the present invention.

【Detailed ways】

The electronic control system of the ultrasonic rod of the present invention will be further described below in conjunction with the drawings and embodiments.

Please refer to Fig. 1 and Fig. 2 together, the ultrasonic rod electric control system 1 includes a grid filter 11, a thyristor voltage regulating device (not marked), a rectifying device 12, a filtering device 13, a high frequency inverter Transformer 14, a high-frequency transformer 15, at least one ultrasonic transducer 16, a microprocessor 20, a frequency power adjustment sweep circuit 23, a frequency generator 21, a current detection device 17 and a PMW driver 22. The grid filter 11 , rectifying device 12 , filtering device 13 , high frequency inverter 14 , high frequency transformer 15 and ultrasonic transducer 16 are connected in sequence. The microprocessor 20 generates a control signal and controls the working state of the ultrasonic transducer 16 through the frequency power adjustment sweep circuit 23 , the frequency generator 21 and the PMW driver 22 . The ultrasonic rod electric control system 1 further includes a temperature detection device and a button display device, the temperature detection device is connected with the high frequency inverter 14 and the microprocessor 20 , and the button display device is connected with the microprocessor 20 .

The 220V voltage from the grid is filtered by the grid filter 11, rectifier 12, filter 13, full-bridge rectified, and filtered to obtain a DC voltage of about 300V, which is added to the half-bridge high-frequency inverter On 14, the power switch tube is turned on and off in turn under the trigger of a pair of square wave pulses with a mutual difference of 180 degrees, and converts the DC voltage into an alternating high-frequency square wave voltage. After being transformed by the high-frequency transformer 15, the output is added to the In the resonant circuit between the ultrasonic transducer 16 and the matching inductance, the size of the matching inductance is selected according to the resonance frequency and impedance of the ultrasonic transducer 16 .

The microprocessor 20 controls the frequency generator 21 to generate a PWM signal consistent with the resonance frequency of the ultrasonic transducer to control the power switch tube through driving, and the PWM driver 22 passes the PWM signal through the high frequency inverter 14 and A high-frequency transformer 15 is added to the ultrasonic transducer 16 to drive and control the ultrasonic transducer 16 .

At the same time, the microprocessor 20 outputs a frequency sweep signal at a certain frequency, which is applied to the frequency generator 21, so that the frequency generator 21 generates a frequency sweep signal. At the same time, the microprocessor 20 detects the output current signal and fine-tunes the frequency of the frequency generator 21 according to the current signal of the current detection device 17, so that the output current is always at the maximum value, that is, the ultrasonic transducer 16 is always in resonance state. The adjustment of the ultrasonic output power is realized by changing the duty cycle of the PWM signal. The output power can be set by pressing the button, the timing shutdown time setting, and the oscillation reference frequency setting can be set. The power is visually displayed through the light bar, and the frequency and timing time are displayed through the digital tube.

For frequency adjustment, a microprocessor generates a PWM signal, and then obtains a DC voltage signal through a low-pass filter voltage follower to control the frequency generator 21 .

For power regulation, the microprocessor 20 generates a PWM signal, and then obtains a DC voltage signal through a low-pass filter voltage follower to control the duty cycle of the PWM signal output by the frequency generator 21 .

The frequency sweep signal outputs a low-frequency pulse signal through the microprocessor 20, and after voltage division, the integrating circuit obtains a slowly rising voltage, which is supplied to the frequency generator 21.

The current detection signal is obtained by converting the current detected by the current transformer into current and voltage, and then sampling by the microprocessor 20 .

The microprocessor controls the frequency generator to generate a PMW control signal to control the working state of the ultrasonic transducer. The output power of the ultrasonic transducer is realized by adjusting the duty cycle of the PWM signal. The microprocessor passes the current The detection signal is used to adjust the frequency generator, so that the output current of the ultrasonic transducer is at the maximum value, so that the ultrasonic transducer can always output a larger working power.

The output power adjustment of the ultrasonic transducer can also be realized through SCR voltage regulation. The SCR voltage regulation principle is that the microprocessor detects the voltage zero-crossing signal, and controls the triggering of the triac through the isolation control of the photo-controlled silicon controlled rectifier MOC30xx angle to realize voltage regulation and power regulation.

The output power, operating frequency, timing control and other information indications of the ultrasonic wand electronic control system 1 are displayed through light bars and digital tubes, and this part can also be replaced by liquid crystal displays.

The over-temperature detection and protection of the driving power tube is to paste a thermistor on the power tube, and the microprocessor detects the temperature of the power tube in real time for monitoring.

The PWM driving of the control power tube is realized through a high-speed power driver IC4, and the power tube can be connected in parallel by 1 to 4 through the isolation of the pulse transformer.

Claims (7)

1. ultrasonic bar electric controlled system, it comprises: a high-frequency inverter, one high frequency transformer, at least one ultrasonic transducer, this high-frequency inverter, high frequency transformer and ultrasonic transducer connect successively, it is characterized in that: this ultrasonic bar electric controlled system further comprises a microprocessor and a frequency generator, this microprocessor is controlled this frequency generator and is produced the operating state that control signal is controlled this ultrasonic transducer, the frequency adjustment of this frequency generator produces pwm signal by microprocessor, pass through low-pass filtering again, voltage follow obtains d. c. voltage signal, come the frequency of control frequency generator, power adjustments produces pwm signal by this microprocessor, pass through low-pass filtering again, voltage follow obtains d. c. voltage signal, comes the duty ratio of control frequency generator output pwm signal.

2. ultrasonic bar electric controlled system according to claim 1 is characterized in that: what this frequency generator produced is the PMW control signal, and this PMW control signal is added on this ultrasonic transducer by a PMW driver.

3. ultrasonic bar electric controlled system according to claim 2 is characterized in that: the power output of this ultrasonic transducer recently realizes by the duty of adjusting this PMW signal.

4. ultrasonic bar electric controlled system according to claim 3 is characterized in that: this microprocessor is regulated this frequency generator by current detection signal, makes the output current of this ultrasonic transducer be in maximum.

5. ultrasonic bar electric controlled system according to claim 3, it is characterized in that: this ultrasonic bar electric controlled system further comprises a scr voltage regula-tor unit, the power output of this ultrasonic transducer realizes by the mode of adjusting silicon-controlled voltage regulation, this microprocessor detects the voltage zero-crossing signal of this ultrasonic transducer, by light activated power thyristor MOC30xx isolated controlling The Trigger of Bidirectional Triode Thyristor angle, realize the pressure regulation adjusting power.

6. ultrasonic bar electric controlled system according to claim 1, it is characterized in that: this ultrasonic bar electric controlled system further comprises a line filter, a rectifying device and a filter, is added to this high-frequency inverter behind this line filter, rectifying device and the filter voltage signal rectifying and wave-filtering with electrical network.

7. ultrasonic bar electric controlled system according to claim 1 is characterized in that: power output, operating frequency, the indication of time-controlled information, show by light beam bar and charactron, or by liquid crystal display.

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