CN2437418Y

CN2437418Y - Ultrasonic generator

Info

Publication number: CN2437418Y
Application number: CN 00228438
Authority: CN
Inventors: 左自强
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-06-09
Filing date: 2000-06-09
Publication date: 2001-07-04
Anticipated expiration: 2010-06-09

Abstract

The utility model relates to an ultrasonic generator. The existing similar equipment is mainly composed of a self-excited oscillation circuit usually, and has the defects that output power is limited, etc. The utility model is composed of a DC power-supply circuit, a separately excited oscillation circuit, an oscillation-power amplification circuit, and an ultrasonic transduction circuit, wherein, inductance coils which enable the ultrasonic transduction circuit to generate resonance or near the resonance are connected in the ultrasonic transduction circuit in series. Thereby, the utilization efficiency and the output power of an ultrasonic transducer can be increased, the voltage of a transmission conducting wire connected with a circuit of the ultrasonic transducer can also be reduced, and the use safety can be increased.

Description

Supersonic generator

The utility model belongs to a kind of supersonic generator.

Supersonic generator can be used for cleaning, bathing, multiple occasion such as the atomization of liquid, existing supersonic generator normally adopts the LC self-maintained circuit, in the circuit of this structure, there are the positive feedback electrical connection in ultrasonic transducer and self-maintained circuit, so ultrasonic transducer is the transducer part that the signal of telecommunication is converted to acoustic signals, be again directly influence the self-maintained circuit frequency of oscillation capacitive load, part as load, if transducer in parallel is too much, total capacitance after the transducer parallel connection then increases, influence the frequency of oscillating circuit, thereby limited the quantity in parallel of transducer, influenced the power output of an oscillating circuit, if a plurality of oscillating circuits are connected in parallel in order to improve power output, again must be synchronous with synchronizing signal, make circuit become complicated, cost improves, easy break-down, and the resonant frequency of self-maintained circuit can not regulate arbitrarily, otherwise can off resonance or power output is descended greatly.

The utility model aims to provide a kind of efficient height, and power output is big, supersonic generator simple in structure.

The technical scheme that realizes above-mentioned purpose is: the utility model comprises dc voltage circuit, oscillating circuit, the hunting power amplifying circuit, the ultrasonic wave transducer circuit that links with the hunting power amplifying circuit, be connected to ultrasonic transducer in the ultrasonic wave transducer circuit, it is characterized in that: described oscillating circuit is his excited oscillation circuit that does not have positive feedback relation with the ultrasonic wave transducer circuit, is in series with in the described ultrasonic wave transducer circuit to make the ultrasonic wave transducer circuit realize series resonance or near the inductance coil of series resonance.

What this supersonic generator adopted is the separated exciting oscillating circuit that does not have feedback relationship with the ultrasonic wave transducer circuit, so what ultrasonic transducers in parallel are to the not influence of frequency of his excited oscillation circuit, thereby can reduce restriction to the transducer power excursion, and the inductance coil of connecting in the ultrasonic transducer circuit makes transducer capacitive load loop realize resonance or during near resonant condition, total impedance greatly reduces, be pure resistance or near the pure resistance state, electric current improves, can improve the utilization ratio and the power output of ultrasonic transducer again, simultaneously when this inductance coil and ultrasonic transducer are installed together, also can reduce the voltage of connected transfer wire, improved the security of using, the utility model also has advantage of simple structure.

Description of drawings:

Fig. 1, the utility model embodiment circuit diagram

A-adjustable dc voltage circuit B-square wave signal generator C-square wave power amplification circuit

D-ultrasonic wave transducer circuit

Fig. 2, the utility model frame principle figure

Fig. 3, the utility model embodiment ultrasonic wave transducer circuit input end P, Q two point voltage oscillograms

Fig. 4, the utility model embodiment ultrasonic transducer R, 2 current waveform figures of S

The embodiment explanation:

His excited oscillation circuit of this example is by square wave signal generator B, square wave power amplification circuit C forms, square wave signal generator input 2 is connected to the adjustable resistor VR3 of adjustable perfect square ripple dutycycle, square wave signal generator B is made up of integrated package SG1525, and the square-wave signal power amplification circuit is made of the semibridge system on-off circuit that triode Q4～Q11 and FET Q12, Q13 form.

This example is connected to the adjustable resistance circuit that can change the square-wave generator frequency by timing electronic switch SW3 control between square wave signal generator input 6 and ground, this adjustable resistance circuit is by R39, the parallel circuit that R3939 forms, described timing electronic switch SW3 is connected in the R3939 branch road, when electronic switch turn-offs, resistance R 39 is connected between square wave signal generator input 6 and the ground, when electronic switch time closing, be connected between input and the ground by R39 and R3939 parallel resistor, the resistance difference, the frequency of square wave signal generator signal is just different, like this under the effect of electric timing switch, square-wave generator can produce two kinds of different frequencies automatically periodically, when this device was used for the human body bathing, two kinds of different frequencies can improve the comfort of human body, when being used for the metal cleaning, can improve cleaning efficiency, Automatic Electronic Switch is inversion frequency automatically, and because be noncontacting switch, so long service life.This example is provided with a duplex switch SW 2A and a SW2B, the SW2A of one of them is connected in the resistance loop between SG1525 the 12nd pin and the ground, be connected to C27 in parallel, R40 between SG1512 the 8th pin and the ground, when SW2A disconnects, can make the square width of output just can reach predetermined value, prevent the Q12 and the Q13 pipe of double flux effects damage back level power amplification circuit through certain hour.

Square wave signal generator output 11,14 connects transformer TR9 primary coil, and the TR9 secondary coil connects square wave power amplification circuit input, and the square-wave signal that amplifies through this circuit is input to ultrasonic wave transducer circuit D by transformer TR8.

The ultrasonic wave transducer circuit is composed in series by piezoelectric ceramic transducer TRANSDUCER and inductance coil L3, is connected on TR8 level of transformer.The induction reactance of inductance coil L3 is for making this ultrasonic transducer circuit and produce resonance or near the induction reactance value of resonance, induction reactance equals capacitive reactance during according to series resonance, the selected L3 of this example approximates 1/4 π 2F2CX, wherein F is the square wave frequency by separate excitation produced, CX is an electrostatic capacitance amount of shaking, thereby making the ultrasonic wave transducer circuit is resonance or near resonant condition, make transducer draw bigger electric current from power supply, improve the utilization rate and the power output of transducer, make the oscillating circuit head that can a plurality of transducers in parallel shakes, can reduce the voltage of the transfer wire that links to each other with converter circuitry simultaneously.See Fig. 3, ultrasonic wave transducer circuit input end P, Q both end voltage waveform are square wave, under converter circuitry is in state near resonance, make square-wave signal that a suitable dutycycle be arranged by adjusting VR3 again, just can make the approaching sine wave shown in Figure 4 of the electric current that flows through ultrasonic transducer.His excited oscillation circuit of this example adopts square wave signal generator, is more much higher than producing a high-power sinusoidal wave efficient because produce a high-power square wave.

Be provided with an independent direct current regulating circuit with direct current voltage reulation, voltage stabilizing function in this routine dc voltage circuit, link, in order to regulate the power output of square wave power amplification circuit with square wave power amplification circuit output stage.This dc voltage regulator circuit adopts the pressure regulation of bidirectional triode thyristor AC voltage adjusting side, be provided with the YR1 adjustable resistor at UA741 integrated package input, adjust this resistance and can make the continuously adjustable reference voltage of UA741 output 0～60mv, between UA741 input and output, be connected to integrating capacitor C6, when the SW2B among the aforementioned ganged switch SW2 is closed, reference voltage drops to 0 immediately, when SW2B disconnects, the UA741 output slowly is raised to predetermined reference voltage value again, thereby the DC voltage that can ensure the rectifier bridge D7 output of dc source final stage slowly charges to C19 through L2, damages bidirectional triode thyristor TRAIC and rectifier bridge D7 in order to avoid form excessive moment impact electric current.Adjust VR1, set different reference voltages, can set the upper limit of final stage DC voltage, being input to CA3140 through VR2 again after this reference voltage is set compares with the negative-feedback voltage of getting from dc voltage output circuit R33, through the anti-phase continuously adjustable control voltage of the exportable 0～6V of people of putting of Q1, the pulse width of the 50HZ synchronization pulse that produces with this Control of Voltage NE556, control voltage is adjustable continuously, the synchronization pulse width is promptly adjustable continuously, the synchronization pulse that NE556 produces is isolated the integrated package coupling by U4 light, through triode Q2, Q3 amplifies, be input to the control utmost point of bidirectional triode thyristor TRA1C again through pulse transformer TR4, adjust this pulse width, can change the angle of flow of bidirectional triode thyristor, thereby change it and exchange Mean Input Power, again through rectifier bridge D7 rectification, L2, C19 filtering, for square wave power amplification circuit output stage provides one to stablize, adjustable DC voltage, this DC voltage height, the power output of ultrasonic transducer is big, and direct current forces down, power output is just little, thereby satisfies the needs of different occasions.

This example does not have to adopt the form of adjusting duty cycle square wave commonly used usually to regulate the transducer power output, be because this method adjustable range is very little, when dutycycle is very little, the waveform of ultrasonic transducer circuit departs from sine waveform, the transducer noise is increased, and dutycycle is when very little, and the peak point current of the Q12 of power amplification circuit output stage, Q13 two field effect transistor switch pipes is also very big, fragile these two switching tubes.Adopt this routine independent direct current voltage controller power source then can overcome above-mentioned deficiency to the structure of square wave power amplification circuit output stage power supply.

Claims

1, supersonic generator, comprise dc voltage circuit, oscillating circuit, the hunting power amplifying circuit, the ultrasonic wave transducer circuit that links with the hunting power amplifying circuit, be connected to ultrasonic transducer in the ultrasonic wave transducer circuit, it is characterized in that: described oscillating circuit is his excited oscillation circuit, is in series with in the described ultrasonic wave transducer circuit to make the ultrasonic wave transducer circuit realize series resonance or near the inductance coil of series resonance.

2, supersonic generator according to claim 1, it is characterized in that: described his excited oscillation circuit is by square wave signal generator (B), square wave power amplification circuit (C) is formed, and the square wave signal generator input is connected to the adjustable resistance circuit that can change the square-wave generator frequency by timing electronic switch (SW3) control.

3, supersonic generator according to claim 1 and 2 is characterized in that: be provided with an independent direct current regulating circuit with direct current voltage reulation, voltage stabilizing function in the described dc voltage circuit, link with square wave power amplification circuit output stage.