SU718179A1 - Method of automatic tuning of frequency in ultrasonic apparatus - Google Patents

Description

From the moment the installation is switched on, the frequency of the source / irrespective of excitation increases spontaneously, at this start the value of this frequency is lower than the resonant frequency of the ultrasonic transducer 5 6. At this time, the switch 2 is closed and 5 in the ignored mode: (which, to the input of the LM1 pulsation formation circuit 4, the control will send a signal from the source U / through the public key 2.

. The input of the indicator 8 phase coincidence. ,, Two signals are being received, for example, “as shown in the drawing: the sypnal” of the output of the 5-power amplifier and the signal from the acoustic 15 of the sensor 7.

As Pastbt grows, the lag ,, .- / / independent-excitation changes. the phase difference of the indicated sipnalo. in “at the moment when it is equal to ilu, the signal from the output 20, the indicator 8 of the phase coincidence arrives simultaneously on. 2 .and 5, treason, their condition. VOsIvNiS self-excited, with which the input of the circuit 4 for the formation of 25 pulses of emission through the open KLyuch 3 passes the signal of positive feedback from the acoustic sensor and 7.

. Method (allows, for a time less than one period, the ultrasonic acoustic frequency 1, 30 is replaced ... in the control circuit of the generator, an independent signal (excitation to the acoustic feedback signal at the moment of ow: the phases drop, which guarantees ots) -t-. - .str. interruptions and disruptions in the work of the generator-35 tor: a.

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718179

Using the method made it possible to apply auto-tuning in; Ultrasonic devices installed on thyristors, and combine high 1 G1D current conversion and high power with precise tuning to the resonant frequency of the converter, which significantly increases the performance of similar devices designed for ultrasonic firmware, welding: , and, machining with the imposition of ultrasound, etc.

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Claims (2)

Invention Formula The composable adjustment of the frequency in ultrasound units, based on the formation of a feedback signal as a result of a comparison of the phases of the two, the signals when the frequency of the independent change (excitation, o.t.l and h and w and , With the aim of expanding the operating frequency band and eliminating static wavelength. And, before generating a feedback signal, the feedback is turned off and the frequency of the independent excitation monotonously changes until the phases of the two signals coincide, and then communication f. -. Sources of information taken into account in the examination: I. USSR Copyright Certificate 186779, cl. B 06 B 1/08, 1963. . 2. Japan patent i№ 2821/64, cl. 102 H2, (prototype).