SU1436284A1 - Induction heating installation - Google Patents

Description

(21) 4174952 / 24-07

(22) 26.II.86

(46) 11/07/88, Bull. № 41

(71) Ufa Aviation Institute named after Sergo Ordzhonikidze

(72) B.N.Maron, V.E. Del, E.I.Sn tkov, R.U.Gabzalilov, Yu.T.Arslanov, P.P.Pominov

and T.P.Yominova

(53) 621.365.52 (088.8) (56) Patent of CUJA No. 3717807, kl.321-27, 1973.

USSR author's certificate number 647815, cl. H 02 M 7/515, 1976.

USSR Author's Certificate No. 1121789, cl. H 05 B 6/06, 1984.

(54) INDUCTION HEATING INSTALLATION

 .one

(57) The invention relates to electrical engineering. The goal is to increase the reliability of the installation. The installation contains a device for controlling output parameters. If the power supplied by the frequency converter 6 to the load 7 is greater than the set value, then when comparing the voltages of the sensor 8 and the programmer 11, the corresponding signal is fed to the information input of the counter. After passing the clock pulses, the signal arrives at the RS flip-flop 12, the switching of which sets the frequency set by the programmer 1i. If the process mode does not change, then, after a comparison, the w formation does not change. 2 Il.

(L

00

a to

00 4

The invention relates to electrothermal and can be applied in induction heating installations in mechanical engineering and metallurgy.

The purpose of the invention is to increase the reliability of work.

Figure 1 shows the block diagram of the installation; figure 2 - timing diagrams.

 The installation contains a master oscillator (DG) 1, the outputs of which are connected through the counters 2-5 to the control input of converter 6 loaded on parallel circuit 7, sensor 8 of the output parameter of converter s, serial approximation register (DFD) 9, clock generator (GTI ), programmer P, K5 trigger 12, key 3, comparator 1A, differentiating chain 15.. The programmer 11 consists of a timer 1 6 and a source 17 of the reference voltage.

There is also a block 18 with switches. All the elements, except 6-8, constitute the device of the software program. The indexes of the signals in figure 2 indicate the element number.

The installation works as follows.

The frequency of operation of the converter 6 determines the division ratio of counters 2-5, which depends on the preset numbers n, n, Ujj-n, in counters 2-5. The presetting of the required number in the counters 2-4 is realized by supplying them to the information inputs D ,, s D ,,, Of the data from the outputs of the PCH1 9. In the counter 5, the preset number n is made manually by dialing the code on the switches of the block 18. The dialed number determines the control range, the rigidity of the control characteristics of the device as a whole. Writing to counters 2-5 is performed simultaneously by applying a positive pulse to the inputs from counters 2-5.

Simultaneously with the signal to record from the output of counter 5, the serial-to-converter 6 is removed.

The dependence of the frequency F of the converter 6 on the division factor N and the frequency F, ЗГ 1 is determined by the formula

V - -llL P - N

Fjr const.

n, n explained

moreover, N in the direct counting solution is N (15-n) BS (IS-ng) 16 + (15-nj). х1бЧ (15-п), where п,, П2, Пэ, п are preestablished numbers. A preset is made manually. The process of adjusting and increasing by the register of the successive approximation of the numbers n. Figure 2.

The programmer 11 includes, in the simplest case, a timer and a source 17 of the reference voltage corresponding to a given output parameter.

The timer, at certain intervals of time required by the process, includes controlling the frequency F, the control pulse U 17 on the short-circuit trigger 12. The inverted RS-r of the igger 12 is connected to the control input of the switch. With the RTI 10 through the key 13 on the counting C-input of the RPP 9, the clock pulses start to flow and the 9th. . At this time, the sensor 8 is supplied with a voltage U 8, proportional to the output parameters. This voltage and 8 are fed to the input of the comparator 14, the second input of which is supplied by the programmer 11, the voltage U .17, corresponding to the technological mode. If the power allocated by converter b to load 7 is greater than the set, i.e. voltage sensor B and 8 more voltage U 17 prog. . 35

0

five

Rammator 11 at the output of bnparator 14 appears o, if vice versa, then it appears 1, the output of comparator 14 is connected to the information input of the ppp 9. From this input, upon receipt of clock pulses u 9c, there is a sequential recording in ppp 9.

The 12-bits are recorded, when each bit is written, the voltage of the sensor 8 and the programmer 11 is compared in the comparator 14. When comparing, the first frequency value is set equal to 1/2 of the frequency range, with the second comparison, 1/4 is added or subtracted, and so on. until the 12th approximation.

After passing 12 clock pulses P1Sh 9 at the output of the CC, sets the conversion completion signal, which through the differentiating chain 15 enters the R input of the short-cut trigger 2. The trigger switches and the frequency set by the programmer II is set at the output of the converter b. Differentiating chain 15.

generates pulses, which prevents RS-flip-flop 12 from simultaneously applying control signals to both inputs. At the outputs of RPF 9, the information is stored until the next comparison process. If the technological regime has not changed, after comparing the RPF 9, the same information, qi, will be established.

The proposed device makes it possible to increase reliability by simplifying the device for controlling the output parameters of the converter while maintaining high accuracy and stability of regulation.

Claims (1)

Invention Formula An induction heating installation containing a static frequency converter, to the output of which is connected a parallel oscillating circuit, a program control device with input parameters of the converter, consisting of a programmer, a master oscillator. the output of which is connected to the control input of the converter, clock generator and RS trigger via serially connected counters, a key and sensor of the output parameter of the converter, characterized in that, in order to increase the reliability of The installation is entered into a serial approximation register and a comparator, and the programmer contains a timer and a source of reference voltage, the output of the latter and the output of the sensor of the output parameter are connected to the inputs of a comparator connected by an output to the information inputs of the register, a serial input, the building input of which is connected to the generator input clock pulses via a key connected by control- the main input to the output of the RS-flip-flop, the S-input of which is connected to the output of the timer, the R-input to the code of the End register conversion, sequential approximation, the outputs of which are connected to the information inputs of the counters, Compiled by O.Turpak Editor N.Rogulich Tehred M.Didyk Proofreader E.Lonchakova Order 5659/56 Circulation b32 VPIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Subscription