SU1251284A2 - Device for controlling triac converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control valve converters and is additional to auth. No. 928603. The purpose of the invention is to increase reliability. Comparators (K) 21 and 22, rectifiers 23 and 24, logical L. A C 1JL1 elements AND-NOT 25-28, a threshold element (PE 29 and a functional converter 30, implementing arcsinoidal dependence) are introduced into the device. - a mystical converter 31 is connected to an electric motor 32 with a feedback sensor 33 (tachogenerator). Reliability is raised due to the fact that using the rectifiers 23 and 24 and the PE 29 produces the minimum allowable value of the motor current reference signal, and K 21, 22 and logical The IS-NE 25, 26 H 27 determines the operating mode of the triac converter. In the case of a reduction in the current reference signal below the allowable value, in the rectifying mode, the output of control pulses to the symistors is blocked, and in the inverter mode, the blocking is prohibited. mode. 3 ill. a S (L U1 avL. 0 X) ke

Description

The invention relates to electrical engineering, namely to power converter technology and can be used to control the DC and AC current converters made on triacs.

The purpose of the invention is to follow the reliability of the device.

Figure 1 shows the diagram of the device according to auth. St. No. 928603; On fng.2 - the scheme of the proposed device; Fig. 3 shows voltage and current diagrams.

The device for controlling the simisatory transducer (Fig.) Contains a switching unit 1, the outputs of which are connected to the control inputs of the control keys 2 and 3, the outputs of which through the controller 4 are connected to the outputs a and B of the reference signal and the feedback signal control channels 5, 6 and 7 (the number of which is determined by the number of stimulators), each of which contains (in the drawing the execution of channel 5) block 8 of pulse-phase control, amplifier-shaper 9, zero-organs 10 and 1, and logs sh elements And 12 and 3. The outputs of the channels 5.6 and 7 control The device is connected to the trigger electrodes of the triacs 14, 15, and 16. The device also contains a sensor of conductivity 17 of the triacs to sensors 18.9 and 20 of the polarities of voltages on the triacs, and the output of the sensor 17 is connected to the first input of block 1 switching, the second input of which is connected to the output of the regulator 4, the outputs of the controlled keys 2 and 3 are connected to the inputs of the blocks 8 of the pulse-phase control in each control channel; and the outputs of the blocks 8 are connected to the first inputs of the elements And 12 to the short circuit, to the second the inputs of which are connected to the outputs of the block 1 switching, a: the third inputs through the zero-bodies 10 and 1 - the output of the polarity sensor on the corresponding triac and the outputs of the elements 12 and 13 are connected to the input of the amplifier-former 9 and the output terminal b,

FIG. The conclusions of 1-to and control of inputs of keys 2 are also marked.

Q

and 3, the output e is the input of the block 8 it-1 pulp phase control,

12842

The device is introduced into the device (FIG. 2, two co-drivers 21 and 22, two rectifiers 23 and 24, four loggical elements 25–28, a threshold element 29 and a functional transformation 30, realizing the arcsynusoidal dependence, with In this case, the inputs of the comparators 21 and 22 and the functional converter 30 are connected

 to pin 5 for connecting the feedback of the regulator, the outputs of the comparators 21 and 22 are connected to the first inputs of logic gates AND-NOT 25 and 26, respectively, the second inputs of which 5 are connected to the outputs of block 1

switching (outputs g and ij 1, the outputs of the logical elements AND-NOT 25 and 26 through the logical element AND-NOT 27 are connected to the input of the logical element 0 AND-NOT 28, the input of the rectifier 23 is connected to the output of the functional converter 30, the input of the rectifier caliper 24 - with the control inputs of blocks B of the phase-phase control 1 (output e) of all control channels, and the outputs of rectifiers 23 and 24 through the threshold element 29 are connected to the second input of the logic element 15-HE 28, the output of which is connected with

 the input of the amplifier-former 9 1 output e). To the output of the triac converter 31, an electric motor 32 is connected with a feedback sensor 33 (a t-generator).

35 The device operates as follows.

25

With the help of comparators 21, 22 and logical elements AND-NOT 25, 26

and 27, the mode of operation of the converter 31 is determined. This is done in the following way. The comparators 21, 22 exceed the bipolar feedback voltage from the tacho generator 33

S logical signals, which are then compared by logical I-NEs 25 and 26 with signals for setting the direction of the current, are removed from the terminals of the p and the converter. At 6

In accordance with the direction of the current and the direction of rotation of the electric motor G-bodies 32, the rectifying mode takes place and at the inputs of the element AND-HE 27 there will be anti-signaling signals.

If these signals do not match, we have an inverter mode - both signals will be equal and the AND-NOT element 27 through the I-KE 28 element will lock out

u.

L n, 31

It locks the control pulses on the trims in the converter 31.

The functional transducer 30 has arcsinus dependence

Ug. , arc sin,

where Ug is the control voltage at its output; the relative value of the EMF of the electric motor; the amplitude value of the light voltage at the input of the converter 31. The presence of such a converter allows to obtain the control angle, defined by the equality Cfi - arc sin, proportional to Ug and the corresponding rotation of the electric motor 32 at idle,

With the help of rectifiers 23 and 24, the voltage modules are extracted from the output of the functional converter 30 / U / and the control voltage at the input of blocks 8 of the pulse-phase control / Uo / Module difference / U. | - it is compared at inputs of threshold element 29 with bias voltage U, corresponding to the minimum motor current of which the control pulses are removed (Fig. 3). In this case, if in rectification mode / Uij / - / U /

and

cm

then the threshold element 29 blocks the switching of the AND-NOT element 28 and permits the issuance of pulses to the symistors, and if / Uy / - / Ug / ti then the switching of the IS-HE element 28 and removal of the control pulses from the triacs is permitted.

The increase in reliability is achieved due to the fact that with the help of rectifiers 23 and 24 and the threshold element 29 the minimum permissible value of the signal for setting the current of the motor is selected, and with the help of comparators 21

five

 About 5

0 0

five

five

0 5

2844

and 22, and the NAND gate 25, 26, and 27 determine the operation mode of the triac converter. In the case of a decrease in the current reference signal below the permissible value (less than AND), in the rectifying mode, the firing of control pulses on the triacs is blocked, and in the inverter mode, the blocking is inhibited. This eliminates emergency mode.

Claims (1)

Invention Formula A device for controlling a simulator converter according to the author, No. 928603, characterized in that, in order to increase reliability, two comparators, two IS-NEs, a threshold element and a functional converter that implements arcsine dependence, while the inputs of both comparators and the functional converter are connected to the output for connecting the feedback of the controller, the output of each. From the comparators is connected to the first input of the corresponding logical element IS-NOT, the second inputs of which are connected respectively to the outputs of the switching unit, the outputs of both AND-NOT logical elements are connected via the third logical element AND-NOT to the input of the fourth AND-NOT logic element, the input of the first rectifier is connected to the output of the function converter, the input of the second is from control inputs of the pulsed-phase ynpias blocks of all channels, and the rectifier outputs through the threshold element are connected to the second input of the fourth NAND logic element, whose output is connected to the amplifier input — ovatel. Uc - and t si-r cot  f   and y FIG. 3