SU1269044A1 - Device for tolerance checking of peak values of voltages - Google Patents

Description

 .

The invention relates to electrical measurements and can be used in control systems and automatic control of the level of voltage value.

The purpose of the invention is to increase the noise immunity and reliability of control by providing an overlapping control of the input signal in even and odd half periods.

FIG. Figure 1 shows the functional electrical circuit of the device for tolerance control of peak voltages in FIG. 2, epres of voltages for various points of the functional circuit.

The device for tolerance monitoring of peak values of the control unit contains channels 1 and 2 of the control and the driver 3 strobe, each of the channels 1 and 2 of the control contains a threshold element 4, the first is the sixth element And 5-10, the first is the third trigger 11-13 and the first 14 and second 15 elements OR,

Shaper 3 gates contains a threshold element 16, the counting trigger 17, the first 18 and second 19 delay elements, the first 20 and second 21 elements AND, as well as the first 22 and second 23 elements OR NOT.

The device works in the following way.

The monitored signal (Fig. 2h) through the input terminal simultaneously arrives at the inputs of channels 1 and 2 of the control.

Channels 1 and 2 of the control of the upper and lower levels of voltage are intended for separate comparison of the peak value of the monitored signal UK to the upper limit of the u: n Uon limits of the tolerance zone, while the high amplitude of the monitored signal corresponds to a high potential at the outputs of channels 1 and 2 (11), a low amplitude of the monitored signal Ujf corresponds to a low potential at the outputs of channels 1 and 2 of the control (O), and the amplitude level of the Walg and, Up ,, corresponds to a high potential at the output of the channel. entsial on output channel 1 (01).

The 3 gate generator is designed to form a signal

690442

synchronization strobe pulses S1-S6 (Fig. 2). strobe pulses

51 and .32 (Fig. 2g, O are intended to provide separate

5 in time for analyzing the amplitude level of the voltage of the monitored signal by the triggers 13 and 11, respectively; strobe pulses S3 and S4 (Fig. 2) for setting the flip-flops 11 and 13 in

10 initial (zero) state before exposure to S1 strobe pulses and

52 respectively; strobe pulses

55 and S6 (Fig. 2, L) - for rewriting the state of the triggers 11 and 13 in

15 trigger 12 after exposure to strobe pulses S1 and S2, respectively.

The monitored signal and the synchronization signal may have an arbitrary shape, and the repetition period of the synchronization signal must be greater than or equal to the repetition period of the monitored signal.

The strobe pulse shaper S156 (Fig. 2P-l) operates in the following 25 ways.

The synchronization signal (FIG. 2a) from the synchronization input is fed to the input of the threshold element 16, which forms a periodic pulse signal (FIG. 25), the repetition period of which is equal to the period of the sync signal. This signal-counting trigger 17 forms a periodic pulse signal (square wave) with a pulse duration equal to the synchronization signal period (Fig. 2E,). The signal from the inverse output of the trigger 17 is delayed by delay element 18, at the output of which strobe pulse ST are generated. and S2 (Fig. 2g, k), the duration of each of which is equal to the repetition period of the synchronization signal, and their phases are opposite.

Element And 20 forms a strobe-pulse 45 S3 (Fig. 2e), the position in time of which is determined by the strobe pulse -S2 (Fig 2k) and the delay time of the delay element 18. Element And 21 forms a gate pulse S5 50 (FIG. 2j), the position in time of which is determined by gate pulse S1 and the delay time of delay element 19.

The OR-NOT 22 element forms a strobe, pulse 84 (Fig. 2k |), the time parameters of which are determined by the strobe pulse 82 (Fig. 2k) and the delay time of the delay element 18. The OR-NO 23 element forms a strobe pulse S6 (Fig. 2L), the time parameters of which are determined by the strobe pulse S1 (Fig. 2g) and the delay time of the delay element 19.

The channels T and 2 of the control of the upper and lower levels of voltage are essentially identical, therefore the operation of the device is considered on the example of the operation of channel 2 of the control of the lower level. Strobe pulse S3 (FIG. 2e), the trigger 13 is reset, when the instantaneous value of the monitored signal exceeds the level Uonj at the output of the threshold element 4, a high voltage level appears. If the instantaneous value of the monitored signal Ux exceeds Upn during the action of the strobe pulse S1 (Fig. 2g), then with the decoder signal of the element 7 (Fig. 2o) the trigger 13 is set to state 1 (Fig. 2p). The trigger 13 sets in 1 the trigger 12 (Fig. 2T), affect him

through the element And 10 and the element OR 15. If during the operation of the strobe pulse S1 signal and does not exceed the level

, then the trigger 13 remains in

op

O, and during the action of the strobe pulse S5 (Fig. 2), the trigger 13 sets the trigger 12 to the same state, acting on it through the AND 8 element and the OR 14 element.

The strobe pulse S4 (Fig. 2i) sets the trigger 11 to the initial state O. If the instantaneous value of the controlled signal Uy exceeds Uon2 during the action of the strobe pulse S2 (Fig. 2k), then the output signal of the element 6 (Fig. 2n) the trigger 11 is set to state 1 (Fig. 2c), the trigger 11 sets the trigger 12 (fig.2t) to the same state through an AND 9 element and an OR 15 element. If, during the strobe S2, the signal and (does not exceed the level then the trigger 11 remains in the state O, and during the action of the strobe-pulse S6 (Fig. 2n) the trigger 11 sets the trigger 12 to the same state, acting on it through the element AND 5 and the element OR 14.

At the same time, in the upper control channel 1, the input signal is compared with the value of

and,

from

The operation of channel 1 control is completely analogous to the operation of channel 2 control.

Further, the measurement cycle is repeated in each period of the sync signal 1i.

Claims (1)

1. A device for the tolerance control of peak significant voltages containing a gate driver and two control channels, each of which contains a threshold element, two triggers, an AND element and an OR element, the inverse output of the first trigger connected to the first input of the And element whose output is connected to the first input of the OR element, the output of which is connected to the R input of the second trigger, whose input is the corresponding output of the device, the second inputs of the elements AND of both channels are combined and connected to the first output of the form1 p gate of the gate, the second output of which is connected to the R-BXO of the first triggers of both channels, the inputs of the threshold elements of both channels are combined and are the input of the device, characterized in that in order to improve noise immunity and reliability of control, a third trigger is introduced into each control channel OR and the third, third, fourth, fifth and sixth elements AND, the output of the threshold element in each channel is connected to the first inputs of the second and third elements AND, the INPUTS of which are connected to the S inputs of the first and third trig respectively, the direct outputs of which are connected to the first inputs of the fourth and fifth AND elements, the outputs of which are connected to the first and second inputs of the second OR element, the output of which is connected to the S input of the second trigger, the inverse output of the third trigger And, the output of which is connected to the second input of the first element OR, the third and fourth outputs of the gate generator are connected respectively to the R input of the third trigger and the second input of the sixth element And both control channels, the second the inputs of the second and fourth elements And are connected to the fifth output of the gate driver, and the second inputs of the third and