SU622200A1 - Phase-time interval converter - Google Patents

Description

one

The invention relates to automation and metering technology and can be used to measure the sigallin phase shifts of analog sensors.

The phase-time converters 1J are known, containing a threshold element, the output of which is connected through a differentiating chain to the trigger input, the output connected to the input of the second differentiating chain.

The disadvantage of such a converter is, in its complexity, caused by the presence of two phase conversion channels.

The closest solution to the invention is the converter 2, which contains switches, the outputs of which are connected to the signal input of the threshold element, the output connected via a differentiating chain to the trigger input.

However, it has a complex functional circuit due to the need to use external control signals.

The purpose of the invention is to simplify the converter.

This is achieved by introducing a pulse shaper and an additional differentiating chain into it, the direct and inverse outputs of the trigger are connected to the corresponding control inputs

switches, and the inverse output of the trigger through a series-connected additional differentiating chain; the pulse shaper is connected to the reference input of the threshold element.

The drawing shows the fuktsionalna scheme of the proposed Converter.

The inverter contains switches 1 and 2, the outputs of which are connected to the signal input of the threshold element 3, the output connected via differentiating chain 4 to the input of trigger 5, the direct and inverse outputs of which are connected to the corresponding control inputs of switch 2 and 1. The inverse output of trigger 5 through connected in series an additional differentiating chain 6 and a pulse shaper 7 are connected to the reference input of the threshold element 3. The signal inputs of the switches 1 and 2 are connected to the analogue sensors new signals (not shown). The actual output of trigger 5 is the output of the converter.

The converter works as follows.

The inputs of the switches 1 and 2 receive signals that are shifted in phase. In the case of a logical “About the direct output of trigger 5, switch 1 passes the input signal to

the input of the threshold element 3, while the switch 2 of the other signal does not pass. When the input signal reaches the trigger level of the threshold element 3, the latter through the differentiating chain 4 feeds the trigger 5, an impulse, which sets its logical "1" output to the control input of the switch 2. The switch 2 starts to pass the signal to the input of the threshold element 3, Switch 1 signal does not pass.

When the output of the switch 2 reaches the trigger level of the threshold element 3, the latter, via the differentiating chain 4, supplies a pulse 5 to the trigger 5 input, which sets at its output a logical "O input to the switch 2 which stops passing the signal. The transition from logical "1 to logical" O at the output of flip-flop 5 through an additional differentiating chain 6 starts the pulse shaper 7, which maintains the second input of the threshold element 3 signal that exceeds its triggering level until the signal starts to pass by switch 1. After the pulse ends driver 7, the converter operation cycle is repeated.

The time interval during which

its output has a logical "1, proportional to the phase without an external trigger signal, which allows us to simplify the device and automate the phase conversion process.

Claims (2)

1. Limonov, AS and others. Measuring the phase difference of high accuracy. “Instruments and Experimental Technique, No. 6, 1974. 2.ABTQpcKoe USSR certificate No. 394830, cl. G 08 C 9/00, 1971.