SU444157A1 - Amplitude differential nullorgan - Google Patents

Description

I

The invention relates to electrical measuring equipment and can be used in AC bridges and compensators, as well as tolerance control devices.

Amplitude-differential null-organ is known, which contains input matching blocks connected to the inputs of the adder and the subtraction unit, a phase shifter connected to the output of the subtraction unit, sawtooth voltage forming units consisting of a series-connected amplifier-integrator and an integrator connected to the output reset pulse generator, and comparison circuits.

The purpose of the invention is to increase the speed of the device.

This is achieved by the fact that keys, a clock pulse generator, are entered into an amplitude-differential zero-body,

connected to the control inputs of the keys and matching circuits, the outputs of the adder and phase shifter are connected to the corresponding inputs of the sawtooth forming unit and the reset pulse generator connected between each other, the output of one sawtooth forming unit through the first key is connected to the first inputs coincidence circuits, the second inputs of which are connected via a second switch to the outputs of another sawtooth voltage forming unit, the output of the second switch is connected to one of the inputs of the comparison circuits The other inputs of which are connected to the pair-connected outputs of the coincidence circuits:

Figure 1 shows the block diagram of the proposed device; 2 is a vector diagram; The FIG. 3 pa charts are timing diagrams explaining the operation of the device.

The device contains input matching blocks 1 and 2, adder 3, subtraction unit 4, phase shifter 5, limiter amplifiers 6 and 7, integrators 8 and 9, resetting drivers 1O and 11, keys 12 and 13, generator 14 clock pulses of circuit 15- 18 matches And, circuits 19, 2O comparison, compared signals And g and I ", arriving at the input of the amplitude-differential zero-body. The compared signals And and Ir through matching blocks 1.2 in parallel, podak) gs to adder 3 and to subtraction unit 4, where the auxiliary с total-AND and differential AND signals f, -.,. --- .- p Then Ir and rotated by an angle ii, in the phase shifter 5, the difference signal Id is converted into identical channels before being fed into the matching circuits 15-18, so that only one signal can be considered, for example, the sum And. The total signal is fed to limiting amplifier 6, where rectangular pulses of different polarities are generated. They are fed to a two-pole integrator 8, which integrates them during the thinning half-cycle of right-angled pulses. The voltage at the output of the integrator increases according to the law of the saw, reaching the amplitude of the input pulse at the end of its duration. At the same time, a reset pulse is sent to the integrator 8 from the reset pulse generator 10, and the integrator is instantaneously discharged. As a result, sawtooth signals of the same frequency as the input signals are formed at the integrator output. The sawtooth pulses from the integrator output 8) U) CTynaj (jT to the scheme for extracting the instantaneous amplitude value of the sawtooth pulse after a certain period of time, depending on the frequency of tracking of the clock1) pulses of the key 12 and the clock pulse generator 14. At the output of the key 12 mcf, short pulses of different amplitudes and polarity | - u. The signal twisted by the angle (+) difference is converted in a similar way. At the output of the secondary key 13 also short pulses of different amplitude and polarity appear, key 12 to Short pulses of different polarity and amplifiers arrive in parallel at the signal inputs of all four pairs of matching circuits 15-18. With the release of key 13 short pulse}. applied to the paral sol parlo (011P1e inputs of all four coincidence circuits and simultaneously to the second inputs:; hem comparison 19 and 20. The output of all schemes C (; vpapi pplyatsya and pilts, popavayek.sh to the signal input, and if there is a corresponding -, signals at both inputs. The coincidence circuits are constructed in such a way that the pulses are separated by polarity. At each individual moment, a signal appears on only one of the coincidence circuits,: Comparison circuit 19 compares modulo the amplitude of unipolar and shuhls, so odan from her entrance The signals are connected to the outputs of the coincidence circuits 15,16, and the second to the output of the key 13. If the magnitude of the signal amplitude from the coincidence circuits is greater than the magnitude of the pulse amplitude from key 13, then a signal appears at the input of the comparison circuit, otherwise - No. Comparison circuit 20 compares modulo amplitudes of opposite-polarity pulses, therefore O.DIN from its inputs is connected to the outputs of coincidence circuits 17, 18, and the other output of key 13, If the magnitude of the signal amplitude from the coincidence circuits 17.18 is less than the amplitude of the pulse, next with clue and 13, the output of the comparison circuit 20 is a signal with the opposite / Gooch signal at the output of the comparison circuits no. The presence of a signal at the outputs of the comparison circuits means that the total signal ojie causes the phase to be turned through an angle (± -) difference, and that the integral voltage of the signal voltage And ,, more amnlituda voltage signal; and And.,. 1 i redemets of the invention Amn / ipdudi-di114e1: an elliptic body containing the input connection blocks connected to the inputs of the adder and the output unit, phase shifter w connected to the upper output of the subtraction unit, blocks forming the sawtooth 1 ×) gpes, which are from the sequentially connected amplifier of the limited system and integrator connected with the output of the resetting device to the driver, and cxivibi of comparison, about t and h and c; By the fact that, from the purpose of the operation, byte.-o-), keys, general-action impulses, connected to the control inputs of cells, and the coincidence circuits, n |; and the outputs of the adder and 1 |) a (lc) of the drive are connected to it to the corresponding c (single between (; both of the inputs of the sawtooth- forming unit, HOI.), and for example, the pulse former

reset, the output of one sawtooth voltage shaping unit through the first key is connected to the first inputs of the coincidence circuits, the second inputs of which are connected via the second / key to the outputs of another unit

generating a sawtooth voltage, the output of the second key is connected to one of the inputs of the comparison circuit, the other inputs of which are connected to the pair-connected outputs of the matching circuit.

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