SU696405A1 - Voltage comparator - Google Patents

Description

The invention relates to the field of automation, telemechanics, information-measuring equipment and can be used in systems of automatic control and regulation. There are known devices for comparing voltages 1 and 2. Of the known devices for comparing voltages, the device is closest to the technical nature of the invention. containing diode-regenerative compartors, the first inputs of which are connected to the output of the input voltage source and the input of the source of the compared voltage, the second inputs to the output of the source the output voltage of the compared voltage, and the outputs, respectively, with the first and second inputs of the OR-NOT element and the first trigger, the first and second outputs of which are connected respectively to the inputs of the first and second integrating elements 2. The low speed of the device is due to the increase in the time lag input voltage with decreasing potential disturbing effects of the input signal. The purpose of the invention is to increase the speed of the device. This goal is achieved by introducing amplifiers into the proposed device, the second trigger, the NAND element, the rectifier and the switch, the first, second, third and fourth inputs of which are connected respectively to the first and second outputs of the first and second triggers. The first and second inputs of the NAND element, respectively, are connected via the first and second amplifiers to the outputs of the first and second integrating elements, and the output via a rectifier to the first output of the second trigger, whose input is connected to the output of the OR NONE element. FIG. 1 is a functional block diagram of a device for voltage comparison; in fig. 2 - time schedules, to explain the operation of the device. The device contains an input voltage source. 1, the source of the compared voltage, made in the form of a phase-shifting circuit 2, diode-regenerative comparators 3 and 4, the first (modulating) trigger 5, the element OR NOT HE, the first

7 and the second 8 integrating elements of the second (controlling) trigger 9, the switch 10, the first 11 and the second 12 at the silica gel, the AND-HE element 13 and the rectifier 14. In FIG. 2 designates the output signals Uj U of the comparators 3, 4 of the trigger 5, the element OR-NOT 6, the integrating elements of the trigger 19, the switch 10, the amplifiers 11, 12 and the element IS-HE 13, respectively.

The device works as follows.

The disturbing effect of the input signal from source 1 is transmitted to one input of comparators 3 and 4 directly, and to others through a phase-shifting circuit 2. As a result, the pulse frequency is controlled at their outputs. The pulses of ultrasonic and and (fig. 2) comparators 3 and 4 are fed to the inputs of the trigger 5 and the element OR NOT 6. From the output of the trigger 5, the paraphase is received and the pulse-modulated (PWM) signal AND 5, which goes to the inputs of the elements 7 and 8 and through the switch 10 to the output of the device C of the outputs of the integrating elements 7 and 8, the integral signals are removed. (U-j and Ug). the amplifiers 11 and 12 arriving at the ports and having maximum values either at the beginning or at the end of the latitudinal modulation period, depending on the ratio of the pulse frequency from the outputs of the comparators 3 and 4. Amplifiers 11 and 12 amplify the integral signals and make their threshold limits. Uj signals. and} with

amplifiers 11 and 12 are fed to the inputs of the element AND-NOT 13. The element AND-NO 13 in the presence of one of the integral pulses at its inputs produces a single signal j that does not affect the operation of trigger 9 due to the locking effect of the rectifier 14. In the absence of integral the pulses at the outputs of elements 7 and 8, the IS-NE 13 element blocks the zero potential of the trigger 9 via rectifier 14, this happens when the .symmetric signal at the output of the trigger 5 when the pulses between the two half-periods of the PWM signal to each of its inputs come in half as long as period x sequencers. When the following pulses coincide at the input of the OR-NOT 6 element, a coincidence pulse appears at its output, arriving at one of the inputs of the trigger 9, which, when triggered, switches the switch 10. Switch

10 switches the phases of the PWM signal at the output of the device, which eliminates the falsity of the output information about the disturbing input effect of one half-period of the PWM signal relative to its other half-period as the effective value of the paraphase prevailing in one of the directions.

An increase in the number of elements of the output information per unit of time, the arrival rate of which depends little on the input disturbances due to a small change in the pulse frequency of the diode-regenerative comparators, as well as because it is obtained in a form convenient for direct use of the pulse amplifiers at the output, give the device advantages when used in high-speed automatic control devices.

Claims (1)

1. USSR author's certificate number 440648, cl. Q 05 B 1/01, 07.07.72. 2, USSR Author's Certificate No. 617712, cl. Q 05 B 1/01 1978 0 (prototype). ln Jl JLJULJlJOLJlJl n l-rLJl JLJLJL n Jl n n Jl Us h eight / f L. at / g