SU472296A1 - Device for fixing electrical quantities - Google Patents

Description

one

The invention relates to electrical measuring equipment and can be used to fix the difference between two voltage levels.

Devices for fixing electrical quantities are known, comprising a starting and an execution relay, a reference memory capacitor, a cyclic discharge capacitor, a nonlinear element, such as a transistor, and a pulse counter.

However, such devices have low functionality, since they cannot fix the difference of electrical quantities.

The purpose of the invention is to improve the functionality of the device.

This is achieved by the fact that the proposed device additionally contains a reference storage capacitor, a diode, a resistor and a potential NAND circuit, the inputs of the NID circuit are connected via diodes and resistors respectively to the storage capacitors and the executive relay, and the output to the start circuit. pulse counter.

The drawing shows a diagram of the device.

The device for fixing electrical quantities contains reference storage capacitors 1 and 2, capacitor 3 for cyclic discharge, transistor 4, executive relay 5 with contacts 6 and 7, potential IS-HE 8, pulse counter 9, start relay (in its drawing winding not shown) with contacts 10, 11 and 12, diodes 13 and 14, resistors 15 and 16.

The device works as follows. When entering the inputs f / i and U2, the difference between which is to be measured, the starting relay is activated and connects its contacts 10 and 11 to the input

source and storage capacitors, and contact 12 bypasses the capacitor 3. After charging the storage capacitors, the starting relay switches and contacts the capacitors into a circuit composed of diodes, resistors, an executive relay, a transistor, a capacitor for cyclic discharge. The latter starts periodically charging, thereby turning on the executive relay.

The switching relay, by means of contact 6, bridges the capacitor, causing it to discharge. In each such cycle, contact 7 of the actuating relay is turned on, but the pulses are not recorded in the counter, since

At the output of the scheme, “AND-NO, there is no permission to write. Simultaneous cyclic discharge of both storage capacitors continues until the capacitor having the smallest capacity is completely discharged.

Charge. Next, only one storage capacitor is discharged, the output of the AND-NOT circuit is the potential that allows the counter to be started during each discharge cycle of the capacitor.

Thus, the number of discharge cycles recorded in the pulse counter as a specific number of pulses is proportional to the difference in the input voltages.

Subject invention

A device for fixing electrical quantities, containing starting and executive

A relay, a reference memory capacitor for cyclic discharge, a nonlinear element, such as a transistor, and a pulse counter, characterized in that, in order to expand its functionality, it also contains a reference memory capacitor, a diode, a resistor and a potential AND-NO circuit. , at the same time, the inputs of the circuit “NID are connected via diodes and resistors respectively to the storage capacitors and the executive relay, and the output is connected to the start circuit of the pulse counter.

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