ELECTRONIC TIME RELAY WITH ALL THE USUAL FUNCTIONS

摘要

The invention relates to an electronic time relay which may be used in the control installations of the electric drivers. According to the invention, the relay comprises two delay circuits (1, R, C, D, D; 2, R, C, D, D), with various delays, whereto the command is transmitted by means of two inverters (8, 9), the output of the first delay circuit (1, R, C, D, D) being connected, on the one hand to the input of a first AND-OR-NOT gate (5), on the other hand through an AND-NOT gate (10), which has the other input connected to the input of the first inverter (8), to an input into a second AND-OR-NOT gate (6), and on the other hand to the SET input of a bistable circuit R-S (12, 13) which has the output connected to another input of the second AND-OR-NOT gate (6), and the second delay circuit (2, R, C, D, D) has the output connected to another AND-NOT gate (11) which has the other input connected after the first inverter (8) and whose output is connected, on the one hand, to the RESET input of a bistable flip-flop circuit R-S (12, 13), and on the other hand, through an inverting gate (14) it is connected to an input of the first AND-OR-NOT gate (5), the outputs from the two AND-OR-NOT gates (5, 6) are connected to the inputs into a third AND-OR-NOT gate (7) whose output, through an inverting gate (15) and a logical amplifier with transistor (R, R, T), controls an electromagnetic relay (K), the functions of the electronic time relay being changed by means of two bi-positional switches (S, S) connected both directly and by means of some inverters (3, 4), to the free inputs of the three AND-OR-NOT gates (5, 6, 7) so as to allow the transmission, in four different ways, of the commands given from a contact (16) at the input of the first inverting gate (8), to the coil of the electromagnetic relay (K).