JPS54105749A - Control circuit - Google Patents

Abstract

PURPOSE: To operate a switching cycle of low → stop → high without stopping the operation, for operational handlings likely in air-conditioners, by constituting a circuitry where the power source is continued application for a certain length of time even after resetting of the switch by a stop signal of the operation.

CONSTITUTION: The construction is made by a switch 11, with a start-stop signal fed, a switching element 2, for conducting the main circuit at an operation of said switch 11, an bias supply circuit 5, a delay switching circuit 8, comprising a resistor 6 and a condenser 7, a load 9, a level discriminating method, comprising a transistor 13 for comparing outputs of the bias supply circuit 5 and the delay switching circuit 8, a holding method, comprising a transistor 14 operated by the output from said level discriminating method to hold a conduction of the switching element 2, and a diode 15 made parallel connection to the condenser 7 during an operation of the switch 11. After a resetting of the switch 11 by a stop signal, the supply of output can be made to the load for a certain length of time, thus capable of obtaining a control circuit suitable for a handling of the cyclic operation likely in air-conditioners.

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