| 摘要 |
FIELD: electrical engineering. SUBSTANCE: auxiliary relay has first transistor; relay coil with making contact; voltage regulator diode; first capacitor whose first terminal is connected to input terminal of auxiliary relay and to that of voltage regulator diode; second capacitor; first resistor whose first terminal is connected to second terminal of first capacitor and to first terminal of second capacitor, as well as to emitter of first transistor; additional variable resistor whose first extreme adjusting terminal is connected to second terminal of first resistor and second extreme terminal, to output terminal of voltage regulator diode; second variable resistor whose first extreme terminal is connected to first input terminal of auxiliary relay, adjusting terminal, to second terminal of second capacitor and to base of first transistor, and second extreme terminal, to third terminal of second resistor; second transistor whose collector is connected to base of first transistor; third resistor whose first terminal is connected to base of second transistor and to collector of first transistor; fourth resistor whose first terminal is connected to emitter of second transistor and to second terminal of third resistor; third transistor; fifth and sixth resistors; and diode whose input terminal is connected to collector of third transistor and to first terminals of relay coil and making contact, second terminal of the latter being connected to emitter of third transistor, to first terminal of auxiliary relay, and to first terminal of fifth resistor; second terminal of the latter is connected to that of fourth resistor and to base of third transistor; second terminal of relay coil is connected to second input terminal of auxiliary relay, to output terminal of diode, and to first terminal of sixth resistor whose second terminal is connected to second extreme terminal of second resistor. EFFECT: fool-proof design preventing unwanted off-operation due to breaking delay provision. 3 cl, 1 dwg |
