LATCHED RELAY DRIVING CIRCUIT AGAINST PYRO-SHOCK FOR LAUNCH VEHICLE

摘要

A latched relay driving circuit is provided to realize a relay having high resistance to pyro-shock by increasing the power applied in the contact point of relay the latch relay driving circuit. A first optocoupler(110) outputs the high or low signal in response to an On command when the On command of the On drive of the relay(10) is blocked or accepted. A second optocoupler(120) outputs the high or low signal in response to an Off command when the Off command of the Off drive of the relay is blocked or accepted. A logic circuit part processes a signal outputted from the first optocoupler and the second optocoupler, and it outputs the High signal even if the On command is blocked. The first current darlington(Darlington) device(140) is installed at the logic circuit part and a relay interval, and the first current Darlington device converts the relay into the On contact state according to high signal of the logic circuit.