POWER SUPPLY PROTECTION CIRCUIT CAPABLE OF PREVENTING A FAILURE IN A MOBILE SATELLITE COMMUNICATION APPARATUS RESULTING FROM ERRONEOUS CONNECTION

摘要

In a power supply protection circuit for use in amobile satellite communication apparatus which is connectedto an external power supply for driving a load circuittherein, first and second relay switches electricallyconnect a power supply line to the load circuit when thepower supply is normally connected in polarity andinterrupt the power supply line leading to the load circuitwhen the power supply is erroneously connected in polarity.The first and the second relay switches are controlled by adiode. A resistor supplies a current level adapted tooperate the first and the second relay switches and thediode.