Solid state switch with last state memory

Details Solid state switch with last state memory Solid state switch with last state memory

H - Electricity

03

K

H03K 17/26 (2006.01) H03K 17/24 (2006.01) H03K 17/687 (2006.01)

Patent

CA 2045028

SOLID STATE SWITCH WITH LAST STATE MEMORY ABSTRACT OF THE DISCLOSURE A solid state switch is provided which has the capability of retaining its last state memory in the event of a power failure or interruption. The solid state switch includes an output driver formed of at least one N-channel MOS field-effect transistor, a holding capacitor, a charging resistor, a transistor-connected diode interconnected between a power supply voltage source and the charging resistor for preventing leakage of the holding capacitor. The field-effect transistor has its drain connected to a first output terminal and it source connected to a second output terminal. One end of the holding capacitor is connected to the gate of the field-effect transistor and its other end is connected to a ground potential. The holding capacitor retains the last state between the first and second output terminals in the event of a loss of the power supply voltage source.

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