Welsh & Flaxman LLC
MOSFET based, high voltage, electronic relays for AC power switching and inductive loads
A MOSFET based, high voltage, high current AC electronic relay operating with normally closed contacts is disclosed. The relay includes at least one MOSFET switching circuit selectively switching between switch conducting and switch isolation. The at least one MOSFET switching circuit is normally closed and includes a plurality of inputs controlling the operation thereof. The plurality of inputs are connected to at least one rectifier such that a voltage differential exists between any two inputs of the MOSFET switching circuit providing a voltage source maintaining the MOSFET switching circuit normally closed. The relay also includes a control circuit linked to and controlling operation of the first transformer and second transformer. A switch for use in controlling operation of a MOSFET based, high voltage, high current AC electronic relay is also disclosed. The switch includes a key and a receptacle for selectively receiving the key at various positions. The receptacle includes a plurality of contacts for selective engagement with the key. The contacts includes first and second common contacts connecting to a common terminal, first and second relay block contacts connecting to a relay block, a normally closed contact coupled to a normally closed terminal and a normally open contact coupled to a normally open terminal. In use, the key is selectively positioned within the receptacle for placing the relay in an automatic mode, a normal mode or an energized mode.
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James M.
Lewis