Self-protecting switch apparatus for controlling a heat element

Details Self-protecting switch apparatus for controlling a heat element Self-protecting switch apparatus for controlling a heat element

1997-11-20

1998-12-08

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

307127, H02H 318

Patent

active

058479112

ABSTRACT:
Current flow between a battery (14) and electrical ground (18) and through a load (16) is controlled by an apparatus (10). Preferably, the load (16) is a seat heat element. A current direction sensitive MOSFET (34) acts as a switch to control the current flow. The MOSFET (34) has a source (40) connected to the load (16), a drain (42) intended for connection to a positive terminal (26) of the battery (14), and a gate (46) for receiving a control voltage. Transistors (56, 66) control the voltage at the gate (46) of the MOSFET (34). The apparatus (10) is self-protecting against damage upon reverse polarity connection of the battery (14). A switch-protecting resistor (36) is intended for connection to electrical ground (18). The switch-protecting resistor (36) provides a path for electrical energy from the battery (14) to the gate (46) of the MOSFET (34) when the battery (14) is reverse polarity connected.

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