초록 ▼

Electrical systems (20), such as an electric propulsion system for a vehicle (100) for example, often have electric power available for components of the system (20) when non-operating conditions occur, such as turning off the vehicle key switch (38). An electronic control circuit (10) is provided f

Electrical systems (20), such as an electric propulsion system for a vehicle (100) for example, often have electric power available for components of the system (20) when non-operating conditions occur, such as turning off the vehicle key switch (38). An electronic control circuit (10) is provided for controllably interrupting power flow to the system (20) and disabling the system (20) in response to any of a plurality of non-operating conditions. The electronic control circuit (10) includes a transistor (26) having a base (30), an emitter (28), and a collector (32) and being energized to an on condition in response to the base (30) receiving a preselected signal. The signal is controllably delivered to the base (30) in response to a first switch (38) being open and is controllably delivered to the base (30) a preselected time after a second switch (68) is opened.

대표청구항 ▼

An electronic control circuit (10), comprising: a transistor (26) having an emitter (28), base (30) and collector (32), and being energizable between an off condition and an on condition at which the emitter (28) and collector (32) form a path for current flow through the transistor (26), said trans

An electronic control circuit (10), comprising: a transistor (26) having an emitter (28), base (30) and collector (32), and being energizable between an off condition and an on condition at which the emitter (28) and collector (32) form a path for current flow through the transistor (26), said transistor (26) being energized to the on condition in response to the base (30) receiving a signal of a preselected magnitude and polarity; first means (34) for controllably delivering the signal to the base (30), said first means (34) including a first switch (38) movable between an open position and a closed position and first and second terminals (40,42) of a size sufficient for receiving power from a power supply (16), said first means (34) delivering the signal to the base (30) in response to the first switch (38) being in the open position, said first means (34) including a second transistor (44) having an emitter (46), a base (48) and a collector (50) and being energizable between an on condition and an off condition at which the first transistor (26) is turned on and means (52) for coupling the second transistor (44) to the first transistor (26), first switch (38), and first and second terminals (40,42) for biasing the second transistor (44) to the on condition and biasing the second transistor (44) to the off condition in response to the first switch (38) being open and in response to one of the first and second terminals (40,42) failing to receive power from the power supply (16); and second means (36) for controllably delivering the signal to the base (30), said second means (36) including a second switch (68) movable between a normal position and an actuated position, said second means (36) delivering the signal to the base (30) a preselected time after moving the second switch (68) to the actuated position.