Interface circuit between a direct-current voltage source...

Electrical transmission or interconnection systems – Vehicle mounted systems

Reexamination Certificate

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Reexamination Certificate

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10395228

ABSTRACT:
An interface circuit is described for use between a direct-current voltage source and a circuit for the pulsed driving of a load such as an electric motor, in parallel with which at least one high-capacitance capacitor is connected, the interface circuit comprisinga MOSFET transistor connected to a control circuit suitable for driving the transistor in accordance with predetermined procedures.The interface circuit comprises a first supply terminal and a second supply terminal which are intended operatively to be connected to the voltage source, permanently and temporarily, respectively.A circuit for controlling current conduction in the MOSFET transistor is connected to the gate of the transistor and, each time it receives an activation signal, brings about an initial transitory stage in which a progressively increasing current is conducted through the transistor and in which the transistor is operating in the linear region of its characteristic, and a subsequent, or steady-state stage in which the transistor is operating in conditions of substantial saturation.An enabling circuit is connected to the second supply terminal to keep the MOSFET transistor non-conductive when the second supply terminal is disconnected and to supply an activation signal to the circuit for controlling current conduction when that terminal is connected to the voltage source.

REFERENCES:
patent: 5541531 (1996-07-01), Kultgen
patent: 5710699 (1998-01-01), King et al.
patent: 6046896 (2000-04-01), Saeki et al.
patent: 6534939 (2003-03-01), Kato et al.
patent: 2001/0033501 (2001-10-01), Nebrigic
patent: 0 708 515 (1996-04-01), None

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