Current and voltage-sensing

Details Current and voltage-sensing Current and voltage-sensing

1997-09-29

1999-04-06

Berhane, Adolf Deneke

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

363 21, G05F 326, H02M 3335

Patent

active

058923551

ABSTRACT:
An integrated circuit (1) includes a voltage-sensing circuit (2) and a current mirror (3) for sensing both a voltage (Vi) and a current (Ii) at one input terminal (T) of the integrated circuit. The voltage-sensing circuit (2) has an input which is connected to the input terminal (T) and an output which supplies a voltage level indication (Vu). The current mirror (3) has an input which is also connected to the input terminal (T), a reference terminal which is connected to a reference potential, and an output which supplies an output current (Iu). The input of the current mirror has a high impedance as long as the voltage level (Vi) is below a threshold voltage (Vth) of the current mirror (3). Within a voltage range determined by this threshold voltage (Vth), the voltage level indication (Vu) is a measure of the voltage level (Vi). The current mirror (3) becomes active and the output current (Iu) is a mirrored input current (Ii) if the voltage level (Vi) exceeds the threshold voltage (Vth). The threshold voltage may be determined by an input transistor (T1) of the current mirror (3). This input transistor (T1), which is arranged as a diode, starts conducting when the voltage level (Vi) reaches the threshold voltage (Vth) of this diode.

REFERENCES:
patent: 5262713 (1993-11-01), Agiman
patent: 5264782 (1993-11-01), Newton
patent: 5418674 (1995-05-01), Davies et al.
patent: 5666043 (1997-09-01), Henry et al.
patent: 5680034 (1997-10-01), Redl
"Motorola Semiconductor Technical Data High Flexibility Green SMPS Controller: Fixed Frequency, Variable Frequency, Standby Mode" MC44603, No date.

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