Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1998-04-22
1999-08-31
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327307, H03K 5153
Patent
active
059458534
ABSTRACT:
The current sensing circuit with automatic offset compensation is provided with a current sensing resistor, a difference amplifier which inputs this current sensing resistor voltage at its voltage measuring input terminal and inputs a reference voltage at its reference voltage terminal, and a measuring circuit which determines the current flowing in the current sensing resistor from the difference amplifier output voltage. The current sensing circuit adds a small bias voltage to the current sensing resistor voltage and inputs it to the voltage measuring input terminal to increase difference amplifier output voltage. The measuring circuit measures difference amplifier output voltage and compensates the reference voltage input to the difference amplifier reference voltage terminal to compensate difference amplifier output to 0V when current sensing resistor current is zero.
REFERENCES:
patent: 3989959 (1976-11-01), Renirie et al.
patent: 5103122 (1992-04-01), O'Leary et al.
patent: 5166632 (1992-11-01), MacKenzie
patent: 5798664 (1998-08-01), Nagahori et al.
Sanyo Electric Co,. Ltd.
Tran Toan
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