Current measuring circuit for measuring drive current to load

Details Current measuring circuit for measuring drive current to load Current measuring circuit for measuring drive current to load

2005-11-22

2005-11-22

Cabrera, Zoila (Department: 2125)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Product assembly or manufacturing

C323S316000, C324S765010

Reexamination Certificate

active

06968249

ABSTRACT:
When a voltage is supplied from a voltage supply terminal to a non-inverted input terminal of an operational amplifier, a voltage equal to the supply voltage is input to an inverted input terminal and also to a voltage apply terminal for a load. When PNP transistors constituting a current mirror turn on in response to the applied voltage, a source current flows through one of the PNP transistors to the load, and a mirror current of the source current flows through the other of the PNP transistors to a current measuring terminal. The current driven to the load can be obtained by measuring the mirror current with an amperemeter.

REFERENCES:
patent: 6859058 (2005-02-01), Manhaeve et al.
patent: 2002/0158654 (2002-10-01), Graf
patent: 2003/0057987 (2003-03-01), Ohlhoff et al.
patent: 2003/0071647 (2003-04-01), Schaefer et al.
patent: 2004/0046585 (2004-03-01), Kamieniecki et al.
patent: 2004/0232937 (2004-11-01), Ishibashi
patent: 11-23664 (1999-01-01), None

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