Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1991-06-28
1993-05-11
Ro, Bentsu
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318256, 318280, 318287, 318291, H02P 122
Patent
active
052104753
ABSTRACT:
An improved current sensing circuit is provided in, or for use with, a power delivery circuit having a current controlling device of the type which includes auxiliary current sensing terminals. The current sensing circuit is particularly useful in conjunction with a respective current sensing power MOSFET located in the "high side" of a switching circuit, such as an H-bridge switch for a bidirectional load. The current sensing circuit has two branches connected to the current sensing MOSFET and to a reference potential and constructed to provide an output voltage signal representative of the main current through the current sensing MOSFET. The first branch includes at least two transistors and a resistor serially connected between a current sense terminal of the MOSFET and a reference potential. The second branch also includes at least two serially connected transistors connected between a terminal of the MOSFET and the reference potential. The transistors are cross-connected between branches and provide an inverted current mirror and a current mirror. Fifth and sixth transistors may also be included as part of the current sensing circuit.
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Juzswik David L.
Wrenbeck Bruce R.
Ro Bentsu
United Technologies Automotive
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