Circuit and method for reconstructing a phase current

Details Circuit and method for reconstructing a phase current Circuit and method for reconstructing a phase current

1995-11-20

1998-02-17

Cunningham, Terry

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327482, 327488, 361 31, 361 93, H03K 1756

Patent

active

057195196

ABSTRACT:
A phase current reconstruction circuit (10) senses and reconstructs a phase current in a phase bridges (12A). An amplifier (32) in a phase current reconstruction element (22) amplifies a voltage signal across a sensing resistor (18). The amplified voltage signal is transmitted to a sample and hold circuit (34), which reconstructs the phase current in the phase bridge (12A). An over-current comparator (36) compares the amplified voltage signal with a predetermined reference voltage to detect an over-current in the phase bridge(12A). If the over-current in the phase bridge (12A) is detected, an over-current latch (38) interrupts the pulse width modulation signal from a microcontroller (26) to a power switch (16A) in the phase bridge (12A), thereby switching off and protecting the power switch (16A) from damage that may be caused by the over-current.

REFERENCES:
patent: 3696305 (1972-10-01), Mitchell et al.
patent: 4209717 (1980-06-01), Mahony
patent: 4361769 (1982-11-01), Hatchett et al.
patent: 4691125 (1987-09-01), Rybicki
patent: 4771357 (1988-09-01), Lorincz et al.
patent: 4777578 (1988-10-01), Jahns
patent: 4860154 (1989-08-01), Fazlollahi
patent: 4890009 (1989-12-01), Miyazaki et al.
patent: 4928219 (1990-05-01), Roslund et al.
patent: 5233287 (1993-08-01), Lenk
patent: 5245523 (1993-09-01), Juzswik
patent: 5325258 (1994-06-01), Choi et al.
patent: 5502610 (1996-03-01), Chaney
patent: 5550702 (1996-08-01), Schmidt et al.

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