Over current detection circuits for motor driver

Details Over current detection circuits for motor driver Over current detection circuits for motor driver

2007-03-30

2009-11-24

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S474000, C361S031000

Reexamination Certificate

active

07622874

ABSTRACT:
A motor driver includes an H-bridge having a first differential input, a second differential input, and a differential output; a sensing circuit coupled to the differential output of the H-bridge; a comparison and logic circuit coupled to the sensing circuit; a pair of pre-driver circuits coupled to the comparison and logic circuit for driving at least one of the differential inputs of the H-bridge; and a pair of level shifters coupled between the comparison and logic circuit and the sensing circuit. The pair of level shifters is used to assure that the VGSof a pair of serially coupled transistors in the sensing circuit do not change with temperature, motor current, or voltage, and each includes a transistor receiving a reference current. The pair of level shifters each further includes a serially coupled diode and zener diode for preventing current from flowing from the differential output of the H-bridge to the level-shifting transistor.

REFERENCES:
patent: 4435749 (1984-03-01), Grubbs
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patent: 5642247 (1997-06-01), Giordano
patent: 5773945 (1998-06-01), Kim et al.
patent: 5801503 (1998-09-01), Kim et al.
patent: 6741047 (2004-05-01), Horng et al.
patent: 7239182 (2007-07-01), Fukazawa et al.
patent: 2000-082946 (2000-03-01), None

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