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US 7,622,874 B2Granted
Over current detection circuits for motor driver
AssigneeShenzhen STS Microelectronics Co., Ltd.
InventorsChunxing Deng, Wenli Luo
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AssigneeShenzhen STS Microelectronics Co., Ltd.
InventorsChunxing Deng, Wenli Luo
Estimating the term…
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 VGS of 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.
A motor driver having over current detection circuitry comprising:
An over current detection circuit for an H-bridge;
An over current detection circuit for an H-bridge motor driver comprising:
Dependencies are inferred from the claim text.