Configuration, frequency registers generating power from motor in supply-loss event
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United States of America Patent
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Feb 13, 2018
Issued Date -
N/A
app pub date -
Feb 9, 2016
filing date -
Feb 9, 2015
priority date (Note) -
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Abstract
A circuit includes a driver circuit having a high side switch device and a low side switch device coupled to a load voltage node and a motor winding output. A controller operates the high side switch device and the low side switch device. The controller operates in a normal mode to supply current to the motor winding output for driving a motor winding when an external power supply is available to supply the load voltage node. In response to detecting a loss of the external power supply, the controller operates the high side switch device and the low side switch device in a boost mode to utilize a back electromotive force (BEMF) voltage from the motor winding to supply current to the load voltage node.
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