US 12,033,663 B2
Current sensing circuit and hard disk drive including same
Ezio Galbiati, Agnadello (IT)
Assigned to STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed by STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed on Jun. 29, 2023, as Appl. No. 18/343,868.
Claims priority of application No. 102022000016119 (IT), filed on Jul. 29, 2022.
Prior Publication US 2024/0038268 A1, Feb. 1, 2024
Int. Cl. G11B 19/28 (2006.01); G11B 21/02 (2006.01); G11B 25/04 (2006.01); G11B 27/36 (2006.01)
CPC G11B 21/025 (2013.01) [G11B 25/043 (2013.01); G11B 27/36 (2013.01); G11B 2220/2516 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A circuit, comprising:
a first level shifter having a first input configured to be coupled to a first winding of a motor and a second input configured to be coupled to a motor voltage node;
a second level shifter having a first input configured to be coupled to a second winding of the motor and a second input configured to be coupled to the motor voltage node;
a third level shifter having a first input configured to be coupled to a third winding of the motor and a second input configured to be coupled to the motor voltage node;
a first flip-flop having an input coupled to an output of the first level shifter, the first flip-flop also having an output configured to carry a signal indicative of a direction current flow through the first winding;
a second flip-flop having an input coupled to an output of the second level shifter, the second flip-flop also having an output configured to carry a signal indicative of a direction current flow through the second winding; and
a third flip-flop having an input coupled to an output of the third level shifter, the third flip-flop also having an output configured to carry a signal indicative of a direction current flow through the third winding.