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US 10,374,528 B2Granted
Efficient energy recovery in disk drive during power loss
AssigneeSeagate Technology LLC
InventorsBinh Kim Lieu, Mark Lowell Elliott, Raye A. Sosseh
Life of this patent
Estimating the term…
Abstract
A back electromotive force of a rotating motor is converted into a voltage for a load by driving, in accordance with a duty cycle, at least one switching circuit that couples the back electromotive force to a load through a rectifying circuit. An error signal is generated that is a difference between the load voltage and a reference voltage. The duty cycle is controlled as a function of the error signal to cause the load voltage to approach the reference voltage.
Claims20
A method, comprising:
- detecting power loss to a rotating motor of a storage device;
- in response to detecting the power loss, performing a shut-down procedure comprising:
- coupling a back electromotive force of the rotating motor to a load using a switching circuit, the load comprising components of the storage device;
- driving the switching circuit according to a duty cycle
- generating an error signal that is a difference between the back electromotive force and a reference voltage;
- and
- controlling the duty cycle as a function of the error signal to cause the back electromotive force to approach the reference voltage.
4 more elements
A power back-up system for a storage device, comprising:
- circuitry configured to implement a shut-down process in response to loss of power, the shut-down process including one or more shut-down tasks;
- at least one rectifier;
- at least one switching circuit, the at least one switching circuit configured to couple a back electromotive force from a rotating motor to at least one component of the storage device through the at least one rectifier;
- a pulse width modulator configured to drive the switching circuit according to a duty cycle;
- and
- a control system comprising:
- error circuitry configured to determine a difference between the back electromotive force and a reference voltage;
- and
- a feedback controller configured to regulate the duty cycle as a function of the error signal to cause the back electromotive force to approach the reference voltage.
6 more elements
A memory system, comprising:
- a disk drive comprising a motor;
- a non-volatile cache;
- a power back-up system, comprising:
- circuitry configured to implement a shut-down process in response to loss of power, the shut-down process including one or more shut-down tasks;
- at least one rectifier;
- at least one switching circuit, the at least one switching circuit configured to couple a back electromotive force from a rotating motor to at least one component of the memory system through the at least one rectifier;
- a pulse width modulator configured to drive the switching circuit according to a duty cycle;
- and
- a control system comprising:
- error circuitry configured to determine a difference between the back electromotive force and a reference voltage;
- and
- a feedback controller configured to regulate the duty cycle as a function of the error signal to cause the back electromotive force to approach the reference voltage.
9 more elements
Dependencies are inferred from the claim text.