Data storage device for forcibly discharging residual voltage, method operating the same, and data processing system including the same

• US 9,164,562 B2
• Filed: 09/25/2014
• Issued: 10/20/2015
• Est. Priority Date: 10/24/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Shim, In Bo
• Primary Examiner(s): Nguyen, Viet Q
• Application Number:
  US14/496,586
• Publication Number:
  US 20150121093A1
• Time in Patent Office: 390 Days
• Field of Search: 365/228, 365/185.25, 361/93.9, 361/89, 307/126, 307/52, 307/62
• US Class Current: 1/1
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: G06F 1/266 Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
• CPC Class Codes: G06F 1/30 Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations for resetting only G06F1/24

Abstract

A data storage device includes a voltage supply control circuit configured to receive an external voltage, generate different voltages from the external voltage, and supply the different voltages to loads, respectively, through voltage supply lines, respectively and a discharge control circuit configured to discharge residual voltages from the voltage supply lines in response to a control signal and the external voltage, the discharge control circuit configured to discharge the residual voltages in an order of a highest residual voltage to a lowest residual voltage.

Claims

1. A data storage device comprising:

a voltage supply control circuit configured to receive an external voltage, generate different voltages from the external voltage, and supply the different voltages to loads, respectively, through voltage supply lines, respectively; and

a discharge control circuit configured to discharge residual voltages from the voltage supply lines in response to a control signal and the external voltage, the discharge control circuit configured to discharge the residual voltages in an order of a highest residual voltage to a lowest residual voltage by linking the residual voltages to a common node in the discharge control circuit.

2. The data storage device of claim 1, wherein the discharge control circuit is configured to discharge the residual voltages through diodes, respectively, the diodes connected to the voltage supply lines, respectively.

3. The data storage device of claim 2, wherein at least one of the diodes is a diode-connected transistor.

4. The data storage device of claim 2, wherein at least one of the diodes is a two-terminal electronic component with asymmetric conductance.

5. The data storage device of claim 1, wherein

the voltage supply control circuit is configured to detect a change in the external voltage and output a cut-off signal;

and

the discharge control circuit is configured to detect the change in the external voltage, generate a detection signal, and generate the control signal based on the cut-off signal and the detection signal.

6. The data storage device of claim 1, wherein the discharge control circuit comprises:

a control signal generator configured to output the control signal based on the external voltage.

7. The data storage device of claim 1, wherein

the voltage supply control circuit is configured to detect a cut-off of the external voltage and output a cut-off signal, and

the discharge control circuit is configured to generate the control signal in response to the cut-off signal.

8. The data storage device of claim 1, wherein the discharge control circuit comprises:

diodes respectively connected to the voltage supply lines, the diodes connected to the common node; and

a switch circuit configured to connect the common node to a ground in response to the control signal.

9. The data storage device of claim 8, wherein the discharge control circuit further comprises:

current limiting circuits connected in parallel between the common node and the switch circuit.

10. The data storage device of claim 8, wherein at least one of the diodes is a diode-connected transistor.

11. The data storage device of claim 8, wherein at least one of the diodes is a two-terminal electronic component with asymmetric conductance.

12. The data storage device of claim 1, wherein

the voltage supply control circuit is configured to output respective state signals of the different voltages supplied to the loads, and

the discharge control circuit includes,

a control signal generator configured to detect a cut-off of the external voltage, generate a detection signal, and output the control signal based on the state signals and the detection signal;

diodes connected to the voltage supply lines, respectively, the diodes connected to the common node; and

a switch circuit configured to connect the common node to a ground in response to the control signal.

13. The data storage device of claim 12, wherein the discharge control circuit further comprises:

current limiting circuits connected in parallel between the common node and the switch circuit.

14. The data storage device of claim 12, wherein at least one of the diodes is a two-terminal electronic component with asymmetric conductance.

15. The data storage device of claim 1, wherein the data storage device is a solid state drive (SSD).

16. A data processing system comprising:

a data storage device;

a power source configured to supply an external voltage; and

a host configured to control an operation of the data storage device,

wherein the data storage device including;

a voltage supply control circuit configured to receive the external voltage, generate different voltages from the external voltage, and supply the different voltages to loads, respectively, through voltage supply lines, respectively; and

a discharge control circuit configured to discharge residual voltages from the voltage supply lines in response to a control signal and the external voltage, the discharge control circuit configured to discharge the residual voltages in an order of a highest residual voltage to a lowest residual voltage by linking the residual voltages to a common node in the discharge control circuit.

17. The data processing system of claim 16, wherein the discharge control circuit is configured to discharge the residual voltages through two-terminal electronic components with asymmetric conductance, respectively, the two-terminal electronic components being respectively connected to the voltage supply lines.

18. The data processing system of claim 16, wherein the discharge control circuit comprises:

a control signal generator configured to output the control signal based on the external voltage.

19. A method of discharging a voltage from a data storage device, the method comprising:

supplying different voltages to loads, respectively, based on an external voltage, the different voltages being supplied through voltage supply lines, respectively;

detecting a cut-off of the external voltage and generating a control signal; and

discharging residual voltages from the voltage supply lines in descending order of voltage level in response to the control signal by linking the residual voltages to a common node in the discharge control circuit.

20. The method of claim 19, wherein the discharging the residual voltages comprises:

discharging the residual voltages respectively through two-terminal electronic components with asymmetric conductance, the two-terminal electronic components being respectively connected to the voltage supply lines.