Power management method for input device

• US 8,041,974 B2
• Filed: 01/12/2009
• Issued: 10/18/2011
• Est. Priority Date: 10/17/2008
• Status: Expired due to Fees

• Current Assignee: Kinpo Electronics Incorporated (Cal-Comp Electronics Public Company Limited)
• Original Assignee: Kinpo Electronics Incorporated (Cal-Comp Electronics Public Company Limited)
• Inventors: Lin, Kuo-Hung, Chen, Chun-Yi
• Primary Examiner(s): Zaman; Faisal M
• Application Number:
  US12/352,249
• Publication Number:
  US 20100100755A1
• Time in Patent Office: 1,009 Days
• Field of Search: 713300-340
• US Class Current: 713/323
• CPC Class Codes: G06F 1/3215 Monitoring of peripheral devices

Abstract

A power management method for an input device is provided, which includes the following steps: starting to count time and recording a trigger time of the input device after the input device enters a light-sleep mode; and dynamically updating a deep-sleep start time according to the trigger time. When the input device is idle over a standby time, the input device would enter the light-sleep mode and record the trigger time that the input device is restored from the light-sleep mode to an operation mode by a user operating the input device. The method dynamically updates the deep-sleep start time according to the recorded trigger time, and thus better power saving efficiency is achieved.

Claims

1. A power management method for an input device, comprising:

starting to count time and recording a trigger time of the input device after the input device enters a light-sleep mode, wherein the input device enters the light-sleep mode when the input device is idle over a fixed time;

updating a deep-sleep start time according to the trigger time; and

entering a deep-sleep mode when the input device is idle over the deep-sleep start time,

wherein the step of recording the trigger time further comprises;

activating a timer to obtain the trigger time after entering the light-sleep mode;

setting a detection period between the fixed time and an upper limit value, and dividing the detection period into a plurality of time intervals respectively corresponding to a plurality of index values; and

recording one of the index values according to one of the time intervals that corresponds to the trigger time.

2. The power management method as claimed in claim 1, wherein the step of updating the deep-sleep start time according to the trigger time further comprises:

based on a recording sequence, updating an oldest index record value of N index record values with one of the index values that corresponds to the trigger time, wherein N is a positive integer; and

updating the deep-sleep start time according to the index record values.

3. The power management method as claimed in claim 2, wherein N is equal to 8.

4. The power management method as claimed in claim 2, wherein the step of updating the deep-sleep start time according to the index record values further comprises:

calculating an average index value based on an accumulated value of the index record values; and

updating the sleep start time according to the average index value, the length of the time interval, and an intermediate value of the time interval.

5. The power management method as claimed in claim 4, wherein the step of updating the deep-sleep start time according to the average index value, the length of the time interval, and the intermediate value of the time interval further comprises:

updating the deep-sleep start time with a sum of a product of the average index value and the time interval and the intermediate value of the time interval.

6. The power management method as claimed in claim 2, wherein the step of updating the index record values further comprises:

stopping counting time and recording a weighted index value according to the deep-sleep start time, and updating the oldest index record value with the weighted index value, when the input device is idle and enters the deep-sleep mode, wherein the weighted index value is larger than one of the index values which is corresponding to the deep-sleep start time.

7. The power management method as claimed in claim 1, wherein the trigger time is an interval time that the input device is restored from a light-sleep mode to an operation mode by a user operating the input device.

8. The power management method as claimed in claim 1, wherein the input device is a wireless mouse, a wired mouse or a keyboard.