Power management method for built-in camera

Abstract

The invention discloses a method for managing power of built-in camera which comprises steps of: switch setting step, controlling the on and off of system power and camera general serial bus interface via the high / low level output from main board chip; power control step, controlling the level output from the main board chip output interface for providing power when loading camera application. The invention modifies the hardware circuit of the built-in camera by employing GPIO to control power of USB plugging components in the USB interface connected with the camera, and realizing the control of camera power via controlling GPIO, thereby prolonging cell endurance.

Description

technical field [0001] The invention relates to a power management method of a universal serial bus device, in particular to a power management method of a built-in camera. Background technique [0002] With the improvement of the integration level of USB (Universal Serial Bus, universal serial bus) interface passive response universal serial bus devices, for example, taking a camera as an example, more and more notebook computers provide a built-in camera function. The built-in camera will increase the power consumption of the system. There are two main reasons: First, most of the built-in cameras are USB (1.1 / 2.0) interfaces, which consume power even when the camera is not working. Second, because after the system inserts the USB device, the CPU will leave the low power consumption state; therefore, after the notebook has a built-in camera, as long as the notebook is turned on, the USB device will always exist from the perspective of the system, and in this case the CPU wi...

AI Technical Summary

Problems solved by technology

The built-in camera will increase the power consumption of the system. There are two main reasons: First, most of the built-in cameras are USB (1.1 / 2.0) interfaces, which consume power even when the camera is not working.

Second, because after the system inserts the USB device, the CPU will leave the low power consumption state; therefore, after the notebook has a built-in camera, as long as the notebook is turned on, the USB device will always exist from the perspective of the system. In this case, the CPU will never enters a low-power state, resulting in an increase in power consumption

The built-in camera needs to be powered from the USB port of the notebook, so there is no way to control its own power switch according to the needs. For example, after the camera is built in the power-on state, the user cannot reduce the power consumption of the entire system by plugging and unplugging the camera.

Using hardware to realize automatic camera control will increase the cost of the notebook, and will affect the hardware design of the entire notebook, making it very difficult to implement

It is unfriendly in terms of user experience, for example: if the user forgets to turn on the power of the camera when starting up, the system will report an error when running the camera-related software; if the firmware (Firmware) turns on the camera by default when starting up, but the user does not use the camera-related software, which will increase the power consumption of the system and affect the battery life

Images