Display Standby Power Management for USB Charging
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Solution Overview
Problem
Displaying apparatuses unnecessarily consume power when charging external devices in standby mode due to the need to turn on the entire device to supply power through USB connectors, leading to inefficient energy use.
Innovation Solution
Implementing a method to determine if an external device is chargeable using standby power through a USB connector, allowing only the necessary components to be activated for charging, and using main power through the VBUS line, while also displaying the charge state of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the displaying apparatus is turned ON to supply power to the USB connector for charging an external device, then the external device can be charged, but the displaying apparatus consumes unnecessary power when in standby mode
Solution Approach 1:
The power supply system is segmented into two independent paths: one for the displaying apparatus main body and another for the USB connector charging function. The power supply unit can selectively activate only the USB connector power path when an external device is detected, while keeping the main displaying apparatus in standby mode, thus achieving partial power supply isolation.
Solution Approach 2:
The controller detects the connection of the external device to the USB connector in advance (before full power-on) and activates the power supply unit specifically for the USB connector. This preliminary detection and selective activation prevents unnecessary full system power consumption while ensuring the charging function is available when needed.
2Reliability
If the displaying apparatus is turned ON to enable USB connector power supply, then charging can be performed, but the system complexity increases due to additional power management requirements
Solution Approach 1:
The power supply unit for the USB connector is merged with the existing power supply architecture of the displaying apparatus. The controller integrates the detection of external device connection and the activation of the power supply unit into a unified control logic, reducing the need for separate independent power management systems while maintaining the ability to selectively power the USB connector.
3Use of energy by moving object
If standby power is used to detect external device connection, then power consumption is reduced, but the detection capability may be insufficient
Solution Approach 1:
The detection function is optimized for the specific local condition of USB connector connection detection. The controller uses the standby power path specifically for detecting whether an external device is connected to the USB connector, rather than using the main power system. This localized detection approach uses minimal power while maintaining sufficient accuracy for the specific detection task.
Data Source
AI summary
A method for charging an external device and a display using the method are provided. The method includes, determining whether the external device is chargeable and connected to the display through a connector when the displaying apparatus is in a standby mode; and if it is determined that the external device is chargeable and connected, charging the external device through the connector in the standby mode. The display includes a power supply that supplies standby power or main power; a checker which determines, in a standby mode, whether an external device is connected and chargeable; and a controller. The controller controls the power supply to output standby power while the checker determines whether the external device is connected and is a chargeable device, and if the external device is connected and chargeable, controls the power supply to output main power to charge the external device.