Display Power Supply Switching for Faster Standby Battery Charging
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Solution Overview
Problem
Existing power supplies for image display apparatuses are inefficient in charging batteries, particularly in stand-by modes where the display is turned off, as they do not optimize charging currents based on the display's on or off states.
Innovation Solution
A power supply system that includes a converter to output driving voltage, a first switch connected to a battery, and a second switch between the converter and the first switch, allowing for different charging paths and modes (static current and voltage) based on the display's state, with control signals from a signal processing device to manage charging efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single charging path is used for battery charging regardless of display state, then the power supply structure is simple, but the battery charging efficiency is low
Solution Approach 1:
The power supply is divided into two independent charging paths: a first charging path for when the display is on, and a second charging path for when the display is off. Each path has its own switching mechanism (first switch and second switch) that can be independently controlled to optimize charging efficiency for each display state without requiring a completely complex reconfiguration of the entire power supply system.
Solution Approach 2:
The charging path is dynamically switched between the first and second paths based on the display state. The controller monitors whether the display is on or off and automatically selects the appropriate charging path, making the system adaptive to different operating conditions and maximizing battery charging efficiency in each state.
2Speed
If high charging current is supplied to the battery, then the charging speed increases, but heat generation increases
Solution Approach 1:
Different charging current levels are applied locally based on the display state: when the display is on, a first charging current is supplied; when the display is off, a second charging current (higher than the first) is supplied. This localized adjustment of current magnitude allows the system to achieve faster charging when needed (display off) while maintaining acceptable heat levels during normal operation (display on).
Solution Approach 2:
The charging current parameter is dynamically changed based on the display state. The controller adjusts the magnitude of the charging current supplied to the battery according to whether the display is on or off, optimizing the balance between charging speed and heat generation by using appropriate current levels for each operational context.
Data Source
AI summary
Disclosed are a power supply and an image display apparatus including the same. According to an embodiment of the present disclosure, a power supply includes a converter to convert a level of input voltage and output display driving voltage; a first switch electrically connected to a battery; a driving driver to drive the first switch based on the input voltage; and a second switch connected between the first switch and the converter, and upon a charging mode of the battery, in the case of a stand-by mode in which the display is turned off, the first switch and the second switch are turned on to supply a third current generated by adding a first current which flows through the driving driver and a second current which flows through the converter and the second switch to the battery through the first switch. As a result, the battery can be efficiently charged in the stand-by mode.