Television Power Supply Driving Device with LLC Resonance Architecture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current large-size LED TV power supply systems are complex, costly, and inefficient due to separate standby circuits, which hinder miniaturization and heat dissipation.
Innovation Solution
A television power supply driving device utilizing both a main and auxiliary power supply with LLC architecture, eliminating the separate standby circuit, where the power board includes a PFC circuit, an auxiliary power supply with an LLC resonance module, and a main power supply with a secondary LLC resonance module and synchronous rectifier module, allowing for efficient power conversion and controlled standby states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate standby circuit is used in traditional power supply systems, then the TV can enter standby mode, but the system becomes complicated with more devices and higher cost
Solution Approach 1:
The patent merges the standby circuit functionality into the main power supply circuit by using the same PFC circuit and controller. The controller can switch between different operating modes (standby and full power) by adjusting the PWM duty cycle, eliminating the need for a separate standby circuit and reducing system complexity.
Solution Approach 2:
The power supply circuit is designed to perform multiple functions: it can operate in standby mode to provide minimal power for keeping the TV in sleep mode, and in full power mode for normal operation. The same PFC circuit and controller handle both modes, making the power supply system universal and multi-functional.
2Adaptability or versatility
If a separate standby circuit is used, then standby functionality is provided, but the PCB area occupied increases
Solution Approach 1:
The standby circuit functionality is merged into the main power supply circuit, allowing both standby and full power operations to share the same PCB components including the PFC circuit, controller, and power transformer. This significantly reduces the PCB area required compared to having separate dedicated circuits for standby and main power.
3Device complexity
If flyback circuit is used to power the mainboard and eliminate standby circuit, then device complexity is reduced, but power efficiency decreases and heat sink becomes larger
Solution Approach 1:
The patent uses PFC (Power Factor Correction) technology to change the operating parameters of the power supply circuit, improving power efficiency by correcting the power factor and reducing harmonic distortion. The controller adjusts the switching frequency and duty cycle to optimize efficiency across different load conditions, avoiding the efficiency losses associated with traditional flyback circuits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution simplifies the power supply architecture, enhances power efficiency, and improves heat dissipation by eliminating the need for a separate standby circuit, while maintaining low standby power consumption and flexibility in power supply design.
Implementation Method 1
the PFC circuit outputs a PFC voltage to the first LLC resonance module and the second LLC resonance module
Implementation Method 2
the first LLC resonance module converts the PFC voltage into a first voltage and a second voltage according to a first control signal
Implementation Method 3
the second LLC resonance module converts the PFC voltage into a third voltage according to a second control signal
Implementation Method 4
the first voltage and the second voltage are then output to the mainboard and the secondary LLC control module for power respectively, after being rectified and filtered by the rectifying filter module
Implementation Method 5
outputs the third voltage to the backlight module for power after being synchronous rectified by the synchronous rectifier module
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure discloses television power driving device and television, standby control module controls power supply module to turn on resonance control module and PFC circuit successively when receiving power-on signal, PFC circuit outputs PFC voltage to first and second LLC resonance modules, first LLC resonance module converts PFC voltage into first voltage and second voltage according to first control signal, outputs respectively to mainboard and secondary LLC control module for power, after being rectified and filtered by rectifying filter module. Second LLC resonance module converts PFC voltage to third voltage according to second control signal, outputs to backlight module for power after synchronous rectified by synchronous rectifier module; standby control module controls power supply module to shut down PFC circuit to stop outputting PFC voltage, when receiving standby signal, making resonance control module enter standby state, simplifying power supply architecture and avoiding limiting power efficiency or heat dissipation.