Power Supply Standby Mode Control via Shared Primary Coil
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Solution Overview
Problem
Conventional display power supplies require an additional standby power supply, such as a flyback converter, to manage standby mode, leading to increased size and manufacturing costs due to the need for extra components.
Innovation Solution
A power supply system that utilizes a switching circuit to generate both operating and standby voltages without an additional standby power supply, employing a rectifier, power factor correction circuit, and a switching module to control the voltage levels and current flow, allowing the power supply to manage standby mode efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional standby power supply (flyback converter) is used to control standby mode, then the standby mode can be effectively managed, but the device size and manufacturing cost increase
Solution Approach 1:
The patent combines the standby power supply function with the main power supply circuit by using the same primary coil for both the LLC converter and the flyback converter. The primary coil serves dual purposes: generating operating voltage through the LLC converter and generating standby voltage through the flyback converter, thereby eliminating the need for a separate standby power supply and reducing overall device complexity
Solution Approach 2:
The primary coil is designed to perform multiple functions simultaneously - it acts as both the main transformer for the LLC converter and the transformer for the flyback converter. This multi-functional design allows a single component to replace what would traditionally require separate dedicated components, reducing the overall number of parts while maintaining reliable standby mode control
2Reliability
If an additional standby power supply (flyback converter) is used to control standby mode, then the standby mode can be effectively managed, but the manufacturing cost increases
Solution Approach 1:
The patent combines the standby power supply function with the main power supply circuit by using the same primary coil for both the LLC converter and the flyback converter. The primary coil serves dual purposes: generating operating voltage through the LLC converter and generating standby voltage through the flyback converter, thereby eliminating the need for a separate standby power supply and reducing overall device complexity
Solution Approach 2:
The primary coil is designed to perform multiple functions simultaneously - it acts as both the main transformer for the LLC converter and the transformer for the flyback converter. This multi-functional design allows a single component to replace what would traditionally require separate dedicated components, reducing the overall number of parts while maintaining reliable standby mode control
3Power
If the switching circuit converts AC power only into operating voltage, then the voltage level is appropriate for switching mode elements, but an additional standby power supply is required
Solution Approach 1:
The patent combines the standby power supply function with the main power supply circuit by using the same primary coil for both the LLC converter and the flyback converter. The primary coil serves dual purposes: generating operating voltage through the LLC converter and generating standby voltage through the flyback converter, thereby eliminating the need for a separate standby power supply and reducing overall device complexity
Solution Approach 2:
The patent segments the power conversion functions by using two separate converters (LLC and flyback) that share a common primary coil. The LLC converter handles operating voltage conversion while the flyback converter handles standby voltage conversion, allowing each converter to be optimized for its specific function while sharing common components to reduce overall complexity
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 reduces the number of components needed, downsizes the display apparatus, and lowers manufacturing costs by eliminating the requirement for a separate standby power supply, while maintaining effective voltage control for both standby and normal modes.
Implementation Method 1
a rectifier configured to rectify a current of alternating current (AC) power input as input power, into a direct current (DC)
Implementation Method 2
a switching circuit configured to convert the DC voltage output by the PFC circuit into a predetermined operating voltage and a standby voltage
Data Source
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AI summary
A power supply, a power control method and a display apparatus having the same, for controlling a standby mode, are provided. The power supply of an electronic apparatus includes: a rectifier configured to rectify a current of alternating current (AC) power input as input power, into a direct current (DC); a power factor correction (PFC) circuit configured to correct a power factor of a DC voltage converted by the rectifier; a switching circuit configured to convert the DC voltage output by the PFC circuit into a predetermined operating voltage and a standby voltage and supply the operating voltage and the standby voltage to the electronic apparatus; and an output controller configured to control the PFC circuit and the switching circuit in order to convert the DC voltage into the predetermined operating voltage and standby voltage by the switching circuit and to supply the operating voltage and the standby voltage to the electronic apparatus.