Dual-Mode PFC Power Supply for THD-Compliant Multimedia Lighting
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Solution Overview
Problem
Compact multimedia devices face challenges in meeting total harmonic distortion (THD) standards for both multimedia and lighting functions due to differing power consumption requirements, leading to increased volume and cost of power supplies.
Innovation Solution
An electronic apparatus with a compact power supply that includes a transformation part, a power factor correction (PFC) part with a PFC circuit and control circuit, and a converter part, which adjusts power supply based on the device's operating mode through switches and monitoring circuits to meet THD standards efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply is designed to meet THD standards for both multimedia and lighting functions, then the THD compliance is improved, but the volume and cost of the power supply increase
Solution Approach 1:
The power supply dynamically switches between two operational modes: a first mode for multimedia functions with higher power consumption and a second mode for lighting functions with lower power consumption. This dynamic adaptation allows the power supply to meet different THD standards for different functions without being oversized for all conditions, thereby reducing overall volume while maintaining compliance.
Solution Approach 2:
The power supply changes its operational parameters based on the detected function type. When lighting function is detected, it transitions to a second operational state with adjusted power consumption parameters that satisfy lighting-specific THD standards (≤5W or ≤25W), whereas multimedia functions allow higher power consumption. This parameter adaptation enables compact design while meeting diverse regulatory requirements.
2Reliability
If the power supply is designed to meet THD standards for both multimedia and lighting functions, then the THD compliance is improved, but the cost of the power supply increases
Solution Approach 1:
The power supply dynamically switches between two operational modes: a first mode for multimedia functions with higher power consumption and a second mode for lighting functions with lower power consumption. This dynamic adaptation allows the power supply to meet different THD standards for different functions without being oversized for all conditions, thereby reducing overall volume while maintaining compliance.
Solution Approach 2:
The power supply changes its operational parameters based on the detected function type. When lighting function is detected, it transitions to a second operational state with adjusted power consumption parameters that satisfy lighting-specific THD standards (≤5W or ≤25W), whereas multimedia functions allow higher power consumption. This parameter adaptation enables compact design while meeting diverse regulatory requirements.
3Device complexity
If a single power supply design is used for both multimedia and lighting functions, then the device complexity is reduced, but the adaptability to different THD standards deteriorates
Solution Approach 1:
The power supply dynamically switches between two operational modes: a first mode for multimedia functions with higher power consumption and a second mode for lighting functions with lower power consumption. This dynamic adaptation allows the power supply to meet different THD standards for different functions without being oversized for all conditions, thereby reducing overall volume while maintaining compliance.
Solution Approach 2:
The power supply changes its operational parameters based on the detected function type. When lighting function is detected, it transitions to a second operational state with adjusted power consumption parameters that satisfy lighting-specific THD standards (≤5W or ≤25W), whereas multimedia functions allow higher power consumption. This parameter adaptation enables compact design while meeting diverse regulatory requirements.
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
The solution enables the electronic apparatus to satisfy THD standards under various conditions while minimizing size and cost, effectively managing power consumption for both multimedia and lighting functions.
Implementation Method 1
a transformation part configured to convert alternating current (AC) power into direct current (DC) power
Data Source
AI summary
The present disclosure provides apparatuses including a lighting function and a multimedia function, and control methods thereof. In some embodiments, an electronic apparatus includes a transformation part configured to convert alternating current (AC) power into direct current (DC) power, a power factor correction (PFC) part including a PFC circuit and a PFC control circuit, and a converter part configured to control a voltage output from the PFC part by using a transformer to supply power through an output terminal of the converter part, set a first switch of the converter part to a first state based on the electronic apparatus performing a multimedia function, and set the first switch to a second state based on the electronic apparatus performing a lighting function. The PFC part is configured to control the PFC control circuit, based on a state of the first switch.