Power Factor Correction Circuitry for Standby Efficiency
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Solution Overview
Problem
Consumer electronics power supplies face challenges in meeting efficiency standards during standby mode, particularly in devices with multiple power supplies, as existing solutions require additional components and space, increasing costs and size.
Innovation Solution
A power supply system that operates in both normal and auxiliary modes, where one power converter and the power factor correction circuit are deactivated during auxiliary mode, allowing the remaining converter to perform power factor correction, thereby eliminating the need for a dedicated auxiliary supply and optimizing space and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a dedicated auxiliary mode power supply is provided to meet efficiency requirements during standby mode, then power consumption during auxiliary power mode is reduced, but component cost and device area increase
Solution Approach 1:
The patent makes the power factor correction circuitry multi-functional by enabling it to perform both its traditional power factor correction function during normal operation and an auxiliary power supply function during standby mode. The circuitry is designed to source auxiliary power when the main power supply is deactivated, thus serving dual purposes and eliminating the need for a separate dedicated auxiliary power supply circuit.
Solution Approach 2:
The patent merges the auxiliary power supply function with the existing power factor correction circuitry. Instead of providing a separate dedicated auxiliary power supply, the solution combines both functions into a single integrated circuit that can operate in different modes, thereby reducing component count, device area, and cost while meeting efficiency requirements.
2Power
If multiple power supplies are provided to deliver power to various loads, then power delivery capability is improved, but meeting standby power mode requirements becomes difficult
Solution Approach 1:
The patent implements dynamic operation of power supply circuits by enabling the power factor correction circuitry to switch between different operational modes. During normal operation, the circuit performs power factor correction; during standby mode, it transitions to providing auxiliary power. This dynamic reconfiguration allows the system to meet both high power delivery requirements and low standby consumption requirements.
Solution Approach 2:
The patent changes the operational parameters of the power factor correction circuitry based on system state. By modifying how the circuit operates - switching between power factor correction mode and auxiliary power supply mode - the system can accommodate varying power delivery needs while maintaining efficiency during standby, thus resolving the contradiction between multiple power supplies and standby power consumption.
Data Source
AI summary
A method of operating a power supply including first and second power converters connected to a load and a power factor correction circuit connected to the power converters includes operating the power supply in a normal power mode such that: the first and second power converters and the power factor correction circuit are active, the first and second power converters each drive their respective load, and the power factor correction circuit performs power factor correction for each circuit formed by the first and second power converters and their respective load, and operating the power supply in an auxiliary power mode such that: both the first power converter and the power factor correction circuit are deactivated and the second power converter is active, the second power converter drives its load, and the second power converter performs power factor correction for a circuit formed between the second power converter and its load.