Switching Power Supply PFC Disable for Low Load Efficiency
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Solution Overview
Problem
Switching power supplies with active power factor correction circuitry consume a significant amount of power, which is unnecessary at low operating modes, as regulations for power factor correction typically apply only above a minimum power draw threshold.
Innovation Solution
The system disables power factor correction circuitry at low operating points by using bypass circuitry to allow the rectification circuitry to directly drive the energy storage element, reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power factor correction circuitry is kept active, then power factor compliance is maintained, but power consumption increases unnecessarily at low operating points
Solution Approach 1:
The power factor correction circuitry is made dynamically controllable through an enable signal that switches it between active and inactive states based on operating conditions. The control circuitry monitors power draw levels and activates or deactivates the PFC circuit accordingly, allowing the system to adapt its power factor correction behavior to match actual operating requirements and minimize energy consumption when compliance thresholds are not exceeded.
2Loss of energy
If power factor correction circuitry is disabled at low operating points, then power consumption is reduced, but power factor compliance may be violated
Solution Approach 1:
The control circuitry implements a feedback mechanism that monitors the power draw level and uses this information to make intelligent decisions about PFC circuit activation. By continuously sensing operating conditions and comparing them against compliance thresholds, the system ensures that power factor correction is activated only when necessary to meet regulatory requirements, thereby maintaining compliance adaptability while minimizing energy consumption.
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 approach saves power by disabling power factor correction when it is not required, thereby reducing energy wastage and maintaining compliance with regulations only when necessary.
Implementation Method 1
bypass circuitry to allow the rectification circuitry to directly drive the energy storage element
Data Source
AI summary
A switching power supply includes power factor correction circuitry and a standby output converter. One or more loads may be coupled to one or more outputs of the switching power supply. The switching power supply is configured to disable the power factor correction circuitry under some load conditions and to enable the power factor correction circuitry under other load conditions. As a consequence, power that would have been drawn by the power factor correction circuitry is conserved when the power factor correction circuitry is disabled.