Power Factor Correction Circuit Control for Power Saving Mode
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Solution Overview
Problem
Conventional power supply apparatuses with power factor correction circuits consume unnecessary power when in power saving mode, leading to potential overheating and malfunction due to peak current issues when the power factor correction circuit is not operating.
Innovation Solution
A power supply apparatus with a power factor correction circuit, a voltage converter, and a power control unit that outputs signals to reliably start the power factor correction circuit and voltage converter, allowing the voltage converter to remain on while the power factor correction circuit is turned off in power saving mode, and vice versa, ensuring safe and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the power factor correction circuit is turned off in power saving mode, then power consumption is reduced, but peak current increases and harmonic frequency is generated
Solution Approach 1:
The control circuit activates the power factor correction circuit before turning on the voltage converter, ensuring the PFC circuit is already operating when the converter starts. This preliminary action prevents peak current and harmonic frequency issues while allowing the PFC circuit to be turned off during power saving mode.
Solution Approach 2:
The system dynamically adjusts the operating state of the power factor correction circuit based on the operational mode. The PFC circuit is turned off during power saving mode to reduce power consumption, and turned on before voltage converter operation to prevent harmful electrical characteristics.
2Loss of energy
If the voltage converter is turned on while the power factor correction circuit is not operating, then power consumption is reduced, but current greater than rated current flows through primary side circuit
Solution Approach 1:
The control circuit ensures the power factor correction circuit is activated before the voltage converter. This preliminary activation of the PFC circuit prevents excessive current flow when the converter operates, while still allowing both to be off during power saving mode to reduce power consumption.
3Reliability
If the power factor correction circuit is always on, then power factor is corrected and current waveform is sinusoidal, but power consumption increases unnecessarily in power saving mode
Solution Approach 1:
The system dynamically controls the power factor correction circuit based on operational needs. The PFC circuit is turned off during power saving mode to reduce power consumption, and turned on when the voltage converter operates to maintain proper power factor correction and current waveform.
Solution Approach 2:
The power factor correction function is extracted as a separate controllable circuit that can be independently activated or deactivated. This allows the PFC circuit to be turned off during power saving mode and turned on only when needed, separating the power correction function from continuous operation.
Data Source
AI summary
A power supply apparatus of the present invention has a power factor correction circuit that corrects a power factor; a voltage converter connected to a secondary side of the power factor correction circuit; a power control unit that outputs a first signal for turning the power factor correction circuit on, and outputs a second signal for turning the voltage converter on; and a signal output unit that, in accordance with having being inputted with the first signal and the second signal, outputs a signal for turning the voltage converter on.