PFC Voltage Detection Switching for Low Standby Power
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Solution Overview
Problem
Existing power factor correction circuits face challenges in achieving low standby power consumption and maintaining efficient power factor correction, particularly due to residual power consumption in voltage detection circuits during standby modes.
Innovation Solution
The implementation of voltage dividing resistors and switches within the controller to manage power consumption by selectively activating voltage detection circuits only when necessary, combined with an arithmetic circuit to adjust the offset voltage for optimal power factor correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If voltage detection circuits remain active during standby mode to maintain power factor correction capability, then power factor correction efficiency is maintained, but standby power consumption increases
Solution Approach 1:
The patent applies dynamics by making the voltage detection circuit's operational state changeable between active and standby modes. The controller dynamically switches the detection circuit on during normal operation and off during standby mode, allowing the system to adapt its power consumption characteristics to different operational requirements while maintaining power factor correction capability when needed.
Solution Approach 2:
The patent implements periodic action by using pulse-width modulation (PWM) signals to periodically activate the voltage detection circuit even during normal operation. The controller outputs PWM signals to the detection circuit, enabling it to function in a periodic manner rather than continuously, which reduces average power consumption while maintaining effective voltage detection capability.
2Measurement precision
If voltage dividing resistors are always connected to detect voltage for power factor correction, then voltage detection accuracy is maintained, but power consumption increases
Solution Approach 1:
The patent makes the voltage dividing resistors dynamically connectable and disconnectable from the voltage source. The controller switches these resistors into the circuit during normal operation for accurate voltage detection and disconnects them during standby mode to eliminate their power consumption, thus balancing measurement precision requirements with energy efficiency.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the voltage dividing resistors to be quickly connectable when voltage detection is needed. The controller can rapidly switch these resistors into position before actual voltage detection begins, ensuring measurement accuracy is immediately available when required without maintaining continuous connection.
3Productivity
If offset voltage is continuously adjusted to optimize power factor correction, then power factor correction efficiency is maximized, but control complexity increases
Solution Approach 1:
The patent implements feedback by using the detected voltage information to automatically adjust the offset voltage in real-time. The controller monitors the voltage detection results and uses this feedback to dynamically adjust the offset voltage, optimizing power factor correction efficiency automatically without requiring complex manual control mechanisms.
Solution Approach 2:
The patent applies self-service by enabling the system to automatically optimize its own power factor correction performance through autonomous offset voltage adjustment. The controller independently manages the offset voltage based on detected voltage conditions, eliminating the need for external intervention or complex control systems while maintaining high correction efficiency.
Data Source
AI summary
A power factor correction circuit including a DC/DC converter includes: at least one selected from the group of first voltage dividing resistors and a first switch connected to an application end of a first voltage with a full-wave rectified waveform, and second voltage dividing resistors and a second switch connected to an application end of an output voltage of the DC/DC converter; and a controller configured to control the power factor correction circuit, wherein an on-off operation of at least one selected from the group of the first switch and the second switch is controlled based on a control signal which is input to the controller from outside to switch between a normal state and a standby state.