Power Factor Correction Circuit Voltage Adaptation
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Solution Overview
Problem
Power factor correction (PFC) circuits in consumer electronics face increased maximum power consumption due to varying commercial AC voltages, leading to inefficiencies and radiation noise, especially when high-amplitude AC voltages are encountered.
Innovation Solution
A control circuit for a PFC circuit that includes an input voltage detection terminal, error amplification circuits, a multiplying/dividing circuit, and a driving circuit to adjust the switching transistor's operation based on detected voltage and current, ensuring phase matching and reducing power consumption by stepwise adjustment of voltage levels and feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the PFC circuit operates without voltage adaptation, then the circuit structure remains simple, but the maximum power consumption increases in proportion to the square of the input voltage
Solution Approach 1:
The patent implements dynamic adaptation of the control circuit to varying input voltages. The control circuit modifies its operating parameters based on the detected input voltage level, transitioning from a static design to a dynamic one that optimizes power consumption across different voltage conditions while maintaining manageable circuit complexity through systematic design approaches.
Solution Approach 2:
The patent changes key operating parameters of the PFC circuit based on input voltage levels. By detecting the input voltage and adjusting control parameters accordingly, the circuit adapts its behavior to maintain efficient operation across the full voltage range (85V-265V), preventing power consumption from scaling with the square of voltage.
2Use of energy by moving object
If the PFC circuit is designed for maximum voltage, then power consumption is controlled, but the circuit cannot efficiently handle voltage fluctuations and lower voltage ranges
Solution Approach 1:
The control circuit dynamically adjusts its operation based on the actual input voltage level. Rather than being optimized for a single maximum voltage, the circuit continuously adapts its parameters to match the current voltage condition, enabling efficient operation across the entire specified voltage range from 85V to 265V.
Solution Approach 2:
The PFC circuit is designed with universal adaptability to handle multiple voltage conditions. The control circuit provides multi-functional capability by detecting input voltage levels and adjusting operation accordingly, making the circuit effective across diverse voltage environments rather than being specialized for one condition.
3Duration of action of stationary object
If high-amplitude AC voltages are processed without adaptation, then the circuit operates continuously, but radiation noise and network loss increase
Solution Approach 1:
The patent implements feedback control where the control circuit monitors input voltage levels and adjusts its operation accordingly. This feedback mechanism allows the circuit to optimize its switching and conduction characteristics based on actual voltage conditions, reducing harmful effects like radiation noise and network loss during continuous operation at high voltage amplitudes.
Data Source
AI summary
A first error amplification circuit amplifies a difference between a predetermined reference voltage and a first detection voltage that corresponds to the output voltage of a DC/DC converter, so as to generate a second voltage. A voltage level judgment circuit generates a third voltage having a discrete level that corresponds to the amplitude of a first voltage. A multiplying/dividing circuit multiplies the first voltage by the second voltage, and divides the resulting product by the third voltage, so as to generate a fourth voltage. A comparator compares the fourth voltage with a second detection voltage that corresponds to a current that flows through a switching transistor included in the DC/DC comparator. A driving circuit turns on the switching transistor for each predetermined period, and turns off the switching transistor according to the output of the comparator every time the second detection voltage becomes higher than the fourth voltage.