Power Factor Correction Circuit Over-Voltage Detection
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Solution Overview
Problem
Existing power factor correction circuits rely on resistor elements for over-voltage detection, which can lead to inaccuracies due to resistor damage and increased power consumption, and may cause bulk capacitor explosions, resulting in noise and increased production costs.
Innovation Solution
A power factor correction circuit that uses an inductor, a power switch, an auxiliary inductor, and a controller to detect over-voltage by generating source and sink currents, determining over-voltage without direct output voltage detection, thereby reducing power consumption and eliminating the need for additional resistor elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistor element is used for over-voltage detection, then the output voltage can be monitored, but power consumption increases and the circuit becomes more complex
Solution Approach 1:
The patent extracts the over-voltage detection function from the traditional resistor-based feedback circuit and implements it independently using an auxiliary inductor and current comparison mechanism. This separates the detection function from the power-consuming resistor element, allowing accurate over-voltage detection without the continuous power consumption penalty of resistor-based voltage division.
Solution Approach 2:
The patent introduces an auxiliary inductor as an intermediary element that couples to the main inductor. This auxiliary inductor generates proportional voltages that serve as intermediaries for over-voltage detection, replacing the direct resistor-based voltage sampling approach and enabling detection without continuous power dissipation.
2Reliability
If additional resistor elements are connected to the output terminal to prevent over-voltage, then over-voltage protection is improved, but production costs increase due to additional parts and power consumption
Solution Approach 1:
The auxiliary inductor serves multiple functions: it enables over-voltage detection, provides feedback signal generation, and works within the existing power factor correction circuit topology. This multi-functionality eliminates the need for separate resistor elements dedicated solely to protection, reducing overall circuit complexity while maintaining protection capabilities.
Solution Approach 2:
The patent merges the over-voltage detection function with the existing inductor-based power factor correction mechanism. By using the auxiliary inductor that couples to the main inductor, the detection function is combined with the energy storage and transfer function, eliminating the need for separate resistor-based protection circuits.
3Stability of the object's composition
If a bulk capacitor with large capacitance is used to store output voltage, then output voltage stability is improved, but the risk of capacitor explosion due to over-voltage increases
Solution Approach 1:
The patent implements preliminary over-voltage detection and protection action before the bulk capacitor can be damaged. The auxiliary inductor continuously monitors for over-voltage conditions and triggers protection mechanisms in advance, preventing the harmful over-voltage from reaching levels that would cause capacitor explosion while maintaining normal capacitor operation for voltage stability.
4Ease of operation
If resistor elements are used for voltage division to control feedback voltage, then the feedback voltage can be maintained within suitable range, but the circuit becomes more complex and power consumption increases
Solution Approach 1:
The patent replaces the passive resistor-based voltage division mechanism with an active inductor-based voltage generation mechanism. The auxiliary inductor generates the feedback voltage through electromagnetic induction from the main inductor, substituting the resistor-based mechanical voltage division with an electromagnetic field-based approach that consumes less power while maintaining feedback control capability.
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
The solution effectively determines over-voltage without direct output voltage detection, reducing power consumption and preventing capacitor explosions, while maintaining accurate voltage control and reducing production costs.
Implementation Method 1
The auxiliary inductor is coupled to the inductor with a predetermined turn ratio
Data Source
AI summary
The present invention relates to a power factor correction circuit and a driving method thereof.The power factor correction circuit includes a power switch controlling an inductor current flowing in an inductor, an auxiliary inductor coupled to the inductor with a predetermined turn ratio, and a power factor correction controller controlling output power by controlling a switching operation of the power switch.The power factor correction controller determines whether or not an output voltage of the output power is an over-voltage by using the sum of a source current and a sink current that control a zero current detection voltage to be included within a predetermined clamping range, the zero current detection voltage corresponding to an auxiliary voltage that is a both-end voltage of an auxiliary inductor.