Inductive-Capacitive Power Factor Correction Circuit
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Solution Overview
Problem
Existing power conditioning systems face challenges in achieving low cost and efficient power factor correction, leading to high VA consumption and increased costs due to the need for additional components like transformers and EMC protection, especially in low voltage applications.
Innovation Solution
A power transformation system incorporating inductive-capacitive circuits with a transistor/switch and level shifter, controlled by a microcontroller, which provides pulse width modulation signals for power factor correction and voltage regulation, reducing VA consumption and integrating EMC protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional power factor correction systems are used, then power factor correction is achieved, but VA consumption increases and costs increase due to additional components
Solution Approach 1:
The patent combines the power factor correction circuit and voltage regulation circuit into a single integrated system. The PFC circuit uses an inductor-capacitor network to correct power factor, while the voltage regulator (LM317) simultaneously provides voltage regulation. This merging eliminates the need for separate transformers and EMC protection components that would otherwise be required in traditional systems, reducing VA consumption while maintaining both power factor correction and voltage regulation functions.
2Reliability
If traditional power factor correction systems are used, then power factor correction is achieved, but costs increase due to additional components like transformers and EMC protection
Solution Approach 1:
The patent merges multiple functions into a single circuit architecture that eliminates the need for expensive additional components. The integrated PFC and voltage regulation system removes the requirement for separate transformers and dedicated EMC protection circuits, significantly reducing component count and manufacturing cost while maintaining effective power factor correction.
Solution Approach 2:
The circuit design achieves multi-functionality where the same inductor-capacitor network performs both power factor correction and voltage regulation. The transistor switch and control circuitry serve dual purposes in both PFC operation and voltage control, eliminating the need for separate dedicated components for each function and thereby reducing overall system cost.
3Manufacturing precision
If pulse width modulation control is implemented, then voltage regulation is improved, but device complexity increases
Solution Approach 1:
The patent introduces a level shifter circuit as an intermediary between the microcontroller and the transistor switch. This level shifter adapts the microcontroller's logic level signals to the appropriate voltage levels for controlling the power switch, enabling PWM-based voltage regulation without requiring complex high-voltage control circuitry. The level shifter simplifies the overall control architecture while maintaining precise voltage regulation 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 system effectively reduces VA consumption and costs by improving power factor correction and voltage regulation, while providing EMC protection, thus offering a cost-effective solution for low voltage applications.
Implementation Method 1
inductive-capacitive circuits configured to receive AC power and filter out output power
Implementation Method 2
inductive-capacitive circuits configured to receive AC power and filter out output power
Implementation Method 3
a transistor/switch configured to connect or disconnect the input inductive-capacitive circuit to or from, respectively, an output filter
Implementation Method 4
The level shifter may provide pulse width modulation control signals to the transistor/switch for connection or disconnection
Implementation Method 5
an input for controlling the level shifter may be provided by an output from a micro controller which is developed by a program that processes information from the output voltage
Data Source
AI summary
A power transformation system that may incorporate inductive-capacitive circuits configured to receive AC power and filter out output power, a voltage regulator (e.g., microprocessor), a transistor/switch configured to connect or disconnect the input inductive-capacitive circuit to or from, respectively, an output filter, and a level shifter configured to provide a control signal to the transistor to connect or disconnect the inductive-capacitive circuit via the transistor/switch, to or from, respectively, the output filter. The input inductive-capacitive circuit may provide power factor correction for the AC power. The level shifter may provide pulse width modulation control signals to the transistor/switch for connection or disconnection between the inductive-capacitive circuit and the output filter. An input for controlling the level shifter may be provided by an output from a micro controller which is developed by a program that processes information from the output voltage received by the inductive-capacitive circuit output filter.