Converter Control Unit for AC Power Factor Improvement
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Solution Overview
Problem
Existing DC/DC converters are not optimized for improving the power factor when AC power is input, leading to inefficiencies in power transmission.
Innovation Solution
A converter configuration with a transformer having primary, secondary, and tertiary windings, and corresponding converters with switching elements and a control unit that manages power flow to maintain constant voltage and current, optimizing power factor and supply between converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional DC/DC converter configuration is used, then the converter operates efficiently with DC power input, but the power factor deteriorates when AC power is input
Solution Approach 1:
The converter is designed with a three-winding transformer and multiple converters (primary, secondary, and tertiary) that can operate in different modes. The control unit switches between operating modes depending on whether AC or DC power is input, enabling the same device to function efficiently with both AC and DC inputs while maintaining good power factor with AC input
2Adaptability or versatility
If AC power is input to the primary converter, then the converter can operate with alternative power sources, but the power factor and power transmission efficiency deteriorate
Solution Approach 1:
The control unit dynamically adjusts the operating mode based on the input power type. When AC power is detected, the control unit activates the primary converter and adjusts the switching elements to operate in a mode that improves power factor and reduces harmonic currents, thereby minimizing energy loss while accepting AC input
3Use of energy by moving object
If the converter operates with AC power input, then power factor improvement is necessary, but additional control complexity is introduced
Solution Approach 1:
The control unit monitors the input power type and adjusts the switching control of the converters accordingly. By detecting whether AC or DC power is input and switching between predefined operating modes, the control unit achieves power factor improvement without requiring overly complex real-time calculations, thus balancing performance with control simplicity
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 improves the power factor of AC power input into the primary converter, ensuring efficient power transmission and reducing harmonic currents.
Implementation Method 1
a transformer having a primary winding, a secondary winding, and a tertiary winding
Data Source
AI summary
To achieve an improvement in the power factor of the input into a primary converter in a case of inputting alternating-current (AC) power. A converter is provided with a control unit that performs a switching control such that power is supplied from a primary converter to a secondary converter while keeping a voltage supplied to a load constant, and also such that power is supplied from the primary converter to a tertiary converter while keeping a current supplied to a tertiary capacitor constant.