Power Conversion Apparatus with Merged Rectification and Harmonic Suppression
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Solution Overview
Problem
Existing power conversion systems face efficiency losses due to multi-stage conversions and fail to effectively suppress current harmonics, which are essential for power saving and environmental compatibility.
Innovation Solution
A power conversion apparatus with a closed-loop circuit configuration using series-connected switches and capacitors, along with a controller that generates pulse signals to mix high and low frequency components in the AC power supply, allowing for efficient conversion and harmonic suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-stage conversion configuration (AC-DC, DC-DC step-up, DC-DC step-down) is used, then voltage conversion capability is improved, but conversion efficiency deteriorates
Solution Approach 1:
The patent merges the AC-DC rectification stage and DC-DC conversion stage into a single integrated circuit. The bridge circuit performs both full-wave rectification and voltage conversion functions simultaneously, eliminating the need for separate PFC and step-down converter stages. This consolidation reduces the number of conversion stages from three to one, thereby improving overall conversion efficiency while maintaining voltage conversion capability.
2Object-generated harmful factors
If a power factor improvement converter is added, then current waveform quality is improved, but conversion efficiency deteriorates
Solution Approach 1:
The patent combines the power factor correction function with the main conversion circuit. The bridge circuit is designed to perform both rectification and current waveform shaping simultaneously, eliminating the need for a separate PFC stage. This integration maintains sinusoidal input current with high power factor while avoiding the additional energy losses that would result from a separate conversion stage.
3Ease of operation
If series-connected diodes are used for rectification, then full-wave rectification is achieved, but power loss increases
Solution Approach 1:
The patent changes the electrical parameters of the rectification circuit by using active switching elements (transistors) instead of passive diodes. The switching elements are controlled to achieve full-wave rectification with lower voltage drops compared to series-connected diodes. This parameter change reduces the power loss in the rectification process while maintaining the full-wave rectification function.
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
This configuration achieves high conversion efficiency and effective suppression of current harmonics, enabling constant power supply to the load with reduced energy loss and environmental impact.
Implementation Method 1
a control portion configured to output pulse signals for alternately switching the first and second switches to the first and second capacitors based on a circuit current and a supply voltage so that a current in which a high frequency component is mixed with a low frequency component of the AC power supply flows through the power conversion circuit
Data Source
AI summary
A controller outputs pulse signals to a first switch and a second switch based on a circuit current flowing through a power conversion circuit and a voltage of an AC power supply. The first switch is opened and closed alternately to the second switch. According to the opening and closing, a current in which a high frequency component is mixed with a low frequency component of the AC power supply flows through the power conversion circuit.