Multiphase Power Converter PCB Layout for Ripple and Capacitor Reduction
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Solution Overview
Problem
Conventional power converter modules face limitations in increasing power output while maintaining miniaturization due to the upper limit of phase-staggered control signals, leading to restricted phase number connections and increased size and current ripple.
Innovation Solution
A power converter module with alternating arrangements of switching circuit combinations and capacitors, where control signals for different combinations are partially out of phase, allowing AC currents to cancel each other, reducing the number of capacitors needed and minimizing current ripple and AC loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If N-phase power converter units are connected in parallel with phase-staggered control signals, then current ripple is reduced and capacitor size is reduced, but the number of phases is limited by the upper limit of phase-staggered control signals
Solution Approach 1:
The power converter module is divided into multiple independent switching circuit combinations, each combination containing multiple switching circuits. This segmentation allows each combination to be controlled independently with different phase angles, overcoming the limitation of traditional single-phase-staggered control and enabling higher effective phase numbers for reduced current ripple.
Solution Approach 2:
The invention introduces dynamic phase control where different switching circuit combinations operate with different phase angles (e.g., 0°, 120°, 240°). This dynamic phasing strategy allows the system to adaptively reduce current ripple and optimize capacitor requirements based on the operational characteristics of each combination.
2Power
If more switching phases are added to increase power output, then power density increases, but the size of the power converter module increases
Solution Approach 1:
Multiple switching circuits are merged into switching circuit combinations that share common capacitors. By combining circuits that operate at different phases, the system achieves higher power output while using fewer capacitors, thereby increasing power density without proportionally increasing module size.
Solution Approach 2:
The capacitors serve multiple functions: they act as input capacitors for multiple switching circuits simultaneously, provide energy storage, and filter current ripple through the phase-staggered operation. This multi-functionality reduces the total number of capacitors needed, decreasing module size while maintaining high power output capability.
3Loss of energy
If phase-staggered parallel connections are used, then conversion efficiency improves, but the number of control signals reaches the upper limit
Solution Approach 1:
The control system is segmented into multiple independent control channels, each managing a switching circuit combination. This allows the controller to generate multiple phase-staggered control signals (e.g., 0°, 120°, 240°) without overloading a single control channel, maintaining high conversion efficiency while managing control complexity through structured segmentation.
Data Source
AI summary
A power converter module includes a multilayer printed circuit board, a switching device, a controlling device and a capacitor device. The switching device includes two switching circuit combinations. Each of the switching circuit combinations includes two switching circuits connected in parallel. Each of the switching circuits includes a switching unit. Each of the switching circuits extracts charges from different capacitors. The controlling device is configured for outputting a first control signal and a second control signal to control the switching circuits of the first switching circuit combination and the switching circuits of the second switching circuit combination respectively. The first control signal and the second control signal are out of phase with each other. On a direction, the switching units of the first switching circuit combinations and the switching units of the second switching circuit combinations are alternately arranged.