Switching Power Supply Noise Reduction via Phase-Adaptive Circuit Merging
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Solution Overview
Problem
Existing switching power supply devices have insufficient noise reduction capacity, particularly when charging batteries from single-phase or polyphase AC power supplies.
Innovation Solution
A switching power supply device with multiple power supply circuits and a control unit that switches connections based on the number of phases of the AC power supply, allowing surplus power supply circuits to be connected to specific phases, thereby enhancing noise reduction by utilizing multiple filters in parallel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power supply circuits are configured to handle both single-phase and polyphase AC power supplies, then the battery can be charged with any infrastructure (single-phase or polyphase power supply), but the capacity of reducing noise may be insufficient
Solution Approach 1:
The patent merges multiple power supply circuits (first and second power supply circuits) into a unified system where they can be connected in parallel to the same phase. This combination allows the circuits to work together to provide enhanced noise reduction capacity while maintaining compatibility with both single-phase and polyphase AC power supplies.
Solution Approach 2:
The patent implements dynamic switching capability that allows the system to adapt its configuration based on the connected power supply type. The switching circuit can dynamically connect power supply circuits to different phases or to the same phase in parallel, providing flexible noise reduction while maintaining versatility across different power supply infrastructures.
2Object-affected harmful factors
If power supply circuits are connected in parallel to the same phase, then noise reduction capacity is improved, but the device complexity increases
Solution Approach 1:
The switching circuit is designed with multi-functionality to handle multiple operating modes: it can connect power supply circuits to different phases for polyphase operation, or connect them in parallel to the same phase for enhanced noise reduction. This universal design consolidates multiple functions into a single switching mechanism, managing complexity while providing flexible noise reduction capability.
Data Source
AI summary
A switching power supply device according to an embodiment of the present disclosure includes: power supply circuits corresponding to phases of a polyphase AC power supply as an external power supply; a switching circuit configured to switch a connection destination of another power supply circuit other than a specific power supply circuit corresponding to a specific phase of the external power supply among the power supply circuits to a phase corresponding to the other power supply circuit or the specific phase; and a control unit configured to connect, to each phase of the external power supply connected to the switching power supply device, the other power supply circuit corresponding to the phase, and connect the other power supply circuit as a surplus to the specific phase when the number of phases of the external power supply is smaller than the number of the power supply circuits.