Multi-Output Power Converter Pulse Sharing for Audible Noise Control
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Solution Overview
Problem
Multiple output power converters experience audible noise due to uneven power demand variations among outputs, causing subharmonic frequencies that lead to undesirable noise within the audible band.
Innovation Solution
Pulse sharing control is implemented, allowing energy to be transferred to multiple ports during a switching cycle, reducing audible noise by sharing energy among outputs and adjusting subharmonic frequencies above the audible range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional single pulse transfer control is used in multiple output power converters, then the control structure is simple, but audible noise is generated due to subharmonic frequencies caused by uneven power demand variations among outputs
Solution Approach 1:
The patent segments the single power transfer process into multiple discrete pulse transfers to different outputs within one switching cycle. The controller divides the power distribution into separate controllable pulses for each output port, allowing independent optimization of each transfer operation to avoid subharmonic frequencies and reduce audible noise.
Solution Approach 2:
The patent implements periodic pulse sharing control where energy is transferred to multiple outputs in a structured periodic sequence within each switching cycle. By establishing regular periodic patterns in the pulse distribution timing and duration, the system eliminates irregular subharmonic variations that cause audible noise while maintaining simple overall control structure.
2Object-affected harmful factors
If pulse sharing control is implemented to reduce audible noise, then noise levels decrease, but the control algorithm becomes more complex
Solution Approach 1:
The patent incorporates feedback mechanisms where the controller monitors power demand variations among outputs and adjusts pulse sharing parameters accordingly. By using feedback from output voltage and current sensors, the system automatically optimizes pulse distribution to minimize audible noise without requiring complex manual tuning or measurement algorithms.
Solution Approach 2:
The pulse sharing control system is designed to self-regulate based on real-time output conditions. The controller automatically adjusts pulse width and timing for each output based on their respective power demands, eliminating the need for external complex measurement and adjustment mechanisms, thereby reducing audible noise with manageable algorithm complexity.
3Object-affected harmful factors
If energy is transferred to multiple ports during a switching cycle, then audible noise is reduced by sharing energy among outputs, but the switching control complexity increases
Solution Approach 1:
The patent merges multiple energy transfer operations into a single integrated switching cycle, where power is distributed to multiple outputs through coordinated pulse sharing. By combining what would traditionally be separate switching cycles into one unified control framework, the system reduces audible noise while keeping switching control complexity manageable through centralized timing management.
Solution Approach 2:
The controller is designed with universal multi-functionality to handle pulse sharing across multiple outputs using a standardized control approach. The same control circuitry and switching mechanism are used for all output ports, allowing the system to reduce audible noise through energy sharing without proportionally increasing switching control complexity, as the control logic remains consistent across different outputs.
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
Pulse sharing control effectively reduces audible noise and root mean square current, improving converter efficiency by redistributing power demand across outputs, thus minimizing noise sensitivity and increasing converter performance.
Implementation Method 1
Switch mode power converters, also referred to as switch mode power supplies (SMPSs), are commonly used due to their high efficiency, small size, and low weight to convert a high voltage ac power to a regulated dc power
Data Source
AI summary
Pulse sharing control to enhance performance in multiple output power converters is described herein. During a switching cycle, an energy pulse is provided to more than one port (i.e., output) using pulse sharing transfer. Pulse sharing transfer may enhance performance by reducing audible noise due to subharmonics and by reducing a root mean square current of one or more secondary currents. A primary switch is closed to energize an energy transfer element via a primary current. Energy may be shared among a first load port on a first circuit path via a first secondary current and among a second load port on a second circuit path via a second secondary current.