Multi-phase Power Supply Controller Dynamic Frequency Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing switching power supply controllers, particularly those using pulse width modulation (PWM), struggle to quickly respond to load transients and often introduce noise in the output voltage due to beat frequencies, failing to provide consistent regulation of output voltage across varying loads.
Innovation Solution
A multi-phase power supply controller is developed, which includes multiple channels with synchronous rectifier configurations, sense circuits, feedback loops, and dynamic threshold modulation, allowing for real-time adjustment of drive signals and timing to regulate output voltage accurately and minimize noise, without operating at a fixed frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fixed frequency PWM controllers are used to regulate output voltage, then voltage regulation is achieved, but response to load transients is slow and beat frequencies cause noise
Solution Approach 1:
The patent implements dynamic frequency adjustment by using multiple PWM generators operating at different frequencies (e.g., 500kHz, 1MHz, 2MHz) and dynamically selecting which generator to use based on load conditions. This allows the system to adapt its switching frequency in real-time, providing fast response to load transients while maintaining stable output voltage regulation through feedback control.
Solution Approach 2:
The patent divides the single PWM control function into multiple independent PWM generators, each operating at a distinct frequency. This segmentation allows the system to switch between different frequency domains depending on operational requirements, thereby resolving the contradiction between fast transient response and stable voltage regulation by operating in optimal frequency ranges for different conditions.
2Measurement precision
If multiple phases are implemented to improve response to load transients, then regulation accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges multiple PWM generators and multiple phase controllers into a single integrated controller device. This consolidation achieves multi-phase operation with improved voltage regulation accuracy while avoiding the complexity of separate discrete controllers. The integrated design shares common resources such as feedback circuits and control logic, thereby reducing overall system complexity despite implementing multiple phases.
Solution Approach 2:
The patent designs a universal controller structure that can simultaneously perform multiple functions: generating multiple PWM signals at different frequencies, controlling multiple phases, and providing unified feedback regulation. This multi-functional approach achieves high regulation accuracy across all phases while maintaining a relatively simple standardized controller architecture that can be scaled.
Data Source
AI summary
In one embodiment, a method of forming a multi-channel power supply controller includes forming a plurality of channels configured to regulate an output voltage between first and second values, configuring the controller to select a channel that has a lowest current value and initiate forming a drive signal for that channel responsively to the output voltage having a value that is less than the first value, configuring a reset circuit for each channel to terminate the respective drive signal responsively to at least the output voltage having a value greater than the first value.