PWM Edge Control for Multiphase Power Supply Transients
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Solution Overview
Problem
Conventional power supply controllers face challenges in efficiently regulating output voltage under dynamic load conditions and transient events, particularly in maintaining stable voltage and current balance across multiple phases, which affects the overall efficiency and stability of energy conversion.
Innovation Solution
The implementation of a power supply controller that generates current control signals and switching period adjustment signals based on error voltage differences, allowing for dynamic modulation of pulse width modulation signals to match load currents and adjust switching periods, thereby ensuring output voltage stability and balance across multiple phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fixed frequency PWM control is used, then the control loop can reduce error voltage, but the output voltage regulation deteriorates under dynamic load conditions
Solution Approach 1:
The patent implements variable frequency PWM control where the switching frequency is dynamically adjusted based on load conditions. The controller transitions from fixed frequency operation to variable frequency operation during transient events, allowing the system to adapt its switching characteristics to match dynamic load requirements while maintaining stable output voltage regulation
Solution Approach 2:
The patent changes the switching frequency parameter dynamically in response to load conditions. By detecting transient events and adjusting the PWM frequency accordingly, the system optimizes its performance for different operating conditions, improving both voltage regulation and dynamic response capability
2Speed
If the switching frequency is increased to improve dynamic response, then the transient response improves, but the switching losses increase
Solution Approach 1:
The system dynamically adjusts switching frequency based on actual load conditions rather than operating at high frequency continuously. During transient events, frequency increases to improve response speed, but returns to lower frequencies during steady-state operation to minimize switching losses, achieving optimal balance between performance and efficiency
Solution Approach 2:
The controller uses periodic detection of transient conditions to trigger frequency adjustments. By applying high-frequency switching only during necessary transient periods and using lower frequencies during normal operation, the system achieves fast transient response when needed while minimizing overall energy loss
3Power
If multiple power supply phases are used to handle high current, then the current capacity increases, but the phase current balance deteriorates
Solution Approach 1:
The patent implements feedback control that monitors phase current differences and adjusts PWM duty cycles accordingly. The controller detects imbalances between phases and dynamically modifies switching parameters to equalize current distribution, maintaining balanced operation across multiple phases even under high current conditions
Data Source
AI summary
An apparatus includes a controller a current mode controller that produces an output voltage by supplying output current from at least one power supply phase of a power supply to power a load. The controller produces an error current signal based on a difference between a magnitude of the output current supplied from the power supply to a load and a phase current setpoint. Based on a magnitude of the error current signal, control a pulse width setting of a pulse width modulation signal controlling the at least one power supply phase. The controller varies a leading edge and a falling edge of a pulse width ON-time of the pulse width modulation signal over each of multiple control cycles depending on variations in the magnitude of the pulse width setting.