Programmable Converter Control for CCM, TM, and DCM Transitions
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Solution Overview
Problem
Existing switching converter technologies face challenges in efficiently managing power stages across various modes of operation, such as continuous conduction mode (CCM), transition mode (TM), and discontinuous conduction mode (DCM), while maintaining optimal efficiency and power density.
Innovation Solution
A programmable switching converter controller is introduced, featuring a pulse-width modulator that generates on-time and off-time intervals based on demand signals and inductor voltage, allowing for adaptive control of the switch in the power stage to optimize performance across different modes of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a switching converter controller uses fixed control parameters for power stage operation, then the device complexity is reduced, but the adaptability to different modes of operation (CCM, TM, DCM) and voltage ranges deteriorates
Solution Approach 1:
The patent implements dynamic control parameters that automatically adjust based on operating conditions. The controller dynamically selects between CCM, TM, and DCM modes and adjusts Ton/Toff intervals according to the actual operating state, enabling smooth transitions between modes while maintaining optimal efficiency across different voltage and load conditions without requiring complex external configuration
2Loss of energy
If the controller implements precise control of on-time and off-time intervals, then the efficiency and power density are improved, but the device complexity increases
Solution Approach 1:
The patent changes the control approach by using variable Ton and Toff intervals instead of fixed duty cycle control. The controller adjusts these time parameters based on operating mode and load conditions, achieving high efficiency across different operating points. The use of programmable time intervals allows precise control of power stage operation without requiring overly complex control circuits
Solution Approach 2:
The controller dynamically adjusts the on-time and off-time intervals based on real-time operating conditions. By implementing mode-dependent timing control where Ton and Toff vary with the operating mode (CCM, TM, or DCM), the system achieves optimal efficiency while maintaining a relatively simple control architecture through systematic parameter variation
3Adaptability or versatility
If the switching converter operates across a wide range of input and output voltages, then the adaptability is improved, but the reliability of maintaining regulation deteriorates
Solution Approach 1:
The patent implements dynamic mode selection that automatically adapts to different voltage conditions. The controller transitions between CCM, TM, and DCM based on the operating point, ensuring stable regulation across a wide input voltage range (9V to 58V) and output voltage range (5V to 20V). This dynamic adaptation maintains reliable voltage regulation by optimizing the operating mode for each specific voltage condition
Data Source
AI summary
A programmable switch converter controller for a power stage with a switch, an inductor, and a diode, includes a pulse-width modulator. The pulse-width modulator is configured to: generate an on-time interval (Ton) that is fixed or proportional to a demand signal proportional to a load adapted to be coupled to an output of the power stage; generate an off-time interval (Toff) that is inversely proportional to the product of a voltage across the inductor while the switch is off and a demand signal proportional to the load; initiate Ton when Toff elapses; and initiate Ton responsive to an external trigger signal.