Resonant Power Supply Controller Dynamic On-Time Adjustment
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Solution Overview
Problem
Resonant power supply converters face challenges in providing efficient output power protection and responsive voltage regulation, particularly with slow response times to input voltage changes and asymmetrical on-time and off-time operation.
Innovation Solution
A resonant power supply system with a power supply controller that includes a compensation circuit to adjust the on-time of power switches based on input voltage changes, using a capacitive divider and feedback network to minimize phase shift and eliminate DC offset, and a power control circuit to regulate output voltage and power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a resonant power supply converter operates with a tuned circuit including a resonant capacitor, then power conversion efficiency is improved, but response time to input voltage changes becomes slow
Solution Approach 1:
The patent implements dynamic adjustment of the resonant frequency by varying the resonant capacitance value based on detected input voltage conditions. The controller monitors input voltage and dynamically reconfigures the resonant circuit parameters to maintain optimal operating frequency under varying line conditions, thereby preserving efficiency while improving response time.
Solution Approach 2:
The system changes operational parameters (resonant frequency, switching duty cycle) in response to input voltage variations. By detecting input voltage changes and adjusting the resonant circuit parameters accordingly, the converter maintains efficient operation across different input conditions while responding quickly to voltage changes.
2Loss of energy
If a resonant power supply converter uses a tuned circuit with resonant capacitor, then power conversion efficiency is improved, but output power protection becomes complex
Solution Approach 1:
The patent incorporates feedback mechanisms that monitor output power conditions and provide real-time information to the controller. By using feedback from output current and voltage sensing, the system can detect over-power conditions and adjust switching parameters accordingly, providing protection without requiring complex additional circuitry.
Solution Approach 2:
The resonant converter utilizes its inherent resonant characteristics and control circuitry to provide self-protection against over-power conditions. The controller monitors operating parameters and automatically adjusts switching duty cycle or frequency to prevent excessive power delivery, eliminating the need for separate complex protection circuits.
3Device complexity
If a resonant power supply converter operates with fixed duty cycle, then circuit operation is simplified, but on-time and off-time symmetry deteriorates
Solution Approach 1:
The patent implements dynamic duty cycle adjustment based on detected input voltage conditions. The controller varies the switching duty cycle to maintain symmetrical on-time and off-time periods, ensuring balanced operation of the resonant circuit while adapting to changing input conditions. This dynamic control preserves circuit simplicity while achieving timing symmetry.
4Reliability
If a resonant power supply converter uses complex protection circuits, then output power protection is improved, but device complexity increases
Solution Approach 1:
The patent makes the control circuitry perform multiple functions: primary voltage regulation, over-power protection, and operational monitoring. By integrating these functions into a single control architecture that leverages the resonant circuit's natural characteristics, the system achieves reliable protection without adding separate complex protection circuits.
Data Source
AI summary
In one embodiment, a power supply controller may be configured to form a status signal that is representative of a secondary current by substantially removing a primary magnetization component from a primary current signal and to use the status signal to form a first signal that is representative of a delivered output power, and configured to adjust an on-time of one of a first or second switch responsively to the delivered output power.