Optimal Digital Power Control Principle Based on LLC Resonant Converter

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Overview:
The author introduces us to a digital power control implementation using a line level control (LLC) resonant converter based on a flexible 32-bit low-cost, high-performance microcontroller. The article also explores some of the key elements of digital power control, including duty cycle control, real-time deadband regulation, frequency control, and maintaining adaptive thresholds for different safe operating zones.

The emergence of new low-cost, high-performance microcontrollers (MCUs) allows a wide range of embedded industrial control applications to enjoy the benefits of digital power control. Traditional analog power systems are susceptible to factors such as frequency drift, component aging, temperature-induced changes, and component tolerance degradation. In addition, developers are often stuck with some classic control implementations. In addition, the analog system is not flexible enough to adapt to the working conditions of different environments, and even has strict regulations on system requirements.

When we design digitally, we can implement the power system part in software to achieve a degree of flexibility, allowing a single architecture to provide optimal performance across applications and operating conditions. . Using software control algorithms, developers can:
* Ensure accurate and predictable system performance through configuration (in the factory and at power-up) to address component tolerance issues
* Use advanced algorithms (eg nonlinear, multivariable, etc.) to improve efficiency, but not feasible in analog systems
* Stable performance over long system life through dynamic calibration
* Support multiple systems with a single controller
* Improve system reliability through self-diagnosis
* Intelligent communication using communication links
* Allow developers to simplify system design using model tools and C language, eliminating the need to re-simulate designs when changes are required
* Supports other system functions on the same MCU, reducing system cost

This article introduces a digital power control implementation using a line level control (LLC) resonant converter based on a flexible 32-bit low-cost, high-performance microcontroller. The article explores some of the key elements of digital power control, including duty cycle control, real-time deadband regulation, frequency control, and adaptive thresholds to maintain different safe operating zones.
When an active load is present, the voltage compensator can be fine tuned using various coefficients, which shows the flexibility of the implementation. The use of programmable soft-start/stop functions and slew rate control eliminates inrush currents and reduces effective noise. Finally, developers can also see that Hybrid Burst Mode control can greatly improve light load and standby efficiency.

(Please read the PDF for details)