Power Converter Controller for Fast Transient Response
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Solution Overview
Problem
Low-dropout regulators (LDOs) face challenges in achieving desirable line and load regulation during limited load changes, but exhibit poor response speeds during sudden load changes, such as when devices transition between standby and active modes.
Innovation Solution
A power converter with a controller that uses multiple transistors and comparators to adjust current output based on reference voltages, ensuring fast response to load changes by sequentially turning on/off transistors when voltage thresholds are crossed, thereby maintaining line and load regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an LDO is used for voltage regulation, then line and load regulation are achieved during limited load changes, but response speed deteriorates during sudden load changes
Solution Approach 1:
The patent implements a dynamic control system that switches between LDO mode and capacitor discharge/charge mode based on load conditions. The controller dynamically adjusts the equivalent output capacitance by connecting or disconnecting the capacitor from the output terminal, enabling fast response during sudden load changes while maintaining regulation during normal operation
Solution Approach 2:
The patent segments the voltage regulation function into two independent paths: the LDO provides precise regulation during normal operation, while the output capacitor provides fast transient response. The controller selectively activates each path based on detected load change conditions, allowing each component to optimize its performance in its designated operating range
2Speed
If the equivalent output capacitance is increased to improve transient response, then response speed to sudden load changes improves, but stability and voltage regulation deteriorate
Solution Approach 1:
The patent dynamically adjusts the equivalent output capacitance by connecting the capacitor to the output terminal only when sudden load changes are detected. During normal operation, the capacitor is disconnected to maintain stable voltage regulation. When transient conditions occur, the capacitor is connected to provide additional charge/discharge capability, thus optimizing response speed without compromising steady-state stability
Data Source
AI summary
A power converter including: a regulator including an output terminal to output an output voltage according to a first reference voltage, the output terminal to be coupled to a load; and a controller coupled to the output terminal, the controller to increase a current at the output terminal when a voltage at the output terminal is lower than a second reference voltage, and to decrease the current at the output terminal when the voltage at the output terminal is greater than a third reference voltage.