Emulated Current-Mode Power Supply Startup Without Output Voltage Dips
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Solution Overview
Problem
Conventional power supplies, particularly single-stage DC-to-DC converters, face inefficiencies in regulating output voltage and managing energy conversion, which hampers the efficient use of raw energy from both green and non-green energy sources, leading to increased environmental impact.
Innovation Solution
A power supply system that includes a storage component, an offset reference generator, and a controller to adjust the output voltage of a power converter based on an offset output current value, using a threshold signal generated by a master power converter phase to control slave phases, ensuring efficient energy conversion and reduced environmental footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional single-stage DC-to-DC converters are used to convert input voltage to output voltage, then the power supply can deliver output power to the load, but the energy conversion efficiency is low and energy waste is high
Solution Approach 1:
The power converter is divided into multiple phases (first phase, second phase, etc.) that operate in parallel. Each phase has its own switch circuitry and controls the conversion of input voltage to output voltage independently. This segmentation allows for better distribution of energy conversion tasks, reducing overall energy loss and improving conversion efficiency compared to a single-stage converter.
Solution Approach 2:
The control switch duty cycle is dynamically adjusted based on the difference between the output voltage feedback signal and the reference voltage. This parameter change approach allows the converter to adapt to varying load conditions and maintain optimal energy conversion efficiency, minimizing energy waste during different operating states.
2Reliability
If the output voltage is regulated by comparing output voltage magnitude to control switch circuitry, then the output voltage can be maintained within desired range, but the control complexity increases
Solution Approach 1:
A feedback mechanism is implemented where the output voltage is monitored and compared to a reference voltage. The difference signal is used to adjust the control switch duty cycle, creating a closed-loop control system that automatically maintains output voltage within the desired range. This feedback approach simplifies the control logic while ensuring reliable voltage regulation.
Solution Approach 2:
The power converter phases automatically adjust their operation based on the feedback from the output voltage. The system self-regulates by using the voltage difference signal to control the switch duty cycle, eliminating the need for complex external control circuitry and reducing overall system complexity while maintaining reliable regulation.
3Productivity
If multiple power converter phases are used to improve energy conversion efficiency, then the energy waste is reduced, but the device complexity increases
Solution Approach 1:
The power converter is segmented into multiple identical phases that can be easily replicated and configured in parallel. Each phase is a self-contained module with similar structure, making the system scalable and manageable despite the increased number of components. This modular segmentation reduces the perceived complexity by providing a systematic approach to multi-phase configuration.
Solution Approach 2:
Each power converter phase is designed with universal characteristics, performing the same voltage conversion function. The phases can be interchangeably configured and controlled using similar circuitry and control logic. This universality allows the system to handle increased power conversion requirements without proportionally increasing control complexity, as the same design principles apply to each phase.
Data Source
AI summary
A power supply includes a storage component to store an output current value representative of a magnitude of output current supplied by an output voltage of a power converter to power a load. The power supply further includes an offset reference generator and a controller. The offset reference generator produces an offset reference signal, the output current value being offset by the offset reference signal. The controller controls generation of the output voltage of the power converter as a function of the offset output current value with respect to a threshold signal (value). Additionally, the controller is configured to detect a startup mode of a power converter operative to convert an input voltage into an output voltage. During the startup mode, the controller: i) produces a threshold signal having a magnitude that varies over time, and ii) controls operation of switches in the power converter as a function of the threshold signal while the power converter is operated in a diode emulation mode. Implementation of the startup mode monotonically increases a magnitude of the output voltage without dips.