Step-Up Voltage Regulator Using Emulated Flywheel Current Injection
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Solution Overview
Problem
Conventional voltage regulators face inefficiencies and increased manufacturing costs due to the need for intrinsic resistance in feedback paths, which can lead to unstable output voltage and high ripple, especially at low load conditions.
Innovation Solution
The use of an emulated flywheel current injection control (eFCIC) circuit replaces the function of equivalent series resistance (ESR) in output capacitors, generating an injection reference voltage to control the output voltage and reduce ripple, thereby maintaining stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistance is included in the feedback path for stabilization of output voltage, then output voltage stability is improved, but manufacturing costs increase and operational efficiency decreases
Solution Approach 1:
The patent extracts and eliminates the resistance element from the feedback path by using an emulated flywheel current injection control circuit that generates an injection reference voltage to replace the traditional resistive feedback mechanism, thereby maintaining voltage stability without the energy losses associated with physical resistance
Solution Approach 2:
The patent introduces an emulated flywheel current injection control circuit as an intermediary that generates an injection reference voltage to mediate between the feedback signal and the control mechanism, providing the necessary stabilization function without requiring physical resistance in the feedback path
2Reliability
If resistance is included in the feedback path for stabilization of output voltage, then output voltage stability is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent removes the need for physical resistance components in the feedback path by extracting this function and replacing it with an active control circuit that generates an injection reference voltage, thereby simplifying the overall circuit architecture while maintaining stabilization performance
Solution Approach 2:
The patent replaces the passive mechanical/resistive feedback mechanism with an active electronic control system that uses voltage generation and injection to achieve the same stabilization effect, eliminating the need for physical resistance elements
3Reliability
If conventional feedback circuitry is used with resistance, then output voltage can be stabilized, but output voltage ripple increases
Solution Approach 1:
The patent introduces an emulated flywheel current injection control circuit as an intermediary that generates an injection reference voltage to counteract ripple components, providing a cleaner output voltage while maintaining the necessary feedback stabilization function without the harmful effects of resistive feedback
Solution Approach 2:
The patent converts the potential harm of ripple into a benefit by using the injection reference voltage mechanism to actively cancel and suppress ripple components, transforming what would be a harmful effect into an opportunity for improved output quality
4Power
If resistance is used in feedback path, then voltage regulation can be achieved, but power efficiency decreases especially at low load conditions
Solution Approach 1:
The patent extracts and eliminates the resistive element from the feedback path, replacing it with an active control mechanism that generates an injection reference voltage, thereby maintaining voltage regulation capability while eliminating the continuous power dissipation that occurs with resistive feedback especially at low load conditions
Data Source
AI summary
A regulator circuit and a method of generating a stable, low-ripple output, step-up or step-down voltage are disclosed. A low ESR (Equivalent Series Resistance) output capacitor is employed to provide low output voltage ripple. A voltage, −VESRi, is generated using information based on an input voltage and the output voltage. −VESRi is coupled onto an intermediate reference voltage generated by an integrator based on the output voltage and a constant reference voltage, to form another voltage, VREFi. VREFi is coupled to an input of a feedback comparator, instead of a plain constant reference voltage, to modulate the duty cycle of a main switch. The output voltage is inputted as a feedback signal to another input of the feedback comparator. −VESRi, is generated using information based on an input voltage and the output voltage in such a way that output voltage is stable without sub-harmonic oscillation.