Control Circuit Selecting Feedback for Dual Output Power Converter
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Solution Overview
Problem
Existing switched-mode power supply (SMPS) systems face challenges in efficiently managing dual output requirements for constant voltage and constant current loads, leading to increased complexity, energy loss, and high costs due to the use of multiple feedback signals and components, which complicates system stability, especially under light load conditions.
Innovation Solution
A control circuit that selectively uses feedback signals from both constant current and constant voltage output modules to regulate the switching state of the power switch, simplifying the circuit by choosing one feedback signal based on operational states to control the power stage circuit, thereby reducing component count and energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple feedback signals are used to manage dual output requirements, then the power supply can support both constant voltage and constant current loads, but the circuit complexity increases and system stability deteriorates
Solution Approach 1:
The patent combines multiple feedback signals (constant current feedback and constant voltage feedback) into a single unified feedback input for the control circuit. The control circuit selectively processes one feedback signal based on operating conditions, merging the dual-output control functions into one integrated control path, thereby reducing circuit complexity while maintaining adaptability
Solution Approach 2:
The control circuit is designed with multi-functionality to handle both constant voltage and constant current modes through a single feedback input. The control circuit can selectively process different feedback signals based on operational states, making one control path serve multiple functions and eliminating the need for separate control circuits for each output mode
2Adaptability or versatility
If multiple feedback signals and components are used, then dual output requirements are met, but energy loss increases and costs rise
Solution Approach 1:
The patent extracts and eliminates redundant feedback components and signal processing paths from the system. By using only one active feedback input at a time based on operational state, the system removes unnecessary components and signal routing that would otherwise consume energy, reducing overall energy loss while maintaining dual-output functionality
3Adaptability or versatility
If multiple feedback signals are used, then both constant voltage and constant current outputs are controlled, but system stability worsens especially under light load conditions
Solution Approach 1:
The control circuit employs dynamic selection of feedback signals based on real-time operational states. The circuit automatically switches between processing constant current feedback and constant voltage feedback depending on which output mode is active and load conditions, creating a dynamic control system that adapts to varying conditions and maintains stability across different operating points including light load conditions
Data Source
AI summary
A control circuit for controlling a power converter can include: a constant voltage output module, a constant current output module, and a power stage circuit; and where the control circuit is configured to select one of a first feedback signal representative of output information of the constant current output module, and a second feedback signal representative of output information of the constant voltage output module as a feedback input signal based on operation states of the constant current output module and the constant voltage output module, in order to control a switching state of a power switch of the power stage circuit.