Buck-Boost Controller Using Existing Signals for Mode Switching
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Solution Overview
Problem
Existing buck-boost conversion circuits require additional circuits for mode switching, increasing operational complexity and circuit area.
Innovation Solution
A controller with a slope compensation circuit, control loop, and mode switching circuit that generates switch control signals based on existing signals, simplifying mode switching without additional circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dedicated circuit is used to generate mode switching signal, then mode switching control is achieved, but circuit area and operational complexity increase
Solution Approach 1:
The patent makes existing signals (slope compensation signal and switch control signals) serve dual purposes: their original control functions plus generating mode switching signals. This eliminates the need for dedicated mode switching circuits while maintaining full control functionality.
Solution Approach 2:
The system uses its own existing signals to generate the mode switching signal autonomously. The slope compensation circuit and control loop self-generate the mode switching signal without external intervention or additional dedicated circuits, reducing overall system complexity.
2Adaptability or versatility
If additional circuits are added for mode switching, then mode switching functionality is improved, but circuit area increases
Solution Approach 1:
Existing circuits are designed to perform multiple functions: the slope compensation circuit generates both slope compensation signals and mode switching signals, while the control loop generates both switch control signals and mode switching signals. This multi-functionality maintains full mode switching capability without adding circuit area.
Solution Approach 2:
The patent combines the mode switching signal generation function with existing signal generation circuits. Instead of separate dedicated circuits, the mode switching signal is merged into the existing signal generation pathways, eliminating redundant circuitry while preserving functionality.
Data Source
AI summary
A controller of a buck-boost conversion circuit and a mode switching method thereof are provided. The controller control operations of multiple switches of the buck-boost conversion circuit to convert an input voltage into an output voltage and provide an output current. The controller includes a slope compensation circuit, a control loop, and a mode switching circuit. The slope compensation circuit generates a slope compensation signal according to a mode switching signal of a current cycle. The control loop is coupled to the slope compensation circuit and the switches respectively, and is configured to generate multiple switch control signals according to the slope compensation signal, a feedback voltage related to the output voltage, and a current sense signal related to the output current to control the operations of the switches respectively. The mode switching circuit is coupled to the slope compensation circuit and the control loop. The mode switching circuit generates the mode switching signal of a next cycle according to the slope compensation signal and at least one of the switch control signals to control an operation mode of the buck-boost conversion circuit.