Multi-phase Boost Converter Phase Self-Detection Circuit
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Solution Overview
Problem
Conventional multi-phase boost converters lack an internal mechanism to detect the presence of inductors, leading to unnecessary power consumption as the PWM controller controls switching transistors for phases without inductors, even in low power operations where some phases can be disconnected.
Innovation Solution
A multi-phase boost converter with phase self-detection and a detecting circuit that determines the conduction status of each phase, allowing the control circuit to selectively control switching circuits only when an inductor is present, thereby reducing excess power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the PWM controller controls switching transistors for all phases in a multi-phase boost converter, then the voltage regulation function is maintained, but unnecessary power consumption occurs when some phases have no inductors connected
Solution Approach 1:
The detecting circuit performs preliminary detection of inductor presence in each phase before the PWM controller activates switching transistors. By detecting the conduction status between the input voltage and each input end in advance, the system determines which phases actually have inductors connected, allowing the controller to skip unnecessary switching operations for phases without inductors, thus reducing power consumption without adding complex control logic
Solution Approach 2:
The detecting circuit automatically detects the conduction status of each phase and provides detection results to the control circuit, enabling the system to self-adjust which phases are active. This self-detection mechanism eliminates the need for external intervention or complex control algorithms to identify inactive phases, allowing the system to autonomously reduce power consumption by disabling switching operations in phases without inductors
2Quantity of substance
If inductors are removed from some phases to reduce component costs in low power operation, then component cost is reduced, but the conventional converter lacks detection mechanism leading to wasted quiescent current
Solution Approach 1:
The detecting circuit continuously monitors the conduction status between the input voltage and each input end, providing real-time feedback information about which phases have inductors connected. The control circuit receives this feedback and adjusts the switching control accordingly, enabling dynamic adaptation to the actual hardware configuration. This feedback mechanism ensures that even when inductors are removed to reduce component costs, the system automatically detects the reduced configuration and eliminates quiescent current waste by disabling control signals to phases without inductors
Data Source
AI summary
A multi-phase boost converter with phase self-detection and a detecting circuit thereof are provided. The multi-phase boost converter comprises M switching circuits, a capacitor, a control circuit and a detecting circuit. Each switching circuit has an input end and an output end. N inductors are coupled in parallel between the input ends and an input voltage. The output ends are coupled to an output voltage. The control circuit controls the conduction status of the switching circuits according to a feedback voltage corresponding to the output voltage. The detecting circuit coupled between the input ends and the control circuit detects the conduction status between the input voltage and each of the input ends, for outputting a first control signal. The control circuit controlled by the first control signal selectively controls at least one of the switching circuits. N is a positive integer less than or equal to M.