DC-DC Converter Pulse-Skipping Mode Inductor Selection
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Solution Overview
Problem
Existing DC-DC converters operating in pulse-skipping mode face inflexibility in selecting inductance due to restricted peak current, leading to potential current ripples larger than in continuous conduction mode, limiting power savings under light load conditions.
Innovation Solution
A DC-DC converter with a pulse-skipping-mode control circuit that adjusts the on-time of the pulse-skipping-mode control signal based on input and output voltages, using a current source, capacitor, comparator, and SR flip-flop to maintain proportional peak current intensity, allowing flexible inductor selection by avoiding excessive current ripples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If constant inductor peak current control is used in pulse-skipping mode, then power consumption is reduced under light load conditions, but inductor selection becomes inflexible due to restricted peak current
Solution Approach 1:
The patent implements dynamic peak current control where the inductor peak current is no longer constant but dynamically adjusted based on operating conditions. The control circuit modifies the peak current threshold adaptively, allowing the system to maintain optimal performance across different load conditions while preserving inductor selection flexibility.
Solution Approach 2:
The invention changes the key parameter of inductor peak current from a fixed constant value to a dynamically variable parameter. By adjusting the peak current threshold based on operating conditions, the system resolves the contradiction between power savings and component selection flexibility, allowing wider inductor choices without compromising light-load efficiency.
2Loss of energy
If pulse-skipping mode is used to reduce switching frequencies, then power loss decreases, but current ripples may become excessively large
Solution Approach 1:
The patent incorporates feedback mechanisms where the control circuit continuously monitors operating conditions and adjusts the pulse-skipping control parameters accordingly. This feedback ensures that current ripples are kept within acceptable limits while still achieving power loss reduction through reduced switching frequencies under light load conditions.
Solution Approach 2:
The system dynamically adjusts the pulse-skipping behavior based on real-time operating conditions. Rather than using fixed pulse-skipping parameters, the control circuit adapts the skipping pattern to maintain current ripple within acceptable bounds while maximizing power savings, resolving the contradiction between energy loss reduction and current ripple control.
Data Source
AI summary
A DC-DC converter capable of operating in a pulse-skipping mode for transforming power provided by a power generator for a load circuit includes a driving circuit for generating a gate driving signal according to a feedback signal and a pulse-skipping-mode control signal, a converter circuit for transforming power provided by the power generator for the load circuit according to the gate driving signal, a feedback circuit for generating the feedback signal for the driving circuit according to a feedback voltage of the load circuit, and a pulse-skipping-mode control circuit for generating the pulse-skipping-mode control signal and adjusting on-time of the generated pulse-skipping-mode control signal according to voltages outputted from the power generator and the converter circuit, so as to adjust voltage outputted from the converter circuit via the driving circuit.