SIMO Power Supply Circuit Adaptive ON-Time Control
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Solution Overview
Problem
Conventional single inductor multiple output (SIMO) power supply circuits face challenges in effectively controlling output voltages across varying loads, leading to inefficiencies and increased power consumption due to inadequate control over switching frequencies and inductor current modes.
Innovation Solution
The power supply circuit incorporates a detection circuit and comparison circuit to monitor inductor current and output voltage, using a control circuit to adjust the ON-time of switching transistors based on feedback signals, allowing for mode switching between maximal and minimal ON-time control modes to optimize output voltage regulation and reduce power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional SIMO power supply circuits are used without advanced control mechanisms, then the circuit structure remains simple, but output voltage regulation precision deteriorates and power consumption increases
Solution Approach 1:
The patent implements dynamic control of switching transistor ON-times based on real-time detection of inductor current modes. The control circuit adjusts ON-times adaptively according to whether the inductor operates in continuous conduction mode (CCM) or discontinuous conduction mode (DCM), enabling precise output voltage regulation while responding to varying load conditions. This dynamic adjustment mechanism resolves the contradiction by making the control system adaptive rather than static.
Solution Approach 2:
The patent employs feedback mechanisms where detection circuits continuously monitor inductor current and operational states, and the control circuit uses this information to adjust switching transistor ON-times. This closed-loop feedback system enables precise output voltage regulation by comparing actual operating conditions with desired states and making real-time corrections, thereby resolving the precision-complexity contradiction through intelligent control.
2Use of energy by moving object
If switching frequencies are not optimized based on load characteristics, then the control mechanism remains simple, but power consumption increases and efficiency deteriorates
Solution Approach 1:
The patent dynamically adjusts switching frequencies and ON-times based on detected load characteristics and inductor current modes. The control circuit automatically adapts operating parameters to match actual load conditions, enabling efficient power consumption by avoiding fixed suboptimal settings. This dynamic adaptation resolves the contradiction between simple control and automated adaptive control by implementing intelligence only where needed for energy optimization.
Solution Approach 2:
The patent changes operational parameters (switching frequencies, ON-times) based on detected load conditions and inductor modes. By adjusting these parameters dynamically rather than maintaining fixed values, the system optimizes power consumption efficiency while adapting to varying operational requirements, thereby resolving the contradiction between automated control level and energy efficiency.
3Reliability
If the ON-time of switching transistors is not precisely controlled, then the control mechanism remains simple, but output voltage regulation performance deteriorates
Solution Approach 1:
The patent uses feedback from detection circuits that monitor inductor current modes and operational states to precisely control switching transistor ON-times. This feedback mechanism ensures reliable output voltage regulation by continuously adjusting control parameters based on actual operating conditions, resolving the contradiction between simple control mechanisms and high regulation performance through intelligent closed-loop control.
Solution Approach 2:
The patent implements dynamic ON-time control that adapts to real-time operational conditions and load variations. By making ON-times variable rather than fixed, the system achieves reliable output voltage regulation across different operating scenarios while maintaining a control mechanism that only becomes complex when adaptability is required.
Data Source
AI summary
According to one embodiment, a power supply circuit is adapted to turn on a switching transistor connected between an input terminal and an output node and supply current via an inductor to a capacitor connected to the output node, so as to obtain an output voltage from an output terminal connected to the capacitor. A detection signal according to current flowing in the inductor or a detection signal according to a comparison result between the output voltage and a reference voltage are detected at a predetermined time, and an ON-time of the transistor is controlled in accordance with the detection signal.