Split Output Capacitor Layout for Low-Inrush Power Regulation
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Solution Overview
Problem
Existing power regulators experience significant inrush current when switching between power modes, particularly when transitioning from low-power or power-off modes to normal-power or power-on modes, which leads to inefficiencies and charge wastage.
Innovation Solution
The implementation of an electronic system with a power regulator and an output capacitance device comprising two capacitors, where one capacitor remains coupled during power-saving modes to store charge, reducing inrush current when switching back to higher power modes, and a charge supplier compensates for leakage in the isolated capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power regulator switches from power-off mode to power-on mode (or from low-power mode to normal-power mode), then the output voltage is restored to drive the load, but a large inrush current occurs causing charge wastage and inefficiency
Solution Approach 1:
The output capacitance device is divided into two separate capacitors: a first capacitor that remains coupled to the power regulator to maintain output voltage, and a second capacitor that is disconnected during power-saving modes to store charge without discharging. This segmentation prevents the inrush current problem while maintaining voltage stability.
Solution Approach 2:
The second capacitor is pre-charged to a predetermined voltage level before the power regulator switches from power-off mode to power-on mode (or from low-power mode to normal-power mode). This preliminary charging action reduces the inrush current required during mode transition by providing pre-stored charge.
2Stability of the object's composition
If a single large capacitor is used to maintain output voltage during power-saving modes, then voltage stability is maintained, but the capacitor discharges during low-power mode causing charge wastage
Solution Approach 1:
The output capacitance device is segmented into two capacitors with different functions: the first capacitor maintains output voltage stability during power-saving modes by remaining coupled to the power regulator, while the second capacitor is disconnected to avoid discharge and waste charge.
Solution Approach 2:
The second capacitor is extracted from the active circuit during power-saving modes by disconnecting it from the power regulator. This extraction prevents the capacitor from discharging during low-power mode while maintaining its charge for future use during mode transitions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly reduces inrush current and charge wastage by utilizing stored charge from the second capacitor when switching back to higher power modes, enhancing power regulation efficiency.
Implementation Method 1
The output capacitance device has a first capacitor and a second capacitor. When the power regulator is in the second power mode, the first capacitor is still coupled to the power regulator, but the second capacitor is disconnected from the power regulator and is protected from being discharged by the power regulator. Thus, while the power regulator operates in the second power mode, a considerable charge is stored within the second capacitor.
Implementation Method 2
the charge supplier has a current source, driven by the power voltage to compensate for leakage from the second capacitor
Data Source
AI summary
An electronic system using a power regulator with reduced inrush current is shown. An output capacitance device that is coupled between the power regulator and the load has a first capacitor and a second capacitor. When the power regulator is in the first power mode, the first capacitor and the second capacitor are both coupled to the power regulator. When the power regulator is in the second power mode, which uses less power than the first power mode, the first capacitor is still coupled to the power regulator, but the second capacitor is disconnected from the power regulator and is protected from being discharged by the power regulator.