Switching-Capacitor Regulator Charge Injection Mode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional switching-capacitor regulators experience significant voltage drops and unstable operations when the loading current exceeds the maximum current they can provide, leading to decreased allowable loading currents and system instability.
Innovation Solution
A switching-capacitor regulator with a charge injection mode is designed, incorporating a storage capacitor, a switch module, and a control unit that includes a current source and bandgap voltage generating circuit to maintain stable output voltage by selectively charging or discharging the storage capacitor and providing additional current through a transistor when the loading current is high.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switching-capacitor regulator design is used, then device complexity is kept simple, but output voltage stability deteriorates under over-loading current
Solution Approach 1:
The regulator is divided into two operational modes: a first mode for normal loading current where the storage capacitor charges and discharges to regulate voltage, and a second mode for over-loading current where the current source activates to provide additional current. This segmentation allows the system to handle different loading conditions with appropriate mechanisms, improving output voltage stability under over-loading without requiring complete redesign for all conditions.
Solution Approach 2:
The regulator dynamically switches between two operational modes based on the loading current level. The control unit detects the loading condition and activates the current source when over-loading is detected, transitioning from a capacitor-based regulation mode to a hybrid capacitor-current source mode. This dynamic adaptation allows the system to maintain output voltage stability across varying load conditions while keeping the base design relatively simple.
2Productivity
If maximum current provision is limited in conventional design, then device complexity remains low, but productivity decreases under high loading current
Solution Approach 1:
A storage capacitor is pre-charged to a first voltage level during normal operation. When over-loading current is detected, this pre-stored energy in the capacitor is rapidly discharged through the current source to provide the additional current needed. This preliminary charging action enables the system to respond quickly to over-loading conditions, increasing allowable loading current capability without requiring a completely higher-rated current source for all conditions.
Solution Approach 2:
The storage capacitor acts as an intermediary energy storage element between the power supply and the load. During normal operation, it stores energy; during over-loading, it releases stored energy through the current source to supplement the main power path. This intermediary capacitor allows the system to handle peak over-loading currents that exceed the continuous current capability of the main regulator components, effectively increasing productivity under high loading conditions.
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 solution ensures a stable output voltage even under over-loading conditions, minimizing voltage drops and maintaining system stability by providing an additional charging path, thus preventing system operations from being influenced by excessive loading currents.
Implementation Method 1
a storage capacitor, a switch module, a current source and a control unit... controlling the switch module to selectively charge or discharge the storage capacitor
Data Source
AI summary
A switching-capacitor regulator with a charge injection mode for a high loading current is used to generate an output voltage at an output node, where the switching-capacitor regulator includes a storage capacitor, a switch module, a current source and a control unit. The switch module is coupled between the storage capacitor, a first supply voltage, a second supply voltage and the output node. The current source is coupled to the output node, and is used for selectively providing a current to the output node. The control unit is coupled to the switch module and the output node, and is used for controlling the switch module to selectively charge or discharge the storage capacitor, and for controlling the current source to selectively provide the current to the output node, to adjust a voltage level of the output voltage