Adaptive Reference Voltage Circuit for Capacitor Leakage Control
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Solution Overview
Problem
Conventional reference voltage circuits face accuracy reduction due to varied leakage currents in capacitors, as they operate with a predetermined switching frequency, which is not adaptable to changing conditions.
Innovation Solution
A reference voltage circuit comprising a bandgap reference circuit, a switch device, a capacitor, and a controller that adjusts switching frequency based on the reduction speed of the capacitor's voltage, using a comparator and counter to determine the optimal switching frequency in different operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a predetermined switching frequency is used to update the capacitor voltage, then the circuit operation is simplified, but the reference voltage accuracy deteriorates due to varied leakage current
Solution Approach 1:
The switching frequency is changed from a fixed predetermined value to a dynamically adjustable parameter. The controller adapts the switching frequency based on detected leakage current conditions, allowing the system to optimize between accuracy and power consumption in real-time rather than being constrained by a static frequency setting
Solution Approach 2:
A feedback mechanism is introduced where the system monitors the capacitor voltage reduction (indicative of leakage current) and uses this information to adjust the switching frequency. The comparator detects voltage deviations and triggers frequency adjustment, creating a closed-loop control system that maintains accuracy despite varying leakage conditions
2Measurement precision
If the switching frequency is increased to maintain voltage accuracy, then the reference voltage accuracy improves, but the power consumption increases
Solution Approach 1:
The system dynamically adjusts switching frequency based on actual leakage current conditions rather than operating at a constantly high frequency. When leakage is low, the frequency is reduced to save power; when leakage increases, the frequency is raised to maintain accuracy, optimizing the trade-off between these two parameters
Solution Approach 2:
The switching frequency parameter is changed adaptively based on system conditions. The controller modifies this parameter in response to detected voltage reduction rates, allowing the system to transition between different operating points on the accuracy-power consumption trade-off curve rather than being fixed at a single point
3Use of energy by moving object
If the switching frequency is decreased to reduce power consumption, then the power consumption reduces, but the reference voltage accuracy deteriorates
Solution Approach 1:
Rather than using a statically low switching frequency, the system employs dynamic adjustment that allows the frequency to be lowered for power savings when conditions permit, while automatically increasing when accuracy requirements demand it. This creates an adaptive balance rather than a fixed compromise
Solution Approach 2:
The feedback loop monitors voltage accuracy and provides information to adjust frequency accordingly. When voltage deviation exceeds thresholds, the system responds by increasing frequency to restore accuracy, preventing the system from operating in an inaccurate state even at lower power consumption levels
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 adaptive approach effectively maintains the output voltage by adjusting the switching frequency according to leakage current conditions, enhancing accuracy and reducing power consumption.
Implementation Method 1
a bandgap reference circuit, a switch device, a capacitor, and a controller. The capacitor has a first terminal electrically connected to the bandgap reference circuit through the switch device
Implementation Method 2
the comparator is triggered to output a comparison signal to the controller in response to the reduction amount of voltage on the first terminal of the capacitor
Data Source
AI summary
A reference voltage circuit is disclosed. In the reference voltage circuit, a comparator compares a reference voltage and a voltage of a capacitor, so as to output a comparison signal; a controller checks conditions of the reference voltage and the leakage current based on the comparison signal; when a voltage of the capacitor is reduced too quickly, the controller adjusts a switching frequency of a switch device to effectively maintain the voltage of the capacitor.