Switched-Capacitor DC-DC Converter Adaptive Clock Frequency Control
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Solution Overview
Problem
Existing switched-capacitor DC-DC converters face challenges in reducing power consumption, especially under light loads, as their power consumption is often high due to fixed clock frequencies, which is critical for microprocessors and IoT applications.
Innovation Solution
A switched-capacitor DC-DC converter system that includes a latched comparator and a clock generating module, which adjusts the frequency of the clock signal based on the variation of the control signal, decreasing frequency under light loads and increasing it under heavy loads to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed clock frequency is used in the switched-capacitor DC-DC converter, then the converter can maintain stable operation, but the power consumption increases especially under light loads
Solution Approach 1:
The patent applies dynamics by making the clock frequency adjustable rather than fixed. The clock generating module dynamically changes the clock frequency based on load conditions detected by the control circuit. Under light loads, the frequency is reduced to lower power consumption, while under heavy loads, the frequency is increased to maintain stable operation and meet power delivery requirements.
Solution Approach 2:
The patent changes the clock frequency parameter based on operating conditions. The control circuit monitors the load current and adjusts the clock frequency accordingly - decreasing frequency when load current is below a threshold to reduce power consumption, and increasing frequency when load current exceeds the threshold to ensure stable operation.
2Use of energy by moving object
If the clock frequency is reduced to lower power consumption, then energy efficiency improves, but the converter's ability to respond to load changes deteriorates
Solution Approach 1:
The system dynamically adjusts clock frequency based on real-time load detection. When a load change is detected (current exceeds threshold), the clock frequency is immediately increased to ensure fast response and stable operation. When the load is light (current below threshold), the frequency is reduced to save power, creating an optimal balance between response speed and energy efficiency.
Solution Approach 2:
The control circuit implements feedback by continuously monitoring the output current and adjusting the clock frequency accordingly. The feedback mechanism ensures that when load conditions change, the system detects the change and responds by adjusting the clock frequency to maintain stable operation, thus preventing degradation of response capability.
3Adaptability or versatility
If the clock frequency is increased to improve response to load changes, then the converter's adaptability improves, but power consumption increases
Solution Approach 1:
The clock frequency is made dynamic and adjustable based on actual load conditions. The system adapts its operating frequency to match the demand - using high frequency only when necessary for heavy loads or transient conditions, and switching to low frequency during light load periods to minimize power consumption, thus achieving adaptability without excessive energy use.
Solution Approach 2:
The patent changes the clock frequency parameter adaptively based on load current magnitude. The control circuit compares the output current with a threshold and adjusts the frequency parameter accordingly, enabling the converter to adapt to different load conditions while avoiding unnecessary power consumption during light load operation.
Data Source
AI summary
Illustrated are a switched-capacitor DC-DC convertor and a control method thereof. The switched-capacitor DC-DC convertor includes a switched-capacitor circuit, a latched comparator and a clock generating module. The switched-capacitor circuit converts an input voltage into an output voltage through a phase switching operation. The latched comparator receives a clock signal, and compares the output voltage and a reference voltage according to the clock signal, to generate the control signal, which triggers a phase switching operation of the switched-capacitor circuit. The clock generating module generates the clock signal, and adjusts a frequency of the clock signal according to variation of the control signal.