Charge Pump Adiabaticity Control for Resistive Loss Reduction
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Solution Overview
Problem
Charge pumps experience energy losses due to resistive and capacitive losses, which are inversely proportional to switching frequency and directly proportional, respectively, making it challenging to optimize power conversion efficiency.
Innovation Solution
Implementing an adiabatic mode with high duty cycle and a non-adiabatic mode with low duty cycle, using a controller to selectively introduce a compensation capacitor to present a constant voltage, and adjusting the switching frequency based on sensor signals to minimize losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If adiabatic mode with high duty cycle is used to minimize resistive losses, then resistive energy loss decreases, but device complexity increases due to mode switching control
Solution Approach 1:
The charge pump system uses feedback from sensor inputs to automatically adjust its operating parameters without external intervention. The controller monitors operating conditions and self-regulates switching frequency and duty cycle to maintain optimal efficiency, reducing the need for complex external control circuitry.
Solution Approach 2:
The system incorporates sensor inputs that provide feedback to the controller about operating conditions such as load current and voltage levels. This feedback enables the controller to adjust switching parameters in real-time to optimize efficiency while managing the complexity through intelligent control algorithms.
2Productivity
If switching frequency is increased to improve power conversion speed, then productivity increases, but capacitive energy loss increases
Solution Approach 1:
The system dynamically adjusts switching frequency based on actual power conversion needs and load conditions. Rather than operating at a constantly high frequency, the controller modifies frequency to match demand, achieving high productivity when needed while minimizing capacitive losses during lower-demand periods.
Solution Approach 2:
The charge pump operates in alternating states (state one and state two) with configurable duty cycles. This periodic operation allows the system to achieve high average power conversion speed while managing peak currents and capacitive losses through controlled duty cycle variations.
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 approach maintains efficient operation across varying modes, reduces resistive losses, and adapts to different circuit configurations without preconfiguration, optimizing power conversion efficiency by switching between adiabatic and non-adiabatic modes based on duty cycles and switching frequencies.
Implementation Method 1
selectively introducing a compensation capacitor to present a substantially constant voltage
Implementation Method 2
resistive losses through the switches (i.e., through the resistors R in FIGS. 2A-B)... resistive energy losses in this equilibration are proportional to the time average of the square of the current passing between the capacitors
Implementation Method 3
capacitive losses in the switches, such that energy loss grows with the switching frequency... capacitive energy loss is approximately proportional to the square of the switching frequency
Data Source
AI summary
Operation of a charge pump is controlled to optimize power conversion efficiency by using an adiabatic mode with some operating characteristics and a non-adiabatic mode with other characteristics. The control is implemented by controlling a configurable circuit at the output of the charge pump.