Charge Pump Control Circuit Dynamic Frequency Adjustment
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Solution Overview
Problem
Conventional charge pump circuits face a trade-off between efficiency and driving ability due to fixed frequency settings in the ring oscillator, leading to inefficiencies when output voltage varies, and inability to maintain required clock signals during load changes, resulting in output voltage drops.
Innovation Solution
A control circuit with a load status detection unit and ring oscillator that adjusts the clock signal frequency based on output voltage variations, using a first control signal and adjustment signal to enable the clock signal at optimal times, ensuring both efficiency and driving ability are maintained by varying operation frequency according to load status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the frequency of the clock signal is increased to improve driving capacity, then the driving capacity of the charge pump circuit is improved, but the efficiency of the charge pump circuit decreases
Solution Approach 1:
The patent implements dynamic frequency adjustment of the clock signal based on load status detection. The control circuit monitors the charge pump circuit's operating conditions and dynamically changes the clock frequency accordingly - using higher frequencies when load demands more driving capacity and lower frequencies when efficiency is prioritized, thus resolving the fixed frequency trade-off between driving capacity and efficiency
Solution Approach 2:
The patent changes the frequency parameter of the clock signal based on detected load status. By adjusting this critical parameter according to actual operating conditions, the system can optimize the balance between driving capacity and efficiency, avoiding the fixed frequency limitation of conventional designs
2Loss of energy
If the frequency of the clock signal is decreased to improve efficiency, then the efficiency of the charge pump circuit is improved, but the driving capacity of the charge pump circuit worsens
Solution Approach 1:
The control circuit dynamically adjusts the clock frequency based on real-time load status detection. When efficiency is prioritized (light load conditions), the system uses lower frequencies; when driving capacity is needed (heavy load conditions), the system switches to higher frequencies, thus dynamically resolving the efficiency-capacity trade-off
3Device complexity
If a fixed frequency is used in the ring oscillator, then the circuit design is simplified, but the circuit cannot adapt to load variations, causing output voltage drops
Solution Approach 1:
The patent introduces a feedback mechanism where the control circuit continuously monitors the charge pump circuit's output and load status, then adjusts the clock frequency accordingly. This feedback loop enables the system to adapt to load variations and prevent output voltage drops, while the adjustment logic maintains reasonable circuit complexity
4Stability of the object's composition
If the ring oscillator switches frequency to maintain output voltage level, then the output voltage stability is improved, but the efficiency of the charge pump circuit decreases due to continuous switching
Solution Approach 1:
The control circuit performs preliminary detection of load status changes and proactively adjusts the clock frequency before significant output voltage fluctuations occur. This preliminary action prevents the need for continuous reactive switching, thereby maintaining output voltage stability while avoiding the efficiency penalties associated with frequent frequency switching
Data Source
AI summary
A control circuit of a charge pump circuit is disclosed, which includes a ring oscillator and a load status detection unit. The ring oscillator herein is for producing a clock signal and adjusting the frequency of the clock signal according to a first control signal, and stopping generating the clock signal according to an adjustment signal. The load status detection unit is for producing the first control signal and determining a time point to enable the first control signal according to the voltage drop variation of an output voltage of the charge pump circuit and the adjustment signal, wherein the pulse width of the adjustment signal gets narrower with a smaller drop in amplitude of the output voltage value.