Variable Frequency Charge Pump for Low Noise Power
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Solution Overview
Problem
Charge pumps generate excessive noise, which is coupled into source and output supplies, and are weak in driving large load currents, making them unsuitable for applications requiring low noise and high power efficiency.
Innovation Solution
A variable frequency charge pump circuit that dynamically adjusts its clock frequency based on load conditions, increasing frequency during load changes to enhance output current and reducing frequency when the load is settled to minimize noise, and incorporates randomization in the clock signal to spread spurious signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If charge pump operates at high frequency to drive large load currents, then output current capability is improved, but noise injection into source and output supplies increases
Solution Approach 1:
The charge pump operates with dynamically adjustable frequency rather than a fixed frequency. The control circuit monitors load conditions and adjusts the operating frequency in real-time, increasing frequency when high current is needed and decreasing frequency when load is light, thereby adapting the noise profile to actual operational requirements.
Solution Approach 2:
The operating frequency parameter is changed based on load conditions. By varying the frequency parameter dynamically, the system optimizes the trade-off between output current capability and noise generation, operating at high frequency only when necessary to drive large loads and at low frequency during light load conditions to minimize noise injection.
2Object-generated harmful factors
If charge pump operates at low frequency to reduce noise, then noise injection is reduced, but ability to drive large load currents decreases
Solution Approach 1:
The system dynamically adjusts frequency based on actual load demands rather than operating at a static low frequency. The control circuit detects when high current is required and temporarily increases frequency to meet the demand, then returns to low frequency when the demand subsides, ensuring both noise reduction and adequate current capability.
Solution Approach 2:
The frequency parameter is varied according to load conditions. During light load periods, the parameter remains at low values to minimize noise. When large load currents are required, the parameter is increased to provide sufficient current drive capability, thus optimizing performance across varying operating conditions.
3Power
If charge pump uses fixed high frequency operation, then output current capability is maintained, but power consumption increases and electrical quietness is lost
Solution Approach 1:
The charge pump transitions from fixed frequency operation to dynamic frequency adjustment. The control circuit monitors actual load requirements and adjusts the operating frequency accordingly, reducing frequency and thus power consumption during light load conditions while maintaining high frequency capability when full current drive is required.
Solution Approach 2:
The operating frequency parameter is changed based on load conditions to optimize power efficiency. During light load operation, the parameter is reduced to minimize power consumption. When high current capability is needed, the parameter is increased to maintain performance, thus achieving a balance between power efficiency and current capability.
4Use of energy by moving object
If charge pump uses fixed low frequency operation, then power consumption is reduced, but output current capability and responsiveness to load changes decrease
Solution Approach 1:
The system employs dynamic frequency adjustment rather than fixed low frequency operation. The control circuit detects load changes and increases frequency in response to demand, ensuring adequate current capability and responsiveness when needed, then reduces frequency during light load periods to minimize power consumption.
Solution Approach 2:
The frequency parameter is varied according to actual load requirements. During light load conditions, the parameter remains at low values to minimize power consumption. When load demands increase, the parameter is increased to provide sufficient current capability and improve responsiveness, thus optimizing the trade-off between power efficiency and performance.
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
The solution reduces noise injection into source and output supplies, providing optimal power when needed and maintaining electrical quietness at other times, while operating at lower power levels, particularly beneficial for battery-powered systems.
Implementation Method 1
charge pump, which obtains energy for the output voltage primarily by means of capacitive transfer from the source to the output
Data Source
AI summary
A charge pump circuit that utilizes a sensing circuit for determining the current loading or status of the output supply generated by the charge pump circuit to determine a corresponding frequency for a variable rate clock for the charge pump circuit. When a current load is present, the clock frequency automatically ramps up to a relatively high level to increase the output current of the charge pump circuit. When the current load is removed and the supply is settled out, the clock frequency is automatically reduced to a relatively quieter level and the charge pump circuitry operates at a lower power level. Accordingly, the charge pump circuit is only noisy when it has to be, thus providing optimal power when required and being electrically quiet and operating at lower power at all other times.