Driver Circuitry Variable Boost Charge Pump Top-Up
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Solution Overview
Problem
Charge pump circuits experience inefficiencies and inaccuracies due to charge loss during charging and discharging cycles of the flying capacitor, leading to fluctuations in the power provided to the load.
Innovation Solution
The driver circuitry incorporates a variable boost stage with a controller that operates in multiple modes to control the connection of flying capacitors and input nodes, implementing a top-up cycle to restore charge and maintain desired voltage ranges, with the frequency of the duty cycle being greater than the charge top-up cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If charge pump circuits use flying capacitors for voltage conversion, then high efficiency (90-95%) is achieved, but charge loss occurs during charging and discharging cycles leading to power fluctuations
Solution Approach 1:
The controller performs preliminary charge top-up of the flying capacitor during idle periods or between operational cycles. By proactively restoring charge before significant depletion occurs, the system prevents power delivery inaccuracies while maintaining the high efficiency benefits of charge pump operation.
Solution Approach 2:
The controller monitors the charge state of the flying capacitor and adjusts the top-up cycle frequency and duty cycle accordingly. This feedback mechanism ensures charge is restored only when needed, minimizing unnecessary switching losses while maintaining stable power delivery to the load.
2Reliability
If the controller implements frequent charge top-up cycles, then charge loss is minimized and power accuracy is improved, but the complexity of control operations increases
Solution Approach 1:
The controller implements charge top-up at periodic intervals rather than continuously monitoring and adjusting. The top-up operation occurs at a lower frequency than the main switching duty cycle, creating a hierarchical control structure that simplifies implementation while maintaining power delivery accuracy.
Solution Approach 2:
The controller dynamically adjusts the top-up cycle parameters based on operational conditions. The top-up frequency and duration are modifiable according to load demands and charge depletion rates, allowing the system to optimize between simplicity and accuracy based on real-time conditions.
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 solution enhances the efficiency and accuracy of power delivery to the load by minimizing charge loss and maintaining stable voltage ranges, even with reactive or resistive loads, thereby improving the overall performance of the driver circuitry.
Implementation Method 1
Charge pump circuits are capable of high efficiencies, sometimes as high as 90-95%. Charge pumps typically use one or more switching devices to control the connection of one or more capacitors to voltage sources and to one another
Implementation Method 2
The switching device(s) are configured to control the charging and discharging of the flying capacitor in cycles to achieve the desired output voltage based on an input signal
Data Source
AI summary
Driver circuitry for driving a load based on an input signal, comprising: at least one variable boost stage comprising: first and second input nodes configured to receive a first voltage and a second voltage respectively; first and second flying capacitor nodes for connection to a flying capacitor therebetween; a network of switching paths for selectively connecting the first and second input nodes with the first and second flying capacitor nodes; an output stage for selectively connecting a driver output node to each of the first and second flying capacitor nodes; and a controller operable in a first boost mode to: control the output stage to selectively connect the driver output node to the first flying capacitor node; control the network of switching paths to switch connection of the second flying capacitor node between the first and second input nodes at a controlled duty cycle; and in a first charge top-up cycle, control the network of switching paths to connect the first input node to the first flying capacitor node during a phase of the controlled duty cycle in which the first input node is connected to the second flying capacitor node; wherein the frequency of the controlled duty cycle is greater than the frequency of the charge top-up cycle.