Charge Pump Parasitic Capacitance Energy Reuse Circuit
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Solution Overview
Problem
Charge pumps in booster circuits, such as those used in liquid crystal displays, incur extra power consumption due to consistent charging and discharging of parasitic capacitance during voltage boosting.
Innovation Solution
A method and circuit for reusing electrical energy from parasitic capacitance after the boosting phase, involving an energy storage unit and switches to control energy retrieval and reuse for internal circuits, reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If charge pump performs boosting operation, then output voltage is increased, but power consumption increases due to charging and discharging parasitic capacitance
Solution Approach 1:
The patent converts the harmful parasitic capacitance that causes power consumption into a useful energy source. During the reusing phase, the parasitic capacitance is charged from the output capacitor, and this stored energy is then used to supply the internal circuit, transforming what was previously wasted energy into a beneficial power source.
Solution Approach 2:
The patent recovers energy that would otherwise be discarded. Instead of allowing the parasitic capacitance to discharge uselessly to ground, the circuit captures and stores its energy in an energy storage unit during the reusing phase, then reuses this energy to power internal circuits, effectively recovering what would have been waste.
2Power
If parasitic capacitance is consistently charged and discharged during boosting, then voltage boosting is achieved, but extra power consumption occurs
Solution Approach 1:
The patent transforms the energy loss from parasitic capacitance charging/discharging into useful energy. By adding the reusing phase where parasitic capacitance charges the energy storage unit, the previously lost energy is converted into a beneficial resource that powers internal circuits.
Solution Approach 2:
The patent extends the useful action of energy utilization beyond the boosting phase. By implementing a reusing phase that continuously captures and stores energy from parasitic capacitance, the system maintains continuous useful energy action rather than allowing energy to be wasted during the boosting operation.
3Use of energy by moving object
If energy retrieval circuit is added to reuse parasitic capacitance energy, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent merges the energy retrieval function with the existing charge pump structure. The reusing phase is integrated into the existing boosting operation by utilizing the same output capacitor and parasitic capacitance, combining multiple functions (boosting and energy recovery) into a unified circuit operation rather than adding completely separate systems.
Solution Approach 2:
The patent uses periodic action by implementing a reusing phase that alternates with the boosting phase. The switch periodically connects the parasitic capacitance to charge the energy storage unit during the reusing phase, creating a rhythmic pattern of energy capture that reduces overall power consumption without requiring continuous complex circuitry.
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 effectively retrieves and reuses energy from parasitic capacitance, thereby reducing power consumption in charge pumps and enhancing efficiency.
Implementation Method 1
Each charge pump comprises a parasitic capacitance and an output capacitor for performing charging in a charging phase and performing boosting in a boosting phase
Data Source
AI summary
The present disclosure provides a method of reusing electrical energy for a charge pump. The method comprises operating in a reusing phase after a boosting phase is completed; retrieving energy of parasitic capacitance in the reusing phase; and reusing the energy of the parasitic capacitance for an internal circuit.